GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h264_sei.c Lines: 194 305 63.6 %
Date: 2021-04-20 15:25:36 Branches: 86 163 52.8 %

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 "atsc_a53.h"
29
#include "avcodec.h"
30
#include "get_bits.h"
31
#include "golomb.h"
32
#include "h264_ps.h"
33
#include "h264_sei.h"
34
#include "internal.h"
35
36
#define AVERROR_PS_NOT_FOUND      FFERRTAG(0xF8,'?','P','S')
37
38
static const uint8_t sei_num_clock_ts_table[9] = {
39
    1, 1, 1, 2, 2, 3, 3, 2, 3
40
};
41
42
51336
void ff_h264_sei_uninit(H264SEIContext *h)
43
{
44
51336
    h->recovery_point.recovery_frame_cnt = -1;
45
46
51336
    h->picture_timing.dpb_output_delay  = 0;
47
51336
    h->picture_timing.cpb_removal_delay = -1;
48
49
51336
    h->picture_timing.present      = 0;
50
51336
    h->buffering_period.present    = 0;
51
51336
    h->frame_packing.present       = 0;
52
51336
    h->display_orientation.present = 0;
53
51336
    h->afd.present                 =  0;
54
55
51336
    av_buffer_unref(&h->a53_caption.buf_ref);
56
51420
    for (int i = 0; i < h->unregistered.nb_buf_ref; i++)
57
84
        av_buffer_unref(&h->unregistered.buf_ref[i]);
58
51336
    h->unregistered.nb_buf_ref = 0;
59
51336
    av_freep(&h->unregistered.buf_ref);
60
51336
}
61
62
3086
int ff_h264_sei_process_picture_timing(H264SEIPictureTiming *h, const SPS *sps,
63
                                       void *logctx)
64
{
65
    GetBitContext gb;
66
67
3086
    init_get_bits(&gb, h->payload, h->payload_size_bits);
68
69
3086
    if (sps->nal_hrd_parameters_present_flag ||
70
1805
        sps->vcl_hrd_parameters_present_flag) {
71
1281
        h->cpb_removal_delay = get_bits_long(&gb, sps->cpb_removal_delay_length);
72
1281
        h->dpb_output_delay  = get_bits_long(&gb, sps->dpb_output_delay_length);
73
    }
74
3086
    if (sps->pic_struct_present_flag) {
75
        unsigned int i, num_clock_ts;
76
77
3066
        h->pic_struct = get_bits(&gb, 4);
78
3066
        h->ct_type    = 0;
79
80
3066
        if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
81
            return AVERROR_INVALIDDATA;
82
83
3066
        num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
84
3066
        h->timecode_cnt = 0;
85
8086
        for (i = 0; i < num_clock_ts; i++) {
86
5020
            if (get_bits(&gb, 1)) {                      /* clock_timestamp_flag */
87
1552
                H264SEITimeCode *tc = &h->timecode[h->timecode_cnt++];
88
                unsigned int full_timestamp_flag;
89
                unsigned int counting_type, cnt_dropped_flag;
90
1552
                h->ct_type |= 1 << get_bits(&gb, 2);
91
1552
                skip_bits(&gb, 1);                       /* nuit_field_based_flag */
92
1552
                counting_type = get_bits(&gb, 5);        /* counting_type */
93
1552
                full_timestamp_flag = get_bits(&gb, 1);
94
1552
                skip_bits(&gb, 1);                       /* discontinuity_flag */
95
1552
                cnt_dropped_flag = get_bits(&gb, 1);      /* cnt_dropped_flag */
96

