GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/cbs.c Lines: 223 372 59.9 %
Date: 2019-11-18 18:00:01 Branches: 102 268 38.1 %

Line Branch Exec Source
1
/*
2
 * This file is part of FFmpeg.
3
 *
4
 * FFmpeg is free software; you can redistribute it and/or
5
 * modify it under the terms of the GNU Lesser General Public
6
 * License as published by the Free Software Foundation; either
7
 * version 2.1 of the License, or (at your option) any later version.
8
 *
9
 * FFmpeg is distributed in the hope that it will be useful,
10
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12
 * Lesser General Public License for more details.
13
 *
14
 * You should have received a copy of the GNU Lesser General Public
15
 * License along with FFmpeg; if not, write to the Free Software
16
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
 */
18
19
#include <string.h>
20
21
#include "config.h"
22
23
#include "libavutil/avassert.h"
24
#include "libavutil/buffer.h"
25
#include "libavutil/common.h"
26
27
#include "cbs.h"
28
#include "cbs_internal.h"
29
30
31
static const CodedBitstreamType *cbs_type_table[] = {
32
#if CONFIG_CBS_AV1
33
    &ff_cbs_type_av1,
34
#endif
35
#if CONFIG_CBS_H264
36
    &ff_cbs_type_h264,
37
#endif
38
#if CONFIG_CBS_H265
39
    &ff_cbs_type_h265,
40
#endif
41
#if CONFIG_CBS_JPEG
42
    &ff_cbs_type_jpeg,
43
#endif
44
#if CONFIG_CBS_MPEG2
45
    &ff_cbs_type_mpeg2,
46
#endif
47
#if CONFIG_CBS_VP9
48
    &ff_cbs_type_vp9,
49
#endif
50
};
51
52
const enum AVCodecID ff_cbs_all_codec_ids[] = {
53
#if CONFIG_CBS_AV1
54
    AV_CODEC_ID_AV1,
55
#endif
56
#if CONFIG_CBS_H264
57
    AV_CODEC_ID_H264,
58
#endif
59
#if CONFIG_CBS_H265
60
    AV_CODEC_ID_H265,
61
#endif
62
#if CONFIG_CBS_JPEG
63
    AV_CODEC_ID_MJPEG,
64
#endif
65
#if CONFIG_CBS_MPEG2
66
    AV_CODEC_ID_MPEG2VIDEO,
67
#endif
68
#if CONFIG_CBS_VP9
69
    AV_CODEC_ID_VP9,
70
#endif
71
    AV_CODEC_ID_NONE
72
};
73
74
52
int ff_cbs_init(CodedBitstreamContext **ctx_ptr,
75
                enum AVCodecID codec_id, void *log_ctx)
76
{
77
    CodedBitstreamContext *ctx;
78
    const CodedBitstreamType *type;
79
    int i;
80
81
52
    type = NULL;
82
189
    for (i = 0; i < FF_ARRAY_ELEMS(cbs_type_table); i++) {
83
189
        if (cbs_type_table[i]->codec_id == codec_id) {
84
52
            type = cbs_type_table[i];
85
52
            break;
86
        }
87
    }
88
52
    if (!type)
89
        return AVERROR(EINVAL);
90
91
52
    ctx = av_mallocz(sizeof(*ctx));
92
52
    if (!ctx)
93
        return AVERROR(ENOMEM);
94
95
52
    ctx->log_ctx = log_ctx;
96
52
    ctx->codec   = type;
97
98
52
    if (type->priv_data_size) {
99
52
        ctx->priv_data = av_mallocz(ctx->codec->priv_data_size);
100
52
        if (!ctx->priv_data) {
101
            av_freep(&ctx);
102
            return AVERROR(ENOMEM);
103
        }
104
    }
105
106
52
    ctx->decompose_unit_types = NULL;
107
108
52
    ctx->trace_enable = 0;
109
52
    ctx->trace_level  = AV_LOG_TRACE;
110
111
52
    *ctx_ptr = ctx;
112
52
    return 0;
113
}
114
115
52
void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
116
{
117
52
    CodedBitstreamContext *ctx = *ctx_ptr;
118
119
52
    if (!ctx)
120
        return;
121
122

