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POReceiving kAUGraphErr_CannotDoInCurrentContext
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2012-05-11T11:20:19.030
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2012-05-11T11:20:19.030
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The line <code>AudioDeviceManager *manager = (__bridge AudioDeviceManager *)inRefCon;</code> is causing an EXC_BAD_ACCESS (code 1). The actual error is AudioUnitRender Failed: Unknown (-10863), which translates into kAUGraphErr_CannotDoInCurrentContext. Here's the callback where it's happening: <pre><code>static OSStatus playbackCallback(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList *ioData) { int i, j; if(startedCallback && noInterrupt) { //get a copy of the objectiveC class "self" AudioDeviceManager *manager = (__bridge AudioDeviceManager *)inRefCon; //data from input; 16 bit integer, one channel short signed int * source= (short signed int *)bufferList->mBuffers[0].mData; inNumberFrames= inNumberFrames<1025?inNumberFrames:1024; //pre created data stores float * inputbuf = manager->inputbuf; // shift old audio data memmove(inputbuf, inputbuf+inNumberFrames, sizeof(float)*(1024-inNumberFrames)); for (j = 0; j < inNumberFrames; j++) { inputbuf[j+1024-inNumberFrames] = source[j]*3.0518509475997e-05f; //conversion from 16 bit integer (range up to 32767 either side of 0.0) to float (-1.0 to 1.0) } manager->seq_cb(inputbuf, NULL, inNumberFrames, inTimeStamp, manager->seq); //loop through all the buffers that need to be filled ( in practice, will be one) for (i = 0 ; i < ioData->mNumberBuffers; i++){ //get the buffer to be filled AudioBuffer buffer = ioData->mBuffers[i]; //printf("which buf %d numberOfSamples %d channels %d countertest %d \n", i, buffer.mDataByteSize, buffer.mNumberChannels, g_countertest); //if needed we can get the number of bytes that will fill the buffer using // int numberOfSamples = ioData->mBuffers[i].mDataByteSize; //get the buffer and point to it as an UInt32 (as we will be filling it with 32 bit samples) //if we wanted we could grab it as a 16 bit and put in the samples for left and right seperately //but the loop below would be for(j = 0; j < inNumberFrames * 2; j++) as each frame is a 32 bit number //UInt32 *frameBuffer = buffer.mData; short signed int *frameBuffer = (short signed int *)buffer.mData; //loop through the buffer and fill the frames for (j = 0; j < inNumberFrames; j++){ //interleaved stereo, left then right frameBuffer[2*j] = 0; //mono output; later could have stereo effects frameBuffer[2*j+1] = 0; //++g_countertest; } } } else { //output zeroes while not ready to process input for (i = 0 ; i < ioData->mNumberBuffers; i++){ AudioBuffer buffer = ioData->mBuffers[i]; short signed int *frameBuffer = (short signed int *)buffer.mData; //loop through the buffer and fill the frames for (j = 0; j < inNumberFrames; j++){ short signed int value = 0; //32767.0*0.0; frameBuffer[2*j] = value; frameBuffer[2*j+1] = value; //++g_countertest; } } } return noErr; } </code></pre> I've found <a href="https://stackoverflow.com/questions/7354964/intermittent-crash-in-recordingcallback-on-app-launch">this</a>, which is a similar situation. The <a href="http://developer.apple.com/library/ios/#documentation/AudioToolbox/Reference/AUGraphServicesReference/Reference/reference.html#//apple_ref/doc/uid/TP40007289" rel="nofollow noreferrer">documentation</a> just says <blockquote> you can generally attempt the action again - typically the NEXT render cycle </blockquote> but every time the callback gets called the