AAC hardware encoder in ExtAudioFile
AAC hardware encoder in ExtAudioFile
- Subject: AAC hardware encoder in ExtAudioFile
- From: Doug McCoy <email@hidden>
- Date: Sat, 4 Dec 2010 21:08:22 -0800
I am using ExtAudioFile services to convert PCM data to AAC. But it only works on the first attempt.
Client format:
AudioStreamBasicDescription: 2 ch, 22050 Hz, 'lpcm' (0x0000000C) 16-bit little-endian signed integer
Destination format:
AudioStreamBasicDescription: 2 ch, 22050 Hz, 'aac ' (0x00000000) 0 bits/channel, 0 bytes/packet, 1024 frames/packet, 0 bytes/frame
Here is a snippet of my code:
XThrowIfError(ExtAudioFileCreateWithURL(fileURL,
kAudioFileM4AType, &dstFormat,
NULL, kAudioFileFlags_EraseFile,
&fileID), "ExtAudioFileCreateWithURL failed!");
size = sizeof(*clientFormat);errorStatus = ExtAudioFileSetProperty(fileID, kExtAudioFileProperty_ClientDataFormat, size, clientFormat);
OSStatus recordError = ExtAudioFileWrite(fileID, ioByteSize / clientFormat->mBytesPerFrame, &bufferList);ExtAudioFileDispose(fileID);
On the first use of this code, everything succeeds so I know the code works. But on subsequent uses i get 'hwiu' returned from ExtAudioFileSetProperty(). I am pretty sure this means that the AAC hardware encoder is in use, but I don't know how to correct this. Is my code not releasing the AAC codec somehow? Is this the resposibility of the developer? I figured the ExtAudioFileDispose() would release all resources.
What am I missing?
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