52
    if (ctx->codec && ctx->codec->close)
123
35
        ctx->codec->close(ctx);
124
125
52
    av_freep(&ctx->write_buffer);
126
52
    av_freep(&ctx->priv_data);
127
52
    av_freep(ctx_ptr);
128
}
129
130
23488
static void cbs_unit_uninit(CodedBitstreamContext *ctx,
131
                            CodedBitstreamUnit *unit)
132
{
133
23488
    av_buffer_unref(&unit->content_ref);
134
23488
    unit->content = NULL;
135
136
23488
    av_buffer_unref(&unit->data_ref);
137
23488
    unit->data             = NULL;
138
23488
    unit->data_size        = 0;
139
23488
    unit->data_bit_padding = 0;
140
23488
}
141
142
4755
void ff_cbs_fragment_reset(CodedBitstreamContext *ctx,
143
                           CodedBitstreamFragment *frag)
144
{
145
    int i;
146
147
28243
    for (i = 0; i < frag->nb_units; i++)
148
23488
        cbs_unit_uninit(ctx, &frag->units[i]);
149
4755
    frag->nb_units = 0;
150
151
4755
    av_buffer_unref(&frag->data_ref);
152
4755
    frag->data             = NULL;
153
4755
    frag->data_size        = 0;
154
4755
    frag->data_bit_padding = 0;
155
4755
}
156
157
52
void ff_cbs_fragment_free(CodedBitstreamContext *ctx,
158
                          CodedBitstreamFragment *frag)
159
{
160
52
    ff_cbs_fragment_reset(ctx, frag);
161
162
52
    av_freep(&frag->units);
163
52
    frag->nb_units_allocated = 0;
164
52
}
165
166
4703
static int cbs_read_fragment_content(CodedBitstreamContext *ctx,
167
                                     CodedBitstreamFragment *frag)
168
{
169
    int err, i, j;
170
171
28191
    for (i = 0; i < frag->nb_units; i++) {
172
23488
        CodedBitstreamUnit *unit = &frag->units[i];
173
174
23488
        if (ctx->decompose_unit_types) {
175
            for (j = 0; j < ctx->nb_decompose_unit_types; j++) {
176
                if (ctx->decompose_unit_types[j] == unit->type)
177
                    break;
178
            }
179
            if (j >= ctx->nb_decompose_unit_types)
180
                continue;
181
        }
182
183
23488
        av_buffer_unref(&unit->content_ref);
184
23488
        unit->content = NULL;
185
186

23488
        av_assert0(unit->data && unit->data_ref);
187
188
23488
        err = ctx->codec->read_unit(ctx, unit);
189
23488
        if (err == AVERROR(ENOSYS)) {
190
            av_log(ctx->log_ctx, AV_LOG_VERBOSE,
191
                   "Decomposition unimplemented for unit %d "
192
                   "(type %"PRIu32").\n", i, unit->type);
193
23488
        } else if (err < 0) {
194
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to read unit %d "
195
                   "(type %"PRIu32").\n", i, unit->type);
196
            return err;
197
        }
198
    }
199
200
4703
    return 0;
201
}
202
203
38
static int cbs_fill_fragment_data(CodedBitstreamContext *ctx,
204
                                  CodedBitstreamFragment *frag,
205
                                  const uint8_t *data, size_t size)
206
{
207

