summaryrefslogtreecommitdiffstats
path: root/libavcodec/dv.c
blob: 462cbbed451cba4766f9b2394497318ec2045e7b (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
/*
 * DV decoder
 * Copyright (c) 2002 Fabrice Bellard
 * Copyright (c) 2004 Roman Shaposhnik
 *
 * DV encoder
 * Copyright (c) 2003 Roman Shaposhnik
 *
 * 50 Mbps (DVCPRO50) support
 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
 *
 * 100 Mbps (DVCPRO HD) support
 * Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D)
 * Final code by Roman Shaposhnik
 *
 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
 * of DV technical info.
 *
 * 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
 * DV codec.
 */
#define ALT_BITSTREAM_READER
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h"
#include "put_bits.h"
#include "simple_idct.h"
#include "dvdata.h"
#include "dv_tablegen.h"

//#undef NDEBUG
//#include <assert.h>

typedef struct DVVideoContext {
    const DVprofile *sys;
    AVFrame          picture;
    AVCodecContext  *avctx;
    uint8_t         *buf;

    uint8_t  dv_zigzag[2][64];

    void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
    void (*fdct[2])(DCTELEM *block);
    void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
    me_cmp_func ildct_cmp;
} DVVideoContext;

#define TEX_VLC_BITS 9

/* XXX: also include quantization */
static RL_VLC_ELEM dv_rl_vlc[1184];

static inline int dv_work_pool_size(const DVprofile *d)
{
    int size = d->n_difchan*d->difseg_size*27;
    if (DV_PROFILE_IS_1080i50(d))
        size -= 3*27;
    if (DV_PROFILE_IS_720p50(d))
        size -= 4*27;
    return size;
}

static inline void dv_calc_mb_coordinates(const DVprofile *d, int chan, int seq, int slot,
                                          uint16_t *tbl)
{
    static const uint8_t off[] = { 2, 6, 8, 0, 4 };
    static const uint8_t shuf1[] = { 36, 18, 54, 0, 72 };
    static const uint8_t shuf2[] = { 24, 12, 36, 0, 48 };
    static const uint8_t shuf3[] = { 18, 9, 27, 0, 36 };

    static const uint8_t l_start[] = {0, 4, 9, 13, 18, 22, 27, 31, 36, 40};
    static const uint8_t l_start_shuffled[] = { 9, 4, 13, 0, 18 };

    static const uint8_t serpent1[] = {0, 1, 2, 2, 1, 0,
                                       0, 1, 2, 2, 1, 0,
                                       0, 1, 2, 2, 1, 0,
                                       0, 1, 2, 2, 1, 0,
                                       0, 1, 2};
    static const uint8_t serpent2[] = {0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
                                       0, 1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 0,
                                       0, 1, 2, 3, 4, 5};

    static const uint8_t remap[][2] = {{ 0, 0}, { 0, 0}, { 0, 0}, { 0, 0}, /* dummy */
                                       { 0, 0}, { 0, 1}, { 0, 2}, { 0, 3}, {10, 0},
                                       {10, 1}, {10, 2}, {10, 3}, {20, 0}, {20, 1},
                                       {20, 2}, {20, 3}, {30, 0}, {30, 1}, {30, 2},
                                       {30, 3}, {40, 0}, {40, 1}, {40, 2}, {40, 3},
                                       {50, 0}, {50, 1}, {50, 2}, {50, 3}, {60, 0},
                                       {60, 1}, {60, 2}, {60, 3}, {70, 0}, {70, 1},
                                       {70, 2}, {70, 3}, { 0,64}, { 0,65}, { 0,66},
                                       {10,64}, {10,65}, {10,66}, {20,64}, {20,65},
                                       {20,66}, {30,64}, {30,65}, {30,66}, {40,64},
                                       {40,65}, {40,66}, {50,64}, {50,65}, {50,66},
                                       {60,64}, {60,65}, {60,66}, {70,64}, {70,65},
                                       {70,66}, { 0,67}, {20,67}, {40,67}, {60,67}};

    int i, k, m;
    int x, y, blk;

    for (m=0; m<5; m++) {
         switch (d->width) {
         case 1440:
              blk = (chan*11+seq)*27+slot;

              if (chan == 0 && seq == 11) {
                  x = m*27+slot;
                  if (x<90) {
                      y = 0;
                  } else {
                      x = (x - 90)*2;
                      y = 67;
                  }
              } else {
                  i = (4*chan + blk + off[m])%11;
                  k = (blk/11)%27;

                  x = shuf1[m] + (chan&1)*9 + k%9;
                  y = (i*3+k/9)*2 + (chan>>1) + 1;
              }
              tbl[m] = (x<<1)|(y<<9);
              break;
         case 1280:
              blk = (chan*10+seq)*27+slot;

              i = (4*chan + (seq/5) + 2*blk + off[m])%10;
              k = (blk/5)%27;

              x = shuf1[m]+(chan&1)*9 + k%9;
              y = (i*3+k/9)*2 + (chan>>1) + 4;

              if (x >= 80) {
                  x = remap[y][0]+((x-80)<<(y>59));
                  y = remap[y][1];
              }
              tbl[m] = (x<<1)|(y<<9);
              break;
       case 960:
              blk = (chan*10+seq)*27+slot;

              i = (4*chan + (seq/5) + 2*blk + off[m])%10;
              k = (blk/5)%27 + (i&1)*3;

              x = shuf2[m] + k%6 + 6*(chan&1);
              y = l_start[i] + k/6 + 45*(chan>>1);
              tbl[m] = (x<<1)|(y<<9);
              break;
        case 720:
              switch (d->pix_fmt) {
              case PIX_FMT_YUV422P:
                   x = shuf3[m] + slot/3;
                   y = serpent1[slot] +
                       ((((seq + off[m]) % d->difseg_size)<<1) + chan)*3;
                   tbl[m] = (x<<1)|(y<<8);
                   break;
              case PIX_FMT_YUV420P:
                   x = shuf3[m] + slot/3;
                   y = serpent1[slot] +
                       ((seq + off[m]) % d->difseg_size)*3;
                   tbl[m] = (x<<1)|(y<<9);
                   break;
              case PIX_FMT_YUV411P:
                   i = (seq + off[m]) % d->difseg_size;
                   k = slot + ((m==1||m==2)?3:0);

