153
INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
154
ff_mpeg12_vlc_dc_lum_bits, 1, 1,
155
ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
156
INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
157
ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
158
ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
159
INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
160
&ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
161
&ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
162
INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
163
&ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
164
&ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
165
INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
166
&ff_mpeg12_mbPatTable[0][1], 2, 1,
167
&ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
151
INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
152
ff_mpeg12_vlc_dc_lum_bits, 1, 1,
153
ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
154
INIT_VLC_STATIC(&ff_dc_chroma_vlc, DC_VLC_BITS, 12,
155
ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
156
ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
157
INIT_VLC_STATIC(&ff_mv_vlc, MV_VLC_BITS, 17,
158
&ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
159
&ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
160
INIT_VLC_STATIC(&ff_mbincr_vlc, MBINCR_VLC_BITS, 36,
161
&ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
162
&ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
163
INIT_VLC_STATIC(&ff_mb_pat_vlc, MB_PAT_VLC_BITS, 64,
164
&ff_mpeg12_mbPatTable[0][1], 2, 1,
165
&ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
169
INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
170
&table_mb_ptype[0][1], 2, 1,
171
&table_mb_ptype[0][0], 2, 1, 64);
172
INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
173
&table_mb_btype[0][1], 2, 1,
174
&table_mb_btype[0][0], 2, 1, 64);
175
init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
176
init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
167
INIT_VLC_STATIC(&ff_mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
168
&table_mb_ptype[0][1], 2, 1,
169
&table_mb_ptype[0][0], 2, 1, 64);
170
INIT_VLC_STATIC(&ff_mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
171
&table_mb_btype[0][1], 2, 1,
172
&table_mb_btype[0][0], 2, 1, 64);
173
ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
174
ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
178
176
INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
179
177
INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
183
static inline int get_dmv(MpegEncContext *s)
185
if(get_bits1(&s->gb))
186
return 1 - (get_bits1(&s->gb) << 1);
191
static inline int get_qscale(MpegEncContext *s)
193
int qscale = get_bits(&s->gb, 5);
194
if (s->q_scale_type) {
195
return non_linear_qscale[qscale];
201
/* motion type (for MPEG-2) */
207
static int mpeg_decode_mb(MpegEncContext *s,
208
DCTELEM block[12][64])
210
int i, j, k, cbp, val, mb_type, motion_type;
211
const int mb_block_count = 4 + (1<< s->chroma_format);
213
dprintf(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
215
assert(s->mb_skipped==0);
217
if (s->mb_skip_run-- != 0) {
218
if (s->pict_type == FF_P_TYPE) {
220
s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
225
mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1];
227
mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
228
if(IS_INTRA(mb_type))
231
s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
232
mb_type | MB_TYPE_SKIP;
233
// assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
235
if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
242
switch(s->pict_type) {
245
if (get_bits1(&s->gb) == 0) {
246
if (get_bits1(&s->gb) == 0){
247
av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y);
250
mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
252
mb_type = MB_TYPE_INTRA;
256
mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
258
av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
261
mb_type = ptype2mb_type[ mb_type ];
264
mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
266
av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
269
mb_type = btype2mb_type[ mb_type ];
272
dprintf(s->avctx, "mb_type=%x\n", mb_type);
273
// motion_type = 0; /* avoid warning */
274
if (IS_INTRA(mb_type)) {
275
s->dsp.clear_blocks(s->block[0]);
277
if(!s->chroma_y_shift){
278
s->dsp.clear_blocks(s->block[6]);
281
/* compute DCT type */
282
if (s->picture_structure == PICT_FRAME && //FIXME add an interlaced_dct coded var?
283
!s->frame_pred_frame_dct) {
284
s->interlaced_dct = get_bits1(&s->gb);
287
if (IS_QUANT(mb_type))
288
s->qscale = get_qscale(s);
290
if (s->concealment_motion_vectors) {
291
/* just parse them */
292
if (s->picture_structure != PICT_FRAME)
293
skip_bits1(&s->gb); /* field select */
295
s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] =
296
mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]);
297
s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] =
298
mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]);
300
skip_bits1(&s->gb); /* marker */
302
memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
304
//if 1, we memcpy blocks in xvmcvideo
305
if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
306
ff_xvmc_pack_pblocks(s,-1);//inter are always full blocks
312
if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
313
if(s->flags2 & CODEC_FLAG2_FAST){
315
mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
318
for(i=0;i<mb_block_count;i++) {
319
if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
325
if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
330
if (mb_type & MB_TYPE_ZERO_MV){
331
assert(mb_type & MB_TYPE_CBP);
333
s->mv_dir = MV_DIR_FORWARD;
334
if(s->picture_structure == PICT_FRAME){
335
if(!s->frame_pred_frame_dct)
336
s->interlaced_dct = get_bits1(&s->gb);
337
s->mv_type = MV_TYPE_16X16;
