Iphone 从AVCaptureAudioDataOutputSampleBufferDelegate播放音频

我正在使用AVCaptureAudioDataOutputSampleBufferDelegate捕获音频

  _captureSession = [[AVCaptureSession alloc] init];
  [self.captureSession setSessionPreset:AVCaptureSessionPresetLow];


  // Setup Audio input
  AVCaptureDevice *audioDevice = [AVCaptureDevice
                                defaultDeviceWithMediaType:AVMediaTypeAudio];
  AVCaptureDeviceInput *captureAudioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:&error];
  if(error){
      NSLog(@"Error Start capture Audio=%@", error);
  }else{
      if ([self.captureSession canAddInput:captureAudioInput]){
          [self.captureSession addInput:captureAudioInput];
      }
  }


  // Setup Audio output
  AVCaptureAudioDataOutput *audioCaptureOutput = [[AVCaptureAudioDataOutput alloc] init];
  if ([self.captureSession canAddOutput:audioCaptureOutput]){
      [self.captureSession addOutput:audioCaptureOutput];
  }
  [audioCaptureOutput release];


  //We create a serial queue 
  dispatch_queue_t audioQueue= dispatch_queue_create("audioQueue", NULL);
  [audioCaptureOutput setSampleBufferDelegate:self queue:audioQueue];
  dispatch_release(audioQueue);


  /*We start the capture*/
  [self.captureSession startRunning];

代表：

  - (void)captureOutput:(AVCaptureOutput *)captureOutput  didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {

  // do something with sampleBuffer
  }

---

问题是如何从sampleBuffer播放音频？

您可以使用以下代码从

CMSampleBufferRef

创建

NSData

，然后使用AVAudioPlayer播放

- (void)captureOutput:(AVCaptureOutput *)captureOutput  didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {

    AudioBufferList audioBufferList;
    NSMutableData *data= [NSMutableData data];
    CMBlockBufferRef blockBuffer;
    CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampleBuffer, NULL, &audioBufferList, sizeof(audioBufferList), NULL, NULL, 0, &blockBuffer);

    for( int y=0; y< audioBufferList.mNumberBuffers; y++ ){

        AudioBuffer audioBuffer = audioBufferList.mBuffers[y];
        Float32 *frame = (Float32*)audioBuffer.mData;

        [data appendBytes:frame length:audioBuffer.mDataByteSize];

    }

    CFRelease(blockBuffer);

    AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithData:data error:nil];
    [player play];
}

-（void）captureOutput:（AVCaptureOutput*）captureOutput didOutputSampleBuffer:（CMSampleBufferRef）SampleBufferfromConnection:（AVCaptureConnection*）连接{
AudioBufferList AudioBufferList；
NSMutableData*数据=[NSMutableData]；
CMBlockBufferRef块缓冲区；
CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer（sampleBuffer，NULL，&audioBufferList，sizeof（audioBufferList），NULL，NULL，0，&blockBuffer）；
对于（int y=0；y

---

不过，我担心这将如何在性能方面发挥作用。也许有更好的方法来完成你想要完成的任务。

有一个问题——“玩家”总是为零。你知道吗？输入一个错误，看看是否有错误。还要确保数据不是nilError:Error Domain=NSOSStatusErrorDomain Code=1954115647“操作无法完成。（OSStatus Error 1954115647。）有什么问题吗？你必须添加一个标题，例如AVAudioPlayer的WAV标题才能理解它是一个声音文件。请参阅Selwyn在的回答，了解功能标题

CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer

为我返回一个-12737的

OSStatus

，根据文档是

kCMSampleBufferError\u ArrayTooSmall

。然后代码在

appendBytes:length:

上崩溃。有什么想法吗？您好，找到解决方案了吗？如果有，请更新答案。您好，新手，没有，仍然在搜索任何解决方案。我也被这个问题困住了没有，仍然没有任何解决方案