Re: Capturing AU output to file
Re: Capturing AU output to file
- Subject: Re: Capturing AU output to file
- From: Doug Wyatt <email@hidden>
- Date: Fri, 10 Apr 2009 14:57:37 -0700
e.g. to make a 16-bit stereo AIFF:
AudioStreamBasicDescription filefmt;
filefmt.mSampleRate = auRenderSampleRate;
// you probably don't want to guess on the sample rate; get the AU's
rate
filefmt.mFormatID = kAudioFormatLinearPCM;
filefmt.mFormatFlags = kAudioFormatFlagIsSignedInteger |
kAudioFormatFlagIsPacked;
filefmt.mBytesPerPacket = filefmt.mBytesPerFrame = 4;
filefmt.mFramesPerPacket = 1;
filefmt.mChannelsPerFrame = 2;
filefmt.mBitsPerChannel = 16;
On Apr 10, 2009, at 14:40 , Doug Wyatt wrote:
On Apr 10, 2009, at 14:34 , Jeff Evans wrote:
Thanks, Doug - though as you say, AudioUnitGetProperty is used to
fill in the ASBD based on the characteristics of the synth, which
is the DLS synth. Then that ASBD is applied to the external file
using ExtAudioFileSetProperty. The sample code doesn't include any
other way of setting the output format, aside from specifying the
type (WAVE, AIFF, CAF, etc.). I don't see why this sample code
would work, given what you say below. Actually I have no proof
that the sample code does work, I suppose.
In any event I've tried specifying CAF file output too, but
ExtAudioFileCreateNew still fails with the unsupported format error
with the ASBD filled out as per the sample code. Is the sample code
missing some way to set up a separate ASBD for the output file?
Sorry, I have no idea of what sample code you are looking at or
where to find it. I do, however, have a copy of
CAAudioUnitOutputCapturer.h in front of me. What is the audio data
format being passed to the constructor? If you get an error even
when specifying CAF, then most likely the data format is not
correctly filled out.
Doug
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