339
s->mv_type = MV_TYPE_FIELD;
340
mb_type |= MB_TYPE_INTERLACED;
341
s->field_select[0][0]= s->picture_structure - 1;
344
if (IS_QUANT(mb_type))
345
s->qscale = get_qscale(s);
347
s->last_mv[0][0][0] = 0;
348
s->last_mv[0][0][1] = 0;
349
s->last_mv[0][1][0] = 0;
350
s->last_mv[0][1][1] = 0;
354
assert(mb_type & MB_TYPE_L0L1);
355
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
356
/* get additional motion vector type */
357
if (s->frame_pred_frame_dct)
358
motion_type = MT_FRAME;
360
motion_type = get_bits(&s->gb, 2);
361
if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
362
s->interlaced_dct = get_bits1(&s->gb);
365
if (IS_QUANT(mb_type))
366
s->qscale = get_qscale(s);
369
s->mv_dir= (mb_type>>13)&3;
370
dprintf(s->avctx, "motion_type=%d\n", motion_type);
371
switch(motion_type) {
372
case MT_FRAME: /* or MT_16X8 */
373
if (s->picture_structure == PICT_FRAME) {
374
mb_type |= MB_TYPE_16x16;
375
s->mv_type = MV_TYPE_16X16;
377
if (USES_LIST(mb_type, i)) {
379
s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
380
mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
381
s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
382
mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
383
/* full_pel: only for MPEG-1 */
385
s->mv[i][0][0] <<= 1;
386
s->mv[i][0][1] <<= 1;
391
mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
392
s->mv_type = MV_TYPE_16X8;
394
if (USES_LIST(mb_type, i)) {
397
s->field_select[i][j] = get_bits1(&s->gb);
399
val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
400
s->last_mv[i][j][k]);
401
s->last_mv[i][j][k] = val;
402
s->mv[i][j][k] = val;
410
s->mv_type = MV_TYPE_FIELD;
411
if (s->picture_structure == PICT_FRAME) {
412
mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
414
if (USES_LIST(mb_type, i)) {
416
s->field_select[i][j] = get_bits1(&s->gb);
417
val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
418
s->last_mv[i][j][0]);
419
s->last_mv[i][j][0] = val;
420
s->mv[i][j][0] = val;
421
dprintf(s->avctx, "fmx=%d\n", val);
422
val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
423
s->last_mv[i][j][1] >> 1);
424
s->last_mv[i][j][1] = val << 1;
425
s->mv[i][j][1] = val;
426
dprintf(s->avctx, "fmy=%d\n", val);
431
mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
433
if (USES_LIST(mb_type, i)) {
434
s->field_select[i][0] = get_bits1(&s->gb);
436
val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
437
s->last_mv[i][0][k]);
438
s->last_mv[i][0][k] = val;
439
s->last_mv[i][1][k] = val;
440
s->mv[i][0][k] = val;
447
s->mv_type = MV_TYPE_DMV;
449
if (USES_LIST(mb_type, i)) {
450
int dmx, dmy, mx, my, m;
451
const int my_shift= s->picture_structure == PICT_FRAME;
453
mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
454
s->last_mv[i][0][0]);
455
s->last_mv[i][0][0] = mx;
456
s->last_mv[i][1][0] = mx;
458
my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
459
s->last_mv[i][0][1] >> my_shift);
463
s->last_mv[i][0][1] = my<<my_shift;
464
s->last_mv[i][1][1] = my<<my_shift;
468
s->mv[i][1][0] = mx;//not used
469
s->mv[i][1][1] = my;//not used
471
if (s->picture_structure == PICT_FRAME) {
472
mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
474
//m = 1 + 2 * s->top_field_first;
475
m = s->top_field_first ? 1 : 3;
477
/* top -> top pred */
478
s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
479
s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
481
s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
482
s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
484
mb_type |= MB_TYPE_16x16;
486
s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
487
s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
488
if(s->picture_structure == PICT_TOP_FIELD)
497
av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y);
503
if (HAS_CBP(mb_type)) {
504
s->dsp.clear_blocks(s->block[0]);
506
cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
507
if(mb_block_count > 6){
508
cbp<<= mb_block_count-6;
509
cbp |= get_bits(&s->gb, mb_block_count-6);
510
s->dsp.clear_blocks(s->block[6]);
513
av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
517
//if 1, we memcpy blocks in xvmcvideo
518
if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1){
519
ff_xvmc_pack_pblocks(s,cbp);
525
if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
526
if(s->flags2 & CODEC_FLAG2_FAST){
529
mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
531
s->block_last_index[i] = -1;
536
cbp<<= 12-mb_block_count;
538
for(i=0;i<mb_block_count;i++) {
539
if ( cbp & (1<<11) ) {
540
if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
543
s->block_last_index[i] = -1;
549
if(s->flags2 & CODEC_FLAG2_FAST){
552
mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
554
s->block_last_index[i] = -1;
561
if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
564
s->block_last_index[i] = -1;
572
s->block_last_index[i] = -1;
576
s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
581
/* as H.263, but only 17 codes */
582
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
584
int code, sign, val, l, shift;
586
code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
594
sign = get_bits1(&s->gb);
598
val = (val - 1) << shift;
599
val |= get_bits(&s->gb, shift);
606
/* modulo decoding */
607
l= INT_BIT - 5 - shift;
612
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
616
int level, dc, diff, i, j, run;
618
RLTable *rl = &ff_rl_mpeg1;
619
uint8_t * const scantable= s->intra_scantable.permutated;
620
const uint16_t *quant_matrix= s->intra_matrix;
621
const int qscale= s->qscale;
624
component = (n <= 3 ? 0 : n - 4 + 1);
625
diff = decode_dc(&s->gb, component);
628
dc = s->last_dc[component];
630
s->last_dc[component] = dc;
631
block[0] = dc*quant_matrix[0];
632
dprintf(s->avctx, "dc=%d diff=%d\n", dc, diff);
635
OPEN_READER(re, &s->gb);
636
/* now quantify & encode AC coefficients */
638
UPDATE_CACHE(re, &s->gb);
639
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
