GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h264_sei.c Lines: 212 318 66.7 %
Date: 2020-07-11 02:49:52 Branches: 94 176 53.4 %

Line Branch Exec Source
1
/*
2
 * H.26L/H.264/AVC/JVT/14496-10/... SEI decoding
3
 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
22
/**
23
 * @file
24
 * H.264 / AVC / MPEG-4 part10 SEI decoding.
25
 * @author Michael Niedermayer <michaelni@gmx.at>
26
 */
27
28
#include "avcodec.h"
29
#include "get_bits.h"
30
#include "golomb.h"
31
#include "h264_ps.h"
32
#include "h264_sei.h"
33
#include "internal.h"
34
35
#define AVERROR_PS_NOT_FOUND      FFERRTAG(0xF8,'?','P','S')
36
37
static const uint8_t sei_num_clock_ts_table[9] = {
38
    1, 1, 1, 2, 2, 3, 3, 2, 3
39
};
40
41
50802
void ff_h264_sei_uninit(H264SEIContext *h)
42
{
43
50802
    h->recovery_point.recovery_frame_cnt = -1;
44
45
50802
    h->picture_timing.dpb_output_delay  = 0;
46
50802
    h->picture_timing.cpb_removal_delay = -1;
47
48
50802
    h->picture_timing.present      = 0;
49
50802
    h->buffering_period.present    = 0;
50
50802
    h->frame_packing.present       = 0;
51
50802
    h->display_orientation.present = 0;
52
50802
    h->afd.present                 =  0;
53
54
50802
    av_buffer_unref(&h->a53_caption.buf_ref);
55
50881
    for (int i = 0; i < h->unregistered.nb_buf_ref; i++)
56
79
        av_buffer_unref(&h->unregistered.buf_ref[i]);
57
50802
    h->unregistered.nb_buf_ref = 0;
58
50802
    av_freep(&h->unregistered.buf_ref);
59
50802
}
60
61
2766
int ff_h264_sei_process_picture_timing(H264SEIPictureTiming *h, const SPS *sps,
62
                                       void *logctx)
63
{
64
    GetBitContext gb;
65
66
2766
    init_get_bits(&gb, h->payload, h->payload_size_bits);
67
68
2766
    if (sps->nal_hrd_parameters_present_flag ||
69
1485
        sps->vcl_hrd_parameters_present_flag) {
70
1281
        h->cpb_removal_delay = get_bits_long(&gb, sps->cpb_removal_delay_length);
71
1281
        h->dpb_output_delay  = get_bits_long(&gb, sps->dpb_output_delay_length);
72
    }
73
2766
    if (sps->pic_struct_present_flag) {
74
        unsigned int i, num_clock_ts;
75
76
2746
        h->pic_struct = get_bits(&gb, 4);
77
2746
        h->ct_type    = 0;
78
79
2746
        if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
80
            return AVERROR_INVALIDDATA;
81
82
2746
        num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
83
2746
        h->timecode_cnt = 0;
84
7446
        for (i = 0; i < num_clock_ts; i++) {
85
4700
            if (get_bits(&gb, 1)) {                      /* clock_timestamp_flag */
86
1552
                H264SEITimeCode *tc = &h->timecode[h->timecode_cnt++];
87
                unsigned int full_timestamp_flag;
88
                unsigned int counting_type, cnt_dropped_flag;
89
1552
                h->ct_type |= 1 << get_bits(&gb, 2);
90
1552
                skip_bits(&gb, 1);                       /* nuit_field_based_flag */
91
1552
                counting_type = get_bits(&gb, 5);        /* counting_type */
92
1552
                full_timestamp_flag = get_bits(&gb, 1);
93
1552
                skip_bits(&gb, 1);                       /* discontinuity_flag */
94
1552
                cnt_dropped_flag = get_bits(&gb, 1);      /* cnt_dropped_flag */
95

