Attachment 342160 Details for Bug 185787 – Addressed comments.

[patch] Addressed comments.

GTKWPE-Implement-MediaStream-API.patch (text/plain), 146.74 KB, created by Thibault Saunier on 2018-06-07 07:47:43 PDT

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Creator: Thibault Saunier

Created: 2018-06-07 07:47:43 PDT

Size: 146.74 KB

patch

obsolete

>From a75326f1ffd8eead7d3c6df227a7a776f720024b Mon Sep 17 00:00:00 2001
>From: "Alejandro G. Castro" <alex@igalia.com>
>Date: Thu, 24 May 2018 12:55:00 +0200
>Subject: [PATCH xserver] [GTK][WPE]: Implement MediaStream API
>
>https://bugs.webkit.org/show_bug.cgi?id=185787
>---
> LayoutTests/ChangeLog                         |  11 +
> LayoutTests/platform/gtk/TestExpectations     |  33 +-
> Source/WebCore/ChangeLog                      | 117 ++++
> Source/WebCore/PlatformGTK.cmake              |   2 +
> Source/WebCore/platform/GStreamer.cmake       |  16 +
> .../platform/audio/AudioStreamDescription.h   |   1 +
> .../platform/audio/PlatformAudioData.h        |   1 +
> .../graphics/gstreamer/GStreamerCommon.cpp    |  47 ++
> .../graphics/gstreamer/GStreamerCommon.h      |   3 +
> .../gstreamer/MediaPlayerPrivateGStreamer.cpp |  63 ++-
> .../gstreamer/MediaPlayerPrivateGStreamer.h   |   7 +-
> .../MediaPlayerPrivateGStreamerBase.cpp       |   7 +
> .../gstreamer/VideoTrackPrivateGStreamer.cpp  |   8 +
> .../mediastream/RealtimeMediaSource.h         |   2 +-
> .../mediastream/RealtimeMediaSourceCenter.cpp |   7 -
> .../gstreamer/GStreamerAudioCaptureSource.cpp | 202 +++++++
> .../gstreamer/GStreamerAudioCaptureSource.h   |  65 +++
> .../gstreamer/GStreamerAudioCapturer.cpp      |  73 +++
> .../gstreamer/GStreamerAudioCapturer.h        |  43 ++
> .../gstreamer/GStreamerAudioData.h            |  59 ++
> .../GStreamerAudioStreamDescription.h         | 105 ++++
> .../gstreamer/GStreamerCaptureDevice.h        |  50 ++
> .../GStreamerCaptureDeviceManager.cpp         | 134 +++++
> .../gstreamer/GStreamerCaptureDeviceManager.h |  81 +++
> .../gstreamer/GStreamerCapturer.cpp           | 198 +++++++
> .../mediastream/gstreamer/GStreamerCapturer.h |  72 +++
> .../gstreamer/GStreamerMediaStreamSource.cpp  | 531 ++++++++++++++++++
> .../gstreamer/GStreamerMediaStreamSource.h    |  46 ++
> .../gstreamer/GStreamerVideoCaptureSource.cpp | 270 +++++++++
> .../gstreamer/GStreamerVideoCaptureSource.h   |  64 +++
> .../gstreamer/GStreamerVideoCapturer.cpp      | 104 ++++
> .../gstreamer/GStreamerVideoCapturer.h        |  46 ++
> .../MockGStreamerAudioCaptureSource.cpp       | 106 ++++
> .../MockGStreamerAudioCaptureSource.h         |  51 ++
> .../MockGStreamerVideoCaptureSource.cpp       | 146 +++++
> .../MockGStreamerVideoCaptureSource.h         |  56 ++
> .../RealtimeMediaSourceCenterLibWebRTC.cpp    |  91 +++
> .../RealtimeMediaSourceCenterLibWebRTC.h      |  68 +++
> .../platform/mock/MockRealtimeAudioSource.cpp |   2 +-
> .../platform/mock/MockRealtimeVideoSource.cpp |   2 +-
> Tools/ChangeLog                               |  12 +
> Tools/Scripts/webkitpy/style/checker.py       |   2 +
> Tools/gstreamer/jhbuild.modules               |   4 +-
> ...REAM_COLLECTION-on-EVENT_STREAM_COLL.patch |  33 ++
> 44 files changed, 2998 insertions(+), 43 deletions(-)
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCaptureSource.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCaptureSource.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCapturer.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCapturer.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioData.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioStreamDescription.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDevice.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerCapturer.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerCapturer.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.h
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.cpp
> create mode 100644 Source/WebCore/platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.h
> create mode 100644 Tools/gstreamer/patches/gst-plugins-base-0001-parsebin-Post-STREAM_COLLECTION-on-EVENT_STREAM_COLL.patch
>
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index 832cf6b825d..7bcbf4f6d6f 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,14 @@
>+2018-05-18  Thibault Saunier  <tsaunier@igalia.com>
>+
>+        [GTK][WPE] Start implementing MediaStream API
>+        https://bugs.webkit.org/show_bug.cgi?id=185787
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * platform/gtk/TestExpectations: Reactivate MediaStream tests and enable all tests
>+        related to the mediaDevice.enumerateDevices and MediaStream (not RTCPeerConnection nor
>+        webaudio).
>+
> 2018-06-06  Youenn Fablet  <youenn@apple.com>
> 
>         HTTP Header values validation is too strict
>diff --git a/LayoutTests/platform/gtk/TestExpectations b/LayoutTests/platform/gtk/TestExpectations
>index a7e67477d01..59752370dce 100644
>--- a/LayoutTests/platform/gtk/TestExpectations
>+++ b/LayoutTests/platform/gtk/TestExpectations
>@@ -572,40 +572,31 @@ webkit.org/b/99036 fast/shadow-dom/pointerlockelement-in-slot.html [ Skip ]
> webkit.org/b/85211 ietestcenter/css3/flexbox/flexbox-align-stretch-001.htm [ ImageOnlyFailure ]
> webkit.org/b/85212 ietestcenter/css3/flexbox/flexbox-layout-002.htm [ ImageOnlyFailure ]
> 
>-# Skipping until backend is implemented
>-fast/mediastream [ Skip ]
> webrtc [ Skip ]
> imported/w3c/web-platform-tests/webrtc/ [ Skip ]
> http/tests/webrtc [ Skip ]
> # The MediaStream implementation is also still not completed
> webkit.org/b/79203 fast/mediastream/mock-media-source-webaudio.html [ Timeout ]
> webkit.org/b/79203 fast/mediastream/getUserMedia-webaudio.html [ Failure ]
>-webkit.org/b/79203 fast/mediastream/mock-media-source.html [ Failure ]
>-webkit.org/b/79203 fast/mediastream/MediaStream-video-element-track-stop.html [ Pass Crash ]
>+webkit.org/b/79203 fast/mediastream/MediaStream-video-element-track-stop.html [ Timeout ]
> webkit.org/b/79203 fast/mediastream/RTCPeerConnection-dtmf.html [ Timeout ]
> webkit.org/b/79203 fast/mediastream/RTCPeerConnection-icecandidate-event.html [ Failure Crash ]
>+webkit.org/b/79203 fast/mediastream/RTCPeerConnection-media-setup-two-dialogs.html [ Failure Crash ]
> webkit.org/b/79203 fast/mediastream/RTCRtpSender-replaceTrack.html [ Failure ]
> # Crash is webkit.org/b/184292
> webkit.org/b/79203 fast/mediastream/RTCPeerConnection-addIceCandidate.html [ Failure Pass Crash ]
>-webkit.org/b/79203 fast/mediastream/RTCPeerConnection-closed-state.html [ Timeout ]
>-webkit.org/b/79203 fast/mediastream/RTCPeerConnection-ice.html [ Timeout ]
>-webkit.org/b/79203 fast/mediastream/RTCPeerConnection-iceconnectionstatechange-event.html [ Timeout ]
>+webkit.org/b/79203 fast/mediastream/RTCPeerConnection-iceconnectionstatechange-event.html [ Failure Timeout ]
>+webkit.org/b/79203 fast/mediastream/RTCPeerConnection-ice.html [ Failure Timeout ]
> webkit.org/b/79203 fast/mediastream/RTCPeerConnection-inspect-answer.html [ Failure ]
> webkit.org/b/79203 fast/mediastream/RTCPeerConnection-inspect-offer-bundlePolicy-bundle-only.html [ Failure ]
> webkit.org/b/79203 fast/mediastream/RTCPeerConnection-inspect-offer.html [ Failure ]
> webkit.org/b/79203 fast/mediastream/RTCPeerConnection-legacy-stream-based-api.html [ Failure ]
>+webkit.org/b/79203 fast/mediastream/RTCPeerConnection-media-setup-callbacks-single-dialog.html [ Crash Failure ]
> webkit.org/b/79203 webaudio/mediastreamaudiosourcenode.html [ Failure ]
>-webkit.org/b/79203 fast/mediastream/MediaStream-video-element-displays-buffer.html [ Crash ]
>-webkit.org/b/79203 fast/mediastream/MediaStream-video-element-video-tracks-disabled-then-enabled.html [ Crash ]
>-webkit.org/b/79203 fast/mediastream/MediaStream-video-element.html [ Crash ]
>-webkit.org/b/79203 fast/mediastream/apply-constraints-advanced.html [ Crash ]
>+webkit.org/b/79203 fast/mediastream/MediaStream-video-element-video-tracks-disabled-then-enabled.html [ Timeout Failure ]
>+webkit.org/b/79203 fast/mediastream/MediaStream-video-element-displays-buffer.html [ Failure ]
> webkit.org/b/79203 http/tests/media/media-stream/getusermedia-with-canvas.html [ Crash ]
>-webkit.org/b/79203 fast/mediastream/MediaStream-MediaElement-setObject-null.html [ Timeout ]
> webkit.org/b/79203 fast/mediastream/RTCPeerConnection-stats.html [ Timeout ]
>-webkit.org/b/79203 fast/mediastream/captureStream/canvas2d-heavy-drawing.html [ Timeout ]
>-webkit.org/b/79203 fast/mediastream/get-user-media-on-loadedmetadata.html [ Timeout ]
>-webkit.org/b/79203 fast/mediastream/local-audio-playing-event.html [ Timeout ]
>-webkit.org/b/79203 fast/mediastream/media-stream-track-source-failure.html [ Timeout ]
> webkit.org/b/79203 imported/w3c/web-platform-tests/mediacapture-streams/MediaStream-MediaElement-preload-none.https.html [ Failure ]
> webkit.org/b/79203 imported/w3c/web-platform-tests/mediacapture-streams/MediaStreamTrack-end-manual.https.html [ Failure ]
> webkit.org/b/151344 fast/mediastream/MediaStream-add-ended-tracks.html [ Timeout ]
>@@ -616,6 +607,9 @@ webkit.org/b/173257 fast/mediastream/getUserMedia-grant-persistency3.html [ Pass
> 
> # Canvas captureStream support is not implemented
> webkit.org/b/169811 fast/mediacapturefromelement [ Skip ]
>+webkit.org/b/169811 fast/mediastream/captureStream/ [ Failure ]
>+webkit.org/b/169811 fast/mediastream/captureStream/canvas2d.html [ Crash Timeout ]
>+webkit.org/b/169811 fast/mediastream/captureStream/canvas3d.html [ Crash Timeout ]
> 
> # Requires Resolution Media Query support
> webkit.org/b/100137 fast/media/mq-resolution.html [ Failure ]
>@@ -1241,25 +1235,18 @@ webkit.org/b/131546 media/track/track-in-band.html [ Crash Timeout Failure ]
> 
> webkit.org/b/163782 media/video-played-ranges-1.html [ Crash Pass ]
> 
>-webkit.org/b/169811 fast/mediastream/captureStream/canvas2d.html [ Crash Timeout ]
>-webkit.org/b/169811 fast/mediastream/captureStream/canvas3d.html [ Crash Timeout ]
>-
> webkit.org/b/172281 accessibility/insert-children-assert.html [ Crash ]
> 
> webkit.org/b/172955 media/video-preload.html [ Crash Pass ]
> 
> webkit.org/b/175575 imported/w3c/web-platform-tests/html/semantics/embedded-content/media-elements/ready-states/autoplay-with-slow-text-tracks.html [ Crash Pass ]
> 
>-webkit.org/b/176801 fast/mediastream/apply-constraints-audio.html [ Crash ]
> webkit.org/b/176801 fast/mediastream/argument-types.html [ Crash Pass ]
> 
> webkit.org/b/176803 http/tests/local/blob/send-hybrid-blob-using-open-panel.html [ Crash ]
> 
>-webkit.org/b/176856 fast/mediastream/apply-constraints-video.html [ Crash ]
>-
> # See also webkit.org/b/141699
> webkit.org/b/177534 fast/attachment/attachment-respects-css-size.html [ Crash ImageOnlyFailure ]
>-webkit.org/b/177535 fast/mediastream/media-device-info.html [ Crash Pass ]
> # See also webkit.org/b/163528 Threaded compositor failures caused by one of r203496, r203497, or r203498
> webkit.org/b/177536 media/video-object-fit.html [ Crash ImageOnlyFailure ]
> 
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 292985617e1..1696d344bfe 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,120 @@
>+2018-05-30  Thibault Saunier  <tsaunier@igalia.com> and Alejandro G. Castro  <alex@igalia.com>
>+
>+        [GTK][WPE] Start implementing MediaStream API
>+        https://bugs.webkit.org/show_bug.cgi?id=185787
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        We are adding all the required classes to make the
>+        MediaStream API work, that means our own RealtimeMediaSourceCenterLibWebRTC
>+        for the platform, the GStreamerCaptureDeviceManager, the audio/video capturers
>+        and their respective audio/video sources as well as a dedicated GStreamer Source
>+        that adds support for using MediaStream stream inside playbin3.
>+        We are using the GstDeviceMonitor to list devices on the devices.
>+
>+        Enable mediastream tests.
>+
>+        * platform/GStreamer.cmake: Added the new files to the compilation.
>+        * platform/audio/AudioStreamDescription.h: Added new GStreamer type.
>+        * platform/audio/PlatformAudioData.h: Added new GStreamer type for
>+        the GStreamerAudioData class.
>+        * platform/graphics/gstreamer/GStreamerCommon.cpp:
>+        (WebCore::simpleBusMessageCallback): This function and the next
>+        one help us to connect a monitoring callback to a pipeline for
>+        debugging.
>+        (WebCore::connectSimpleBusMessageCallback): Ditto.
>+        * platform/graphics/gstreamer/GStreamerCommon.h: Ditto
>+        * platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:
>+        (WebCore::MediaPlayerPrivateGStreamer::load): Make use of the loadFull() method.
>+        (WebCore::MediaPlayerPrivateGStreamer::loadFull): Very similar to load()
>+        but allows specifying what pipeline type to use (null to let the function determine
>+        which one should be used). This is required as we force to always use playbin3 for the
>+        mediastream source as it relies on the GstStream API.
>+        (WebCore::MediaPlayerPrivateGStreamer::playbackPosition const): Style fix.
>+        (WebCore::MediaPlayerPrivateGStreamer::naturalSize const): Added, use MediaStream specific information if available.
>+        (WebCore::MediaPlayerPrivateGStreamer::updateTracks): Some style fixes.
>+        (WebCore::MediaPlayerPrivateGStreamer::handleMessage): Enhance dotfiles names.
>+        (WebCore::MediaPlayerPrivateGStreamer::processTableOfContentsEntry): Minor formatting fix.
>+        (WebCore::MediaPlayerPrivateGStreamer::sourceSetup): Set MediaStream on WebKitMediaStreamSource when setting it up.
>+        (WebCore::MediaPlayerPrivateGStreamer::supportsType): Advertise that we support MediaStream if support is built.
>+        (WebCore::MediaPlayerPrivateGStreamer::createGSTPlayBin): Make sure playbin3 is forced when loading a MediaStream.
>+        * platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h: Add a reference to the MediaStream object and declare loadFull and naturalSize override.
>+        * platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp:
>+        (WebCore::registerWebKitGStreamerElements): Register the new MediaStreamSrc element.
>+        * platform/graphics/gstreamer/VideoTrackPrivateGStreamer.cpp:
>+        (WebCore::VideoTrackPrivateGStreamer::VideoTrackPrivateGStreamer): Make sure that MediaStream MAIN tracks are selected by default. We have no way to do it in MediaStreamSrc now as the GstStreamCollection is recreated by parsebin.
>+        * platform/mediastream/RealtimeMediaSource.h: Make CaptureFailed a virtual method as in our mocks we require need to make
>+        * platform/mediastream/RealtimeMediaSourceCenter.cpp:
>+        (WebCore::RealtimeMediaSourceCenter::singleton): Remove the code
>+        used for compilation for the platform when we do not have a
>+        RealtimeMediaSourceCenterLibWebRTC. Now we return the proper class
>+        for the platform.
>+        * platform/mediastream/gstreamer/GStreamerAudioCaptureSource.cpp:
>+        Added class representing the RealtimeMediaSource for the Audio
>+        with GStreamer.
>+        * platform/mediastream/gstreamer/GStreamerAudioCaptureSource.h:
>+        Ditto.
>+        * platform/mediastream/gstreamer/GStreamerAudioCapturer.cpp: Added
>+        this class that represents the GStreamer pipeline that captures
>+        audio from the system devices, it inherits from GStreamerCapturer.
>+        * platform/mediastream/gstreamer/GStreamerAudioCapturer.h: Dito.
>+        * platform/mediastream/gstreamer/GStreamerAudioData.h: Added this
>+        class implementing PlatformAudioData for the GStreamer platform,
>+        used to pass the samples information.
>+        * platform/mediastream/gstreamer/GStreamerAudioStreamDescription.h:
>+        Added this class implementing AudioStreamDescription to export the
>+        information about the audio stream to libwebrtc.
>+        * platform/mediastream/gstreamer/GStreamerCaptureDevice.h: Added
>+        this base class for the audio and video capturing devices, it
>+        implements general WebKit CaptureDevice class.
>+        * platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.cpp:
>+        Added this class that implements the system monitor to get the
>+        list of available devices in the system. It uses GstDeviceMonitor
>+        to handle the operation. It uses two singleton device managers one
>+        for audio and another one for video, as required by the
>+        RealtimeMediaSourceCenter design.
