[xine-devel] shm stuff in video decoder

[Mike M. <mel...@pc...>]

Hi team,
	I am writing some documentation on building a new video decoder.
Here is one thing I do not understand about the flow of a video decoder (I
have this piece of code commented out in foovideo.c):

      if (img->copy) {

        int height = abs(this->biHeight);
        int stride = this->biWidth;
        uint8_t* src[3];

        src[0] = img->base[0];
        src[1] = img->base[1];
        src[2] = img->base[2];
        while ((height -= 16) >= 0) {
          img->copy(img, src);
          src[0] += 16 * stride;
          src[1] +=  4 * stride;
          src[2] +=  4 * stride;
        }
      }

What is this for and when is it used? Should it always be part of every
video decoder?

	Thanks...
--
	-Mike Melanson