CODEWITHSUNDEEP
iosavfoundationquicktime
Gal
Gal

Reputation: 381

Buffering CMSampleBufferRef into a CFArray

I'm trying to collect into an array 150 CMSampleBufferRef that i recieve from my iPhone's Video Camera. Somehow the camera stops calling the delegate after 13 buffers. I tried working with NSMutableArray, CFArray. nothing helped. I suspect it something with memory but i get nothing about memory warning.

I'll be happy for some help with that.
Thanks ahead.

            session = [[AVCaptureSession alloc]init];
            //Quality Preset
            if ([session canSetSessionPreset:AVCaptureSessionPresetLow]) {
                session.sessionPreset = AVCaptureSessionPresetLow;
            }


            [session beginConfiguration];
            AVCaptureDevice *videoDevice = [AVCaptureDevice   defaultDeviceWithMediaType:AVMediaTypeVideo];
            AVCaptureDeviceInput *newVideoDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:nil];

            AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];

            output.videoSettings = @{ (NSString *)kCVPixelBufferPixelFormatTypeKey : @(kCVPixelFormatType_32BGRA) };
            dispatch_queue_t queue = dispatch_queue_create("MyQueue", NULL);
            [output setSampleBufferDelegate:self queue:queue];

            [session addOutput:output];
            [session addInput:newVideoDeviceInput];
            AVCaptureConnection *conn = [output connectionWithMediaType:AVMediaTypeVideo];



            if (conn.supportsVideoMinFrameDuration)
                conn.videoMinFrameDuration = CMTimeMake(1, 10);
            if (conn.supportsVideoMaxFrameDuration)
                conn.videoMaxFrameDuration = CMTimeMake(1, 10);


            [session commitConfiguration];

            arr = CFArrayCreateMutable( NULL, 150, &kCFTypeArrayCallBacks );
            counter=0;
            [session startRunning];

That was my StartRecording method.

        - (void)captureOutput:(AVCaptureOutput *)captureOutput
        didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
               fromConnection:(AVCaptureConnection *)connection {
            if (counter==150) {
        [self StopRecording:nil];
        return;
    }
            CFArrayInsertValueAtIndex(arr, counter, sampleBuffer);

            counter= (counter+1)%150;

        }
        @end

Tha's the buffer collection method.

Upvotes: 4

Views: 940

Answers (1)

JorisT
JorisT

Reputation: 1552

What are you trying todo? AVFoundation passes the CMSampleBuffer to the hardware encoder. My theory is when it doesn't detect incoming frames, it just stops passing you frames. Instead, try storing CVPixelBufferRef in a CVPixelBufferPool.

CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

Upvotes: 2

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