CAOpenGLLayer中的摄像机视频流

Question

我想要实现的是获取未压缩的相机视频流并将其转换为OpenGL纹理，以在CAOpenGLLayer中显示它。这是正确的流程吗？

我想使用与提议的here类似的tecnique来显示电影视频帧，但下面的片段不起作用，最后tex的coords都为零。

是否有一些例子指出我正确的方向？

- (void) awakeFromNib {

    QTCaptureSession *session = [[QTCaptureSession alloc] init];
    QTCaptureDevice *iSight = [QTCaptureDevice defaultInputDeviceWithMediaType:QTMediaTypeVideo];
    [iSight open:nil];

    QTCaptureDeviceInput *myInput = [QTCaptureDeviceInput deviceInputWithDevice:iSight];
    QTCaptureDecompressedVideoOutput *mCaptureDecompressedVideoOutput = [[QTCaptureDecompressedVideoOutput alloc] init];
    [mCaptureDecompressedVideoOutput setDelegate:self];

    [session addInput:myInput error:nil];
    [session addOutput:mCaptureDecompressedVideoOutput error:nil];
    [session startRunning];
}

- (void)captureOutput:(QTCaptureOutput *)captureOutput didOutputVideoFrame:(CVImageBufferRef)videoFrame withSampleBuffer:(QTSampleBuffer *)sampleBuffer fromConnection:(QTCaptureConnection *)connection
{
    GLfloat                 lowerLeft[2];
    GLfloat                 lowerRight[2];
    GLfloat                 upperRight[2];
    GLfloat                 upperLeft[2];   

    CVOpenGLTextureGetCleanTexCoords(imageBuffer, lowerLeft, lowerRight, upperRight, upperLeft);
}

Answer 1

更好地查看来自Xcode的示例代码，有一个名为LiveVideoMixer的项目可能可以帮助你。