[Webkit-unassigned] [Bug 219201] New: Poor resampling quality when using AudioContext sampleRate parameter

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219201

            Bug ID: 219201
           Summary: Poor resampling quality when using AudioContext
                    sampleRate parameter
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com
                CC: cdumez at apple.com

Testing Safari TP116 with the new unprefixed Web Audio API. When using the AudioContext constructor's sampleRate parameter to set a different sampleRate to the default, the playback quality is poor with clear audible glitches. Presumably it's not correctly resampling the audio output.

Demo URL: https://downloads.scirra.com/labs/bugs/audio-samplerate/

Steps to reproduce:
1. Observe the default sample rate, and select a different sample rate in the dropdown box.
Testing on a 2015 MacBook Pro, the default sample rate is 44100, so in this case I select 48000 as the sample rate to create.

2. Click "Create" to create an AudioContext at the chosen sample rate

3. Click "Play" a few times

Expected result:
Good playback quality regardless of the AudioContext sample rate

Observed result:
Poor playback quality when the AudioContext sample rate is not the default

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