summaryrefslogtreecommitdiff
path: root/libavcodec/dnxhddec.c
blob: 40d41f9bf11e538846368643fbfd9cbe81190834 (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
/*
 * VC3/DNxHD decoder.
 * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
 * Copyright (c) 2011 MirriAd Ltd
 * Copyright (c) 2015 Christophe Gisquet
 *
 * 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>
 * Slice multithreading and MB interlaced support added by Christophe Gisquet
 *
 * 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
 */

#include "libavutil/imgutils.h"
#include "libavutil/timer.h"
#include "avcodec.h"
#include "blockdsp.h"
#define  UNCHECKED_BITSTREAM_READER 1
#include "get_bits.h"
#include "dnxhddata.h"
#include "idctdsp.h"
#include "internal.h"
#include "profiles.h"
#include "thread.h"

typedef struct RowContext {
    DECLARE_ALIGNED(16, int16_t, blocks)[12][64];
    int luma_scale[64];
    int chroma_scale[64];
    GetBitContext gb;
    int last_dc[3];
    int last_qscale;
    int errors;
    /** -1:not set yet  0:off=RGB  1:on=YUV  2:variable */
    int format;
} RowContext;

typedef struct DNXHDContext {
    AVCodecContext *avctx;
    RowContext *rows;
    BlockDSPContext bdsp;
    const uint8_t* buf;
    int buf_size;
    int64_t cid;                        ///< compression id
    unsigned int width, height;
    enum AVPixelFormat pix_fmt;
    unsigned int mb_width, mb_height;
    uint32_t mb_scan_index[512];
    int data_offset;                    // End of mb_scan_index, where macroblocks start
    int cur_field;                      ///< current interlaced field
    VLC ac_vlc, dc_vlc, run_vlc;
    IDCTDSPContext idsp;
    ScanTable scantable;
    const CIDEntry *cid_table;
    int bit_depth; // 8, 10, 12 or 0 if not initialized at all.
    int is_444;
    int mbaff;
    int act;
    int (*decode_dct_block)(const struct DNXHDContext *ctx,
                            RowContext *row, int n);
} DNXHDContext;

#define DNXHD_VLC_BITS 9
#define DNXHD_DC_VLC_BITS 7

static int dnxhd_decode_dct_block_8(const DNXHDContext *ctx,
                                    RowContext *row, int n);
static int dnxhd_decode_dct_block_10(const DNXHDContext *ctx,
                                     RowContext *row, int n);
static int dnxhd_decode_dct_block_10_444(const DNXHDContext *ctx,
                                         RowContext *row, int n);
static int dnxhd_decode_dct_block_12(const DNXHDContext *ctx,
                                     RowContext *row, int n);
static int dnxhd_decode_dct_block_12_444(const DNXHDContext *ctx,
                                         RowContext *row, int n);

static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
{
    DNXHDContext *ctx = avctx->priv_data;

    ctx->avctx = avctx;
    ctx->cid = -1;
    avctx->colorspace = AVCOL_SPC_BT709;

    avctx->coded_width  = FFALIGN(avctx->width,  16);
    avctx->coded_height = FFALIGN(avctx->height, 16);

    ctx->rows = av_mallocz_array(avctx->thread_count, sizeof(RowContext));
    if (!ctx->rows)
        return AVERROR(ENOMEM);

    return 0;
}

static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid, int bitdepth)
{
    if (cid != ctx->cid) {
        int index;

        if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
            av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %"PRIu32"\n", cid);
            return AVERROR(ENOSYS);
        }
        if (ff_dnxhd_cid_table[index].bit_depth != bitdepth &&
            ff_dnxhd_cid_table[index].bit_depth != DNXHD_VARIABLE) {
            av_log(ctx->avctx, AV_LOG_ERROR, "bit depth mismatches %d %d\n", ff_dnxhd_cid_table[index].bit_depth, bitdepth);
            return AVERROR_INVALIDDATA;
        }
        ctx->cid_table = &ff_dnxhd_cid_table[index];
        av_log(ctx->avctx, AV_LOG_VERBOSE, "Profile cid %"PRIu32".\n", cid);

        ff_free_vlc(&ctx->ac_vlc);
        ff_free_vlc(&ctx->dc_vlc);
        ff_free_vlc(&ctx->run_vlc);

        init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
                 ctx->cid_table->ac_bits, 1, 1,
                 ctx->cid_table->ac_codes, 2, 2, 0);
        init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, bitdepth > 8 ? 14 : 12,
                 ctx->cid_table->dc_bits, 1, 1,
                 ctx->cid_table->dc_codes, 1, 1, 0);
        init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
                 ctx->cid_table->run_bits, 1, 1,
                 ctx->cid_table->run_codes, 2, 2, 0);

        ctx->cid = cid;
    }
    return 0;
}

static av_cold int dnxhd_decode_init_thread_copy(AVCodecContext *avctx)
{
    DNXHDContext *ctx = avctx->priv_data;

    ctx->avctx = avctx;
    // make sure VLC tables will be loaded when cid is parsed
    ctx->cid = -1;

    ctx->rows = av_mallocz_array(avctx->thread_count, sizeof(RowContext));
    if (!ctx->rows)
        return AVERROR(ENOMEM);

    return 0;
}

static int dnxhd_get_profile(int cid)
{
    switch(cid) {
    case 1270:
        return FF_PROFILE_DNXHR_444;
    case 1271:
        return FF_PROFILE_DNXHR_HQX;
    case 1272:
        return FF_PROFILE_DNXHR_HQ;
    case 1273:
        return FF_PROFILE_DNXHR_SQ;
    case 1274:
        return FF_PROFILE_DNXHR_LB;
    }
    return FF_PROFILE_DNXHD;
}

static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
                               const uint8_t *buf, int buf_size,
                               int first_field)
{
    int i, cid, ret;
    int old_bit_depth = ctx->bit_depth, bitdepth;
    uint64_t header_prefix;
    if (buf_size < 0x280) {
        av_log(ctx->avctx, AV_LOG_ERROR,
               "buffer too small (%d < 640).\n", buf_size);
        return AVERROR_INVALIDDATA;
    }

    header_prefix = ff_dnxhd_parse_header_prefix(buf);
    if (header_prefix == 0) {
        av_log(ctx->avctx, AV_LOG_ERROR,
               "unknown header 0x%02X 0x%02X 0x%02X 0x%02X 0x%02X\n",
               buf[0], buf[1], buf[2], buf[3], buf[4]);
        return AVERROR_INVALIDDATA;
    }
    if (buf[5] & 2) { /* interlaced */
        ctx->cur_field = buf[5] & 1;
        frame->interlaced_frame = 1;
        frame->top_field_first  = first_field ^ ctx->cur_field;
        av_log(ctx->avctx, AV_LOG_DEBUG,
               "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
    } else {
        ctx->cur_field = 0;
    }
    ctx->mbaff = (buf[0x6] >> 5) & 1;

    ctx->height = AV_RB16(buf + 0x18);
    ctx->width  = AV_RB16(buf + 0x1a);

    switch(buf[0x21] >> 5) {
    case 1: bitdepth = 8; break;
    case 2: bitdepth = 10; break;
    case 3: bitdepth = 12; break;
    default:
        av_log(ctx->avctx, AV_LOG_ERROR,
               "Unknown bitdepth indicator (%d)\n", buf[0x21] >> 5);
        return AVERROR_INVALIDDATA;
    }

    cid = AV_RB32(buf + 0x28);

    ctx->avctx->profile = dnxhd_get_profile(cid);

    if ((ret = dnxhd_init_vlc(ctx, cid, bitdepth)) < 0)
        return ret;
    if (ctx->mbaff && ctx->cid_table->cid != 1260)
        av_log(ctx->avctx, AV_LOG_WARNING,
               "Adaptive MB interlace flag in an unsupported profile.\n");

