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POiOS Core Audio : Converting between kAudioFormatFlagsCanonical and kAudioFormatFlagsAudioUnitCanonical
 

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  1. POiOS Core Audio : Converting between kAudioFormatFlagsCanonical and kAudioFormatFlagsAudioUnitCanonical
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    <p>I need to convert between this format : </p> <pre><code> format.mSampleRate = 44100.0; format.mFormatID = kAudioFormatLinearPCM; format.mFormatFlags = kAudioFormatFlagsCanonical | kLinearPCMFormatFlagIsNonInterleaved; format.mBytesPerPacket = sizeof(AudioUnitSampleType); format.mFramesPerPacket = 1; format.mBytesPerFrame = sizeof(AudioUnitSampleType); format.mChannelsPerFrame = 2 ; format.mBitsPerChannel = sizeof(AudioUnitSampleType)*8; </code></pre> <p>and this format </p> <pre><code>format.mSampleRate = 44100.0; format.mFormatID = kAudioFormatLinearPCM; format.mFormatFlags = kAudioFormatFlagsAudioUnitCanonical; format.mBytesPerPacket = sizeof(AudioUnitSampleType); format.mFramesPerPacket = 1; format.mBytesPerFrame = sizeof(AudioUnitSampleType); format.mChannelsPerFrame = 2; format.mBitsPerChannel = sizeof(AudioUnitSampleType)*8; </code></pre> <p>within the confines of a audio render callback where there is the following code and buffer[] is in the 2nd format and array[] requires the 1st format. </p> <pre><code>for (k = 0; k &lt; channels; k++){ buffer = (AudioUnitSampleType *) ioData-&gt;mBuffers[k].mData; for(j=0; j &lt; samples; j++){ array[j] = buffer[j]; } } </code></pre> <p>I know you can use the Apple converter unit, but I cannot use the Apple Converter audio unit in my situation (there's a reason). </p> <p>Basically the only difference between the 2 formats the following flag for format.mFormatFlags (kAudioUnitSampleFractionBits &lt;&lt; kLinearPCMFormatFlagsSampleFractionShift). </p> <p>How can I convert buffer[] (containing data in the 2nd format) to array[] (containing data in the 1st format) and vice-versa? </p> <p>Thank you. </p>
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    1. COWhy can't you use the Apple converter?
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    2. COThe audio engine I'm using doesn't support the format that I require for the functions in the audio render (first format). Put simply, there's no way currently to put the converter for the desired format I want in the audio engine I'm trying to use without hacking it. Outside of this audio engine, in my own AUGraph and project, using the converter works.
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