GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h264_sei.c Lines: 198 297 66.7 %
Date: 2019-11-22 03:34:36 Branches: 97 174 55.7 %

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
50216
void ff_h264_sei_uninit(H264SEIContext *h)
42
{
43
50216
    h->recovery_point.recovery_frame_cnt = -1;
44
45
50216
    h->picture_timing.dpb_output_delay  = 0;
46
50216
    h->picture_timing.cpb_removal_delay = -1;
47
48
50216
    h->picture_timing.present      = 0;
49
50216
    h->buffering_period.present    = 0;
50
50216
    h->frame_packing.present       = 0;
51
50216
    h->display_orientation.present = 0;
52
50216
    h->afd.present                 =  0;
53
54
50216
    av_buffer_unref(&h->a53_caption.buf_ref);
55
50216
}
56
57
3412
static int decode_picture_timing(H264SEIPictureTiming *h, GetBitContext *gb,
58
                                 const H264ParamSets *ps, void *logctx)
59
{
60
    int i;
61
3412
    const SPS *sps = ps->sps;
62
63
112596
    for (i = 0; i<MAX_SPS_COUNT; i++)
64

109184
        if ((!sps || !sps->log2_max_frame_num) && ps->sps_list[i])
65
75
            sps = (const SPS *)ps->sps_list[i]->data;
66
67
3412
    if (!sps) {
68
52
        av_log(logctx, AV_LOG_ERROR, "SPS unavailable in decode_picture_timing\n");
69
52
        return AVERROR_PS_NOT_FOUND;
70
    }
71
72
3360
    if (sps->nal_hrd_parameters_present_flag ||
73
1723
        sps->vcl_hrd_parameters_present_flag) {
74
1637
        h->cpb_removal_delay = get_bits_long(gb, sps->cpb_removal_delay_length);
75
1637
        h->dpb_output_delay  = get_bits_long(gb, sps->dpb_output_delay_length);
76
    }
77
3360
    if (sps->pic_struct_present_flag) {
78
        unsigned int i, num_clock_ts;
79
80
3332
        h->pic_struct = get_bits(gb, 4);
81
3332
        h->ct_type    = 0;
82
83
3332
        if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
84
            return AVERROR_INVALIDDATA;
85
86
3332
        num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
87
3332
        h->timecode_cnt = 0;
88
8296
        for (i = 0; i < num_clock_ts; i++) {
89
4964
            if (get_bits(gb, 1)) {                      /* clock_timestamp_flag */
90
1904
                H264SEITimeCode *tc = &h->timecode[h->timecode_cnt++];
91
                unsigned int full_timestamp_flag;
92
                unsigned int counting_type, cnt_dropped_flag;
93
1904
                h->ct_type |= 1 << get_bits(gb, 2);
94
1904
                skip_bits(gb, 1);                       /* nuit_field_based_flag */
95
1904
                counting_type = get_bits(gb, 5);        /* counting_type */
96
1904
                full_timestamp_flag = get_bits(gb, 1);
97
1904
                skip_bits(gb, 1);                       /* discontinuity_flag */
98
1904
                cnt_dropped_flag = get_bits(gb, 1);      /* cnt_dropped_flag */
99