1552
                if (cnt_dropped_flag && counting_type > 1 && counting_type < 7)
96
                    tc->dropframe = 1;
97
1552
                tc->frame = get_bits(&gb, 8);         /* n_frames */
98
1552
                if (full_timestamp_flag) {
99
1202
                    tc->full = 1;
100
1202
                    tc->seconds = get_bits(&gb, 6); /* seconds_value 0..59 */
101
1202
                    tc->minutes = get_bits(&gb, 6); /* minutes_value 0..59 */
102
1202
                    tc->hours = get_bits(&gb, 5);   /* hours_value 0..23 */
103
                } else {
104
350
                    tc->seconds = tc->minutes = tc->hours = tc->full = 0;
105
350
                    if (get_bits(&gb, 1)) {             /* seconds_flag */
106
81
                        tc->seconds = get_bits(&gb, 6);
107
81
                        if (get_bits(&gb, 1)) {         /* minutes_flag */
108
                            tc->minutes = get_bits(&gb, 6);
109
                            if (get_bits(&gb, 1))       /* hours_flag */
110
                                tc->hours = get_bits(&gb, 5);
111
                        }
112
                    }
113
                }
114
115
1552
                if (sps->time_offset_length > 0)
116
1552
                    skip_bits(&gb,
117
                              sps->time_offset_length); /* time_offset */
118
            }
119
        }
120
121
2746
        av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
122
2746
               h->ct_type, h->pic_struct);
123
    }
124
125
2766
    return 0;
126
}
127
128
3412
static int decode_picture_timing(H264SEIPictureTiming *h, GetBitContext *gb,
129
                                 void *logctx)
130
{
131
3412
    int index     = get_bits_count(gb);
132
3412
    int size_bits = get_bits_left(gb);
133
3412
    int size      = (size_bits + 7) / 8;
134
135
3412
    if (index & 7) {
136
        av_log(logctx, AV_LOG_ERROR, "Unaligned SEI payload\n");
137
        return AVERROR_INVALIDDATA;
138
    }
139
3412
    if (size > sizeof(h->payload)) {
140
        av_log(logctx, AV_LOG_ERROR, "Picture timing SEI payload too large\n");
141
        return AVERROR_INVALIDDATA;
142
    }
143
3412
    memcpy(h->payload, gb->buffer + index / 8, size);
144
145
3412
    h->payload_size_bits = size_bits;
146
147
3412
    h->present = 1;
148
3412
    return 0;
149
}
150
151
639
static int decode_registered_user_data_afd(H264SEIAFD *h, GetBitContext *gb, int size)
152
{
153
    int flag;
154
155
639
    if (size-- < 1)
156
        return AVERROR_INVALIDDATA;
157
639
    skip_bits(gb, 1);               // 0
158
639
    flag = get_bits(gb, 1);         // active_format_flag
159
639
    skip_bits(gb, 6);               // reserved
160
161
639
    if (flag) {
162
639
        if (size-- < 1)
163
            return AVERROR_INVALIDDATA;
164
639
        skip_bits(gb, 4);           // reserved
165
639
        h->active_format_description = get_bits(gb, 4);
166
639
        h->present                   = 1;
167
    }
168
169
639
    return 0;
170
}
171
172
6
static int decode_registered_user_data_closed_caption(H264SEIA53Caption *h,
173
                                                     GetBitContext *gb, void *logctx,
174
                                                     int size)
175
{
176
    int flag;
177
    int user_data_type_code;
178
    int cc_count;
179
180
6
    if (size < 3)
181
        return AVERROR(EINVAL);
182
183
6
    user_data_type_code = get_bits(gb, 8);
184
6
    if (user_data_type_code == 0x3) {
185
6
        skip_bits(gb, 1);           // reserved
186
187
6
        flag = get_bits(gb, 1);     // process_cc_data_flag
188
6
        if (flag) {
189
6
            skip_bits(gb, 1);       // zero bit
190
6
            cc_count = get_bits(gb, 5);
191
6
            skip_bits(gb, 8);       // reserved
192
6
            size -= 2;
193
194