    ctx->act = buf[0x2C] & 7;
    if (ctx->act && ctx->cid_table->cid != 1256 && ctx->cid_table->cid != 1270)
        av_log(ctx->avctx, AV_LOG_WARNING,
               "Adaptive color transform in an unsupported profile.\n");

    ctx->is_444 = (buf[0x2C] >> 6) & 1;
    if (ctx->is_444) {
        if (bitdepth == 8) {
            avpriv_request_sample(ctx->avctx, "4:4:4 8 bits");
            return AVERROR_INVALIDDATA;
        } else if (bitdepth == 10) {
            ctx->decode_dct_block = dnxhd_decode_dct_block_10_444;
            ctx->pix_fmt = ctx->act ? AV_PIX_FMT_YUV444P10
                                    : AV_PIX_FMT_GBRP10;
        } else {
            ctx->decode_dct_block = dnxhd_decode_dct_block_12_444;
            ctx->pix_fmt = ctx->act ? AV_PIX_FMT_YUV444P12
                                    : AV_PIX_FMT_GBRP12;
        }
    } else if (bitdepth == 12) {
        ctx->decode_dct_block = dnxhd_decode_dct_block_12;
        ctx->pix_fmt = AV_PIX_FMT_YUV422P12;
    } else if (bitdepth == 10) {
        if (ctx->avctx->profile == FF_PROFILE_DNXHR_HQX)
            ctx->decode_dct_block = dnxhd_decode_dct_block_10_444;
        else
            ctx->decode_dct_block = dnxhd_decode_dct_block_10;
        ctx->pix_fmt = AV_PIX_FMT_YUV422P10;
    } else {
        ctx->decode_dct_block = dnxhd_decode_dct_block_8;
        ctx->pix_fmt = AV_PIX_FMT_YUV422P;
    }

    ctx->avctx->bits_per_raw_sample = ctx->bit_depth = bitdepth;
    if (ctx->bit_depth != old_bit_depth) {
        ff_blockdsp_init(&ctx->bdsp, ctx->avctx);
        ff_idctdsp_init(&ctx->idsp, ctx->avctx);
        ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable,
                          ff_zigzag_direct);
    }

    // make sure profile size constraints are respected
    // DNx100 allows 1920->1440 and 1280->960 subsampling
    if (ctx->width != ctx->cid_table->width &&
        ctx->cid_table->width != DNXHD_VARIABLE) {
        av_reduce(&ctx->avctx->sample_aspect_ratio.num,
                  &ctx->avctx->sample_aspect_ratio.den,
                  ctx->width, ctx->cid_table->width, 255);
        ctx->width = ctx->cid_table->width;
    }

    if (buf_size < ctx->cid_table->coding_unit_size) {
        av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size (%d < %u).\n",
               buf_size, ctx->cid_table->coding_unit_size);
        return AVERROR_INVALIDDATA;
    }

    ctx->mb_width  = (ctx->width + 15)>> 4;
    ctx->mb_height = AV_RB16(buf + 0x16c);

    if ((ctx->height + 15) >> 4 == ctx->mb_height && frame->interlaced_frame)
        ctx->height <<= 1;

    av_log(ctx->avctx, AV_LOG_VERBOSE, "%dx%d, 4:%s %d bits, MBAFF=%d ACT=%d\n",
           ctx->width, ctx->height, ctx->is_444 ? "4:4" : "2:2",
           ctx->bit_depth, ctx->mbaff, ctx->act);

