ios – 将CMSampleBufferRef缓冲到CFArray中

2023年4月1日 230次阅读

我正在尝试收集我从iPhone的摄像机收到的数组150 CMSampleBufferRef.

            不知何故,相机在13个缓冲区后停止呼叫代表.

    我尝试过使用NSMutableArray,CFArray.没什么帮助.

    我怀疑它有内存但我对内存警告一无所知.

我很乐意为此提供一些帮助.
    谢谢你.

            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];

那是我的StartRecording方法.

        - (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是缓冲区收集方法.

最佳答案 你想做什么？

AVFoundation将CMSampleBuffer传递给硬件编码器.我的理论是当它没有检测到传入的帧时,它只是停止传递你的帧.

相反,尝试将CVPixelBufferRef存储在CVPixelBufferPool中.

CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
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