/
vp3.c
2400 lines (2037 loc) · 83.2 KB
/
vp3.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (C) 2003-2004 the ffmpeg project
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* On2 VP3 Video Decoder
*
* VP3 Video Decoder by Mike Melanson (mike at multimedia.cx)
* For more information about the VP3 coding process, visit:
* http://wiki.multimedia.cx/index.php?title=On2_VP3
*
* Theora decoder by Alex Beregszaszi
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"
#include "dsputil.h"
#include "get_bits.h"
#include "vp3data.h"
#include "xiph.h"
#include "thread.h"
#define FRAGMENT_PIXELS 8
//FIXME split things out into their own arrays
typedef struct Vp3Fragment {
int16_t dc;
uint8_t coding_method;
uint8_t qpi;
} Vp3Fragment;
#define SB_NOT_CODED 0
#define SB_PARTIALLY_CODED 1
#define SB_FULLY_CODED 2
// This is the maximum length of a single long bit run that can be encoded
// for superblock coding or block qps. Theora special-cases this to read a
// bit instead of flipping the current bit to allow for runs longer than 4129.
#define MAXIMUM_LONG_BIT_RUN 4129
#define MODE_INTER_NO_MV 0
#define MODE_INTRA 1
#define MODE_INTER_PLUS_MV 2
#define MODE_INTER_LAST_MV 3
#define MODE_INTER_PRIOR_LAST 4
#define MODE_USING_GOLDEN 5
#define MODE_GOLDEN_MV 6
#define MODE_INTER_FOURMV 7
#define CODING_MODE_COUNT 8
/* special internal mode */
#define MODE_COPY 8
/* There are 6 preset schemes, plus a free-form scheme */
static const int ModeAlphabet[6][CODING_MODE_COUNT] =
{
/* scheme 1: Last motion vector dominates */
{ MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
MODE_INTER_PLUS_MV, MODE_INTER_NO_MV,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 2 */
{ MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
MODE_INTER_NO_MV, MODE_INTER_PLUS_MV,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 3 */
{ MODE_INTER_LAST_MV, MODE_INTER_PLUS_MV,
MODE_INTER_PRIOR_LAST, MODE_INTER_NO_MV,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 4 */
{ MODE_INTER_LAST_MV, MODE_INTER_PLUS_MV,
MODE_INTER_NO_MV, MODE_INTER_PRIOR_LAST,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 5: No motion vector dominates */
{ MODE_INTER_NO_MV, MODE_INTER_LAST_MV,
MODE_INTER_PRIOR_LAST, MODE_INTER_PLUS_MV,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 6 */
{ MODE_INTER_NO_MV, MODE_USING_GOLDEN,
MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
MODE_INTER_PLUS_MV, MODE_INTRA,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
};
static const uint8_t hilbert_offset[16][2] = {
{0,0}, {1,0}, {1,1}, {0,1},
{0,2}, {0,3}, {1,3}, {1,2},
{2,2}, {2,3}, {3,3}, {3,2},
{3,1}, {2,1}, {2,0}, {3,0}
};
#define MIN_DEQUANT_VAL 2
typedef struct Vp3DecodeContext {
AVCodecContext *avctx;
int theora, theora_tables;
int version;
int width, height;
int chroma_x_shift, chroma_y_shift;
AVFrame golden_frame;
AVFrame last_frame;
AVFrame current_frame;
int keyframe;
DSPContext dsp;
int flipped_image;
int last_slice_end;
int skip_loop_filter;
int qps[3];
int nqps;
int last_qps[3];
int superblock_count;
int y_superblock_width;
int y_superblock_height;
int y_superblock_count;
int c_superblock_width;
int c_superblock_height;
int c_superblock_count;
int u_superblock_start;
int v_superblock_start;
unsigned char *superblock_coding;
int macroblock_count;
int macroblock_width;
int macroblock_height;
int fragment_count;
int fragment_width[2];
int fragment_height[2];
Vp3Fragment *all_fragments;
int fragment_start[3];
int data_offset[3];
int8_t (*motion_val[2])[2];
ScanTable scantable;
/* tables */
uint16_t coded_dc_scale_factor[64];
uint32_t coded_ac_scale_factor[64];
uint8_t base_matrix[384][64];
uint8_t qr_count[2][3];
uint8_t qr_size [2][3][64];
uint16_t qr_base[2][3][64];
/**
* This is a list of all tokens in bitstream order. Reordering takes place
* by pulling from each level during IDCT. As a consequence, IDCT must be
* in Hilbert order, making the minimum slice height 64 for 4:2:0 and 32
* otherwise. The 32 different tokens with up to 12 bits of extradata are
* collapsed into 3 types, packed as follows:
* (from the low to high bits)
*
* 2 bits: type (0,1,2)
* 0: EOB run, 14 bits for run length (12 needed)
* 1: zero run, 7 bits for run length
* 7 bits for the next coefficient (3 needed)
* 2: coefficient, 14 bits (11 needed)
*
* Coefficients are signed, so are packed in the highest bits for automatic
* sign extension.