                   x = l_start_shuffled[m] + k/6;
                   y = serpent2[k] + i*6;
                   if (x>21)
                       y = y*2 - i*6;
                   tbl[m] = (x<<2)|(y<<8);
                   break;
              }
        default:
              break;
        }
    }
}

static int dv_init_dynamic_tables(const DVprofile *d)
{
    int j,i,c,s,p;
    uint32_t *factor1, *factor2;
    const int *iweight1, *iweight2;

    if (!d->work_chunks[dv_work_pool_size(d)-1].buf_offset) {
        p = i = 0;
        for (c=0; c<d->n_difchan; c++) {
            for (s=0; s<d->difseg_size; s++) {
                p += 6;
                for (j=0; j<27; j++) {
                    p += !(j%3);
                    if (!(DV_PROFILE_IS_1080i50(d) && c != 0 && s == 11) &&
                        !(DV_PROFILE_IS_720p50(d) && s > 9)) {
                          dv_calc_mb_coordinates(d, c, s, j, &d->work_chunks[i].mb_coordinates[0]);
                          d->work_chunks[i++].buf_offset = p;
                    }
                    p += 5;
                }
            }
        }
    }

    if (!d->idct_factor[DV_PROFILE_IS_HD(d)?8191:5631]) {
        factor1 = &d->idct_factor[0];
        factor2 = &d->idct_factor[DV_PROFILE_IS_HD(d)?4096:2816];
        if (d->height == 720) {
            iweight1 = &dv_iweight_720_y[0];
            iweight2 = &dv_iweight_720_c[0];
        } else {
            iweight1 = &dv_iweight_1080_y[0];
            iweight2 = &dv_iweight_1080_c[0];
        }
        if (DV_PROFILE_IS_HD(d)) {
            for (c = 0; c < 4; c++) {
                for (s = 0; s < 16; s++) {
                    for (i = 0; i < 64; i++) {
                        *factor1++ = (dv100_qstep[s] << (c + 9)) * iweight1[i];
                        *factor2++ = (dv100_qstep[s] << (c + 9)) * iweight2[i];
                    }
                }
            }
        } else {
            iweight1 = &dv_iweight_88[0];
            for (j = 0; j < 2; j++, iweight1 = &dv_iweight_248[0]) {
                for (s = 0; s < 22; s++) {
                    for (i = c = 0; c < 4; c++) {
                        for (; i < dv_quant_areas[c]; i++) {
                            *factor1   = iweight1[i] << (dv_quant_shifts[s][c] + 1);
                            *factor2++ = (*factor1++) << 1;
                        }
                    }
                }
            }
        }
    }

    return 0;
}

static av_cold int dvvideo_init(AVCodecContext *avctx)
{
    DVVideoContext *s = avctx->priv_data;
    DSPContext dsp;
    static int done = 0;
    int i, j;

    if (!done) {
        VLC dv_vlc;
        uint16_t new_dv_vlc_bits[NB_DV_VLC*2];
        uint8_t  new_dv_vlc_len[NB_DV_VLC*2];
        uint8_t  new_dv_vlc_run[NB_DV_VLC*2];
        int16_t  new_dv_vlc_level[NB_DV_VLC*2];

        done = 1;

        /* it's faster to include sign bit in a generic VLC parsing scheme */
        for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
            new_dv_vlc_bits[j]  = dv_vlc_bits[i];
            new_dv_vlc_len[j]   = dv_vlc_len[i];
            new_dv_vlc_run[j]   = dv_vlc_run[i];
            new_dv_vlc_level[j] = dv_vlc_level[i];

            if (dv_vlc_level[i]) {
                new_dv_vlc_bits[j] <<= 1;
                new_dv_vlc_len[j]++;

                j++;
                new_dv_vlc_bits[j]  = (dv_vlc_bits[i] << 1) | 1;
                new_dv_vlc_len[j]   =  dv_vlc_len[i] + 1;
                new_dv_vlc_run[j]   =  dv_vlc_run[i];
                new_dv_vlc_level[j] = -dv_vlc_level[i];
            }
        }

        /* NOTE: as a trick, we use the fact the no codes are unused
           to accelerate the parsing of partial codes */
        init_vlc(&dv_vlc, TEX_VLC_BITS, j,
                 new_dv_vlc_len, 1, 1, new_dv_vlc_bits, 2, 2, 0);
        assert(dv_vlc.table_size == 1184);

        for (i = 0; i < dv_vlc.table_size; i++){
            int code = dv_vlc.table[i][0];
            int len  = dv_vlc.table[i][1];
            int level, run;

            if (len < 0){ //more bits needed
                run   = 0;
                level = code;
            } else {
                run   = new_dv_vlc_run  [code] + 1;
                level = new_dv_vlc_level[code];
            }
            dv_rl_vlc[i].len   = len;
            dv_rl_vlc[i].level = level;
            dv_rl_vlc[i].run   = run;
        }
        free_vlc(&dv_vlc);

        dv_vlc_map_tableinit();
    }

    /* Generic DSP setup */
    dsputil_init(&dsp, avctx);
    ff_set_cmp(&dsp, dsp.ildct_cmp, avctx->ildct_cmp);
    s->get_pixels = dsp.get_pixels;
    s->ildct_cmp = dsp.ildct_cmp[5];

    /* 88DCT setup */
    s->fdct[0]     = dsp.fdct;
    s->idct_put[0] = dsp.idct_put;
    for (i = 0; i < 64; i++)
       s->dv_zigzag[0][i] = dsp.idct_permutation[ff_zigzag_direct[i]];

    /* 248DCT setup */
    s->fdct[1]     = dsp.fdct248;
    s->idct_put[1] = ff_simple_idct248_put;  // FIXME: need to add it to DSP
    if (avctx->lowres){
        for (i = 0; i < 64; i++){
            int j = ff_zigzag248_direct[i];
            s->dv_zigzag[1][i] = dsp.idct_permutation[(j & 7) + (j & 8) * 4 + (j & 48) / 2];
        }
    }else
        memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);

    avctx->coded_frame = &s->picture;
    s->avctx = avctx;
    avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT;

    return 0;
}

static av_cold int dvvideo_init_encoder(AVCodecContext *avctx)
{
    if (!avpriv_dv_codec_profile(avctx)) {
        av_log(avctx, AV_LOG_ERROR, "Found no DV profile for %ix%i %s video\n",
               avctx->width, avctx->height, av_get_pix_fmt_name(avctx->pix_fmt));
        return -1;
    }

    return dvvideo_init(avctx);
}

typedef struct BlockInfo {
    const uint32_t *factor_table;
    const uint8_t *scan_table;
    uint8_t pos; /* position in block */
    void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
    uint8_t partial_bit_count;
    uint16_t partial_bit_buffer;
    int shift_offset;
} BlockInfo;