643
} else if(level != 0) {
646
level= (level*qscale*quant_matrix[j])>>4;
648
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
649
LAST_SKIP_BITS(re, &s->gb, 1);
652
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
653
UPDATE_CACHE(re, &s->gb);
654
level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
656
level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
657
} else if (level == 0) {
658
level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
664
level= (level*qscale*quant_matrix[j])>>4;
668
level= (level*qscale*quant_matrix[j])>>4;
673
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
679
CLOSE_READER(re, &s->gb);
681
s->block_last_index[n] = i;
685
int ff_mpeg1_decode_block_intra(MpegEncContext *s,
689
return mpeg1_decode_block_intra(s, block, n);
692
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
696
int level, i, j, run;
697
RLTable *rl = &ff_rl_mpeg1;
698
uint8_t * const scantable= s->intra_scantable.permutated;
699
const uint16_t *quant_matrix= s->inter_matrix;
700
const int qscale= s->qscale;
703
OPEN_READER(re, &s->gb);
705
// special case for first coefficient, no need to add second VLC table
706
UPDATE_CACHE(re, &s->gb);
707
if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
708
level= (3*qscale*quant_matrix[0])>>5;
710
if(GET_CACHE(re, &s->gb)&0x40000000)
714
SKIP_BITS(re, &s->gb, 2);
715
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
718
#if MIN_CACHE_BITS < 19
719
UPDATE_CACHE(re, &s->gb);
721
/* now quantify & encode AC coefficients */
723
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
728
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
730
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
731
SKIP_BITS(re, &s->gb, 1);
734
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
735
UPDATE_CACHE(re, &s->gb);
736
level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
738
level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
739
} else if (level == 0) {
740
level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
746
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
750
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
755
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
760
#if MIN_CACHE_BITS < 19
761
UPDATE_CACHE(re, &s->gb);
763
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
765
#if MIN_CACHE_BITS >= 19
766
UPDATE_CACHE(re, &s->gb);
770
LAST_SKIP_BITS(re, &s->gb, 2);
771
CLOSE_READER(re, &s->gb);
773
s->block_last_index[n] = i;
777
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n)
779
int level, i, j, run;
780
RLTable *rl = &ff_rl_mpeg1;
781
uint8_t * const scantable= s->intra_scantable.permutated;
782
const int qscale= s->qscale;
785
OPEN_READER(re, &s->gb);
787
// special case for first coefficient, no need to add second VLC table
788
UPDATE_CACHE(re, &s->gb);
789
if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
790
level= (3*qscale)>>1;
792
if(GET_CACHE(re, &s->gb)&0x40000000)
796
SKIP_BITS(re, &s->gb, 2);
797
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
800
#if MIN_CACHE_BITS < 19
801
UPDATE_CACHE(re, &s->gb);
804
/* now quantify & encode AC coefficients */
806
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
811
level= ((level*2+1)*qscale)>>1;
813
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
814
SKIP_BITS(re, &s->gb, 1);
817
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
818
UPDATE_CACHE(re, &s->gb);
819
level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
821
level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
822
} else if (level == 0) {
823
level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
829
level= ((level*2+1)*qscale)>>1;
833
level= ((level*2+1)*qscale)>>1;
839
#if MIN_CACHE_BITS < 19
840
UPDATE_CACHE(re, &s->gb);
842
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
844
#if MIN_CACHE_BITS >= 19
845
UPDATE_CACHE(re, &s->gb);
849
LAST_SKIP_BITS(re, &s->gb, 2);
850
CLOSE_READER(re, &s->gb);
852
s->block_last_index[n] = i;
857
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
861
int level, i, j, run;
862
RLTable *rl = &ff_rl_mpeg1;
863
uint8_t * const scantable= s->intra_scantable.permutated;
864
const uint16_t *quant_matrix;
865
const int qscale= s->qscale;
871
OPEN_READER(re, &s->gb);
874
quant_matrix = s->inter_matrix;
876
quant_matrix = s->chroma_inter_matrix;
878
// special case for first coefficient, no need to add second VLC table
879
UPDATE_CACHE(re, &s->gb);
880
if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
881
level= (3*qscale*quant_matrix[0])>>5;
882
if(GET_CACHE(re, &s->gb)&0x40000000)
887
SKIP_BITS(re, &s->gb, 2);
888
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
891
#if MIN_CACHE_BITS < 19
892
UPDATE_CACHE(re, &s->gb);
895
/* now quantify & encode AC coefficients */
897
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
902
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
903
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
904
SKIP_BITS(re, &s->gb, 1);
907
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
908
UPDATE_CACHE(re, &s->gb);
909
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
914
level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
917
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
921
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
927
#if MIN_CACHE_BITS < 19
928
UPDATE_CACHE(re, &s->gb);
930
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
932
#if MIN_CACHE_BITS >= 19
933
UPDATE_CACHE(re, &s->gb);
937
LAST_SKIP_BITS(re, &s->gb, 2);
938
CLOSE_READER(re, &s->gb);
940
block[63] ^= (mismatch & 1);
942
s->block_last_index[n] = i;
946
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
950
int level, i, j, run;
951
RLTable *rl = &ff_rl_mpeg1;
952
uint8_t * const scantable= s->intra_scantable.permutated;
953
const int qscale= s->qscale;
954
OPEN_READER(re, &s->gb);
957
// special case for first coefficient, no need to add second VLC table