6
            if (cc_count && size >= cc_count * 3) {
195
6
                int old_size = h->buf_ref ? h->buf_ref->size : 0;
196
6
                const uint64_t new_size = (old_size + cc_count
197
6
                                           * UINT64_C(3));
198
                int i, ret;
199
200
6
                if (new_size > INT_MAX)
201
                    return AVERROR(EINVAL);
202
203
                /* Allow merging of the cc data from two fields. */
204
6
                ret = av_buffer_realloc(&h->buf_ref, new_size);
205
6
                if (ret < 0)
206
                    return ret;
207
208
                /* Use of av_buffer_realloc assumes buffer is writeable */
209
19
                for (i = 0; i < cc_count; i++) {
210
13
                    h->buf_ref->data[old_size++] = get_bits(gb, 8);
211
13
                    h->buf_ref->data[old_size++] = get_bits(gb, 8);
212
13
                    h->buf_ref->data[old_size++] = get_bits(gb, 8);
213
                }
214
215
6
                skip_bits(gb, 8);   // marker_bits
216
            }
217
        }
218
    } else {
219
        int i;
220
        for (i = 0; i < size - 1; i++)
221
            skip_bits(gb, 8);
222
    }
223
224
6
    return 0;
225
}
226
227
645
static int decode_registered_user_data(H264SEIContext *h, GetBitContext *gb,
228
                                       void *logctx, int size)
229
{
230
    uint32_t country_code;
231
    uint32_t user_identifier;
232
233
645
    if (size < 7)
234
        return AVERROR_INVALIDDATA;
235
645
    size -= 7;
236
237
645
    country_code = get_bits(gb, 8); // itu_t_t35_country_code
238
645
    if (country_code == 0xFF) {
239
        skip_bits(gb, 8);           // itu_t_t35_country_code_extension_byte
240
        size--;
241
    }
242
243
    /* itu_t_t35_payload_byte follows */
244
645
    skip_bits(gb, 8);              // terminal provider code
245
645
    skip_bits(gb, 8);              // terminal provider oriented code
246
645
    user_identifier = get_bits_long(gb, 32);
247
248
645
    switch (user_identifier) {
249
639
        case MKBETAG('D', 'T', 'G', '1'):       // afd_data
250
639
            return decode_registered_user_data_afd(&h->afd, gb, size);
251
6
        case MKBETAG('G', 'A', '9', '4'):       // closed captions
252
6
            return decode_registered_user_data_closed_caption(&h->a53_caption, gb,
253
                                                              logctx, size);
254
        default:
255
            skip_bits(gb, size * 8);
256
            break;
257
    }
258
259
    return 0;
260
}
261
262
248
static int decode_unregistered_user_data(H264SEIUnregistered *h, GetBitContext *gb,
263
                                         void *logctx, int size)
264
{
265
    uint8_t *user_data;
266
    int e, build, i;
267
    AVBufferRef *buf_ref, **tmp;
268
269

248
    if (size < 16 || size >= INT_MAX - 1)
270
        return AVERROR_INVALIDDATA;
271
272
248
    tmp = av_realloc_array(h->buf_ref, h->nb_buf_ref + 1, sizeof(*h->buf_ref));
273
248
    if (!tmp)
274
        return AVERROR(ENOMEM);
275
248
    h->buf_ref = tmp;
276
277
248
    buf_ref = av_buffer_alloc(size + 1);
278
248
    if (!buf_ref)
279
        return AVERROR(ENOMEM);
280
248
    user_data = buf_ref->data;
281
282
52451
    for (i = 0; i < size; i++)
283
52203
        user_data[i] = get_bits(gb, 8);
284
285
248
    user_data[i] = 0;
286
248
    buf_ref->size = size;
287
248
    h->buf_ref[h->nb_buf_ref++] = buf_ref;
288
289
248
    e = sscanf(user_data + 16, "x264 - core %d", &build);
290

248
    if (e == 1 && build > 0)
291
77
        h->x264_build = build;
292

248
    if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
293
        h->x264_build = 67;
294
295
248
    return 0;
296
}
297
298
63
static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb, void *logctx)
299
{
300
63
    unsigned recovery_frame_cnt = get_ue_golomb_long(gb);
301
302
63
    if (recovery_frame_cnt >= (1<<MAX_LOG2_MAX_FRAME_NUM)) {
303
        av_log(logctx, AV_LOG_ERROR, "recovery_frame_cnt %u is out of range\n", recovery_frame_cnt);
304
        return AVERROR_INVALIDDATA;
305
    }
306
307
63
    h->recovery_frame_cnt = recovery_frame_cnt;
308
    /* 1b exact_match_flag,
309
     * 1b broken_link_flag,
310
     * 2b changing_slice_group_idc */
311
63
    skip_bits(gb, 4);
312
313
63
    return 0;
314
}
315
316
736
static int decode_buffering_period(H264SEIBufferingPeriod *h, GetBitContext *gb,
317
                                   const H264ParamSets *ps, void *logctx)
318
{
319
    unsigned int sps_id;
320
    int sched_sel_idx;
321
    const SPS *sps;
322
323
736
    sps_id = get_ue_golomb_31(gb);
324

