aurioTouch2 recording issue. I need to add data from one AudioBufferList to another - iphone

Question

I investigate aurioTouch2 sample code. But I wanna record everything in file. aurioTouch doesn't provide this possibility. I tried to record data using this code in FFTBufferManager.cpp in void FFTBufferManager::GrabAudioData(AudioBufferList *inBL)
ExtAudioFileRef cafFile;
AudioStreamBasicDescription cafDesc;
cafDesc.mBitsPerChannel = 16;
cafDesc.mBytesPerFrame = 4;
cafDesc.mBytesPerPacket = 4;
cafDesc.mChannelsPerFrame = 2;
cafDesc.mFormatFlags = 0;
cafDesc.mFormatID = 'ima4';
cafDesc.mFramesPerPacket = 1;
cafDesc.mReserved = 0;
cafDesc.mSampleRate = 44100;
CFStringRef refH;
refH = CFStringCreateWithCString(kCFAllocatorDefault, "/var/mobile/Applications/BD596ECF-A6F2-41EB-B4CE-3A9644B1C26A/Documents/voice2.caff", kCFStringEncodingUTF8);
CFURLRef destinationURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
refH,
kCFURLPOSIXPathStyle,
false);
OSType status = ExtAudioFileCreateWithURL(
destinationURL, // inURL
'caff', // inFileType
&cafDesc, // inStreamDesc
NULL, // inChannelLayout
kAudioFileFlags_EraseFile, // inFlags
&cafFile // outExtAudioFile
); // returns 0xFFFFFFCE
ExtAudioFileWrite(cafFile, mNumberFrames, inBL);
And this works well, but I use AudioBufferList *inBL, and this is only small part of all audio data (about 1 second). This functions is called every 1 second to analize new audion data from microphone. So it would be great, if I can add data from one AudioBufferList to another AudioBufferList.
Or may be anybody know other approach.

Answer 1

You whould set up new AudioUnit to record audio (with its own callback function).
OSStatus status;
// Describe audio component
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_RemoteIO;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
// Get component
AudioComponent inputComponent = AudioComponentFindNext(NULL, &desc);
// Get audio units
status = AudioComponentInstanceNew(inputComponent, &mAudioUnit);
// Enable IO for recording
UInt32 flag = 1;
status = AudioUnitSetProperty(mAudioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
kInputBus,
&flag,
sizeof(flag));
// Enable IO for playback
status = AudioUnitSetProperty(mAudioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output,
kOutputBus,
&flag,
sizeof(flag));
// Describe format
AudioStreamBasicDescription audioFormat={0};
audioFormat.mSampleRate = kSampleRate;
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
audioFormat.mFramesPerPacket = 1;
audioFormat.mChannelsPerFrame = 1;
audioFormat.mBitsPerChannel = 16;
audioFormat.mBytesPerPacket = 2;
audioFormat.mBytesPerFrame = 2;
// Apply format
status = AudioUnitSetProperty(mAudioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
kInputBus,
&audioFormat,
sizeof(audioFormat));
status = AudioUnitSetProperty(mAudioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input,
kOutputBus,
&audioFormat,
sizeof(audioFormat));
// Set input callback
AURenderCallbackStruct callbackStruct;
callbackStruct.inputProc = recordingCallback;
callbackStruct.inputProcRefCon = (__bridge void *)self;
status = AudioUnitSetProperty(mAudioUnit,
kAudioOutputUnitProperty_SetInputCallback,
kAudioUnitScope_Global,
kInputBus,
&callbackStruct,
sizeof(callbackStruct));
// Disable buffer allocation for the recorder (optional - do this if we want to pass in our own)
flag = 0;
status = AudioUnitSetProperty(mAudioUnit,
kAudioUnitProperty_ShouldAllocateBuffer,
kAudioUnitScope_Output,
kInputBus,
&flag,
sizeof(flag));
// On initialise le fichier audio
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *destinationFilePath = [[NSString alloc] initWithFormat: #"%#/output.caf", documentsDirectory];
NSLog(#">>> %#\n", destinationFilePath);
CFURLRef destinationURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (__bridge CFStringRef)destinationFilePath, kCFURLPOSIXPathStyle, false);
OSStatus setupErr = ExtAudioFileCreateWithURL(destinationURL, kAudioFileCAFType, &audioFormat, NULL, kAudioFileFlags_EraseFile, &mAudioFileRef);
CFRelease(destinationURL);
NSAssert(setupErr == noErr, #"Couldn't create file for writing");
setupErr = ExtAudioFileSetProperty(mAudioFileRef, kExtAudioFileProperty_ClientDataFormat, sizeof(AudioStreamBasicDescription), &audioFormat);
NSAssert(setupErr == noErr, #"Couldn't create file for format");
setupErr = ExtAudioFileWriteAsync(mAudioFileRef, 0, NULL);
NSAssert(setupErr == noErr, #"Couldn't initialize write buffers for audio file");
CheckError(AudioUnitInitialize(mAudioUnit), "AudioUnitInitialize");
CheckError(AudioOutputUnitStart(mAudioUnit), "AudioOutputUnitStart");