add zerocopy

zhangmeng

2019-11-20 dc65b072a13994ff02cc7b54f3b00ba087e7f86a

 csrc/thirdparty/ffmpeg/include/libavutil/hwcontext_cuda.h

@@ -41,6 +41,7 @@
 */
typedef struct AVCUDADeviceContext {
    CUcontext cuda_ctx;
    CUstream stream;
    AVCUDADeviceContextInternal *internal;
} AVCUDADeviceContext;