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 / MPEG4 part10 sei decoding.
25 * @author Michael Niedermayer <michaelni@gmx.at>
35 static const uint8_t sei_num_clock_ts_table[9] = {
36 1, 1, 1, 2, 2, 3, 3, 2, 3
39 void ff_h264_sei_uninit(H264SEIContext *h)
41 h->recovery_point.recovery_frame_cnt = -1;
43 h->picture_timing.dpb_output_delay = 0;
44 h->picture_timing.cpb_removal_delay = -1;
46 h->buffering_period.present = 0;
47 h->frame_packing.present = 0;
48 h->display_orientation.present = 0;
51 h->a53_caption.a53_caption_size = 0;
52 av_freep(&h->a53_caption.a53_caption);
55 static int decode_picture_timing(H264SEIPictureTiming *h, GetBitContext *gb,
56 const H264ParamSets *ps, void *logctx)
59 const SPS *sps = ps->sps;
61 for (i = 0; i<MAX_SPS_COUNT; i++)
62 if ((!sps || !sps->log2_max_frame_num) && ps->sps_list[i])
63 sps = (const SPS *)ps->sps_list[i]->data;
66 av_log(logctx, AV_LOG_ERROR, "SPS unavailable in decode_picture_timing\n");
70 if (sps->nal_hrd_parameters_present_flag ||
71 sps->vcl_hrd_parameters_present_flag) {
72 h->cpb_removal_delay = get_bits_long(gb, sps->cpb_removal_delay_length);
73 h->dpb_output_delay = get_bits_long(gb, sps->dpb_output_delay_length);
75 if (sps->pic_struct_present_flag) {
76 unsigned int i, num_clock_ts;
78 h->pic_struct = get_bits(gb, 4);
81 if (h->pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
82 return AVERROR_INVALIDDATA;
84 num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
86 for (i = 0; i < num_clock_ts; i++) {
87 if (get_bits(gb, 1)) { /* clock_timestamp_flag */
88 unsigned int full_timestamp_flag;
90 h->ct_type |= 1 << get_bits(gb, 2);
91 skip_bits(gb, 1); /* nuit_field_based_flag */
92 skip_bits(gb, 5); /* counting_type */
93 full_timestamp_flag = get_bits(gb, 1);
94 skip_bits(gb, 1); /* discontinuity_flag */
95 skip_bits(gb, 1); /* cnt_dropped_flag */
96 skip_bits(gb, 8); /* n_frames */
97 if (full_timestamp_flag) {
98 skip_bits(gb, 6); /* seconds_value 0..59 */
99 skip_bits(gb, 6); /* minutes_value 0..59 */
100 skip_bits(gb, 5); /* hours_value 0..23 */
102 if (get_bits(gb, 1)) { /* seconds_flag */
103 skip_bits(gb, 6); /* seconds_value range 0..59 */
104 if (get_bits(gb, 1)) { /* minutes_flag */
105 skip_bits(gb, 6); /* minutes_value 0..59 */
106 if (get_bits(gb, 1)) /* hours_flag */
107 skip_bits(gb, 5); /* hours_value 0..23 */
111 if (sps->time_offset_length > 0)
113 sps->time_offset_length); /* time_offset */
117 av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
118 h->ct_type, h->pic_struct);
123 static int decode_registered_user_data_afd(H264SEIAFD *h, GetBitContext *gb, int size)
128 return AVERROR_INVALIDDATA;
129 skip_bits(gb, 1); // 0
130 flag = get_bits(gb, 1); // active_format_flag
131 skip_bits(gb, 6); // reserved
135 return AVERROR_INVALIDDATA;
136 skip_bits(gb, 4); // reserved
137 h->active_format_description = get_bits(gb, 4);
144 static int decode_registered_user_data_closed_caption(H264SEIA53Caption *h,
145 GetBitContext *gb, void *logctx,
149 int user_data_type_code;
153 return AVERROR(EINVAL);
155 user_data_type_code = get_bits(gb, 8);
156 if (user_data_type_code == 0x3) {
157 skip_bits(gb, 1); // reserved
159 flag = get_bits(gb, 1); // process_cc_data_flag
161 skip_bits(gb, 1); // zero bit
162 cc_count = get_bits(gb, 5);
163 skip_bits(gb, 8); // reserved
166 if (cc_count && size >= cc_count * 3) {
167 const uint64_t new_size = (h->a53_caption_size + cc_count
171 if (new_size > INT_MAX)
172 return AVERROR(EINVAL);
174 /* Allow merging of the cc data from two fields. */
175 ret = av_reallocp(&h->a53_caption, new_size);
179 for (i = 0; i < cc_count; i++) {
180 h->a53_caption[h->a53_caption_size++] = get_bits(gb, 8);
181 h->a53_caption[h->a53_caption_size++] = get_bits(gb, 8);