38
    av_assert0(!frag->data && !frag->data_ref);
208
209
38
    frag->data_ref =
210
38
        av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
211
38
    if (!frag->data_ref)
212
        return AVERROR(ENOMEM);
213
214
38
    frag->data      = frag->data_ref->data;
215
38
    frag->data_size = size;
216
217
38
    memcpy(frag->data, data, size);
218
38
    memset(frag->data + size, 0,
219
           AV_INPUT_BUFFER_PADDING_SIZE);
220
221
38
    return 0;
222
}
223
224
38
int ff_cbs_read_extradata(CodedBitstreamContext *ctx,
225
                          CodedBitstreamFragment *frag,
226
                          const AVCodecParameters *par)
227
{
228
    int err;
229
230
38
    err = cbs_fill_fragment_data(ctx, frag, par->extradata,
231
38
                                 par->extradata_size);
232
38
    if (err < 0)
233
        return err;
234
235
38
    err = ctx->codec->split_fragment(ctx, frag, 1);
236
38
    if (err < 0)
237
        return err;
238
239
38
    return cbs_read_fragment_content(ctx, frag);
240
}
241
242
4665
int ff_cbs_read_packet(CodedBitstreamContext *ctx,
243
                       CodedBitstreamFragment *frag,
244
                       const AVPacket *pkt)
245
{
246
    int err;
247
248
4665
    if (pkt->buf) {
249
4665
        frag->data_ref = av_buffer_ref(pkt->buf);
250
4665
        if (!frag->data_ref)
251
            return AVERROR(ENOMEM);
252
253
4665
        frag->data      = pkt->data;
254
4665
        frag->data_size = pkt->size;
255
256
    } else {
257
        err = cbs_fill_fragment_data(ctx, frag, pkt->data, pkt->size);
258
        if (err < 0)
259
            return err;
260
    }
261
262
4665
    err = ctx->codec->split_fragment(ctx, frag, 0);
263
4665
    if (err < 0)
264
        return err;
265
266
4665
    return cbs_read_fragment_content(ctx, frag);
267
}
268
269
int ff_cbs_read(CodedBitstreamContext *ctx,
270
                CodedBitstreamFragment *frag,
271
                const uint8_t *data, size_t size)
272
{
273
    int err;
274
275
    err = cbs_fill_fragment_data(ctx, frag, data, size);
276
    if (err < 0)
277
        return err;
278
279
    err = ctx->codec->split_fragment(ctx, frag, 0);
280
    if (err < 0)
281
        return err;
282
283
    return cbs_read_fragment_content(ctx, frag);
284
}
285
286
23488
static int cbs_write_unit_data(CodedBitstreamContext *ctx,
287
                               CodedBitstreamUnit *unit)
288
{
289
    PutBitContext pbc;
290
    int ret;
291
292
23488
    if (!ctx->write_buffer) {
293
        // Initial write buffer size is 1MB.
294
52
        ctx->write_buffer_size = 1024 * 1024;
295
296
52
    reallocate_and_try_again:
297
52
        ret = av_reallocp(&ctx->write_buffer, ctx->write_buffer_size);
298
52
        if (ret < 0) {
299
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
300
                   "sufficiently large write buffer (last attempt "
301
                   "%"SIZE_SPECIFIER" bytes).\n", ctx->write_buffer_size);
302
            return ret;
303
        }
304
    }
305
306
23488
    init_put_bits(&pbc, ctx->write_buffer, ctx->write_buffer_size);
307
308
23488
    ret = ctx->codec->write_unit(ctx, unit, &pbc);
309
23488
    if (ret < 0) {
310
        if (ret == AVERROR(ENOSPC)) {
311
            // Overflow.
312
            if (ctx->write_buffer_size == INT_MAX / 8)
313
                return AVERROR(ENOMEM);
314
            ctx->write_buffer_size = FFMIN(2 * ctx->write_buffer_size, INT_MAX / 8);
315
            goto reallocate_and_try_again;
316
        }
317
        // Write failed for some other reason.
318
        return ret;
319
    }
320
321
    // Overflow but we didn't notice.
322
23488
    av_assert0(put_bits_count(&pbc) <= 8 * ctx->write_buffer_size);
323
324
23488
    if (put_bits_count(&pbc) % 8)
325
52
        unit->data_bit_padding = 8 - put_bits_count(&pbc) % 8;
326
    else
327
23436
        unit->data_bit_padding = 0;
328
329
23488
    flush_put_bits(&pbc);
330
331
23488
    ret = ff_cbs_alloc_unit_data(ctx, unit, put_bits_count(&pbc) / 8);
332
23488
    if (ret < 0)
333
        return ret;
334
335
23488
    memcpy(unit->data, ctx->write_buffer, unit->data_size);
336
337
23488
    return 0;
338
}
339
340
4703
int ff_cbs_write_fragment_data(CodedBitstreamContext *ctx,
341
                               CodedBitstreamFragment *frag)
342
{
343
    int err, i;
344
345
28191
    for (i = 0; i < frag->nb_units; i++) {
346
23488
        CodedBitstreamUnit *unit = &frag->units[i];
347
348
23488
        if (!unit->content)
349
            continue;
350
351
23488
        av_buffer_unref(&unit->data_ref);
352
23488
        unit->data = NULL;
353
354
23488
        err = cbs_write_unit_data(ctx, unit);
355
23488
        if (err < 0) {
356
            av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write unit %d "
357
                   "(type %"PRIu32").\n", i, unit->type);
358
            return err;
359
        }
360