    // Newer format supports variable mb_scan_index sizes
    if (ctx->mb_height > 68 && ff_dnxhd_check_header_prefix_hr(header_prefix)) {
        ctx->data_offset = 0x170 + (ctx->mb_height << 2);
    } else {
        if (ctx->mb_height > 68 ||
            (ctx->mb_height << frame->interlaced_frame) > (ctx->height + 15) >> 4) {
            av_log(ctx->avctx, AV_LOG_ERROR,
                   "mb height too big: %d\n", ctx->mb_height);
            return AVERROR_INVALIDDATA;
        }
        ctx->data_offset = 0x280;
    }

    if (buf_size < ctx->data_offset) {
        av_log(ctx->avctx, AV_LOG_ERROR,
               "buffer too small (%d < %d).\n", buf_size, ctx->data_offset);
        return AVERROR_INVALIDDATA;
    }

    if (ctx->mb_height > FF_ARRAY_ELEMS(ctx->mb_scan_index)) {
        av_log(ctx->avctx, AV_LOG_ERROR,
               "mb_height too big (%d > %"SIZE_SPECIFIER").\n", ctx->mb_height, FF_ARRAY_ELEMS(ctx->mb_scan_index));
        return AVERROR_INVALIDDATA;
    }

    for (i = 0; i < ctx->mb_height; i++) {
        ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i << 2));
        ff_dlog(ctx->avctx, "mb scan index %d, pos %d: %"PRIu32"\n",
                i, 0x170 + (i << 2), ctx->mb_scan_index[i]);
        if (buf_size - ctx->data_offset < ctx->mb_scan_index[i]) {
            av_log(ctx->avctx, AV_LOG_ERROR,
                   "invalid mb scan index (%"PRIu32" vs %u).\n",
                   ctx->mb_scan_index[i], buf_size - ctx->data_offset);
            return AVERROR_INVALIDDATA;
        }
    }

    return 0;
}

static av_always_inline int dnxhd_decode_dct_block(const DNXHDContext *ctx,
                                                   RowContext *row,
                                                   int n,
                                                   int index_bits,
                                                   int level_bias,
                                                   int level_shift,
                                                   int dc_shift)
{
    int i, j, index1, index2, len, flags;
    int level, component, sign;
    const int *scale;
    const uint8_t *weight_matrix;
    const uint8_t *ac_info = ctx->cid_table->ac_info;
    int16_t *block = row->blocks[n];
    const int eob_index     = ctx->cid_table->eob_index;
    int ret = 0;
    OPEN_READER(bs, &row->gb);

    ctx->bdsp.clear_block(block);

    if (!ctx->is_444) {
        if (n & 2) {
            component     = 1 + (n & 1);
            scale = row->chroma_scale;
            weight_matrix = ctx->cid_table->chroma_weight;
        } else {
            component     = 0;
            scale = row->luma_scale;
            weight_matrix = ctx->cid_table->luma_weight;
        }
    } else {
        component = (n >> 1) % 3;
        if (component) {
            scale = row->chroma_scale;
            weight_matrix = ctx->cid_table->chroma_weight;
        } else {
            scale = row->luma_scale;
            weight_matrix = ctx->cid_table->luma_weight;
        }
    }

    UPDATE_CACHE(bs, &row->gb);
    GET_VLC(len, bs, &row->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
    if (len) {
        level = GET_CACHE(bs, &row->gb);
        LAST_SKIP_BITS(bs, &row->gb, len);
        sign  = ~level >> 31;
        level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
        row->last_dc[component] += level * (1 << dc_shift);
    }
    block[0] = row->last_dc[component];

    i = 0;

    UPDATE_CACHE(bs, &row->gb);
    GET_VLC(index1, bs, &row->gb, ctx->ac_vlc.table,
            DNXHD_VLC_BITS, 2);

    while (index1 != eob_index) {
        level = ac_info[2*index1+0];
        flags = ac_info[2*index1+1];

        sign = SHOW_SBITS(bs, &row->gb, 1);
        SKIP_BITS(bs, &row->gb, 1);

        if (flags & 1) {
            level += SHOW_UBITS(bs, &row->gb, index_bits) << 7;
            SKIP_BITS(bs, &row->gb, index_bits);
        }

        if (flags & 2) {
            UPDATE_CACHE(bs, &row->gb);
            GET_VLC(index2, bs, &row->gb, ctx->run_vlc.table,
                    DNXHD_VLC_BITS, 2);
            i += ctx->cid_table->run[index2];
        }

        if (++i > 63) {
            av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
            ret = -1;
            break;
        }

        j     = ctx->scantable.permutated[i];
        level *= scale[i];
        level += scale[i] >> 1;
        if (level_bias < 32 || weight_matrix[i] != level_bias)
            level += level_bias; // 1<<(level_shift-1)
        level >>= level_shift;

        block[j] = (level ^ sign) - sign;