/* bit budget for AC only in 5 MBs */
static const int vs_total_ac_bits = (100 * 4 + 68*2) * 5;
static const int mb_area_start[5] = { 1, 6, 21, 43, 64 };

static inline int put_bits_left(PutBitContext* s)
{
    return (s->buf_end - s->buf) * 8 - put_bits_count(s);
}

/* decode AC coefficients */
static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block)
{
    int last_index = gb->size_in_bits;
    const uint8_t  *scan_table   = mb->scan_table;
    const uint32_t *factor_table = mb->factor_table;
    int pos               = mb->pos;
    int partial_bit_count = mb->partial_bit_count;
    int level, run, vlc_len, index;

    OPEN_READER(re, gb);
    UPDATE_CACHE(re, gb);

    /* if we must parse a partial VLC, we do it here */
    if (partial_bit_count > 0) {
        re_cache = ((unsigned)re_cache >> partial_bit_count) |
                   (mb->partial_bit_buffer << (sizeof(re_cache) * 8 - partial_bit_count));
        re_index -= partial_bit_count;
        mb->partial_bit_count = 0;
    }

    /* get the AC coefficients until last_index is reached */
    for (;;) {
        av_dlog(NULL, "%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16),
                re_index);
        /* our own optimized GET_RL_VLC */
        index   = NEG_USR32(re_cache, TEX_VLC_BITS);
        vlc_len = dv_rl_vlc[index].len;
        if (vlc_len < 0) {
            index = NEG_USR32((unsigned)re_cache << TEX_VLC_BITS, -vlc_len) + dv_rl_vlc[index].level;
            vlc_len = TEX_VLC_BITS - vlc_len;
        }
        level = dv_rl_vlc[index].level;
        run   = dv_rl_vlc[index].run;

        /* gotta check if we're still within gb boundaries */
        if (re_index + vlc_len > last_index) {
            /* should be < 16 bits otherwise a codeword could have been parsed */
            mb->partial_bit_count = last_index - re_index;
            mb->partial_bit_buffer = NEG_USR32(re_cache, mb->partial_bit_count);
            re_index = last_index;
            break;
        }
        re_index += vlc_len;

        av_dlog(NULL, "run=%d level=%d\n", run, level);
        pos += run;
        if (pos >= 64)
            break;

        level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >> dv_iweight_bits;
        block[scan_table[pos]] = level;

        UPDATE_CACHE(re, gb);
    }
    CLOSE_READER(re, gb);
    mb->pos = pos;
}

static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
{
    int bits_left = get_bits_left(gb);
    while (bits_left >= MIN_CACHE_BITS) {
        put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS));
        bits_left -= MIN_CACHE_BITS;
    }
    if (bits_left > 0) {
        put_bits(pb, bits_left, get_bits(gb, bits_left));
    }
}

static inline void dv_calculate_mb_xy(DVVideoContext *s, DVwork_chunk *work_chunk, int m, int *mb_x, int *mb_y)
{
     *mb_x = work_chunk->mb_coordinates[m] & 0xff;
     *mb_y = work_chunk->mb_coordinates[m] >> 8;

     /* We work with 720p frames split in half. The odd half-frame (chan==2,3) is displaced :-( */
     if (s->sys->height == 720 && !(s->buf[1]&0x0C)) {
         *mb_y -= (*mb_y>17)?18:-72; /* shifting the Y coordinate down by 72/2 macro blocks */
     }
}

/* mb_x and mb_y are in units of 8 pixels */
static int dv_decode_video_segment(AVCodecContext *avctx, void *arg)
{
    DVVideoContext *s = avctx->priv_data;
    DVwork_chunk *work_chunk = arg;
    int quant, dc, dct_mode, class1, j;
    int mb_index, mb_x, mb_y, last_index;
    int y_stride, linesize;
    DCTELEM *block, *block1;
    int c_offset;
    uint8_t *y_ptr;
    const uint8_t *buf_ptr;
    PutBitContext pb, vs_pb;
    GetBitContext gb;
    BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1;
    LOCAL_ALIGNED_16(DCTELEM, sblock, [5*DV_MAX_BPM], [64]);
    LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [  80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
    LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [5*80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */
    const int log2_blocksize = 3-s->avctx->lowres;
    int is_field_mode[5];

    assert((((int)mb_bit_buffer) & 7) == 0);
    assert((((int)vs_bit_buffer) & 7) == 0);

    memset(sblock, 0, 5*DV_MAX_BPM*sizeof(*sblock));

    /* pass 1: read DC and AC coefficients in blocks */
    buf_ptr = &s->buf[work_chunk->buf_offset*80];
    block1  = &sblock[0][0];
    mb1     = mb_data;
    init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
    for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) {
        /* skip header */
        quant = buf_ptr[3] & 0x0f;
        buf_ptr += 4;
        init_put_bits(&pb, mb_bit_buffer, 80);
        mb    = mb1;
        block = block1;
        is_field_mode[mb_index] = 0;
        for (j = 0; j < s->sys->bpm; j++) {
            last_index = s->sys->block_sizes[j];
            init_get_bits(&gb, buf_ptr, last_index);

