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POrecord sounds played by my iPhone app with audio units
 

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  1. POrecord sounds played by my iPhone app with audio units
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    <p>I have red a lot of interesting stuff today about <strong>iOS &amp; Audio Units</strong> and have found a lot of usefull resources (SO included).</p> <p><strong>First of all</strong>, i am confused with something : Is it really necessary to create an <em>audio graph</em> with <em>mixer unit</em> to record sounds played by an app ? </p> <p>Or is it sufficient to play sounds with <a href="https://github.com/kstenerud/ObjectAL-for-iPhone" rel="nofollow" title="ObjectAL, luv it !">ObjectAL</a> (or more simply AVAudioPlayer calls) and create a single <em>remote io unit</em> adressed on the correct bus with a recording callback ?</p> <p><strong>Second</strong>, a more programmatically issue ! As i'm not already comfortable with <em>Audio Units</em> concepts, i try to adapt the <a href="http://developer.apple.com/library/ios/#samplecode/MixerHost/Introduction/Intro.html" rel="nofollow">apple Mixer Host project</a> with the ability to record the resulting mix. Obviously, i try to do this with the <a href="http://atastypixel.com/blog/using-remoteio-audio-unit/" rel="nofollow">Michael Tyson RemoteIO post</a>.</p> <p>And I get a EXC_BAD_ACCESS on my callback function :</p> <pre><code>static OSStatus recordingCallback (void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList *ioData) { 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 = effectState-&gt;rioUnit; OSStatus status; // 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; } </code></pre> <p>Before using the callback function i did in <strong>MixerHostAudio.h</strong></p> <pre><code>typedef struct { AudioUnit rioUnit; ExtAudioFileRef audioFileRef; } EffectState; </code></pre> <p>And create in the interface :</p> <pre><code>AudioUnit iOUnit; EffectState effectState; AudioStreamBasicDescription iOStreamFormat; ... @property AudioUnit iOUnit; @property (readwrite) AudioStreamBasicDescription iOStreamFormat; </code></pre> <p>Then in the implementation file <strong>MixerHostAudio.h</strong> :</p> <pre><code>#define kOutputBus 0 #define kInputBus 1 ... @synthesize iOUnit; // the Remote IO unit ... result = AUGraphNodeInfo ( processingGraph, iONode, NULL, &amp;iOUnit ); if (noErr != result) {[self printErrorMessage: @"AUGraphNodeInfo" withStatus: result]; return;} // Enable IO for recording UInt32 flag = 1; result = AudioUnitSetProperty(iOUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, kInputBus, &amp;flag, sizeof(flag)); if (noErr != result) {[self printErrorMessage: @"AudioUnitSetProperty" withStatus: result]; return;} // Describe format iOStreamFormat.mSampleRate = 44100.00; iOStreamFormat.mFormatID = kAudioFormatLinearPCM; iOStreamFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked; iOStreamFormat.mFramesPerPacket = 1; iOStreamFormat.mChannelsPerFrame = 1; iOStreamFormat.mBitsPerChannel = 16; iOStreamFormat.mBytesPerPacket = 2; iOStreamFormat.mBytesPerFrame = 2; // Apply format result = AudioUnitSetProperty(iOUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, kInputBus, &amp;iOStreamFormat, sizeof(iOStreamFormat)); if (noErr != result) {[self printErrorMessage: @"AudioUnitSetProperty" withStatus: result]; return;} result = AudioUnitSetProperty(iOUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, kOutputBus, &amp;iOStreamFormat, sizeof(iOStreamFormat)); if (noErr != result) {[self printErrorMessage: @"AudioUnitSetProperty" withStatus: result]; return;} effectState.rioUnit = iOUnit; // Set input callback ----&gt; RECORDING AURenderCallbackStruct callbackStruct; callbackStruct.inputProc = recordingCallback; callbackStruct.inputProcRefCon = self; result = AudioUnitSetProperty(iOUnit, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Global, kInputBus, &amp;callbackStruct, sizeof(callbackStruct)); if (noErr != result) {[self printErrorMessage: @"AudioUnitSetProperty" withStatus: result]; return;} </code></pre> <p>But I don't know what's wrong and don't know how to digg. Note : The <em>EffectState</em> struct is present because I also try to integrate the <a href="https://github.com/brennon/BioAudio" rel="nofollow">BioAudio project</a> ability to write file from buffers.</p> <p><strong>And Third</strong>, I wonder if there something easier to do to record sounds played by my iPhone app (ie microphone excluded) ?</p>
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    1. COdoes it work for you ???? record audio file,,,,
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    2. COyes, take a look at https://github.com/michaeltyson/TPAACAudioConverter
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    3. COsorry thats Not Exactly what i want , i want to Mix two audio files and save it in another audio file do u have any idea about it???
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