Re: ExtAudioFileSetProperty
Re: ExtAudioFileSetProperty
- Subject: Re: ExtAudioFileSetProperty
- From: Doug Wyatt <email@hidden>
- Date: Wed, 18 Jun 2008 07:56:42 -0700
The source data format specifies 24 bits in the low-order bits of 32-
bit words. AudioConverter doesn't support that... ExtAudioFile uses
AudioConverter.
D
On Jun 15, 2008, at 13:41, Jeff LaMarche <email@hidden> wrote:
Greetings all...
I'm having problems writing data to a file. I've got a buffer of
data that came from a device that's got the following
characteristics (inASBD)
mBitsPerChannel 24
mBytesPerFrame 8
mBytesPerPacket 8
mChannelsPerFrame 2
mFormatFlags 4 // (kAudioFormatFlagIsSignedInteger)
mFormatID 1819304813 // kAudioFormatLinearPCM
mFramesPerPacket 1
mSampleRate 48000
I'm trying to write this to an AIIF file, so I create a new ASBD,
which has the following values (outASBD):
mBitsPerChannel 24
mBytesPerFrame 6
mBytesPerPacket 6
mChannelsPerFrame 2
mFormatFlags 14 // (kLinearPCMFormatFlagIsSignedInteger
| kLinearPCMFormatFlagIsPacked | kAudioFormatFlagIsBigEndian)
mFormatID 1819304813 // kAudioFormatLinearPCM
mFramesPerPacket 1
mSampleRate 48000
I'm able to open the output file for writing using
ExtAudioFileCreateNew with the outASBD, but when I call
ExtAudioFileSetProperty to set the ExtAudioFilePropertyID property
to inASBD so it knows how to do the conversion, I get a 'fmt?'
error. I can get it to work if I change the mBytesPerFrame and
mBytesPerPacket of inASBD 6, but that creates a file full of static,
because I'm lying to system about the number of bytes per frame in
the input data.
Does anyone have any idea what's going on? I'm been pulling my hair
out over this for quite some time.
Thanks,
Jeff
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