1904
                if (cnt_dropped_flag && counting_type > 1 && counting_type < 7)
100
                    tc->dropframe = 1;
101
1904
                tc->frame = get_bits(gb, 8);         /* n_frames */
102
1904
                if (full_timestamp_flag) {
103
1202
                    tc->full = 1;
104
1202
                    tc->seconds = get_bits(gb, 6); /* seconds_value 0..59 */
105
1202
                    tc->minutes = get_bits(gb, 6); /* minutes_value 0..59 */
106
1202
                    tc->hours = get_bits(gb, 5);   /* hours_value 0..23 */
107
                } else {
108
702
                    tc->seconds = tc->minutes = tc->hours = tc->full = 0;
109
702
                    if (get_bits(gb, 1)) {             /* seconds_flag */
110
339
                        tc->seconds = get_bits(gb, 6);
111
339
                        if (get_bits(gb, 1)) {         /* minutes_flag */
112
327
                            tc->minutes = get_bits(gb, 6);
113
327
                            if (get_bits(gb, 1))       /* hours_flag */
114
                                tc->hours = get_bits(gb, 5);
115
                        }
116
                    }
117
                }
118
119
1904
                if (sps->time_offset_length > 0)
120
1904
                    skip_bits(gb,
121
                              sps->time_offset_length); /* time_offset */
122
            }
123
        }
124
125
3332
        av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
126
3332
               h->ct_type, h->pic_struct);
127
    }
128
129
3360
    h->present = 1;
130
3360
    return 0;
131
}
132
133
639
static int decode_registered_user_data_afd(H264SEIAFD *h, GetBitContext *gb, int size)
134
{
135
    int flag;
136
137
639
    if (size-- < 1)
138
        return AVERROR_INVALIDDATA;
139
639
    skip_bits(gb, 1);               // 0
140
639
    flag = get_bits(gb, 1);         // active_format_flag
141
639
    skip_bits(gb, 6);               // reserved
142
143
639
    if (flag) {
144
639
        if (size-- < 1)
145
            return AVERROR_INVALIDDATA;
146
639
        skip_bits(gb, 4);           // reserved
147
639
        h->active_format_description = get_bits(gb, 4);
148
639
        h->present                   = 1;
149
    }
150
151
639
    return 0;
152
}
153
154
6
static int decode_registered_user_data_closed_caption(H264SEIA53Caption *h,
155
                                                     GetBitContext *gb, void *logctx,
156
                                                     int size)
157
{
158
    int flag;
159
    int user_data_type_code;
160
    int cc_count;
161
162
6
    if (size < 3)
163
        return AVERROR(EINVAL);
164
165
6
    user_data_type_code = get_bits(gb, 8);
166
6
    if (user_data_type_code == 0x3) {
167
6
        skip_bits(gb, 1);           // reserved
168
169
6
        flag = get_bits(gb, 1);     // process_cc_data_flag
170
6
        if (flag) {
171
6
            skip_bits(gb, 1);       // zero bit
172
6
            cc_count = get_bits(gb, 5);
173
6
            skip_bits(gb, 8);       // reserved
174
6
            size -= 2;
175
176

6
            if (cc_count && size >= cc_count * 3) {
177
6
                int old_size = h->buf_ref ? h->buf_ref->size : 0;
178
6
                const uint64_t new_size = (old_size + cc_count
179
6
                                           * UINT64_C(3));
180
                int i, ret;
181
182
6
                if (new_size > INT_MAX)
183
                    return AVERROR(EINVAL);
184
185
                /* Allow merging of the cc data from two fields. */
186
6
                ret = av_buffer_realloc(&h->buf_ref, new_size);
187
6
                if (ret < 0)
188
                    return ret;
189
190
                /* Use of av_buffer_realloc assumes buffer is writeable */
191
19
                for (i = 0; i < cc_count; i++) {
192
13
                    h->buf_ref->data[old_size++] = get_bits(gb, 8);
193
13
                    h->buf_ref->data[old_size++] = get_bits(gb, 8);
194
13
                    h->buf_ref->data[old_size++] = get_bits(gb, 8);
195
                }
196
197
6
                skip_bits(gb, 8);   // marker_bits
198
            }
199
        }
200
    } else {
201
        int i;
202
        for (i = 0; i < size - 1; i++)
203
            skip_bits(gb, 8);
204
    }
205
206
6
    return 0;
207
}
208
209
645
static int decode_registered_user_data(H264SEIContext *h, GetBitContext *gb,
210
                                       void *logctx, int size)
211
{
212
    uint32_t country_code;
213
    uint32_t user_identifier;
214
215
645
    if (size < 7)
216
        return AVERROR_INVALIDDATA;
217
645
    size -= 7;
218
219
645
    country_code = get_bits(gb, 8); // itu_t_t35_country_code
220
645
    if (country_code == 0xFF) {
221
        skip_bits(gb, 8);           // itu_t_t35_country_code_extension_byte
222
        size--;
223
    }
224
225
    /* itu_t_t35_payload_byte follows */
226
645
    skip_bits(gb, 8);              // terminal provider code
227
645
    skip_bits(gb, 8);              // terminal provider oriented code
228
645
    user_identifier = get_bits_long(gb, 32);
229
230
645
    switch (user_identifier) {
231
639
        case MKBETAG('D', 'T', 'G', '1'):       // afd_data
232
639
            return decode_registered_user_data_afd(&h->afd, gb, size);
233
6
        case MKBETAG('G', 'A', '9', '4'):       // closed captions
234
6
            return decode_registered_user_data_closed_caption(&h->a53_caption, gb,
235
                                                              logctx, size);
236
        default:
237
            skip_bits(gb, size * 8);
238
            break;
239
    }
240
241
    return 0;
242
}
243
244
248
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
250