>+        * platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.h: Ditto.
>+        * platform/mediastream/gstreamer/GStreamerCapturer.cpp: Added this
>+        base class representing how GStreamer captures the media from the
>+        input devices in the system. Two classes inherit from this one to
>+        capture audio and video. It setups the GStreamer pipeline and adds
>+        functions to control it.
>+        * platform/mediastream/gstreamer/GStreamerCapturer.h: Ditto.
>+        * platform/mediastream/gstreamer/GStreamerMediaStreamSource.cpp: Added.
>+        Implements a subclass of GstBin as a source element that will contain several
>+        GstAppSrc, basically one per MediaStreamTrackPrivate of the MediaStreamPrivate
>+        passed in parameter. It adds Observers on the MediaStreamTracks and
>+        pushes the data to the sources as required. The element implements the GstURIHandler
>+        interface so it can be used in playbin. The MediaPlayerPrivateGStreamer is responsible
>+        for passing the MediaStreamPrivate object to the source when required.
>+        (WebCore::webkitMediaStreamSrcPadProbeCb): Event probe that fixes stream_start events (setting the ID etc)
>+        and finally add src pads to the pipeline.
>+        * platform/mediastream/gstreamer/GStreamerMediaStreamSource.h: Ditto.
>+        * platform/mediastream/gstreamer/GStreamerVideoCaptureSource.cpp:
>+        Added this RealtimeMediaSource representing the source of the
>+        video data for the GStreamer platform. It handles the settings and
>+        capabilities of the source and creates the capturer used to
>+        control the operation of the stream.
>+        * platform/mediastream/gstreamer/GStreamerVideoCaptureSource.h: Ditto.
>+        * platform/mediastream/gstreamer/GStreamerVideoCapturer.cpp: Added
>+        this class that inherits from the GStreamerCapturer and controls
>+        the GStreamer pipelines of the video streams of the system.
>+        * platform/mediastream/gstreamer/GStreamerVideoCapturer.h: Ditto.
>+        * platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.cpp: Added. Implementation of a Mock capturer for audio stream.
>+        Subclasses GStreamerAudioCapturer and wraps a MockRealtimeAudioSource so that the behaviour is the same a MockRealtimeAudioSource
>+        but still the GStreamer implementation code paths are tested.
>+        * platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.h: Ditto.
>+        * platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.cpp: Added. Implementation of a Mock capturer for video stream.
>+        Subclasses GStreamerVideoCapturer and wraps a MockRealtimeVideoSource so that the behaviour is the same a MockRealtimeVideoSource
>+        but still the GStreamer implementation code paths are tested.
>+        * platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.h: Ditto.
>+        * platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.cpp:
>+        Added this class that implements the key RealtimeMediaSourceCenter
>+        functions to configure the base class for the platform, using the
>+        other GStreamer classes.
>+        * platform/mock/MockRealtimeAudioSource.cpp: Do not build ::create if GStreamer implementation is built
>+        * platform/mock/MockRealtimeVideoSource.cpp: Do not build ::create if GStreamer implementation is built
>+
> 2018-06-07  Thibault Saunier  <tsaunier@igalia.com>
> 
>         [GStreamer] Fix the way GstStreamCollection is handled
>diff --git a/Source/WebCore/PlatformGTK.cmake b/Source/WebCore/PlatformGTK.cmake
>index 823c77ddb21..c2d4cae0f60 100644
>--- a/Source/WebCore/PlatformGTK.cmake
>+++ b/Source/WebCore/PlatformGTK.cmake
>@@ -24,12 +24,14 @@ list(APPEND WebCore_INCLUDE_DIRECTORIES
>     "${WEBCORE_DIR}/platform/gtk"
>     "${WEBCORE_DIR}/platform/graphics/egl"
>     "${WEBCORE_DIR}/platform/graphics/glx"
>+    "${WEBCORE_DIR}/platform/graphics/gstreamer"
>     "${WEBCORE_DIR}/platform/graphics/gtk"
>     "${WEBCORE_DIR}/platform/graphics/opengl"
>     "${WEBCORE_DIR}/platform/graphics/opentype"
>     "${WEBCORE_DIR}/platform/graphics/wayland"
>     "${WEBCORE_DIR}/platform/graphics/x11"
>     "${WEBCORE_DIR}/platform/mediastream/gtk"
>+    "${WEBCORE_DIR}/platform/mediastream/gstreamer"
>     "${WEBCORE_DIR}/platform/mock/mediasource"
>     "${WEBCORE_DIR}/platform/network/gtk"
>     "${WEBCORE_DIR}/platform/network/soup"
>diff --git a/Source/WebCore/platform/GStreamer.cmake b/Source/WebCore/platform/GStreamer.cmake
>index 3d5a6e0025a..333f1d65bff 100644
>--- a/Source/WebCore/platform/GStreamer.cmake
>+++ b/Source/WebCore/platform/GStreamer.cmake
>@@ -33,6 +33,22 @@ if (ENABLE_VIDEO OR ENABLE_WEB_AUDIO)
>         platform/graphics/gstreamer/mse/PlaybackPipeline.cpp
>         platform/graphics/gstreamer/mse/SourceBufferPrivateGStreamer.cpp
>         platform/graphics/gstreamer/mse/WebKitMediaSourceGStreamer.cpp
>+
>+        platform/mediastream/gstreamer/GStreamerAudioCaptureSource.cpp
>+        platform/mediastream/gstreamer/GStreamerAudioCapturer.cpp
>+        platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.cpp
>+        platform/mediastream/gstreamer/GStreamerCapturer.cpp
>+        platform/mediastream/gstreamer/GStreamerMediaStreamSource.cpp
>+        platform/mediastream/gstreamer/GStreamerVideoCaptureSource.cpp
>+        platform/mediastream/gstreamer/GStreamerVideoCapturer.cpp
>+        platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.cpp
>+        platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.cpp
>+        platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.cpp
>+
>+        platform/mock/MockRealtimeAudioSource.cpp
>+        platform/mock/MockRealtimeMediaSource.cpp
>+        platform/mock/MockRealtimeMediaSourceCenter.cpp
>+        platform/mock/MockRealtimeVideoSource.cpp
>     )
> 
>     list(APPEND WebCore_SYSTEM_INCLUDE_DIRECTORIES
>diff --git a/Source/WebCore/platform/audio/AudioStreamDescription.h b/Source/WebCore/platform/audio/AudioStreamDescription.h
>index e440dc90a3e..2ba585c9c05 100644
>--- a/Source/WebCore/platform/audio/AudioStreamDescription.h
>+++ b/Source/WebCore/platform/audio/AudioStreamDescription.h
>@@ -35,6 +35,7 @@ struct PlatformDescription {
>     enum {
>         None,
>         CAAudioStreamBasicType,
>+        GStreamerAudioStreamDescription,
>     } type;
>     Variant<std::nullptr_t, const AudioStreamBasicDescription*> description;
> };
>diff --git a/Source/WebCore/platform/audio/PlatformAudioData.h b/Source/WebCore/platform/audio/PlatformAudioData.h
>index e4544f63254..cda72e8ab3c 100644
>--- a/Source/WebCore/platform/audio/PlatformAudioData.h
>+++ b/Source/WebCore/platform/audio/PlatformAudioData.h
>@@ -34,6 +34,7 @@ public:
>     enum class Kind {
>         None,
>         WebAudioBufferList,
>+        GStreamerAudioData,
>     };
> 
>     virtual Kind kind() const { return Kind::None; }
>diff --git a/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp b/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp
>index e514fe3428d..d5475b74cdd 100644
>--- a/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp
>+++ b/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp
>@@ -30,6 +30,7 @@
> #include <mutex>
> #include <wtf/glib/GLibUtilities.h>
> #include <wtf/glib/GUniquePtr.h>
>+#include <wtf/glib/RunLoopSourcePriority.h>
> 
> #if ENABLE(VIDEO_TRACK) && USE(GSTREAMER_MPEGTS)
> #define GST_USE_UNSTABLE_API
>@@ -320,6 +321,52 @@ bool gstRegistryHasElementForMediaType(GList* elementFactories, const char* caps
>     return result;
> }
> 
>+static void simpleBusMessageCallback(GstBus*, GstMessage* message, GstBin* pipeline)
>+{
>+    switch (GST_MESSAGE_TYPE(message)) {
>+    case GST_MESSAGE_ERROR:
>+        GST_ERROR_OBJECT(pipeline, "Got message: %" GST_PTR_FORMAT, message);
>+        {
>+            WTF::String dotFileName = String::format("%s_error", GST_OBJECT_NAME(pipeline));
>+            GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS(pipeline, GST_DEBUG_GRAPH_SHOW_ALL, dotFileName.utf8().data());
>+        }
>+        break;
>+    case GST_MESSAGE_STATE_CHANGED:
>+        if (GST_MESSAGE_SRC(message) == GST_OBJECT(pipeline)) {
>+            GstState oldState, newState, pending;
>+            gst_message_parse_state_changed(message, &oldState, &newState, &pending);
>+
>+            GST_INFO_OBJECT(pipeline, "State changed (old: %s, new: %s, pending: %s)",
>+                gst_element_state_get_name(oldState),
>+                gst_element_state_get_name(newState),
>+                gst_element_state_get_name(pending));
>+
>+            WTF::String dotFileName = String::format("%s_%s_%s",
>+                GST_OBJECT_NAME(pipeline),
>+                gst_element_state_get_name(oldState),
>+                gst_element_state_get_name(newState));
>+
>+            GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS(GST_BIN(pipeline), GST_DEBUG_GRAPH_SHOW_ALL, dotFileName.utf8().data());
>+        }
>+        break;
>+    default:
>+        break;
>+    }
>+}
>+
>+void disconnectSimpleBusMessageCallback(GstElement *pipeline)
>+{
>+    GRefPtr<GstBus> bus = adoptGRef(gst_pipeline_get_bus(GST_PIPELINE(pipeline)));
>+    g_signal_handlers_disconnect_by_func(bus.get(), reinterpret_cast<gpointer>(simpleBusMessageCallback), pipeline);
>+}
>+
>+void connectSimpleBusMessageCallback(GstElement *pipeline)
>+{
>+    GRefPtr<GstBus> bus = adoptGRef(gst_pipeline_get_bus(GST_PIPELINE(pipeline)));
>+    gst_bus_add_signal_watch_full(bus.get(), RunLoopSourcePriority::RunLoopDispatcher);
>+    g_signal_connect(bus.get(), "message", G_CALLBACK(simpleBusMessageCallback), pipeline);
>+}
>+
> }
> 
> #endif // USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.h b/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.h
>index 259255e741e..cbb49323a68 100644
>--- a/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.h
>+++ b/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.h
>@@ -82,6 +82,9 @@ inline GstClockTime toGstClockTime(const MediaTime &mediaTime)
> }
> 
> bool gstRegistryHasElementForMediaType(GList* elementFactories, const char* capsString);
>+void connectSimpleBusMessageCallback(GstElement *pipeline);
>+void disconnectSimpleBusMessageCallback(GstElement *pipeline);
>+
> }
> 
> #ifndef GST_BUFFER_DTS_OR_PTS
>diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
>index 7d847f18d76..0ec4b13f891 100644
>--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
>+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
>@@ -51,6 +51,10 @@
> #include <wtf/glib/RunLoopSourcePriority.h>
> #include <wtf/text/CString.h>
> 
>+#if ENABLE(MEDIA_STREAM) && GST_CHECK_VERSION(1, 10, 0)
>+#include "GStreamerMediaStreamSource.h"
>+#endif
>+
> #if ENABLE(VIDEO_TRACK)
> #include "AudioTrackPrivateGStreamer.h"
> #include "InbandMetadataTextTrackPrivateGStreamer.h"
>@@ -237,6 +241,11 @@ void MediaPlayerPrivateGStreamer::setPlaybinURL(const URL& url)
> }
> 
> void MediaPlayerPrivateGStreamer::load(const String& urlString)
>+{
>+    loadFull(urlString, nullptr);
>+}
>+
>+void MediaPlayerPrivateGStreamer::loadFull(const String& urlString, const gchar *playbinName)
> {
>     // FIXME: This method is still called even if supportsType() returned
>     // IsNotSupported. This would deserve more investigation but meanwhile make
>@@ -254,7 +263,7 @@ void MediaPlayerPrivateGStreamer::load(const String& urlString)
>         return;
> 
>     if (!m_pipeline)
>-        createGSTPlayBin(isMediaSource() ? "playbin" : nullptr);
>+        createGSTPlayBin(isMediaSource() ? "playbin" : playbinName);
> 
>     if (m_fillTimer.isActive())
>         m_fillTimer.stop();
>@@ -292,12 +301,19 @@ void MediaPlayerPrivateGStreamer::load(const String&, MediaSourcePrivateClient*)
> #endif
> 
> #if ENABLE(MEDIA_STREAM)
>-void MediaPlayerPrivateGStreamer::load(MediaStreamPrivate&)
>+void MediaPlayerPrivateGStreamer::load(MediaStreamPrivate& stream)
> {
>+#if GST_CHECK_VERSION(1, 10, 0)
>+    m_streamPrivate = &stream;
>+    loadFull(String("mediastream://") + stream.id(), "playbin3");
>+    ensureGLVideoSinkContext();
>+    m_player->play();
>+#else
>     // Properly fail so the global MediaPlayer tries to fallback to the next MediaPlayerPrivate.
>     m_networkState = MediaPlayer::FormatError;
>     m_player->networkStateChanged();
>     notImplemented();
>+#endif
> }
> #endif
> 
>@@ -330,7 +346,7 @@ MediaTime MediaPlayerPrivateGStreamer::playbackPosition() const
> 
>     // Position is only available if no async state change is going on and the state is either paused or playing.
>     gint64 position = GST_CLOCK_TIME_NONE;
>-    GstQuery* query= gst_query_new_position(GST_FORMAT_TIME);
>+    GstQuery* query = gst_query_new_position(GST_FORMAT_TIME);
>     if (gst_element_query(m_pipeline.get(), query))
>         gst_query_parse_position(query, 0, &position);
>     gst_query_unref(query);
>@@ -648,6 +664,25 @@ void MediaPlayerPrivateGStreamer::clearTracks()
>             m_current##Type##StreamId = String(gst_stream_get_stream_id(stream.get()));                              \
>         }                                                                                                            \
>     }
>+
>+FloatSize MediaPlayerPrivateGStreamer::naturalSize() const
>+{
>+#if ENABLE(MEDIA_STREAM)
>+    if (!m_isLegacyPlaybin && !m_currentVideoStreamId.isEmpty()) {
>+        RefPtr<VideoTrackPrivateGStreamer> videoTrack = m_videoTracks.get(m_currentVideoStreamId);
>+
>+        if (videoTrack) {
>+            auto tags = gst_stream_get_tags(videoTrack->stream());
>+            gint width, height;
>+
>+            if (gst_tag_list_get_int(tags, WEBKIT_MEDIA_TRACK_TAG_WIDTH, &width) && gst_tag_list_get_int(tags, WEBKIT_MEDIA_TRACK_TAG_HEIGHT, &height))
>+                return FloatSize(width, height);
>+        }
>+    }
>+#endif // ENABLE(MEDIA_STREAM)
>+
>+    return MediaPlayerPrivateGStreamerBase::naturalSize();
>+}
> #else
> #define CREATE_TRACK(type, _id, tracks, method, stream) m_has##Type## = true;
> #endif // ENABLE(VIDEO_TRACK)
>@@ -1165,7 +1200,8 @@ void MediaPlayerPrivateGStreamer::handleMessage(GstMessage* message)
>         // Construct a filename for the graphviz dot file output.
>         GstState newState;
>         gst_message_parse_state_changed(message, &currentState, &newState, nullptr);
>-        CString dotFileName = String::format("webkit-video.%s_%s", gst_element_state_get_name(currentState), gst_element_state_get_name(newState)).utf8();
>+        CString dotFileName = String::format("%s.%s_%s", GST_OBJECT_NAME(m_pipeline.get()),
>+            gst_element_state_get_name(currentState), gst_element_state_get_name(newState)).utf8();
>         GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS(GST_BIN(m_pipeline.get()), GST_DEBUG_GRAPH_SHOW_ALL, dotFileName.data());
> 
>         break;
>@@ -1431,7 +1467,7 @@ void MediaPlayerPrivateGStreamer::processTableOfContentsEntry(GstTocEntry* entry
> 
>     GstTagList* tags = gst_toc_entry_get_tags(entry);
>     if (tags) {
>-        gchar* title =  nullptr;
>+        gchar* title = nullptr;
>         gst_tag_list_get_string(tags, GST_TAG_TITLE, &title);
>         if (title) {
>             cue->setContent(title);
>@@ -1726,6 +1762,12 @@ void MediaPlayerPrivateGStreamer::sourceSetup(GstElement* sourceElement)
>     if (WEBKIT_IS_WEB_SRC(m_source.get())) {
>         webKitWebSrcSetMediaPlayer(WEBKIT_WEB_SRC(m_source.get()), m_player);
>         g_signal_connect(GST_ELEMENT_PARENT(m_source.get()), "element-added", G_CALLBACK(uriDecodeBinElementAddedCallback), this);
>+#if ENABLE(MEDIA_STREAM) && GST_CHECK_VERSION(1, 10, 0)
>+    } else if (WEBKIT_IS_MEDIA_STREAM_SRC(sourceElement)) {
>+        auto stream = m_streamPrivate.get();
>+        ASSERT(stream);
>+        webkitMediaStreamSrcSetStream(WEBKIT_MEDIA_STREAM_SRC(sourceElement), stream);
>+#endif
>     }
> }
> 
>@@ -2269,8 +2311,10 @@ MediaPlayer::SupportsType MediaPlayerPrivateGStreamer::supportsType(const MediaE
>         return result;
> #endif
> 
>+#if !ENABLE(MEDIA_STREAM) || !GST_CHECK_VERSION(1, 10, 0)
>     if (parameters.isMediaStream)
>         return result;
>+#endif
> 
>     if (parameters.type.isEmpty())
>         return result;
>@@ -2433,17 +2477,20 @@ void MediaPlayerPrivateGStreamer::createGSTPlayBin(const gchar* playbinName)
>     ASSERT(!m_pipeline);
> 
> #if GST_CHECK_VERSION(1, 10, 0)
>-    m_isLegacyPlaybin = !g_getenv("USE_PLAYBIN3");
>-    if (!m_isLegacyPlaybin)
>+    if (g_getenv("USE_PLAYBIN3"))
>         playbinName = "playbin3";
>+#else
>+    playbinName = "playbin";
> #endif
> 
>     if (!playbinName)
>         playbinName = "playbin";
> 
>+    m_isLegacyPlaybin = !g_strcmp0(playbinName, "playbin");
>+
>     // gst_element_factory_make() returns a floating reference so
>     // we should not adopt.
