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 static int decode_frame_packing(H264Context *h, int size){
208 int bits = get_bits_left(&h->gb);
210 h->sei_fpa.frame_packing_arrangement_id = get_ue_golomb(&h->gb);
211 h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits(&h->gb, 1);
212 if (!h->sei_fpa.frame_packing_arrangement_cancel_flag) {
213 h->sei_fpa.frame_packing_arrangement_type = get_bits(&h->gb, 7);
214 h->sei_fpa.quincunx_sampling_flag = get_bits(&h->gb, 1);
215 h->sei_fpa.content_interpretation_type = get_bits(&h->gb, 6);
216 skip_bits(&h->gb, 1); /* spatial_flipping_flag */
217 skip_bits(&h->gb, 1); /* frame0_flipped_flag */
218 skip_bits(&h->gb, 1); /* field_views_flag */
219 skip_bits(&h->gb, 1); /* current_frame_is_frame0_flag */
220 skip_bits(&h->gb, 1); /* frame0_self_contained_flag */
221 skip_bits(&h->gb, 1); /* frame1_self_contained_flag */
222 if (!h->sei_fpa.quincunx_sampling_flag && h->sei_fpa.frame_packing_arrangement_type != 5) {
223 skip_bits(&h->gb, 4); /* frame0_grid_position_x */
224 skip_bits(&h->gb, 4); /* frame0_grid_position_y */
225 skip_bits(&h->gb, 4); /* frame1_grid_position_x */
226 skip_bits(&h->gb, 4); /* frame1_grid_position_y */
228 skip_bits(&h->gb, 8); /* frame_packing_arrangement_reserved_byte */
229 h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
231 skip_bits(&h->gb, 1); /* frame_packing_arrangement_extension_flag */
233 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
234 av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
235 h->sei_fpa.frame_packing_arrangement_id,
236 h->sei_fpa.frame_packing_arrangement_cancel_flag,
237 h->sei_fpa.frame_packing_arrangement_type,
238 h->sei_fpa.quincunx_sampling_flag,
239 h->sei_fpa.content_interpretation_type,
240 h->sei_fpa.frame_packing_arrangement_repetition_period);
241 skip_bits_long(&h->gb, 8*size - (bits - get_bits_left(&h->gb)));
245 int ff_h264_decode_sei(H264Context *h){
246 while (get_bits_left(&h->gb) > 16) {
252 if (get_bits_left(&h->gb) < 8)
253 return AVERROR_INVALIDDATA;
254 type+= show_bits(&h->gb, 8);
255 }while(get_bits(&h->gb, 8) == 255);
259 if (get_bits_left(&h->gb) < 8)
260 return AVERROR_INVALIDDATA;
261 size+= show_bits(&h->gb, 8);
262 }while(get_bits(&h->gb, 8) == 255);
264 if(h->avctx->debug&FF_DEBUG_STARTCODE)
265 av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
267 if (size > get_bits_left(&h->gb) / 8) {
268 av_log(h->avctx, AV_LOG_ERROR, "SEI truncated\n");
269 return AVERROR_INVALIDDATA;
271 next = get_bits_count(&h->gb) + 8*size;
274 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
275 if(decode_picture_timing(h) < 0)
278 case SEI_TYPE_USER_DATA_ITU_T_T35:
279 if(decode_user_data_itu_t_t35(h, size) < 0)
282 case SEI_TYPE_USER_DATA_UNREGISTERED:
283 if(decode_unregistered_user_data(h, size) < 0)
286 case SEI_TYPE_RECOVERY_POINT:
287 if(decode_recovery_point(h) < 0)
290 case SEI_BUFFERING_PERIOD:
291 if(decode_buffering_period(h) < 0)
294 case SEI_TYPE_FRAME_PACKING:
295 if(decode_frame_packing(h, size) < 0)
298 skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
300 //FIXME check bits here
301 align_get_bits(&h->gb);
307 const char* ff_h264_sei_stereo_mode(H264Context *h)
309 if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 0) {
310 switch (h->sei_fpa.frame_packing_arrangement_type) {
311 case SEI_FPA_TYPE_CHECKERBOARD:
312 if (h->sei_fpa.content_interpretation_type == 2)
313 return "checkerboard_rl";
315 return "checkerboard_lr";
316 case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
317 if (h->sei_fpa.content_interpretation_type == 2)
318 return "col_interleaved_rl";
320 return "col_interleaved_lr";
321 case SEI_FPA_TYPE_INTERLEAVE_ROW:
322 if (h->sei_fpa.content_interpretation_type == 2)
323 return "row_interleaved_rl";
325 return "row_interleaved_lr";
326 case SEI_FPA_TYPE_SIDE_BY_SIDE:
327 if (h->sei_fpa.content_interpretation_type == 2)
331 case SEI_FPA_TYPE_TOP_BOTTOM:
332 if (h->sei_fpa.content_interpretation_type == 2)
336 case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
337 if (h->sei_fpa.content_interpretation_type == 2)
341 case SEI_FPA_TYPE_2D:
345 } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {