将CMSampleBufferRef数据传递到音频输出插孔
将CMSampleBufferRef数据传递到音频输出插孔
提问于 2013-03-20 02:22:09
我正在开发一个应用程序，我需要通过音频采集通过输出音频插孔，同时记录和保存视频。
我已经研究了苹果的aurio touch示例代码，并实现了音频直通。
我还通过AVCaptureSession实现了视频录制。以上两种功能都是单独完成的，效果很好。
但是当我合并功能时，由于AVCapturesession的音频会话，音频传递无法正常工作。
我还尝试传递从AVCaptureSession委托方法中获得的音频数据。下面是我的代码：
OSStatus err = noErr;
AudioBufferList audioBufferList;
CMBlockBufferRef blockBuffer;
CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampleBuffer, NULL, &audioBufferList, sizeof(audioBufferList), NULL, NULL, 0, &blockBuffer);
CMItemCount numberOfFrames = CMSampleBufferGetNumSamples(sampleBuffer); // corresponds to the number of CoreAudio audio frames
currentSampleTime += (double)numberOfFrames;
AudioTimeStamp timeStamp;
memset(&timeStamp, 0, 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); }但它给出了错误。请尽快告知我们还可以做些什么。我查阅了这么多文档和代码，但没有找到任何解决方案。请帮帮我..
Stack Overflow用户
发布于 2014-01-15 06:56:17
下面是一些更好的错误处理代码。它返回什么错误？您可以通过在文档中搜索错误描述来查找它。
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, NULL, &audioBufferList, sizeof(audioBufferList), NULL, NULL, 0, &blockBuffer);
CMItemCount numberOfFrames = CMSampleBufferGetNumSamples(sampleBuffer); // corresponds to the number of CoreAudio audio frames
currentSampleTime += (double)numberOfFrames;
AudioTimeStamp timeStamp;
memset(&timeStamp, 0, sizeof(AudioTimeStamp));
timeStamp.mSampleTime = currentSampleTime;
timeStamp.mFlags |= kAudioTimeStampSampleTimeValid;
AudioUnitRenderActionFlags flags = 0;
aurioTouchAppDelegate *THIS = (aurioTouchAppDelegate *)[[UIApplication sharedApplication]delegate];
CheckError(AudioUnitRender(self.rioUnit, &flags, &timeStamp, 1, numberOfFrames, &audioBufferList),
"Error with AudioUnitRender");
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/15507479
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