>-    setPipeline(gst_element_factory_make(playbinName, "play"));
>+    setPipeline(gst_element_factory_make(playbinName, String::format("play_%p", this).utf8().data()));
>     setStreamVolumeElement(GST_STREAM_VOLUME(m_pipeline.get()));
> 
>     GST_INFO("Using legacy playbin element: %s", boolForPrinting(m_isLegacyPlaybin));
>diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h
>index 1ae4a54bae0..b2ee5e695bd 100644
>--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h
>+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h
>@@ -179,6 +179,7 @@ private:
>     static void downloadBufferFileCreatedCallback(MediaPlayerPrivateGStreamer*);
> 
>     void setPlaybinURL(const URL& urlString);
>+    void loadFull(const String& url, const gchar *playbinName);
> 
> #if GST_CHECK_VERSION(1, 10, 0)
>     void updateTracks();
>@@ -262,7 +263,11 @@ private:
>     bool m_isLegacyPlaybin;
> #if GST_CHECK_VERSION(1, 10, 0)
>     GRefPtr<GstStreamCollection> m_streamCollection;
>-#endif
>+    FloatSize naturalSize() const final;
>+#if ENABLE(MEDIA_STREAM)
>+    RefPtr<MediaStreamPrivate> m_streamPrivate;
>+#endif // ENABLE(MEDIA_STREAM)
>+#endif // GST_CHECK_VERSION(1, 10, 0)
>     String m_currentAudioStreamId;
>     String m_currentVideoStreamId;
>     String m_currentTextStreamId;
>diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp
>index 2eb441d2753..627c4b2a27b 100644
>--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp
>+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamerBase.cpp
>@@ -81,6 +81,10 @@
> #endif // !GST_CHECK_VERSION(1, 14, 0)
> #endif // USE(LIBEPOXY)
> 
>+#if ENABLE(MEDIA_STREAM) && GST_CHECK_VERSION(1, 10, 0)
>+#include "GStreamerMediaStreamSource.h"
>+#endif
>+
> #define GST_USE_UNSTABLE_API
> #include <gst/gl/gl.h>
> #undef GST_USE_UNSTABLE_API
>@@ -143,6 +147,9 @@ void registerWebKitGStreamerElements()
>     if (!clearKeyDecryptorFactory)
>         gst_element_register(nullptr, "webkitclearkey", GST_RANK_PRIMARY + 100, WEBKIT_TYPE_MEDIA_CK_DECRYPT);
> #endif
>+#if ENABLE(MEDIA_STREAM) && GST_CHECK_VERSION(1,10,0)
>+    gst_element_register(nullptr, "mediastreamsrc", GST_RANK_PRIMARY, WEBKIT_TYPE_MEDIA_STREAM_SRC);
>+#endif
> }
> 
> bool MediaPlayerPrivateGStreamerBase::initializeGStreamerAndRegisterWebKitElements()
>diff --git a/Source/WebCore/platform/graphics/gstreamer/VideoTrackPrivateGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/VideoTrackPrivateGStreamer.cpp
>index c54200eae81..4d99786e012 100644
>--- a/Source/WebCore/platform/graphics/gstreamer/VideoTrackPrivateGStreamer.cpp
>+++ b/Source/WebCore/platform/graphics/gstreamer/VideoTrackPrivateGStreamer.cpp
>@@ -48,6 +48,14 @@ VideoTrackPrivateGStreamer::VideoTrackPrivateGStreamer(WeakPtr<MediaPlayerPrivat
>     : TrackPrivateBaseGStreamer(this, index, stream)
>     , m_player(player)
> {
>+    gint kind;
>+    auto tags = gst_stream_get_tags(m_stream.get());
>+
>+    if (gst_tag_list_get_int(tags, "webkit-media-stream-kind", &kind) && kind == static_cast<int>(VideoTrackPrivate::Kind::Main)) {
>+        GstStreamFlags streamFlags = gst_stream_get_stream_flags(stream.get());
>+        gst_stream_set_stream_flags(stream.get(), static_cast<GstStreamFlags>(streamFlags | GST_STREAM_FLAG_SELECT));
>+    }
>+
>     m_id = gst_stream_get_stream_id(stream.get());
>     setActive(gst_stream_get_stream_flags(stream.get()) & GST_STREAM_FLAG_SELECT);
>     notifyTrackOfActiveChanged();
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSource.h b/Source/WebCore/platform/mediastream/RealtimeMediaSource.h
>index 9b451205e5b..5411085c4a3 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSource.h
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSource.h
>@@ -216,7 +216,7 @@ public:
> 
>     virtual void monitorOrientation(OrientationNotifier&) { }
> 
>-    void captureFailed();
>+    virtual void captureFailed();
> 
>     // Testing only
>     virtual void delaySamples(Seconds) { };
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp b/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp
>index 2efb82d1e58..3886ff875ce 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp
>@@ -64,14 +64,7 @@ RealtimeMediaSourceCenter& RealtimeMediaSourceCenter::singleton()
>     RealtimeMediaSourceCenter* override = mediaStreamCenterOverride();
>     if (override)
>         return *override;
>-#if PLATFORM(GTK)
>-    ASSERT(isMainThread());
>-    notImplemented(); // Return MockRealtimeMediaSourceCenter to avoid crash.
>-    static NeverDestroyed<MockRealtimeMediaSourceCenter> center;
>-    return center;
>-#else
>     return RealtimeMediaSourceCenter::platformCenter();
>-#endif
> }
> 
> void RealtimeMediaSourceCenter::setSharedStreamCenterOverride(RealtimeMediaSourceCenter* center)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCaptureSource.cpp b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCaptureSource.cpp
>new file mode 100644
>index 00000000000..9c5aeafffcf
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCaptureSource.cpp
>@@ -0,0 +1,202 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+#include "GStreamerAudioCaptureSource.h"
>+
>+#include "GStreamerAudioData.h"
>+#include "GStreamerAudioStreamDescription.h"
>+#include "GStreamerCaptureDeviceManager.h"
>+
>+#include <gst/app/gstappsink.h>
>+#include <gst/gst.h>
>+#include <wtf/NeverDestroyed.h>
>+
>+namespace WebCore {
>+
>+const static CapabilityValueOrRange defaultVolumeCapability = CapabilityValueOrRange(0.0, 1.0);
>+const static RealtimeMediaSourceCapabilities::EchoCancellation defaultEchoCancellationCapability = RealtimeMediaSourceCapabilities::EchoCancellation::ReadWrite;
>+
>+GST_DEBUG_CATEGORY(webkit_audio_capture_source_debug);
>+#define GST_CAT_DEFAULT webkit_audio_capture_source_debug
>+
>+static void initializeGStreamerDebug()
>+{
>+    static std::once_flag debugRegisteredFlag;
>+    std::call_once(debugRegisteredFlag, [] {
>+        GST_DEBUG_CATEGORY_INIT(webkit_audio_capture_source_debug, "webkitaudiocapturesource", 0, "WebKit Audio Capture Source.");
>+    });
>+}
>+
>+class GStreamerAudioCaptureSourceFactory : public RealtimeMediaSource::AudioCaptureFactory {
>+public:
>+    CaptureSourceOrError createAudioCaptureSource(const CaptureDevice& device, const MediaConstraints* constraints) final
>+    {
>+        return GStreamerAudioCaptureSource::create(device.persistentId(), constraints);
>+    }
>+};
>+
>+static GStreamerAudioCaptureSourceFactory& libWebRTCAudioCaptureSourceFactory()
>+{
>+    static NeverDestroyed<GStreamerAudioCaptureSourceFactory> factory;
>+    return factory.get();
>+}
>+
>+CaptureSourceOrError GStreamerAudioCaptureSource::create(const String& deviceID, const MediaConstraints* constraints)
>+{
>+    auto device = GStreamerAudioCaptureDeviceManager::singleton().gstreamerDeviceWithUID(deviceID);
>+    if (!device) {
>+        auto errorMessage = String::format("GStreamerAudioCaptureSource::create(): GStreamer did not find the device: %s.", deviceID.utf8().data());
>+        return CaptureSourceOrError(WTFMove(errorMessage));
>+    }
>+
>+    auto source = adoptRef(*new GStreamerAudioCaptureSource(device.value()));
>+
>+    if (constraints) {
>+        auto result = source->applyConstraints(*constraints);
>+        if (result)
>+            return WTFMove(result.value().first);
>+    }
>+    return CaptureSourceOrError(WTFMove(source));
>+}
>+
>+RealtimeMediaSource::AudioCaptureFactory& GStreamerAudioCaptureSource::factory()
>+{
>+    return libWebRTCAudioCaptureSourceFactory();
>+}
>+
>+GStreamerAudioCaptureSource::GStreamerAudioCaptureSource(GStreamerCaptureDevice device)
>+    : RealtimeMediaSource(device.persistentId(), RealtimeMediaSource::Type::Audio, device.label())
>+    , m_capturer(std::make_unique<GStreamerAudioCapturer>(device))
>+{
>+    initializeGStreamerDebug();
>+}
>+
>+GStreamerAudioCaptureSource::GStreamerAudioCaptureSource(const String& deviceID, const String& name)
>+    : RealtimeMediaSource(deviceID, RealtimeMediaSource::Type::Audio, name)
>+    , m_capturer(std::make_unique<GStreamerAudioCapturer>())
>+{
>+    initializeGStreamerDebug();
>+}
>+
>+GStreamerAudioCaptureSource::~GStreamerAudioCaptureSource()
>+{
>+}
>+
>+void GStreamerAudioCaptureSource::startProducingData()
>+{
>+    m_capturer->setupPipeline();
>+    m_capturer->setSampleRate(sampleRate());
>+    g_signal_connect(m_capturer->sink(), "new-sample", G_CALLBACK(newSampleCallback), this);
>+    m_capturer->play();
>+}
>+
>+GstFlowReturn GStreamerAudioCaptureSource::newSampleCallback(GstElement* sink, GStreamerAudioCaptureSource* source)
>+{
>+    auto sample = adoptGRef(gst_app_sink_pull_sample(GST_APP_SINK(sink)));
>+
>+    // FIXME - figure out a way to avoid copying (on write) the data.
>+    GstBuffer* buf = gst_sample_get_buffer(sample.get());
>+    auto frames(std::unique_ptr<GStreamerAudioData>(new GStreamerAudioData(WTFMove(sample))));
>+    auto streamDesc(std::unique_ptr<GStreamerAudioStreamDescription>(new GStreamerAudioStreamDescription(frames->getAudioInfo())));
>+
>+    source->audioSamplesAvailable(
>+        MediaTime(GST_TIME_AS_USECONDS(GST_BUFFER_PTS(buf)), G_USEC_PER_SEC),
>+        *frames, *streamDesc, gst_buffer_get_size(buf) / frames->getAudioInfo().bpf);
>+
>+    return GST_FLOW_OK;
>+}
>+
>+void GStreamerAudioCaptureSource::stopProducingData()
>+{
>+    g_signal_handlers_disconnect_by_func(m_capturer->sink(), reinterpret_cast<gpointer>(newSampleCallback), this);
>+    m_capturer->stop();
>+}
>+
>+const RealtimeMediaSourceCapabilities& GStreamerAudioCaptureSource::capabilities() const
>+{
>+    if (m_capabilities)
>+        return m_capabilities.value();
>+
>+    uint i;
>+    GRefPtr<GstCaps> caps = m_capturer->caps();
>+    int minSampleRate = 0, maxSampleRate = 0;
>+    for (i = 0; i < gst_caps_get_size(caps.get()); i++) {
>+        int capabilityMinSampleRate = 0, capabilityMaxSampleRate = 0;
>+        GstStructure* str = gst_caps_get_structure(caps.get(), i);
>+
>+        // Only accept raw audio for now.
>+        if (!gst_structure_has_name(str, "audio/x-raw"))
>+            continue;
>+
>+        gst_structure_get(str, "rate", GST_TYPE_INT_RANGE, &capabilityMinSampleRate, &capabilityMaxSampleRate, nullptr);
>+        if (i > 0) {
>+            minSampleRate = std::min(minSampleRate, capabilityMinSampleRate);
>+            maxSampleRate = std::max(maxSampleRate, capabilityMaxSampleRate);
>+        } else {
>+            minSampleRate = capabilityMinSampleRate;
>+            maxSampleRate = capabilityMaxSampleRate;
>+        }
>+    }
>+
>+    RealtimeMediaSourceCapabilities capabilities(settings().supportedConstraints());
>+    capabilities.setDeviceId(id());
>+    capabilities.setEchoCancellation(defaultEchoCancellationCapability);
>+    capabilities.setVolume(defaultVolumeCapability);
>+    capabilities.setSampleRate(CapabilityValueOrRange(minSampleRate, maxSampleRate));
>+    m_capabilities = WTFMove(capabilities);
>+
>+    return m_capabilities.value();
>+}
>+
>+bool GStreamerAudioCaptureSource::applySampleRate(int sampleRate)
>+{
>+    return m_capturer->setSampleRate(sampleRate);
>+}
>+
>+const RealtimeMediaSourceSettings& GStreamerAudioCaptureSource::settings() const
>+{
>+    if (!m_currentSettings) {
>+        RealtimeMediaSourceSettings settings;
>+        settings.setDeviceId(id());
>+
>+        RealtimeMediaSourceSupportedConstraints supportedConstraints;
>+        supportedConstraints.setSupportsDeviceId(true);
>+        supportedConstraints.setSupportsEchoCancellation(true);
>+        supportedConstraints.setSupportsVolume(true);
>+        supportedConstraints.setSupportsSampleRate(true);
>+        settings.setSupportedConstraints(supportedConstraints);
>+
>+        m_currentSettings = WTFMove(settings);
>+    }
>+
>+    m_currentSettings->setVolume(volume());
>+    m_currentSettings->setSampleRate(sampleRate());
>+    m_currentSettings->setEchoCancellation(echoCancellation());
>+
>+    return m_currentSettings.value();
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCaptureSource.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCaptureSource.h
>new file mode 100644
>index 00000000000..3fa4a9c2e32
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCaptureSource.h
>@@ -0,0 +1,65 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+#include "GStreamerAudioCapturer.h"
>+#include "GStreamerCaptureDevice.h"
>+#include "RealtimeMediaSource.h"
>+
>+namespace WebCore {
>+
>+class GStreamerAudioCaptureSource : public RealtimeMediaSource {
>+public:
>+    static CaptureSourceOrError create(const String& deviceID, const MediaConstraints*);
>+    WEBCORE_EXPORT static AudioCaptureFactory& factory();
>+
>+    const RealtimeMediaSourceCapabilities& capabilities() const override;
>+    const RealtimeMediaSourceSettings& settings() const override;
>+
>+    GstElement* pipeline() { return m_capturer->pipeline(); }
>+    GStreamerCapturer* capturer() { return m_capturer.get(); }
>+
>+protected:
>+    GStreamerAudioCaptureSource(GStreamerCaptureDevice);
>+    GStreamerAudioCaptureSource(const String& deviceID, const String& name);
>+    virtual ~GStreamerAudioCaptureSource();
>+    void startProducingData() override;
>+    void stopProducingData() override;
>+
>+    mutable std::optional<RealtimeMediaSourceCapabilities> m_capabilities;
>+    mutable std::optional<RealtimeMediaSourceSettings> m_currentSettings;
>+
>+private:
>+    bool applySampleRate(int) final;
>+    bool isCaptureSource() const final { return true; }
>+    bool applyVolume(double) final { return true; }
>+
>+    std::unique_ptr<GStreamerAudioCapturer> m_capturer;
>+
>+    static GstFlowReturn newSampleCallback(GstElement*, GStreamerAudioCaptureSource*);
>+    void triggerSampleAvailable(GstSample*);
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCapturer.cpp b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCapturer.cpp
>new file mode 100644
>index 00000000000..64157ef70a6
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCapturer.cpp
>@@ -0,0 +1,73 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+#include "GStreamerAudioCapturer.h"
>+
>+#include "LibWebRTCAudioFormat.h"
>+
>+#include <gst/app/gstappsink.h>
>+
>+namespace WebCore {
>+
>+GStreamerAudioCapturer::GStreamerAudioCapturer(GStreamerCaptureDevice device)
>+    : GStreamerCapturer(device, adoptGRef(gst_caps_new_simple("audio/x-raw", "rate", G_TYPE_INT, LibWebRTCAudioFormat::sampleRate, nullptr)))
>+{
>+}
>+
>+GStreamerAudioCapturer::GStreamerAudioCapturer()
>+    : GStreamerCapturer("audiotestsrc", adoptGRef(gst_caps_new_simple("audio/x-raw", "rate", G_TYPE_INT, LibWebRTCAudioFormat::sampleRate, nullptr)))
>+{
>+}
>+
>+GstElement* GStreamerAudioCapturer::createConverter()
>+{
>+    auto converter = gst_parse_bin_from_description("audioconvert ! audioresample", TRUE, nullptr);
>+
>+    ASSERT(converter);
>+
>+    return converter;
>+}
>+
>+bool GStreamerAudioCapturer::setSampleRate(int sampleRate)
>+{
>+
>+    if (sampleRate > 0) {
>+        GST_INFO_OBJECT(m_pipeline.get(), "Setting SampleRate %d", sampleRate);
>+        m_caps = adoptGRef(gst_caps_new_simple("audio/x-raw", "rate", G_TYPE_INT, sampleRate, nullptr));
>+    } else {
>+        GST_INFO_OBJECT(m_pipeline.get(), "Not forcing sample rate");
>+        m_caps = adoptGRef(gst_caps_new_empty_simple("audio/x-raw"));
>+    }
>+
>+    if (!m_capsfilter.get())
>+        return false;
>+
>+    g_object_set(m_capsfilter.get(), "caps", m_caps.get(), nullptr);
>+
>+    return true;
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCapturer.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCapturer.h
>new file mode 100644
>index 00000000000..9aaf761d6c4
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioCapturer.h
>@@ -0,0 +1,43 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+
>+#include "GStreamerCapturer.h"
>+
>+namespace WebCore {
>+
>+class GStreamerAudioCapturer : public GStreamerCapturer {
>+public:
>+    GStreamerAudioCapturer(GStreamerCaptureDevice);
>+    GStreamerAudioCapturer();
>+
>+    GstElement* createConverter() final;
>+    const char* name() final { return "Audio"; }
>+
>+    bool setSampleRate(int);
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioData.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioData.h
>new file mode 100644
>index 00000000000..953f3a8a0e4
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioData.h
>@@ -0,0 +1,59 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+
>+#include "GRefPtrGStreamer.h"
>+#include "PlatformAudioData.h"
>+
>+#include <gst/audio/audio.h>
>+
>+namespace WebCore {
>+class GStreamerAudioData : public PlatformAudioData {
>+public:
>+    GStreamerAudioData(GRefPtr<GstSample>&& sample, GstAudioInfo info)
>+        : m_sample(WTFMove(sample))
>+        , m_audioInfo(info)
>+    {
>+    }
>+
>+    GStreamerAudioData(GRefPtr<GstSample>&& sample)
>+        : m_sample(WTFMove(sample))
>+    {
>+        gst_audio_info_from_caps(&m_audioInfo, gst_sample_get_caps(m_sample.get()));