*/
int16_t *dct_tokens[3][64];
int16_t *dct_tokens_base;
#define TOKEN_EOB(eob_run) ((eob_run) << 2)
#define TOKEN_ZERO_RUN(coeff, zero_run) (((coeff) << 9) + ((zero_run) << 2) + 1)
#define TOKEN_COEFF(coeff) (((coeff) << 2) + 2)
/**
* number of blocks that contain DCT coefficients at the given level or higher
*/
int num_coded_frags[3][64];
int total_num_coded_frags;
/* this is a list of indexes into the all_fragments array indicating
* which of the fragments are coded */
int *coded_fragment_list[3];
VLC dc_vlc[16];
VLC ac_vlc_1[16];
VLC ac_vlc_2[16];
VLC ac_vlc_3[16];
VLC ac_vlc_4[16];
VLC superblock_run_length_vlc;
VLC fragment_run_length_vlc;
VLC mode_code_vlc;
VLC motion_vector_vlc;
/* these arrays need to be on 16-byte boundaries since SSE2 operations
* index into them */
DECLARE_ALIGNED(16, int16_t, qmat)[3][2][3][64]; ///< qmat[qpi][is_inter][plane]
/* This table contains superblock_count * 16 entries. Each set of 16
* numbers corresponds to the fragment indexes 0..15 of the superblock.
* An entry will be -1 to indicate that no entry corresponds to that
* index. */
int *superblock_fragments;
/* This is an array that indicates how a particular macroblock
* is coded. */
unsigned char *macroblock_coding;
uint8_t *edge_emu_buffer;
/* Huffman decode */
int hti;
unsigned int hbits;
int entries;
int huff_code_size;
uint32_t huffman_table[80][32][2];
uint8_t filter_limit_values[64];
DECLARE_ALIGNED(8, int, bounding_values_array)[256+2];
} Vp3DecodeContext;
/************************************************************************
* VP3 specific functions
************************************************************************/
static void vp3_decode_flush(AVCodecContext *avctx)
{
Vp3DecodeContext *s = avctx->priv_data;
if (s->golden_frame.data[0]) {
if (s->golden_frame.data[0] == s->last_frame.data[0])
memset(&s->last_frame, 0, sizeof(AVFrame));
if (s->current_frame.data[0] == s->golden_frame.data[0])
memset(&s->current_frame, 0, sizeof(AVFrame));
ff_thread_release_buffer(avctx, &s->golden_frame);
}
if (s->last_frame.data[0]) {
if (s->current_frame.data[0] == s->last_frame.data[0])
memset(&s->current_frame, 0, sizeof(AVFrame));
ff_thread_release_buffer(avctx, &s->last_frame);
}
if (s->current_frame.data[0])
ff_thread_release_buffer(avctx, &s->current_frame);
}
static av_cold int vp3_decode_end(AVCodecContext *avctx)
{
Vp3DecodeContext *s = avctx->priv_data;
int i;
av_free(s->superblock_coding);
av_free(s->all_fragments);
av_free(s->coded_fragment_list[0]);
av_free(s->dct_tokens_base);
av_free(s->superblock_fragments);
av_free(s->macroblock_coding);
av_free(s->motion_val[0]);
av_free(s->motion_val[1]);
av_free(s->edge_emu_buffer);
if (avctx->internal->is_copy)
