2 * H.26L/H.264/AVC/JVT/14496-10/... SEI decoding
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
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.
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.
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
24 * H.264 / AVC / MPEG-4 part10 SEI decoding.
25 * @author Michael Niedermayer <michaelni@gmx.at>
35 #define AVERROR_PS_NOT_FOUND FFERRTAG(0xF8,'?','P','S')
37 static const uint8_t sei_num_clock_ts_table[9] = {
38 1, 1, 1, 2, 2, 3, 3, 2, 3
41 void ff_h264_sei_uninit(H264SEIContext *h)
43 h->recovery_point.recovery_frame_cnt = -1;
45 h->picture_timing.dpb_output_delay = 0;
46 h->picture_timing.cpb_removal_delay = -1;
48 h->picture_timing.present = 0;
49 h->buffering_period.present = 0;
50 h->frame_packing.present = 0;
51 h->display_orientation.present = 0;
54 av_buffer_unref(&h->a53_caption.buf_ref);
55 for (int i = 0; i < h->unregistered.nb_buf_ref; i++)
56 av_buffer_unref(&h->unregistered.buf_ref[i]);
57 h->unregistered.nb_buf_ref = 0;
58 av_freep(&h->unregistered.buf_ref);
61 int ff_h264_sei_process_picture_timing(H264SEIPictureTiming *h, const SPS *sps,
66 init_get_bits(&gb, h->payload, h->payload_size_bits);
68 if (sps->nal_hrd_parameters_present_flag ||
69 sps->vcl_hrd_parameters_present_flag) {
70 h->cpb_removal_delay = get_bits_long(&gb, sps->cpb_removal_delay_length);
71 h->dpb_output_delay = get_bits_long(&gb, sps->dpb_output_delay_length);
73 if (sps->pic_struct_present_flag) {
74 unsigned int i, num_clock_ts;
76 h->pic_struct = get_bits(&gb, 4);
79 if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
80 return AVERROR_INVALIDDATA;
82 num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
84 for (i = 0; i < num_clock_ts; i++) {
85 if (get_bits(&gb, 1)) { /* clock_timestamp_flag */
86 H264SEITimeCode *tc = &h->timecode[h->timecode_cnt++];
87 unsigned int full_timestamp_flag;
88 unsigned int counting_type, cnt_dropped_flag;
89 h->ct_type |= 1 << get_bits(&gb, 2);
90 skip_bits(&gb, 1); /* nuit_field_based_flag */
91 counting_type = get_bits(&gb, 5); /* counting_type */
92 full_timestamp_flag = get_bits(&gb, 1);
93 skip_bits(&gb, 1); /* discontinuity_flag */
94 cnt_dropped_flag = get_bits(&gb, 1); /* cnt_dropped_flag */
95 if (cnt_dropped_flag && counting_type > 1 && counting_type < 7)
97 tc->frame = get_bits(&gb, 8); /* n_frames */
98 if (full_timestamp_flag) {
100 tc->seconds = get_bits(&gb, 6); /* seconds_value 0..59 */
101 tc->minutes = get_bits(&gb, 6); /* minutes_value 0..59 */
102 tc->hours = get_bits(&gb, 5); /* hours_value 0..23 */
104 tc->seconds = tc->minutes = tc->hours = tc->full = 0;
105 if (get_bits(&gb, 1)) { /* seconds_flag */
106 tc->seconds = get_bits(&gb, 6);
107 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);
115 if (sps->time_offset_length > 0)
117 sps->time_offset_length); /* time_offset */
121 av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
122 h->ct_type, h->pic_struct);
128 static int decode_picture_timing(H264SEIPictureTiming *h, GetBitContext *gb,
131 int index = get_bits_count(gb);
132 int size_bits = get_bits_left(gb);
133 int size = (size_bits + 7) / 8;
136 av_log(logctx, AV_LOG_ERROR, "Unaligned SEI payload\n");
137 return AVERROR_INVALIDDATA;
139 if (size > sizeof(h->payload)) {
140 av_log(logctx, AV_LOG_ERROR, "Picture timing SEI payload too large\n");
141 return AVERROR_INVALIDDATA;
143 memcpy(h->payload, gb->buffer + index / 8, size);
145 h->payload_size_bits = size_bits;
151 static int decode_registered_user_data_afd(H264SEIAFD *h, GetBitContext *gb, int size)
156 return AVERROR_INVALIDDATA;
157 skip_bits(gb, 1); // 0
158 flag = get_bits(gb, 1); // active_format_flag
159 skip_bits(gb, 6); // reserved
163 return AVERROR_INVALIDDATA;
164 skip_bits(gb, 4); // reserved
165 h->active_format_description = get_bits(gb, 4);
172 static int decode_registered_user_data_closed_caption(H264SEIA53Caption *h,
173 GetBitContext *gb, void *logctx,
177 int user_data_type_code;
181 return AVERROR(EINVAL);
183 user_data_type_code = get_bits(gb, 8);
184 if (user_data_type_code == 0x3) {