1552
                if (cnt_dropped_flag && counting_type > 1 && counting_type < 7)
97
                    tc->dropframe = 1;
98
1552
                tc->frame = get_bits(&gb, 8);         /* n_frames */
99
1552
                if (full_timestamp_flag) {
100
1202
                    tc->full = 1;
101
1202
                    tc->seconds = get_bits(&gb, 6); /* seconds_value 0..59 */
102
1202
                    tc->minutes = get_bits(&gb, 6); /* minutes_value 0..59 */
103
1202
                    tc->hours = get_bits(&gb, 5);   /* hours_value 0..23 */
104
                } else {
105
350
                    tc->seconds = tc->minutes = tc->hours = tc->full = 0;
106
350
                    if (get_bits(&gb, 1)) {             /* seconds_flag */
107
81
                        tc->seconds = get_bits(&gb, 6);
108
81
                        if (get_bits(&gb, 1)) {         /* minutes_flag */
109
                            tc->minutes = get_bits(&gb, 6);
110
                            if (get_bits(&gb, 1))       /* hours_flag */
111
                                tc->hours = get_bits(&gb, 5);
112
                        }
113
                    }
114
                }
115
116
1552
                if (sps->time_offset_length > 0)
117
1552
                    skip_bits(&gb,
118
                              sps->time_offset_length); /* time_offset */
119
            }
120
        }
121
122
3066
        av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
123
3066
               h->ct_type, h->pic_struct);
124
    }
125
126
3086
    return 0;
127
}
128
129
3856
static int decode_picture_timing(H264SEIPictureTiming *h, GetBitContext *gb,
130
                                 void *logctx)
131
{
132
3856
    int index     = get_bits_count(gb);
133
3856
    int size_bits = get_bits_left(gb);
134
3856
    int size      = (size_bits + 7) / 8;
135
136
3856
    if (index & 7) {
137
        av_log(logctx, AV_LOG_ERROR, "Unaligned SEI payload\n");
138
        return AVERROR_INVALIDDATA;
139
    }
140
3856
    if (size > sizeof(h->payload)) {
141
        av_log(logctx, AV_LOG_ERROR, "Picture timing SEI payload too large\n");
142
        return AVERROR_INVALIDDATA;
143
    }
144
3856
    memcpy(h->payload, gb->buffer + index / 8, size);
145
146
3856
    h->payload_size_bits = size_bits;
147
148
3856
    h->present = 1;
149
3856
    return 0;
150
}
151
152
863
static int decode_registered_user_data_afd(H264SEIAFD *h, GetBitContext *gb, int size)
153
{
154
    int flag;
155
156
863
    if (size-- < 1)
157
        return AVERROR_INVALIDDATA;
158
863
    skip_bits(gb, 1);               // 0
159
863
    flag = get_bits(gb, 1);         // active_format_flag
160
863
    skip_bits(gb, 6);               // reserved
161
162
863
    if (flag) {
163
863
        if (size-- < 1)
164
            return AVERROR_INVALIDDATA;
165
863
        skip_bits(gb, 4);           // reserved
166
863
        h->active_format_description = get_bits(gb, 4);
167
863
        h->present                   = 1;
168
    }
169
170
863
    return 0;
171
}
172
173
6
static int decode_registered_user_data_closed_caption(H264SEIA53Caption *h,
174
                                                     GetBitContext *gb, void *logctx,
175
                                                     int size)
176
{
177
6
    if (size < 3)
178
        return AVERROR(EINVAL);
179
180
6
    return ff_parse_a53_cc(&h->buf_ref, gb->buffer + get_bits_count(gb) / 8, size);
181
}
182
183
869
static int decode_registered_user_data(H264SEIContext *h, GetBitContext *gb,
184
                                       void *logctx, int size)
185
{
186
    int country_code, provider_code;
187
188
869
    if (size < 3)
189
        return AVERROR_INVALIDDATA;
190
869
    size -= 3;
191
192
869
    country_code = get_bits(gb, 8); // itu_t_t35_country_code
193
869
    if (country_code == 0xFF) {
194
        if (size < 1)
195
            return AVERROR_INVALIDDATA;
196
197
        skip_bits(gb, 8);           // itu_t_t35_country_code_extension_byte
198
        size--;
199
    }
200
201
869
    if (country_code != 0xB5) { // usa_country_code
202
        av_log(logctx, AV_LOG_VERBOSE,
203
               "Unsupported User Data Registered ITU-T T35 SEI message (country_code = %d)\n",
204
               country_code);
205
        return 0;
206
    }
207
208
    /* itu_t_t35_payload_byte follows */
209
869
    provider_code = get_bits(gb, 16);
210
211
869
    switch (provider_code) {
212
869
    case 0x31: { // atsc_provider_code
213
        uint32_t user_identifier;
214
215
869
        if (size < 4)
216
            return AVERROR_INVALIDDATA;
217
869
        size -= 4;
218
219
869
        user_identifier = get_bits_long(gb, 32);
220
        switch (user_identifier) {
221
863
        case MKBETAG('D', 'T', 'G', '1'):       // afd_data
222
863
            return decode_registered_user_data_afd(&h->afd, gb, size);
223
6
        case MKBETAG('G', 'A', '9', '4'):       // closed captions
224
6
            return decode_registered_user_data_closed_caption(&h->a53_caption, gb,
225
                                                              logctx, size);
226
        default:
227
            av_log(logctx, AV_LOG_VERBOSE,
228
                   "Unsupported User Data Registered ITU-T T35 SEI message (atsc user_identifier = 0x%04x)\n",
229
                   user_identifier);
230
            break;
231
        }
232
        break;
233
    }
234
    default:
235
        av_log(logctx, AV_LOG_VERBOSE,
236
               "Unsupported User Data Registered ITU-T T35 SEI message (provider_code = %d)\n",
237
               provider_code);
238
        break;
239
    }
240
241
    return 0;
242
}
243
244
258
static int decode_unregistered_user_data(H264SEIUnregistered *h, GetBitContext *gb,
245
                                         void *logctx, int size)
246
{
247
    uint8_t *user_data;
248
    int e, build, i;
249
    AVBufferRef *buf_ref, **tmp;
250
251