return 0;
for (i = 0; i < 16; i++) {
ff_free_vlc(&s->dc_vlc[i]);
ff_free_vlc(&s->ac_vlc_1[i]);
ff_free_vlc(&s->ac_vlc_2[i]);
ff_free_vlc(&s->ac_vlc_3[i]);
ff_free_vlc(&s->ac_vlc_4[i]);
}
ff_free_vlc(&s->superblock_run_length_vlc);
ff_free_vlc(&s->fragment_run_length_vlc);
ff_free_vlc(&s->mode_code_vlc);
ff_free_vlc(&s->motion_vector_vlc);
/* release all frames */
vp3_decode_flush(avctx);
return 0;
}
/*
* This function sets up all of the various blocks mappings:
* superblocks <-> fragments, macroblocks <-> fragments,
* superblocks <-> macroblocks
*
* @return 0 is successful; returns 1 if *anything* went wrong.
*/
static int init_block_mapping(Vp3DecodeContext *s)
{
int sb_x, sb_y, plane;
int x, y, i, j = 0;
for (plane = 0; plane < 3; plane++) {
int sb_width = plane ? s->c_superblock_width : s->y_superblock_width;
int sb_height = plane ? s->c_superblock_height : s->y_superblock_height;
int frag_width = s->fragment_width[!!plane];
int frag_height = s->fragment_height[!!plane];
for (sb_y = 0; sb_y < sb_height; sb_y++)
for (sb_x = 0; sb_x < sb_width; sb_x++)
for (i = 0; i < 16; i++) {
x = 4*sb_x + hilbert_offset[i][0];
y = 4*sb_y + hilbert_offset[i][1];
if (x < frag_width && y < frag_height)
s->superblock_fragments[j++] = s->fragment_start[plane] + y*frag_width + x;
else
s->superblock_fragments[j++] = -1;
}
}
return 0; /* successful path out */
}
/*
* This function sets up the dequantization tables used for a particular
* frame.
*/
static void init_dequantizer(Vp3DecodeContext *s, int qpi)
{
int ac_scale_factor = s->coded_ac_scale_factor[s->qps[qpi]];
int dc_scale_factor = s->coded_dc_scale_factor[s->qps[qpi]];
int i, plane, inter, qri, bmi, bmj, qistart;
for(inter=0; inter<2; inter++){
for(plane=0; plane<3; plane++){
int sum=0;
for(qri=0; qri<s->qr_count[inter][plane]; qri++){
sum+= s->qr_size[inter][plane][qri];
if(s->qps[qpi] <= sum)
break;
}
qistart= sum - s->qr_size[inter][plane][qri];
bmi= s->qr_base[inter][plane][qri ];
bmj= s->qr_base[inter][plane][qri+1];
for(i=0; i<64; i++){
int coeff= ( 2*(sum -s->qps[qpi])*s->base_matrix[bmi][i]
- 2*(qistart-s->qps[qpi])*s->base_matrix[bmj][i]
+ s->qr_size[inter][plane][qri])
/ (2*s->qr_size[inter][plane][qri]);
int qmin= 8<<(inter + !i);
int qscale= i ? ac_scale_factor : dc_scale_factor;
s->qmat[qpi][inter][plane][s->dsp.idct_permutation[i]]= av_clip((qscale * coeff)/100 * 4, qmin, 4096);
}
// all DC coefficients use the same quant so as not to interfere with DC prediction
s->qmat[qpi][inter][plane][0] = s->qmat[0][inter][plane][0];
}
}
}
/*
* This function initializes the loop filter boundary limits if the frame's
* quality index is different from the previous frame's.
*
* The filter_limit_values may not be larger than 127.