248
    if (size < 16 || size >= INT_MAX - 16)
251
        return AVERROR_INVALIDDATA;
252
253
248
    user_data = av_malloc(16 + size + 1);
254
248
    if (!user_data)
255
        return AVERROR(ENOMEM);
256
257
56419
    for (i = 0; i < size + 16; i++)
258
56171
        user_data[i] = get_bits(gb, 8);
259
260
248
    user_data[i] = 0;
261
248
    e = sscanf(user_data + 16, "x264 - core %d", &build);
262

248
    if (e == 1 && build > 0)
263
77
        h->x264_build = build;
264

248
    if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
265
        h->x264_build = 67;
266
267
248
    av_free(user_data);
268
248
    return 0;
269
}
270
271
54
static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb, void *logctx)
272
{
273
54
    unsigned recovery_frame_cnt = get_ue_golomb_long(gb);
274
275
54
    if (recovery_frame_cnt >= (1<<MAX_LOG2_MAX_FRAME_NUM)) {
276
        av_log(logctx, AV_LOG_ERROR, "recovery_frame_cnt %u is out of range\n", recovery_frame_cnt);
277
        return AVERROR_INVALIDDATA;
278
    }
279
280
54
    h->recovery_frame_cnt = recovery_frame_cnt;
281
    /* 1b exact_match_flag,
282
     * 1b broken_link_flag,
283
     * 2b changing_slice_group_idc */
284
54
    skip_bits(gb, 4);
285
286
54
    return 0;
287
}
288
289
736
static int decode_buffering_period(H264SEIBufferingPeriod *h, GetBitContext *gb,
290
                                   const H264ParamSets *ps, void *logctx)
291
{
292
    unsigned int sps_id;
293
    int sched_sel_idx;
294
    const SPS *sps;
295
296
736
    sps_id = get_ue_golomb_31(gb);
297

