[Libav-user] get RGB values from ffmpeg frame

Navin nkipe at tatapowersed.com
Mon Nov 26 15:19:23 CET 2012

Sorry, the correct code (with the necessary typedefs) is as such:

#include <Windows.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswscale/swscale.h>

typedef SwsContext* (__cdecl *__sws_getContext)(int srcW, int srcH, enum 
AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat 
dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const 
double *param);
typedef int (__cdecl *__sws_scale)(struct SwsContext *c, const uint8_t 
*const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, 
uint8_t *const dst[], const int dstStride[]);
typedef int (__cdecl *__avpicture_fill)(AVPicture *picture, uint8_t 
*ptr, enum AVPixelFormat pix_fmt, int width, int height);

int main()
     const char * swsDLLpointer = 
     const char * avcDLLpointer = 
     HINSTANCE hinstLib_swscale  = LoadLibrary(swsDLLpointer);
     HINSTANCE hinstLib_avcodec  = LoadLibrary(avcDLLpointer);

     __avpicture_fill       avpicture_fill_proc         = 
(__avpicture_fill)        GetProcAddress(hinstLib_avcodec,  
     __sws_getContext       sws_getContext_proc         = 
(__sws_getContext)        GetProcAddress(hinstLib_swscale,  
     __sws_scale            sws_scale_proc              = 
(__sws_scale)             GetProcAddress(hinstLib_swscale,  "sws_scale");

...blah blah...
   sws_ctx = sws_getContext_proc(pCodecCtx->width, pCodecCtx->height, 
pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_RGB24, 
   avpicture_fill_proc((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24, 
pCodecCtx->width, pCodecCtx->height);
...blah blah...
sws_scale_proc(sws_ctx, (uint8_t const * const *)pFrame->data, 
pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, 
pFrameRGB->linesize );
             for(int yy = 0; yy < pCodecCtx->height; ++yy)
                 for(int xx = 0; xx < pCodecCtx->width; ++xx)
                     int p = xx * 3 + yy * pFrameRGB->linesize[0];
                     int r = pFrameRGB->data[0][p];
                     int g = pFrameRGB->data[0][p+1];
                     int b = pFrameRGB->data[0][p+2];
...blah blah...

It's basically that simple to get RGB values.


On 11/22/2012 4:32 AM, Carl Eugen Hoyos wrote:
> Malik Cissé<mc at ...>  writes:
>> Carl Eugen ... writes:
>>> ...compile FFmpeg with msvc.
>> This sounds interesting. Where can I find msvc sample project?
> Please see the MSVC section on the platform page
> of the fine documentation to find information on
> how to compile FFmpeg with MSVC.
> Carl Eugen
> _______________________________________________
> Libav-user mailing list
> Libav-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/libav-user

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