Le dim. 17 nov. 2024 à 20:57, Mathieu Prevot <mathieu.pre...@gmail.com> a écrit :
> Hello, > > I am using code, based on > https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/hw_decode.c, > but I am not transferring the decoded data to the host, I keep it on the > device for later use with cuda code (my goal will be to use RGB 8-12 bits > per channel data). > > I could not find a way to get the data format > ((AVPixelFormat)frame->format translates to: "HW acceleration through CUDA. > data[i] contain CUdeviceptr pointers exactly as for system memory frames.") > > I understand that I have two arrays: frame->data[0] and frame->data[1]. > > I would like to translate the data into a cuda native structure like: > > cudaPitchedPtr CUdeviceptr{}; > CUdeviceptr.ptr = frame->data[0]; > CUdeviceptr.ysize = frame->height; > CUdeviceptr.xsize = frame->width; > > Which is probably wrong, since width==1920 height==1080 and should have > colors or YUV data. > > How to get to know the data format (RGB, BGR, YUV, 8/10/12bits per channel > etc) and the size of the array ? > If it is not RGB8 (or 10-12), can I get that through some ffmpeg > implementation, maybe with an nvdec based function ? > What is the correct cuda-native data ? cudaPitchedPtr or something else ? > frame->data[0] is uint8_t, but the array is probably something else in the > general case; so what is it (as redundancy or extension of "what is the > data format") ? > It seems that frame->data[0] is the Y component of YUV, if not, one of RGB channels, but I could not figure out what frame->data[1] is. Can someone confirm ?
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