GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h264_sei.c Lines: 191 293 65.2 %
Date: 2020-09-25 23:16:12 Branches: 85 158 53.8 %

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
50802
void ff_h264_sei_uninit(H264SEIContext *h)
43
{
44
50802
    h->recovery_point.recovery_frame_cnt = -1;
45
46
50802
    h->picture_timing.dpb_output_delay  = 0;
47
50802
    h->picture_timing.cpb_removal_delay = -1;
48
49
50802
    h->picture_timing.present      = 0;
50
50802
    h->buffering_period.present    = 0;
51
50802
    h->frame_packing.present       = 0;
52
50802
    h->display_orientation.present = 0;
53
50802
    h->afd.present                 =  0;
54
55
50802
    av_buffer_unref(&h->a53_caption.buf_ref);
56
50881
    for (int i = 0; i < h->unregistered.nb_buf_ref; i++)
57
79
        av_buffer_unref(&h->unregistered.buf_ref[i]);
58
50802
    h->unregistered.nb_buf_ref = 0;
59
50802
    av_freep(&h->unregistered.buf_ref);
60
50802
}
61
62
2766
int ff_h264_sei_process_picture_timing(H264SEIPictureTiming *h, const SPS *sps,
63
                                       void *logctx)
64
{
65
    GetBitContext gb;
66
67
2766
    init_get_bits(&gb, h->payload, h->payload_size_bits);
68
69
2766
    if (sps->nal_hrd_parameters_present_flag ||
70
1485
        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
2766
    if (sps->pic_struct_present_flag) {
75
        unsigned int i, num_clock_ts;
76
77
2746
        h->pic_struct = get_bits(&gb, 4);
78
2746
        h->ct_type    = 0;
79
80
2746
        if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
81
            return AVERROR_INVALIDDATA;
82
83
2746
        num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
84
2746
        h->timecode_cnt = 0;
85
7446
        for (i = 0; i < num_clock_ts; i++) {
86
4700
            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
2746
        av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
123
2746
               h->ct_type, h->pic_struct);
124
    }
125
126
2766
    return 0;
127
}
128
129
3412
static int decode_picture_timing(H264SEIPictureTiming *h, GetBitContext *gb,
130
                                 void *logctx)
131
{
132
3412
    int index     = get_bits_count(gb);
133
3412
    int size_bits = get_bits_left(gb);
134
3412
    int size      = (size_bits + 7) / 8;
135
136
3412
    if (index & 7) {
137
        av_log(logctx, AV_LOG_ERROR, "Unaligned SEI payload\n");
138
        return AVERROR_INVALIDDATA;
139
    }
140
3412
    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
3412
    memcpy(h->payload, gb->buffer + index / 8, size);
145
146
3412
    h->payload_size_bits = size_bits;
147
148
3412
    h->present = 1;
149
3412
    return 0;
150
}
151
152
639
static int decode_registered_user_data_afd(H264SEIAFD *h, GetBitContext *gb, int size)
153
{
154
    int flag;
155
156
639
    if (size-- < 1)
157
        return AVERROR_INVALIDDATA;
158
639
    skip_bits(gb, 1);               // 0
159
639
    flag = get_bits(gb, 1);         // active_format_flag
160
639
    skip_bits(gb, 6);               // reserved
161
162
639
    if (flag) {
163
639
        if (size-- < 1)
164
            return AVERROR_INVALIDDATA;
165
639
        skip_bits(gb, 4);           // reserved
166
639
        h->active_format_description = get_bits(gb, 4);
167
639
        h->present                   = 1;
168
    }
169
170
639
    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
645
static int decode_registered_user_data(H264SEIContext *h, GetBitContext *gb,
184
                                       void *logctx, int size)
185
{
186
    uint32_t country_code;
187
    uint32_t user_identifier;
188
189
645
    if (size < 7)
190
        return AVERROR_INVALIDDATA;
191
645
    size -= 7;
192
193
645
    country_code = get_bits(gb, 8); // itu_t_t35_country_code
194
645
    if (country_code == 0xFF) {
195
        skip_bits(gb, 8);           // itu_t_t35_country_code_extension_byte
196
        size--;
197
    }
198
199
    /* itu_t_t35_payload_byte follows */
200
645
    skip_bits(gb, 8);              // terminal provider code
201
645
    skip_bits(gb, 8);              // terminal provider oriented code
202
645
    user_identifier = get_bits_long(gb, 32);
203
204
645
    switch (user_identifier) {
205
639
        case MKBETAG('D', 'T', 'G', '1'):       // afd_data
206
639
            return decode_registered_user_data_afd(&h->afd, gb, size);
207
6
        case MKBETAG('G', 'A', '9', '4'):       // closed captions
208
6
            return decode_registered_user_data_closed_caption(&h->a53_caption, gb,
209
                                                              logctx, size);
210
        default:
211
            skip_bits(gb, size * 8);
212
            break;
213
    }
214
215
    return 0;
216
}
217
218
248
static int decode_unregistered_user_data(H264SEIUnregistered *h, GetBitContext *gb,
219
                                         void *logctx, int size)
220
{
221
    uint8_t *user_data;
222
    int e, build, i;
223
    AVBufferRef *buf_ref, **tmp;
224
225

