Re: AVAssetReader and Audio Queue streaming problem
Re: AVAssetReader and Audio Queue streaming problem
- Subject: Re: AVAssetReader and Audio Queue streaming problem
- From: Aran Mulholland <email@hidden>
- Date: Sat, 22 Jan 2011 21:07:37 +1100
Nick Collinsky has a working example here
called MusicLibraryRemoteIODemo.zip
On Sat, Jan 22, 2011 at 10:28 AM, Samuel Kitono
<email@hidden> wrote:
Hi Everyone,
I have a problem with the AVAssetReader here to get samples from the iPod library and stream it via Audio Queue. I have not been able to find any such example so I try to implement my own but it seems that somehow the AssetReader is "screwed up" at the callback function of audio queue. Specifically it fails when it does the copyNextSampleBuffer ie it returns null when it is not finished yet. I have made sure the pointer exists and such so it will be great if anyone can help.
Below is the callback function code that I have used. This callback function 'works' when it is not called by the AudioQueue callback.
static void HandleOutputBuffer (
void *playerStateH,
AudioQueueRef inAQ,
AudioQueueBufferRef inBuffer
) {
AQPlayerState *pplayerState = (AQPlayerState *) playerStateH;
//if (pplayerState->mIsRunning == 0) return;
UInt32 bytesToRead = pplayerState->bufferByteSize;
[[NSNotificationCenter defaultCenter] postNotificationName:NOTIF_callsample object:nil];
float * inData =(float *) inBuffer->mAudioData;
int offsetSample = 0;
//Loop until finish reading from the music data
while (bytesToRead) {
/*THIS IS THE PROBLEMATIC LINE*/
CMSampleBufferRef sampBuffer = [pplayerState->assetWrapper getNextSampleBuffer]; //the assetreader getting nextsample with copyNextSampleBuffer
if (sampBuffer == nil) {
NSLog(@"No more data to read from");
// NSLog(@"aro status after null %d",[pplayerState->ar status]);
AudioQueueStop (
pplayerState->mQueue,
false
);
pplayerState->mIsRunning = NO;
return;
}
AudioBufferList audioBufferList;
CMBlockBufferRef blockBuffer;
CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampBuffer, NULL, &audioBufferList, sizeof(audioBufferList), NULL, NULL, 0, &blockBuffer);
AudioBuffer audioBuffer = audioBufferList.mBuffers[0];
memcpy(inData + (2*offsetSample),audioBuffer.mData,audioBuffer.mDataByteSize);
bytesToRead = bytesToRead - audioBuffer.mDataByteSize;
offsetSample = offsetSample + audioBuffer.mDataByteSize/8;
}
inBuffer->mAudioDataByteSize = offsetSample*8;
AudioQueueEnqueueBuffer (
pplayerState->mQueue,
inBuffer,
0,
0
);
}
Thanks in advance for any assistance.
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