258
    if (size < 16 || size >= INT_MAX - 1)
252
        return AVERROR_INVALIDDATA;
253
254
258
    tmp = av_realloc_array(h->buf_ref, h->nb_buf_ref + 1, sizeof(*h->buf_ref));
255
258
    if (!tmp)
256
        return AVERROR(ENOMEM);
257
258
    h->buf_ref = tmp;
258
259
258
    buf_ref = av_buffer_alloc(size + 1);
260
258
    if (!buf_ref)
261
        return AVERROR(ENOMEM);
262
258
    user_data = buf_ref->data;
263
264
59281
    for (i = 0; i < size; i++)
265
59023
        user_data[i] = get_bits(gb, 8);
266
267
258
    user_data[i] = 0;
268
258
    buf_ref->size = size;
269
258
    h->buf_ref[h->nb_buf_ref++] = buf_ref;
270
271
258
    e = sscanf(user_data + 16, "x264 - core %d", &build);
272

258
    if (e == 1 && build > 0)
273
87
        h->x264_build = build;
274

258
    if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
275
        h->x264_build = 67;
276
277
258
    return 0;
278
}
279
280
76
static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb, void *logctx)
281
{
282
76
    unsigned recovery_frame_cnt = get_ue_golomb_long(gb);
283
284
76
    if (recovery_frame_cnt >= (1<<MAX_LOG2_MAX_FRAME_NUM)) {
285
        av_log(logctx, AV_LOG_ERROR, "recovery_frame_cnt %u is out of range\n", recovery_frame_cnt);
286
        return AVERROR_INVALIDDATA;
287
    }
288
289
76
    h->recovery_frame_cnt = recovery_frame_cnt;
290
    /* 1b exact_match_flag,
291
     * 1b broken_link_flag,
292
     * 2b changing_slice_group_idc */
293
76
    skip_bits(gb, 4);
294
295
76
    return 0;
296
}
297
298
749
static int decode_buffering_period(H264SEIBufferingPeriod *h, GetBitContext *gb,
299
                                   const H264ParamSets *ps, void *logctx)
300
{
301
    unsigned int sps_id;
302
    int sched_sel_idx;
303
    const SPS *sps;
304
305
749
    sps_id = get_ue_golomb_31(gb);
306

