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livetrax/libs/appleutility/CoreAudio/PublicUtility/CAAudioUnitOutputCapturer.h

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/*
File: CAAudioUnitOutputCapturer.h
Abstract: Part of CoreAudio Utility Classes
Version: 1.1
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*/
#ifndef __CAAudioUnitOutputCapturer_h__
#define __CAAudioUnitOutputCapturer_h__
#include <AudioToolbox/ExtendedAudioFile.h>
/*
Class to capture output from an AudioUnit for analysis.
example:
CFURL fileurl = CFURLCreateWithFileSystemPath(NULL, CFSTR("/tmp/recording.caf"), kCFURLPOSIXPathStyle, false);
CAAudioUnitOutputCapturer captor(someAU, fileurl, 'caff', anASBD);
{
captor.Start();
...
captor.Stop();
} // can repeat
captor.Close(); // can be omitted; happens automatically from destructor
*/
class CAAudioUnitOutputCapturer {
public:
enum { noErr = 0 };
CAAudioUnitOutputCapturer(AudioUnit au, CFURLRef outputFileURL, AudioFileTypeID fileType, const AudioStreamBasicDescription &format, UInt32 busNumber = 0) :
mFileOpen(false),
mClientFormatSet(false),
mAudioUnit(au),
mExtAudioFile(NULL),
mBusNumber (busNumber)
{
CFShow(outputFileURL);
OSStatus err = ExtAudioFileCreateWithURL(outputFileURL, fileType, &format, NULL, kAudioFileFlags_EraseFile, &mExtAudioFile);
if (!err)
mFileOpen = true;
}
void Start() {
if (mFileOpen) {
if (!mClientFormatSet) {
AudioStreamBasicDescription clientFormat;
UInt32 size = sizeof(clientFormat);
AudioUnitGetProperty(mAudioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, mBusNumber, &clientFormat, &size);
ExtAudioFileSetProperty(mExtAudioFile, kExtAudioFileProperty_ClientDataFormat, size, &clientFormat);
mClientFormatSet = true;
}
ExtAudioFileWriteAsync(mExtAudioFile, 0, NULL); // initialize async writes
AudioUnitAddRenderNotify(mAudioUnit, RenderCallback, this);
}
}
void Stop() {
if (mFileOpen)
AudioUnitRemoveRenderNotify(mAudioUnit, RenderCallback, this);
}
void Close() {
if (mExtAudioFile) {
ExtAudioFileDispose(mExtAudioFile);
mExtAudioFile = NULL;
}
}
~CAAudioUnitOutputCapturer() {
Close();
}
private:
static OSStatus RenderCallback( void * inRefCon,
AudioUnitRenderActionFlags * ioActionFlags,
const AudioTimeStamp * inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList * ioData)
{
if (*ioActionFlags & kAudioUnitRenderAction_PostRender) {
CAAudioUnitOutputCapturer *This = (CAAudioUnitOutputCapturer *)inRefCon;
static int TEMP_kAudioUnitRenderAction_PostRenderError = (1 << 8);
if (This->mBusNumber == inBusNumber && !(*ioActionFlags & TEMP_kAudioUnitRenderAction_PostRenderError)) {
OSStatus result = ExtAudioFileWriteAsync(This->mExtAudioFile, inNumberFrames, ioData);
if (result) DebugMessageN1("ERROR WRITING FRAMES: %d\n", (int)result);
}
}
return noErr;
}
bool mFileOpen;
bool mClientFormatSet;
AudioUnit mAudioUnit;
ExtAudioFileRef mExtAudioFile;
UInt32 mBusNumber;
};
#endif // __CAAudioUnitOutputCapturer_h__