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POHow can I get AAC encoding with ExtAudioFile on iOS to work?
 

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  1. POHow can I get AAC encoding with ExtAudioFile on iOS to work?
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    <p>I need to convert a WAVE file into an AAC encoded M4A file on iOS. I'm aware that AAC encoding is not supported on older devices or in the simulator. I'm testing that before I run the code. But I still can't get it to work.</p> <p>I looked into Apple's very own <a href="https://developer.apple.com/library/ios/#samplecode/iPhoneExtAudioFileConvertTest/Introduction/Intro.html" rel="noreferrer">iPhoneExtAudioFileConvertTest</a> example and I thought I followed it exactly, but still no luck!</p> <p>Currently, I get a -50 (= error in user parameter list) while trying to set the client format on the destination file. On the source file, it works.</p> <p>Below is my code. Any help is very much appreciated, thanks!</p> <pre><code>UInt32 size; // Open a source audio file. ExtAudioFileRef sourceAudioFile; ExtAudioFileOpenURL( (CFURLRef)sourceURL, &amp;sourceAudioFile ); // Get the source data format AudioStreamBasicDescription sourceFormat; size = sizeof( sourceFormat ); result = ExtAudioFileGetProperty( sourceAudioFile, kExtAudioFileProperty_FileDataFormat, &amp;size, &amp;sourceFormat ); // Define the output format (AAC). AudioStreamBasicDescription outputFormat; outputFormat.mFormatID = kAudioFormatMPEG4AAC; outputFormat.mSampleRate = 44100; outputFormat.mChannelsPerFrame = 2; // Use AudioFormat API to fill out the rest of the description. size = sizeof( outputFormat ); AudioFormatGetProperty( kAudioFormatProperty_FormatInfo, 0, NULL, &amp;size, &amp;outputFormat); // Make a destination audio file with this output format. ExtAudioFileRef destAudioFile; ExtAudioFileCreateWithURL( (CFURLRef)destURL, kAudioFileM4AType, &amp;outputFormat, NULL, kAudioFileFlags_EraseFile, &amp;destAudioFile ); // Create canonical PCM client format. AudioStreamBasicDescription clientFormat; clientFormat.mSampleRate = sourceFormat.mSampleRate; clientFormat.mFormatID = kAudioFormatLinearPCM; clientFormat.mFormatFlags = kAudioFormatFlagIsPacked | kAudioFormatFlagIsSignedInteger; clientFormat.mChannelsPerFrame = 2; clientFormat.mBitsPerChannel = 16; clientFormat.mBytesPerFrame = 4; clientFormat.mBytesPerPacket = 4; clientFormat.mFramesPerPacket = 1; // Set the client format in source and destination file. size = sizeof( clientFormat ); ExtAudioFileSetProperty( sourceAudioFile, kExtAudioFileProperty_ClientDataFormat, size, &amp;clientFormat ); size = sizeof( clientFormat ); ExtAudioFileSetProperty( destAudioFile, kExtAudioFileProperty_ClientDataFormat, size, &amp;clientFormat ); // Make a buffer int bufferSizeInFrames = 8000; int bufferSize = ( bufferSizeInFrames * sourceFormat.mBytesPerFrame ); UInt8 * buffer = (UInt8 *)malloc( bufferSize ); AudioBufferList bufferList; bufferList.mNumberBuffers = 1; bufferList.mBuffers[0].mNumberChannels = clientFormat.mChannelsPerFrame; bufferList.mBuffers[0].mData = buffer; bufferList.mBuffers[0].mDataByteSize = ( bufferSize ); while( TRUE ) { // Try to fill the buffer to capacity. UInt32 framesRead = bufferSizeInFrames; ExtAudioFileRead( sourceAudioFile, &amp;framesRead, &amp;bufferList ); // 0 frames read means EOF. if( framesRead == 0 ) break; // Write. ExtAudioFileWrite( destAudioFile, framesRead, &amp;bufferList ); } free( buffer ); // Close the files. ExtAudioFileDispose( sourceAudioFile ); ExtAudioFileDispose( destAudioFile ); </code></pre>
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    1. COEver get this working? I am looking to convert a .wav to .acc as well.
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      1. POHow can I get AAC encoding with ExtAudioFile on iOS to work?
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    2. COHey Ryan, check out my own answer to this below.
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