*/
static void init_loop_filter(Vp3DecodeContext *s)
{
int *bounding_values= s->bounding_values_array+127;
int filter_limit;
int x;
int value;
filter_limit = s->filter_limit_values[s->qps[0]];
/* set up the bounding values */
memset(s->bounding_values_array, 0, 256 * sizeof(int));
for (x = 0; x < filter_limit; x++) {
bounding_values[-x] = -x;
bounding_values[x] = x;
}
for (x = value = filter_limit; x < 128 && value; x++, value--) {
bounding_values[ x] = value;
bounding_values[-x] = -value;
}
if (value)
bounding_values[128] = value;
bounding_values[129] = bounding_values[130] = filter_limit * 0x02020202;
}
/*
* This function unpacks all of the superblock/macroblock/fragment coding
* information from the bitstream.
*/
static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
{
int superblock_starts[3] = { 0, s->u_superblock_start, s->v_superblock_start };
int bit = 0;
int current_superblock = 0;
int current_run = 0;
int num_partial_superblocks = 0;
int i, j;
int current_fragment;
int plane;
if (s->keyframe) {
memset(s->superblock_coding, SB_FULLY_CODED, s->superblock_count);
} else {
/* unpack the list of partially-coded superblocks */
bit = get_bits1(gb) ^ 1;
current_run = 0;
while (current_superblock < s->superblock_count && get_bits_left(gb) > 0) {
if (s->theora && current_run == MAXIMUM_LONG_BIT_RUN)
bit = get_bits1(gb);
else
bit ^= 1;
current_run = get_vlc2(gb,
s->superblock_run_length_vlc.table, 6, 2) + 1;
if (current_run == 34)
current_run += get_bits(gb, 12);
if (current_superblock + current_run > s->superblock_count) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid partially coded superblock run length\n");
return -1;
}
memset(s->superblock_coding + current_superblock, bit, current_run);
current_superblock += current_run;
if (bit)
num_partial_superblocks += current_run;
}
/* unpack the list of fully coded superblocks if any of the blocks were
* not marked as partially coded in the previous step */
if (num_partial_superblocks < s->superblock_count) {
int superblocks_decoded = 0;
current_superblock = 0;
bit = get_bits1(gb) ^ 1;
current_run = 0;
while (superblocks_decoded < s->superblock_count - num_partial_superblocks
&& get_bits_left(gb) > 0) {
if (s->theora && current_run == MAXIMUM_LONG_BIT_RUN)
bit = get_bits1(gb);
else
bit ^= 1;
current_run = get_vlc2(gb,
s->superblock_run_length_vlc.table, 6, 2) + 1;
if (current_run == 34)
current_run += get_bits(gb, 12);
for (j = 0; j < current_run; current_superblock++) {
if (current_superblock >= s->superblock_count) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid fully coded superblock run length\n");
return -1;
}
/* skip any superblocks already marked as partially coded */
if (s->superblock_coding[current_superblock] == SB_NOT_CODED) {
s->superblock_coding[current_superblock] = 2*bit;
j++;
}
}
superblocks_decoded += current_run;
}
}
/* if there were partial blocks, initialize bitstream for
* unpacking fragment codings */
if (num_partial_superblocks) {
current_run = 0;
bit = get_bits1(gb);
/* toggle the bit because as soon as the first run length is
* fetched the bit will be toggled again */
bit ^= 1;
}
}
/* figure out which fragments are coded; iterate through each
* superblock (all planes) */
s->total_num_coded_frags = 0;
memset(s->macroblock_coding, MODE_COPY, s->macroblock_count);
for (plane = 0; plane < 3; plane++) {
int sb_start = superblock_starts[plane];
int sb_end = sb_start + (plane ? s->c_superblock_count : s->y_superblock_count);
int num_coded_frags = 0;
for (i = sb_start; i < sb_end && get_bits_left(gb) > 0; i++) {
/* iterate through all 16 fragments in a superblock */
for (j = 0; j < 16; j++) {
/* if the fragment is in bounds, check its coding status */
current_fragment = s->superblock_fragments[i * 16 + j];
if (current_fragment != -1) {
