Hi, I've been struggling playing multiple AUFilePlayers at the same time.
I use an AUGraph and setup all my AUFilePlayer regions like this: memset(&audio_file_region_.mTimeStamp, 0, sizeof(audio_file_region_.mTimeStamp)); audio_file_region_.mTimeStamp.mFlags = kAudioTimeStampSampleTimeValid; audio_file_region_.mTimeStamp.mSampleTime = 0; audio_file_region_.mCompletionProc = NULL; audio_file_region_.mCompletionProcUserData = NULL; audio_file_region_.mAudioFile = audio_file_ID; audio_file_region_.mLoopCount = 0; audio_file_region_.mStartFrame = 0; audio_file_region_.mFramesToPlay = 0; Notice that the `mFramesToPlay = 0` because I Play/Pause/Stop from the AUFilePlayers and not the AUGraph. This way I start the graph but I start the playback when I want by using AUFilPlayer->Play(). Inside the Play() method I set the right number of frames for `mFramesToPlay` and the playback start. Everything works well this way. But now let's say I've 2 different AUFilePlayer called file_player_1 and file_player_2 which will play the same audio file. When I do something like this: // Do all the setup things file_player_1->Play(); file_player_2->Play(); I can hear the mix of my AUFilePlayer but I hear that the playbacks are phase shifted. I think it's because of the delay caused by `file_player_1->Play();` so before `file_player_2->Play();` is done the file_player_1 playback has already started… I looked at how to fix it and the workaround I found is to change the `kAudioUnitProperty_ScheduleStartTimeStamp` property. Instead of using `time_stamp_.mSampleTime = -1;` i.e start at the next render cycle I used `time_stamp_.mSampleTime = 0;` and it seems to work. But honestly I don't really know what "kAudioUnitProperty_ScheduleStartTimeStamp" do, and if it's the good way to play multiple AUFilePlayer playback in a sync since everybody uses `time_stamp_.mSampleTime = -1`. What would be your recommandation for this kind of behaviour? Thank you Laurent Noudohounsi.
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