[Webkit-unassigned] [Bug 229251] New: [WebAudio/WebM] Incorrect number of frames returned if decoding frame rate doesn't match original

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229251

            Bug ID: 229251
           Summary: [WebAudio/WebM] Incorrect number of frames returned if
                    decoding frame rate doesn't match original
           Product: WebKit
           Version: Other
          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

When calling decodeAudioData with a context where a sampling rate set is different to the original content, the number of frames returned may be incorrect

STR:
1- Open https://jyavenard.github.io/htmltests/tests/webaudio/decodeAudioData.html
2- Select opus.webm as the file to use
3- Set the sampling rate to 44100
4- Press play

The numbers showing are 88254 frames 2.001224489795918
which indicates that we've returned 88254 frames and that the length of the blob decoded is over 2s

This file is originally encoded at 48kHz and is exactly 2s long. When forcing the content to be decoded at 44.1kHz we should be getting 88200 frames and a 2s duration.

Something is wrong in the resampling and the trimming.

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