int coded = s->superblock_coding[i];
if (s->superblock_coding[i] == SB_PARTIALLY_CODED) {
/* fragment may or may not be coded; this is the case
* that cares about the fragment coding runs */
if (current_run-- == 0) {
bit ^= 1;
current_run = get_vlc2(gb,
s->fragment_run_length_vlc.table, 5, 2);
}
coded = bit;
}
if (coded) {
/* default mode; actual mode will be decoded in
* the next phase */
s->all_fragments[current_fragment].coding_method =
MODE_INTER_NO_MV;
s->coded_fragment_list[plane][num_coded_frags++] =
current_fragment;
} else {
/* not coded; copy this fragment from the prior frame */
s->all_fragments[current_fragment].coding_method =
MODE_COPY;
}
}
}
}
s->total_num_coded_frags += num_coded_frags;
for (i = 0; i < 64; i++)
s->num_coded_frags[plane][i] = num_coded_frags;
if (plane < 2)
s->coded_fragment_list[plane+1] = s->coded_fragment_list[plane] + num_coded_frags;
}
return 0;
}
/*
* This function unpacks all the coding mode data for individual macroblocks
* from the bitstream.
*/
static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
{
int i, j, k, sb_x, sb_y;
int scheme;
int current_macroblock;
int current_fragment;
int coding_mode;
int custom_mode_alphabet[CODING_MODE_COUNT];
const int *alphabet;
Vp3Fragment *frag;
if (s->keyframe) {
for (i = 0; i < s->fragment_count; i++)
s->all_fragments[i].coding_method = MODE_INTRA;
} else {
/* fetch the mode coding scheme for this frame */
scheme = get_bits(gb, 3);
/* is it a custom coding scheme? */
if (scheme == 0) {
for (i = 0; i < 8; i++)
custom_mode_alphabet[i] = MODE_INTER_NO_MV;
for (i = 0; i < 8; i++)
custom_mode_alphabet[get_bits(gb, 3)] = i;
alphabet = custom_mode_alphabet;
} else
alphabet = ModeAlphabet[scheme-1];
/* iterate through all of the macroblocks that contain 1 or more
* coded fragments */
for (sb_y = 0; sb_y < s->y_superblock_height; sb_y++) {
for (sb_x = 0; sb_x < s->y_superblock_width; sb_x++) {
if (get_bits_left(gb) <= 0)
return -1;
for (j = 0; j < 4; j++) {
int mb_x = 2*sb_x + (j>>1);
int mb_y = 2*sb_y + (((j>>1)+j)&1);
current_macroblock = mb_y * s->macroblock_width + mb_x;
if (mb_x >= s->macroblock_width || mb_y >= s->macroblock_height)
continue;
#define BLOCK_X (2*mb_x + (k&1))
#define BLOCK_Y (2*mb_y + (k>>1))
/* coding modes are only stored if the macroblock has at least one
* luma block coded, otherwise it must be INTER_NO_MV */
for (k = 0; k < 4; k++) {
current_fragment = BLOCK_Y*s->fragment_width[0] + BLOCK_X;
if (s->all_fragments[current_fragment].coding_method != MODE_COPY)
break;
}
if (k == 4) {
s->macroblock_coding[current_macroblock] = MODE_INTER_NO_MV;
continue;
}
/* mode 7 means get 3 bits for each coding mode */
if (scheme == 7)
coding_mode = get_bits(gb, 3);
else
coding_mode = alphabet
[get_vlc2(gb, s->mode_code_vlc.table, 3, 3)];
s->macroblock_coding[current_macroblock] = coding_mode;
for (k = 0; k < 4; k++) {
frag = s->all_fragments + BLOCK_Y*s->fragment_width[0] + BLOCK_X;
if (frag->coding_method != MODE_COPY)
frag->coding_method = coding_mode;
}
#define SET_CHROMA_MODES \
if (frag[s->fragment_start[1]].coding_method != MODE_COPY) \
frag[s->fragment_start[1]].coding_method = coding_mode;\
if (frag[s->fragment_start[2]].coding_method != MODE_COPY) \
frag[s->fragment_start[2]].coding_method = coding_mode;
if (s->chroma_y_shift) {
frag = s->all_fragments + mb_y*s->fragment_width[1] + mb_x;
SET_CHROMA_MODES
} else if (s->chroma_x_shift) {
frag = s->all_fragments + 2*mb_y*s->fragment_width[1] + mb_x;
for (k = 0; k < 2; k++) {
SET_CHROMA_MODES
frag += s->fragment_width[1];
}
} else {
for (k = 0; k < 4; k++) {
frag = s->all_fragments + BLOCK_Y*s->fragment_width[1] + BLOCK_X;
SET_CHROMA_MODES
}
}
}
}
}
}
return 0;
}
/*
* This function unpacks all the motion vectors for the individual
* macroblocks from the bitstream.
