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vp3: we only need a temp MV array of size 4

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Originally committed as revision 22497 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad 2010-03-13 05:56:11 +00:00
parent 703acd540e
commit 1c183aa418
1 changed files with 6 additions and 18 deletions
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24
libavcodec/vp3.c
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@ -608,8 +608,8 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
{
int j, k, sb_x, sb_y;
int coding_mode;
int motion_x[6];
int motion_y[6];
int motion_x[4];
int motion_y[4];
int last_motion_x = 0;
int last_motion_y = 0;
int prior_last_motion_x = 0;
@ -620,9 +620,6 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
if (s->keyframe)
return 0;
memset(motion_x, 0, 6 * sizeof(int));
memset(motion_y, 0, 6 * sizeof(int));
/* coding mode 0 is the VLC scheme; 1 is the fixed code scheme */
coding_mode = get_bits1(gb);
@ -670,7 +667,6 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
/* fetch 4 vectors from the bitstream, one for each
* Y fragment, then average for the C fragment vectors */
motion_x[4] = motion_y[4] = 0;
for (k = 0; k < 4; k++) {
current_fragment = BLOCK_Y*s->fragment_width + BLOCK_X;
if (s->all_fragments[current_fragment].coding_method != MODE_COPY) {
@ -687,14 +683,7 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
motion_x[k] = 0;
motion_y[k] = 0;
}
motion_x[4] += motion_x[k];
motion_y[4] += motion_y[k];
}
motion_x[5]=
motion_x[4]= RSHIFT(motion_x[4], 2);
motion_y[5]=
motion_y[4]= RSHIFT(motion_y[4], 2);
break;
case MODE_INTER_LAST_MV:
@ -740,16 +729,15 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
s->all_fragments[current_fragment].motion_y = motion_y[0];
}
}
if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
motion_x[0] = RSHIFT(motion_x[0] + motion_x[1] + motion_x[2] + motion_x[3], 2);
motion_y[0] = RSHIFT(motion_y[0] + motion_y[1] + motion_y[2] + motion_y[3], 2);
}
for (k = 0; k < 2; k++) {
current_fragment = s->fragment_start[k+1] +
mb_y*(s->fragment_width>>1) + mb_x;
if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
s->all_fragments[current_fragment].motion_x = motion_x[k+4];
s->all_fragments[current_fragment].motion_y = motion_y[k+4];
} else {
s->all_fragments[current_fragment].motion_x = motion_x[0];
s->all_fragments[current_fragment].motion_y = motion_y[0];
}
}
}
}