248
    if (size < 16 || size >= INT_MAX - 1)
226
        return AVERROR_INVALIDDATA;
227
228
248
    tmp = av_realloc_array(h->buf_ref, h->nb_buf_ref + 1, sizeof(*h->buf_ref));
229
248
    if (!tmp)
230
        return AVERROR(ENOMEM);
231
248
    h->buf_ref = tmp;
232
233
248
    buf_ref = av_buffer_alloc(size + 1);
234
248
    if (!buf_ref)
235
        return AVERROR(ENOMEM);
236
248
    user_data = buf_ref->data;
237
238
52451
    for (i = 0; i < size; i++)
239
52203
        user_data[i] = get_bits(gb, 8);
240
241
248
    user_data[i] = 0;
242
248
    buf_ref->size = size;
243
248
    h->buf_ref[h->nb_buf_ref++] = buf_ref;
244
245
248
    e = sscanf(user_data + 16, "x264 - core %d", &build);
246

248
    if (e == 1 && build > 0)
247
77
        h->x264_build = build;
248

248
    if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
249
        h->x264_build = 67;
250
251
248
    return 0;
252
}
253
254
63
static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb, void *logctx)
255
{
256
63
    unsigned recovery_frame_cnt = get_ue_golomb_long(gb);
257
258
63
    if (recovery_frame_cnt >= (1<<MAX_LOG2_MAX_FRAME_NUM)) {
259
        av_log(logctx, AV_LOG_ERROR, "recovery_frame_cnt %u is out of range\n", recovery_frame_cnt);
260
        return AVERROR_INVALIDDATA;
261
    }
262
263
63
    h->recovery_frame_cnt = recovery_frame_cnt;
264
    /* 1b exact_match_flag,
265
     * 1b broken_link_flag,
266
     * 2b changing_slice_group_idc */
267
63
    skip_bits(gb, 4);
268
269
63
    return 0;
270
}
271
272
736
static int decode_buffering_period(H264SEIBufferingPeriod *h, GetBitContext *gb,
273
                                   const H264ParamSets *ps, void *logctx)
274
{
275
    unsigned int sps_id;
276
    int sched_sel_idx;
277
    const SPS *sps;
278
279
736
    sps_id = get_ue_golomb_31(gb);
280

