Make RealtimeIncomingAudioSourceCocoa preallocate audio buffer

[youenn fablet]

Make RealtimeIncomingAudioSourceCocoa preallocate audio buffer

[youenn fablet]

Created attachment 426223 [details]
Patch

[Eric Carlson]

Comment on attachment 426223 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=426223&action=review

> Source/WebCore/platform/mediastream/mac/RealtimeIncomingAudioSourceCocoa.cpp:66
> +    , m_numberOfChannels(1)

One channel is the most common configuration?

> Source/WebCore/platform/mediastream/mac/RealtimeIncomingAudioSourceCocoa.cpp:76
> +    if (sampleRate != m_sampleRate)
> +        return;
> +

Why do we bail if the sample rate changes, but not the number of channels?

You can remove the sample rate check in `if (!m_audioBufferList || m_sampleRate != sampleRate || m_numberOfChannels != numberOfChannels)`

[youenn fablet]

Comment on attachment 426223 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=426223&action=review

>> Source/WebCore/platform/mediastream/mac/RealtimeIncomingAudioSourceCocoa.cpp:66
>> +    , m_numberOfChannels(1)
> 
> One channel is the most common configuration?

Yes, as of now, codecs usually encode in mono.
I guess we could try to improve for stereo in the future.

>> Source/WebCore/platform/mediastream/mac/RealtimeIncomingAudioSourceCocoa.cpp:76
>> +
> 
> Why do we bail if the sample rate changes, but not the number of channels?
> 
> You can remove the sample rate check in `if (!m_audioBufferList || m_sampleRate != sampleRate || m_numberOfChannels != numberOfChannels)`

LibWebRTC initially sends 16KHz data a few times before switching to 48KHz, not sure why.
I will remove below sample check.

[youenn fablet]

Created attachment 426403 [details]
Patch for landing

[EWS]

Committed r276245 (236727@main): <https://commits.webkit.org/236727@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 426403 [details].

[Radar WebKit Bug Importer]

<rdar://problem/77110055>