23488
        av_assert0(unit->data && unit->data_ref);
361
    }
362
363
4703
    av_buffer_unref(&frag->data_ref);
364
4703
    frag->data = NULL;
365
366
4703
    err = ctx->codec->assemble_fragment(ctx, frag);
367
4703
    if (err < 0) {
368
        av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to assemble fragment.\n");
369
        return err;
370
    }
371

4703
    av_assert0(frag->data && frag->data_ref);
372
373
4703
    return 0;
374
}
375
376
38
int ff_cbs_write_extradata(CodedBitstreamContext *ctx,
377
                           AVCodecParameters *par,
378
                           CodedBitstreamFragment *frag)
379
{
380
    int err;
381
382
38
    err = ff_cbs_write_fragment_data(ctx, frag);
383
38
    if (err < 0)
384
        return err;
385
386
38
    av_freep(&par->extradata);
387
388
38
    par->extradata = av_malloc(frag->data_size +
389
                               AV_INPUT_BUFFER_PADDING_SIZE);
390
38
    if (!par->extradata)
391
        return AVERROR(ENOMEM);
392
393
38
    memcpy(par->extradata, frag->data, frag->data_size);
394
38
    memset(par->extradata + frag->data_size, 0,
395
           AV_INPUT_BUFFER_PADDING_SIZE);
396
38
    par->extradata_size = frag->data_size;
397
398
38
    return 0;
399
}
400
401
4665
int ff_cbs_write_packet(CodedBitstreamContext *ctx,
402
                        AVPacket *pkt,
403
                        CodedBitstreamFragment *frag)
404
{
405
    AVBufferRef *buf;
406
    int err;
407
408
4665
    err = ff_cbs_write_fragment_data(ctx, frag);
409
4665
    if (err < 0)
410
        return err;
411
412
4665
    buf = av_buffer_ref(frag->data_ref);
413
4665
    if (!buf)
414
        return AVERROR(ENOMEM);
415
416
4665
    av_buffer_unref(&pkt->buf);
417
418
4665
    pkt->buf  = buf;
419
4665
    pkt->data = frag->data;
420
4665
    pkt->size = frag->data_size;
421
422
4665
    return 0;
423
}
424
425
426
50774
void ff_cbs_trace_header(CodedBitstreamContext *ctx,
427
                         const char *name)
428
{
429
50774
    if (!ctx->trace_enable)
430
50774
        return;
431
432
    av_log(ctx->log_ctx, ctx->trace_level, "%s\n", name);
433
}
434
435
void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
436
                                 const char *str, const int *subscripts,
437
                                 const char *bits, int64_t value)
438
{
439
    char name[256];
440
    size_t name_len, bits_len;
441
    int pad, subs, i, j, k, n;
442
443
    if (!ctx->trace_enable)
444
        return;
445
446
    av_assert0(value >= INT_MIN && value <= UINT32_MAX);
447
448
    subs = subscripts ? subscripts[0] : 0;
449
    n = 0;
450
    for (i = j = 0; str[i];) {
451
        if (str[i] == '[') {
452
            if (n < subs) {
453
                ++n;
454
                k = snprintf(name + j, sizeof(name) - j, "[%d", subscripts[n]);
455
                av_assert0(k > 0 && j + k < sizeof(name));
456
                j += k;
457
                for (++i; str[i] && str[i] != ']'; i++);
458
                av_assert0(str[i] == ']');
459
            } else {
460
                while (str[i] && str[i] != ']')
461
                    name[j++] = str[i++];
462
                av_assert0(str[i] == ']');
463
            }
464
        } else {
465
            av_assert0(j + 1 < sizeof(name));
466
            name[j++] = str[i++];
467
        }
468
    }
469
    av_assert0(j + 1 < sizeof(name));
470
    name[j] = 0;
471
    av_assert0(n == subs);
472
473
    name_len = strlen(name);
474
    bits_len = strlen(bits);
475
476
    if (name_len + bits_len > 60)
477
        pad = bits_len + 2;
478
    else
479
        pad = 61 - name_len;
480
481
    av_log(ctx->log_ctx, ctx->trace_level, "%-10d  %s%*s = %"PRId64"\n",
482
           position, name, pad, bits, value);
483
}
484
485
360117
int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
486
                         int width, const char *name,
487
                         const int *subscripts, uint32_t *write_to,
488
                         uint32_t range_min, uint32_t range_max)
489
{
490
    uint32_t value;
491
    int position;
492
493