>+    }
>+
>+    GstSample* getSample() { return m_sample.get(); }
>+    GstAudioInfo getAudioInfo() {return m_audioInfo; }
>+
>+private:
>+    Kind kind() const { return Kind::GStreamerAudioData; }
>+    GRefPtr<GstSample> m_sample;
>+    GRefPtr<GstCaps> m_caps;
>+
>+    GstAudioInfo m_audioInfo;
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioStreamDescription.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioStreamDescription.h
>new file mode 100644
>index 00000000000..1ff59b2a174
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerAudioStreamDescription.h
>@@ -0,0 +1,105 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+
>+#include "AudioStreamDescription.h"
>+#include <gst/audio/audio.h>
>+
>+namespace WebCore {
>+
>+class GStreamerAudioStreamDescription final: public AudioStreamDescription {
>+public:
>+    GStreamerAudioStreamDescription(GstAudioInfo info)
>+        : m_info(info)
>+        , m_caps(adoptGRef(gst_audio_info_to_caps(&m_info)))
>+    {
>+    }
>+
>+    GStreamerAudioStreamDescription(GstAudioInfo *info)
>+        : m_info(*info)
>+        , m_caps(adoptGRef(gst_audio_info_to_caps(&m_info)))
>+    {
>+    }
>+
>+    GStreamerAudioStreamDescription()
>+    {
>+        gst_audio_info_init(&m_info);
>+    }
>+
>+    WEBCORE_EXPORT ~GStreamerAudioStreamDescription() { };
>+
>+    const PlatformDescription& platformDescription() const
>+    {
>+        m_platformDescription = { PlatformDescription::GStreamerAudioStreamDescription, reinterpret_cast<const AudioStreamBasicDescription*>(&m_info) };
>+
>+        return m_platformDescription;
>+    }
>+
>+    WEBCORE_EXPORT PCMFormat format() const final {
>+        switch (GST_AUDIO_INFO_FORMAT(&m_info)) {
>+        case GST_AUDIO_FORMAT_S16LE:
>+        case GST_AUDIO_FORMAT_S16BE:
>+            return Int16;
>+        case GST_AUDIO_FORMAT_S32LE:
>+        case GST_AUDIO_FORMAT_S32BE:
>+            return Int32;
>+        case GST_AUDIO_FORMAT_F32LE:
>+        case GST_AUDIO_FORMAT_F32BE:
>+            return Float32;
>+        case GST_AUDIO_FORMAT_F64LE:
>+        case GST_AUDIO_FORMAT_F64BE:
>+            return Float64;
>+        default:
>+            break;
>+        }
>+        return None;
>+    }
>+
>+    double sampleRate() const final { return GST_AUDIO_INFO_RATE(&m_info); }
>+    bool isPCM() const final { return format() != None; }
>+    bool isInterleaved() const final { return GST_AUDIO_INFO_LAYOUT(&m_info) == GST_AUDIO_LAYOUT_INTERLEAVED; }
>+    bool isSignedInteger() const final { return GST_AUDIO_INFO_IS_INTEGER(&m_info); }
>+    bool isNativeEndian() const final { return GST_AUDIO_INFO_ENDIANNESS(&m_info) == G_BYTE_ORDER; }
>+    bool isFloat() const final { return GST_AUDIO_INFO_IS_FLOAT(&m_info); }
>+
>+    uint32_t numberOfInterleavedChannels() const final { return isInterleaved() ? GST_AUDIO_INFO_CHANNELS(&m_info) : TRUE; }
>+    uint32_t numberOfChannelStreams() const final { return GST_AUDIO_INFO_CHANNELS(&m_info); }
>+    uint32_t numberOfChannels() const final { return GST_AUDIO_INFO_CHANNELS(&m_info); }
>+    uint32_t sampleWordSize() const final { return GST_AUDIO_INFO_BPS(&m_info); }
>+
>+    bool operator==(const GStreamerAudioStreamDescription& other) { return gst_audio_info_is_equal(&m_info, &other.m_info); }
>+    bool operator!=(const GStreamerAudioStreamDescription& other) { return !operator == (other); }
>+
>+    GstCaps* caps() { return m_caps.get(); }
>+    GstAudioInfo* getInfo() { return &m_info; }
>+
>+private:
>+    GstAudioInfo m_info;
>+    GRefPtr<GstCaps> m_caps;
>+    mutable PlatformDescription m_platformDescription;
>+};
>+
>+} // WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDevice.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDevice.h
>new file mode 100644
>index 00000000000..6422ddd83a3
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDevice.h
>@@ -0,0 +1,50 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(GSTREAMER)
>+
>+#include "CaptureDevice.h"
>+#include "GStreamerCommon.h"
>+
>+#include <gst/gst.h>
>+
>+namespace WebCore {
>+
>+class GStreamerCaptureDevice : public CaptureDevice {
>+public:
>+    GStreamerCaptureDevice(GRefPtr<GstDevice>&& device, const String& persistentId, DeviceType type, const String& label, const String& groupId = emptyString())
>+        : CaptureDevice(persistentId, type, label, groupId)
>+        , m_device(device)
>+    {
>+    }
>+
>+    GstCaps* caps() const { return gst_device_get_caps(m_device.get()); }
>+    GstDevice* device() { return m_device.get(); }
>+
>+private:
>+    GRefPtr<GstDevice> m_device;
>+};
>+
>+}
>+
>+#endif // ENABLE(MEDIA_STREAM)  && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.cpp b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.cpp
>new file mode 100644
>index 00000000000..3b78287e7aa
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.cpp
>@@ -0,0 +1,134 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(MEDIA_STREAM) && USE(GSTREAMER)
>+#include "GStreamerCaptureDeviceManager.h"
>+
>+#include "GStreamerCommon.h"
>+
>+namespace WebCore {
>+
>+GStreamerAudioCaptureDeviceManager& GStreamerAudioCaptureDeviceManager::singleton()
>+{
>+    static NeverDestroyed<GStreamerAudioCaptureDeviceManager> manager;
>+    return manager;
>+}
>+
>+GStreamerVideoCaptureDeviceManager& GStreamerVideoCaptureDeviceManager::singleton()
>+{
>+    static NeverDestroyed<GStreamerVideoCaptureDeviceManager> manager;
>+    return manager;
>+}
>+
>+GStreamerDisplayCaptureDeviceManager& GStreamerDisplayCaptureDeviceManager::singleton()
>+{
>+    static NeverDestroyed<GStreamerDisplayCaptureDeviceManager> manager;
>+    return manager;
>+}
>+
>+std::optional<GStreamerCaptureDevice> GStreamerCaptureDeviceManager::gstreamerDeviceWithUID(const String& deviceID)
>+{
>+    captureDevices();
>+
>+    for (auto& device : m_gstreamerDevices) {
>+        if (device.persistentId() == deviceID)
>+            return device;
>+    }
>+    return std::nullopt;
>+}
>+
>+const Vector<CaptureDevice>& GStreamerCaptureDeviceManager::captureDevices()
>+{
>+    initializeGStreamer();
>+    if (m_devices.isEmpty())
>+        refreshCaptureDevices();
>+
>+    return m_devices;
>+}
>+
>+void GStreamerCaptureDeviceManager::deviceAdded(GRefPtr<GstDevice>&& device)
>+{
>+    GUniquePtr<GstStructure> properties(gst_device_get_properties(device.get()));
>+    const char* klass = gst_structure_get_string(properties.get(), "device.class");
>+
>+    if (klass && !g_strcmp0(klass, "monitor"))
>+        return;
>+
>+    CaptureDevice::DeviceType type = deviceType();
>+    GUniquePtr<char> deviceClassChar(gst_device_get_device_class(device.get()));
>+    String deviceClass(String(deviceClassChar.get()));
>+    if (type == CaptureDevice::DeviceType::Microphone && !deviceClass.startsWith("Audio"))
>+        return;
>+    if (type == CaptureDevice::DeviceType::Camera && !deviceClass.startsWith("Video"))
>+        return;
>+
>+    // This isn't really a UID but should be good enough (libwebrtc
>+    // itself does that at least for pulseaudio devices).
>+    GUniquePtr<char> deviceName(gst_device_get_display_name(device.get()));
>+    String identifier = String::fromUTF8(deviceName.get());
>+
>+    auto gstCaptureDevice = GStreamerCaptureDevice(WTFMove(device), identifier, type, identifier);
>+    gstCaptureDevice.setEnabled(true);
>+    m_gstreamerDevices.append(WTFMove(gstCaptureDevice));
>+    // FIXME: We need a CaptureDevice copy in other vector just for captureDevices API.
>+    auto captureDevice = CaptureDevice(identifier, type, identifier);
>+    captureDevice.setEnabled(true);
>+    m_devices.append(WTFMove(captureDevice));
>+}
>+
>+void GStreamerCaptureDeviceManager::refreshCaptureDevices()
>+{
>+    if (!m_deviceMonitor) {
>+        m_deviceMonitor = adoptGRef(gst_device_monitor_new());
>+
>+        CaptureDevice::DeviceType type = deviceType();
>+        if (type == CaptureDevice::DeviceType::Camera) {
>+            GRefPtr<GstCaps> caps = adoptGRef(gst_caps_new_empty_simple("video/x-raw"));
>+            gst_device_monitor_add_filter(m_deviceMonitor.get(), "Video/Source", caps.get());
>+        } else if (type == CaptureDevice::DeviceType::Microphone) {
>+            GRefPtr<GstCaps> caps = adoptGRef(gst_caps_new_empty_simple("audio/x-raw"));
>+            gst_device_monitor_add_filter(m_deviceMonitor.get(), "Audio/Source", caps.get());
>+        }
>+        // FIXME: Add monitor for added/removed messages on the bus.
>+    }
>+
>+    if (!gst_device_monitor_start(m_deviceMonitor.get())) {
>+        GST_WARNING_OBJECT(m_deviceMonitor.get(), "Could not start device monitor");
>+        m_deviceMonitor = nullptr;
>+
>+        return;
>+    }
>+
>+    GList* devices = gst_device_monitor_get_devices(m_deviceMonitor.get());
>+    while (devices) {
>+        GRefPtr<GstDevice> device = adoptGRef(GST_DEVICE_CAST(devices->data));
>+        deviceAdded(WTFMove(device));
>+        devices = g_list_delete_link(devices, devices);
>+    }
>+
>+    gst_device_monitor_stop(m_deviceMonitor.get());
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.h
>new file mode 100644
>index 00000000000..86392414d01
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCaptureDeviceManager.h
>@@ -0,0 +1,81 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(GSTREAMER)
>+
>+#include "CaptureDeviceManager.h"
>+#include "GRefPtrGStreamer.h"
>+#include "GStreamerCaptureDevice.h"
>+
>+namespace WebCore {
>+
>+class GStreamerCaptureDeviceManager : public CaptureDeviceManager {
>+public:
>+    std::optional<GStreamerCaptureDevice> gstreamerDeviceWithUID(const String&);
>+
>+    void refreshCaptureDevices() final;
>+    const Vector<CaptureDevice>& captureDevices() final;
>+    virtual CaptureDevice::DeviceType deviceType() = 0;
>+
>+private:
>+    void deviceAdded(GRefPtr<GstDevice>&&);
>+
>+    GRefPtr<GstDeviceMonitor> m_deviceMonitor;
>+    Vector<GStreamerCaptureDevice> m_gstreamerDevices;
>+    Vector<CaptureDevice> m_devices;
>+};
>+
>+class GStreamerAudioCaptureDeviceManager final : public GStreamerCaptureDeviceManager {
>+    friend class NeverDestroyed<GStreamerAudioCaptureDeviceManager>;
>+public:
>+    static GStreamerAudioCaptureDeviceManager& singleton();
>+    CaptureDevice::DeviceType deviceType() final { return CaptureDevice::DeviceType::Microphone; }
>+private:
>+    GStreamerAudioCaptureDeviceManager() = default;
>+    ~GStreamerAudioCaptureDeviceManager() = default;
>+};
>+
>+class GStreamerVideoCaptureDeviceManager final : public GStreamerCaptureDeviceManager {
>+    friend class NeverDestroyed<GStreamerVideoCaptureDeviceManager>;
>+public:
>+    static GStreamerVideoCaptureDeviceManager& singleton();
>+    static RealtimeMediaSource::VideoCaptureFactory& videoFactory();
>+    CaptureDevice::DeviceType deviceType() final { return CaptureDevice::DeviceType::Camera; }
>+private:
>+    GStreamerVideoCaptureDeviceManager() = default;
>+    ~GStreamerVideoCaptureDeviceManager() = default;
>+};
>+
>+class GStreamerDisplayCaptureDeviceManager final : public GStreamerCaptureDeviceManager {
>+    friend class NeverDestroyed<GStreamerDisplayCaptureDeviceManager>;
>+public:
>+    static GStreamerDisplayCaptureDeviceManager& singleton();
>+    CaptureDevice::DeviceType deviceType() final { return CaptureDevice::DeviceType::Screen; }
>+private:
>+    GStreamerDisplayCaptureDeviceManager() = default;
>+    ~GStreamerDisplayCaptureDeviceManager() = default;
>+};
>+
>+}
>+
>+#endif // ENABLE(MEDIA_STREAM)  && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerCapturer.cpp b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCapturer.cpp
>new file mode 100644
>index 00000000000..ecff0351b92
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCapturer.cpp
>@@ -0,0 +1,198 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if USE(GSTREAMER)
>+#include <gst/gst.h>
>+#endif
>+
>+#if ENABLE(VIDEO) && ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER) && GST_CHECK_VERSION(1, 10, 0)
>+#include "GStreamerCapturer.h"
>+
>+#include <gst/app/gstappsink.h>
>+#include <gst/app/gstappsrc.h>
>+#include <mutex>
>+#include <webrtc/api/mediastreaminterface.h>
>+
>+GST_DEBUG_CATEGORY(webkit_capturer_debug);
>+#define GST_CAT_DEFAULT webkit_capturer_debug
>+
>+namespace WebCore {
>+
>+static void initializeGStreamerAndDebug()
>+{
>+    initializeGStreamer();
>+
>+    static std::once_flag debugRegisteredFlag;
>+    std::call_once(debugRegisteredFlag, [] {
>+        GST_DEBUG_CATEGORY_INIT(webkit_capturer_debug, "webkitcapturer", 0, "WebKit Capturer");
>+    });
>+}
>+
>+GStreamerCapturer::GStreamerCapturer(GStreamerCaptureDevice device, GRefPtr<GstCaps> caps)
>+    : m_device(device.device())
>+    , m_caps(caps)
>+    , m_sourceFactory(nullptr)
>+{
>+    initializeGStreamerAndDebug();
>+}
>+
>+GStreamerCapturer::GStreamerCapturer(const char* sourceFactory, GRefPtr<GstCaps> caps)
>+    : m_device(nullptr)
>+    , m_caps(caps)
>+    , m_sourceFactory(sourceFactory)
>+{
>+    initializeGStreamerAndDebug();
>+}
>+
>+GStreamerCapturer::~GStreamerCapturer()
>+{
>+    if (m_pipeline)
>+        disconnectSimpleBusMessageCallback(pipeline());
>+}
>+
>+GstElement* GStreamerCapturer::createSource()
>+{
>+    if (m_sourceFactory) {
>+        m_src = makeElement(m_sourceFactory);
>+        if (GST_IS_APP_SRC(m_src.get()))
>+            g_object_set(m_src.get(), "is-live", true, "format", GST_FORMAT_TIME, nullptr);
>+
>+        ASSERT(m_src);
>+        return m_src.get();
>+    }
>+
>+    ASSERT(m_device);
>+    GUniquePtr<char> sourceName(g_strdup_printf("%s_%p", name(), this));
>+    m_src = gst_device_create_element(m_device.get(), sourceName.get());
>+    ASSERT(m_src);
>+
>+    return m_src.get();
>+}
>+
>+GstCaps* GStreamerCapturer::caps()
>+{
>+    if (m_sourceFactory) {
>+        GRefPtr<GstElement> element = makeElement(m_sourceFactory);
>+        auto pad = adoptGRef(gst_element_get_static_pad(element.get(), "src"));
>+
>+        return gst_pad_query_caps(pad.get(), nullptr);
>+    }
>+
>+    ASSERT(m_device);
>+    return gst_device_get_caps(m_device.get());
>+}
>+
>+void GStreamerCapturer::setupPipeline()
>+{
>+    if (m_pipeline)
>+        disconnectSimpleBusMessageCallback(pipeline());
>+
>+    m_pipeline = makeElement("pipeline");
>+
>+    GRefPtr<GstElement> source = createSource();
>+    GRefPtr<GstElement> converter = createConverter();
>+
>+    m_capsfilter = makeElement("capsfilter");
>+    m_tee = makeElement("tee");
>+    m_sink = makeElement("appsink");
>+
>+    gst_app_sink_set_emit_signals(GST_APP_SINK(m_sink.get()), TRUE);
>+    g_object_set(m_capsfilter.get(), "caps", m_caps.get(), nullptr);
>+
>+    gst_bin_add_many(GST_BIN(m_pipeline.get()), source.get(), converter.get(), m_capsfilter.get(), m_tee.get(), nullptr);
>+    gst_element_link_many(source.get(), converter.get(), m_capsfilter.get(), m_tee.get(), nullptr);
>+
>+    addSink(m_sink.get());
>+
>+    connectSimpleBusMessageCallback(pipeline());
>+}
>+
>+GstElement* GStreamerCapturer::makeElement(const char* factoryName)
>+{
>+    auto element = gst_element_factory_make(factoryName, nullptr);
>+    ASSERT(element);
>+    GUniquePtr<char> capturerName(g_strdup_printf("%s_capturer_%s_%p", name(), GST_OBJECT_NAME(element), this));
>+    gst_object_set_name(GST_OBJECT(element), capturerName.get());
>+
>+    return element;
>+}
>+
>+void GStreamerCapturer::addSink(GstElement* newSink)
>+{
>+    ASSERT(m_pipeline);
>+    ASSERT(m_tee);
>+
>+    auto queue = makeElement("queue");
>+    gst_bin_add_many(GST_BIN(pipeline()), queue, newSink, nullptr);
>+    gst_element_sync_state_with_parent(queue);
>+    gst_element_sync_state_with_parent(newSink);
>+
>+    if (!gst_element_link_pads(m_tee.get(), "src_%u", queue, "sink")) {
>+        ASSERT_NOT_REACHED();
>+        return;
>+    }
>+
>+    if (!gst_element_link(queue, newSink)) {
>+        ASSERT_NOT_REACHED();
>+        return;
>+    }
>+
>+    if (newSink == m_sink.get()) {
>+        GST_INFO_OBJECT(m_pipeline.get(), "Setting queue as leaky upstream"
>+            " so that the player can set the sink to PAUSED without "
>+            " setting the whole capturer to PAUSED");
>+        g_object_set(queue, "leaky", 2 /* upstream */, nullptr);
>+    }
>+
>+    GST_INFO_OBJECT(pipeline(), "Adding sink: %" GST_PTR_FORMAT, newSink);
>+
>+    GUniquePtr<char> dumpName(g_strdup_printf("%s_sink_%s_added", GST_OBJECT_NAME(pipeline()), GST_OBJECT_NAME(newSink)));
>+    GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS(GST_BIN(pipeline()), GST_DEBUG_GRAPH_SHOW_ALL, dumpName.get());
>+}
>+
>+void GStreamerCapturer::play()
>+{
>+    ASSERT(m_pipeline);
>+
>+    GST_INFO_OBJECT(pipeline(), "Going to PLAYING!");
>+
>+    gst_element_set_state(pipeline(), GST_STATE_PLAYING);
>+}
>+
>+void GStreamerCapturer::stop()
>+{
>+    ASSERT(m_pipeline);
>+
>+    GST_INFO_OBJECT(pipeline(), "Tearing down!");
>+
>+    // Make sure to remove sync handler before tearing down, avoiding
>+    // possible deadlocks.