            /* get the DC */
            dc       = get_sbits(&gb, 9);
            dct_mode = get_bits1(&gb);
            class1   = get_bits(&gb, 2);
            if (DV_PROFILE_IS_HD(s->sys)) {
                mb->idct_put     = s->idct_put[0];
                mb->scan_table   = s->dv_zigzag[0];
                mb->factor_table = &s->sys->idct_factor[(j >= 4)*4*16*64 + class1*16*64 + quant*64];
                is_field_mode[mb_index] |= !j && dct_mode;
            } else {
                mb->idct_put     = s->idct_put[dct_mode && log2_blocksize == 3];
                mb->scan_table   = s->dv_zigzag[dct_mode];
                mb->factor_table = &s->sys->idct_factor[(class1 == 3)*2*22*64 + dct_mode*22*64 +
                                                        (quant + dv_quant_offset[class1])*64];
            }
            dc = dc << 2;
            /* convert to unsigned because 128 is not added in the
               standard IDCT */
            dc += 1024;
            block[0] = dc;
            buf_ptr += last_index >> 3;
            mb->pos               = 0;
            mb->partial_bit_count = 0;

            av_dlog(avctx, "MB block: %d, %d ", mb_index, j);
            dv_decode_ac(&gb, mb, block);

            /* write the remaining bits in a new buffer only if the
               block is finished */
            if (mb->pos >= 64)
                bit_copy(&pb, &gb);

            block += 64;
            mb++;
        }

        /* pass 2: we can do it just after */
        av_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index);
        block = block1;
        mb    = mb1;
        init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
        put_bits32(&pb, 0); // padding must be zeroed
        flush_put_bits(&pb);
        for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) {
            if (mb->pos < 64 && get_bits_left(&gb) > 0) {
                dv_decode_ac(&gb, mb, block);
                /* if still not finished, no need to parse other blocks */
                if (mb->pos < 64)
                    break;
            }
        }
        /* all blocks are finished, so the extra bytes can be used at
           the video segment level */
        if (j >= s->sys->bpm)
            bit_copy(&vs_pb, &gb);
    }

    /* we need a pass over the whole video segment */
    av_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb));
    block = &sblock[0][0];
    mb    = mb_data;
    init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
    put_bits32(&vs_pb, 0); // padding must be zeroed
    flush_put_bits(&vs_pb);
    for (mb_index = 0; mb_index < 5; mb_index++) {
        for (j = 0; j < s->sys->bpm; j++) {
            if (mb->pos < 64) {
                av_dlog(avctx, "start %d:%d\n", mb_index, j);
                dv_decode_ac(&gb, mb, block);
            }
            if (mb->pos >= 64 && mb->pos < 127)
                av_log(avctx, AV_LOG_ERROR, "AC EOB marker is absent pos=%d\n", mb->pos);
            block += 64;
            mb++;
        }
    }

    /* compute idct and place blocks */
    block = &sblock[0][0];
    mb    = mb_data;
    for (mb_index = 0; mb_index < 5; mb_index++) {
        dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);

        /* idct_put'ting luminance */
        if ((s->sys->pix_fmt == PIX_FMT_YUV420P) ||
            (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
            (s->sys->height >= 720 && mb_y != 134)) {
            y_stride = (s->picture.linesize[0] << ((!is_field_mode[mb_index]) * log2_blocksize));
        } else {
            y_stride = (2 << log2_blocksize);
        }
        y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << log2_blocksize);
        linesize = s->picture.linesize[0] << is_field_mode[mb_index];
        mb[0]    .idct_put(y_ptr                                   , linesize, block + 0*64);
        if (s->sys->video_stype == 4) { /* SD 422 */
            mb[2].idct_put(y_ptr + (1 << log2_blocksize)           , linesize, block + 2*64);
        } else {
            mb[1].idct_put(y_ptr + (1 << log2_blocksize)           , linesize, block + 1*64);
            mb[2].idct_put(y_ptr                         + y_stride, linesize, block + 2*64);
            mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3*64);
        }
        mb += 4;
        block += 4*64;

        /* idct_put'ting chrominance */
        c_offset = (((mb_y >>  (s->sys->pix_fmt == PIX_FMT_YUV420P)) * s->picture.linesize[1] +
                     (mb_x >> ((s->sys->pix_fmt == PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize);
        for (j = 2; j; j--) {
            uint8_t *c_ptr = s->picture.data[j] + c_offset;
            if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
                  uint64_t aligned_pixels[64/8];
                  uint8_t *pixels = (uint8_t*)aligned_pixels;
                  uint8_t *c_ptr1, *ptr1;
                  int x, y;
                  mb->idct_put(pixels, 8, block);
                  for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->picture.linesize[j], pixels += 8) {
                      ptr1   = pixels + (1 << (log2_blocksize - 1));
                      c_ptr1 = c_ptr + (s->picture.linesize[j] << log2_blocksize);
                      for (x = 0; x < (1 << (log2_blocksize - 1)); x++) {
                          c_ptr[x]  = pixels[x];
                          c_ptr1[x] = ptr1[x];
                      }
                  }
                  block += 64; mb++;
            } else {
                  y_stride = (mb_y == 134) ? (1 << log2_blocksize) :
                                             s->picture.linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize);
                  linesize = s->picture.linesize[j] << is_field_mode[mb_index];
                  (mb++)->    idct_put(c_ptr           , linesize, block); block += 64;
                  if (s->sys->bpm == 8) {
                      (mb++)->idct_put(c_ptr + y_stride, linesize, block); block += 64;
                  }
            }
        }
    }
    return 0;
}

#if CONFIG_SMALL
/* Converts run and level (where level != 0) pair into VLC, returning bit size */
static av_always_inline int dv_rl2vlc(int run, int level, int sign, uint32_t* vlc)
{
    int size;
    if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
        *vlc = dv_vlc_map[run][level].vlc | sign;
        size = dv_vlc_map[run][level].size;
    }
    else {
        if (level < DV_VLC_MAP_LEV_SIZE) {
            *vlc = dv_vlc_map[0][level].vlc | sign;
            size = dv_vlc_map[0][level].size;
        } else {
            *vlc = 0xfe00 | (level << 1) | sign;
            size = 16;
        }
        if (run) {
            *vlc |= ((run < 16) ? dv_vlc_map[run-1][0].vlc :
                                  (0x1f80 | (run - 1))) << size;
            size +=  (run < 16) ? dv_vlc_map[run-1][0].size : 13;
        }
    }

    return size;
}

static av_always_inline int dv_rl2vlc_size(int run, int level)
{
    int size;