736
    if (sps_id > 31 || !ps->sps_list[sps_id]) {
281
4
        av_log(logctx, AV_LOG_ERROR,
282
               "non-existing SPS %d referenced in buffering period\n", sps_id);
283
4
        return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
284
    }
285
732
    sps = (const SPS*)ps->sps_list[sps_id]->data;
286
287
    // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
288
732
    if (sps->nal_hrd_parameters_present_flag) {
289
586
        for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
290
293
            h->initial_cpb_removal_delay[sched_sel_idx] =
291
293
                get_bits_long(gb, sps->initial_cpb_removal_delay_length);
292
            // initial_cpb_removal_delay_offset
293
293
            skip_bits(gb, sps->initial_cpb_removal_delay_length);
294
        }
295
    }
296
732
    if (sps->vcl_hrd_parameters_present_flag) {
297
360
        for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
298
180
            h->initial_cpb_removal_delay[sched_sel_idx] =
299
180
                get_bits_long(gb, sps->initial_cpb_removal_delay_length);
300
            // initial_cpb_removal_delay_offset
301
180
            skip_bits(gb, sps->initial_cpb_removal_delay_length);
302
        }
303
    }
304
305
732
    h->present = 1;
306
732
    return 0;
307
}
308
309
static int decode_frame_packing_arrangement(H264SEIFramePacking *h,
310
                                            GetBitContext *gb)
311
{
312
    h->arrangement_id          = get_ue_golomb_long(gb);
313
    h->arrangement_cancel_flag = get_bits1(gb);
314
    h->present = !h->arrangement_cancel_flag;
315
316
    if (h->present) {
317
        h->arrangement_type = get_bits(gb, 7);
318
        h->quincunx_sampling_flag         = get_bits1(gb);
319
        h->content_interpretation_type    = get_bits(gb, 6);
320
321
        // spatial_flipping_flag, frame0_flipped_flag, field_views_flag
322
        skip_bits(gb, 3);
323
        h->current_frame_is_frame0_flag = get_bits1(gb);
324
        // frame0_self_contained_flag, frame1_self_contained_flag
325
        skip_bits(gb, 2);
326
327
        if (!h->quincunx_sampling_flag && h->arrangement_type != 5)
328
            skip_bits(gb, 16);      // frame[01]_grid_position_[xy]
329
        skip_bits(gb, 8);           // frame_packing_arrangement_reserved_byte
330
        h->arrangement_repetition_period = get_ue_golomb_long(gb);
331
    }
332
    skip_bits1(gb);                 // frame_packing_arrangement_extension_flag
333
334
    return 0;
335
}
336
337
2
static int decode_display_orientation(H264SEIDisplayOrientation *h,
338
                                      GetBitContext *gb)
339
{
340
2
    h->present = !get_bits1(gb);
341
342
2
    if (h->present) {
343
2
        h->hflip = get_bits1(gb);     // hor_flip
344
2
        h->vflip = get_bits1(gb);     // ver_flip
345
346
2
        h->anticlockwise_rotation = get_bits(gb, 16);
347
2
        get_ue_golomb_long(gb);       // display_orientation_repetition_period
348
2
        skip_bits1(gb);               // display_orientation_extension_flag
349
    }
350
351
2
    return 0;
352
}
353
354
static int decode_green_metadata(H264SEIGreenMetaData *h, GetBitContext *gb)
355
{
356
    h->green_metadata_type = get_bits(gb, 8);
357
358
    if (h->green_metadata_type == 0) {
359
        h->period_type = get_bits(gb, 8);
360
361
        if (h->period_type == 2)
362
            h->num_seconds = get_bits(gb, 16);
363
        else if (h->period_type == 3)
364
            h->num_pictures = get_bits(gb, 16);
365
366
        h->percent_non_zero_macroblocks            = get_bits(gb, 8);
367
        h->percent_intra_coded_macroblocks         = get_bits(gb, 8);
368
        h->percent_six_tap_filtering               = get_bits(gb, 8);
369
        h->percent_alpha_point_deblocking_instance = get_bits(gb, 8);
370
371
    } else if (h->green_metadata_type == 1) {
372
        h->xsd_metric_type  = get_bits(gb, 8);
373
        h->xsd_metric_value = get_bits(gb, 16);
374
    }
375
376
    return 0;
377
}
378
379
static int decode_alternative_transfer(H264SEIAlternativeTransfer *h,
380
                                       GetBitContext *gb)
381
{
382
    h->present = 1;
383
    h->preferred_transfer_characteristics = get_bits(gb, 8);
384
    return 0;
385
}
386
387
4047
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
388
                       const H264ParamSets *ps, void *logctx)
389
{
390
4047
    int master_ret = 0;
391
392

9404
    while (get_bits_left(gb) > 16 && show_bits(gb, 16)) {
393
        GetBitContext gb_payload;
394
5364
        int type = 0;
395
5364
        unsigned size = 0;
396
5364
        int ret  = 0;
397
398
        do {
399
5388
            if (get_bits_left(gb) < 8)
400
7
                return AVERROR_INVALIDDATA;
401
5388
            type += show_bits(gb, 8);
402
5388
        } while (get_bits(gb, 8) == 255);
403
404
        do {
405
5520
            if (get_bits_left(gb) < 8)
406
                return AVERROR_INVALIDDATA;
407
5520
            size += show_bits(gb, 8);
408
5520
        } while (get_bits(gb, 8) == 255);
409
410
5364
        if (size > get_bits_left(gb) / 8) {
411
7
            av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
412
                   type, 8*size, get_bits_left(gb));
413
7
            return AVERROR_INVALIDDATA;
414
        }
415
416
5357
        ret = init_get_bits8(&gb_payload, gb->buffer + get_bits_count(gb) / 8, size);
417
5357
        if (ret < 0)
418
            return ret;
419
420