>+    GRefPtr<GstBus> bus = adoptGRef(gst_pipeline_get_bus(GST_PIPELINE(pipeline())));
>+    gst_bus_set_sync_handler(bus.get(), nullptr, nullptr, nullptr);
>+
>+    gst_element_set_state(pipeline(), GST_STATE_NULL);
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(VIDEO) && ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER) && GST_CHECK_VERSION(1, 10, 0)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerCapturer.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCapturer.h
>new file mode 100644
>index 00000000000..7bfcedad801
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerCapturer.h
>@@ -0,0 +1,72 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+
>+#include "GStreamerCaptureDevice.h"
>+#include "GStreamerCommon.h"
>+#include "LibWebRTCMacros.h"
>+
>+#include <gst/gst.h>
>+
>+namespace WebCore {
>+
>+class GStreamerCapturer {
>+public:
>+    GStreamerCapturer(GStreamerCaptureDevice, GRefPtr<GstCaps>);
>+    GStreamerCapturer(const char* sourceFactory, GRefPtr<GstCaps>);
>+    ~GStreamerCapturer();
>+
>+    void setupPipeline();
>+    virtual void play();
>+    virtual void stop();
>+    GstCaps* caps();
>+    void addSink(GstElement *newSink);
>+    GstElement* makeElement(const char* factoryName);
>+    GstElement* createSource();
>+    GstElement* source() { return m_src.get();  }
>+    virtual const char* name() = 0;
>+
>+    GstElement* sink() const { return m_sink.get(); }
>+    void setSink(GstElement* sink) { m_sink = adoptGRef(sink); };
>+
>+    GstElement* pipeline() const { return m_pipeline.get(); }
>+    virtual GstElement* createConverter() = 0;
>+
>+protected:
>+    GRefPtr<GstElement> m_sink;
>+    GRefPtr<GstElement> m_src;
>+    GRefPtr<GstElement> m_tee;
>+    GRefPtr<GstElement> m_capsfilter;
>+    GRefPtr<GstDevice> m_device;
>+    GRefPtr<GstCaps> m_caps;
>+    GRefPtr<GstElement> m_pipeline;
>+
>+private:
>+    const char* m_sourceFactory;
>+
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.cpp b/Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.cpp
>new file mode 100644
>index 00000000000..799405c29c6
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.cpp
>@@ -0,0 +1,531 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if USE(GSTREAMER)
>+#include <gst/gst.h>
>+#endif
>+
>+#if ENABLE(VIDEO) && ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER) && GST_CHECK_VERSION(1, 10, 0)
>+#include "GStreamerMediaStreamSource.h"
>+
>+#include "AudioTrackPrivate.h"
>+#include "GStreamerCommon.h"
>+#include "GStreamerVideoCaptureSource.h"
>+#include "MediaSampleGStreamer.h"
>+#include "VideoTrackPrivate.h"
>+#include "GStreamerAudioData.h"
>+
>+#include <gst/app/gstappsrc.h>
>+#include <gst/base/gstflowcombiner.h>
>+
>+namespace WebCore {
>+
>+static void webkitMediaStreamSrcPushVideoSample(WebKitMediaStreamSrc* self, GstSample* gstsample);
>+static void webkitMediaStreamSrcPushAudioSample(WebKitMediaStreamSrc* self, GstSample* gstsample);
>+static void webkitMediaStreamSrcTrackEnded(WebKitMediaStreamSrc* self, MediaStreamTrackPrivate&);
>+
>+static GstStaticPadTemplate videoSrcTemplate = GST_STATIC_PAD_TEMPLATE("video_src",
>+    GST_PAD_SRC,
>+    GST_PAD_SOMETIMES,
>+    GST_STATIC_CAPS("video/x-raw"));
>+
>+static GstStaticPadTemplate audioSrcTemplate = GST_STATIC_PAD_TEMPLATE("audio_src",
>+    GST_PAD_SRC,
>+    GST_PAD_SOMETIMES,
>+    GST_STATIC_CAPS("audio/x-raw(ANY);"));
>+
>+static GstTagList* mediaStreamTrackPrivateGetTags(MediaStreamTrackPrivate* track)
>+{
>+    auto taglist = gst_tag_list_new_empty();
>+
>+    if (!track->label().isEmpty()) {
>+        gst_tag_list_add(taglist, GST_TAG_MERGE_APPEND,
>+            GST_TAG_TITLE, track->label().utf8().data(), nullptr);
>+    }
>+
>+    if (track->type() == RealtimeMediaSource::Type::Audio) {
>+        gst_tag_list_add(taglist, GST_TAG_MERGE_APPEND, WEBKIT_MEDIA_TRACK_TAG_KIND,
>+            static_cast<int>(AudioTrackPrivate::Kind::Main), nullptr);
>+    } else if (track->type() == RealtimeMediaSource::Type::Video) {
>+        gst_tag_list_add(taglist, GST_TAG_MERGE_APPEND, WEBKIT_MEDIA_TRACK_TAG_KIND,
>+            static_cast<int>(VideoTrackPrivate::Kind::Main), nullptr);
>+
>+        if (track->isCaptureTrack()) {
>+            GStreamerVideoCaptureSource& source = static_cast<GStreamerVideoCaptureSource&>(
>+                track->source());
>+
>+            gst_tag_list_add(taglist, GST_TAG_MERGE_APPEND,
>+                WEBKIT_MEDIA_TRACK_TAG_WIDTH, source.size().width(),
>+                WEBKIT_MEDIA_TRACK_TAG_HEIGHT, source.size().height(), nullptr);
>+        }
>+    }
>+
>+    return taglist;
>+}
>+
>+GstStream* webkitMediaStreamNew(MediaStreamTrackPrivate* track)
>+{
>+    GRefPtr<GstCaps> caps;
>+    GstStreamType type;
>+
>+    if (track->type() == RealtimeMediaSource::Type::Audio) {
>+        caps = adoptGRef(gst_static_pad_template_get_caps(&audioSrcTemplate));
>+        type = GST_STREAM_TYPE_AUDIO;
>+    } else if (track->type() == RealtimeMediaSource::Type::Video) {
>+        caps = adoptGRef(gst_static_pad_template_get_caps(&videoSrcTemplate));
>+        type = GST_STREAM_TYPE_VIDEO;
>+    } else {
>+        GST_FIXME("Handle %d type", (gint) track->type());
>+
>+        return nullptr;
>+    }
>+
>+    auto gststream = (GstStream*)gst_stream_new(track->id().utf8().data(),
>+        caps.get(), type, GST_STREAM_FLAG_SELECT);
>+    auto tags = adoptGRef(mediaStreamTrackPrivateGetTags(track));
>+    gst_stream_set_tags(gststream, tags.get());
>+
>+    return gststream;
>+}
>+
>+class WebKitMediaStreamTrackObserver
>+    : public MediaStreamTrackPrivate::Observer {
>+public:
>+    virtual ~WebKitMediaStreamTrackObserver() { };
>+    WebKitMediaStreamTrackObserver(WebKitMediaStreamSrc* src)
>+        : m_mediaStreamSrc(src) { }
>+    void trackStarted(MediaStreamTrackPrivate&) final { };
>+
>+    void trackEnded(MediaStreamTrackPrivate& track) final
>+    {
>+        webkitMediaStreamSrcTrackEnded(m_mediaStreamSrc, track);
>+    }
>+
>+    void trackMutedChanged(MediaStreamTrackPrivate&) final { };
>+    void trackSettingsChanged(MediaStreamTrackPrivate&) final { };
>+    void trackEnabledChanged(MediaStreamTrackPrivate&) final { };
>+    void readyStateChanged(MediaStreamTrackPrivate&) final { };
>+
>+    void sampleBufferUpdated(MediaStreamTrackPrivate&, MediaSample& sample) final
>+    {
>+        auto gstsample = static_cast<MediaSampleGStreamer*>(&sample)->platformSample().sample.gstSample;
>+
>+        webkitMediaStreamSrcPushVideoSample(m_mediaStreamSrc, gstsample);
>+    }
>+
>+    void audioSamplesAvailable(MediaStreamTrackPrivate&, const MediaTime&, const PlatformAudioData& audioData, const AudioStreamDescription&, size_t) final
>+    {
>+        auto audiodata = static_cast<const GStreamerAudioData&>(audioData);
>+
>+        webkitMediaStreamSrcPushAudioSample(m_mediaStreamSrc, audiodata.getSample());
>+    }
>+
>+private:
>+    WebKitMediaStreamSrc* m_mediaStreamSrc;
>+};
>+
>+typedef struct _WebKitMediaStreamSrcClass WebKitMediaStreamSrcClass;
>+struct _WebKitMediaStreamSrc {
>+    GstBin parent_instance;
>+
>+    gchar* uri;
>+
>+    GstElement* audioSrc;
>+    GstElement* videoSrc;
>+
>+    std::unique_ptr<WebKitMediaStreamTrackObserver> observer;
>+    String videoTrackID;
>+    volatile gint npads;
>+    gulong probeid;
>+    RefPtr<MediaStreamPrivate> stream;
>+
>+    GstFlowCombiner* flowCombiner;
>+    GRefPtr<GstStreamCollection> streamCollection;
>+};
>+
>+struct _WebKitMediaStreamSrcClass {
>+    GstBinClass parent_class;
>+};
>+
>+enum {
>+    PROP_0,
>+    PROP_IS_LIVE,
>+    PROP_LAST
>+};
>+
>+static GstURIType webkit_media_stream_src_uri_get_type(GType)
>+{
>+    return GST_URI_SRC;
>+}
>+
>+static const gchar* const* webkit_media_stream_src_uri_get_protocols(GType)
>+{
>+    static const gchar* protocols[] = { "mediastream", nullptr };
>+
>+    return protocols;
>+}
>+
>+static gchar* webkit_media_stream_src_uri_get_uri(GstURIHandler* handler)
>+{
>+    WebKitMediaStreamSrc* self = WEBKIT_MEDIA_STREAM_SRC(handler);
>+
>+    /* FIXME: make thread-safe */
>+    return g_strdup(self->uri);
>+}
>+
>+static gboolean webkitMediaStreamSrcUriSetUri(GstURIHandler* handler, const gchar* uri,
>+    GError**)
>+{
>+    WebKitMediaStreamSrc* self = WEBKIT_MEDIA_STREAM_SRC(handler);
>+    self->uri = g_strdup(uri);
>+
>+    return TRUE;
>+}
>+
>+static void webkitMediaStreamSrcUriHandlerInit(gpointer g_iface, gpointer)
>+{
>+    GstURIHandlerInterface* iface = (GstURIHandlerInterface*)g_iface;
>+
>+    iface->get_type = webkit_media_stream_src_uri_get_type;
>+    iface->get_protocols = webkit_media_stream_src_uri_get_protocols;
>+    iface->get_uri = webkit_media_stream_src_uri_get_uri;
>+    iface->set_uri = webkitMediaStreamSrcUriSetUri;
>+}
>+
>+GST_DEBUG_CATEGORY_STATIC(webkitMediaStreamSrcDebug);
>+#define GST_CAT_DEFAULT webkitMediaStreamSrcDebug
>+
>+#define doInit                                                                                                                                                              \
>+    G_IMPLEMENT_INTERFACE(GST_TYPE_URI_HANDLER, webkitMediaStreamSrcUriHandlerInit);                                                                                    \
>+    GST_DEBUG_CATEGORY_INIT(webkitMediaStreamSrcDebug, "webkitwebmediastreamsrc", 0, "mediastreamsrc element");                                                           \
>+    gst_tag_register_static(WEBKIT_MEDIA_TRACK_TAG_WIDTH, GST_TAG_FLAG_META, G_TYPE_INT, "Webkit MediaStream width", "Webkit MediaStream width", gst_tag_merge_use_first);    \
>+    gst_tag_register_static(WEBKIT_MEDIA_TRACK_TAG_HEIGHT, GST_TAG_FLAG_META, G_TYPE_INT, "Webkit MediaStream height", "Webkit MediaStream height", gst_tag_merge_use_first); \
>+    gst_tag_register_static(WEBKIT_MEDIA_TRACK_TAG_KIND, GST_TAG_FLAG_META, G_TYPE_INT, "Webkit MediaStream Kind", "Webkit MediaStream Kind", gst_tag_merge_use_first);
>+
>+G_DEFINE_TYPE_WITH_CODE(WebKitMediaStreamSrc, webkit_media_stream_src, GST_TYPE_BIN, doInit);
>+
>+static void webkitMediaStreamSrcSetProperty(GObject* object, guint prop_id,
>+    const GValue*, GParamSpec* pspec)
>+{
>+    switch (prop_id) {
>+    default:
>+        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
>+        break;
>+    }
>+}
>+
>+static void webkitMediaStreamSrcGetProperty(GObject* object, guint prop_id, GValue* value,
>+    GParamSpec* pspec)
>+{
>+    switch (prop_id) {
>+    case PROP_IS_LIVE:
>+        g_value_set_boolean(value, TRUE);
>+        break;
>+    default:
>+        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
>+        break;
>+    }
>+}
>+
>+static void webkitMediaStreamSrcDispose(GObject* object)
>+{
>+    WebKitMediaStreamSrc* self = WEBKIT_MEDIA_STREAM_SRC(object);
>+
>+    if (self->audioSrc) {
>+        gst_bin_remove(GST_BIN(self), self->audioSrc);
>+        self->audioSrc = nullptr;
>+    }
>+
>+    if (self->videoSrc) {
>+        gst_bin_remove(GST_BIN(self), self->videoSrc);
>+        self->videoSrc = nullptr;
>+    }
>+}
>+
>+static void webkitMediaStreamSrcFinalize(GObject* object)
>+{
>+    WebKitMediaStreamSrc* self = WEBKIT_MEDIA_STREAM_SRC(object);
>+
>+    GST_OBJECT_LOCK(self);
>+    for (auto& track : self->stream->tracks())
>+        track->removeObserver(*self->observer.get());
>+    GST_OBJECT_UNLOCK(self);
>+
>+    g_clear_pointer(&self->uri, g_free);
>+    gst_flow_combiner_free(self->flowCombiner);
>+}
>+
>+static GstStateChangeReturn webkitMediaStreamSrcChangeState(GstElement* element, GstStateChange transition)
>+{
>+    GstStateChangeReturn result;
>+    auto* self = WEBKIT_MEDIA_STREAM_SRC(element);
>+
>+    if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
>+
>+        GST_OBJECT_LOCK(self);
>+        for (auto& track : self->stream->tracks())
>+            track->removeObserver(*self->observer.get());
>+        GST_OBJECT_UNLOCK(self);
>+    }
>+
>+    result = GST_ELEMENT_CLASS(webkit_media_stream_src_parent_class)->change_state(element, transition);
>+
>+    if (transition == GST_STATE_CHANGE_READY_TO_PAUSED)
>+        result = GST_STATE_CHANGE_NO_PREROLL;
>+
>+    return result;
>+}
>+
>+static void webkit_media_stream_src_class_init(WebKitMediaStreamSrcClass* klass)
>+{
>+    GObjectClass* gobject_class = G_OBJECT_CLASS(klass);
>+    GstElementClass* gstelement_klass = GST_ELEMENT_CLASS(klass);
>+
>+    gobject_class->finalize = webkitMediaStreamSrcFinalize;
>+    gobject_class->dispose = webkitMediaStreamSrcDispose;
>+    gobject_class->get_property = webkitMediaStreamSrcGetProperty;
>+    gobject_class->set_property = webkitMediaStreamSrcSetProperty;
>+
>+    g_object_class_install_property(gobject_class, PROP_IS_LIVE,
>+        g_param_spec_boolean("is-live", "Is Live",
>+            "Let playbin3 know we are a live source.",
>+            TRUE, (GParamFlags)(G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
>+
>+    gstelement_klass->change_state = webkitMediaStreamSrcChangeState;
>+    gst_element_class_add_pad_template(gstelement_klass,
>+        gst_static_pad_template_get(&videoSrcTemplate));
>+    gst_element_class_add_pad_template(gstelement_klass,
>+        gst_static_pad_template_get(&audioSrcTemplate));
>+}
>+
>+static void webkit_media_stream_src_init(WebKitMediaStreamSrc* self)
>+{
>+    self->observer = std::make_unique<WebKitMediaStreamTrackObserver>(self);