958
UPDATE_CACHE(re, &s->gb);
959
if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {
960
level= (3*qscale)>>1;
961
if(GET_CACHE(re, &s->gb)&0x40000000)
965
SKIP_BITS(re, &s->gb, 2);
966
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
969
#if MIN_CACHE_BITS < 19
970
UPDATE_CACHE(re, &s->gb);
973
/* now quantify & encode AC coefficients */
975
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
980
level= ((level*2+1)*qscale)>>1;
981
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
982
SKIP_BITS(re, &s->gb, 1);
985
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
986
UPDATE_CACHE(re, &s->gb);
987
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
992
level= ((-level*2+1)*qscale)>>1;
995
level= ((level*2+1)*qscale)>>1;
1000
#if MIN_CACHE_BITS < 19
1001
UPDATE_CACHE(re, &s->gb);
1003
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
1005
#if MIN_CACHE_BITS >=19
1006
UPDATE_CACHE(re, &s->gb);
1010
LAST_SKIP_BITS(re, &s->gb, 2);
1011
CLOSE_READER(re, &s->gb);
1012
s->block_last_index[n] = i;
1017
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
1021
int level, dc, diff, i, j, run;
1024
uint8_t * const scantable= s->intra_scantable.permutated;
1025
const uint16_t *quant_matrix;
1026
const int qscale= s->qscale;
1029
/* DC coefficient */
1031
quant_matrix = s->intra_matrix;
1034
quant_matrix = s->chroma_intra_matrix;
1035
component = (n&1) + 1;
1037
diff = decode_dc(&s->gb, component);
1040
dc = s->last_dc[component];
1042
s->last_dc[component] = dc;
1043
block[0] = dc << (3 - s->intra_dc_precision);
1044
dprintf(s->avctx, "dc=%d\n", block[0]);
1045
mismatch = block[0] ^ 1;
1047
if (s->intra_vlc_format)
1053
OPEN_READER(re, &s->gb);
1054
/* now quantify & encode AC coefficients */
1056
UPDATE_CACHE(re, &s->gb);
1057
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1061
} else if(level != 0) {
1064
level= (level*qscale*quant_matrix[j])>>4;
1065
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1066
LAST_SKIP_BITS(re, &s->gb, 1);
1069
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1070
UPDATE_CACHE(re, &s->gb);
1071
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1075
level= (-level*qscale*quant_matrix[j])>>4;
1078
level= (level*qscale*quant_matrix[j])>>4;
1082
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
1089
CLOSE_READER(re, &s->gb);
1091
block[63]^= mismatch&1;
1093
s->block_last_index[n] = i;
1097
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
1101
int level, dc, diff, j, run;
1104
uint8_t * scantable= s->intra_scantable.permutated;
1105
const uint16_t *quant_matrix;
1106
const int qscale= s->qscale;
1108
/* DC coefficient */
1110
quant_matrix = s->intra_matrix;
1113
quant_matrix = s->chroma_intra_matrix;
1114
component = (n&1) + 1;
1116
diff = decode_dc(&s->gb, component);
1119
dc = s->last_dc[component];
1121
s->last_dc[component] = dc;
1122
block[0] = dc << (3 - s->intra_dc_precision);
1123
if (s->intra_vlc_format)
1129
OPEN_READER(re, &s->gb);
1130
/* now quantify & encode AC coefficients */
1132
UPDATE_CACHE(re, &s->gb);
1133
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
1137
} else if(level != 0) {
1140
level= (level*qscale*quant_matrix[j])>>4;
1141
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
1142
LAST_SKIP_BITS(re, &s->gb, 1);
1145
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
1146
UPDATE_CACHE(re, &s->gb);
1147
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
1151
level= (-level*qscale*quant_matrix[j])>>4;
1154
level= (level*qscale*quant_matrix[j])>>4;
1160
CLOSE_READER(re, &s->gb);
1163
s->block_last_index[n] = scantable - s->intra_scantable.permutated;
1167
typedef struct Mpeg1Context {
1168
MpegEncContext mpeg_enc_ctx;
1169
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
1170
int repeat_field; /* true if we must repeat the field */
1171
AVPanScan pan_scan; /** some temporary storage for the panscan */
1173
int swap_uv;//indicate VCR2
1174
int save_aspect_info;
1175
int save_width, save_height, save_progressive_seq;
1176
AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
1177
int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
1180
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
1182
Mpeg1Context *s = avctx->priv_data;
1183
MpegEncContext *s2 = &s->mpeg_enc_ctx;
1186
/* we need some permutation to store matrices,
1187
* until MPV_common_init() sets the real permutation. */
1189
s2->dsp.idct_permutation[i]=i;
1191
MPV_decode_defaults(s2);
1193
s->mpeg_enc_ctx.avctx= avctx;
1194
s->mpeg_enc_ctx.flags= avctx->flags;
1195
s->mpeg_enc_ctx.flags2= avctx->flags2;
1196
ff_mpeg12_common_init(&s->mpeg_enc_ctx);
1197
ff_mpeg12_init_vlcs();
1199
s->mpeg_enc_ctx_allocated = 0;
1200
s->mpeg_enc_ctx.picture_number = 0;
1201
s->repeat_field = 0;
1202
s->mpeg_enc_ctx.codec_id= avctx->codec->id;
1203
avctx->color_range= AVCOL_RANGE_MPEG;
1204
if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
1205
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1207
avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
1211
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
1212
const uint8_t *new_perm){
1213
uint16_t temp_matrix[64];
1216
memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
1219
matrix[new_perm[i]] = temp_matrix[old_perm[i]];
1223
static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
1224
Mpeg1Context *s1 = avctx->priv_data;
1225
MpegEncContext *s = &s1->mpeg_enc_ctx;
1227
if(avctx->xvmc_acceleration)
1228
return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
1229
else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
1230
if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
1231
return PIX_FMT_VDPAU_MPEG1;
1233
return PIX_FMT_VDPAU_MPEG2;
1235
if(s->chroma_format < 2)
1236
return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
1237
else if(s->chroma_format == 2)
1238
return PIX_FMT_YUV422P;
1240
return PIX_FMT_YUV444P;
1244
/* Call this function when we know all parameters.
