61830 2011-05-31 17:57:23 -0700 Add AudioParam parameter scheduling implementation 2011-06-03 20:09:10 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 crogers crogers kbr thakis oldest_to_newest 413039 0 crogers 2011-05-31 17:57:23 -0700 Add AudioParam parameter scheduling implementation 413049 1 95525 crogers 2011-05-31 18:13:33 -0700 Created attachment 95525 Patch 413778 2 95525 kbr 2011-06-01 17:20:46 -0700 Comment on attachment 95525 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=95525&action=review This generally looks good though I do have a few questions, one high-level. Still, I'll mark this r+ to avoid blocking you. > Source/WebCore/webaudio/AudioParamTimeline.cpp:145 > + if (!m_eventsLock.tryLock()) { I know that similar trylocks are used elsewhere on the audio thread, but won't this lock have a pretty high chance of contention if the application is requesting animation of a lot of parameters? It seems to me that there will be a high risk of dropouts specifically due to this new mechanism. > Source/WebCore/webaudio/AudioParamTimeline.cpp:174 > + ASSERT(values); Can you add some assert about m_eventsLock being held here? > Source/WebCore/webaudio/AudioParamTimeline.cpp:221 > + float time2 = nextEvent ? nextEvent->time() : endTime + 1.0; ".0" suffix is probably unneeded here and in several places below and should be removed per style guide. 415079 3 crogers 2011-06-03 12:17:42 -0700 Committed r88037: <http://trac.webkit.org/changeset/88037> 415082 4 95525 crogers 2011-06-03 12:22:38 -0700 Comment on attachment 95525 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=95525&action=review >> Source/WebCore/webaudio/AudioParamTimeline.cpp:145 >> + if (!m_eventsLock.tryLock()) { > > I know that similar trylocks are used elsewhere on the audio thread, but won't this lock have a pretty high chance of contention if the application is requesting animation of a lot of parameters? It seems to me that there will be a high risk of dropouts specifically due to this new mechanism. Each parameter has its own lock, so having many parameters won't increase the risk. Also, the result of failing the tryLock will not be a "dropout" but simply a smooth continuation of using the previous parameter value. Any param change will happen the next render quantum delayed by only a few milliseconds. But even this will be a somewhat rare occurrence. >> Source/WebCore/webaudio/AudioParamTimeline.cpp:174 >> + ASSERT(values); > > Can you add some assert about m_eventsLock being held here? Not sure how to assert a Mutex being held. I'd rather not call tryLock() just to make sure it fails... >> Source/WebCore/webaudio/AudioParamTimeline.cpp:221 >> + float time2 = nextEvent ? nextEvent->time() : endTime + 1.0; > > ".0" suffix is probably unneeded here and in several places below and should be removed per style guide. FIXED 415367 5 thakis 2011-06-03 19:36:34 -0700 Hi this breaks the clang build thusly: clang:warning: argument unused during compilation: '-fobjc-exceptions' /b/build/slave/Mac_Clang__dbg_/build/src/third_party/WebKit/Source/WebCore/WebCore.gyp/../webaudio/AudioParamTimeline.cpp:231:39:error: operands of ? are integers of different signs: 'unsigned int' and 'int' [-Werror,-Wsign-compare] int nextEventType = nextEvent ? nextEvent->type() : -1 /* unknown */; Can you fix? 415369 6 crogers 2011-06-03 19:41:36 -0700 Ok, I'll try to fix this. 415373 7 crogers 2011-06-03 20:09:10 -0700 should be fixed now in: http://trac.webkit.org/changeset/88089 95525 2011-05-31 18:13:33 -0700 2011-06-03 12:22:38 -0700 Patch bug-61830-20110531181331.patch text/plain 35433 crogers SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDg3NzY1KQorKysgU291cmNlL1dlYkNvcmUvQ2hhbmdl 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