>+    self->flowCombiner = gst_flow_combiner_new();
>+}
>+
>+typedef struct {
>+    WebKitMediaStreamSrc* self;
>+    RefPtr<MediaStreamTrackPrivate> track;
>+    GstStaticPadTemplate* pad_template;
>+} ProbeData;
>+
>+static GstFlowReturn webkitMediaStreamSrcChain(GstPad* pad, GstObject* object, GstBuffer* buffer)
>+{
>+    GstFlowReturn result;
>+    GRefPtr<WebKitMediaStreamSrc> self = adoptGRef(WEBKIT_MEDIA_STREAM_SRC(gst_object_get_parent(object)));
>+
>+    result = gst_flow_combiner_update_pad_flow(self.get()->flowCombiner, pad,
>+        gst_proxy_pad_chain_default(pad, GST_OBJECT(self.get()), buffer));
>+
>+    return result;
>+}
>+
>+static void webkitMediaStreamSrcAddPad(WebKitMediaStreamSrc* self, GstPad* target, GstStaticPadTemplate* pad_template)
>+{
>+    auto padname = String::format("src_%u", g_atomic_int_add(&(self->npads), 1));
>+    auto ghostpad = gst_ghost_pad_new_from_template(padname.utf8().data(), target,
>+        gst_static_pad_template_get(pad_template));
>+
>+    GST_DEBUG_OBJECT(self, "%s Ghosting %" GST_PTR_FORMAT,
>+        gst_object_get_path_string(GST_OBJECT_CAST(self)),
>+        target);
>+
>+    auto proxypad = adoptGRef(GST_PAD(gst_proxy_pad_get_internal(GST_PROXY_PAD(ghostpad))));
>+    gst_pad_set_chain_function(proxypad.get(),
>+        static_cast<GstPadChainFunction>(webkitMediaStreamSrcChain));
>+    gst_pad_set_active(ghostpad, TRUE);
>+    ASSERT(gst_element_add_pad(GST_ELEMENT(self), GST_PAD (ghostpad)));
>+}
>+
>+static GstPadProbeReturn webkitMediaStreamSrcPadProbeCb(GstPad* pad, GstPadProbeInfo* info, ProbeData* data)
>+{
>+    GstEvent* event = GST_PAD_PROBE_INFO_EVENT(info);
>+    WebKitMediaStreamSrc* self = data->self;
>+
>+    switch (GST_EVENT_TYPE(event)) {
>+    case GST_EVENT_STREAM_START: {
>+        const gchar* stream_id;
>+        GRefPtr<GstStream> stream = nullptr;
>+
>+        gst_event_parse_stream_start(event, &stream_id);
>+        if (!g_strcmp0(stream_id, data->track->id().utf8().data())) {
>+            GST_INFO_OBJECT(pad, "Event has been sticked already");
>+            return GST_PAD_PROBE_OK;
>+        }
>+
>+        auto stream_start = gst_event_new_stream_start(data->track->id().utf8().data());
>+        gst_event_set_group_id(stream_start, 1);
>+        gst_event_unref(event);
>+
>+        gst_pad_push_event(pad, stream_start);
>+        gst_pad_push_event(pad, gst_event_new_stream_collection(self->streamCollection.get()));
>+        gst_pad_push_event(pad, gst_event_new_tag(mediaStreamTrackPrivateGetTags(data->track.get())));
>+
>+        webkitMediaStreamSrcAddPad(self, pad, data->pad_template);
>+
>+        return GST_PAD_PROBE_HANDLED;
>+    }
>+    default:
>+        break;
>+    }
>+
>+    return GST_PAD_PROBE_OK;
>+}
>+
>+static gboolean webkitMediaStreamSrcSetupSrc(WebKitMediaStreamSrc* self,
>+    MediaStreamTrackPrivate* track, GstElement* element,
>+    GstStaticPadTemplate* pad_template, gboolean observe_track)
>+{
>+    auto pad = adoptGRef(gst_element_get_static_pad(element, "src"));
>+
>+    gst_bin_add(GST_BIN(self), element);
>+
>+
>+    ProbeData* data = new ProbeData;
>+    data->self = WEBKIT_MEDIA_STREAM_SRC(self);
>+    data->pad_template = pad_template;
>+    data->track = track;
>+
>+    self->probeid = gst_pad_add_probe(pad.get(), (GstPadProbeType)GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
>+        (GstPadProbeCallback)webkitMediaStreamSrcPadProbeCb, data,
>+        [](gpointer data) {
>+            delete (ProbeData*)data;
>+        });
>+
>+    if (observe_track)
>+        track->addObserver(*self->observer.get());
>+
>+    gst_element_sync_state_with_parent(element);
>+    return TRUE;
>+}
>+
>+static gboolean webkitMediaStreamSrcSetupAppSrc(WebKitMediaStreamSrc* self,
>+    MediaStreamTrackPrivate* track, GstElement** element,
>+    GstStaticPadTemplate* pad_template)
>+{
>+    *element = gst_element_factory_make("appsrc", nullptr);
>+    g_object_set(*element, "is-live", true, "format", GST_FORMAT_TIME, nullptr);
>+
>+    return webkitMediaStreamSrcSetupSrc(self, track, *element, pad_template, TRUE);
>+}
>+
>+static void webkitMediaStreamSrcPostStreamCollection(WebKitMediaStreamSrc* self, MediaStreamPrivate* stream)
>+{
>+    GST_OBJECT_LOCK(self);
>+    self->streamCollection = adoptGRef(gst_stream_collection_new(stream->id().utf8().data()));
>+    for (auto& track : stream->tracks()) {
>+        auto gststream = webkitMediaStreamNew(track.get());
>+
>+        gst_stream_collection_add_stream(self->streamCollection.get(), gststream);
>+    }
>+    GST_OBJECT_UNLOCK(self);
>+
>+    gst_element_post_message(GST_ELEMENT(self),
>+        gst_message_new_stream_collection(GST_OBJECT(self), self->streamCollection.get()));
>+}
>+
>+gboolean webkitMediaStreamSrcSetStream(WebKitMediaStreamSrc* self, MediaStreamPrivate* stream)
>+{
>+    g_return_val_if_fail(WEBKIT_IS_MEDIA_STREAM_SRC(self), FALSE);
>+
>+    if (self->audioSrc) {
>+        gst_element_set_state(self->audioSrc, GST_STATE_NULL);
>+        gst_bin_remove(GST_BIN(self), self->audioSrc);
>+        self->audioSrc = nullptr;
>+    }
>+
>+    if (self->videoSrc) {
>+        gst_element_set_state(self->videoSrc, GST_STATE_NULL);
>+        gst_bin_remove(GST_BIN(self), self->videoSrc);
>+        self->videoSrc = nullptr;
>+    }
>+
>+    webkitMediaStreamSrcPostStreamCollection(self, stream);
>+
>+    self->stream = stream;
>+    for (auto& track : stream->tracks()) {
>+        if (track->type() == RealtimeMediaSource::Type::Audio) {
>+            webkitMediaStreamSrcSetupAppSrc(self, track.get(), &self->audioSrc,
>+                &audioSrcTemplate);
>+        } else if (track->type() == RealtimeMediaSource::Type::Video) {
>+            webkitMediaStreamSrcSetupAppSrc(self, track.get(), &self->videoSrc,
>+                &videoSrcTemplate);
>+        } else {
>+            GST_INFO("Unsuported track type: %d", (gint) track->type());
>+            continue;
>+        }
>+    }
>+
>+    return TRUE;
>+}
>+
>+static void webkitMediaStreamSrcPushVideoSample(WebKitMediaStreamSrc* self, GstSample* gstsample)
>+{
>+    if (self->videoSrc)
>+        gst_app_src_push_sample(GST_APP_SRC(self->videoSrc), gstsample);
>+}
>+
>+static void webkitMediaStreamSrcPushAudioSample(WebKitMediaStreamSrc* self, GstSample* gstsample)
>+{
>+    if (self->audioSrc)
>+        gst_app_src_push_sample(GST_APP_SRC(self->audioSrc), gstsample);
>+}
>+
>+static void webkitMediaStreamSrcTrackEnded(WebKitMediaStreamSrc* self,
>+    MediaStreamTrackPrivate& track)
>+{
>+    GRefPtr<GstPad> pad = nullptr;
>+
>+    GST_OBJECT_LOCK(self);
>+    for (auto tmp = GST_ELEMENT(self)->srcpads; tmp; tmp = tmp->next) {
>+        GstPad* tmppad = GST_PAD(tmp->data);
>+        const gchar* stream_id;
>+
>+        GstEvent* stream_start = gst_pad_get_sticky_event(tmppad, GST_EVENT_STREAM_START, 0);
>+        if (!stream_start)
>+            continue;
>+
>+        gst_event_parse_stream_start(stream_start, &stream_id);
>+        if (String(stream_id) == track.id()) {
>+            pad = tmppad;
>+            break;
>+        }
>+    }
>+    GST_OBJECT_UNLOCK(self);
>+
>+    if (!pad) {
>+        GST_ERROR_OBJECT(self, "No pad found for %s", track.id().utf8().data());
>+
>+        return;
>+    }
>+
>+    // Make sure that the video.videoWidth is reset to 0
>+    webkitMediaStreamSrcPostStreamCollection(self, self->stream.get());
>+    auto tags = mediaStreamTrackPrivateGetTags(&track);
>+    gst_pad_push_event(pad.get(), gst_event_new_tag(tags));
>+    gst_pad_push_event(pad.get(), gst_event_new_eos());
>+}
>+
>+} // WebCore
>+#endif // ENABLE(VIDEO) && ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.h
>new file mode 100644
>index 00000000000..eb4112e707f
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerMediaStreamSource.h
>@@ -0,0 +1,46 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(VIDEO) && ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC)
>+
>+#include "MediaStreamPrivate.h"
>+#include "MediaStreamTrackPrivate.h"
>+
>+#include <gst/gst.h>
>+
>+#define WEBKIT_MEDIA_TRACK_TAG_WIDTH "webkit-media-stream-width"
>+#define WEBKIT_MEDIA_TRACK_TAG_HEIGHT "webkit-media-stream-height"
>+#define WEBKIT_MEDIA_TRACK_TAG_KIND "webkit-media-stream-kind"
>+
>+namespace WebCore {
>+
>+typedef struct _WebKitMediaStreamSrc WebKitMediaStreamSrc;
>+
>+#define WEBKIT_MEDIA_STREAM_SRC(o) (G_TYPE_CHECK_INSTANCE_CAST((o), WEBKIT_TYPE_MEDIA_STREAM_SRC, WebKitMediaStreamSrc))
>+#define WEBKIT_IS_MEDIA_STREAM_SRC(o) (G_TYPE_CHECK_INSTANCE_TYPE((o), WEBKIT_TYPE_MEDIA_STREAM_SRC))
>+#define WEBKIT_TYPE_MEDIA_STREAM_SRC (webkit_media_stream_src_get_type())
>+GType webkit_media_stream_src_get_type(void) G_GNUC_CONST;
>+gboolean webkitMediaStreamSrcSetStream(WebKitMediaStreamSrc*, MediaStreamPrivate*);
>+} // WebCore
>+
>+#endif // ENABLE(VIDEO) && ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.cpp b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.cpp
>new file mode 100644
>index 00000000000..9ae1defb0cd
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.cpp
>@@ -0,0 +1,270 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+#include "GStreamerVideoCaptureSource.h"
>+
>+#include "GStreamerCaptureDeviceManager.h"
>+#include "MediaSampleGStreamer.h"
>+
>+#include <gst/app/gstappsink.h>
>+#include <webrtc/api/mediastreaminterface.h>
>+#include <webrtc/api/peerconnectioninterface.h>
>+#include <webrtc/media/base/videocommon.h>
>+#include <webrtc/media/engine/webrtcvideocapturer.h>
>+#include <webrtc/media/engine/webrtcvideocapturerfactory.h>
>+#include <webrtc/modules/video_capture/video_capture_defines.h>
>+
>+namespace WebCore {
>+
>+const static int defaultWidth = 640;
>+const static int defaultHeight = 480;
>+
>+GST_DEBUG_CATEGORY(webkit_video_capture_source_debug);
>+#define GST_CAT_DEFAULT webkit_video_capture_source_debug
>+
>+static void initializeGStreamerDebug()
>+{
>+    static std::once_flag debugRegisteredFlag;
>+    std::call_once(debugRegisteredFlag, [] {
>+        GST_DEBUG_CATEGORY_INIT(webkit_video_capture_source_debug, "webkitvideocapturesource", 0,
>+            "WebKit Video Capture Source.");
>+    });
>+}
>+
>+class GStreamerVideoCaptureSourceFactory final : public RealtimeMediaSource::VideoCaptureFactory {
>+public:
>+    CaptureSourceOrError createVideoCaptureSource(const CaptureDevice& device, const MediaConstraints* constraints) final
>+    {
>+        return GStreamerVideoCaptureSource::create(device.persistentId(), constraints);
>+    }
>+};
>+
>+RealtimeMediaSource::VideoCaptureFactory& libWebRTCVideoCaptureSourceFactory()
>+{
>+    static NeverDestroyed<GStreamerVideoCaptureSourceFactory> factory;
>+    return factory.get();
>+}
>+
>+CaptureSourceOrError GStreamerVideoCaptureSource::create(const String& deviceID, const MediaConstraints* constraints)
>+{
>+    auto device = GStreamerVideoCaptureDeviceManager::singleton().gstreamerDeviceWithUID(deviceID);
>+    if (!device) {
>+        auto errorMessage = String::format("GStreamerVideoCaptureSource::create(): GStreamer did not find the device: %s.", deviceID.utf8().data());
>+        return CaptureSourceOrError(WTFMove(errorMessage));
>+    }
>+
>+    auto source = adoptRef(*new GStreamerVideoCaptureSource(device.value()));
>+
>+    if (constraints) {
>+        auto result = source->applyConstraints(*constraints);
>+        if (result)
>+            return WTFMove(result.value().first);
>+    }
>+    return CaptureSourceOrError(WTFMove(source));
>+}
>+
>+RealtimeMediaSource::VideoCaptureFactory& GStreamerVideoCaptureSource::factory()
>+{
>+    return libWebRTCVideoCaptureSourceFactory();
>+}
>+
>+GStreamerVideoCaptureSource::GStreamerVideoCaptureSource(const String& deviceID, const String& name, const gchar *source_factory)
>+    : RealtimeMediaSource(deviceID, RealtimeMediaSource::Type::Video, name)
>+    , m_capturer(std::make_unique<GStreamerVideoCapturer>(source_factory))
>+{
>+    initializeGStreamerDebug();
>+}
>+
>+GStreamerVideoCaptureSource::GStreamerVideoCaptureSource(GStreamerCaptureDevice device)
>+    : RealtimeMediaSource(device.persistentId(), RealtimeMediaSource::Type::Video, device.label())
>+    , m_capturer(std::make_unique<GStreamerVideoCapturer>(device))
>+{
>+    initializeGStreamerDebug();
>+}
>+
>+GStreamerVideoCaptureSource::~GStreamerVideoCaptureSource()
>+{
>+}
>+
>+bool GStreamerVideoCaptureSource::applySize(const IntSize &size)
>+{
>+    m_capturer->setSize(size.width(), size.height());
>+
>+    return true;
>+}
>+
>+bool GStreamerVideoCaptureSource::applyFrameRate(double framerate)
>+{
>+    m_capturer->setFrameRate(framerate);
>+
>+    return true;
>+}
>+
>+void GStreamerVideoCaptureSource::startProducingData()
>+{
>+    m_capturer->setupPipeline();
>+    m_capturer->setSize(size().width(), size().height());
>+    m_capturer->setFrameRate(frameRate());
>+    g_signal_connect(m_capturer->sink(), "new-sample", G_CALLBACK(newSampleCallback), this);
>+    m_capturer->play();
>+}
>+
>+GstFlowReturn GStreamerVideoCaptureSource::newSampleCallback(GstElement* sink, GStreamerVideoCaptureSource* source)
>+{
>+    auto gstSample = adoptGRef(gst_app_sink_pull_sample(GST_APP_SINK(sink)));
>+    auto mediaSample = MediaSampleGStreamer::create(WTFMove(gstSample), WebCore::FloatSize(), String());
>+
>+    // FIXME - Check how presentationSize is supposed to be used here.