    if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
        size = dv_vlc_map[run][level].size;
    }
    else {
        size = (level < DV_VLC_MAP_LEV_SIZE) ? dv_vlc_map[0][level].size : 16;
        if (run) {
            size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;
        }
    }
    return size;
}
#else
static av_always_inline int dv_rl2vlc(int run, int l, int sign, uint32_t* vlc)
{
    *vlc = dv_vlc_map[run][l].vlc | sign;
    return dv_vlc_map[run][l].size;
}

static av_always_inline int dv_rl2vlc_size(int run, int l)
{
    return dv_vlc_map[run][l].size;
}
#endif

typedef struct EncBlockInfo {
    int      area_q[4];
    int      bit_size[4];
    int      prev[5];
    int      cur_ac;
    int      cno;
    int      dct_mode;
    DCTELEM  mb[64];
    uint8_t  next[64];
    uint8_t  sign[64];
    uint8_t  partial_bit_count;
    uint32_t partial_bit_buffer; /* we can't use uint16_t here */
} EncBlockInfo;

static av_always_inline PutBitContext* dv_encode_ac(EncBlockInfo* bi,
                                                    PutBitContext* pb_pool,
                                                    PutBitContext* pb_end)
{
    int prev, bits_left;
    PutBitContext* pb = pb_pool;
    int size = bi->partial_bit_count;
    uint32_t vlc = bi->partial_bit_buffer;

    bi->partial_bit_count = bi->partial_bit_buffer = 0;
    for (;;){
       /* Find suitable storage space */
       for (; size > (bits_left = put_bits_left(pb)); pb++) {
          if (bits_left) {
              size -= bits_left;
              put_bits(pb, bits_left, vlc >> size);
              vlc = vlc & ((1 << size) - 1);
          }
          if (pb + 1 >= pb_end) {
              bi->partial_bit_count  = size;
              bi->partial_bit_buffer = vlc;
              return pb;
          }
       }

       /* Store VLC */
       put_bits(pb, size, vlc);

       if (bi->cur_ac >= 64)
           break;

       /* Construct the next VLC */
       prev       = bi->cur_ac;
       bi->cur_ac = bi->next[prev];
       if (bi->cur_ac < 64){
           size = dv_rl2vlc(bi->cur_ac - prev - 1, bi->mb[bi->cur_ac], bi->sign[bi->cur_ac], &vlc);
       } else {
           size = 4; vlc = 6; /* End Of Block stamp */
       }
    }
    return pb;
}

static av_always_inline int dv_guess_dct_mode(DVVideoContext *s, uint8_t *data, int linesize) {
    if (s->avctx->flags & CODEC_FLAG_INTERLACED_DCT) {
        int ps = s->ildct_cmp(NULL, data, NULL, linesize, 8) - 400;
        if (ps > 0) {
            int is = s->ildct_cmp(NULL, data           , NULL, linesize<<1, 4) +
                     s->ildct_cmp(NULL, data + linesize, NULL, linesize<<1, 4);
            return (ps > is);
        }
    }

    return 0;
}

static av_always_inline int dv_init_enc_block(EncBlockInfo* bi, uint8_t *data, int linesize, DVVideoContext *s, int bias)
{
    const int *weight;
    const uint8_t* zigzag_scan;
    LOCAL_ALIGNED_16(DCTELEM, blk, [64]);
    int i, area;
    /* We offer two different methods for class number assignment: the
       method suggested in SMPTE 314M Table 22, and an improved
       method. The SMPTE method is very conservative; it assigns class
       3 (i.e. severe quantization) to any block where the largest AC
       component is greater than 36. FFmpeg's DV encoder tracks AC bit
       consumption precisely, so there is no need to bias most blocks
       towards strongly lossy compression. Instead, we assign class 2
       to most blocks, and use class 3 only when strictly necessary
       (for blocks whose largest AC component exceeds 255). */

#if 0 /* SMPTE spec method */
    static const int classes[] = {12, 24, 36, 0xffff};
#else /* improved FFmpeg method */
    static const int classes[] = {-1, -1, 255, 0xffff};
#endif
    int max  = classes[0];
    int prev = 0;

    assert((((int)blk) & 15) == 0);

    bi->area_q[0] = bi->area_q[1] = bi->area_q[2] = bi->area_q[3] = 0;
    bi->partial_bit_count = 0;
    bi->partial_bit_buffer = 0;
    bi->cur_ac = 0;
    if (data) {
        bi->dct_mode = dv_guess_dct_mode(s, data, linesize);
        s->get_pixels(blk, data, linesize);
        s->fdct[bi->dct_mode](blk);
    } else {
        /* We rely on the fact that encoding all zeros leads to an immediate EOB,
           which is precisely what the spec calls for in the "dummy" blocks. */
        memset(blk, 0, 64*sizeof(*blk));
        bi->dct_mode = 0;
    }
    bi->mb[0] = blk[0];

    zigzag_scan = bi->dct_mode ? ff_zigzag248_direct : ff_zigzag_direct;
    weight = bi->dct_mode ? dv_weight_248 : dv_weight_88;

    for (area = 0; area < 4; area++) {
       bi->prev[area]     = prev;
       bi->bit_size[area] = 1; // 4 areas 4 bits for EOB :)
       for (i = mb_area_start[area]; i < mb_area_start[area+1]; i++) {
          int level = blk[zigzag_scan[i]];

          if (level + 15 > 30U) {
              bi->sign[i] = (level >> 31) & 1;
              /* weight it and and shift down into range, adding for rounding */
              /* the extra division by a factor of 2^4 reverses the 8x expansion of the DCT
                 AND the 2x doubling of the weights */
              level = (FFABS(level) * weight[i] + (1 << (dv_weight_bits+3))) >> (dv_weight_bits+4);
              bi->mb[i] = level;
              if (level > max)
                  max = level;
              bi->bit_size[area] += dv_rl2vlc_size(i - prev  - 1, level);
              bi->next[prev]= i;
              prev = i;
          }
       }
    }
    bi->next[prev]= i;
    for (bi->cno = 0; max > classes[bi->cno]; bi->cno++);

    bi->cno += bias;

    if (bi->cno >= 3) {
        bi->cno = 3;
        prev    = 0;
        i       = bi->next[prev];
        for (area = 0; area < 4; area++) {
            bi->prev[area]     = prev;
            bi->bit_size[area] = 1; // 4 areas 4 bits for EOB :)
            for (; i < mb_area_start[area+1]; i = bi->next[i]) {
                bi->mb[i] >>= 1;