736
    if (sps_id > 31 || !ps->sps_list[sps_id]) {
325
4
        av_log(logctx, AV_LOG_ERROR,
326
               "non-existing SPS %d referenced in buffering period\n", sps_id);
327
4
        return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
328
    }
329
732
    sps = (const SPS*)ps->sps_list[sps_id]->data;
330
331
    // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
332
732
    if (sps->nal_hrd_parameters_present_flag) {
333
586
        for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
334
293
            h->initial_cpb_removal_delay[sched_sel_idx] =
335
293
                get_bits_long(gb, sps->initial_cpb_removal_delay_length);
336
            // initial_cpb_removal_delay_offset
337
293
            skip_bits(gb, sps->initial_cpb_removal_delay_length);
338
        }
339
    }
340
732
    if (sps->vcl_hrd_parameters_present_flag) {
341
360
        for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
342
180
            h->initial_cpb_removal_delay[sched_sel_idx] =
343
180
                get_bits_long(gb, sps->initial_cpb_removal_delay_length);
344
            // initial_cpb_removal_delay_offset
345
180
            skip_bits(gb, sps->initial_cpb_removal_delay_length);
346
        }
347
    }
348
349
732
    h->present = 1;
350
732
    return 0;
351
}
352
353
static int decode_frame_packing_arrangement(H264SEIFramePacking *h,
354
                                            GetBitContext *gb)
355
{
356
    h->arrangement_id          = get_ue_golomb_long(gb);
357
    h->arrangement_cancel_flag = get_bits1(gb);
358
    h->present = !h->arrangement_cancel_flag;
359
360
    if (h->present) {
361
        h->arrangement_type = get_bits(gb, 7);
362
        h->quincunx_sampling_flag         = get_bits1(gb);
363
        h->content_interpretation_type    = get_bits(gb, 6);
364
365
        // spatial_flipping_flag, frame0_flipped_flag, field_views_flag
366
        skip_bits(gb, 3);
367
        h->current_frame_is_frame0_flag = get_bits1(gb);
368
        // frame0_self_contained_flag, frame1_self_contained_flag
369
        skip_bits(gb, 2);
370
371
        if (!h->quincunx_sampling_flag && h->arrangement_type != 5)
372
            skip_bits(gb, 16);      // frame[01]_grid_position_[xy]
373
        skip_bits(gb, 8);           // frame_packing_arrangement_reserved_byte
374
        h->arrangement_repetition_period = get_ue_golomb_long(gb);
375
    }
376
    skip_bits1(gb);                 // frame_packing_arrangement_extension_flag
377
378
    return 0;
379
}
380
381
2
static int decode_display_orientation(H264SEIDisplayOrientation *h,
382
                                      GetBitContext *gb)
383
{
384
2
    h->present = !get_bits1(gb);
385
386
2
    if (h->present) {
387
2
        h->hflip = get_bits1(gb);     // hor_flip
388
2
        h->vflip = get_bits1(gb);     // ver_flip
389
390
2
        h->anticlockwise_rotation = get_bits(gb, 16);
391
2
        get_ue_golomb_long(gb);       // display_orientation_repetition_period
392
2
        skip_bits1(gb);               // display_orientation_extension_flag
393
    }
394
395
2
    return 0;
396
}
397
398
static int decode_green_metadata(H264SEIGreenMetaData *h, GetBitContext *gb)
399
{
400
    h->green_metadata_type = get_bits(gb, 8);
401
402
    if (h->green_metadata_type == 0) {
403
        h->period_type = get_bits(gb, 8);
404
405
        if (h->period_type == 2)
406
            h->num_seconds = get_bits(gb, 16);
407
        else if (h->period_type == 3)
408
            h->num_pictures = get_bits(gb, 16);
409
410
        h->percent_non_zero_macroblocks            = get_bits(gb, 8);
411
        h->percent_intra_coded_macroblocks         = get_bits(gb, 8);
412
        h->percent_six_tap_filtering               = get_bits(gb, 8);
413
        h->percent_alpha_point_deblocking_instance = get_bits(gb, 8);
414
415
    } else if (h->green_metadata_type == 1) {
416
        h->xsd_metric_type  = get_bits(gb, 8);
417
        h->xsd_metric_value = get_bits(gb, 16);
418
    }
419
420
    return 0;
421
}
422
423
static int decode_alternative_transfer(H264SEIAlternativeTransfer *h,
424
                                       GetBitContext *gb)
425
{
426
    h->present = 1;
427
    h->preferred_transfer_characteristics = get_bits(gb, 8);
428
    return 0;
429
}
430
431
4047
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
432
                       const H264ParamSets *ps, void *logctx)
433
{
434
4047
    int master_ret = 0;
435
436

9404
    while (get_bits_left(gb) > 16 && show_bits(gb, 16)) {
437
        GetBitContext gb_payload;
438
5364
        int type = 0;
439
5364
        unsigned size = 0;
440
5364
        int ret  = 0;
441
442
        do {
443
5388
            if (get_bits_left(gb) < 8)
444
7
                return AVERROR_INVALIDDATA;
445
5388
            type += show_bits(gb, 8);
446
5388
        } while (get_bits(gb, 8) == 255);
447
448
        do {
449
5520
            if (get_bits_left(gb) < 8)
450
                return AVERROR_INVALIDDATA;
451
5520
            size += show_bits(gb, 8);
452
5520
        } while (get_bits(gb, 8) == 255);
453
454
5364
        if (size > get_bits_left(gb) / 8) {
455
7
            av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
456
                   type, 8*size, get_bits_left(gb));
457
7
            return AVERROR_INVALIDDATA;
458
        }
459
460
5357
        ret = init_get_bits8(&gb_payload, gb->buffer + get_bits_count(gb) / 8, size);
461
5357
        if (ret < 0)
462
            return ret;
463
464


