Bug 214132 – [MSE][GStreamer] Remove m_appendPipelinesMap

• Component: WebKitGTK
• Status: RESOLVED FIXED

[Alicia Boya García]

m_appendPipelinesMap was owned by MediaPlayerPrivateGStreamerMSE but
was only used by MediaPlayerPrivateGStreamerMSE to clear it during
destruction, while the other uses were in
MediaSourceClientGStreamerMSE.

After analysis, it was found keeping a HashMap of AppendPipelines is not
necessary. An AppendPipeline only needs to be used by the SourceBuffer
receiving the muxed data: making AppendPipeline a member of
SourceBufferPrivateGStreamer reflects this dependency in a much
clearer way. No need for a HashMap of AppendPipeline's.

Moreso, there are no other users of AppendPipeline, which means
AppendPipeline doesn't need to be ref counted. This patch removes that
feature, using std::unique_ptr<AppendPipeline> for ownership instead.

This patch is a refactor: it doesn't introduce behavior changes and
it's covered by existing tests.

[Alicia Boya García]

Created attachment 403857 [details]
Patch

[Xabier Rodríguez Calvar]

Comment on attachment 403857 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=403857&action=review

> Source/WebCore/platform/graphics/gstreamer/mse/SourceBufferPrivateGStreamer.cpp:78
> +void SourceBufferPrivateGStreamer::finishCreation()
> +{
> +    // Initializing the append pipeline must happen after Ref<SourceBufferPrivateGStreamer> has been constructed and
> +    // adopted, otherwise the makeRef() below would crash on ASSERT(!m_adoptionIsRequired).
> +    ASSERT(!m_appendPipeline);
> +    m_appendPipeline = WTF::makeUnique<AppendPipeline>(m_client, makeRef(*this), m_playerPrivate);
> +}

You don't need this, just call relaxAdoptionRequirement() in SourceBufferPrivateGStreamer::SourceBufferPrivateGStreamer() and you should be good.

[Alicia Boya García]

Created attachment 403866 [details]
Patch for landing

[EWS]

Committed r264175: <https://trac.webkit.org/changeset/264175>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 403866 [details].