                if (bi->mb[i]) {
                    bi->bit_size[area] += dv_rl2vlc_size(i - prev - 1, bi->mb[i]);
                    bi->next[prev]= i;
                    prev = i;
                }
            }
        }
        bi->next[prev]= i;
    }

    return bi->bit_size[0] + bi->bit_size[1] + bi->bit_size[2] + bi->bit_size[3];
}

static inline void dv_guess_qnos(EncBlockInfo* blks, int* qnos)
{
    int size[5];
    int i, j, k, a, prev, a2;
    EncBlockInfo* b;

    size[0] = size[1] = size[2] = size[3] = size[4] = 1 << 24;
    do {
       b = blks;
       for (i = 0; i < 5; i++) {
          if (!qnos[i])
              continue;

          qnos[i]--;
          size[i] = 0;
          for (j = 0; j < 6; j++, b++) {
             for (a = 0; a < 4; a++) {
                if (b->area_q[a] != dv_quant_shifts[qnos[i] + dv_quant_offset[b->cno]][a]) {
                    b->bit_size[a] = 1; // 4 areas 4 bits for EOB :)
                    b->area_q[a]++;
                    prev = b->prev[a];
                    assert(b->next[prev] >= mb_area_start[a+1] || b->mb[prev]);
                    for (k = b->next[prev] ; k < mb_area_start[a+1]; k = b->next[k]) {
                       b->mb[k] >>= 1;
                       if (b->mb[k]) {
                           b->bit_size[a] += dv_rl2vlc_size(k - prev - 1, b->mb[k]);
                           prev = k;
                       } else {
                           if (b->next[k] >= mb_area_start[a+1] && b->next[k]<64){
                                for (a2 = a + 1; b->next[k] >= mb_area_start[a2+1]; a2++)
                                    b->prev[a2] = prev;
                                assert(a2 < 4);
                                assert(b->mb[b->next[k]]);
                                b->bit_size[a2] += dv_rl2vlc_size(b->next[k] - prev - 1, b->mb[b->next[k]])
                                                  -dv_rl2vlc_size(b->next[k] -    k - 1, b->mb[b->next[k]]);
                                assert(b->prev[a2] == k && (a2 + 1 >= 4 || b->prev[a2+1] != k));
                                b->prev[a2] = prev;
                           }
                           b->next[prev] = b->next[k];
                       }
                    }
                    b->prev[a+1]= prev;
                }
                size[i] += b->bit_size[a];
             }
          }
          if (vs_total_ac_bits >= size[0] + size[1] + size[2] + size[3] + size[4])
                return;
       }
    } while (qnos[0]|qnos[1]|qnos[2]|qnos[3]|qnos[4]);


    for (a = 2; a == 2 || vs_total_ac_bits < size[0]; a += a){
        b = blks;
        size[0] = 5 * 6 * 4; //EOB
        for (j = 0; j < 6 *5; j++, b++) {
            prev = b->prev[0];
            for (k = b->next[prev]; k < 64; k = b->next[k]) {
                if (b->mb[k] < a && b->mb[k] > -a){
                    b->next[prev] = b->next[k];
                }else{
                    size[0] += dv_rl2vlc_size(k - prev - 1, b->mb[k]);
                    prev = k;
                }
            }
        }
    }
}

static int dv_encode_video_segment(AVCodecContext *avctx, void *arg)
{
    DVVideoContext *s = avctx->priv_data;
    DVwork_chunk *work_chunk = arg;
    int mb_index, i, j;
    int mb_x, mb_y, c_offset, linesize, y_stride;
    uint8_t*  y_ptr;
    uint8_t*  dif;
    LOCAL_ALIGNED_8(uint8_t, scratch, [64]);
    EncBlockInfo  enc_blks[5*DV_MAX_BPM];
    PutBitContext pbs[5*DV_MAX_BPM];
    PutBitContext* pb;
    EncBlockInfo* enc_blk;
    int       vs_bit_size = 0;
    int       qnos[5] = {15, 15, 15, 15, 15}; /* No quantization */
    int*      qnosp = &qnos[0];

    dif = &s->buf[work_chunk->buf_offset*80];
    enc_blk = &enc_blks[0];
    for (mb_index = 0; mb_index < 5; mb_index++) {
        dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y);

        /* initializing luminance blocks */
        if ((s->sys->pix_fmt == PIX_FMT_YUV420P) ||
            (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
            (s->sys->height >= 720 && mb_y != 134)) {
            y_stride = s->picture.linesize[0] << 3;
        } else {
            y_stride = 16;
        }
        y_ptr    = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << 3);
        linesize = s->picture.linesize[0];

        if (s->sys->video_stype == 4) { /* SD 422 */
            vs_bit_size +=
            dv_init_enc_block(enc_blk+0, y_ptr               , linesize, s, 0) +
            dv_init_enc_block(enc_blk+1, NULL                , linesize, s, 0) +
            dv_init_enc_block(enc_blk+2, y_ptr + 8           , linesize, s, 0) +
            dv_init_enc_block(enc_blk+3, NULL                , linesize, s, 0);
        } else {
            vs_bit_size +=
            dv_init_enc_block(enc_blk+0, y_ptr               , linesize, s, 0) +
            dv_init_enc_block(enc_blk+1, y_ptr + 8           , linesize, s, 0) +
            dv_init_enc_block(enc_blk+2, y_ptr     + y_stride, linesize, s, 0) +
            dv_init_enc_block(enc_blk+3, y_ptr + 8 + y_stride, linesize, s, 0);
        }
        enc_blk += 4;