*/
static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
{
int j, k, sb_x, sb_y;
int coding_mode;
int motion_x[4];
int motion_y[4];
int last_motion_x = 0;
int last_motion_y = 0;
int prior_last_motion_x = 0;
int prior_last_motion_y = 0;
int current_macroblock;
int current_fragment;
int frag;
if (s->keyframe)
return 0;
/* coding mode 0 is the VLC scheme; 1 is the fixed code scheme */
coding_mode = get_bits1(gb);
/* iterate through all of the macroblocks that contain 1 or more
* coded fragments */
for (sb_y = 0; sb_y < s->y_superblock_height; sb_y++) {
for (sb_x = 0; sb_x < s->y_superblock_width; sb_x++) {
if (get_bits_left(gb) <= 0)
return -1;
for (j = 0; j < 4; j++) {
int mb_x = 2*sb_x + (j>>1);
int mb_y = 2*sb_y + (((j>>1)+j)&1);
current_macroblock = mb_y * s->macroblock_width + mb_x;
if (mb_x >= s->macroblock_width || mb_y >= s->macroblock_height ||
(s->macroblock_coding[current_macroblock] == MODE_COPY))
continue;
switch (s->macroblock_coding[current_macroblock]) {
case MODE_INTER_PLUS_MV:
case MODE_GOLDEN_MV:
/* all 6 fragments use the same motion vector */
if (coding_mode == 0) {
motion_x[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
motion_y[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
} else {
motion_x[0] = fixed_motion_vector_table[get_bits(gb, 6)];
motion_y[0] = fixed_motion_vector_table[get_bits(gb, 6)];
}
/* vector maintenance, only on MODE_INTER_PLUS_MV */
if (s->macroblock_coding[current_macroblock] ==
MODE_INTER_PLUS_MV) {
prior_last_motion_x = last_motion_x;
prior_last_motion_y = last_motion_y;
last_motion_x = motion_x[0];
last_motion_y = motion_y[0];
}
break;
case MODE_INTER_FOURMV:
/* vector maintenance */
prior_last_motion_x = last_motion_x;
prior_last_motion_y = last_motion_y;
/* fetch 4 vectors from the bitstream, one for each
* Y fragment, then average for the C fragment vectors */
for (k = 0; k < 4; k++) {
current_fragment = BLOCK_Y*s->fragment_width[0] + BLOCK_X;
if (s->all_fragments[current_fragment].coding_method != MODE_COPY) {
if (coding_mode == 0) {
motion_x[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
motion_y[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
} else {
motion_x[k] = fixed_motion_vector_table[get_bits(gb, 6)];
motion_y[k] = fixed_motion_vector_table[get_bits(gb, 6)];
}
last_motion_x = motion_x[k];
last_motion_y = motion_y[k];
} else {
motion_x[k] = 0;
motion_y[k] = 0;
}
}
break;
case MODE_INTER_LAST_MV:
/* all 6 fragments use the last motion vector */
motion_x[0] = last_motion_x;
motion_y[0] = last_motion_y;
/* no vector maintenance (last vector remains the
* last vector) */
break;
case MODE_INTER_PRIOR_LAST:
/* all 6 fragments use the motion vector prior to the
* last motion vector */
motion_x[0] = prior_last_motion_x;
motion_y[0] = prior_last_motion_y;
/* vector maintenance */
prior_last_motion_x = last_motion_x;
prior_last_motion_y = last_motion_y;
last_motion_x = motion_x[0];
last_motion_y = motion_y[0];
break;
default:
/* covers intra, inter without MV, golden without MV */
motion_x[0] = 0;
motion_y[0] = 0;