736
    if (sps_id > 31 || !ps->sps_list[sps_id]) {
298
4
        av_log(logctx, AV_LOG_ERROR,
299
               "non-existing SPS %d referenced in buffering period\n", sps_id);
300
4
        return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
301
    }
302
732
    sps = (const SPS*)ps->sps_list[sps_id]->data;
303
304
    // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
305
732
    if (sps->nal_hrd_parameters_present_flag) {
306
586
        for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
307
293
            h->initial_cpb_removal_delay[sched_sel_idx] =
308
293
                get_bits_long(gb, sps->initial_cpb_removal_delay_length);
309
            // initial_cpb_removal_delay_offset
310
293
            skip_bits(gb, sps->initial_cpb_removal_delay_length);
311
        }
312
    }
313
732
    if (sps->vcl_hrd_parameters_present_flag) {
314
360
        for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
315
180
            h->initial_cpb_removal_delay[sched_sel_idx] =
316
180
                get_bits_long(gb, sps->initial_cpb_removal_delay_length);
317
            // initial_cpb_removal_delay_offset
318
180
            skip_bits(gb, sps->initial_cpb_removal_delay_length);
319
        }
320
    }
321
322
732
    h->present = 1;
323
732
    return 0;
324
}
325
326
static int decode_frame_packing_arrangement(H264SEIFramePacking *h,
327
                                            GetBitContext *gb)
328
{
329
    h->arrangement_id          = get_ue_golomb_long(gb);
330
    h->arrangement_cancel_flag = get_bits1(gb);
331
    h->present = !h->arrangement_cancel_flag;
332
333
    if (h->present) {
334
        h->arrangement_type = get_bits(gb, 7);
335
        h->quincunx_sampling_flag         = get_bits1(gb);
336
        h->content_interpretation_type    = get_bits(gb, 6);
337
338
        // spatial_flipping_flag, frame0_flipped_flag, field_views_flag
339
        skip_bits(gb, 3);
340
        h->current_frame_is_frame0_flag = get_bits1(gb);
341
        // frame0_self_contained_flag, frame1_self_contained_flag
342
        skip_bits(gb, 2);
343
344
        if (!h->quincunx_sampling_flag && h->arrangement_type != 5)
345
            skip_bits(gb, 16);      // frame[01]_grid_position_[xy]
346
        skip_bits(gb, 8);           // frame_packing_arrangement_reserved_byte
347
        h->arrangement_repetition_period = get_ue_golomb_long(gb);
348
    }
349
    skip_bits1(gb);                 // frame_packing_arrangement_extension_flag
350
351
    return 0;
352
}
353
354
2
static int decode_display_orientation(H264SEIDisplayOrientation *h,
355
                                      GetBitContext *gb)
356
{
357
2
    h->present = !get_bits1(gb);
358
359
2
    if (h->present) {
360
2
        h->hflip = get_bits1(gb);     // hor_flip
361
2
        h->vflip = get_bits1(gb);     // ver_flip
362
363
2
        h->anticlockwise_rotation = get_bits(gb, 16);
364
2
        get_ue_golomb_long(gb);       // display_orientation_repetition_period
365
2
        skip_bits1(gb);               // display_orientation_extension_flag
366
    }
367
368
2
    return 0;
369
}
370
371
static int decode_green_metadata(H264SEIGreenMetaData *h, GetBitContext *gb)
372
{
373
    h->green_metadata_type = get_bits(gb, 8);
374
375
    if (h->green_metadata_type == 0) {
376
        h->period_type = get_bits(gb, 8);
377
378
        if (h->period_type == 2)
379
            h->num_seconds = get_bits(gb, 16);
380
        else if (h->period_type == 3)
381
            h->num_pictures = get_bits(gb, 16);
382
383
        h->percent_non_zero_macroblocks            = get_bits(gb, 8);
384
        h->percent_intra_coded_macroblocks         = get_bits(gb, 8);
385
        h->percent_six_tap_filtering               = get_bits(gb, 8);
386
        h->percent_alpha_point_deblocking_instance = get_bits(gb, 8);
387
388
    } else if (h->green_metadata_type == 1) {
389
        h->xsd_metric_type  = get_bits(gb, 8);
390
        h->xsd_metric_value = get_bits(gb, 16);
391
    }
392
393
    return 0;
394
}
395
396
static int decode_alternative_transfer(H264SEIAlternativeTransfer *h,
397
                                       GetBitContext *gb)
398
{
399
    h->present = 1;
400
    h->preferred_transfer_characteristics = get_bits(gb, 8);
401
    return 0;
402
}
403
404
4038
int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
405
                       const H264ParamSets *ps, void *logctx)
406
{
407
4038
    int master_ret = 0;
408
409

9386
    while (get_bits_left(gb) > 16 && show_bits(gb, 16)) {
410
5355
        int type = 0;
411
5355
        unsigned size = 0;
412
        unsigned next;
413
5355
        int ret  = 0;
414
415
        do {
416
5379
            if (get_bits_left(gb) < 8)
417
                return AVERROR_INVALIDDATA;
418
5379
            type += show_bits(gb, 8);
419
5379
        } while (get_bits(gb, 8) == 255);
420
421
        do {
422
5511
            if (get_bits_left(gb) < 8)
423
                return AVERROR_INVALIDDATA;
424
5511
            size += show_bits(gb, 8);
425
5511
        } while (get_bits(gb, 8) == 255);
426
427
5355
        if (size > get_bits_left(gb) / 8) {
428
7
            av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
429
                   type, 8*size, get_bits_left(gb));
430
7
            return AVERROR_INVALIDDATA;
431
        }
432
5348
        next = get_bits_count(gb) + 8 * size;
433
434


