mAudioData values

Subject: mAudioData values
From: Phillip Parker <email@hidden>
Date: Thu, 26 Apr 2012 21:48:35 +0100

Hello everyone,

I'm having a bit of trouble with the sample values returned from mAudioData. When I output the values to the console using this:

SInt16 *buf = (SInt16 *)inBuffer->mAudioData;

for(int i=0; i< inBuffer->mAudioDataByteSize / 2; i=i+2) {

printf("\n%d\n%d ", buf[i], buf[i+1]);

}

I receive sporadic results that don't match with results from Apple's SpeakHere example. I can record and play fine but the values are just odd. Any help or an insight into the problem would be greatly appreciated. Here's the callback function i'm using if it helps debug:

static void HandleInputBuffer (

void *aqData,

AudioQueueRef inAQ,

AudioQueueBufferRef inBuffer,

const AudioTimeStamp *inStartTime,

UInt32 inNumPackets,

const AudioStreamPacketDescription *inPacketDesc

) {

RecordState *pAqData = (RecordState *) aqData;

if (inNumPackets == 0 &&

pAqData->dataFormat.mBytesPerPacket != 0)

inNumPackets =

inBuffer->mAudioDataByteSize / pAqData->dataFormat.mBytesPerPacket;

SInt16 *buf = (SInt16 *)inBuffer->mAudioData;

for(int i=0; i< inBuffer->mAudioDataByteSize / 2; i=i+2) {

printf("\n%d\n%d ", buf[i], buf[i+1]);

}

if (AudioFileWritePackets (

pAqData->audioFile,

NO,

inBuffer->mAudioDataByteSize,

inPacketDesc,

pAqData->currentPacket,

&inNumPackets,

inBuffer->mAudioData

) == noErr) {

pAqData->currentPacket += inNumPackets;

if (pAqData->recording == 0)

return;

AudioQueueEnqueueBuffer (

pAqData->queue,

inBuffer,

NULL

);

}

Many Thanks!

Phill

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