iOS RemoteIO - AudioUnitAddRenderNotify обратно извикване

Опитвам се да направя запис от RemoteIO, използвайки AudioUnitAddRenderNotify по този начин. По принцип не мога да получа пробите от bus1, което е моята входна шина. RecordingCallback не преминава след това:

   if (*ioActionFlags & kAudioUnitRenderAction_PostRender || inBusNumber != 1) {
    return noErr;
}

Но ми казаха, че recordingCallback трябва да се извиква за всеки автобус всеки кръг. т.е. извикан с inBusNumber ==0, след това inBusNumber ==1, които са съответно изход (remoteIO out) и вход (шина за запис).

Какво мога да направя, за да накарам recordingCallback да се извика на моята входна шина, за да мога да записвам? Благодаря.

кей.

Ето обратното обаждане.

static OSStatus recordingCallback(void *inRefCon,
                              AudioUnitRenderActionFlags *ioActionFlags,
                              const AudioTimeStamp *inTimeStamp,
                              UInt32 inBusNumber,
                              UInt32 inNumberFrames,
                              AudioBufferList *ioData) {
NSLog(@"Entered recording callback");

// Only do pre render on bus 1
if (*ioActionFlags & kAudioUnitRenderAction_PostRender || inBusNumber != 1) {
    return noErr;
}

RIO *rio = (RIO*)inRefCon;
AudioUnit rioUnit = rio->theAudioUnit;
//ExtAudioFileRef eaf = rio->outEAF;
AudioBufferList abl = rio->audioBufferList;

SInt32 samples[NUMBER_OF_SAMPLES]; // A large enough size to not have to worry about buffer overrun
abl.mNumberBuffers = 1;
abl.mBuffers[0].mData = &samples;
abl.mBuffers[0].mNumberChannels = 1;
abl.mBuffers[0].mDataByteSize = inNumberFrames  * sizeof(SInt16);

OSStatus result;
result = AudioUnitRender(rioUnit,
                         ioActionFlags,
                         inTimeStamp,
                         inBusNumber, 
                         inNumberFrames,
                         &abl);

if (noErr != result) { NSLog(@"Obtain recorded samples error! Error : %ld", result); }

NSLog(@"Bus %ld", inBusNumber); 

// React to a recording flag, if recording, save the abl into own buffer, else ignore
if (rio->recording)
{
    TPCircularBufferProduceBytes(&rio->buffer, abl.mBuffers[0].mData, inNumberFrames  * sizeof(SInt16));
    //rio->timeIncurred += (('p'float)inNumberFrames) / 44100.0;
    //NSLog(@"Self-calculated time incurred: %f", rio->timeIncurred);
}

return noErr;

}

Ето кода, който извиква обратното извикване.

- (void)setupAudioUnitRemoteIO {

UInt32 framesPerSlice = 0;
UInt32 framesPerSlicePropertySize = sizeof (framesPerSlice);
UInt32 sampleRatePropertySize = sizeof (_graphSampleRate);

// 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, &_remoteIOUnit);

if (noErr != status) { NSLog(@"Get audio units error"); return; }

// Enable IO for recording
UInt32 flag = 1;
status = AudioUnitSetProperty(_remoteIOUnit,
                              kAudioOutputUnitProperty_EnableIO, 
                              kAudioUnitScope_Input, 
                              kInputBus,
                              &flag, 
                              sizeof(flag));
if (noErr != status) { NSLog(@"Enable IO for recording error"); return; }

// Enable IO for playback
status = AudioUnitSetProperty(_remoteIOUnit, 
                              kAudioOutputUnitProperty_EnableIO, 
                              kAudioUnitScope_Output, 
                              kOutputBus,
                              &flag, 
                              sizeof(flag));

if (noErr != status) { NSLog(@"Enable IO for playback error"); return; }

// Obtain the value of the maximum-frames-per-slice from the I/O unit.
status =    AudioUnitGetProperty (
                                  _remoteIOUnit,
                                  kAudioUnitProperty_MaximumFramesPerSlice,
                                  kAudioUnitScope_Global,
                                  0,
                                  &framesPerSlice,
                                  &framesPerSlicePropertySize
                                  );

// Describe format

audioFormat.mSampleRate         = 44100.00;
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(_remoteIOUnit, 
                              kAudioUnitProperty_StreamFormat, 
                              kAudioUnitScope_Output, 
                              kInputBus, 
                              &audioFormat, 
                              sizeof(audioFormat));

if (noErr != status) { NSLog(@"Apply format to input bus error"); return; }

status = AudioUnitSetProperty(_remoteIOUnit, 
                              kAudioUnitProperty_StreamFormat, 
                              kAudioUnitScope_Input, 
                              kOutputBus, 
                              &audioFormat, 
                              sizeof(audioFormat));
if (noErr != status) { NSLog(@"Apply format to output bus error"); return; }




rio.theAudioUnit = _remoteIOUnit; // Need this, as used in callbacks to refer to remoteIO

AURenderCallbackStruct callbackStruct;
callbackStruct.inputProc = recordingCallback;
callbackStruct.inputProcRefCon = &rio;
status = AudioUnitAddRenderNotify(_remoteIOUnit, callbackStruct.inputProc,  callbackStruct.inputProcRefCon);

NSAssert (status == noErr, @"Problem adding recordingCallback to RemoteIO. Error code: %d '%.4s'", (int) status, (const char *)&status);