20 |
* along with this program ; if not, write to the Free Software |
* along with this program ; if not, write to the Free Software |
21 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
22 |
* |
* |
23 |
* $Id: decoder.c,v 1.71 2005-05-23 09:29:43 Skal Exp $ |
* $Id: decoder.c,v 1.72 2005-08-01 18:37:46 Isibaar Exp $ |
24 |
* |
* |
25 |
****************************************************************************/ |
****************************************************************************/ |
26 |
|
|
443 |
CHECK_MV(mv[3]); |
CHECK_MV(mv[3]); |
444 |
} |
} |
445 |
|
|
446 |
|
/* Up to this version, chroma rounding was wrong with qpel. |
447 |
|
* So we try to be backward compatible to avoid artifacts */ |
448 |
|
#define BS_VERSION_BUGGY_CHROMA_ROUNDING 1 |
449 |
|
|
450 |
/* decode an inter macroblock */ |
/* decode an inter macroblock */ |
451 |
static void |
static void |
452 |
decoder_mbinter(DECODER * dec, |
decoder_mbinter(DECODER * dec, |
482 |
uv_dx = mv[0].x; |
uv_dx = mv[0].x; |
483 |
uv_dy = mv[0].y; |
uv_dy = mv[0].y; |
484 |
if (dec->quarterpel) { |
if (dec->quarterpel) { |
485 |
|
if (dec->bs_version <= BS_VERSION_BUGGY_CHROMA_ROUNDING) { |
486 |
|
uv_dx = (uv_dx>>1) | (uv_dx&1); |
487 |
|
uv_dy = (uv_dy>>1) | (uv_dy&1); |
488 |
|
} |
489 |
|
else { |
490 |
uv_dx /= 2; |
uv_dx /= 2; |
491 |
uv_dy /= 2; |
uv_dy /= 2; |
492 |
} |
} |
493 |
|
} |
494 |
uv_dx = (uv_dx >> 1) + roundtab_79[uv_dx & 0x3]; |
uv_dx = (uv_dx >> 1) + roundtab_79[uv_dx & 0x3]; |
495 |
uv_dy = (uv_dy >> 1) + roundtab_79[uv_dy & 0x3]; |
uv_dy = (uv_dy >> 1) + roundtab_79[uv_dy & 0x3]; |
496 |
|
|
505 |
} else { /* MODE_INTER4V */ |
} else { /* MODE_INTER4V */ |
506 |
|
|
507 |
if(dec->quarterpel) { |
if(dec->quarterpel) { |
508 |
|
if (dec->bs_version <= BS_VERSION_BUGGY_CHROMA_ROUNDING) { |
509 |
|
int z; |
510 |
|
uv_dx = 0; uv_dy = 0; |
511 |
|
for (z = 0; z < 4; z++) { |
512 |
|
uv_dx += ((mv[z].x>>1) | (mv[z].x&1)); |
513 |
|
uv_dy += ((mv[z].y>>1) | (mv[z].y&1)); |
514 |
|
} |
515 |
|
} |
516 |
|
else { |
517 |
uv_dx = (mv[0].x / 2) + (mv[1].x / 2) + (mv[2].x / 2) + (mv[3].x / 2); |
uv_dx = (mv[0].x / 2) + (mv[1].x / 2) + (mv[2].x / 2) + (mv[3].x / 2); |
518 |
uv_dy = (mv[0].y / 2) + (mv[1].y / 2) + (mv[2].y / 2) + (mv[3].y / 2); |
uv_dy = (mv[0].y / 2) + (mv[1].y / 2) + (mv[2].y / 2) + (mv[3].y / 2); |
519 |
|
} |
520 |
} else { |
} else { |
521 |
uv_dx = mv[0].x + mv[1].x + mv[2].x + mv[3].x; |
uv_dx = mv[0].x + mv[1].x + mv[2].x + mv[3].x; |
522 |
uv_dy = mv[0].y + mv[1].y + mv[2].y + mv[3].y; |
uv_dy = mv[0].y + mv[1].y + mv[2].y + mv[3].y; |
968 |
b_uv_dy = pMB->b_mvs[0].y; |
b_uv_dy = pMB->b_mvs[0].y; |
969 |
|
|
970 |
if (dec->quarterpel) { |
if (dec->quarterpel) { |
971 |
|
if (dec->bs_version <= BS_VERSION_BUGGY_CHROMA_ROUNDING) { |
972 |
|
uv_dx = (uv_dx>>1) | (uv_dx&1); |
973 |
|
uv_dy = (uv_dy>>1) | (uv_dy&1); |
974 |
|
b_uv_dx = (b_uv_dx>>1) | (b_uv_dx&1); |
975 |
|
b_uv_dy = (b_uv_dy>>1) | (b_uv_dy&1); |
976 |
|
} |
977 |
|
else { |
978 |
uv_dx /= 2; |
uv_dx /= 2; |
979 |
uv_dy /= 2; |
uv_dy /= 2; |
980 |
b_uv_dx /= 2; |
b_uv_dx /= 2; |
981 |
b_uv_dy /= 2; |
b_uv_dy /= 2; |
982 |
} |
} |
983 |
|
} |
984 |
|
|
985 |
uv_dx = (uv_dx >> 1) + roundtab_79[uv_dx & 0x3]; |
uv_dx = (uv_dx >> 1) + roundtab_79[uv_dx & 0x3]; |
986 |
uv_dy = (uv_dy >> 1) + roundtab_79[uv_dy & 0x3]; |
uv_dy = (uv_dy >> 1) + roundtab_79[uv_dy & 0x3]; |
994 |
b_uv_dy = pMB->b_mvs[0].y + pMB->b_mvs[1].y + pMB->b_mvs[2].y + pMB->b_mvs[3].y; |
b_uv_dy = pMB->b_mvs[0].y + pMB->b_mvs[1].y + pMB->b_mvs[2].y + pMB->b_mvs[3].y; |
995 |
|
|
996 |
if (dec->quarterpel) { |
if (dec->quarterpel) { |
997 |
|
if (dec->bs_version <= BS_VERSION_BUGGY_CHROMA_ROUNDING) { |
998 |
|
uv_dx = (uv_dx>>1) | (uv_dx&1); |
999 |
|
uv_dy = (uv_dy>>1) | (uv_dy&1); |
1000 |
|
b_uv_dx = (b_uv_dx>>1) | (b_uv_dx&1); |
1001 |
|
b_uv_dy = (b_uv_dy>>1) | (b_uv_dy&1); |
1002 |
|
} |
1003 |
|
else { |
1004 |
uv_dx /= 2; |
uv_dx /= 2; |
1005 |
uv_dy /= 2; |
uv_dy /= 2; |
1006 |
b_uv_dx /= 2; |
b_uv_dx /= 2; |
1007 |
b_uv_dy /= 2; |
b_uv_dy /= 2; |
1008 |
} |
} |
1009 |
|
} |
1010 |
|
|
1011 |
uv_dx = (uv_dx >> 3) + roundtab_76[uv_dx & 0xf]; |
uv_dx = (uv_dx >> 3) + roundtab_76[uv_dx & 0xf]; |
1012 |
uv_dy = (uv_dy >> 3) + roundtab_76[uv_dy & 0xf]; |
uv_dy = (uv_dy >> 3) + roundtab_76[uv_dy & 0xf]; |