inline OSStatus SetInputCallback (CAAudioUnit &inUnit, AURenderCallbackStruct &inInputCallback)
{
return inUnit.SetProperty (kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Input,
0,
&inInputCallback,
sizeof(inInputCallback));
}
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;
}
CAAUChanHelper::CAAUChanHelper(const CAAudioUnit &inAU, AudioUnitScope inScope)
:mChans(NULL), mNumEls(0), mDidAllocate(false)
{
UInt32 elCount;
if (inAU.GetElementCount (inScope, elCount)) return;
if (elCount > 8) {
mChans = new UInt32[elCount];
mDidAllocate = true;
memset (mChans, 0, sizeof(int) * elCount);
} else {
mChans = mStaticChans;
memset (mChans, 0, sizeof(int) * 8);
}
for (unsigned int i = 0; i < elCount; ++i) {
UInt32 numChans;
if (inAU.NumberChannels (inScope, i, numChans)) return;
mChans[i] = numChans;
}
mNumEls = elCount;
}
double PrepareFileAU (CAAudioUnit &au, CAStreamBasicDescription &fileFormat, AudioFileID audioFile)
{
//
// calculate the duration
UInt64 nPackets;
UInt32 propsize = sizeof(nPackets);
XThrowIfError (AudioFileGetProperty(audioFile, kAudioFilePropertyAudioDataPacketCount, &propsize, &nPackets), "kAudioFilePropertyAudioDataPacketCount");
Float64 fileDuration = (nPackets * fileFormat.mFramesPerPacket) / fileFormat.mSampleRate;
ScheduledAudioFileRegion rgn;
memset (&rgn.mTimeStamp, 0, sizeof(rgn.mTimeStamp));
rgn.mTimeStamp.mFlags = kAudioTimeStampSampleTimeValid;
rgn.mTimeStamp.mSampleTime = 0;
rgn.mCompletionProc = NULL;
rgn.mCompletionProcUserData = NULL;
rgn.mAudioFile = audioFile;
rgn.mLoopCount = 1;
rgn.mStartFrame = 0;
rgn.mFramesToPlay = UInt32(nPackets * fileFormat.mFramesPerPacket);
// tell the file player AU to play all of the file
XThrowIfError (au.SetProperty (kAudioUnitProperty_ScheduledFileRegion,
kAudioUnitScope_Global, 0,&rgn, sizeof(rgn)), "kAudioUnitProperty_ScheduledFileRegion");
// prime the fp AU with default values
UInt32 defaultVal = 0;
XThrowIfError (au.SetProperty (kAudioUnitProperty_ScheduledFilePrime,
kAudioUnitScope_Global, 0, &defaultVal, sizeof(defaultVal)), "kAudioUnitProperty_ScheduledFilePrime");
// tell the fp AU when to start playing (this ts is in the AU's render time stamps; -1 means next render cycle)
AudioTimeStamp startTime;
memset (&startTime, 0, sizeof(startTime));
startTime.mFlags = kAudioTimeStampSampleTimeValid;
startTime.mSampleTime = -1;
XThrowIfError (au.SetProperty(kAudioUnitProperty_ScheduleStartTimeStamp,
kAudioUnitScope_Global, 0, &startTime, sizeof(startTime)), "kAudioUnitProperty_ScheduleStartTimeStamp");
return fileDuration;
}
void CAAUMIDIMap::SaveAsMapPList (AudioUnit inUnit, const AUParameterMIDIMapping* inMappings, UInt32 inNumMappings, CFPropertyListRef &outData, CFStringRef inName)
{
CACFDictionary mappingDict (false);
CACFArray maps (true);
for (UInt32 i = 0; i< inNumMappings; ++i)
{
CFPropertyListRef data;
CAAUMIDIMap paramMap(inMappings[i]);
paramMap.Save (data);
if (data)
{
maps.AppendCFType (data);
CFRelease(data);
}
}
if (maps.GetNumberItems()) {
mappingDict.AddCFType (kParamMIDIStr, maps.GetCFArray());
// Add the AU info here - where this map came from
CAAudioUnit au (inUnit);
