我正在开发一个应用程序,我需要通过输出音频插孔通过音频捕获,同时记录和保存视频.
我已经研究了aurio touch apple示例代码并实现了音频传输.
我也通过AVCaptureSession实现了录像.
以上功能单独完成和工作完美.
但是当我合并功能音频通过不工作,因为AVCapturesession的音频会话.
我也试图通过我从AVCaptureSession代理方法得到的音频数据.以下是我的代码：
OSStatus err = noErr; AudioBufferList audioBufferList; CMBlockBufferRef blockBuffer; CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampleBuffer,NULL,&audioBufferList,sizeof(audioBufferList),&blockBuffer); CMItemCount numberOfFrames = CMSampleBufferGetNumSamples(sampleBuffer); // corresponds to the number of CoreAudio audio frames currentSampleTime += (double)numberOfFrames; AudioTimeStamp timeStamp; memset(&timeStamp,sizeof(AudioTimeStamp)); timeStamp.mSampleTime = currentSampleTime; timeStamp.mFlags |= kAudioTimeStampSampleTimeValid; AudioUnitRenderActionFlags flags = 0; aurioTouchAppDelegate *THIS = (aurioTouchAppDelegate *)[[UIApplication sharedApplication]delegate]; err = AudioUnitRender(self.rIoUnit,&flags,&timeStamp,1,numberOfFrames,&audioBufferList); if (err) { printf("PerformThru: error %d\n",(int)err); }
解决方法
这里有一些更好的错误处理代码.它返回什么错误？您可以在文档中搜索错误描述.
static void CheckError (OSStatus error,const char *operation) {
if (error == noErr) return;
char str[20] = {};
// see if it appears to be a 4 char code
*(UInt32*)(str + 1) = CFSwapInt32HostToBig(error);
if (isprint(str[1]) && isprint(str[2]) && isprint(str[3]) && isprint(str[4])) {
str[0] = str[5] = '\'';
str[6] = '\0';
} else {
sprintf(str,"%d",(int)error);
}
fprintf(stderr,"Error: %s(%s)\n",operation,str);
exit(1);
}
- (void)yourFunction
{
AudioBufferList audioBufferList;
CMBlockBufferRef blockBuffer;
CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampleBuffer,&blockBuffer);
CMItemCount numberOfFrames = CMSampleBufferGetNumSamples(sampleBuffer); // corresponds to the number of CoreAudio audio frames
currentSampleTime += (double)numberOfFrames;
AudioTimeStamp timeStamp;
memset(&timeStamp,sizeof(AudioTimeStamp));
timeStamp.mSampleTime = currentSampleTime;
timeStamp.mFlags |= kAudioTimeStampSampleTimeValid;
AudioUnitRenderActionFlags flags = 0;
aurioTouchAppDelegate *THIS = (aurioTouchAppDelegate *)[[UIApplication sharedApplication]delegate];
CheckError(AudioUnitRender(self.rIoUnit,&audioBufferList),"Error with AudioUnitRender");
}
