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>
36 static const uint8_t sei_num_clock_ts_table[9]={
37 1, 1, 1, 2, 2, 3, 3, 2, 3
40 void ff_h264_reset_sei(H264Context *h) {
41 h->sei_recovery_frame_cnt = -1;
42 h->sei_dpb_output_delay = 0;
43 h->sei_cpb_removal_delay = -1;
44 h->sei_buffering_period_present = 0;
47 static int decode_picture_timing(H264Context *h){
51 for (i = 0; i<MAX_SPS_COUNT; i++)
52 if (!sps->log2_max_frame_num && h->sps_buffers[i])
53 sps = h->sps_buffers[i];
55 if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag){
56 h->sei_cpb_removal_delay = get_bits_long(&h->gb, sps->cpb_removal_delay_length);
57 h->sei_dpb_output_delay = get_bits_long(&h->gb, sps->dpb_output_delay_length);
59 if(sps->pic_struct_present_flag){
60 unsigned int i, num_clock_ts;
61 h->sei_pic_struct = get_bits(&h->gb, 4);
64 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
67 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
69 for (i = 0 ; i < num_clock_ts ; i++){
70 if(get_bits(&h->gb, 1)){ /* clock_timestamp_flag */
71 unsigned int full_timestamp_flag;
72 h->sei_ct_type |= 1<<get_bits(&h->gb, 2);
73 skip_bits(&h->gb, 1); /* nuit_field_based_flag */
74 skip_bits(&h->gb, 5); /* counting_type */
75 full_timestamp_flag = get_bits(&h->gb, 1);
76 skip_bits(&h->gb, 1); /* discontinuity_flag */
77 skip_bits(&h->gb, 1); /* cnt_dropped_flag */
78 skip_bits(&h->gb, 8); /* n_frames */
79 if(full_timestamp_flag){
80 skip_bits(&h->gb, 6); /* seconds_value 0..59 */
81 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
82 skip_bits(&h->gb, 5); /* hours_value 0..23 */
84 if(get_bits(&h->gb, 1)){ /* seconds_flag */
85 skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
86 if(get_bits(&h->gb, 1)){ /* minutes_flag */
87 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
88 if(get_bits(&h->gb, 1)) /* hours_flag */
89 skip_bits(&h->gb, 5); /* hours_value 0..23 */
93 if(sps->time_offset_length > 0)
94 skip_bits(&h->gb, sps->time_offset_length); /* time_offset */
98 if(h->avctx->debug & FF_DEBUG_PICT_INFO)
99 av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n", h->sei_ct_type, h->sei_pic_struct);
104 static int decode_user_data_itu_t_t35(H264Context *h, int size) {
105 uint32_t user_identifier;
106 int dtg_active_format;
112 skip_bits(&h->gb, 8); // country_code
113 skip_bits(&h->gb, 16); // provider_code
114 user_identifier = get_bits_long(&h->gb, 32);
116 switch (user_identifier) {
117 case 0x44544731: // "DTG1" - AFD_data
120 skip_bits(&h->gb, 1);
121 if (get_bits(&h->gb, 1)) {
122 skip_bits(&h->gb, 6);
125 skip_bits(&h->gb, 4);
126 dtg_active_format = get_bits(&h->gb, 4);
127 h->avctx->dtg_active_format = dtg_active_format;
129 skip_bits(&h->gb, 6);
133 skip_bits(&h->gb, size * 8);
140 static int decode_unregistered_user_data(H264Context *h, int size){
141 uint8_t user_data[16+256];
147 for(i=0; i<sizeof(user_data)-1 && i<size; i++){
148 user_data[i]= get_bits(&h->gb, 8);
152 e= sscanf(user_data+16, "x264 - core %d"/*%s - H.264/MPEG-4 AVC codec - Copyleft 2005 - http://www.videolan.org/x264.html*/, &build);
154 h->x264_build= build;
155 if(e==1 && build==1 && !strncmp(user_data+16, "x264 - core 0000", 16))
158 if(h->avctx->debug & FF_DEBUG_BUGS)
159 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data+16);
162 skip_bits(&h->gb, 8);
167 static int decode_recovery_point(H264Context *h){
168 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
169 skip_bits(&h->gb, 4); /* 1b exact_match_flag, 1b broken_link_flag, 2b changing_slice_group_idc */
171 if(h->avctx->debug & FF_DEBUG_PICT_INFO)
172 av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);
177 static int decode_buffering_period(H264Context *h){
182 sps_id = get_ue_golomb_31(&h->gb);
183 if(sps_id > 31 || !h->sps_buffers[sps_id]) {
184 av_log(h->avctx, AV_LOG_ERROR, "non-existing SPS %d referenced in buffering period\n", sps_id);
187 sps = h->sps_buffers[sps_id];
189 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
190 if (sps->nal_hrd_parameters_present_flag) {
191 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
192 h->initial_cpb_removal_delay[sched_sel_idx] = get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
193 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
196 if (sps->vcl_hrd_parameters_present_flag) {
197 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
198 h->initial_cpb_removal_delay[sched_sel_idx] = get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
199 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
203 h->sei_buffering_period_present = 1;
207 int ff_h264_decode_sei(H264Context *h){
208 while (get_bits_left(&h->gb) > 16) {
213 if (get_bits_left(&h->gb) < 8)
215 type+= show_bits(&h->gb, 8);
216 }while(get_bits(&h->gb, 8) == 255);
220 if (get_bits_left(&h->gb) < 8)
222 size+= show_bits(&h->gb, 8);
223 }while(get_bits(&h->gb, 8) == 255);
225 if(h->avctx->debug&FF_DEBUG_STARTCODE)
226 av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
229 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
230 if(decode_picture_timing(h) < 0)
233 case SEI_TYPE_USER_DATA_ITU_T_T35:
234 if(decode_user_data_itu_t_t35(h, size) < 0)
237 case SEI_TYPE_USER_DATA_UNREGISTERED:
238 if(decode_unregistered_user_data(h, size) < 0)
241 case SEI_TYPE_RECOVERY_POINT:
242 if(decode_recovery_point(h) < 0)
245 case SEI_BUFFERING_PERIOD:
246 if(decode_buffering_period(h) < 0)
250 skip_bits(&h->gb, 8*size);
253 //FIXME check bits here
254 align_get_bits(&h->gb);