[Webkit-unassigned] [Bug 228140] New: [WebAudio] webm; properly trim frames according to the codec delay information

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228140

            Bug ID: 228140
           Summary: [WebAudio] webm; properly trim frames according to the
                    codec delay information
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jean-yves.avenard at apple.com
                CC: cdumez at apple.com

The webm metadata contains codec delay information, that specify how many audio frames should be trimmed at the start. This is used to properly deal with the Opus and Vorbis encoder delay behaviour that make them output silence for the first few packets.

Opus encoder delay is typically 45ms so we must drop that much from the start; otherwise that silence is audible and quite noticeable when you play the sound repeatedly.

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