| Hi,
I am trying to restructure my audiograph to add a callback between the fileplayerAU and the mixerAU.
So far, I am building the graph as before, but not connecting the node from the fileplayer output to the mixer input bus. I'm setting the callback on the mixer bus as follows:
AURenderCallbackStruct filePlayerCallbackStruct;
filePlayerCallbackStruct.inputProc = &filePlayerCallback;
filePlayerCallbackStruct.inputProcRefCon = soundStructArray;
UInt32 busNumber = 0;
NSLog (@"Registering the render callback with mixer unit input bus %u", busNumber);
// Set a callback for the specified node's specified input
result = AUGraphSetNodeInputCallback (
processingGraph,
mixerNode,
busNumber,
&filePlayerCallbackStruct
);
if (noErr != result) {[self printErrorMessage: @"AUGraphSetNodeInputCallback" withStatus: result]; return;}
In the callback function I am using
renderErr = AudioUnitRender(fileplayerUnit, ioActionFlags,
inTimeStamp, bus1, inNumberFrames, ioData);
if (renderErr < 0) {
return renderErr;
With this graph structure, setting the kAudioUnitProperty_ScheduledFileRegion on the fileplayer fails. If I revert to the normal node connection, it works.
Do I need to explicitly set the ASBD on the mixer input bus?
any suggestions would be appreciated.
thanks
Robert Carroll RSM Records Toronto
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