same exception is raised. Stack trace: <pre><code>Thread 6 name: AURemoteIO::IOThread Thread 6 Crashed: 0 libobjc.A.dylib 0x317bcf7a objc_retain + 10 1 Partyscape 0x0006cb36 _ZL16playbackCallbackPvPmPK14AudioTimeStampmmP15AudioBufferList (AudioDeviceManager.mm:80) 2 AudioToolbox 0x366a5326 AUInputElement::PullInput(unsigned long&, AudioTimeStamp const&, unsigned long, unsigned long) + 130 3 AudioToolbox 0x366aa6f6 AUInputFormatConverter2::InputProc(OpaqueAudioConverter*, unsigned long*, AudioBufferList*, AudioStreamPacketDescription**, void*) + 154 4 AudioToolbox 0x3668f31e AudioConverterChain::CallInputProc(unsigned long) + 354 5 AudioToolbox 0x3668f074 AudioConverterChain::FillBufferFromInputProc(unsigned long*, CABufferList*) + 72 6 AudioToolbox 0x3668f01e BufferedAudioConverter::GetInputBytes(unsigned long, unsigned long&, CABufferList const*&) + 122 7 AudioToolbox 0x366aa5c2 CBRConverter::RenderOutput(CABufferList*, unsigned long, unsigned long&, AudioStreamPacketDescription*) + 74 8 AudioToolbox 0x3668ed4c BufferedAudioConverter::FillBuffer(unsigned long&, AudioBufferList&, AudioStreamPacketDescription*) + 180 9 AudioToolbox 0x3668ee92 AudioConverterChain::RenderOutput(CABufferList*, unsigned long, unsigned long&, AudioStreamPacketDescription*) + 86 10 AudioToolbox 0x3668ed4c BufferedAudioConverter::FillBuffer(unsigned long&, AudioBufferList&, AudioStreamPacketDescription*) + 180 11 AudioToolbox 0x3668eb22 AudioConverterFillComplexBuffer + 350 12 AudioToolbox 0x367549b0 AUInputFormatConverter2::PullAndConvertInput(AudioTimeStamp const&, unsigned long&, AudioBufferList&, AudioStreamPacketDescription*, bool&) + 104 13 AudioToolbox 0x366aa518 AUConverterBase::RenderBus(unsigned long&, AudioTimeStamp const&, unsigned long, unsigned long) + 896 14 AudioToolbox 0x36745376 AURemoteIO::RenderBus(unsigned long&, AudioTimeStamp const&, unsigned long, unsigned long) + 42 15 AudioToolbox 0x36757d84 AUBase::DoRenderBus(unsigned long&, AudioTimeStamp const&, unsigned long, AUOutputElement*, unsigned long, AudioBufferList&) + 184 16 AudioToolbox 0x3669002e AUBase::DoRender(unsigned long&, AudioTimeStamp const&, unsigned long, unsigned long, AudioBufferList&) + 438 17 AudioToolbox 0x3674592a AURemoteIO::PerformIO(unsigned int, unsigned int, XAudioTimeStamp const&, XAudioTimeStamp const&, int&) + 870 18 AudioToolbox 0x36745a90 AURIOCallbackReceiver_PerformIO + 192 19 AudioToolbox 0x3673ca1e _XPerformIO + 178 20 AudioToolbox 0x366a5cdc mshMIGPerform + 368 21 AudioToolbox 0x36710b96 MSHMIGDispatchMessage + 22 22 AudioToolbox 0x367452ea AURemoteIO::IOThread::Run() + 58 23 AudioToolbox 0x36748f42 AURemoteIO::IOThread::Entry(void*) + 2 24 AudioToolbox 0x36685c9c CAPThread::Entry(CAPThread*) + 208 25 libsystem_c.dylib 0x3414172e _pthread_start + 314 26 libsystem_c.dylib 0x341415e8 thread_start + 0 </code></pre> In fact there is another AURemoteIO thread, and it looks like this: <pre><code>Thread 9 name: AURemoteIO::IOThread Thread 9: 0 libsystem_kernel.dylib 0x382dd004 mach_msg_trap + 20 1 libsystem_kernel.dylib 0x382dd1fa mach_msg + 50 2 AudioToolbox 0x36745312 AURemoteIO::IOThread::Run() + 98 3 AudioToolbox 0x36748f42 AURemoteIO::IOThread::Entry(void*) + 2 4 AudioToolbox 0x36685c9c CAPThread::Entry(CAPThread*) + 208 5 libsystem_c.dylib 0x3414172e _pthread_start + 314 6 libsystem_c.dylib 0x341415e8 thread_start + 0 </code></pre>
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<ios><core-audio>
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Receiving kAUGraphErr_CannotDoInCurrentContext
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