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>
33 static const uint8_t sei_num_clock_ts_table[9] = {
34 1, 1, 1, 2, 2, 3, 3, 2, 3
37 void ff_h264_reset_sei(H264Context *h)
39 h->sei_recovery_frame_cnt = -1;
40 h->sei_dpb_output_delay = 0;
41 h->sei_cpb_removal_delay = -1;
42 h->sei_buffering_period_present = 0;
43 h->sei_frame_packing_present = 0;
44 h->sei_display_orientation_present = 0;
47 static int decode_picture_timing(H264Context *h)
52 for (i = 0; i<MAX_SPS_COUNT; i++)
53 if (!sps->log2_max_frame_num && h->sps_buffers[i])
54 sps = h->sps_buffers[i];
56 if (sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag) {
57 h->sei_cpb_removal_delay = get_bits_long(&h->gb,
58 sps->cpb_removal_delay_length);
59 h->sei_dpb_output_delay = get_bits_long(&h->gb,
60 sps->dpb_output_delay_length);
62 if (sps->pic_struct_present_flag) {
63 unsigned int i, num_clock_ts;
65 h->sei_pic_struct = get_bits(&h->gb, 4);
68 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
69 return AVERROR_INVALIDDATA;
71 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
73 for (i = 0; i < num_clock_ts; i++) {
74 if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
75 unsigned int full_timestamp_flag;
77 h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
78 skip_bits(&h->gb, 1); /* nuit_field_based_flag */
79 skip_bits(&h->gb, 5); /* counting_type */
80 full_timestamp_flag = get_bits(&h->gb, 1);
81 skip_bits(&h->gb, 1); /* discontinuity_flag */
82 skip_bits(&h->gb, 1); /* cnt_dropped_flag */
83 skip_bits(&h->gb, 8); /* n_frames */
84 if (full_timestamp_flag) {
85 skip_bits(&h->gb, 6); /* seconds_value 0..59 */
86 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
87 skip_bits(&h->gb, 5); /* hours_value 0..23 */
89 if (get_bits(&h->gb, 1)) { /* seconds_flag */
90 skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
91 if (get_bits(&h->gb, 1)) { /* minutes_flag */
92 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
93 if (get_bits(&h->gb, 1)) /* hours_flag */
94 skip_bits(&h->gb, 5); /* hours_value 0..23 */
98 if (sps->time_offset_length > 0)
100 sps->time_offset_length); /* time_offset */
104 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
105 av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
106 h->sei_ct_type, h->sei_pic_struct);
111 static int decode_user_data_itu_t_t35(H264Context *h, int size)
113 uint32_t user_identifier;
114 int dtg_active_format;
120 skip_bits(&h->gb, 8); // country_code
121 skip_bits(&h->gb, 16); // provider_code
122 user_identifier = get_bits_long(&h->gb, 32);
124 switch (user_identifier) {
125 case 0x44544731: // "DTG1" - AFD_data
128 skip_bits(&h->gb, 1);
129 if (get_bits(&h->gb, 1)) {
130 skip_bits(&h->gb, 6);
133 skip_bits(&h->gb, 4);
134 dtg_active_format = get_bits(&h->gb, 4);
135 h->avctx->dtg_active_format = dtg_active_format;
137 skip_bits(&h->gb, 6);
141 skip_bits(&h->gb, size * 8);
148 static int decode_unregistered_user_data(H264Context *h, int size)
150 uint8_t user_data[16 + 256];
154 return AVERROR_INVALIDDATA;
156 for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
157 user_data[i] = get_bits(&h->gb, 8);
160 e = sscanf(user_data + 16, "x264 - core %d", &build);
161 if (e == 1 && build > 0)
162 h->x264_build = build;
163 if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
166 if (h->avctx->debug & FF_DEBUG_BUGS)
167 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
169 for (; i < size; i++)
170 skip_bits(&h->gb, 8);
175 static int decode_recovery_point(H264Context *h)
177 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
179 /* 1b exact_match_flag,
180 * 1b broken_link_flag,
181 * 2b changing_slice_group_idc */
182 skip_bits(&h->gb, 4);
184 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
185 av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);
187 h->has_recovery_point = 1;
192 static int decode_buffering_period(H264Context *h)
198 sps_id = get_ue_golomb_31(&h->gb);
199 if (sps_id > 31 || !h->sps_buffers[sps_id]) {
200 av_log(h->avctx, AV_LOG_ERROR,
201 "non-existing SPS %d referenced in buffering period\n", sps_id);
202 return AVERROR_INVALIDDATA;
204 sps = h->sps_buffers[sps_id];
206 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
207 if (sps->nal_hrd_parameters_present_flag) {
208 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
209 h->initial_cpb_removal_delay[sched_sel_idx] =
210 get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
211 // initial_cpb_removal_delay_offset
212 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
215 if (sps->vcl_hrd_parameters_present_flag) {
216 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
217 h->initial_cpb_removal_delay[sched_sel_idx] =
218 get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
