p = data->y;
  q = buffer->planes[PLANE_Y];
  for (i = 0; i < buffer->d_h; ++i) {
    memcpy(p, q, buffer->d_w);
    p += buffer->d_w;
    q += buffer->stride[PLANE_Y];
  }

  p = data->u;
  q = buffer->planes[PLANE_V];
  p2 = data->v;
  q2 = buffer->planes[PLANE_U];
  for (i = 0; i < buffer->d_h>>1; ++i) {
    memcpy(p, q, buffer->d_w>>1);
    memcpy(p2, q2, buffer->d_w>>1);
    p += buffer->d_w>>1;
    p2 += buffer->d_w>>1;
    q += buffer->stride[PLANE_V];
    q2 += buffer->stride[PLANE_U];
  }