[EME] Implement MediaKeys.isTypeSupported()

[Jer Noble]

[EME] Implement MediaKeys.isTypeSupported()

[Jer Noble]

Created attachment 208357 [details]
Patch

[Eric Carlson]

Comment on attachment 208357 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=208357&action=review

> Source/WebCore/Modules/encryptedmedia/MediaKeys.cpp:135
> +    // 1. If keySystem contains an unrecognized or unsupported Key System, return false and abort these steps.
> +    // Key system string comparison is case-sensitive.
> +    if (keySystem.isNull() || keySystem.isEmpty() || !CDM::supportsKeySystem(keySystem))
> +        return false;
> +
> +    // 2. If type is null or an empty string, return true and abort these steps.
> +    if (mimeType.isNull() || mimeType.isEmpty())
> +        return true;
> +
> +    // 3. If the Key System specified by keySystem does not support decrypting the container and/or codec
> +    // specified by type, return false and abort these steps.
> +    if (!CDM::supportsKeySystemAndMimeType(keySystem, mimeType))
> +        return false;

Nit: it would be nice if this didn't have to ask the CDM if it supports the key system twice.

[Jer Noble]

Committed r153838: <http://trac.webkit.org/changeset/153838>

[Jer Noble]

<rdar://problem/14688350>

[Chris Dumez]

Comment on attachment 208357 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=208357&action=review

> Source/WebCore/Modules/encryptedmedia/MediaKeys.cpp:125
> +    if (keySystem.isNull() || keySystem.isEmpty() || !CDM::supportsKeySystem(keySystem))

nit: The call to isNull() is redundant because it is already included in isEmpty().

> Source/WebCore/Modules/encryptedmedia/MediaKeys.cpp:129
> +    if (mimeType.isNull() || mimeType.isEmpty())

Ditto