X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmpeg4videodec.c;h=0e549ef11620959411f1ad0d14465eec244930a4;hb=b921b3b42b61a3dff19157bf3eec1f6f38a2cae7;hp=1a2771a1f9a9b40d43e69521f267d0416e8eae24;hpb=711b7b77763cd55d5584ae82ce5cae6d4718092d;p=ffmpeg

diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index 1a2771a1f9a..0e549ef1162 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -315,13 +315,13 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g
         min_ab = FFMIN(alpha, beta);
         w3     = w2 >> min_ab;
         h3     = h2 >> min_ab;
-        s->sprite_offset[0][0] = (sprite_ref[0][0] << (alpha + beta + rho - min_ab)) +
+        s->sprite_offset[0][0] = (sprite_ref[0][0] * (1<<(alpha + beta + rho - min_ab))) +
                                  (-r * sprite_ref[0][0] + virtual_ref[0][0]) *
                                  h3 * (-vop_ref[0][0]) +
                                  (-r * sprite_ref[0][0] + virtual_ref[1][0]) *
                                  w3 * (-vop_ref[0][1]) +
                                  (1 << (alpha + beta + rho - min_ab - 1));
-        s->sprite_offset[0][1] = (sprite_ref[0][1] << (alpha + beta + rho - min_ab)) +
+        s->sprite_offset[0][1] = (sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
                                  (-r * sprite_ref[0][1] + virtual_ref[0][1]) *
                                  h3 * (-vop_ref[0][0]) +
                                  (-r * sprite_ref[0][1] + virtual_ref[1][1]) *
@@ -368,10 +368,10 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g
         int shift_y = 16 - ctx->sprite_shift[0];
         int shift_c = 16 - ctx->sprite_shift[1];
         for (i = 0; i < 2; i++) {
-            s->sprite_offset[0][i] <<= shift_y;
-            s->sprite_offset[1][i] <<= shift_c;
-            s->sprite_delta[0][i]  <<= shift_y;
-            s->sprite_delta[1][i]  <<= shift_y;
+            s->sprite_offset[0][i] *= 1 << shift_y;
+            s->sprite_offset[1][i] *= 1 << shift_c;
+            s->sprite_delta[0][i]  *= 1 << shift_y;
+            s->sprite_delta[1][i]  *= 1 << shift_y;
             ctx->sprite_shift[i]     = 16;
         }
         s->real_sprite_warping_points = ctx->num_sprite_warping_points;
@@ -2788,6 +2788,7 @@ AVCodec ff_mpeg4_decoder = {
     .capabilities          = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
                              AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
                              AV_CODEC_CAP_FRAME_THREADS,
+    .caps_internal         = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
     .flush                 = ff_mpeg_flush,
     .max_lowres            = 3,
     .pix_fmts              = ff_h263_hwaccel_pixfmt_list_420,