如何在回调函数中调用目标c函数
回调函数:
static OSStatus inputRenderCallback (
void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData
) {
soundStructPtr soundStructPointerArray = (soundStructPtr) inRefCon;
UInt32 frameTotalForSound = soundStructPointerArray[inBusNumber].frameCount;
BOOL isStereo = soundStructPointerArray[inBusNumber].isStereo;
AudioUnitSampleType *dataInLeft;
AudioUnitSampleType *dataInRight;
dataInLeft = soundStructPointerArray[inBusNumber].audioDataLeft;
if (isStereo) dataInRight = soundStructPointerArray[inBusNumber].audioDataRight;
AudioUnitSampleType *outSamplesChannelLeft;
AudioUnitSampleType *outSamplesChannelRight;
outSamplesChannelLeft = (AudioUnitSampleType *) ioData->mBuffers[0].mData;
if (isStereo) outSamplesChannelRight = (AudioUnitSampleType *) ioData->mBuffers[1].mData;
UInt32 sampleNumber = soundStructPointerArray[inBusNumber].sampleNumber;
for (UInt32 frameNumber = 0; frameNumber < inNumberFrames; ++frameNumber) {
outSamplesChannelLeft[frameNumber] = dataInLeft[sampleNumber];
if (isStereo) outSamplesChannelRight[frameNumber] = dataInRight[sampleNumber];
sampleNumber++;
if (sampleNumber >= frameTotalForSound){
sampleNumber = 0;
}
}
soundStructPointerArray[inBusNumber].sampleNumber = sampleNumber;
return noErr;
}
目标c函数:
- (void) stopAUGraph {
NSLog (@"Stopping audio processing graph");
Boolean isRunning = false;
OSStatus result = AUGraphIsRunning (processingGraph, &isRunning);
if (noErr != result) {[self printErrorMessage: @"AUGraphIsRunning" withStatus: result]; return;}
if (isRunning) {
result = AUGraphStop (processingGraph);
if (noErr != result) {[self printErrorMessage: @"AUGraphStop" withStatus: result]; return;}
self.playing = NO;
}
}
现在在
if (sampleNumber >= frameTotalForSound){
sampleNumber = 0;
}
回调函数部分如何调用 stopAUGraph 函数