5348
        switch (type) {
435
3412
        case H264_SEI_TYPE_PIC_TIMING: // Picture timing SEI
436
3412
            ret = decode_picture_timing(&h->picture_timing, gb, ps, logctx);
437
3412
            break;
438
645
        case H264_SEI_TYPE_USER_DATA_REGISTERED:
439
645
            ret = decode_registered_user_data(h, gb, logctx, size);
440
645
            break;
441
248
        case H264_SEI_TYPE_USER_DATA_UNREGISTERED:
442
248
            ret = decode_unregistered_user_data(&h->unregistered, gb, logctx, size);
443
248
            break;
444
54
        case H264_SEI_TYPE_RECOVERY_POINT:
445
54
            ret = decode_recovery_point(&h->recovery_point, gb, logctx);
446
54
            break;
447
736
        case H264_SEI_TYPE_BUFFERING_PERIOD:
448
736
            ret = decode_buffering_period(&h->buffering_period, gb, ps, logctx);
449
736
            break;
450
        case H264_SEI_TYPE_FRAME_PACKING:
451
            ret = decode_frame_packing_arrangement(&h->frame_packing, gb);
452
            break;
453
2
        case H264_SEI_TYPE_DISPLAY_ORIENTATION:
454
2
            ret = decode_display_orientation(&h->display_orientation, gb);
455
2
            break;
456
        case H264_SEI_TYPE_GREEN_METADATA:
457
            ret = decode_green_metadata(&h->green_metadata, gb);
458
            break;
459
        case H264_SEI_TYPE_ALTERNATIVE_TRANSFER:
460
            ret = decode_alternative_transfer(&h->alternative_transfer, gb);
461
            break;
462
251
        default:
463
251
            av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
464
        }
465

5348
        if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
466
            return ret;
467
5348
        if (ret < 0)
468
56
            master_ret = ret;
469
470
5348
        skip_bits_long(gb, next - get_bits_count(gb));
471
472
        // FIXME check bits here
473
5348
        align_get_bits(gb);
474
    }
475
476
4031
    return master_ret;
477
}
478
479
22150
const char *ff_h264_sei_stereo_mode(const H264SEIFramePacking *h)
480
{
481
22150
    if (h->arrangement_cancel_flag == 0) {
482
        switch (h->arrangement_type) {
483
            case H264_SEI_FPA_TYPE_CHECKERBOARD:
484
                if (h->content_interpretation_type == 2)
485
                    return "checkerboard_rl";
486
                else
487
                    return "checkerboard_lr";
488
            case H264_SEI_FPA_TYPE_INTERLEAVE_COLUMN:
489
                if (h->content_interpretation_type == 2)
490
                    return "col_interleaved_rl";
491
                else
492
                    return "col_interleaved_lr";
493
            case H264_SEI_FPA_TYPE_INTERLEAVE_ROW:
494
                if (h->content_interpretation_type == 2)
495
                    return "row_interleaved_rl";
496
                else
497
                    return "row_interleaved_lr";
498
            case H264_SEI_FPA_TYPE_SIDE_BY_SIDE:
499
                if (h->content_interpretation_type == 2)
500
                    return "right_left";
501
                else
502
                    return "left_right";
503
            case H264_SEI_FPA_TYPE_TOP_BOTTOM:
504
                if (h->content_interpretation_type == 2)
505
                    return "bottom_top";
506
                else
507
                    return "top_bottom";
508
            case H264_SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
509
                if (h->content_interpretation_type == 2)
510
                    return "block_rl";
511
                else
512
                    return "block_lr";
513
            case H264_SEI_FPA_TYPE_2D:
514
            default:
515
                return "mono";
516
        }
517
22150
    } else if (h->arrangement_cancel_flag == 1) {
518
        return "mono";
519
    } else {
520
22150
        return NULL;
521
    }
522
}