219 // initial_cpb_removal_delay_offset
220 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
224 h->sei_buffering_period_present = 1;
228 static int decode_frame_packing_arrangement(H264Context *h)
230 h->sei_fpa.frame_packing_arrangement_id = get_ue_golomb(&h->gb);
231 h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits1(&h->gb);
232 h->sei_frame_packing_present = !h->sei_fpa.frame_packing_arrangement_cancel_flag;
234 if (h->sei_frame_packing_present) {
235 h->sei_fpa.frame_packing_arrangement_type =
236 h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
237 h->sei_fpa.quincunx_sampling_flag =
238 h->quincunx_subsampling = get_bits1(&h->gb);
239 h->sei_fpa.content_interpretation_type =
240 h->content_interpretation_type = get_bits(&h->gb, 6);
242 // the following skips: spatial_flipping_flag, frame0_flipped_flag,
243 // field_views_flag, current_frame_is_frame0_flag,
244 // frame0_self_contained_flag, frame1_self_contained_flag
245 skip_bits(&h->gb, 6);
247 if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
248 skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
249 skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
250 h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
252 skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
254 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
255 av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
256 h->sei_fpa.frame_packing_arrangement_id,
257 h->sei_fpa.frame_packing_arrangement_cancel_flag,
258 h->sei_fpa.frame_packing_arrangement_type,
259 h->sei_fpa.quincunx_sampling_flag,
260 h->sei_fpa.content_interpretation_type,
261 h->sei_fpa.frame_packing_arrangement_repetition_period);
266 static int decode_display_orientation(H264Context *h)
268 h->sei_display_orientation_present = !get_bits1(&h->gb);
270 if (h->sei_display_orientation_present) {
271 h->sei_hflip = get_bits1(&h->gb); // hor_flip
272 h->sei_vflip = get_bits1(&h->gb); // ver_flip
274 h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
275 get_ue_golomb(&h->gb); // display_orientation_repetition_period
276 skip_bits1(&h->gb); // display_orientation_extension_flag
282 int ff_h264_decode_sei(H264Context *h)
284 while (get_bits_left(&h->gb) > 16 && show_bits(&h->gb, 16)) {
291 if (get_bits_left(&h->gb) < 8)
292 return AVERROR_INVALIDDATA;
293 type += show_bits(&h->gb, 8);
294 } while (get_bits(&h->gb, 8) == 255);
297 if (get_bits_left(&h->gb) < 8)
298 return AVERROR_INVALIDDATA;
299 size += show_bits(&h->gb, 8);
300 } while (get_bits(&h->gb, 8) == 255);
302 if (h->avctx->debug&FF_DEBUG_STARTCODE)
303 av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
305 if (size > get_bits_left(&h->gb) / 8) {
306 av_log(h->avctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
307 type, 8*size, get_bits_left(&h->gb));
308 return AVERROR_INVALIDDATA;
310 next = get_bits_count(&h->gb) + 8 * size;
313 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
314 ret = decode_picture_timing(h);
318 case SEI_TYPE_USER_DATA_ITU_T_T35:
319 if (decode_user_data_itu_t_t35(h, size) < 0)
322 case SEI_TYPE_USER_DATA_UNREGISTERED:
323 ret = decode_unregistered_user_data(h, size);
327 case SEI_TYPE_RECOVERY_POINT:
328 ret = decode_recovery_point(h);
332 case SEI_TYPE_BUFFERING_PERIOD:
333 ret = decode_buffering_period(h);
337 case SEI_TYPE_FRAME_PACKING:
338 ret = decode_frame_packing_arrangement(h);
342 case SEI_TYPE_DISPLAY_ORIENTATION:
343 ret = decode_display_orientation(h);
348 av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
350 skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
352 // FIXME check bits here
353 align_get_bits(&h->gb);
359 const char* ff_h264_sei_stereo_mode(H264Context *h)
361 if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 0) {
362 switch (h->sei_fpa.frame_packing_arrangement_type) {
363 case SEI_FPA_TYPE_CHECKERBOARD:
364 if (h->sei_fpa.content_interpretation_type == 2)
365 return "checkerboard_rl";
367 return "checkerboard_lr";
368 case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
369 if (h->sei_fpa.content_interpretation_type == 2)
370 return "col_interleaved_rl";
372 return "col_interleaved_lr";
373 case SEI_FPA_TYPE_INTERLEAVE_ROW:
374 if (h->sei_fpa.content_interpretation_type == 2)
375 return "row_interleaved_rl";
377 return "row_interleaved_lr";
378 case SEI_FPA_TYPE_SIDE_BY_SIDE:
379 if (h->sei_fpa.content_interpretation_type == 2)
383 case SEI_FPA_TYPE_TOP_BOTTOM:
384 if (h->sei_fpa.content_interpretation_type == 2)
388 case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
389 if (h->sei_fpa.content_interpretation_type == 2)
393 case SEI_FPA_TYPE_2D:
397 } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {