[Libav-user] BGR24 to YUV pixel conversion

[Neil Menne]

   //begin relevant code here
   mSwsContext  = sws_getContext(input_width,
                                 input_height,
                                 input_pixel_format,
                                 output_width,
                                 output_height,
                                 output_pixel_format,
                                 SWS_BICUBIC,
                                 NULL,
                                 NULL,
                                 NULL);

   AVPicture input_picture;
   avpicture_alloc(&input_picture,
                   input_pixel_format, //AV_PIX_FMT_BGR24
                   input_width, //656
                   input_height); //354

   ret = avpicture_fill(&input_picture,
                        data,
                        input_pixel_format,
                        input_width,
                        input_height);

   AVPicture output_picture;
   avpicture_alloc(&output_picture,
                   output_pixel_format,
                   output_width,
                   output_height);

   if (mSwsContext != NULL)
   {
      ret = sws_scale(mSwsContext,
                      input_picture.data,
                      input_picture.linesize,
                      0,
                      input_height,
                      output_picture.data,
                      output_picture.linesize);

      //ret here is always 0
   }

   //etc....


On Tue, Apr 23, 2013 at 10:21 AM, Neil Menne
<nhmenne42 at students.tntech.edu>wrote:

> I'm trying to convert a raw image that I receive as a unsigned character
> array. I then create (via avpicture_alloc) two AVPictures (one for the
> source and one for the destination). I then do an avpicture_fill for the
> input using the unsigned character array. The value returned by
> avpicture_fill matches the size of the original image.
>
> When I do the sws_scale, I get a printout saying "bad src image pointers"
> which comes from the check_image_pointers function in sws_scale. My
> question is this: How is this happening? I'm filling an allocated picture.
> Where is the disconnect?
>
> Thanks in advance, guys.
>
> -Neil
>
> P.S. here's the relevant snippet of code
>
>
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