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POAccess Images and Audio with AVFoundation
 

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  1. POAccess Images and Audio with AVFoundation
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    <p>I am using AVFoundation for accessing images and audio for making video. Problem is when i am adding device for audio like.</p> <pre><code>AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeAudio]; AVCaptureDeviceInput * microphone_input = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:nil]; AVCaptureAudioDataOutput * audio_output = [[AVCaptureAudioDataOutput alloc] init]; [self.captureSession2 addInput:microphone_input]; [self.captureSession2 addOutput:audio_output]; dispatch_queue_t queue2; queue2 = dispatch_queue_create("Audio", NULL); [audio_output setSampleBufferDelegate:self queue:queue2]; dispatch_release(queue2); </code></pre> <p>and Camera for images.</p> <pre><code>AVCaptureDevice *cameraDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; //putting it on the input. AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:cameraDevice error:nil]; //selecting the Output. AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init]; [self.captureSession addInput:captureInput]; [self.captureSession addOutput:captureOutput]; dispatch_queue_t queue; queue = dispatch_queue_create("cameraQueue", 0); [captureOutput setSampleBufferDelegate:self queue:queue]; dispatch_release(queue); </code></pre> <p>and after all getting raw data through delegates</p> <pre><code>- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { if ([captureOutput isKindOfClass:[AVCaptureAudioDataOutput class]]) [self sendAudeoRaw:sampleBuffer]; if ([captureOutput isKindOfClass:[AVCaptureVideoDataOutput class]]) [self sendVideoRaw:sampleBuffer];} </code></pre> <p><strong>the speed of getting Images Raw data is very slow around 2 images per second. how can i improve it because i am looking around 10-12 images/second. please Help</strong></p>
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    1. COWhat is `[self sendVideoRaw:sampleBuffer]`?
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      1. POAccess Images and Audio with AVFoundation
      1. USSteve McFarlin
    2. COAlso, you could in your captureOutput code simply compare the pointers rather then using isKindOfClass. e.g. `if(captureOutput == audio_output)`. You do have to be careful with isKindOfClass. It can return something you may not be expecting. This generally only occurs with the container classes. See this [post](http://stackoverflow.com/questions/1096772/is-it-safe-to-use-iskindofclass-against-an-nsstring-instance-to-determine-type) for a discussion. One last think. You do not need to use two different capture sessions for audio and video. Both AV IO classes can be added to the same session.
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      1. POAccess Images and Audio with AVFoundation
      1. USSteve McFarlin
    3. CO@SteveMcFarlin separating audio and image raw data for processing.
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