OSStatus Preroll (CAAudioUnit & inAU, UInt32 inFrameSize)
{
CAStreamBasicDescription desc;
OSStatus result = inAU.GetFormat (kAudioUnitScope_Input, 0, desc);
bool hasInput = false;
//we have input
if (result == noErr)
{
sRenderCallback.inputProc = PrerollRenderProc;
sRenderCallback.inputProcRefCon = 0;
result = inAU.SetProperty (kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input,
0, &sRenderCallback, sizeof(sRenderCallback));
if (result) return result;
hasInput = true;
}
AudioUnitRenderActionFlags flags = 0;
AudioTimeStamp time;
memset (&time, 0, sizeof(time));
time.mFlags = kAudioTimeStampSampleTimeValid;
CAStreamBasicDescription outputFormat;
ca_require_noerr (result = inAU.GetFormat (kAudioUnitScope_Output, 0, outputFormat), home);
{
AUOutputBL list (outputFormat, inFrameSize);
list.Prepare ();
result = inAU.Render (&flags, &time, 0, inFrameSize, list.ABL());
if (result) { printf("A result %d\n", (int)result); goto home; }
}
home:
if (hasInput) {
// remove our installed callback
sRenderCallback.inputProc = 0;
sRenderCallback.inputProcRefCon = 0;
inAU.SetProperty (kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input,
0, &sRenderCallback, sizeof(sRenderCallback));
}
return result;
}
void WriteOutputFile (const char* outputFilePath,
OSType dataFormat,
Float64 srate,
MusicTimeStamp sequenceLength,
bool shouldPrint,
AUGraph inGraph,
UInt32 numFrames,
MusicPlayer player)
{
OSStatus result = 0;
UInt32 size;
CAStreamBasicDescription outputFormat;
outputFormat.mChannelsPerFrame = 2;
outputFormat.mSampleRate = srate;
outputFormat.mFormatID = dataFormat;
AudioFileTypeID destFileType;
CAAudioFileFormats::Instance()->InferFileFormatFromFilename (outputFilePath, destFileType);
if (dataFormat == kAudioFormatLinearPCM) {
outputFormat.mBytesPerPacket = outputFormat.mChannelsPerFrame * 2;
outputFormat.mFramesPerPacket = 1;
outputFormat.mBytesPerFrame = outputFormat.mBytesPerPacket;
outputFormat.mBitsPerChannel = 16;
if (destFileType == kAudioFileWAVEType)
outputFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger
| kLinearPCMFormatFlagIsPacked;
else
outputFormat.mFormatFlags = kLinearPCMFormatFlagIsBigEndian
| kLinearPCMFormatFlagIsSignedInteger
| kLinearPCMFormatFlagIsPacked;
} else {
// use AudioFormat API to fill out the rest.
size = sizeof(outputFormat);
FailIf ((result = AudioFormatGetProperty(kAudioFormatProperty_FormatInfo, 0, NULL, &size, &outputFormat)), fail, "");
}
if (shouldPrint) {
printf ("Writing to file: %s with format:\n* ", outputFilePath);
outputFormat.Print();
}
CFURLRef url; url = CFURLCreateFromFileSystemRepresentation(NULL, (const UInt8*)outputFilePath, strlen(outputFilePath), false);
// create output file, delete existing file
ExtAudioFileRef outfile;
result = ExtAudioFileCreateWithURL(url, destFileType, &outputFormat, NULL, kAudioFileFlags_EraseFile, &outfile);
if (url) CFRelease (url);
FailIf (result, fail, "ExtAudioFileCreateWithURL");
AudioUnit outputUnit; outputUnit = NULL;
UInt32 nodeCount;
FailIf ((result = AUGraphGetNodeCount (inGraph, &nodeCount)), fail, "AUGraphGetNodeCount");
for (UInt32 i = 0; i < nodeCount; ++i)
{
AUNode node;
FailIf ((result = AUGraphGetIndNode(inGraph, i, &node)), fail, "AUGraphGetIndNode");
AudioComponentDescription desc;
FailIf ((result = AUGraphNodeInfo(inGraph, node, &desc, NULL)), fail, "AUGraphNodeInfo");
if (desc.componentType == kAudioUnitType_Output)
{
FailIf ((result = AUGraphNodeInfo(inGraph, node, 0, &outputUnit)), fail, "AUGraphNodeInfo");
break;
}
}
FailIf ((result = (outputUnit == NULL)), fail, "outputUnit == NULL");
{
CAStreamBasicDescription clientFormat = CAStreamBasicDescription();
size = sizeof(clientFormat);
FailIf ((result = AudioUnitGetProperty (outputUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, 0,
&clientFormat, &size)), fail, "AudioUnitGetProperty: kAudioUnitProperty_StreamFormat");
size = sizeof(clientFormat);
FailIf ((result = ExtAudioFileSetProperty(outfile, kExtAudioFileProperty_ClientDataFormat, size, &clientFormat)), fail, "ExtAudioFileSetProperty: kExtAudioFileProperty_ClientDataFormat");
{
MusicTimeStamp currentTime;
AUOutputBL outputBuffer (clientFormat, numFrames);
AudioTimeStamp tStamp;
memset (&tStamp, 0, sizeof(AudioTimeStamp));
