[Webkit-unassigned] [Bug 48012] Add AudioBufferSourceNode files

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=48012


Kenneth Russell <kbr at google.com> changed:

           What    |Removed                     |Added
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  Attachment #71344|review?                     |review-
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--- Comment #3 from Kenneth Russell <kbr at google.com>  2010-11-01 20:06:50 PST ---
(From update of attachment 71344)
View in context: https://bugs.webkit.org/attachment.cgi?id=71344&action=review

Overall the code basically looks good to a layman not experienced in audio processing. r- for a few minor issues, and a couple of larger / higher-level comments.

> WebCore/webaudio/AudioBufferSourceNode.cpp:83
> +    // Careful - this is a tryLock() and not an autolocker, so we must unlock() before every return.

Please consider adding a TryLocker class and MutexTryLocker typedef to WTF. The TryLocker class could have a bool holdsLock() method, and would only unlock the mutex in its destructor if it successfully acquired it in its constructor. This would clean up this class and I'm pretty sure a few others. This can be a separate bug following this one.

> WebCore/webaudio/AudioBufferSourceNode.cpp:145
> +    bool channelCountGood = numberOfChannels == busNumberOfChannels && (numberOfChannels == 1 || numberOfChannels == 2);

How about a FIXME here as below? This is the first case of this test in this file reading from the top down.

> WebCore/webaudio/AudioBufferSourceNode.cpp:264
> +    // FIXME: we can add support for sources with more than two channels, but this is not a common case.

Is it expected that it may be more of a common case in the future? Is there any real problem with generalizing this code to arrays of channels, source pointers, destination pointers, etc.? It seems it might cut in half the amount of code in certain places.

> WebCore/webaudio/AudioBufferSourceNode.cpp:280
> +    sourceR += m_readIndex;

Please add assertions that you're not walking off the end of the source, and won't when accessing framesToProcess frames past these pointers.

> WebCore/webaudio/AudioBufferSourceNode.cpp:405
> +void AudioBufferSourceNode::noteOff(double /*when*/)

Just remove the commented-out variable name.

> WebCore/webaudio/AudioBufferSourceNode.cpp:411
> +    // FIXME: when is ignored.

Put quotes around "when". Confusing to read otherwise.

> WebCore/webaudio/AudioBufferSourceNode.h:48
> +    static PassRefPtr<AudioBufferSourceNode> create(AudioContext* context, double sampleRate)

Is there a particular reason to inline this creation method in the header? If not please move its body to the .cpp.

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