182 h->a53_caption[h->a53_caption_size++] = get_bits(gb, 8);
185 skip_bits(gb, 8); // marker_bits
190 for (i = 0; i < size - 1; i++)
197 static int decode_registered_user_data(H264SEIContext *h, GetBitContext *gb,
198 void *logctx, int size)
200 uint32_t country_code;
201 uint32_t user_identifier;
204 return AVERROR_INVALIDDATA;
207 country_code = get_bits(gb, 8); // itu_t_t35_country_code
208 if (country_code == 0xFF) {
209 skip_bits(gb, 8); // itu_t_t35_country_code_extension_byte
213 /* itu_t_t35_payload_byte follows */
214 skip_bits(gb, 8); // terminal provider code
215 skip_bits(gb, 8); // terminal provider oriented code
216 user_identifier = get_bits_long(gb, 32);
218 switch (user_identifier) {
219 case MKBETAG('D', 'T', 'G', '1'): // afd_data
220 return decode_registered_user_data_afd(&h->afd, gb, size);
221 case MKBETAG('G', 'A', '9', '4'): // closed captions
222 return decode_registered_user_data_closed_caption(&h->a53_caption, gb,
225 skip_bits(gb, size * 8);
232 static int decode_unregistered_user_data(H264SEIUnregistered *h, GetBitContext *gb,
233 void *logctx, int size)
238 if (size < 16 || size >= INT_MAX - 16)
239 return AVERROR_INVALIDDATA;
241 user_data = av_malloc(16 + size + 1);
243 return AVERROR(ENOMEM);
245 for (i = 0; i < size + 16; i++)
246 user_data[i] = get_bits(gb, 8);
249 e = sscanf(user_data + 16, "x264 - core %d", &build);
250 if (e == 1 && build > 0)
251 h->x264_build = build;
252 if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
255 if (strlen(user_data + 16) > 0)
256 av_log(logctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
262 static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb)
264 h->recovery_frame_cnt = get_ue_golomb_long(gb);
266 /* 1b exact_match_flag,
267 * 1b broken_link_flag,
268 * 2b changing_slice_group_idc */
274 static int decode_buffering_period(H264SEIBufferingPeriod *h, GetBitContext *gb,
275 const H264ParamSets *ps, void *logctx)
281 sps_id = get_ue_golomb_31(gb);
282 if (sps_id > 31 || !ps->sps_list[sps_id]) {
283 av_log(logctx, AV_LOG_ERROR,
284 "non-existing SPS %d referenced in buffering period\n", sps_id);
285 return AVERROR_INVALIDDATA;
287 sps = (SPS*)ps->sps_list[sps_id]->data;
289 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
290 if (sps->nal_hrd_parameters_present_flag) {
291 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
292 h->initial_cpb_removal_delay[sched_sel_idx] =
293 get_bits_long(gb, sps->initial_cpb_removal_delay_length);
294 // initial_cpb_removal_delay_offset
295 skip_bits(gb, sps->initial_cpb_removal_delay_length);
298 if (sps->vcl_hrd_parameters_present_flag) {
299 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
300 h->initial_cpb_removal_delay[sched_sel_idx] =
301 get_bits_long(gb, sps->initial_cpb_removal_delay_length);
302 // initial_cpb_removal_delay_offset
303 skip_bits(gb, sps->initial_cpb_removal_delay_length);
311 static int decode_frame_packing_arrangement(H264SEIFramePacking *h,
314 h->frame_packing_arrangement_id = get_ue_golomb_long(gb);
315 h->frame_packing_arrangement_cancel_flag = get_bits1(gb);
316 h->present = !h->frame_packing_arrangement_cancel_flag;
319 h->frame_packing_arrangement_type = get_bits(gb, 7);
320 h->quincunx_sampling_flag = get_bits1(gb);
321 h->content_interpretation_type = get_bits(gb, 6);
323 // the following skips: spatial_flipping_flag, frame0_flipped_flag,
324 // field_views_flag, current_frame_is_frame0_flag,
325 // frame0_self_contained_flag, frame1_self_contained_flag
328 if (!h->quincunx_sampling_flag && h->frame_packing_arrangement_type != 5)
329 skip_bits(gb, 16); // frame[01]_grid_position_[xy]
330 skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte
331 h->frame_packing_arrangement_repetition_period = get_ue_golomb_long(gb);