        /* initializing chrominance blocks */
        c_offset = (((mb_y >>  (s->sys->pix_fmt == PIX_FMT_YUV420P)) * s->picture.linesize[1] +
                     (mb_x >> ((s->sys->pix_fmt == PIX_FMT_YUV411P) ? 2 : 1))) << 3);
        for (j = 2; j; j--) {
            uint8_t *c_ptr = s->picture.data[j] + c_offset;
            linesize = s->picture.linesize[j];
            y_stride = (mb_y == 134) ? 8 : (s->picture.linesize[j] << 3);
            if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
                uint8_t* d;
                uint8_t* b = scratch;
                for (i = 0; i < 8; i++) {
                    d = c_ptr + (linesize << 3);
                    b[0] = c_ptr[0]; b[1] = c_ptr[1]; b[2] = c_ptr[2]; b[3] = c_ptr[3];
                    b[4] =     d[0]; b[5] =     d[1]; b[6] =     d[2]; b[7] =     d[3];
                    c_ptr += linesize;
                    b += 8;
                }
                c_ptr = scratch;
                linesize = 8;
            }

            vs_bit_size += dv_init_enc_block(    enc_blk++, c_ptr           , linesize, s, 1);
            if (s->sys->bpm == 8) {
                vs_bit_size += dv_init_enc_block(enc_blk++, c_ptr + y_stride, linesize, s, 1);
            }
        }
    }

    if (vs_total_ac_bits < vs_bit_size)
        dv_guess_qnos(&enc_blks[0], qnosp);

    /* DIF encoding process */
    for (j=0; j<5*s->sys->bpm;) {
        int start_mb = j;

        dif[3] = *qnosp++;
        dif += 4;

        /* First pass over individual cells only */
        for (i=0; i<s->sys->bpm; i++, j++) {
            int sz = s->sys->block_sizes[i]>>3;

            init_put_bits(&pbs[j], dif, sz);
            put_sbits(&pbs[j], 9, ((enc_blks[j].mb[0] >> 3) - 1024 + 2) >> 2);
            put_bits(&pbs[j], 1, enc_blks[j].dct_mode);
            put_bits(&pbs[j], 2, enc_blks[j].cno);

            dv_encode_ac(&enc_blks[j], &pbs[j], &pbs[j+1]);
            dif += sz;
        }

        /* Second pass over each MB space */
        pb = &pbs[start_mb];
        for (i=0; i<s->sys->bpm; i++) {
            if (enc_blks[start_mb+i].partial_bit_count)
                pb = dv_encode_ac(&enc_blks[start_mb+i], pb, &pbs[start_mb+s->sys->bpm]);
        }
    }

    /* Third and final pass over the whole video segment space */
    pb = &pbs[0];
    for (j=0; j<5*s->sys->bpm; j++) {
       if (enc_blks[j].partial_bit_count)
           pb = dv_encode_ac(&enc_blks[j], pb, &pbs[s->sys->bpm*5]);
       if (enc_blks[j].partial_bit_count)
            av_log(avctx, AV_LOG_ERROR, "ac bitstream overflow\n");
    }

    for (j=0; j<5*s->sys->bpm; j++) {
       int pos;
       int size = pbs[j].size_in_bits >> 3;
       flush_put_bits(&pbs[j]);
       pos = put_bits_count(&pbs[j]) >> 3;
       if (pos > size) {
           av_log(avctx, AV_LOG_ERROR, "bitstream written beyond buffer size\n");
           return -1;
       }
       memset(pbs[j].buf + pos, 0xff, size - pos);
    }

    return 0;
}

#if CONFIG_DVVIDEO_DECODER
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
   144000 bytes for PAL - or twice those for 50Mbps) */
static int dvvideo_decode_frame(AVCodecContext *avctx,
                                 void *data, int *data_size,
                                 AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    DVVideoContext *s = avctx->priv_data;
    const uint8_t* vsc_pack;
    int apt, is16_9;

    s->sys = avpriv_dv_frame_profile2(avctx, s->sys, buf, buf_size);
    if (!s->sys || buf_size < s->sys->frame_size || dv_init_dynamic_tables(s->sys)) {
        av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n");
        return -1; /* NOTE: we only accept several full frames */
    }

    if (s->picture.data[0])
        avctx->release_buffer(avctx, &s->picture);

    avcodec_get_frame_defaults(&s->picture);
    s->picture.reference = 0;
    s->picture.key_frame = 1;
    s->picture.pict_type = AV_PICTURE_TYPE_I;
    avctx->pix_fmt   = s->sys->pix_fmt;
    avctx->time_base = s->sys->time_base;
    avcodec_set_dimensions(avctx, s->sys->width, s->sys->height);
    if (avctx->get_buffer(avctx, &s->picture) < 0) {
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return -1;
    }
    s->picture.interlaced_frame = 1;
    s->picture.top_field_first  = 0;

    s->buf = buf;
    avctx->execute(avctx, dv_decode_video_segment, s->sys->work_chunks, NULL,
                   dv_work_pool_size(s->sys), sizeof(DVwork_chunk));

    emms_c();

    /* return image */
    *data_size = sizeof(AVFrame);
    *(AVFrame*)data = s->picture;

    /* Determine the codec's sample_aspect ratio from the packet */
    vsc_pack = buf + 80*5 + 48 + 5;
    if ( *vsc_pack == dv_video_control ) {
        apt = buf[4] & 0x07;
        is16_9 = (vsc_pack[2] & 0x07) == 0x02 || (!apt && (vsc_pack[2] & 0x07) == 0x07);
        avctx->sample_aspect_ratio = s->sys->sar[is16_9];
    }

    return s->sys->frame_size;
}
#endif /* CONFIG_DVVIDEO_DECODER */


static inline int dv_write_pack(enum dv_pack_type pack_id, DVVideoContext *c,
                                uint8_t* buf)
{
    /*
     * Here's what SMPTE314M says about these two:
     *    (page 6) APTn, AP1n, AP2n, AP3n: These data shall be identical
     *             as track application IDs (APTn = 001, AP1n =
     *             001, AP2n = 001, AP3n = 001), if the source signal
     *             comes from a digital VCR. If the signal source is
     *             unknown, all bits for these data shall be set to 1.
     *    (page 12) STYPE: STYPE defines a signal type of video signal
     *                     00000b = 4:1:1 compression
     *                     00100b = 4:2:2 compression
     *                     XXXXXX = Reserved
     * Now, I've got two problems with these statements:
     *   1. it looks like APT == 111b should be a safe bet, but it isn't.
     *      It seems that for PAL as defined in IEC 61834 we have to set
     *      APT to 000 and for SMPTE314M to 001.
     *   2. It is not at all clear what STYPE is used for 4:2:0 PAL
     *      compression scheme (if any).
     */
    int apt   = (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0 : 1);