185 skip_bits(gb, 1); // reserved
187 flag = get_bits(gb, 1); // process_cc_data_flag
189 skip_bits(gb, 1); // zero bit
190 cc_count = get_bits(gb, 5);
191 skip_bits(gb, 8); // reserved
194 if (cc_count && size >= cc_count * 3) {
195 int old_size = h->buf_ref ? h->buf_ref->size : 0;
196 const uint64_t new_size = (old_size + cc_count
200 if (new_size > INT_MAX)
201 return AVERROR(EINVAL);
203 /* Allow merging of the cc data from two fields. */
204 ret = av_buffer_realloc(&h->buf_ref, new_size);
208 /* Use of av_buffer_realloc assumes buffer is writeable */
209 for (i = 0; i < cc_count; i++) {
210 h->buf_ref->data[old_size++] = get_bits(gb, 8);
211 h->buf_ref->data[old_size++] = get_bits(gb, 8);
212 h->buf_ref->data[old_size++] = get_bits(gb, 8);
215 skip_bits(gb, 8); // marker_bits
220 for (i = 0; i < size - 1; i++)
227 static int decode_registered_user_data(H264SEIContext *h, GetBitContext *gb,
228 void *logctx, int size)
230 uint32_t country_code;
231 uint32_t user_identifier;
234 return AVERROR_INVALIDDATA;
237 country_code = get_bits(gb, 8); // itu_t_t35_country_code
238 if (country_code == 0xFF) {
239 skip_bits(gb, 8); // itu_t_t35_country_code_extension_byte
243 /* itu_t_t35_payload_byte follows */
244 skip_bits(gb, 8); // terminal provider code
245 skip_bits(gb, 8); // terminal provider oriented code
246 user_identifier = get_bits_long(gb, 32);
248 switch (user_identifier) {
249 case MKBETAG('D', 'T', 'G', '1'): // afd_data
250 return decode_registered_user_data_afd(&h->afd, gb, size);
251 case MKBETAG('G', 'A', '9', '4'): // closed captions
252 return decode_registered_user_data_closed_caption(&h->a53_caption, gb,
255 skip_bits(gb, size * 8);
262 static int decode_unregistered_user_data(H264SEIUnregistered *h, GetBitContext *gb,
263 void *logctx, int size)
267 AVBufferRef *buf_ref, **tmp;
269 if (size < 16 || size >= INT_MAX - 1)
270 return AVERROR_INVALIDDATA;
272 tmp = av_realloc_array(h->buf_ref, h->nb_buf_ref + 1, sizeof(*h->buf_ref));
274 return AVERROR(ENOMEM);
277 buf_ref = av_buffer_alloc(size + 1);
279 return AVERROR(ENOMEM);
280 user_data = buf_ref->data;
282 for (i = 0; i < size; i++)
283 user_data[i] = get_bits(gb, 8);
286 buf_ref->size = size;
287 h->buf_ref[h->nb_buf_ref++] = buf_ref;
289 e = sscanf(user_data + 16, "x264 - core %d", &build);
290 if (e == 1 && build > 0)
291 h->x264_build = build;
292 if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
298 static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb, void *logctx)
300 unsigned recovery_frame_cnt = get_ue_golomb_long(gb);
302 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;
307 h->recovery_frame_cnt = recovery_frame_cnt;
308 /* 1b exact_match_flag,
309 * 1b broken_link_flag,
310 * 2b changing_slice_group_idc */
316 static int decode_buffering_period(H264SEIBufferingPeriod *h, GetBitContext *gb,
317 const H264ParamSets *ps, void *logctx)
323 sps_id = get_ue_golomb_31(gb);
324 if (sps_id > 31 || !ps->sps_list[sps_id]) {
325 av_log(logctx, AV_LOG_ERROR,
326 "non-existing SPS %d referenced in buffering period\n", sps_id);
327 return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
329 sps = (const SPS*)ps->sps_list[sps_id]->data;
331 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
332 if (sps->nal_hrd_parameters_present_flag) {
333 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
334 h->initial_cpb_removal_delay[sched_sel_idx] =
335 get_bits_long(gb, sps->initial_cpb_removal_delay_length);
336 // initial_cpb_removal_delay_offset
337 skip_bits(gb, sps->initial_cpb_removal_delay_length);
340 if (sps->vcl_hrd_parameters_present_flag) {
341 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
342 h->initial_cpb_removal_delay[sched_sel_idx] =
343 get_bits_long(gb, sps->initial_cpb_removal_delay_length);
344 // initial_cpb_removal_delay_offset
345 skip_bits(gb, sps->initial_cpb_removal_delay_length);
353 static int decode_frame_packing_arrangement(H264SEIFramePacking *h,
356 h->arrangement_id = get_ue_golomb_long(gb);
357 h->arrangement_cancel_flag = get_bits1(gb);
358 h->present = !h->arrangement_cancel_flag;