1245
* It may be called in different places for MPEG-1 and MPEG-2. */
1246
static int mpeg_decode_postinit(AVCodecContext *avctx){
1247
Mpeg1Context *s1 = avctx->priv_data;
1248
MpegEncContext *s = &s1->mpeg_enc_ctx;
1249
uint8_t old_permutation[64];
1252
(s1->mpeg_enc_ctx_allocated == 0)||
1253
avctx->coded_width != s->width ||
1254
avctx->coded_height != s->height||
1255
s1->save_width != s->width ||
1256
s1->save_height != s->height ||
1257
s1->save_aspect_info != s->aspect_ratio_info||
1258
s1->save_progressive_seq != s->progressive_sequence ||
1262
if (s1->mpeg_enc_ctx_allocated) {
1263
ParseContext pc= s->parse_context;
1264
s->parse_context.buffer=0;
1266
s->parse_context= pc;
1269
if( (s->width == 0 )||(s->height == 0))
1272
avcodec_set_dimensions(avctx, s->width, s->height);
1273
avctx->bit_rate = s->bit_rate;
1274
s1->save_aspect_info = s->aspect_ratio_info;
1275
s1->save_width = s->width;
1276
s1->save_height = s->height;
1277
s1->save_progressive_seq = s->progressive_sequence;
1279
/* low_delay may be forced, in this case we will have B-frames
1280
* that behave like P-frames. */
1281
avctx->has_b_frames = !(s->low_delay);
1283
assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
1284
if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
1286
avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
1287
avctx->time_base.num= ff_frame_rate_tab[s->frame_rate_index].den;
1289
avctx->sample_aspect_ratio= av_d2q(
1290
1.0/ff_mpeg1_aspect[s->aspect_ratio_info], 255);
1291
avctx->ticks_per_frame=1;
1295
&s->avctx->time_base.den,
1296
&s->avctx->time_base.num,
1297
ff_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
1298
ff_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1300
avctx->ticks_per_frame=2;
1302
if(s->aspect_ratio_info > 1){
1303
//we ignore the spec here as reality does not match the spec, see for example
1304
// res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
1305
if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
1306
s->avctx->sample_aspect_ratio=
1308
ff_mpeg2_aspect[s->aspect_ratio_info],
1309
(AVRational){s->width, s->height}
1312
s->avctx->sample_aspect_ratio=
1314
ff_mpeg2_aspect[s->aspect_ratio_info],
1315
(AVRational){s1->pan_scan.width, s1->pan_scan.height}
1319
s->avctx->sample_aspect_ratio=
1320
ff_mpeg2_aspect[s->aspect_ratio_info];
1324
avctx->pix_fmt = mpeg_get_pixelformat(avctx);
1325
avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
1326
//until then pix_fmt may be changed right after codec init
1327
if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
1329
s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
1330
if( avctx->idct_algo == FF_IDCT_AUTO )
1331
avctx->idct_algo = FF_IDCT_SIMPLE;
1333
/* Quantization matrices may need reordering
1334
* if DCT permutation is changed. */
1335
memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
1337
if (MPV_common_init(s) < 0)
1340
quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation);
1341
quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation);
1342
quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation);
1343
quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation);
1345
s1->mpeg_enc_ctx_allocated = 1;
1350
static int mpeg1_decode_picture(AVCodecContext *avctx,
1351
const uint8_t *buf, int buf_size)
1353
Mpeg1Context *s1 = avctx->priv_data;
1354
MpegEncContext *s = &s1->mpeg_enc_ctx;
1355
int ref, f_code, vbv_delay;
1357
init_get_bits(&s->gb, buf, buf_size*8);
1359
ref = get_bits(&s->gb, 10); /* temporal ref */
1360
s->pict_type = get_bits(&s->gb, 3);
1361
if(s->pict_type == 0 || s->pict_type > 3)
1364
vbv_delay= get_bits(&s->gb, 16);
1365
if (s->pict_type == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
1366
s->full_pel[0] = get_bits1(&s->gb);
1367
f_code = get_bits(&s->gb, 3);
1368
if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1370
s->mpeg_f_code[0][0] = f_code;
1371
s->mpeg_f_code[0][1] = f_code;
1373
if (s->pict_type == FF_B_TYPE) {
1374
s->full_pel[1] = get_bits1(&s->gb);
1375
f_code = get_bits(&s->gb, 3);
1376
if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
1378
s->mpeg_f_code[1][0] = f_code;
1379
s->mpeg_f_code[1][1] = f_code;
1381
s->current_picture.pict_type= s->pict_type;
1382
s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1384
if(avctx->debug & FF_DEBUG_PICT_INFO)
1385
av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
1392
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
1394
MpegEncContext *s= &s1->mpeg_enc_ctx;
1395
int horiz_size_ext, vert_size_ext;
1398
skip_bits(&s->gb, 1); /* profile and level esc*/
1399
s->avctx->profile= get_bits(&s->gb, 3);
1400
s->avctx->level= get_bits(&s->gb, 4);
1401
s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
1402
s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
1403
horiz_size_ext = get_bits(&s->gb, 2);
1404
vert_size_ext = get_bits(&s->gb, 2);
1405
s->width |= (horiz_size_ext << 12);
1406
s->height |= (vert_size_ext << 12);
1407
bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
1408
s->bit_rate += (bit_rate_ext << 18) * 400;
1409
skip_bits1(&s->gb); /* marker */
1410
s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10;
1412
s->low_delay = get_bits1(&s->gb);
1413
if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
1415
s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1;
1416
s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1;
1418
dprintf(s->avctx, "sequence extension\n");
1419
s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
1420
s->avctx->sub_id = 2; /* indicates MPEG-2 found */
1422
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1423
av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
1424
s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate);
1428
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
1430
MpegEncContext *s= &s1->mpeg_enc_ctx;
1431
int color_description, w, h;
1433
skip_bits(&s->gb, 3); /* video format */
1434
color_description= get_bits1(&s->gb);
1435
if(color_description){
1436
s->avctx->color_primaries= get_bits(&s->gb, 8);
1437
s->avctx->color_trc = get_bits(&s->gb, 8);
1438
s->avctx->colorspace = get_bits(&s->gb, 8);
1440
w= get_bits(&s->gb, 14);
1441
skip_bits(&s->gb, 1); //marker
1442
h= get_bits(&s->gb, 14);
1443
skip_bits(&s->gb, 1); //marker
1445
s1->pan_scan.width= 16*w;
1446
s1->pan_scan.height=16*h;
1448
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1449
av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
1452
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
1454
MpegEncContext *s= &s1->mpeg_enc_ctx;
1458
if(s->progressive_sequence){
1459
if(s->repeat_first_field){
1461
if(s->top_field_first)
1465
if(s->picture_structure == PICT_FRAME){
1467
if(s->repeat_first_field)
1471
for(i=0; i<nofco; i++){
1472
s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
1473
skip_bits(&s->gb, 1); //marker
1474
s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);
1475
skip_bits(&s->gb, 1); //marker
1478
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1479
av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)\n",
1480
s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
1481
s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
1482
s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]
1486