333 skip_bits1(gb); // frame_packing_arrangement_extension_flag
338 static int decode_display_orientation(H264SEIDisplayOrientation *h,
341 h->present = !get_bits1(gb);
344 h->hflip = get_bits1(gb); // hor_flip
345 h->vflip = get_bits1(gb); // ver_flip
347 h->anticlockwise_rotation = get_bits(gb, 16);
348 get_ue_golomb_long(gb); // display_orientation_repetition_period
349 skip_bits1(gb); // display_orientation_extension_flag
355 static int decode_green_metadata(H264SEIGreenMetaData *h, GetBitContext *gb)
357 h->green_metadata_type = get_bits(gb, 8);
359 if (h->green_metadata_type == 0) {
360 h->period_type = get_bits(gb, 8);
362 if (h->period_type == 2)
363 h->num_seconds = get_bits(gb, 16);
364 else if (h->period_type == 3)
365 h->num_pictures = get_bits(gb, 16);
367 h->percent_non_zero_macroblocks = get_bits(gb, 8);
368 h->percent_intra_coded_macroblocks = get_bits(gb, 8);
369 h->percent_six_tap_filtering = get_bits(gb, 8);
370 h->percent_alpha_point_deblocking_instance = get_bits(gb, 8);
372 } else if (h->green_metadata_type == 1) {
373 h->xsd_metric_type = get_bits(gb, 8);
374 h->xsd_metric_value = get_bits(gb, 16);
380 int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
381 const H264ParamSets *ps, void *logctx)
383 while (get_bits_left(gb) > 16 && show_bits(gb, 16)) {
390 if (get_bits_left(gb) < 8)
391 return AVERROR_INVALIDDATA;
392 type += show_bits(gb, 8);
393 } while (get_bits(gb, 8) == 255);
396 if (get_bits_left(gb) < 8)
397 return AVERROR_INVALIDDATA;
398 size += show_bits(gb, 8);
399 } while (get_bits(gb, 8) == 255);
401 if (size > get_bits_left(gb) / 8) {
402 av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
403 type, 8*size, get_bits_left(gb));
404 return AVERROR_INVALIDDATA;
406 next = get_bits_count(gb) + 8 * size;
409 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
410 ret = decode_picture_timing(&h->picture_timing, gb, ps, logctx);
412 case SEI_TYPE_USER_DATA_REGISTERED:
413 ret = decode_registered_user_data(h, gb, logctx, size);
415 case SEI_TYPE_USER_DATA_UNREGISTERED:
416 ret = decode_unregistered_user_data(&h->unregistered, gb, logctx, size);
418 case SEI_TYPE_RECOVERY_POINT:
419 ret = decode_recovery_point(&h->recovery_point, gb);
421 case SEI_TYPE_BUFFERING_PERIOD:
422 ret = decode_buffering_period(&h->buffering_period, gb, ps, logctx);
424 case SEI_TYPE_FRAME_PACKING:
425 ret = decode_frame_packing_arrangement(&h->frame_packing, gb);
427 case SEI_TYPE_DISPLAY_ORIENTATION:
428 ret = decode_display_orientation(&h->display_orientation, gb);
430 case SEI_TYPE_GREEN_METADATA:
431 ret = decode_green_metadata(&h->green_metadata, gb);
434 av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
439 skip_bits_long(gb, next - get_bits_count(gb));
441 // FIXME check bits here
448 const char *ff_h264_sei_stereo_mode(const H264SEIFramePacking *h)
450 if (h->frame_packing_arrangement_cancel_flag == 0) {
451 switch (h->frame_packing_arrangement_type) {
452 case SEI_FPA_TYPE_CHECKERBOARD:
453 if (h->content_interpretation_type == 2)
454 return "checkerboard_rl";
456 return "checkerboard_lr";
457 case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
458 if (h->content_interpretation_type == 2)
459 return "col_interleaved_rl";
461 return "col_interleaved_lr";
462 case SEI_FPA_TYPE_INTERLEAVE_ROW:
463 if (h->content_interpretation_type == 2)
464 return "row_interleaved_rl";
466 return "row_interleaved_lr";
467 case SEI_FPA_TYPE_SIDE_BY_SIDE:
468 if (h->content_interpretation_type == 2)
472 case SEI_FPA_TYPE_TOP_BOTTOM:
473 if (h->content_interpretation_type == 2)
477 case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
478 if (h->content_interpretation_type == 2)
482 case SEI_FPA_TYPE_2D:
486 } else if (h->frame_packing_arrangement_cancel_flag == 1) {