        UPDATE_CACHE(bs, &row->gb);
        GET_VLC(index1, bs, &row->gb, ctx->ac_vlc.table,
                DNXHD_VLC_BITS, 2);
    }

    CLOSE_READER(bs, &row->gb);
    return ret;
}

static int dnxhd_decode_dct_block_8(const DNXHDContext *ctx,
                                    RowContext *row, int n)
{
    return dnxhd_decode_dct_block(ctx, row, n, 4, 32, 6, 0);
}

static int dnxhd_decode_dct_block_10(const DNXHDContext *ctx,
                                     RowContext *row, int n)
{
    return dnxhd_decode_dct_block(ctx, row, n, 6, 8, 4, 0);
}

static int dnxhd_decode_dct_block_10_444(const DNXHDContext *ctx,
                                         RowContext *row, int n)
{
    return dnxhd_decode_dct_block(ctx, row, n, 6, 32, 6, 0);
}

static int dnxhd_decode_dct_block_12(const DNXHDContext *ctx,
                                     RowContext *row, int n)
{
    return dnxhd_decode_dct_block(ctx, row, n, 6, 8, 4, 2);
}

static int dnxhd_decode_dct_block_12_444(const DNXHDContext *ctx,
                                         RowContext *row, int n)
{
    return dnxhd_decode_dct_block(ctx, row, n, 6, 32, 4, 2);
}

static int dnxhd_decode_macroblock(const DNXHDContext *ctx, RowContext *row,
                                   AVFrame *frame, int x, int y)
{
    int shift1 = ctx->bit_depth >= 10;
    int dct_linesize_luma   = frame->linesize[0];
    int dct_linesize_chroma = frame->linesize[1];
    uint8_t *dest_y, *dest_u, *dest_v;
    int dct_y_offset, dct_x_offset;
    int qscale, i, act;
    int interlaced_mb = 0;

    if (ctx->mbaff) {
        interlaced_mb = get_bits1(&row->gb);
        qscale = get_bits(&row->gb, 10);
    } else {
        qscale = get_bits(&row->gb, 11);
    }
    act = get_bits1(&row->gb);
    if (act) {
        if (!ctx->act) {
            static int act_warned;
            if (!act_warned) {
                act_warned = 1;
                av_log(ctx->avctx, AV_LOG_ERROR,
                       "ACT flag set, in violation of frame header.\n");
            }
        } else if (row->format == -1) {
            row->format = act;
        } else if (row->format != act) {
            row->format = 2; // Variable
        }
    }

    if (qscale != row->last_qscale) {
        for (i = 0; i < 64; i++) {
            row->luma_scale[i]   = qscale * ctx->cid_table->luma_weight[i];
            row->chroma_scale[i] = qscale * ctx->cid_table->chroma_weight[i];
        }
        row->last_qscale = qscale;
    }

    for (i = 0; i < 8 + 4 * ctx->is_444; i++) {
        if (ctx->decode_dct_block(ctx, row, i) < 0)
            return AVERROR_INVALIDDATA;
    }

    if (frame->interlaced_frame) {
        dct_linesize_luma   <<= 1;
        dct_linesize_chroma <<= 1;
    }

    dest_y = frame->data[0] + ((y * dct_linesize_luma)   << 4) + (x << (4 + shift1));
    dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1 + ctx->is_444));
    dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1 + ctx->is_444));

    if (frame->interlaced_frame && ctx->cur_field) {
        dest_y += frame->linesize[0];
        dest_u += frame->linesize[1];
        dest_v += frame->linesize[2];
    }
    if (interlaced_mb) {
        dct_linesize_luma   <<= 1;
        dct_linesize_chroma <<= 1;
    }

