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theoradec: skip decoding of uncoded MV in 4MV code

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Thusnelda, the new experimental Theora encoder is using this Theora feature
that was previously not exploited.
fixes issue579

Originally committed as revision 15166 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-09-03 00:17:11 +00:00
parent e32e2d56d4
commit feaf1a7393
1 changed files with 9 additions and 1 deletions
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10
libavcodec/vp3.c
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@ -963,7 +963,7 @@ static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
*/
static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
{
int i, j, k;
int i, j, k, l;
int coding_mode;
int motion_x[6];
int motion_y[6];
@ -1047,6 +1047,10 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
* Y fragment, then average for the C fragment vectors */
motion_x[4] = motion_y[4] = 0;
for (k = 0; k < 4; k++) {
for (l = 0; l < s->coded_fragment_list_index; l++)
if (s->coded_fragment_list[l] == s->macroblock_fragments[6*current_macroblock + k])
break;
if (l < s->coded_fragment_list_index) {
if (coding_mode == 0) {
motion_x[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
motion_y[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
@ -1056,6 +1060,10 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
}
last_motion_x = motion_x[k];
last_motion_y = motion_y[k];
} else {
motion_x[k] = 0;
motion_y[k] = 0;
}
motion_x[4] += motion_x[k];
motion_y[4] += motion_y[k];
}