749
    if (sps_id > 31 || !ps->sps_list[sps_id]) {
307
4
        av_log(logctx, AV_LOG_ERROR,
308
               "non-existing SPS %d referenced in buffering period\n", sps_id);
309
4
        return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
310
    }
311
745
    sps = (const SPS*)ps->sps_list[sps_id]->data;
312
313
    // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
314
745
    if (sps->nal_hrd_parameters_present_flag) {
315
586
        for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
316
293
            h->initial_cpb_removal_delay[sched_sel_idx] =
317
293
                get_bits_long(gb, sps->initial_cpb_removal_delay_length);
318
            // initial_cpb_removal_delay_offset
319
293
            skip_bits(gb, sps->initial_cpb_removal_delay_length);
320
        }
321
    }
322
745
    if (sps->vcl_hrd_parameters_present_flag) {
323
360
        for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
324
180
            h->initial_cpb_removal_delay[sched_sel_idx] =
325
180
                get_bits_long(gb, sps->initial_cpb_removal_delay_length);
326
            // initial_cpb_removal_delay_offset
327
180
            skip_bits(gb, sps->initial_cpb_removal_delay_length);
328
        }
329
    }
330
331
745
    h->present = 1;
332
745
    return 0;
333
}
334
335
static int decode_frame_packing_arrangement(H264SEIFramePacking *h,
336
                                            GetBitContext *gb)
337
{
338
    h->arrangement_id          = get_ue_golomb_long(gb);
339
    h->arrangement_cancel_flag = get_bits1(gb);
340
    h->present = !h->arrangement_cancel_flag;
341
342
    if (h->present) {
343
        h->arrangement_type = get_bits(gb, 7);
344
        h->quincunx_sampling_flag         = get_bits1(gb);
345
        h->content_interpretation_type    = get_bits(gb, 6);
346
347
        // spatial_flipping_flag, frame0_flipped_flag, field_views_flag
348
        skip_bits(gb, 3);
349
        h->current_frame_is_frame0_flag = get_bits1(gb);
350
        // frame0_self_contained_flag, frame1_self_contained_flag
351
        skip_bits(gb, 2);
352
353
        if (!h->quincunx_sampling_flag && h->arrangement_type != 5)
354
            skip_bits(gb, 16);      // frame[01]_grid_position_[xy]
355
        skip_bits(gb, 8);           // frame_packing_arrangement_reserved_byte
356
        h->arrangement_repetition_period = get_ue_golomb_long(gb);
357
    }
358
    skip_bits1(gb);                 // frame_packing_arrangement_extension_flag
359
360
    return 0;
361
}
362
363
2
static int decode_display_orientation(H264SEIDisplayOrientation *h,
364
                                      GetBitContext *gb)
365
{
366
2
    h->present = !get_bits1(gb);
367
368
2
    if (h->present) {
369
2
        h->hflip = get_bits1(gb);     // hor_flip
370
2
        h->vflip = get_bits1(gb);     // ver_flip
371
372
2
        h->anticlockwise_rotation = get_bits(gb, 16);
373
2
        get_ue_golomb_long(gb);       // display_orientation_repetition_period
374
2
        skip_bits1(gb);               // display_orientation_extension_flag
375
    }
376
377
2
    return 0;
378
}
379
380
static int decode_green_metadata(H264SEIGreenMetaData *h, GetBitContext *gb)
381
{
382
    h->green_metadata_type = get_bits(gb, 8);
383
384
    if (h->green_metadata_type == 0) {
385
        h->period_type = get_bits(gb, 8);
386
387
        if (h->period_type == 2)
388
            h->num_seconds = get_bits(gb, 16);
389
        else if (h->period_type == 3)
390
            h->num_pictures = get_bits(gb, 16);
391
392
        h->percent_non_zero_macroblocks            = get_bits(gb, 8);
393
        h->percent_intra_coded_macroblocks         = get_bits(gb, 8);
394
        h->percent_six_tap_filtering               = get_bits(gb, 8);
395
        h->percent_alpha_point_deblocking_instance = get_bits(gb, 8);
396
397
    } else if (h->green_metadata_type == 1) {
398
        h->xsd_metric_type  = get_bits(gb, 8);
399
        h->xsd_metric_value = get_bits(gb, 16);
400
    }
401
402
    return 0;
403
}
404
405
static int decode_alternative_transfer(H264SEIAlternativeTransfer *h,
406
                                       GetBitContext *gb)
407
{
408
    h->present = 1;
409
    h->preferred_transfer_characteristics = get_bits(gb, 8);
410
    return 0;
411
}
412
413
4751
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
414
                       const H264ParamSets *ps, void *logctx)
415
{
416
4751
    int master_ret = 0;
417
418

10812
    while (get_bits_left(gb) > 16 && show_bits(gb, 16)) {
419
        GetBitContext gb_payload;
420
6068
        int type = 0;
421
6068
        unsigned size = 0;
422
6068
        int ret  = 0;
423
424
        do {
425
6092
            if (get_bits_left(gb) < 8)
426
7
                return AVERROR_INVALIDDATA;
427
6092
            type += show_bits(gb, 8);
428
6092
        } while (get_bits(gb, 8) == 255);
429
430
        do {
431
6244
            if (get_bits_left(gb) < 8)
432
                return AVERROR_INVALIDDATA;
433
6244
            size += show_bits(gb, 8);
434
6244
        } while (get_bits(gb, 8) == 255);
435
436
6068
        if (size > get_bits_left(gb) / 8) {
437
7
            av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
438
                   type, 8*size, get_bits_left(gb));
439
7
            return AVERROR_INVALIDDATA;
440
        }
441
442
6061
        ret = init_get_bits8(&gb_payload, gb->buffer + get_bits_count(gb) / 8, size);
443
6061
        if (ret < 0)
444
            return ret;
445
446