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra){
1489
for(i=0; i<64; i++) {
1490
int j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
1491
int v = get_bits(&s->gb, 8);
1493
av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
1496
if(intra && i==0 && v!=8){
1497
av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
1498
v= 8; // needed by pink.mpg / issue1046
1507
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
1509
dprintf(s->avctx, "matrix extension\n");
1511
if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
1512
if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
1513
if(get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL , 1);
1514
if(get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL , 0);
1517
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
1519
MpegEncContext *s= &s1->mpeg_enc_ctx;
1521
s->full_pel[0] = s->full_pel[1] = 0;
1522
s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
1523
s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
1524
s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
1525
s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
1526
if(!s->pict_type && s1->mpeg_enc_ctx_allocated){
1527
av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n");
1528
if(s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1]==15){
1529
if(s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
1530
s->pict_type= FF_I_TYPE;
1532
s->pict_type= FF_P_TYPE;
1534
s->pict_type= FF_B_TYPE;
1535
s->current_picture.pict_type= s->pict_type;
1536
s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
1538
s->intra_dc_precision = get_bits(&s->gb, 2);
1539
s->picture_structure = get_bits(&s->gb, 2);
1540
s->top_field_first = get_bits1(&s->gb);
1541
s->frame_pred_frame_dct = get_bits1(&s->gb);
1542
s->concealment_motion_vectors = get_bits1(&s->gb);
1543
s->q_scale_type = get_bits1(&s->gb);
1544
s->intra_vlc_format = get_bits1(&s->gb);
1545
s->alternate_scan = get_bits1(&s->gb);
1546
s->repeat_first_field = get_bits1(&s->gb);
1547
s->chroma_420_type = get_bits1(&s->gb);
1548
s->progressive_frame = get_bits1(&s->gb);
1550
if(s->progressive_sequence && !s->progressive_frame){
1551
s->progressive_frame= 1;
1552
av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n");
1555
if(s->picture_structure==0 || (s->progressive_frame && s->picture_structure!=PICT_FRAME)){
1556
av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure);
1557
s->picture_structure= PICT_FRAME;
1560
if(s->progressive_sequence && !s->frame_pred_frame_dct){
1561
av_log(s->avctx, AV_LOG_ERROR, "invalid frame_pred_frame_dct\n");
1562
s->frame_pred_frame_dct= 1;
1565
if(s->picture_structure == PICT_FRAME){
1567
s->v_edge_pos= 16*s->mb_height;
1569
s->first_field ^= 1;
1570
s->v_edge_pos= 8*s->mb_height;
1571
memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
1574
if(s->alternate_scan){
1575
ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
1576
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
1578
ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
1579
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
1582
/* composite display not parsed */
1583
dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
1584
dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
1585
dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
1586
dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
1587
dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
1588
dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
1589
dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
1590
dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
1591
dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
1594
static void exchange_uv(MpegEncContext *s){
1597
tmp = s->pblocks[4];
1598
s->pblocks[4] = s->pblocks[5];
1599
s->pblocks[5] = tmp;
1602
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size){
1603
AVCodecContext *avctx= s->avctx;
1604
Mpeg1Context *s1 = (Mpeg1Context*)s;
1606
/* start frame decoding */
1607
if(s->first_field || s->picture_structure==PICT_FRAME){
1608
if(MPV_frame_start(s, avctx) < 0)
1611
ff_er_frame_start(s);
1613
/* first check if we must repeat the frame */
1614
s->current_picture_ptr->repeat_pict = 0;
1615
if (s->repeat_first_field) {
1616
if (s->progressive_sequence) {
1617
if (s->top_field_first)
1618
s->current_picture_ptr->repeat_pict = 4;
1620
s->current_picture_ptr->repeat_pict = 2;
1621
} else if (s->progressive_frame) {
1622
s->current_picture_ptr->repeat_pict = 1;
1626
*s->current_picture_ptr->pan_scan= s1->pan_scan;
1627
}else{ //second field
1630
if(!s->current_picture_ptr){
1631
av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
1636
s->current_picture.data[i] = s->current_picture_ptr->data[i];
1637
if(s->picture_structure == PICT_BOTTOM_FIELD){
1638
s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
1643
if (avctx->hwaccel) {
1644
if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
1648
// MPV_frame_start will call this function too,
1649
// but we need to call it on every field
1650
if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1651
if(ff_xvmc_field_start(s,avctx) < 0)
1657
#define DECODE_SLICE_ERROR -1
1658
#define DECODE_SLICE_OK 0
1661
* decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
1662
* @return DECODE_SLICE_ERROR if the slice is damaged<br>
1663
* DECODE_SLICE_OK if this slice is ok<br>
1665
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
1666
const uint8_t **buf, int buf_size)
1668
MpegEncContext *s = &s1->mpeg_enc_ctx;
1669
AVCodecContext *avctx= s->avctx;
1670
const int field_pic= s->picture_structure != PICT_FRAME;
1671
const int lowres= s->avctx->lowres;
1676
assert(mb_y < s->mb_height);
1678
init_get_bits(&s->gb, *buf, buf_size*8);
1680
ff_mpeg1_clean_buffers(s);
1681
s->interlaced_dct = 0;
1683
s->qscale = get_qscale(s);
1686
av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
1690
/* extra slice info */
1691
while (get_bits1(&s->gb) != 0) {
1692
skip_bits(&s->gb, 8);
1697
if(mb_y==0 && s->codec_tag == AV_RL32("SLIF")){
1701
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1703
av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
1710
/* otherwise, stuffing, nothing to do */
1718
if(s->mb_x >= (unsigned)s->mb_width){
1719
av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
1723
if (avctx->hwaccel) {
1724
const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
1725
int start_code = -1;
1726
buf_end = ff_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
1727
if (buf_end < *buf + buf_size)
1730
if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
1731
return DECODE_SLICE_ERROR;
1733
return DECODE_SLICE_OK;
1736
s->resync_mb_x= s->mb_x;
1737
s->resync_mb_y= s->mb_y= mb_y;
1739
ff_init_block_index(s);
1741
if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) {
1742
if(s->avctx->debug&FF_DEBUG_PICT_INFO){
1743
av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
1744
s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
1745
s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
1746
s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
1747
s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
1748
s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
1753
//If 1, we memcpy blocks in xvmcvideo.