CFPropertyListRef data;
au.Comp().Save (&data);
mappingDict.AddCFType (kAUStr, data);
CFRelease(data);
if (!inName) inName = CFSTR("Untitled");
mappingDict.AddString (CFSTR("name"), inName);
mappingDict.AddUInt32 (CFSTR("version"), 1);
outData = mappingDict.AsPropertyList();
} else {
mappingDict.ShouldRelease(true);
outData = NULL;
}
}
void MakeSimpleGraph (AUGraph &theGraph, CAAudioUnit &fileAU, CAStreamBasicDescription &fileFormat, AudioFileID audioFile)
{
XThrowIfError (NewAUGraph (&theGraph), "NewAUGraph");
CAComponentDescription cd;
// output node
cd.componentType = kAudioUnitType_Output;
cd.componentSubType = kAudioUnitSubType_DefaultOutput;
cd.componentManufacturer = kAudioUnitManufacturer_Apple;
AUNode outputNode;
XThrowIfError (AUGraphAddNode (theGraph, &cd, &outputNode), "AUGraphAddNode");
// file AU node
AUNode fileNode;
cd.componentType = kAudioUnitType_Generator;
cd.componentSubType = kAudioUnitSubType_AudioFilePlayer;
XThrowIfError (AUGraphAddNode (theGraph, &cd, &fileNode), "AUGraphAddNode");
// connect & setup
XThrowIfError (AUGraphOpen (theGraph), "AUGraphOpen");
// install overload listener to detect when something is wrong
AudioUnit anAU;
XThrowIfError (AUGraphNodeInfo(theGraph, fileNode, NULL, &anAU), "AUGraphNodeInfo");
fileAU = CAAudioUnit (fileNode, anAU);
// prepare the file AU for playback
// set its output channels
XThrowIfError (fileAU.SetNumberChannels (kAudioUnitScope_Output, 0, fileFormat.NumberChannels()), "SetNumberChannels");
// set the output sample rate of the file AU to be the same as the file:
XThrowIfError (fileAU.SetSampleRate (kAudioUnitScope_Output, 0, fileFormat.mSampleRate), "SetSampleRate");
// load in the file
XThrowIfError (fileAU.SetProperty(kAudioUnitProperty_ScheduledFileIDs,
kAudioUnitScope_Global, 0, &audioFile, sizeof(audioFile)), "SetScheduleFile");
XThrowIfError (AUGraphConnectNodeInput (theGraph, fileNode, 0, outputNode, 0), "AUGraphConnectNodeInput");
// AT this point we make sure we have the file player AU initialized
// this also propogates the output format of the AU to the output unit
XThrowIfError (AUGraphInitialize (theGraph), "AUGraphInitialize");
// workaround a race condition in the file player AU
usleep (10 * 1000);
// if we have a surround file, then we should try to tell the output AU what the order of the channels will be
if (fileFormat.NumberChannels() > 2) {
UInt32 layoutSize = 0;
OSStatus err;
XThrowIfError (err = AudioFileGetPropertyInfo (audioFile, kAudioFilePropertyChannelLayout, &layoutSize, NULL),
"kAudioFilePropertyChannelLayout");
if (!err && layoutSize) {
char* layout = new char[layoutSize];
err = AudioFileGetProperty(audioFile, kAudioFilePropertyChannelLayout, &layoutSize, layout);
XThrowIfError (err, "Get Layout From AudioFile");
// ok, now get the output AU and set its layout
XThrowIfError (AUGraphNodeInfo(theGraph, outputNode, NULL, &anAU), "AUGraphNodeInfo");
err = AudioUnitSetProperty (anAU, kAudioUnitProperty_AudioChannelLayout,
kAudioUnitScope_Input, 0, layout, layoutSize);
XThrowIfError (err, "kAudioUnitProperty_AudioChannelLayout");
delete [] layout;
}
}
}