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);
365 // spatial_flipping_flag, frame0_flipped_flag, field_views_flag
367 h->current_frame_is_frame0_flag = get_bits1(gb);
368 // frame0_self_contained_flag, frame1_self_contained_flag
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);
376 skip_bits1(gb); // frame_packing_arrangement_extension_flag
381 static int decode_display_orientation(H264SEIDisplayOrientation *h,
384 h->present = !get_bits1(gb);
387 h->hflip = get_bits1(gb); // hor_flip
388 h->vflip = get_bits1(gb); // ver_flip
390 h->anticlockwise_rotation = get_bits(gb, 16);
391 get_ue_golomb_long(gb); // display_orientation_repetition_period
392 skip_bits1(gb); // display_orientation_extension_flag
398 static int decode_green_metadata(H264SEIGreenMetaData *h, GetBitContext *gb)
400 h->green_metadata_type = get_bits(gb, 8);
402 if (h->green_metadata_type == 0) {
403 h->period_type = get_bits(gb, 8);
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);
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);
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);
423 static int decode_alternative_transfer(H264SEIAlternativeTransfer *h,
427 h->preferred_transfer_characteristics = get_bits(gb, 8);
431 int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
432 const H264ParamSets *ps, void *logctx)
436 while (get_bits_left(gb) > 16 && show_bits(gb, 16)) {
437 GetBitContext gb_payload;
443 if (get_bits_left(gb) < 8)
444 return AVERROR_INVALIDDATA;
445 type += show_bits(gb, 8);
446 } while (get_bits(gb, 8) == 255);
449 if (get_bits_left(gb) < 8)
450 return AVERROR_INVALIDDATA;
451 size += show_bits(gb, 8);
452 } while (get_bits(gb, 8) == 255);
454 if (size > get_bits_left(gb) / 8) {
455 av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
456 type, 8*size, get_bits_left(gb));
457 return AVERROR_INVALIDDATA;
460 ret = init_get_bits8(&gb_payload, gb->buffer + get_bits_count(gb) / 8, size);
465 case H264_SEI_TYPE_PIC_TIMING: // Picture timing SEI
466 ret = decode_picture_timing(&h->picture_timing, &gb_payload, logctx);
468 case H264_SEI_TYPE_USER_DATA_REGISTERED:
469 ret = decode_registered_user_data(h, &gb_payload, logctx, size);
471 case H264_SEI_TYPE_USER_DATA_UNREGISTERED:
472 ret = decode_unregistered_user_data(&h->unregistered, &gb_payload, logctx, size);
474 case H264_SEI_TYPE_RECOVERY_POINT:
475 ret = decode_recovery_point(&h->recovery_point, &gb_payload, logctx);
477 case H264_SEI_TYPE_BUFFERING_PERIOD:
478 ret = decode_buffering_period(&h->buffering_period, &gb_payload, ps, logctx);
480 case H264_SEI_TYPE_FRAME_PACKING:
481 ret = decode_frame_packing_arrangement(&h->frame_packing, &gb_payload);
483 case H264_SEI_TYPE_DISPLAY_ORIENTATION:
484 ret = decode_display_orientation(&h->display_orientation, &gb_payload);
486 case H264_SEI_TYPE_GREEN_METADATA:
487 ret = decode_green_metadata(&h->green_metadata, &gb_payload);
489 case H264_SEI_TYPE_ALTERNATIVE_TRANSFER:
490 ret = decode_alternative_transfer(&h->alternative_transfer, &gb_payload);
493 av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
495 if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
500 if (get_bits_left(&gb_payload) < 0) {
501 av_log(logctx, AV_LOG_WARNING, "SEI type %d overread by %d bits\n",
502 type, -get_bits_left(&gb_payload));
505 skip_bits_long(gb, 8 * size);
511 const char *ff_h264_sei_stereo_mode(const H264SEIFramePacking *h)
513 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";
519 return "checkerboard_lr";
520 case H264_SEI_FPA_TYPE_INTERLEAVE_COLUMN:
521 if (h->content_interpretation_type == 2)
522 return "col_interleaved_rl";
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";
529 return "row_interleaved_lr";
530 case H264_SEI_FPA_TYPE_SIDE_BY_SIDE:
531 if (h->content_interpretation_type == 2)
535 case H264_SEI_FPA_TYPE_TOP_BOTTOM:
536 if (h->content_interpretation_type == 2)
540 case H264_SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
541 if (h->content_interpretation_type == 2)
545 case H264_SEI_FPA_TYPE_2D:
549 } else if (h->arrangement_cancel_flag == 1) {