>+    callOnMainThread([protectedThis = makeRef(*source), mediaSample = WTFMove(mediaSample)] {
>+        protectedThis->videoSampleAvailable(mediaSample.get());
>+    });
>+
>+    return GST_FLOW_OK;
>+}
>+
>+void GStreamerVideoCaptureSource::stopProducingData()
>+{
>+    g_signal_handlers_disconnect_by_func(m_capturer->sink(), reinterpret_cast<gpointer>(newSampleCallback), this);
>+    m_capturer->stop();
>+
>+    GST_INFO("Reset height and width after stopping source");
>+    setHeight(0);
>+    setWidth(0);
>+}
>+
>+const RealtimeMediaSourceCapabilities& GStreamerVideoCaptureSource::capabilities() const
>+{
>+    if (m_capabilities)
>+        return m_capabilities.value();
>+
>+    RealtimeMediaSourceCapabilities capabilities(settings().supportedConstraints());
>+    GRefPtr<GstCaps> caps = adoptGRef(m_capturer->caps());
>+    int32_t minWidth = G_MAXINT32, maxWidth = 0, minHeight = G_MAXINT32, maxHeight = 0;
>+    double minFramerate = G_MAXDOUBLE, maxFramerate = G_MINDOUBLE;
>+
>+    for (guint i = 0; i < gst_caps_get_size(caps.get()); i++) {
>+        GstStructure* str = gst_caps_get_structure(caps.get(), i);
>+
>+        // Only accept raw video for now.
>+        if (!gst_structure_has_name(str, "video/x-raw"))
>+            continue;
>+
>+        int32_t tmpMinWidth, tmpMinHeight, tmpMinFPSNumerator, tmpMinFPSDenominator;
>+        int32_t tmpMaxWidth, tmpMaxHeight, tmpMaxFPSNumerator, tmpMaxFPSDenominator;
>+        double tmpMinFramerate = G_MAXDOUBLE, tmpMaxFramerate = G_MINDOUBLE;
>+
>+        if (!gst_structure_get(str, "width", GST_TYPE_INT_RANGE, &tmpMinWidth, &tmpMaxWidth, "height", GST_TYPE_INT_RANGE, &tmpMinHeight, &tmpMaxHeight, nullptr)) {
>+            if (!gst_structure_get(str, "width", G_TYPE_INT, &tmpMinWidth, "height", G_TYPE_INT, &tmpMinHeight, nullptr))
>+                continue;
>+
>+            tmpMaxWidth = tmpMinWidth;
>+            tmpMaxHeight = tmpMinHeight;
>+        }
>+
>+        if (gst_structure_get(str, "framerate", GST_TYPE_FRACTION_RANGE, &tmpMinFPSNumerator, &tmpMinFPSDenominator, &tmpMaxFPSNumerator, &tmpMaxFPSDenominator, nullptr)) {
>+            gst_util_fraction_to_double (tmpMinFPSNumerator, tmpMinFPSDenominator, &tmpMinFramerate);
>+            gst_util_fraction_to_double (tmpMaxFPSNumerator, tmpMaxFPSDenominator, &tmpMaxFramerate);
>+        } else if (gst_structure_get(str,
>+            "framerate", GST_TYPE_FRACTION, &tmpMinFPSNumerator, &tmpMinFPSDenominator, nullptr)) {
>+            tmpMaxFPSNumerator = tmpMinFPSNumerator;
>+            tmpMaxFPSDenominator = tmpMinFPSDenominator;
>+            gst_util_fraction_to_double (tmpMinFPSNumerator, tmpMinFPSDenominator, &tmpMinFramerate);
>+            gst_util_fraction_to_double (tmpMaxFPSNumerator, tmpMaxFPSDenominator, &tmpMaxFramerate);
>+        } else {
>+            const GValue* frameRates(gst_structure_get_value(str, "framerate"));
>+            tmpMinFramerate = G_MAXDOUBLE;
>+            tmpMaxFramerate = 0.0;
>+
>+            guint frameRatesLength = static_cast<guint>(gst_value_list_get_size(frameRates)) - 1;
>+
>+            for (guint i = 0; i < frameRatesLength; i++) {
>+                double tmpFrameRate;
>+                const GValue* val = gst_value_list_get_value(frameRates, i);
>+
>+                ASSERT(G_VALUE_TYPE(val) == GST_TYPE_FRACTION);
>+                gst_util_fraction_to_double (gst_value_get_fraction_numerator(val),
>+                    gst_value_get_fraction_denominator(val), &tmpFrameRate);
>+
>+                tmpMinFramerate = std::min(tmpMinFramerate, tmpFrameRate);
>+                tmpMaxFramerate = std::max(tmpMaxFramerate, tmpFrameRate);
>+            }
>+
>+            if (i > 0) {
>+                minWidth = std::min(tmpMinWidth, minWidth);
>+                minHeight = std::min(tmpMinHeight, minHeight);
>+                minFramerate = std::min(tmpMinFramerate, minFramerate);
>+
>+                maxWidth = std::max(tmpMaxWidth, maxWidth);
>+                maxHeight = std::max(tmpMaxHeight, maxHeight);
>+                maxFramerate = std::max(tmpMaxFramerate, maxFramerate);
>+            } else {
>+                minWidth = tmpMinWidth;
>+                minHeight = tmpMinHeight;
>+                minFramerate = tmpMinFramerate;
>+
>+                maxWidth = tmpMaxWidth;
>+                maxHeight = tmpMaxHeight;
>+                maxFramerate = tmpMaxFramerate;
>+            }
>+        }
>+
>+        capabilities.setDeviceId(id());
>+        capabilities.setWidth(CapabilityValueOrRange(minWidth, maxWidth));
>+        capabilities.setHeight(CapabilityValueOrRange(minHeight, maxHeight));
>+        capabilities.setFrameRate(CapabilityValueOrRange(minFramerate, maxFramerate));
>+        m_capabilities = WTFMove(capabilities);
>+    }
>+
>+    return m_capabilities.value();
>+}
>+
>+const RealtimeMediaSourceSettings& GStreamerVideoCaptureSource::settings() const
>+{
>+    if (!m_currentSettings) {
>+        RealtimeMediaSourceSettings settings;
>+        settings.setDeviceId(id());
>+
>+        RealtimeMediaSourceSupportedConstraints supportedConstraints;
>+        supportedConstraints.setSupportsDeviceId(true);
>+        supportedConstraints.setSupportsFacingMode(true);
>+        supportedConstraints.setSupportsWidth(true);
>+        supportedConstraints.setSupportsHeight(true);
>+        supportedConstraints.setSupportsAspectRatio(true);
>+        supportedConstraints.setSupportsFrameRate(true);
>+        settings.setSupportedConstraints(supportedConstraints);
>+
>+        m_currentSettings = WTFMove(settings);
>+    }
>+
>+    m_currentSettings->setWidth(size().width());
>+    m_currentSettings->setHeight(size().height());
>+    m_currentSettings->setFrameRate(frameRate());
>+    m_currentSettings->setAspectRatio(aspectRatio());
>+    m_currentSettings->setFacingMode(facingMode());
>+    return m_currentSettings.value();
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.h
>new file mode 100644
>index 00000000000..379ba7e0fd6
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCaptureSource.h
>@@ -0,0 +1,64 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+#include "GStreamerVideoCapturer.h"
>+#include "RealtimeMediaSource.h"
>+
>+namespace WebCore {
>+
>+class GStreamerVideoCaptureSource : public RealtimeMediaSource {
>+public:
>+    static CaptureSourceOrError create(const String& deviceID, const MediaConstraints*);
>+    WEBCORE_EXPORT static VideoCaptureFactory& factory();
>+
>+    const RealtimeMediaSourceCapabilities& capabilities() const override;
>+    const RealtimeMediaSourceSettings& settings() const override;
>+    GstElement* pipeline() { return m_capturer->pipeline(); }
>+    GStreamerCapturer* capturer() { return m_capturer.get(); }
>+
>+
>+protected:
>+    GStreamerVideoCaptureSource(const String& deviceID, const String& name, const gchar * source_factory);
>+    GStreamerVideoCaptureSource(GStreamerCaptureDevice);
>+    virtual ~GStreamerVideoCaptureSource();
>+    void startProducingData() override;
>+    void stopProducingData() override;
>+
>+    mutable std::optional<RealtimeMediaSourceCapabilities> m_capabilities;
>+    mutable std::optional<RealtimeMediaSourceSettings> m_currentSettings;
>+
>+private:
>+    static GstFlowReturn newSampleCallback(GstElement*, GStreamerVideoCaptureSource*);
>+
>+    bool isCaptureSource() const final { return true; }
>+    bool applySize(const IntSize&) final;
>+    bool applyFrameRate(double) final;
>+    bool applyAspectRatio(double) final { return true; }
>+
>+    std::unique_ptr<GStreamerVideoCapturer> m_capturer;
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.cpp b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.cpp
>new file mode 100644
>index 00000000000..88b6050216f
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.cpp
>@@ -0,0 +1,104 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+#include "GStreamerVideoCapturer.h"
>+
>+#include <gst/app/gstappsink.h>
>+
>+namespace WebCore {
>+
>+GStreamerVideoCapturer::GStreamerVideoCapturer(GStreamerCaptureDevice device)
>+    : GStreamerCapturer(device, adoptGRef(gst_caps_new_empty_simple("video/x-raw")))
>+{
>+}
>+
>+GStreamerVideoCapturer::GStreamerVideoCapturer(const char* sourceFactory)
>+    : GStreamerCapturer(sourceFactory, adoptGRef(gst_caps_new_empty_simple("video/x-raw")))
>+{
>+}
>+
>+GstElement* GStreamerVideoCapturer::createConverter()
>+{
>+    auto converter = gst_parse_bin_from_description("videoscale ! videoconvert ! videorate", TRUE, nullptr);
>+
>+    ASSERT(converter);
>+
>+    return converter;
>+}
>+
>+GstVideoInfo GStreamerVideoCapturer::getBestFormat()
>+{
>+    GRefPtr<GstCaps> caps = adoptGRef(gst_caps_fixate(gst_device_get_caps(m_device.get())));
>+    GstVideoInfo info;
>+    gst_video_info_from_caps(&info, caps.get());
>+
>+    return info;
>+}
>+
>+bool GStreamerVideoCapturer::setSize(int width, int height)
>+{
>+    if (!width || !height)
>+        return false;
>+
>+    m_caps = adoptGRef(gst_caps_copy(m_caps.get()));
>+    gst_caps_set_simple(m_caps.get(), "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, nullptr);
>+
>+    if (!m_capsfilter)
>+        return false;
>+
>+    g_object_set(m_capsfilter.get(), "caps", m_caps.get(), nullptr);
>+
>+    return true;
>+}
>+
>+bool GStreamerVideoCapturer::setFrameRate(double frameRate)
>+{
>+    int numerator, denominator;
>+
>+    gst_util_double_to_fraction(frameRate, &numerator, &denominator);
>+
>+    if (numerator < -G_MAXINT) {
>+        GST_INFO_OBJECT(m_pipeline.get(), "Framerate %f not allowed", frameRate);
>+        return false;
>+    }
>+
>+    if (!numerator) {
>+        GST_INFO_OBJECT(m_pipeline.get(), "Do not force variable framerate");
>+        return false;
>+    }
>+
>+    m_caps = adoptGRef(gst_caps_copy(m_caps.get()));
>+    gst_caps_set_simple(m_caps.get(), "framerate", GST_TYPE_FRACTION, numerator, denominator, nullptr);
>+
>+    if (!m_capsfilter)
>+        return false;
>+
>+    g_object_set(m_capsfilter.get(), "caps", m_caps.get(), nullptr);
>+
>+    return true;
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.h b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.h
>new file mode 100644
>index 00000000000..57b0b4686d3
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/GStreamerVideoCapturer.h
>@@ -0,0 +1,46 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+
>+#include "GStreamerCapturer.h"
>+
>+#include <gst/video/video.h>
>+
>+namespace WebCore {
>+
>+class GStreamerVideoCapturer : public GStreamerCapturer {
>+public:
>+    GStreamerVideoCapturer(GStreamerCaptureDevice);
>+    GStreamerVideoCapturer(const char* source_factory);
>+
>+    GstElement* createConverter() final;
>+    const char* name() final { return "Video"; }
>+
>+    bool setSize(int width, int height);
>+    bool setFrameRate(double);
>+    GstVideoInfo getBestFormat();
>+};
>+
>+} // namespace WebCore
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.cpp b/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.cpp
>new file mode 100644
>index 00000000000..995f05720eb
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.cpp
>@@ -0,0 +1,106 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+#include "MockGStreamerAudioCaptureSource.h"
>+
>+#include "MockRealtimeAudioSource.h"
>+
>+namespace WebCore {
>+
>+class WrappedMockRealtimeAudioSource : public MockRealtimeAudioSource {
>+public:
>+    WrappedMockRealtimeAudioSource(const String& deviceID, const String& name)
>+        : MockRealtimeAudioSource(deviceID, name)
>+    {
>+    }
>+};
>+
>+CaptureSourceOrError MockRealtimeAudioSource::create(const String& deviceID,
>+    const String& name, const MediaConstraints* constraints)
>+{
>+    auto source = adoptRef(*new MockGStreamerAudioCaptureSource(deviceID, name));
>+
>+    if (constraints && source->applyConstraints(*constraints))
>+        return { };
>+
>+    return CaptureSourceOrError(WTFMove(source));
>+}
>+
>+std::optional<std::pair<String, String>> MockGStreamerAudioCaptureSource::applyConstraints(const MediaConstraints& constraints)
>+{
>+    m_wrappedSource->applyConstraints(constraints);
>+    return GStreamerAudioCaptureSource::applyConstraints(constraints);
>+}
>+
>+void MockGStreamerAudioCaptureSource::applyConstraints(const MediaConstraints& constraints, SuccessHandler&& successHandler, FailureHandler&& failureHandler)
>+{
>+    m_wrappedSource->applyConstraints(constraints, WTFMove(successHandler), WTFMove(failureHandler));
>+}
>+
>+MockGStreamerAudioCaptureSource::MockGStreamerAudioCaptureSource(const String& deviceID, const String& name)
>+    : GStreamerAudioCaptureSource(deviceID, name)
>+    , m_wrappedSource(std::make_unique<WrappedMockRealtimeAudioSource>(deviceID, name))
>+{
>+    m_wrappedSource->addObserver(*this);
>+}
>+
>+MockGStreamerAudioCaptureSource::~MockGStreamerAudioCaptureSource()
>+{
>+    m_wrappedSource->removeObserver(*this);
>+}
>+
>+void MockGStreamerAudioCaptureSource::stopProducingData()
>+{
>+    m_wrappedSource->stop();
>+
>+    GStreamerAudioCaptureSource::stopProducingData();
>+}
>+
>+void MockGStreamerAudioCaptureSource::startProducingData()
>+{
>+    GStreamerAudioCaptureSource::startProducingData();
>+    m_wrappedSource->start();
>+}
>+
>+const RealtimeMediaSourceSettings& MockGStreamerAudioCaptureSource::settings() const
>+{
>+    return m_wrappedSource->settings();
>+}
>+
>+const RealtimeMediaSourceCapabilities& MockGStreamerAudioCaptureSource::capabilities() const
>+{
>+    m_capabilities = m_wrappedSource->capabilities();
>+    m_currentSettings = m_wrappedSource->settings();
>+    return m_wrappedSource->capabilities();
>+}
>+
>+void MockGStreamerAudioCaptureSource::captureFailed()
>+{
>+    stop();
>+    RealtimeMediaSource::captureFailed();
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.h b/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.h
>new file mode 100644
>index 00000000000..bc11f179b98
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerAudioCaptureSource.h
>@@ -0,0 +1,51 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro  <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+
>+#include "GStreamerAudioCaptureSource.h"
>+
>+namespace WebCore {
>+
>+class MockGStreamerAudioCaptureSource final : public GStreamerAudioCaptureSource, RealtimeMediaSource::Observer {
>+public:
>+    MockGStreamerAudioCaptureSource(const String& deviceID, const String& name);
>+    ~MockGStreamerAudioCaptureSource();
>+    std::optional<std::pair<String, String>> applyConstraints(const MediaConstraints&);
>+    void applyConstraints(const MediaConstraints&, SuccessHandler&&, FailureHandler&&) final;
>+
>+private:
>+    void stopProducingData() final;
>+    void startProducingData() final;
>+    const RealtimeMediaSourceSettings& settings() const final;
>+    const RealtimeMediaSourceCapabilities& capabilities() const final;
>+
>+    void captureFailed();
>+    std::unique_ptr<RealtimeMediaSource> m_wrappedSource;
>+
>+    void videoSampleAvailable(MediaSample&) override { };
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.cpp b/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.cpp
>new file mode 100644
>index 00000000000..bdfabedd46f
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.cpp
>@@ -0,0 +1,146 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+#include "MockGStreamerVideoCaptureSource.h"
>+
>+#include "MediaSampleGStreamer.h"
>+#include "MockRealtimeVideoSource.h"
>+
>+#include <gst/app/gstappsrc.h>
>+
>+namespace WebCore {
>+
>+class WrappedMockRealtimeVideoSource : public MockRealtimeVideoSource {
>+public:
>+    WrappedMockRealtimeVideoSource(const String& deviceID, const String& name)
>+        : MockRealtimeVideoSource(deviceID, name)
>+    {
>+    }
>+
>+    void updateSampleBuffer()
>+    {
>+        int fpsNumerator, fpsDenominator;
>+        auto imageBuffer = this->imageBuffer();
>+
>+        if (!imageBuffer)
>+            return;
>+
>+        gst_util_double_to_fraction(frameRate(), &fpsNumerator, &fpsDenominator);
>+        auto data = imageBuffer->toBGRAData();
>+        auto size = data.size();
>+        auto image_size = imageBuffer->internalSize();
>+        auto gstsample = gst_sample_new(gst_buffer_new_wrapped(static_cast<guint8*>(data.releaseBuffer().get()), size),
>+            adoptGRef(gst_caps_new_simple("video/x-raw",
>+                "format", G_TYPE_STRING, "BGRA",
>+                "width", G_TYPE_INT, image_size.width(),
>+                "height", G_TYPE_INT, image_size.height(),
>+                "framerate", GST_TYPE_FRACTION, fpsNumerator, fpsDenominator,
>+                nullptr)).get(),
>+            nullptr, nullptr);
>+
>+        auto sample = MediaSampleGStreamer::create(WTFMove(gstsample),
>+            WebCore::FloatSize(), String());
>+        videoSampleAvailable(sample);
>+    }
>+};
>+
>+CaptureSourceOrError MockRealtimeVideoSource::create(const String& deviceID,
>+    const String& name, const MediaConstraints* constraints)
>+{
>+    auto source = adoptRef(*new MockGStreamerVideoCaptureSource(deviceID, name));
>+
>+    if (constraints && source->applyConstraints(*constraints))
>+        return { };
>+
>+    return CaptureSourceOrError(WTFMove(source));
>+}
>+
>+void MockGStreamerVideoCaptureSource::startProducingData()
>+{
>+    GStreamerVideoCaptureSource::startProducingData();
>+    m_wrappedSource->start();
>+}
>+
>+void MockGStreamerVideoCaptureSource::stopProducingData()
>+{
>+    m_wrappedSource->stop();
>+
>+    GStreamerVideoCaptureSource::stopProducingData();
>+}
>+
>+void MockGStreamerVideoCaptureSource::videoSampleAvailable(MediaSample& sample)
>+{
>+    auto src = capturer()->source();
>+
>+    if (src) {
>+        auto gstsample = static_cast<MediaSampleGStreamer*>(&sample)->platformSample().sample.gstSample;
>+        gst_app_src_push_sample(GST_APP_SRC(src), gstsample);
>+    }
>+}
>+
>+MockGStreamerVideoCaptureSource::MockGStreamerVideoCaptureSource(const String& deviceID, const String& name)
>+    : GStreamerVideoCaptureSource(deviceID, name, "appsrc")
>+    , m_wrappedSource(std::make_unique<WrappedMockRealtimeVideoSource>(deviceID, name))
>+{
>+    m_wrappedSource->addObserver(*this);
>+}
>+
>+MockGStreamerVideoCaptureSource::~MockGStreamerVideoCaptureSource()
>+{
>+    m_wrappedSource->removeObserver(*this);
>+}
>+
>+std::optional<std::pair<String, String>> MockGStreamerVideoCaptureSource::applyConstraints(const MediaConstraints& constraints)
>+{
>+    m_wrappedSource->applyConstraints(constraints);
>+    return GStreamerVideoCaptureSource::applyConstraints(constraints);
>+}
>+
>+void MockGStreamerVideoCaptureSource::applyConstraints(const MediaConstraints& constraints, SuccessHandler&& successHandler, FailureHandler&& failureHandler)
>+{
>+    m_wrappedSource->applyConstraints(constraints, WTFMove(successHandler), WTFMove(failureHandler));
>+}
>+
>+const RealtimeMediaSourceSettings& MockGStreamerVideoCaptureSource::settings() const
>+{
>+    return m_wrappedSource->settings();
>+}
>+
>+const RealtimeMediaSourceCapabilities& MockGStreamerVideoCaptureSource::capabilities() const
>+{
>+    m_capabilities = m_wrappedSource->capabilities();
>+    m_currentSettings = m_wrappedSource->settings();
>+    return m_capabilities.value();
>+}
>+
>+void MockGStreamerVideoCaptureSource::captureFailed()
>+{
>+    stop();
>+
>+    RealtimeMediaSource::captureFailed();
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.h b/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.h
>new file mode 100644
>index 00000000000..dc802768d7f
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/MockGStreamerVideoCaptureSource.h
>@@ -0,0 +1,56 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>+
>+#include "GStreamerVideoCaptureSource.h"
>+#include "MockRealtimeMediaSource.h"
>+
>+namespace WebCore {
>+
>+class WrappedMockRealtimeVideoSource;
>+// We are subclassing GStreamerVideoCaptureSource and not MockRealtimeMediaSource
>+// because the MediaPlayer expects GStreamerVideoCaptureSource to be able to properly
>+// build the GStreamer pipeline. Still we make it so that it behaves as closely as possible
>+// to the MockRealtimeMediaSource class by wrapping our own subclass of it.
