core audio callback, inTimeStamp at the beginning or end of recording

Question

In core audio, when the recordingCallback is called:

static OSStatus recordingCallback(void *inRefCon, 
                              AudioUnitRenderActionFlags *ioActionFlags, 
                              const AudioTimeStamp *inTimeStamp, 
                              UInt32 inBusNumber, 
                              UInt32 inNumberFrames, 
                              AudioBufferList *ioData) {

does inTimeStamp reference the time when the audio began to be received or the time when the audio was finished being received.

was it

X if X is equal to the time when recording began

or

X + the buffer length

thank you,

nonono

score 2 · Accepted Answer · answered Apr 29 '11 at 12:12

2

The timestamp is for the time when the buffer was captured, specifically the bus time of the system (see this thread on the CoreAudio mailing list for details). So it would refer to the time in the first sample of the buffer, not the last sample.

answered Apr 29 '11 at 12:12

Nik Reiman

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Hi, what would inTimeStamp in the playback callback refer to – 123hal321 May 02 '11 at 07:11

core audio callback, inTimeStamp at the beginning or end of recording

1 Answers1