tStamp.mFlags = kAudioTimeStampSampleTimeValid;
int i = 0;
int numTimesFor10Secs = (int)(10. / (numFrames / srate));
do {
outputBuffer.Prepare();
AudioUnitRenderActionFlags actionFlags = 0;
FailIf ((result = AudioUnitRender (outputUnit, &actionFlags, &tStamp, 0, numFrames, outputBuffer.ABL())), fail, "AudioUnitRender");
tStamp.mSampleTime += numFrames;
FailIf ((result = ExtAudioFileWrite(outfile, numFrames, outputBuffer.ABL())), fail, "ExtAudioFileWrite");
FailIf ((result = MusicPlayerGetTime (player, ¤tTime)), fail, "MusicPlayerGetTime");
if (shouldPrint && (++i % numTimesFor10Secs == 0))
printf ("current time: %6.2f beats\n", currentTime);
} while (currentTime < sequenceLength);
}
}
// close
ExtAudioFileDispose(outfile);
return;
fail:
printf ("Problem: %ld\n", (long)result);
exit(1);
}
void WriteOutputFile (const char* outputFilePath,
OSType dataFormat,
Float64 srate,
MusicTimeStamp sequenceLength,
bool shouldPrint,
AUGraph inGraph,
UInt32 numFrames,
MusicPlayer player)
{
// delete existing output file
TestFile (outputFilePath, true);
OSStatus result = 0;
UInt32 size;
CAStreamBasicDescription outputFormat;
outputFormat.mChannelsPerFrame = 2;
outputFormat.mSampleRate = srate;
outputFormat.mFormatID = dataFormat;
AudioFileTypeID destFileType;
CAAudioFileFormats::Instance()->InferFileFormatFromFilename (outputFilePath, destFileType);
if (dataFormat == kAudioFormatLinearPCM) {
outputFormat.mBytesPerPacket = outputFormat.mChannelsPerFrame * 2;
outputFormat.mFramesPerPacket = 1;
outputFormat.mBytesPerFrame = outputFormat.mBytesPerPacket;
outputFormat.mBitsPerChannel = 16;
if (destFileType == kAudioFileWAVEType)
outputFormat.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger
| kLinearPCMFormatFlagIsPacked;
else
outputFormat.mFormatFlags = kLinearPCMFormatFlagIsBigEndian
| kLinearPCMFormatFlagIsSignedInteger
| kLinearPCMFormatFlagIsPacked;
} else {
// use AudioFormat API to fill out the rest.
size = sizeof(outputFormat);
require_noerr (result = AudioFormatGetProperty(kAudioFormatProperty_FormatInfo, 0, NULL, &size, &outputFormat), fail);
}
if (shouldPrint) {
printf ("Writing to file: %s with format:\n* ", outputFilePath);
outputFormat.Print();
}
FSRef parentDir;
CFStringRef destFileName;
require_noerr (result = PosixPathToParentFSRefAndName(outputFilePath, parentDir, destFileName), fail);
ExtAudioFileRef outfile;
result = ExtAudioFileCreateNew (&parentDir, destFileName, destFileType, &outputFormat, NULL, &outfile);
CFRelease (destFileName);
require_noerr (result, fail);
AudioUnit outputUnit;
UInt32 nodeCount;
require_noerr (result = AUGraphGetNodeCount (inGraph, &nodeCount), fail);
for (UInt32 i = 0; i < nodeCount; ++i)
{
AUNode node;
require_noerr (result = AUGraphGetIndNode(inGraph, i, &node), fail);
ComponentDescription desc;
require_noerr (result = AUGraphNodeInfo(inGraph, node, &desc, NULL), fail);
if (desc.componentType == kAudioUnitType_Output)
{
require_noerr (result = AUGraphNodeInfo(inGraph, node, 0, &outputUnit), fail);
break;
}
}
{
CAStreamBasicDescription clientFormat;
size = sizeof(clientFormat);
require_noerr (result = AudioUnitGetProperty (outputUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, 0,
&clientFormat, &size), fail);
size = sizeof(clientFormat);
require_noerr (result = ExtAudioFileSetProperty(outfile, kExtAudioFileProperty_ClientDataFormat, size, &clientFormat), fail);
{
MusicTimeStamp currentTime;
AUOutputBL outputBuffer (clientFormat, numFrames);
AudioTimeStamp tStamp;
memset (&tStamp, 0, sizeof(AudioTimeStamp));
tStamp.mFlags = kAudioTimeStampSampleTimeValid;
int i = 0;
int numTimesFor10Secs = (int)(10. / (numFrames / srate));
do {
outputBuffer.Prepare();
AudioUnitRenderActionFlags actionFlags = 0;
require_noerr (result = AudioUnitRender (outputUnit, &actionFlags, &tStamp, 0, numFrames, outputBuffer.ABL()), fail);
tStamp.mSampleTime += numFrames;
require_noerr (result = ExtAudioFileWrite(outfile, numFrames, outputBuffer.ABL()), fail);
require_noerr (result = MusicPlayerGetTime (player, ¤tTime), fail);
if (shouldPrint && (++i % numTimesFor10Secs == 0))
printf ("current time: %6.2f beats\n", currentTime);
} while (currentTime < sequenceLength);
}
}
// close
ExtAudioFileDispose(outfile);
return;
fail:
printf ("Problem: %ld\n", result);
exit(1);
}