5357
        switch (type) {
465
3412
        case H264_SEI_TYPE_PIC_TIMING: // Picture timing SEI
466
3412
            ret = decode_picture_timing(&h->picture_timing, &gb_payload, logctx);
467
3412
            break;
468
645
        case H264_SEI_TYPE_USER_DATA_REGISTERED:
469
645
            ret = decode_registered_user_data(h, &gb_payload, logctx, size);
470
645
            break;
471
248
        case H264_SEI_TYPE_USER_DATA_UNREGISTERED:
472
248
            ret = decode_unregistered_user_data(&h->unregistered, &gb_payload, logctx, size);
473
248
            break;
474
63
        case H264_SEI_TYPE_RECOVERY_POINT:
475
63
            ret = decode_recovery_point(&h->recovery_point, &gb_payload, logctx);
476
63
            break;
477
736
        case H264_SEI_TYPE_BUFFERING_PERIOD:
478
736
            ret = decode_buffering_period(&h->buffering_period, &gb_payload, ps, logctx);
479
736
            break;
480
        case H264_SEI_TYPE_FRAME_PACKING:
481
            ret = decode_frame_packing_arrangement(&h->frame_packing, &gb_payload);
482
            break;
483
2
        case H264_SEI_TYPE_DISPLAY_ORIENTATION:
484
2
            ret = decode_display_orientation(&h->display_orientation, &gb_payload);
485
2
            break;
486
        case H264_SEI_TYPE_GREEN_METADATA:
487
            ret = decode_green_metadata(&h->green_metadata, &gb_payload);
488
            break;
489
        case H264_SEI_TYPE_ALTERNATIVE_TRANSFER:
490
            ret = decode_alternative_transfer(&h->alternative_transfer, &gb_payload);
491
            break;
492
251
        default:
493
251
            av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
494
        }
495

5357
        if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
496
            return ret;
497
5357
        if (ret < 0)
498
4
            master_ret = ret;
499
500
5357
        if (get_bits_left(&gb_payload) < 0) {
501
2
            av_log(logctx, AV_LOG_WARNING, "SEI type %d overread by %d bits\n",
502
2
                   type, -get_bits_left(&gb_payload));
503
        }
504
505
5357
        skip_bits_long(gb, 8 * size);
506
    }
507
508
4040
    return master_ret;
509
}
510
511
22292
const char *ff_h264_sei_stereo_mode(const H264SEIFramePacking *h)
512
{
513
22292
    if (h->arrangement_cancel_flag == 0) {
514
        switch (h->arrangement_type) {
515
            case H264_SEI_FPA_TYPE_CHECKERBOARD:
516
                if (h->content_interpretation_type == 2)
517
                    return "checkerboard_rl";
518
                else
519
                    return "checkerboard_lr";
520
            case H264_SEI_FPA_TYPE_INTERLEAVE_COLUMN:
521
                if (h->content_interpretation_type == 2)
522
                    return "col_interleaved_rl";
523
                else
524
                    return "col_interleaved_lr";
525
            case H264_SEI_FPA_TYPE_INTERLEAVE_ROW:
526
                if (h->content_interpretation_type == 2)
527
                    return "row_interleaved_rl";
528
                else
529
                    return "row_interleaved_lr";
530
            case H264_SEI_FPA_TYPE_SIDE_BY_SIDE:
531
                if (h->content_interpretation_type == 2)
532
                    return "right_left";
533
                else
534
                    return "left_right";
535
            case H264_SEI_FPA_TYPE_TOP_BOTTOM:
536
                if (h->content_interpretation_type == 2)
537
                    return "bottom_top";
538
                else
539
                    return "top_bottom";
540
            case H264_SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
541
                if (h->content_interpretation_type == 2)
542
                    return "block_rl";
543
                else
544
                    return "block_lr";
545
            case H264_SEI_FPA_TYPE_2D:
546
            default:
547
                return "mono";
548
        }
549
22292
    } else if (h->arrangement_cancel_flag == 1) {
550
        return "mono";
551
    } else {
552
22292
        return NULL;
553
    }
554
}