115 |
returns coding_type, or -1 if error |
returns coding_type, or -1 if error |
116 |
*/ |
*/ |
117 |
|
|
118 |
int BitstreamReadHeaders(Bitstream * bs, DECODER * dec, uint32_t * rounding, uint32_t * quant, uint32_t * fcode, uint32_t * intra_dc_threshold) |
int BitstreamReadHeaders(Bitstream * bs, DECODER * dec, uint32_t * rounding, uint32_t * quant, uint32_t * fcode_forward, uint32_t * fcode_backward, uint32_t * intra_dc_threshold) |
119 |
{ |
{ |
120 |
uint32_t vol_ver_id; |
uint32_t vol_ver_id; |
121 |
uint32_t time_inc_resolution; |
static uint32_t time_increment_resolution; |
122 |
uint32_t coding_type; |
uint32_t coding_type; |
123 |
uint32_t start_code; |
uint32_t start_code; |
124 |
|
uint32_t time_incr=0; |
125 |
|
int32_t time_increment; |
126 |
|
|
127 |
do |
do |
128 |
{ |
{ |
251 |
|
|
252 |
READ_MARKER(); |
READ_MARKER(); |
253 |
|
|
254 |
time_inc_resolution = BitstreamGetBits(bs, 16); // vop_time_increment_resolution |
// *************************** for decode B-frame time *********************** |
255 |
time_inc_resolution--; |
time_increment_resolution = BitstreamGetBits(bs, 16); // vop_time_increment_resolution |
256 |
if (time_inc_resolution > 0) |
time_increment_resolution--; |
257 |
|
//DEBUG1("time_increment_resolution=",time_increment_resolution); |
258 |
|
if (time_increment_resolution > 0) |
259 |
{ |
{ |
260 |
dec->time_inc_bits = log2bin(time_inc_resolution); |
dec->time_inc_bits = log2bin(time_increment_resolution); |
261 |
} |
} |
262 |
else |
else |
263 |
{ |
{ |
421 |
} |
} |
422 |
} |
} |
423 |
|
|
424 |
if (BitstreamGetBit(bs)) // scalability |
if ((dec->scalability=BitstreamGetBit(bs))) // scalability |
425 |
{ |
{ |
426 |
// TODO |
// TODO |
427 |
DEBUG("TODO: scalability"); |
DEBUG("TODO: scalability"); |
467 |
coding_type = BitstreamGetBits(bs, 2); // vop_coding_type |
coding_type = BitstreamGetBits(bs, 2); // vop_coding_type |
468 |
//DEBUG1("coding_type", coding_type); |
//DEBUG1("coding_type", coding_type); |
469 |
|
|
470 |
while (BitstreamGetBit(bs) != 0) ; // time_base |
// *************************** for decode B-frame time *********************** |
471 |
|
while (BitstreamGetBit(bs) != 0) // time_base |
472 |
|
time_incr++; |
473 |
|
|
474 |
READ_MARKER(); |
READ_MARKER(); |
475 |
|
|
477 |
//DEBUG1("vop_time_incr", BitstreamShowBits(bs, dec->time_inc_bits)); |
//DEBUG1("vop_time_incr", BitstreamShowBits(bs, dec->time_inc_bits)); |
478 |
if (dec->time_inc_bits) |
if (dec->time_inc_bits) |
479 |
{ |
{ |
480 |
BitstreamSkip(bs, dec->time_inc_bits); // vop_time_increment |
//BitstreamSkip(bs, dec->time_inc_bits); // vop_time_increment |
481 |
|
time_increment = (BitstreamGetBits(bs, dec->time_inc_bits)); // vop_time_increment |
482 |
|
} |
483 |
|
if(coding_type != B_VOP){ |
484 |
|
dec->last_time_base = dec->time_base; |
485 |
|
dec->time_base += time_incr; |
486 |
|
dec->time = dec->time_base*time_increment_resolution + time_increment; |
487 |
|
dec->time_pp= (uint32_t)(dec->time - dec->last_non_b_time); |
488 |
|
dec->last_non_b_time= dec->time; |
489 |
|
}else{ |
490 |
|
dec->time = (dec->last_time_base + time_incr)*time_increment_resolution + time_increment; |
491 |
|
dec->time_bp= (uint32_t)(dec->last_non_b_time - dec->time); |
492 |
} |
} |
493 |
|
//DEBUG1("time_increment=",time_increment); |
494 |
|
|
495 |
READ_MARKER(); |
READ_MARKER(); |
496 |
|
|
504 |
} |
} |
505 |
*/ |
*/ |
506 |
|
|
507 |
if (coding_type != I_VOP) |
// fix a little bug by MinChen <chenm002@163.com> |
508 |
|
if ((dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) && (coding_type == P_VOP)) |
509 |
{ |
{ |
510 |
*rounding = BitstreamGetBit(bs); // rounding_type |
*rounding = BitstreamGetBit(bs); // rounding_type |
511 |
//DEBUG1("rounding", *rounding); |
//DEBUG1("rounding", *rounding); |
564 |
|
|
565 |
if (coding_type != I_VOP) |
if (coding_type != I_VOP) |
566 |
{ |
{ |
567 |
*fcode = BitstreamGetBits(bs, 3); // fcode_forward |
*fcode_forward = BitstreamGetBits(bs, 3); // fcode_forward |
568 |
} |
} |
569 |
|
|
570 |
if (coding_type == B_VOP) |
if (coding_type == B_VOP) |
571 |
{ |
{ |
572 |
// *fcode_backward = BitstreamGetBits(bs, 3); // fcode_backward |
*fcode_backward = BitstreamGetBits(bs, 3); // fcode_backward |
573 |
|
} |
574 |
|
if (!dec->scalability){ |
575 |
|
if ((dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) && (coding_type != I_VOP)){ |
576 |
|
BitstreamSkip(bs, 1); // vop_shape_coding_type |
577 |
|
} |
578 |
} |
} |
579 |
return coding_type; |
return coding_type; |
580 |
} |
} |