[Webkit-unassigned] [Bug 238546] New: WebM Opus support still inconsistent in Safari 15.4

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238546

            Bug ID: 238546
           Summary: WebM Opus support still inconsistent in Safari 15.4
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com

Test URL: https://downloads.scirra.com/labs/audioCodecTests/

On Safari 15.4 on macOS 12.3, WebM Opus playback works correctly both with canPlayType(), <audio> and decodeAudioData.

On Safari 15.4 on iPadOS 15.4, WebM Opus playback is not detected with canPlayType(), does not play with <audio>, but it does actually work if passed to decodeAudioData.

Support for WebM Opus should be consistent across platforms - i.e. iPadOS should indicate it is supported with canPlayType() and allow it to be played with <audio>.

Note: since Web Audio does not provide any way to do feature detection for supported codecs, canPlayType() is the de facto way to test for Web Audio format support. So supporting a codec with decodeAudioData that does not indicate support in canPlayType() is more or less useless as no content will detect that it can use it with Web Audio.

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