static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb) { YuvPixel p; int y, y0; for (y = 0; y < mp->avctx->height; ++y) { if (mp->changes_map[y * mp->avctx->width] != 0) { memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); p = mp_get_yuv_from_rgb(mp, 0, y); } else { p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb)); p.y = av_clip(p.y, 0, 31); if ((y & 3) == 0) { p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); p.v = av_clip(p.v, -32, 31); p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); p.u = av_clip(p.u, -32, 31); } mp->vpt[y] = p; mp_set_rgb_from_yuv(mp, 0, y, &p); } } for (y0 = 0; y0 < 2; ++y0) for (y = y0; y < mp->avctx->height; y += 2) mp_decode_line(mp, gb, y); }