6061
        switch (type) {
447
3856
        case SEI_TYPE_PIC_TIMING: // Picture timing SEI
448
3856
            ret = decode_picture_timing(&h->picture_timing, &gb_payload, logctx);
449
3856
            break;
450
869
        case SEI_TYPE_USER_DATA_REGISTERED_ITU_T_T35:
451
869
            ret = decode_registered_user_data(h, &gb_payload, logctx, size);
452
869
            break;
453
258
        case SEI_TYPE_USER_DATA_UNREGISTERED:
454
258
            ret = decode_unregistered_user_data(&h->unregistered, &gb_payload, logctx, size);
455
258
            break;
456
76
        case SEI_TYPE_RECOVERY_POINT:
457
76
            ret = decode_recovery_point(&h->recovery_point, &gb_payload, logctx);
458
76
            break;
459
749
        case SEI_TYPE_BUFFERING_PERIOD:
460
749
            ret = decode_buffering_period(&h->buffering_period, &gb_payload, ps, logctx);
461
749
            break;
462
        case SEI_TYPE_FRAME_PACKING_ARRANGEMENT:
463
            ret = decode_frame_packing_arrangement(&h->frame_packing, &gb_payload);
464
            break;
465
2
        case SEI_TYPE_DISPLAY_ORIENTATION:
466
2
            ret = decode_display_orientation(&h->display_orientation, &gb_payload);
467
2
            break;
468
        case SEI_TYPE_GREEN_METADATA:
469
            ret = decode_green_metadata(&h->green_metadata, &gb_payload);
470
            break;
471
        case SEI_TYPE_ALTERNATIVE_TRANSFER_CHARACTERISTICS:
472
            ret = decode_alternative_transfer(&h->alternative_transfer, &gb_payload);
473
            break;
474
251
        default:
475
251
            av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
476
        }
477

6061
        if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
478
            return ret;
479
6061
        if (ret < 0)
480
4
            master_ret = ret;
481
482
6061
        if (get_bits_left(&gb_payload) < 0) {
483
2
            av_log(logctx, AV_LOG_WARNING, "SEI type %d overread by %d bits\n",
484
2
                   type, -get_bits_left(&gb_payload));
485
        }
486
487
6061
        skip_bits_long(gb, 8 * size);
488
    }
489
490
4744
    return master_ret;
491
}
492
493
22360
const char *ff_h264_sei_stereo_mode(const H264SEIFramePacking *h)
494
{
495
22360
    if (h->arrangement_cancel_flag == 0) {
496
        switch (h->arrangement_type) {
497
            case H264_SEI_FPA_TYPE_CHECKERBOARD:
498
                if (h->content_interpretation_type == 2)
499
                    return "checkerboard_rl";
500
                else
501
                    return "checkerboard_lr";
502
            case H264_SEI_FPA_TYPE_INTERLEAVE_COLUMN:
503
                if (h->content_interpretation_type == 2)
504
                    return "col_interleaved_rl";
505
                else
506
                    return "col_interleaved_lr";
507
            case H264_SEI_FPA_TYPE_INTERLEAVE_ROW:
508
                if (h->content_interpretation_type == 2)
509
                    return "row_interleaved_rl";
510
                else
511
                    return "row_interleaved_lr";
512
            case H264_SEI_FPA_TYPE_SIDE_BY_SIDE:
513
                if (h->content_interpretation_type == 2)
514
                    return "right_left";
515
                else
516
                    return "left_right";
517
            case H264_SEI_FPA_TYPE_TOP_BOTTOM:
518
                if (h->content_interpretation_type == 2)
519
                    return "bottom_top";
520
                else
521
                    return "top_bottom";
522
            case H264_SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
523
                if (h->content_interpretation_type == 2)
524
                    return "block_rl";
525
                else
526
                    return "block_lr";
527
            case H264_SEI_FPA_TYPE_2D:
528
            default:
529
                return "mono";
530
        }
531
22360
    } else if (h->arrangement_cancel_flag == 1) {
532
        return "mono";
533
    } else {
534
22360
        return NULL;
535
    }
536
}