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2012-02-04T00:16:07.843
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In initializaeOutputUnit you only created your audio file: <pre><code>OSStatus setupErr = ExtAudioFileCreateWithURL(destinationURL, kAudioFileWAVEType, &audioFormat, NULL, kAudioFileFlags_EraseFile, &effectState.audioFileRef); </code></pre> by passing 0 (frames) and NULL (audiobuffer) is just for init internal buffers: <pre><code>setupErr = ExtAudioFileWriteAsync(effectState.audioFileRef, 0, NULL); </code></pre> That's what's going wrong in recordingCallback: 1) ioActionFlags are always 0 and inBusNumber are always 1, because thats how you setup your callback (kInputBus = 1): <pre><code>if (*ioActionFlags == kAudioUnitRenderAction_PostRender&&inBusNumber==0) </code></pre> so just remove the if statement. 2) From AudioUnitRender you will receive -50 error, which is defined in CoreAudioTypes.h as an kAudio_ParamError error. This happens by bufferList is not defined and NULL! <blockquote> <pre><code> OSStatus status; status = AudioUnitRender(THIS->mAudioUnit, ioActionFlags, inTimeStamp, kInputBus, inNumberFrames, &bufferList); if (noErr != status) { printf("AudioUnitRender error: %ld", status); return noErr; } </code></pre> </blockquote> You just need to define an valid AudioBuffer and pass it to AudioUnitRender, this is my working RenderCallback: <blockquote> <pre><code> static OSStatus recordingCallback (void * inRefCon, AudioUnitRenderActionFlags * ioActionFlags, const AudioTimeStamp * inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * ioData) { double timeInSeconds = inTimeStamp->mSampleTime / kSampleRate; printf("\n%fs inBusNumber: %lu inNumberFrames: %lu ", timeInSeconds, inBusNumber, inNumberFrames); //printAudioUnitRenderActionFlags(ioActionFlags); AudioBufferList bufferList; SInt16 samples[inNumberFrames]; // A large enough size to not have to worry about buffer overrun memset (&samples, 0, sizeof (samples)); bufferList.mNumberBuffers = 1; bufferList.mBuffers[0].mData = samples; bufferList.mBuffers[0].mNumberChannels = 1; bufferList.mBuffers[0].mDataByteSize = inNumberFrames*sizeof(SInt16); ViewController* THIS = THIS = (__bridge ViewController *)inRefCon; OSStatus status; status = AudioUnitRender(THIS->mAudioUnit, ioActionFlags, inTimeStamp, kInputBus, inNumberFrames, &bufferList); if (noErr != status) { printf("AudioUnitRender error: %ld", status); return noErr; } // Now, we have the samples we just read sitting in buffers in bufferList ExtAudioFileWriteAsync(THIS->mAudioFileRef, inNumberFrames, &bufferList); return noErr; } </code></pre> </blockquote> In stopRecord you should close the audio file with ExtAudioFileDispose: <blockquote> <pre><code> - (void)stopRecording:(NSTimer*)theTimer { printf("\nstopRecording\n"); AudioOutputUnitStop(mAudioUnit); AudioUnitUninitialize(mAudioUnit); OSStatus status = ExtAudioFileDispose(mAudioFileRef); printf("OSStatus(ExtAudioFileDispose): %ld\n", status); } </code></pre> </blockquote> Full source code: <a href="http://pastebin.com/92Fyjaye">http://pastebin.com/92Fyjaye</a>
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