>+class MockGStreamerVideoCaptureSource final : public GStreamerVideoCaptureSource, RealtimeMediaSource::Observer {
>+public:
>+    MockGStreamerVideoCaptureSource(const String& deviceID, const String& name);
>+    ~MockGStreamerVideoCaptureSource();
>+    std::optional<std::pair<String, String>> applyConstraints(const MediaConstraints&);
>+    void applyConstraints(const MediaConstraints&, SuccessHandler&&, FailureHandler&&) final;
>+
>+private:
>+    void stopProducingData() final;
>+    void startProducingData() final;
>+    const RealtimeMediaSourceSettings& settings() const final;
>+    std::unique_ptr<RealtimeMediaSource> m_wrappedSource;
>+    const RealtimeMediaSourceCapabilities& capabilities() const final;
>+    void captureFailed() override;
>+
>+    void videoSampleAvailable(MediaSample&) override;
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC) && USE(GSTREAMER)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.cpp b/Source/WebCore/platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.cpp
>new file mode 100644
>index 00000000000..bdce1d6e60f
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.cpp
>@@ -0,0 +1,91 @@
>+/*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#include "config.h"
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC)
>+#include "RealtimeMediaSourceCenterLibWebRTC.h"
>+
>+#include "GStreamerAudioCaptureSource.h"
>+#include "GStreamerCaptureDevice.h"
>+#include "GStreamerCaptureDeviceManager.h"
>+#include "GStreamerVideoCaptureSource.h"
>+#include <wtf/MainThread.h>
>+
>+namespace WebCore {
>+
>+RealtimeMediaSource::AudioCaptureFactory& RealtimeMediaSourceCenterLibWebRTC::audioCaptureSourceFactory()
>+{
>+    return RealtimeMediaSourceCenterLibWebRTC::singleton().audioFactory();
>+}
>+
>+RealtimeMediaSourceCenterLibWebRTC& RealtimeMediaSourceCenterLibWebRTC::singleton()
>+{
>+    ASSERT(isMainThread());
>+    static NeverDestroyed<RealtimeMediaSourceCenterLibWebRTC> center;
>+    return center;
>+}
>+
>+RealtimeMediaSourceCenter& RealtimeMediaSourceCenter::platformCenter()
>+{
>+    return RealtimeMediaSourceCenterLibWebRTC::singleton();
>+}
>+
>+RealtimeMediaSourceCenterLibWebRTC::RealtimeMediaSourceCenterLibWebRTC()
>+    : m_libWebRTCProvider(LibWebRTCProvider::create())
>+{
>+}
>+
>+RealtimeMediaSourceCenterLibWebRTC::~RealtimeMediaSourceCenterLibWebRTC()
>+{
>+}
>+
>+RealtimeMediaSource::AudioCaptureFactory& RealtimeMediaSourceCenterLibWebRTC::audioFactory()
>+{
>+    if (m_audioFactoryOverride)
>+        return *m_audioFactoryOverride;
>+
>+    return GStreamerAudioCaptureSource::factory();
>+}
>+
>+RealtimeMediaSource::VideoCaptureFactory& RealtimeMediaSourceCenterLibWebRTC::videoFactory()
>+{
>+    return GStreamerVideoCaptureSource::factory();
>+}
>+
>+CaptureDeviceManager& RealtimeMediaSourceCenterLibWebRTC::audioCaptureDeviceManager()
>+{
>+    return GStreamerAudioCaptureDeviceManager::singleton();
>+}
>+
>+CaptureDeviceManager& RealtimeMediaSourceCenterLibWebRTC::videoCaptureDeviceManager()
>+{
>+    return GStreamerVideoCaptureDeviceManager::singleton();
>+}
>+
>+CaptureDeviceManager& RealtimeMediaSourceCenterLibWebRTC::displayCaptureDeviceManager()
>+{
>+    return GStreamerDisplayCaptureDeviceManager::singleton();
>+}
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC)
>diff --git a/Source/WebCore/platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.h b/Source/WebCore/platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.h
>new file mode 100644
>index 00000000000..921284e1780
>--- /dev/null
>+++ b/Source/WebCore/platform/mediastream/gstreamer/RealtimeMediaSourceCenterLibWebRTC.h
>@@ -0,0 +1,68 @@
>+ /*
>+ * Copyright (C) 2018 Metrological Group B.V.
>+ * Author: Thibault Saunier <tsaunier@igalia.com>
>+ * Author: Alejandro G. Castro <alex@igalia.com>
>+ *
>+ * This library is free software; you can redistribute it and/or
>+ * modify it under the terms of the GNU Library General Public
>+ * License as published by the Free Software Foundation; either
>+ * version 2 of the License, or (at your option) any later version.
>+ *
>+ * This library is distributed in the hope that it will be useful,
>+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
>+ * Library General Public License for more details.
>+ *
>+ * You should have received a copy of the GNU Library General Public License
>+ * aint with this library; see the file COPYING.LIB.  If not, write to
>+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
>+ * Boston, MA 02110-1301, USA.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC)
>+
>+#include "CaptureDeviceManager.h"
>+#include "LibWebRTCProvider.h"
>+#include "RealtimeMediaSource.h"
>+#include "RealtimeMediaSourceCenter.h"
>+
>+#include <webrtc/api/peerconnectioninterface.h>
>+#include <wtf/RefPtr.h>
>+#include <wtf/text/WTFString.h>
>+
>+namespace WebCore {
>+
>+class RealtimeMediaSourceCenterLibWebRTC final : public RealtimeMediaSourceCenter {
>+public:
>+    WEBCORE_EXPORT static RealtimeMediaSourceCenterLibWebRTC& singleton();
>+
>+    webrtc::PeerConnectionFactoryInterface* factory() { return m_libWebRTCProvider->factory(); }
>+
>+    static RealtimeMediaSource::VideoCaptureFactory& videoCaptureSourceFactory();
>+    static RealtimeMediaSource::AudioCaptureFactory& audioCaptureSourceFactory();
>+
>+private:
>+    friend class NeverDestroyed<RealtimeMediaSourceCenterLibWebRTC>;
>+    RealtimeMediaSourceCenterLibWebRTC();
>+    ~RealtimeMediaSourceCenterLibWebRTC();
>+
>+    void setAudioFactory(RealtimeMediaSource::AudioCaptureFactory& factory) final { m_audioFactoryOverride = &factory; }
>+    void unsetAudioFactory(RealtimeMediaSource::AudioCaptureFactory&) final { m_audioFactoryOverride = nullptr; }
>+
>+    RealtimeMediaSource::AudioCaptureFactory& audioFactory() final;
>+    RealtimeMediaSource::VideoCaptureFactory& videoFactory() final;
>+
>+    CaptureDeviceManager& audioCaptureDeviceManager() final;
>+    CaptureDeviceManager& videoCaptureDeviceManager() final;
>+    CaptureDeviceManager& displayCaptureDeviceManager() final;
>+
>+    RealtimeMediaSource::AudioCaptureFactory* m_audioFactoryOverride { nullptr };
>+    UniqueRef<LibWebRTCProvider> m_libWebRTCProvider;
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE(MEDIA_STREAM) && USE(LIBWEBRTC)
>+
>diff --git a/Source/WebCore/platform/mock/MockRealtimeAudioSource.cpp b/Source/WebCore/platform/mock/MockRealtimeAudioSource.cpp
>index c50abcb7a32..9c6024e53a8 100644
>--- a/Source/WebCore/platform/mock/MockRealtimeAudioSource.cpp
>+++ b/Source/WebCore/platform/mock/MockRealtimeAudioSource.cpp
>@@ -55,7 +55,7 @@ public:
>     }
> };
> 
>-#if !PLATFORM(MAC) && !PLATFORM(IOS)
>+#if !PLATFORM(MAC) && !PLATFORM(IOS) && !(USE(GSTREAMER) && USE(LIBWEBRTC))
> CaptureSourceOrError MockRealtimeAudioSource::create(const String& deviceID, const String& name, const MediaConstraints* constraints)
> {
>     auto source = adoptRef(*new MockRealtimeAudioSource(deviceID, name));
>diff --git a/Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp b/Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp
>index 9e860d6cf5a..ededa83a0e3 100644
>--- a/Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp
>+++ b/Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp
>@@ -82,7 +82,7 @@ private:
> #endif
> };
> 
>-#if !PLATFORM(MAC) && !PLATFORM(IOS)
>+#if !PLATFORM(MAC) && !PLATFORM(IOS) && !(USE(GSTREAMER) && USE(LIBWEBRTC))
> CaptureSourceOrError MockRealtimeVideoSource::create(const String& deviceID, const String& name, const MediaConstraints* constraints)
> {
>     auto source = adoptRef(*new MockRealtimeVideoSource(deviceID, name));
>diff --git a/Tools/ChangeLog b/Tools/ChangeLog
>index e2d4218a522..41d3b29f965 100644
>--- a/Tools/ChangeLog
>+++ b/Tools/ChangeLog
>@@ -1,3 +1,15 @@
>+2018-05-18  Thibault Saunier  <tsaunier@igalia.com>
>+
>+        [GTK][WPE] Start implementing MediaStream API
>+        https://bugs.webkit.org/show_bug.cgi?id=185787
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Scripts/webkitpy/style/checker.py: Apply special formatting rules for new GObject subclasses.
>+        * gstreamer/jhbuild.modules: Added a patch for the gst-plugins-base.
>+        * gstreamer/patches/gst-plugins-base-0001-parsebin-Post-STREAM_COLLECTION-on-EVENT_STREAM_COLL.patch:
>+        Added this fix to gst-plugings-base to fix the decodebin3. Merged as 89d0e9cc92a86aa0227ee87406737b6d31670aea
>+
> 2018-06-07  Fujii Hironori  <Hironori.Fujii@sony.com>
> 
>         [Win][MiniBrowser] Support multiple windows properly
>diff --git a/Tools/Scripts/webkitpy/style/checker.py b/Tools/Scripts/webkitpy/style/checker.py
>index 333dce26567..a5908e6016a 100644
>--- a/Tools/Scripts/webkitpy/style/checker.py
>+++ b/Tools/Scripts/webkitpy/style/checker.py
>@@ -207,6 +207,8 @@ _PATH_RULES_SPECIFIER = [
>       os.path.join('Source', 'WebCore', 'platform', 'graphics', 'gstreamer', 'VideoSinkGStreamer.cpp'),
>       os.path.join('Source', 'WebCore', 'platform', 'graphics', 'gstreamer', 'WebKitWebSourceGStreamer.cpp'),
>       os.path.join('Source', 'WebCore', 'platform', 'audio', 'gstreamer', 'WebKitWebAudioSourceGStreamer.cpp'),
>+      os.path.join('Source', 'WebCore', 'platform', 'mediastream', 'gstreamer', 'GStreamerMediaStreamSource.h'),
>+      os.path.join('Source', 'WebCore', 'platform', 'mediastream', 'gstreamer', 'GStreamerMediaStreamSource.cpp'),
>       os.path.join('Source', 'WebCore', 'platform', 'network', 'soup', 'ProxyResolverSoup.cpp'),
>       os.path.join('Source', 'WebCore', 'platform', 'network', 'soup', 'ProxyResolverSoup.h')],
>      ["-readability/naming",
>diff --git a/Tools/gstreamer/jhbuild.modules b/Tools/gstreamer/jhbuild.modules
>index 5aeb756ec0a..c90a0cb468c 100644
>--- a/Tools/gstreamer/jhbuild.modules
>+++ b/Tools/gstreamer/jhbuild.modules
>@@ -57,7 +57,9 @@
>     <dependencies>
>       <dep package="gstreamer"/>
>     </dependencies>
>-    <branch hash="sha:1026c7c3082d825d9b5d034c1a6dd8a4ebab60eb3738b0a0afde4ad2dc0b0db5" module="gst-plugins-base/gst-plugins-base-${version}.tar.xz" repo="gstreamer" version="1.14.1" />
>+    <branch hash="sha:1026c7c3082d825d9b5d034c1a6dd8a4ebab60eb3738b0a0afde4ad2dc0b0db5" module="gst-plugins-base/gst-plugins-base-${version}.tar.xz" repo="gstreamer" version="1.14.1" >
>+      <patch file="gst-plugins-base-0001-parsebin-Post-STREAM_COLLECTION-on-EVENT_STREAM_COLL.patch" strip="1"/> 
>+    </branch>
>   </autotools>
> 
>   <autotools id="gst-plugins-good" autogen-sh="configure" autogenargs="--disable-examples --disable-gtk-doc --disable-introspection">
>diff --git a/Tools/gstreamer/patches/gst-plugins-base-0001-parsebin-Post-STREAM_COLLECTION-on-EVENT_STREAM_COLL.patch b/Tools/gstreamer/patches/gst-plugins-base-0001-parsebin-Post-STREAM_COLLECTION-on-EVENT_STREAM_COLL.patch
>new file mode 100644
>index 00000000000..680bc2db464
>--- /dev/null
>+++ b/Tools/gstreamer/patches/gst-plugins-base-0001-parsebin-Post-STREAM_COLLECTION-on-EVENT_STREAM_COLL.patch
>@@ -0,0 +1,33 @@
>+From 89d0e9cc92a86aa0227ee87406737b6d31670aea Mon Sep 17 00:00:00 2001
>+From: Thibault Saunier <tsaunier@igalia.com>
>+Date: Wed, 18 Apr 2018 16:06:07 -0300
>+Subject: [PATCH] parsebin: Post STREAM_COLLECTION on EVENT_STREAM_COLLECTION
>+
>+Otherwise decodebin won't get notified about STREAM_COLLECTION comming
>+from the sources and thus will never get informored about it. Without
>+being informed about the stream collection decodebin won't be able to
>+select any streams. It ends up not creating any output for the streams
>+defined from outside parserbin.
>+
>+https://bugzilla.gnome.org/show_bug.cgi?id=795364
>+---
>+ gst/playback/gstparsebin.c | 3 +++
>+ 1 file changed, 3 insertions(+)
>+
>+diff --git a/gst/playback/gstparsebin.c b/gst/playback/gstparsebin.c
>+index 4c5bfc19d..f9662eb49 100644
>+--- a/gst/playback/gstparsebin.c
>++++ b/gst/playback/gstparsebin.c
>+@@ -4046,6 +4046,9 @@ gst_parse_pad_event (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
>+       GstStreamCollection *collection = NULL;
>+       gst_event_parse_stream_collection (event, &collection);
>+       gst_parse_pad_update_stream_collection (parsepad, collection);
>++      gst_element_post_message (GST_ELEMENT (parsepad->parsebin),
>++          gst_message_new_stream_collection (GST_OBJECT (parsepad->parsebin),
>++              collection));
>+       break;
>+     }
>+     case GST_EVENT_EOS:{
>+-- 
>+2.17.0
>+
>-- 
>2.17.1

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Attachments on bug 185787: 341758 | 342085 | 342160 | 342168 | 342187