/* no vector maintenance */
break;
}
/* assign the motion vectors to the correct fragments */
for (k = 0; k < 4; k++) {
current_fragment =
BLOCK_Y*s->fragment_width[0] + BLOCK_X;
if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
s->motion_val[0][current_fragment][0] = motion_x[k];
s->motion_val[0][current_fragment][1] = motion_y[k];
} else {
s->motion_val[0][current_fragment][0] = motion_x[0];
s->motion_val[0][current_fragment][1] = motion_y[0];
}
}
if (s->chroma_y_shift) {
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);
}
motion_x[0] = (motion_x[0]>>1) | (motion_x[0]&1);
motion_y[0] = (motion_y[0]>>1) | (motion_y[0]&1);
frag = mb_y*s->fragment_width[1] + mb_x;
s->motion_val[1][frag][0] = motion_x[0];
s->motion_val[1][frag][1] = motion_y[0];
} else if (s->chroma_x_shift) {
if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
motion_x[0] = RSHIFT(motion_x[0] + motion_x[1], 1);
motion_y[0] = RSHIFT(motion_y[0] + motion_y[1], 1);
motion_x[1] = RSHIFT(motion_x[2] + motion_x[3], 1);
motion_y[1] = RSHIFT(motion_y[2] + motion_y[3], 1);
} else {
motion_x[1] = motion_x[0];
motion_y[1] = motion_y[0];
}
motion_x[0] = (motion_x[0]>>1) | (motion_x[0]&1);
motion_x[1] = (motion_x[1]>>1) | (motion_x[1]&1);
frag = 2*mb_y*s->fragment_width[1] + mb_x;
for (k = 0; k < 2; k++) {
s->motion_val[1][frag][0] = motion_x[k];
s->motion_val[1][frag][1] = motion_y[k];
frag += s->fragment_width[1];
}
} else {
for (k = 0; k < 4; k++) {
frag = BLOCK_Y*s->fragment_width[1] + BLOCK_X;
if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
s->motion_val[1][frag][0] = motion_x[k];
s->motion_val[1][frag][1] = motion_y[k];
} else {
s->motion_val[1][frag][0] = motion_x[0];
s->motion_val[1][frag][1] = motion_y[0];
}
}
}
}
}
}
return 0;
}
static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb)
{
int qpi, i, j, bit, run_length, blocks_decoded, num_blocks_at_qpi;
int num_blocks = s->total_num_coded_frags;
for (qpi = 0; qpi < s->nqps-1 && num_blocks > 0; qpi++) {
i = blocks_decoded = num_blocks_at_qpi = 0;
bit = get_bits1(gb) ^ 1;
run_length = 0;
do {
if (run_length == MAXIMUM_LONG_BIT_RUN)
bit = get_bits1(gb);
else
bit ^= 1;
run_length = get_vlc2(gb, s->superblock_run_length_vlc.table, 6, 2) + 1;
if (run_length == 34)
run_length += get_bits(gb, 12);
blocks_decoded += run_length;
if (!bit)
num_blocks_at_qpi += run_length;
for (j = 0; j < run_length; i++) {
if (i >= s->total_num_coded_frags)
return -1;
if (s->all_fragments[s->coded_fragment_list[0][i]].qpi == qpi) {
s->all_fragments[s->coded_fragment_list[0][i]].qpi += bit;
j++;
}
}
} while (blocks_decoded < num_blocks && get_bits_left(gb) > 0);
num_blocks -= num_blocks_at_qpi;
}
return 0;
}
/*
* This function is called by unpack_dct_coeffs() to extract the VLCs from
* the bitstream. The VLCs encode tokens which are used to unpack DCT
* data. This function unpacks all the VLCs for either the Y plane or both
* C planes, and is called for DC coefficients or different AC coefficient
* levels (since different coefficient types require different VLC tables.