1754
if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
1755
ff_xvmc_init_block(s);//set s->block
1757
if(mpeg_decode_mb(s, s->block) < 0)
1760
if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs
1761
const int wrap = s->b8_stride;
1762
int xy = s->mb_x*2 + s->mb_y*2*wrap;
1763
int b8_xy= 4*(s->mb_x + s->mb_y*s->mb_stride);
1764
int motion_x, motion_y, dir, i;
1767
for(dir=0; dir<2; dir++){
1768
if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
1769
motion_x = motion_y = 0;
1770
}else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){
1771
motion_x = s->mv[dir][0][0];
1772
motion_y = s->mv[dir][0][1];
1773
} else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ {
1774
motion_x = s->mv[dir][i][0];
1775
motion_y = s->mv[dir][i][1];
1778
s->current_picture.motion_val[dir][xy ][0] = motion_x;
1779
s->current_picture.motion_val[dir][xy ][1] = motion_y;
1780
s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
1781
s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
1782
s->current_picture.ref_index [dir][b8_xy ]=
1783
s->current_picture.ref_index [dir][b8_xy + 1]= s->field_select[dir][i];
1784
assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
1791
s->dest[0] += 16 >> lowres;
1792
s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
1793
s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
1795
MPV_decode_mb(s, s->block);
1797
if (++s->mb_x >= s->mb_width) {
1798
const int mb_size= 16>>s->avctx->lowres;
1800
ff_draw_horiz_band(s, mb_size*(s->mb_y>>field_pic), mb_size);
1803
s->mb_y += 1<<field_pic;
1805
if(s->mb_y >= s->mb_height){
1806
int left= get_bits_left(&s->gb);
1807
int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && avctx->profile==0 && avctx->level==5
1808
&& s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0
1809
&& s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10*/;
1811
if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10)
1812
|| (avctx->error_recognition >= FF_ER_AGGRESSIVE && left>8)){
1813
av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23)));
1819
ff_init_block_index(s);
1822
/* skip mb handling */
1823
if (s->mb_skip_run == -1) {
1824
/* read increment again */
1827
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
1829
av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
1834
s->mb_skip_run += 33;
1835
}else if(code == 35){
1836
if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
1837
av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
1840
goto eos; /* end of slice */
1842
/* otherwise, stuffing, nothing to do */
1844
s->mb_skip_run += code;
1850
if(s->pict_type == FF_I_TYPE){
1851
av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
1858
s->block_last_index[i] = -1;
1859
if(s->picture_structure == PICT_FRAME)
1860
s->mv_type = MV_TYPE_16X16;
1862
s->mv_type = MV_TYPE_FIELD;
1863
if (s->pict_type == FF_P_TYPE) {
1864
/* if P type, zero motion vector is implied */
1865
s->mv_dir = MV_DIR_FORWARD;
1866
s->mv[0][0][0] = s->mv[0][0][1] = 0;
1867
s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
1868
s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
1869
s->field_select[0][0]= (s->picture_structure - 1) & 1;
1871
/* if B type, reuse previous vectors and directions */
1872
s->mv[0][0][0] = s->last_mv[0][0][0];
1873
s->mv[0][0][1] = s->last_mv[0][0][1];
1874
s->mv[1][0][0] = s->last_mv[1][0][0];
1875
s->mv[1][0][1] = s->last_mv[1][0][1];
1880
eos: // end of slice
1881
*buf += (get_bits_count(&s->gb)-1)/8;
1882
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
1886
static int slice_decode_thread(AVCodecContext *c, void *arg){
1887
MpegEncContext *s= *(void**)arg;
1888
const uint8_t *buf= s->gb.buffer;
1889
int mb_y= s->start_mb_y;
1890
const int field_pic= s->picture_structure != PICT_FRAME;
1892
s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;
1895
uint32_t start_code;
1898
ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
1900
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
1901
//ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
1903
if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
1904
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
1906
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
1909
if(s->mb_y == s->end_mb_y)
1913
buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
1914
mb_y= start_code - SLICE_MIN_START_CODE;
1915
if(mb_y < 0 || mb_y >= s->end_mb_y)
1919
return 0; //not reached
1923
* Handles slice ends.
