Le mar. 19 nov. 2024 à 00:39, Mathieu Prevot <[email protected]> a écrit :
> > > Le dim. 17 nov. 2024 à 20:57, Mathieu Prevot <[email protected]> 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 ? > I got no answer from libav-user@, maybe is it a question for ffmpeg-devel@ (not subscribed, please cc) ? Regards
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