    dct_y_offset = interlaced_mb ? frame->linesize[0] : (dct_linesize_luma << 3);
    dct_x_offset = 8 << shift1;
    if (!ctx->is_444) {
        ctx->idsp.idct_put(dest_y,                               dct_linesize_luma, row->blocks[0]);
        ctx->idsp.idct_put(dest_y + dct_x_offset,                dct_linesize_luma, row->blocks[1]);
        ctx->idsp.idct_put(dest_y + dct_y_offset,                dct_linesize_luma, row->blocks[4]);
        ctx->idsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, row->blocks[5]);

        if (!(ctx->avctx->flags & AV_CODEC_FLAG_GRAY)) {
            dct_y_offset = interlaced_mb ? frame->linesize[1] : (dct_linesize_chroma << 3);
            ctx->idsp.idct_put(dest_u,                dct_linesize_chroma, row->blocks[2]);
            ctx->idsp.idct_put(dest_v,                dct_linesize_chroma, row->blocks[3]);
            ctx->idsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, row->blocks[6]);
            ctx->idsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, row->blocks[7]);
        }
    } else {
        ctx->idsp.idct_put(dest_y,                               dct_linesize_luma, row->blocks[0]);
        ctx->idsp.idct_put(dest_y + dct_x_offset,                dct_linesize_luma, row->blocks[1]);
        ctx->idsp.idct_put(dest_y + dct_y_offset,                dct_linesize_luma, row->blocks[6]);
        ctx->idsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, row->blocks[7]);

        if (!(ctx->avctx->flags & AV_CODEC_FLAG_GRAY)) {
            dct_y_offset = interlaced_mb ? frame->linesize[1] : (dct_linesize_chroma << 3);
            ctx->idsp.idct_put(dest_u,                               dct_linesize_chroma, row->blocks[2]);
            ctx->idsp.idct_put(dest_u + dct_x_offset,                dct_linesize_chroma, row->blocks[3]);
            ctx->idsp.idct_put(dest_u + dct_y_offset,                dct_linesize_chroma, row->blocks[8]);
            ctx->idsp.idct_put(dest_u + dct_y_offset + dct_x_offset, dct_linesize_chroma, row->blocks[9]);
            ctx->idsp.idct_put(dest_v,                               dct_linesize_chroma, row->blocks[4]);
            ctx->idsp.idct_put(dest_v + dct_x_offset,                dct_linesize_chroma, row->blocks[5]);
            ctx->idsp.idct_put(dest_v + dct_y_offset,                dct_linesize_chroma, row->blocks[10]);
            ctx->idsp.idct_put(dest_v + dct_y_offset + dct_x_offset, dct_linesize_chroma, row->blocks[11]);
        }
    }

    return 0;
}

static int dnxhd_decode_row(AVCodecContext *avctx, void *data,
                            int rownb, int threadnb)
{
    const DNXHDContext *ctx = avctx->priv_data;
    uint32_t offset = ctx->mb_scan_index[rownb];
    RowContext *row = ctx->rows + threadnb;
    int x;

    row->last_dc[0] =
    row->last_dc[1] =
    row->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
    init_get_bits(&row->gb, ctx->buf + offset, (ctx->buf_size - offset) << 3);
    for (x = 0; x < ctx->mb_width; x++) {
        //START_TIMER;
        int ret = dnxhd_decode_macroblock(ctx, row, data, x, rownb);
        if (ret < 0) {
            row->errors++;
            return ret;
        }
        //STOP_TIMER("decode macroblock");
    }

    return 0;
}

static int dnxhd_decode_frame(AVCodecContext *avctx, void *data,
                              int *got_frame, AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    DNXHDContext *ctx = avctx->priv_data;
    ThreadFrame frame = { .f = data };
    AVFrame *picture = data;
    int first_field = 1;
    int ret, i;

    ff_dlog(avctx, "frame size %d\n", buf_size);