360117
    av_assert0(width > 0 && width <= 32);
494
495
360117
    if (get_bits_left(gbc) < width) {
496
        av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
497
               "%s: bitstream ended.\n", name);
498
        return AVERROR_INVALIDDATA;
499
    }
500
501
360117
    if (ctx->trace_enable)
502
        position = get_bits_count(gbc);
503
504
360117
    value = get_bits_long(gbc, width);
505
506
360117
    if (ctx->trace_enable) {
507
        char bits[33];
508
        int i;
509
        for (i = 0; i < width; i++)
510
            bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
511
        bits[i] = 0;
512
513
        ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
514
                                    bits, value);
515
    }
516
517

360117
    if (value < range_min || value > range_max) {
518
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
519
               "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
520
               name, value, range_min, range_max);
521
        return AVERROR_INVALIDDATA;
522
    }
523
524
360117
    *write_to = value;
525
360117
    return 0;
526
}
527
528
360123
int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
529
                          int width, const char *name,
530
                          const int *subscripts, uint32_t value,
531
                          uint32_t range_min, uint32_t range_max)
532
{
533

360123
    av_assert0(width > 0 && width <= 32);
534
535

360123
    if (value < range_min || value > range_max) {
536
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
537
               "%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
538
               name, value, range_min, range_max);
539
        return AVERROR_INVALIDDATA;
540
    }
541
542
360123
    if (put_bits_left(pbc) < width)
543
        return AVERROR(ENOSPC);
544
545
360123
    if (ctx->trace_enable) {
546
        char bits[33];
547
        int i;
548
        for (i = 0; i < width; i++)
549
            bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
550
        bits[i] = 0;
551
552
        ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
553
                                    name, subscripts, bits, value);
554
    }
555
556
360123
    if (width < 32)
557
359753
        put_bits(pbc, width, value);
558
    else
559
370
        put_bits32(pbc, value);
560
561
360123
    return 0;
562
}
563
564
50
int ff_cbs_read_signed(CodedBitstreamContext *ctx, GetBitContext *gbc,
565
                       int width, const char *name,
566
                       const int *subscripts, int32_t *write_to,
567
                       int32_t range_min, int32_t range_max)
568
{
569
    int32_t value;
570
    int position;
571
572

