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POCan anybody help me in recording iPhone output sound through Audio Unit
 

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  1. POCan anybody help me in recording iPhone output sound through Audio Unit
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    <p>this is my code : i use this code to record the iPhone output audio by using Audio Unit then saving the output in output.caf but the output.caf file is empty any body have idea about what shall i do ? the output audio file is empty </p> <p>this is intializing the audio unit </p> <pre><code>-(void) initializaeOutputUnit { 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, &amp;desc); // Get audio units status = AudioComponentInstanceNew(inputComponent, &amp;audioUnit); // Enable IO for recording UInt32 flag = 1; status = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, kInputBus, &amp;flag, sizeof(flag)); // Enable IO for playback status = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, kOutputBus, &amp;flag, sizeof(flag)); // Describe format AudioStreamBasicDescription audioFormat={0}; 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(audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, kInputBus, &amp;audioFormat, sizeof(audioFormat)); status = AudioUnitSetProperty(audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, kOutputBus, &amp;audioFormat, sizeof(audioFormat)); // Set input callback AURenderCallbackStruct callbackStruct; callbackStruct.inputProc = recordingCallback; callbackStruct.inputProcRefCon = self; status = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Global, kInputBus, &amp;callbackStruct, sizeof(callbackStruct)); // Set output callback callbackStruct.inputProc = playbackCallback; callbackStruct.inputProcRefCon = self; status = AudioUnitSetProperty(audioUnit, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Global, kOutputBus, &amp;callbackStruct, sizeof(callbackStruct)); // Disable buffer allocation for the recorder (optional - do this if we want to pass in our own) flag = 0; status = AudioUnitSetProperty(audioUnit, kAudioUnitProperty_ShouldAllocateBuffer, kAudioUnitScope_Output, kInputBus, &amp;flag, sizeof(flag)); AudioUnitInitialize(audioUnit); AudioOutputUnitStart(audioUnit); // On initialise le fichier audio NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *destinationFilePath = [[[NSString alloc] initWithFormat: @"%@/output.caf", documentsDirectory] autorelease]; NSLog(@"&gt;&gt;&gt; %@", destinationFilePath); CFURLRef destinationURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)destinationFilePath, kCFURLPOSIXPathStyle, false); OSStatus setupErr = ExtAudioFileCreateWithURL(destinationURL, kAudioFileWAVEType, &amp;audioFormat, NULL, kAudioFileFlags_EraseFile, &amp;effectState.audioFileRef); CFRelease(destinationURL); NSAssert(setupErr == noErr, @"Couldn't create file for writing"); setupErr = ExtAudioFileSetProperty(effectState.audioFileRef, kExtAudioFileProperty_ClientDataFormat, sizeof(AudioStreamBasicDescription), &amp;audioFormat); NSAssert(setupErr == noErr, @"Couldn't create file for format"); setupErr = ExtAudioFileWriteAsync(effectState.audioFileRef, 0, NULL); NSAssert(setupErr == noErr, @"Couldn't initialize write buffers for audio file"); } </code></pre> <p>the recording call back </p> <pre><code>static OSStatus recordingCallback (void * inRefCon, AudioUnitRenderActionFlags * ioActionFlags, const AudioTimeStamp * inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * ioData) { NSLog(@"callback"); if (*ioActionFlags == kAudioUnitRenderAction_PostRender&amp;&amp;inBusNumber==0) { AudioBufferList *bufferList; // &lt;- Fill this up with buffers (you will want to malloc it, as it's a dynamic-length list) EffectState *effectState = (EffectState *)inRefCon; AudioUnit rioUnit =[(MixerHostAudio*)inRefCon getAudioUnit]; OSStatus status; NSLog(@"de5eal el call back "); // BELOW I GET THE ERROR status = AudioUnitRender( rioUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, bufferList); if (noErr != status) { NSLog(@"AudioUnitRender error"); return noErr;} // Now, we have the samples we just read sitting in buffers in bufferList ExtAudioFileWriteAsync(effectState-&gt;audioFileRef, inNumberFrames, bufferList); } return noErr; } // then stop Recording - (void) stopRecord { AudioOutputUnitStop(audioUnit); AudioUnitUninitialize(audioUnit); } </code></pre>
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    1. COIt's not sufficient to just say "this is my code" and then post your entire application. That doesn't count as a question.
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      1. POCan anybody help me in recording iPhone output sound through Audio Unit
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    2. COmake it clear and explain the whole scenario.
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    3. COIs there an error coming back from `ExtAudioFileWriteAsync`?
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      1. USmattjgalloway
 

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