    uint8_t aspect = 0;
    if ((int)(av_q2d(c->avctx->sample_aspect_ratio) * c->avctx->width / c->avctx->height * 10) >= 17) /* 16:9 */
        aspect = 0x02;

    buf[0] = (uint8_t)pack_id;
    switch (pack_id) {
    case dv_header525: /* I can't imagine why these two weren't defined as real */
    case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */
          buf[1] = 0xf8 |        /* reserved -- always 1 */
                   (apt & 0x07); /* APT: Track application ID */
          buf[2] = (0    << 7) | /* TF1: audio data is 0 - valid; 1 - invalid */
                   (0x0f << 3) | /* reserved -- always 1 */
                   (apt & 0x07); /* AP1: Audio application ID */
          buf[3] = (0    << 7) | /* TF2: video data is 0 - valid; 1 - invalid */
                   (0x0f << 3) | /* reserved -- always 1 */
                   (apt & 0x07); /* AP2: Video application ID */
          buf[4] = (0    << 7) | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */
                   (0x0f << 3) | /* reserved -- always 1 */
                   (apt & 0x07); /* AP3: Subcode application ID */
          break;
    case dv_video_source:
          buf[1] = 0xff;      /* reserved -- always 1 */
          buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
                   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
                   (3 << 4) | /* CLF: color frames ID (see ITU-R BT.470-4) */
                   0xf;       /* reserved -- always 1 */
          buf[3] = (3 << 6) | /* reserved -- always 1 */
                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
                   c->sys->video_stype; /* signal type video compression */
          buf[4] = 0xff;      /* VISC: 0xff -- no information */
          break;
    case dv_video_control:
          buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
                   0x3f;      /* reserved -- always 1 */
          buf[2] = 0xc8 |     /* reserved -- always b11001xxx */
                   aspect;
          buf[3] = (1 << 7) | /* frame/field flag 1 -- frame, 0 -- field */
                   (1 << 6) | /* first/second field flag 0 -- field 2, 1 -- field 1 */
                   (1 << 5) | /* frame change flag 0 -- same picture as before, 1 -- different */
                   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
                   0xc;       /* reserved -- always b1100 */
          buf[4] = 0xff;      /* reserved -- always 1 */
          break;
    default:
          buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
    }
    return 5;
}

#if CONFIG_DVVIDEO_ENCODER
static void dv_format_frame(DVVideoContext* c, uint8_t* buf)
{
    int chan, i, j, k;

    for (chan = 0; chan < c->sys->n_difchan; chan++) {
        for (i = 0; i < c->sys->difseg_size; i++) {
            memset(buf, 0xff, 80 * 6); /* first 6 DIF blocks are for control data */

            /* DV header: 1DIF */
            buf += dv_write_dif_id(dv_sect_header, chan, i, 0, buf);
            buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
            buf += 72; /* unused bytes */

            /* DV subcode: 2DIFs */
            for (j = 0; j < 2; j++) {
                buf += dv_write_dif_id(dv_sect_subcode, chan, i, j, buf);
                for (k = 0; k < 6; k++)
                     buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf) + 5;
                buf += 29; /* unused bytes */
            }

            /* DV VAUX: 3DIFS */
            for (j = 0; j < 3; j++) {
                buf += dv_write_dif_id(dv_sect_vaux, chan, i, j, buf);
                buf += dv_write_pack(dv_video_source,  c, buf);
                buf += dv_write_pack(dv_video_control, c, buf);
                buf += 7*5;
                buf += dv_write_pack(dv_video_source,  c, buf);
                buf += dv_write_pack(dv_video_control, c, buf);
                buf += 4*5 + 2; /* unused bytes */
            }

            /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
            for (j = 0; j < 135; j++) {
                if (j%15 == 0) {
                    memset(buf, 0xff, 80);
                    buf += dv_write_dif_id(dv_sect_audio, chan, i, j/15, buf);
                    buf += 77; /* audio control & shuffled PCM audio */
                }
                buf += dv_write_dif_id(dv_sect_video, chan, i, j, buf);
                buf += 77; /* 1 video macroblock: 1 bytes control
                              4 * 14 bytes Y 8x8 data
                              10 bytes Cr 8x8 data
                              10 bytes Cb 8x8 data */
            }
        }
    }
}


static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size,
                                void *data)
{
    DVVideoContext *s = c->priv_data;

    s->sys = avpriv_dv_codec_profile(c);
    if (!s->sys || buf_size < s->sys->frame_size || dv_init_dynamic_tables(s->sys))
        return -1;

    c->pix_fmt           = s->sys->pix_fmt;
    s->picture           = *((AVFrame *)data);
    s->picture.key_frame = 1;
    s->picture.pict_type = AV_PICTURE_TYPE_I;

    s->buf = buf;
    c->execute(c, dv_encode_video_segment, s->sys->work_chunks, NULL,
               dv_work_pool_size(s->sys), sizeof(DVwork_chunk));

    emms_c();

    dv_format_frame(s, buf);

    return s->sys->frame_size;
}
#endif

static int dvvideo_close(AVCodecContext *c)
{
    DVVideoContext *s = c->priv_data;

    if (s->picture.data[0])
        c->release_buffer(c, &s->picture);

    return 0;
}


#if CONFIG_DVVIDEO_ENCODER
AVCodec ff_dvvideo_encoder = {
    .name           = "dvvideo",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_DVVIDEO,
    .priv_data_size = sizeof(DVVideoContext),
    .init           = dvvideo_init_encoder,
    .encode         = dvvideo_encode_frame,
    .capabilities = CODEC_CAP_SLICE_THREADS,
    .pix_fmts  = (const enum PixelFormat[]) {PIX_FMT_YUV411P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, PIX_FMT_NONE},
    .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
};
#endif // CONFIG_DVVIDEO_ENCODER

#if CONFIG_DVVIDEO_DECODER
AVCodec ff_dvvideo_decoder = {
    .name           = "dvvideo",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_DVVIDEO,
    .priv_data_size = sizeof(DVVideoContext),
    .init           = dvvideo_init,
    .close          = dvvideo_close,
    .decode         = dvvideo_decode_frame,
    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,
    .max_lowres = 3,
    .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
};
#endif
OpenPOWER on IntegriCloud