iOS - AudioUnitRender returned error -10876 on device, but running fine in simulator
iOS - AudioUnitRender returned error -10876 on device, but running fine in simulator
- Subject: iOS - AudioUnitRender returned error -10876 on device, but running fine in simulator
- From: "Brian Wang (TB)" <email@hidden>
- Date: Sat, 02 Apr 2011 01:24:32 +0800
Hello all,
I encountered a problem which made me unable to capture input signal
from microphone on the device (iPhone4). However, the code runs fine
in the simulator. The code was originally adopted from Apple's
MixerHostAudio class from MixerHost sample code. it runs fine both on
device and in simulator before I started adding code for capturing mic
input. Wondering if somebody could help me out. Thanks in advance!
Here is my inputRenderCallback function which feeds signal into mixer input:
//--------- CODE START
static OSStatus inputRenderCallback (
void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData) {
recorderStructPtr recorderStructPointer = (recorderStructPtr) inRefCon;
// ....
AudioUnitRenderActionFlags renderActionFlags;
err = AudioUnitRender(recorderStructPointer->iOUnit,
&renderActionFlags,
inTimeStamp,
1, // bus number for input
inNumberFrames,
recorderStructPointer->fInputAudioBuffer
);
// error returned is -10876
// ....
}
//--------- CODE END
Here is my related initialization code: Now I keep only 1 input in the
mixer, so the mixer seems redundant, but works fine before adding
input capture code.
//--------- CODE START
// Convenience function to allocate our audio buffers
- (AudioBufferList *)
allocateAudioBufferListByNumChannels:(UInt32)numChannels
withSize:(UInt32)size {
AudioBufferList* list;
UInt32 i;
list = (AudioBufferList*)calloc(1, sizeof(AudioBufferList) +
numChannels * sizeof(AudioBuffer));
if(list == NULL)
return nil;
list->mNumberBuffers = numChannels;
for(i = 0; i < numChannels; ++i) {
list->mBuffers[i].mNumberChannels = 1;
list->mBuffers[i].mDataByteSize = size;
list->mBuffers[i].mData = malloc(size);
if(list->mBuffers[i].mData == NULL) {
[self destroyAudioBufferList:list];
return nil;
}
}
return list;
}
// initialize audio buffer list for input capture
recorderStructInstance.fInputAudioBuffer = [self
allocateAudioBufferListByNumChannels:1 withSize:4096];
// I/O unit description
AudioComponentDescription iOUnitDescription;
iOUnitDescription.componentType = kAudioUnitType_Output;
iOUnitDescription.componentSubType = kAudioUnitSubType_RemoteIO;
iOUnitDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
iOUnitDescription.componentFlags = 0;
iOUnitDescription.componentFlagsMask = 0;
// Multichannel mixer unit description
AudioComponentDescription MixerUnitDescription;
MixerUnitDescription.componentType = kAudioUnitType_Mixer;
MixerUnitDescription.componentSubType =
kAudioUnitSubType_MultiChannelMixer;
MixerUnitDescription.componentManufacturer = kAudioUnitManufacturer_Apple;
MixerUnitDescription.componentFlags = 0;
MixerUnitDescription.componentFlagsMask = 0;
AUNode iONode; // node for I/O unit
AUNode mixerNode; // node for Multichannel Mixer unit
// Add the nodes to the audio processing graph
result = AUGraphAddNode (
processingGraph,
&iOUnitDescription,
&iONode);
result = AUGraphAddNode (
processingGraph,
&MixerUnitDescription,
&mixerNode
);
result = AUGraphOpen (processingGraph);
// fetch mixer AudioUnit instance
result = AUGraphNodeInfo (
processingGraph,
mixerNode,
NULL,
&mixerUnit
);
// fetch RemoteIO AudioUnit instance
result = AUGraphNodeInfo (
processingGraph,
iONode,
NULL,
&(recorderStructInstance.iOUnit)
);
// enable input of RemoteIO unit
UInt32 enableInput = 1;
AudioUnitElement inputBus = 1;
result = AudioUnitSetProperty(recorderStructInstance.iOUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
inputBus,
&enableInput,
sizeof(enableInput)
);
// setup mixer inputs
UInt32 busCount = 1;
result = AudioUnitSetProperty (
mixerUnit,
kAudioUnitProperty_ElementCount,
kAudioUnitScope_Input,
0,
&busCount,
sizeof (busCount)
);
UInt32 maximumFramesPerSlice = 4096;
result = AudioUnitSetProperty (
mixerUnit,
kAudioUnitProperty_MaximumFramesPerSlice,
kAudioUnitScope_Global,
0,
&maximumFramesPerSlice,
sizeof (maximumFramesPerSlice)
);
for (UInt16 busNumber = 0; busNumber < busCount; ++busNumber) {
// set up input callback
AURenderCallbackStruct inputCallbackStruct;
inputCallbackStruct.inputProc = &inputRenderCallback;
inputCallbackStruct.inputProcRefCon = &recorderStructInstance;
result = AUGraphSetNodeInputCallback (
processingGraph,
mixerNode,
busNumber,
&inputCallbackStruct
);
// set up stream format
AudioStreamBasicDescription mixerBusStreamFormat;
size_t bytesPerSample = sizeof (AudioUnitSampleType);
mixerBusStreamFormat.mFormatID = kAudioFormatLinearPCM;
mixerBusStreamFormat.mFormatFlags =
kAudioFormatFlagsAudioUnitCanonical;
mixerBusStreamFormat.mBytesPerPacket = bytesPerSample;
mixerBusStreamFormat.mFramesPerPacket = 1;
mixerBusStreamFormat.mBytesPerFrame = bytesPerSample;
mixerBusStreamFormat.mChannelsPerFrame = 2;
mixerBusStreamFormat.mBitsPerChannel = 8 * bytesPerSample;
mixerBusStreamFormat.mSampleRate = graphSampleRate;
result = AudioUnitSetProperty (
mixerUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
busNumber,
&mixerBusStreamFormat,
sizeof (mixerBusStreamFormat)
);
}
// set sample rate of mixer output
result = AudioUnitSetProperty (
mixerUnit,
kAudioUnitProperty_SampleRate,
kAudioUnitScope_Output,
0,
&graphSampleRate,
sizeof (graphSampleRate)
);
// connect mixer output to RemoteIO
result = AUGraphConnectNodeInput (
processingGraph,
mixerNode, // source node
0, // source node output bus number
iONode, // destination node
0 // desintation node input bus number
);
// initialize AudioGraph
result = AUGraphInitialize (processingGraph);
// start AudioGraph
result = AUGraphStart (processingGraph);
// enable mixer input
result = AudioUnitSetParameter (
mixerUnit,
kMultiChannelMixerParam_Enable,
kAudioUnitScope_Input,
0, // bus number
1, // on
0
);
//--------- CODE END
(This issue is also posted on StackOverflow:
http://stackoverflow.com/questions/5502170/ios-audiounitrender-returned-error-10876-on-device-but-running-fine-in-simula
)
Thanks!
Best regards,
Brian
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