示例#1
0
        public void captureSetup(iVideoTrack videoTrack, int decodedBuffersCount, sDecodedVideoSize decodedSize)
        {
            this.decodedSize = decodedSize;
            if (pendingFrames.capacity != decodedBuffersCount)
            {
                pendingFrames = new PendingFrames(decodedBuffersCount);
            }

            // Set decoded format. Pi4 Linux failed to implement V4L2 stateful decoder setup workflow, instead computing everything manually, from parsed SPS.
            sPixelFormatMP sdf = computeDecodedFormat(ref decodedSize);

            device.setDataFormat(eBufferType.VideoCaptureMPlane, ref sdf);

            // Apparently, Pi4 hardware or drivers is unable to process S_SELECTION request and crop the video. Cropping it later while rendering NV12 into RGB.

            /* sSelection selection = default;
             * selection.type = eBufferType.VideoCaptureMPlane;
             * selection.target = eSelectionTarget.Compose;
             * selection.flags = eSelectionFlags.LesserOrEqual;
             * selection.rect = decodedSize.cropRect;
             * device.file.call( eControlCode.S_SELECTION, ref selection );
             * device.file.call( eControlCode.G_SELECTION, ref selection );
             * CRect selectedRect = selection.rect;
             * if( selectedRect == decodedSize.cropRect )
             *      Logger.logVerbose( "Video cropping: decoded size {0}, cropped to {1}", decodedSize.size, selectedRect );
             * else
             *      Logger.logInfo( "Video cropping: decoded size {0}, asked to crop to {1}, GPU driver replaced with {2}", decodedSize.size, decodedSize.cropRect, selectedRect ); */

            sdf     = device.getDataFormat(eBufferType.VideoCaptureMPlane);
            decoded = new DecodedQueue(device, decodedBuffersCount);
            // decoded.exportTextures( renderDev, device, ref sdf );

            // Start streaming of the output queue
            device.startStreaming(eBufferType.VideoCaptureMPlane);
        }