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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Web Audio ScriptProcessorNode pauses, emits hum after switching audio output device"
href="https://bugs.webkit.org/show_bug.cgi?id=169849">169849</a>
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<th>Summary</th>
<td>Web Audio ScriptProcessorNode pauses, emits hum after switching audio output device
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Macintosh
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<th>OS</th>
<td>macOS 10.12
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>Web Audio
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>bvibber@wikimedia.org
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<pre>We're using Web Audio's ScriptProcessorNode to play audio files that have been decoded in JavaScript dynamically; it works quite well except when the audio output device is changed during playback.
On my MacBook Pro running macOS 10.12.3, I can reproduce this by plugging or unplugging a USB speaker during playback; both directions produce similar results:
* audio stops on the old device
* on the new device, a humming noise may be emitted
* audioprocessing events are no longer delivered
When switching back to the original output device, audioprocessing events continue being delivered, and audio continues as expected.
Simplified test case: <a href="https://brionv.com/misc/audio.html">https://brionv.com/misc/audio.html</a>
Same results with Safari 10 release version, Technical Preview, and WebKit Nightly.</pre>
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