    for (i = 0; i < avctx->thread_count; i++)
        ctx->rows[i].format = -1;

decode_coding_unit:
    if ((ret = dnxhd_decode_header(ctx, picture, buf, buf_size, first_field)) < 0)
        return ret;

    if ((avctx->width || avctx->height) &&
        (ctx->width != avctx->width || ctx->height != avctx->height)) {
        av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %ux%u\n",
               avctx->width, avctx->height, ctx->width, ctx->height);
        first_field = 1;
    }
    if (avctx->pix_fmt != AV_PIX_FMT_NONE && avctx->pix_fmt != ctx->pix_fmt) {
        av_log(avctx, AV_LOG_WARNING, "pix_fmt changed: %s -> %s\n",
               av_get_pix_fmt_name(avctx->pix_fmt), av_get_pix_fmt_name(ctx->pix_fmt));
        first_field = 1;
    }

    avctx->pix_fmt = ctx->pix_fmt;
    ret = ff_set_dimensions(avctx, ctx->width, ctx->height);
    if (ret < 0)
        return ret;

    if (first_field) {
        if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
            return ret;
        picture->pict_type = AV_PICTURE_TYPE_I;
        picture->key_frame = 1;
    }

    ctx->buf_size = buf_size - ctx->data_offset;
    ctx->buf = buf + ctx->data_offset;
    avctx->execute2(avctx, dnxhd_decode_row, picture, NULL, ctx->mb_height);

    if (first_field && picture->interlaced_frame) {
        buf      += ctx->cid_table->coding_unit_size;
        buf_size -= ctx->cid_table->coding_unit_size;
        first_field = 0;
        goto decode_coding_unit;
    }

    ret = 0;
    for (i = 0; i < avctx->thread_count; i++) {
        ret += ctx->rows[i].errors;
        ctx->rows[i].errors = 0;
    }

    if (ctx->act) {
        static int act_warned;
        int format = ctx->rows[0].format;
        for (i = 1; i < avctx->thread_count; i++) {
            if (ctx->rows[i].format != format &&
                ctx->rows[i].format != -1 /* not run */) {
                format = 2;
                break;
            }
        }
        switch (format) {
        case -1:
        case 2:
            if (!act_warned) {
                act_warned = 1;
                av_log(ctx->avctx, AV_LOG_ERROR,
                       "Unsupported: variable ACT flag.\n");
            }
            break;
        case 0:
            ctx->pix_fmt = ctx->bit_depth==10
                         ? AV_PIX_FMT_GBRP10 : AV_PIX_FMT_GBRP12;
            break;
        case 1:
            ctx->pix_fmt = ctx->bit_depth==10
                         ? AV_PIX_FMT_YUV444P10 : AV_PIX_FMT_YUV444P12;
            break;
        }
    }
    avctx->pix_fmt = ctx->pix_fmt;
    if (ret) {
        av_log(ctx->avctx, AV_LOG_ERROR, "%d lines with errors\n", ret);
        return AVERROR_INVALIDDATA;
    }

    *got_frame = 1;
    return avpkt->size;
}

static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
{
    DNXHDContext *ctx = avctx->priv_data;

    ff_free_vlc(&ctx->ac_vlc);
    ff_free_vlc(&ctx->dc_vlc);
    ff_free_vlc(&ctx->run_vlc);

    av_freep(&ctx->rows);

    return 0;
}

AVCodec ff_dnxhd_decoder = {
    .name           = "dnxhd",
    .long_name      = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_DNXHD,
    .priv_data_size = sizeof(DNXHDContext),
    .init           = dnxhd_decode_init,
    .close          = dnxhd_decode_close,
    .decode         = dnxhd_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
                      AV_CODEC_CAP_SLICE_THREADS,
    .init_thread_copy = ONLY_IF_THREADS_ENABLED(dnxhd_decode_init_thread_copy),
    .profiles       = NULL_IF_CONFIG_SMALL(ff_dnxhd_profiles),
};