50
    av_assert0(width > 0 && width <= 32);
573
574
50
    if (get_bits_left(gbc) < width) {
575
        av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
576
               "%s: bitstream ended.\n", name);
577
        return AVERROR_INVALIDDATA;
578
    }
579
580
50
    if (ctx->trace_enable)
581
        position = get_bits_count(gbc);
582
583
50
    value = get_sbits_long(gbc, width);
584
585
50
    if (ctx->trace_enable) {
586
        char bits[33];
587
        int i;
588
        for (i = 0; i < width; i++)
589
            bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
590
        bits[i] = 0;
591
592
        ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
593
                                    bits, value);
594
    }
595
596

50
    if (value < range_min || value > range_max) {
597
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
598
               "%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
599
               name, value, range_min, range_max);
600
        return AVERROR_INVALIDDATA;
601
    }
602
603
50
    *write_to = value;
604
50
    return 0;
605
}
606
607
50
int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
608
                        int width, const char *name,
609
                        const int *subscripts, int32_t value,
610
                        int32_t range_min, int32_t range_max)
611
{
612

50
    av_assert0(width > 0 && width <= 32);
613
614

50
    if (value < range_min || value > range_max) {
615
        av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
616
               "%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
617
               name, value, range_min, range_max);
618
        return AVERROR_INVALIDDATA;
619
    }
620
621
50
    if (put_bits_left(pbc) < width)
622
        return AVERROR(ENOSPC);
623
624
50
    if (ctx->trace_enable) {
625
        char bits[33];
626
        int i;
627
        for (i = 0; i < width; i++)
628
            bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
629
        bits[i] = 0;
630
631
        ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
632
                                    name, subscripts, bits, value);
633
    }
634
635
50
    if (width < 32)
636
50
        put_sbits(pbc, width, value);
637
    else
638
        put_bits32(pbc, value);
639
640
50
    return 0;
641
}
642
643
644
23488
int ff_cbs_alloc_unit_content(CodedBitstreamContext *ctx,
645
                              CodedBitstreamUnit *unit,
646
                              size_t size,
647
                              void (*free)(void *opaque, uint8_t *data))
648
{
649

23488
    av_assert0(!unit->content && !unit->content_ref);
650
651
23488
    unit->content = av_mallocz(size);
652
23488
    if (!unit->content)
653
        return AVERROR(ENOMEM);
654
655
23488
    unit->content_ref = av_buffer_create(unit->content, size,
656
                                         free, NULL, 0);
657
23488
    if (!unit->content_ref) {
658
        av_freep(&unit->content);
659
        return AVERROR(ENOMEM);
660
    }
661
662
23488
    return 0;
663
}
664
665
23488
int ff_cbs_alloc_unit_data(CodedBitstreamContext *ctx,
666
                           CodedBitstreamUnit *unit,
667
                           size_t size)
668
{
669