5357
        switch (type) {
421
3412
        case H264_SEI_TYPE_PIC_TIMING: // Picture timing SEI
422
3412
            ret = decode_picture_timing(&h->picture_timing, &gb_payload, logctx);
423
3412
            break;
424
645
        case H264_SEI_TYPE_USER_DATA_REGISTERED:
425
645
            ret = decode_registered_user_data(h, &gb_payload, logctx, size);
426
645
            break;
427
248
        case H264_SEI_TYPE_USER_DATA_UNREGISTERED:
428
248
            ret = decode_unregistered_user_data(&h->unregistered, &gb_payload, logctx, size);
429
248
            break;
430
63
        case H264_SEI_TYPE_RECOVERY_POINT:
431
63
            ret = decode_recovery_point(&h->recovery_point, &gb_payload, logctx);
432
63
            break;
433
736
        case H264_SEI_TYPE_BUFFERING_PERIOD:
434
736
            ret = decode_buffering_period(&h->buffering_period, &gb_payload, ps, logctx);
435
736
            break;
436
        case H264_SEI_TYPE_FRAME_PACKING:
437
            ret = decode_frame_packing_arrangement(&h->frame_packing, &gb_payload);
438
            break;
439
2
        case H264_SEI_TYPE_DISPLAY_ORIENTATION:
440
2
            ret = decode_display_orientation(&h->display_orientation, &gb_payload);
441
2
            break;
442
        case H264_SEI_TYPE_GREEN_METADATA:
443
            ret = decode_green_metadata(&h->green_metadata, &gb_payload);
444
            break;
445
        case H264_SEI_TYPE_ALTERNATIVE_TRANSFER:
446
            ret = decode_alternative_transfer(&h->alternative_transfer, &gb_payload);
447
            break;
448
251
        default:
449
251
            av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
450
        }
451

5357
        if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
452
            return ret;
453
5357
        if (ret < 0)
454
4
            master_ret = ret;
455
456
5357
        if (get_bits_left(&gb_payload) < 0) {
457
2
            av_log(logctx, AV_LOG_WARNING, "SEI type %d overread by %d bits\n",
458
2
                   type, -get_bits_left(&gb_payload));
459
        }
460
461
5357
        skip_bits_long(gb, 8 * size);
462
    }
463
464
4040
    return master_ret;
465
}
466
467
22292
const char *ff_h264_sei_stereo_mode(const H264SEIFramePacking *h)
468
{
469
22292
    if (h->arrangement_cancel_flag == 0) {
470
        switch (h->arrangement_type) {
471
            case H264_SEI_FPA_TYPE_CHECKERBOARD:
472
                if (h->content_interpretation_type == 2)
473
                    return "checkerboard_rl";
474
                else
475
                    return "checkerboard_lr";
476
            case H264_SEI_FPA_TYPE_INTERLEAVE_COLUMN:
477
                if (h->content_interpretation_type == 2)
478
                    return "col_interleaved_rl";
479
                else
480
                    return "col_interleaved_lr";
481
            case H264_SEI_FPA_TYPE_INTERLEAVE_ROW:
482
                if (h->content_interpretation_type == 2)
483
                    return "row_interleaved_rl";
484
                else
485
                    return "row_interleaved_lr";
486
            case H264_SEI_FPA_TYPE_SIDE_BY_SIDE:
487
                if (h->content_interpretation_type == 2)
488
                    return "right_left";
489
                else
490
                    return "left_right";
491
            case H264_SEI_FPA_TYPE_TOP_BOTTOM:
492
                if (h->content_interpretation_type == 2)
493
                    return "bottom_top";
494
                else
495
                    return "top_bottom";
496
            case H264_SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
497
                if (h->content_interpretation_type == 2)
498
                    return "block_rl";
499
                else
500
                    return "block_lr";
501
            case H264_SEI_FPA_TYPE_2D:
502
            default:
503
                return "mono";
504
        }
505
22292
    } else if (h->arrangement_cancel_flag == 1) {
506
        return "mono";
507
    } else {
508
22292
        return NULL;
509
    }
510
}