41 |
* * |
* * |
42 |
* Revision history: * |
* Revision history: * |
43 |
* * |
* * |
44 |
|
* 28.06.2002 added check_resync_marker() * |
45 |
* 14.04.2002 bframe encoding * |
* 14.04.2002 bframe encoding * |
46 |
* 08.03.2002 initial version; isibaar * |
* 08.03.2002 initial version; isibaar * |
47 |
* * |
* * |
518 |
int i; |
int i; |
519 |
|
|
520 |
/* ------------------------------------------------------------------ |
/* ------------------------------------------------------------------ |
521 |
when a block is skipped it is decoded DIRECT(0,) |
when a block is skipped it is decoded DIRECT(0,0) |
522 |
hence are interpolated from forward & backward frames |
hence is interpolated from forward & backward frames |
523 |
------------------------------------------------------------------ */ |
------------------------------------------------------------------ */ |
524 |
|
|
525 |
if (mb->mode == 5) { |
if (mb->mode == MODE_DIRECT_NONE_MV) { |
526 |
BitstreamPutBit(bs, 1); // skipped |
BitstreamPutBit(bs, 1); // skipped |
527 |
return; |
return; |
528 |
} |
} |
556 |
} |
} |
557 |
|
|
558 |
if (mb->mode == MODE_DIRECT) { |
if (mb->mode == MODE_DIRECT) { |
559 |
// TODO: direct |
CodeVector(bs, mb->mvs[0].x, 1, pStat); /* fcode is always 1 for delta vector */ |
560 |
|
CodeVector(bs, mb->mvs[0].y, 1, pStat); /* prediction is always (0,0) */ |
561 |
} |
} |
562 |
|
|
563 |
for (i = 0; i < 6; i++) { |
for (i = 0; i < 6; i++) { |
573 |
* decoding stuff starts here * |
* decoding stuff starts here * |
574 |
***************************************************************/ |
***************************************************************/ |
575 |
|
|
576 |
|
|
577 |
|
// for IVOP addbits == 0 |
578 |
|
// for PVOP addbits == fcode - 1 |
579 |
|
// for BVOP addbits == max(fcode,bcode) - 1 |
580 |
|
// returns true or false |
581 |
|
int |
582 |
|
check_resync_marker(Bitstream * bs, int addbits) |
583 |
|
{ |
584 |
|
uint32_t nbits; |
585 |
|
uint32_t code; |
586 |
|
uint32_t nbitsresyncmarker = NUMBITS_VP_RESYNC_MARKER + addbits; |
587 |
|
|
588 |
|
nbits = BitstreamNumBitsToByteAlign(bs); |
589 |
|
code = BitstreamShowBits(bs, nbits); |
590 |
|
|
591 |
|
if (code == (((uint32_t)1 << (nbits - 1)) - 1)) |
592 |
|
{ |
593 |
|
return BitstreamShowBitsFromByteAlign(bs, nbitsresyncmarker) == RESYNC_MARKER; |
594 |
|
} |
595 |
|
|
596 |
|
return 0; |
597 |
|
} |
598 |
|
|
599 |
|
|
600 |
|
|
601 |
int |
int |
602 |
get_mcbpc_intra(Bitstream * bs) |
get_mcbpc_intra(Bitstream * bs) |
603 |
{ |
{ |
604 |
|
|
605 |
uint32_t index; |
uint32_t index; |
606 |
|
|
607 |
while ((index = BitstreamShowBits(bs, 9)) == 1) |
index = BitstreamShowBits(bs, 9); |
|
BitstreamSkip(bs, 9); |
|
|
|
|
608 |
index >>= 3; |
index >>= 3; |
609 |
|
|
610 |
BitstreamSkip(bs, mcbpc_intra_table[index].len); |
BitstreamSkip(bs, mcbpc_intra_table[index].len); |
619 |
|
|
620 |
uint32_t index; |
uint32_t index; |
621 |
|
|
622 |
while ((index = CLIP(BitstreamShowBits(bs, 9), 256)) == 1) |
index = CLIP(BitstreamShowBits(bs, 9), 256); |
|
BitstreamSkip(bs, 9); |
|
623 |
|
|
624 |
BitstreamSkip(bs, mcbpc_inter_table[index].len); |
BitstreamSkip(bs, mcbpc_inter_table[index].len); |
625 |
|
|
774 |
} |
} |
775 |
coeff += run; |
coeff += run; |
776 |
block[scan[coeff]] = level; |
block[scan[coeff]] = level; |
777 |
|
|
778 |
|
DPRINTF(DPRINTF_COEFF,"block[%i] %i", scan[coeff], level); |
779 |
|
//DPRINTF(DPRINTF_COEFF,"block[%i] %i %08x", scan[coeff], level, BitstreamShowBits(bs, 32)); |
780 |
|
|
781 |
if (level < -127 || level > 127) { |
if (level < -127 || level > 127) { |
782 |
DEBUG1("warning: intra_overflow", level); |
DEBUG1("warning: intra_overflow", level); |
783 |
} |
} |
807 |
p += run; |
p += run; |
808 |
|
|
809 |
block[scan[p]] = level; |
block[scan[p]] = level; |
810 |
|
|
811 |
|
DPRINTF(DPRINTF_COEFF,"block[%i] %i", scan[p], level); |
812 |
|
// DPRINTF(DPRINTF_COEFF,"block[%i] %i %08x", scan[p], level, BitstreamShowBits(bs, 32)); |
813 |
|
|
814 |
if (level < -127 || level > 127) { |
if (level < -127 || level > 127) { |
815 |
DEBUG1("warning: inter_overflow", level); |
DEBUG1("warning: inter_overflow", level); |
816 |
} |
} |