23488
    av_assert0(!unit->data && !unit->data_ref);
670
671
23488
    unit->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
672
23488
    if (!unit->data_ref)
673
        return AVERROR(ENOMEM);
674
675
23488
    unit->data      = unit->data_ref->data;
676
23488
    unit->data_size = size;
677
678
23488
    memset(unit->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
679
680
23488
    return 0;
681
}
682
683
23488
static int cbs_insert_unit(CodedBitstreamContext *ctx,
684
                           CodedBitstreamFragment *frag,
685
                           int position)
686
{
687
    CodedBitstreamUnit *units;
688
689
23488
    if (frag->nb_units < frag->nb_units_allocated) {
690
21116
        units = frag->units;
691
692
21116
        if (position < frag->nb_units)
693
            memmove(units + position + 1, units + position,
694
                    (frag->nb_units - position) * sizeof(*units));
695
    } else {
696
2372
        units = av_malloc_array(frag->nb_units + 1, sizeof(*units));
697
2372
        if (!units)
698
            return AVERROR(ENOMEM);
699
700
2372
        ++frag->nb_units_allocated;
701
702
2372
        if (position > 0)
703
2320
            memcpy(units, frag->units, position * sizeof(*units));
704
705
2372
        if (position < frag->nb_units)
706
            memcpy(units + position + 1, frag->units + position,
707
                   (frag->nb_units - position) * sizeof(*units));
708
    }
709
710
23488
    memset(units + position, 0, sizeof(*units));
711
712
23488
    if (units != frag->units) {
713
2372
        av_free(frag->units);
714
2372
        frag->units = units;
715
    }
716
717
23488
    ++frag->nb_units;
718
719
23488
    return 0;
720
}
721
722
int ff_cbs_insert_unit_content(CodedBitstreamContext *ctx,
723
                               CodedBitstreamFragment *frag,
724
                               int position,
725
                               CodedBitstreamUnitType type,
726
                               void *content,
727
                               AVBufferRef *content_buf)
728
{
729
    CodedBitstreamUnit *unit;
730
    AVBufferRef *content_ref;
731
    int err;
732
733
    if (position == -1)
734
        position = frag->nb_units;
735
    av_assert0(position >= 0 && position <= frag->nb_units);
736
737
    if (content_buf) {
738
        content_ref = av_buffer_ref(content_buf);
739
        if (!content_ref)
740
            return AVERROR(ENOMEM);
741
    } else {
742
        content_ref = NULL;
743
    }
744
745
    err = cbs_insert_unit(ctx, frag, position);
746
    if (err < 0) {
747
        av_buffer_unref(&content_ref);
748
        return err;
749
    }
750
751
    unit = &frag->units[position];
752
    unit->type        = type;
753
    unit->content     = content;
754
    unit->content_ref = content_ref;
755
756
    return 0;
757
}
758
759
23488
int ff_cbs_insert_unit_data(CodedBitstreamContext *ctx,
760
                            CodedBitstreamFragment *frag,
761
                            int position,
762
                            CodedBitstreamUnitType type,
763
                            uint8_t *data, size_t data_size,
764
                            AVBufferRef *data_buf)
765
{
766
    CodedBitstreamUnit *unit;
767
    AVBufferRef *data_ref;
768
    int err;
769
770
23488
    if (position == -1)
771
14645
        position = frag->nb_units;
772

23488
    av_assert0(position >= 0 && position <= frag->nb_units);
773
774
23488
    if (data_buf)
775
23488
        data_ref = av_buffer_ref(data_buf);
776
    else
777
        data_ref = av_buffer_create(data, data_size, NULL, NULL, 0);
778
23488
    if (!data_ref)
779
        return AVERROR(ENOMEM);
780
781
23488
    err = cbs_insert_unit(ctx, frag, position);
782
23488
    if (err < 0) {
783
        av_buffer_unref(&data_ref);
784
        return err;
785
    }
786
787
23488
    unit = &frag->units[position];
788
23488
    unit->type      = type;
789
23488
    unit->data      = data;
790
23488
    unit->data_size = data_size;
791
23488
    unit->data_ref  = data_ref;
792
793
23488
    return 0;
794
}
795
796
void ff_cbs_delete_unit(CodedBitstreamContext *ctx,
797
                        CodedBitstreamFragment *frag,
798
                        int position)
799
{
800
    av_assert0(0 <= position && position < frag->nb_units
801
                             && "Unit to be deleted not in fragment.");
802
803
    cbs_unit_uninit(ctx, &frag->units[position]);
804
805
    --frag->nb_units;
806
807
    if (frag->nb_units > 0)
808
        memmove(frag->units + position,
809
                frag->units + position + 1,
810
                (frag->nb_units - position) * sizeof(*frag->units));
811
}