*
* This function returns a residual eob run. E.g, if a particular token gave
* instructions to EOB the next 5 fragments and there were only 2 fragments
* left in the current fragment range, 3 would be returned so that it could
* be passed into the next call to this same function.
*/
static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
VLC *table, int coeff_index,
int plane,
int eob_run)
{
int i, j = 0;
int token;
int zero_run = 0;
DCTELEM coeff = 0;
int bits_to_get;
int blocks_ended;
int coeff_i = 0;
int num_coeffs = s->num_coded_frags[plane][coeff_index];
int16_t *dct_tokens = s->dct_tokens[plane][coeff_index];
/* local references to structure members to avoid repeated deferences */
int *coded_fragment_list = s->coded_fragment_list[plane];
Vp3Fragment *all_fragments = s->all_fragments;
VLC_TYPE (*vlc_table)[2] = table->table;
if (num_coeffs < 0)
av_log(s->avctx, AV_LOG_ERROR, "Invalid number of coefficents at level %d\n", coeff_index);
if (eob_run > num_coeffs) {
coeff_i = blocks_ended = num_coeffs;
eob_run -= num_coeffs;
} else {
coeff_i = blocks_ended = eob_run;
eob_run = 0;
}
// insert fake EOB token to cover the split between planes or zzi
if (blocks_ended)
dct_tokens[j++] = blocks_ended << 2;
while (coeff_i < num_coeffs && get_bits_left(gb) > 0) {
/* decode a VLC into a token */
token = get_vlc2(gb, vlc_table, 11, 3);
/* use the token to get a zero run, a coefficient, and an eob run */
if ((unsigned) token <= 6U) {
eob_run = eob_run_base[token];
if (eob_run_get_bits[token])
eob_run += get_bits(gb, eob_run_get_bits[token]);
// record only the number of blocks ended in this plane,
// any spill will be recorded in the next plane.
if (eob_run > num_coeffs - coeff_i) {
dct_tokens[j++] = TOKEN_EOB(num_coeffs - coeff_i);
blocks_ended += num_coeffs - coeff_i;
eob_run -= num_coeffs - coeff_i;
coeff_i = num_coeffs;
} else {
dct_tokens[j++] = TOKEN_EOB(eob_run);
blocks_ended += eob_run;
coeff_i += eob_run;
eob_run = 0;
}
} else if (token >= 0) {
bits_to_get = coeff_get_bits[token];
if (bits_to_get)
bits_to_get = get_bits(gb, bits_to_get);
coeff = coeff_tables[token][bits_to_get];
zero_run = zero_run_base[token];
if (zero_run_get_bits[token])
zero_run += get_bits(gb, zero_run_get_bits[token]);
if (zero_run) {
dct_tokens[j++] = TOKEN_ZERO_RUN(coeff, zero_run);
} else {
// Save DC into the fragment structure. DC prediction is
// done in raster order, so the actual DC can't be in with
// other tokens. We still need the token in dct_tokens[]
// however, or else the structure collapses on itself.
if (!coeff_index)
all_fragments[coded_fragment_list[coeff_i]].dc = coeff;
dct_tokens[j++] = TOKEN_COEFF(coeff);
}
if (coeff_index + zero_run > 64) {
av_log(s->avctx, AV_LOG_DEBUG, "Invalid zero run of %d with"
" %d coeffs left\n", zero_run, 64-coeff_index);
zero_run = 64 - coeff_index;
}
// zero runs code multiple coefficients,
// so don't try to decode coeffs for those higher levels
for (i = coeff_index+1; i <= coeff_index+zero_run; i++)
s->num_coded_frags[plane][i]--;
coeff_i++;