1924
* @return 1 if it seems to be the last slice
1926
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
1928
Mpeg1Context *s1 = avctx->priv_data;
1929
MpegEncContext *s = &s1->mpeg_enc_ctx;
1931
if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
1934
if (s->avctx->hwaccel) {
1935
if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
1936
av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
1939
if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
1940
ff_xvmc_field_end(s);
1942
/* end of slice reached */
1943
if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
1946
s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
1952
if (s->pict_type == FF_B_TYPE || s->low_delay) {
1953
*pict= *(AVFrame*)s->current_picture_ptr;
1954
ff_print_debug_info(s, pict);
1956
s->picture_number++;
1957
/* latency of 1 frame for I- and P-frames */
1958
/* XXX: use another variable than picture_number */
1959
if (s->last_picture_ptr != NULL) {
1960
*pict= *(AVFrame*)s->last_picture_ptr;
1961
ff_print_debug_info(s, pict);
1971
static int mpeg1_decode_sequence(AVCodecContext *avctx,
1972
const uint8_t *buf, int buf_size)
1974
Mpeg1Context *s1 = avctx->priv_data;
1975
MpegEncContext *s = &s1->mpeg_enc_ctx;
1979
init_get_bits(&s->gb, buf, buf_size*8);
1981
width = get_bits(&s->gb, 12);
1982
height = get_bits(&s->gb, 12);
1983
if (width <= 0 || height <= 0)
1985
s->aspect_ratio_info= get_bits(&s->gb, 4);
1986
if (s->aspect_ratio_info == 0) {
1987
av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
1988
if (avctx->error_recognition >= FF_ER_COMPLIANT)
1991
s->frame_rate_index = get_bits(&s->gb, 4);
1992
if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
1994
s->bit_rate = get_bits(&s->gb, 18) * 400;
1995
if (get_bits1(&s->gb) == 0) /* marker */
2000
s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16;
2001
skip_bits(&s->gb, 1);
2004
if (get_bits1(&s->gb)) {
2005
load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
2008
j = s->dsp.idct_permutation[i];
2009
v = ff_mpeg1_default_intra_matrix[i];
2010
s->intra_matrix[j] = v;
2011
s->chroma_intra_matrix[j] = v;
2014
if (get_bits1(&s->gb)) {
2015
load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
2018
int j= s->dsp.idct_permutation[i];
2019
v = ff_mpeg1_default_non_intra_matrix[i];
2020
s->inter_matrix[j] = v;
2021
s->chroma_inter_matrix[j] = v;
2025
if(show_bits(&s->gb, 23) != 0){
2026
av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
2030
/* we set MPEG-2 parameters so that it emulates MPEG-1 */
2031
s->progressive_sequence = 1;
2032
s->progressive_frame = 1;
2033
s->picture_structure = PICT_FRAME;
2034
s->frame_pred_frame_dct = 1;
2035
s->chroma_format = 1;
2036
s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO;
2037
avctx->sub_id = 1; /* indicates MPEG-1 */
2038
s->out_format = FMT_MPEG1;
2039
s->swap_uv = 0;//AFAIK VCR2 does not have SEQ_HEADER
2040
if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1;
2042
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2043
av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
2044
s->avctx->rc_buffer_size, s->bit_rate);
2049
static int vcr2_init_sequence(AVCodecContext *avctx)
2051
Mpeg1Context *s1 = avctx->priv_data;
2052
MpegEncContext *s = &s1->mpeg_enc_ctx;
2055
/* start new MPEG-1 context decoding */
2056
s->out_format = FMT_MPEG1;
2057
if (s1->mpeg_enc_ctx_allocated) {
2060
s->width = avctx->coded_width;
2061
s->height = avctx->coded_height;
2062
avctx->has_b_frames= 0; //true?
2065
avctx->pix_fmt = mpeg_get_pixelformat(avctx);
2066
avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
2068
if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
2069
s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
2070
if( avctx->idct_algo == FF_IDCT_AUTO )
2071
avctx->idct_algo = FF_IDCT_SIMPLE;
2073
if (MPV_common_init(s) < 0)
2075
exchange_uv(s);//common init reset pblocks, so we swap them here
2076
s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB
2077
s1->mpeg_enc_ctx_allocated = 1;
2080
int j= s->dsp.idct_permutation[i];
2081
v = ff_mpeg1_default_intra_matrix[i];
2082
s->intra_matrix[j] = v;
2083
s->chroma_intra_matrix[j] = v;
2085
v = ff_mpeg1_default_non_intra_matrix[i];
2086
s->inter_matrix[j] = v;
2087
s->chroma_inter_matrix[j] = v;
2090
s->progressive_sequence = 1;
2091
s->progressive_frame = 1;
2092
s->picture_structure = PICT_FRAME;
2093
s->frame_pred_frame_dct = 1;
2094
s->chroma_format = 1;
2095
s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
2096
avctx->sub_id = 2; /* indicates MPEG-2 */
2097
s1->save_width = s->width;
2098
s1->save_height = s->height;
2099
s1->save_progressive_seq = s->progressive_sequence;
2104
static void mpeg_decode_user_data(AVCodecContext *avctx,
2105
const uint8_t *p, int buf_size)
2107
const uint8_t *buf_end = p+buf_size;
2109
/* we parse the DTG active format information */
2110
if (buf_end - p >= 5 &&
2111
p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
2119
if (buf_end - p < 1)
2121
avctx->dtg_active_format = p[0] & 0x0f;
2126
static void mpeg_decode_gop(AVCodecContext *avctx,
2127
const uint8_t *buf, int buf_size){
2128
Mpeg1Context *s1 = avctx->priv_data;
2129
MpegEncContext *s = &s1->mpeg_enc_ctx;
2131
int drop_frame_flag;
2132
int time_code_hours, time_code_minutes;
2133
int time_code_seconds, time_code_pictures;
2136
init_get_bits(&s->gb, buf, buf_size*8);
2138
drop_frame_flag = get_bits1(&s->gb);
2140
time_code_hours=get_bits(&s->gb,5);
2141
time_code_minutes = get_bits(&s->gb,6);
2142
skip_bits1(&s->gb);//marker bit
2143
time_code_seconds = get_bits(&s->gb,6);
2144
time_code_pictures = get_bits(&s->gb,6);
2146
s->closed_gop = get_bits1(&s->gb);
2147
/*broken_link indicate that after editing the
2148
reference frames of the first B-Frames after GOP I-Frame
2149
are missing (open gop)*/
2150
broken_link = get_bits1(&s->gb);
2152
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
2153
av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
2154
time_code_hours, time_code_minutes, time_code_seconds,
2155
time_code_pictures, s->closed_gop, broken_link);
2158
* Finds the end of the current frame in the bitstream.
182
* Find the end of the current frame in the bitstream.
2159
183
* @return the position of the first byte of the next frame, or -1
2161
185
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
2164
uint32_t state= pc->state;
188
uint32_t state = pc->state;
2166
190
/* EOF considered as end of frame */
2167
191
if (buf_size == 0)