48012 2010-10-20 15:01:23 -0700 Add AudioBufferSourceNode files 2010-11-02 19:36:03 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Other OS X 10.5 RESOLVED FIXED P2 Normal --- 0 crogers webkit-unassigned cmarrin commit-queue dglazkov eric.carlson jamesr jer.noble kbr simon.fraser oldest_to_newest 297056 0 crogers 2010-10-20 15:01:23 -0700 Add AudioBufferSourceNode files 297057 1 71344 crogers 2010-10-20 15:03:14 -0700 Created attachment 71344 Patch 297061 2 crogers 2010-10-20 15:06:57 -0700 This is the implementation for AudioBufferSourceNode as described in the audio specification: http://chromium.googlecode.com/svn/trunk/samples/audio/specification/specification.html#AudioBufferSourceNode-section 303181 3 71344 kbr 2010-11-01 20:06:50 -0700 Comment on attachment 71344 Patch 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. 303650 4 71344 crogers 2010-11-02 14:10:48 -0700 Comment on attachment 71344 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=71344&action=review >> 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. FIXED >> 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. Even in the future the mono and stereo cases will by far be the most common. It's important to keep the structure of the code such that the inner-loops may be optimized, especially for stereo. Fairly soon, we're anticipating adding automation curves and more generalized envelopes in here which can especially benefit from these optimizations. >> 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. FIXED: added this check in isSourceGood above >> WebCore/webaudio/AudioBufferSourceNode.cpp:405 >> +void AudioBufferSourceNode::noteOff(double /*when*/) > > Just remove the commented-out variable name. FIXED >> WebCore/webaudio/AudioBufferSourceNode.cpp:411 >> + // FIXME: when is ignored. > > Put quotes around "when". Confusing to read otherwise. FIXED >> 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. FIXED 303651 5 72734 crogers 2010-11-02 14:13:08 -0700 Created attachment 72734 Patch 303827 6 72734 kbr 2010-11-02 17:59:02 -0700 Comment on attachment 72734 Patch Looks good to me. 303863 7 72734 commit-queue 2010-11-02 19:35:57 -0700 Comment on attachment 72734 Patch Clearing flags on attachment: 72734 Committed r71205: <http://trac.webkit.org/changeset/71205> 303864 8 commit-queue 2010-11-02 19:36:03 -0700 All reviewed patches have been landed. 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