1/* 2 * H.26L/H.264/AVC/JVT/14496-10/... sei decoding 3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> 4 * 5 * This file is part of FFmpeg. 6 * 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. 11 * 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. 16 * 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 20 */ 21 22/** 23 * @file 24 * H.264 / AVC / MPEG4 part10 sei decoding. 25 * @author Michael Niedermayer <michaelni@gmx.at> 26 */ 27 28#include "avcodec.h" 29#include "golomb.h" 30#include "h264.h" 31#include "internal.h" 32 33static const uint8_t sei_num_clock_ts_table[9] = { 34 1, 1, 1, 2, 2, 3, 3, 2, 3 35}; 36 37void ff_h264_reset_sei(H264Context *h) 38{ 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; 45} 46 47static int decode_picture_timing(H264Context *h) 48{ 49 SPS *sps = &h->sps; 50 int i; 51 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]; 55 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); 61 } 62 if (sps->pic_struct_present_flag) { 63 unsigned int i, num_clock_ts; 64 65 h->sei_pic_struct = get_bits(&h->gb, 4); 66 h->sei_ct_type = 0; 67 68 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING) 69 return AVERROR_INVALIDDATA; 70 71 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct]; 72 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; 76 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 */ 88 } else { 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 */ 95 } 96 } 97 } 98 if (sps->time_offset_length > 0) 99 skip_bits(&h->gb, 100 sps->time_offset_length); /* time_offset */ 101 } 102 } 103 104 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); 107 } 108 return 0; 109} 110 111static int decode_user_data_itu_t_t35(H264Context *h, int size) 112{ 113 uint32_t user_identifier; 114 int dtg_active_format; 115 116 if (size < 7) 117 return -1; 118 size -= 7; 119 120 skip_bits(&h->gb, 8); // country_code 121 skip_bits(&h->gb, 16); // provider_code 122 user_identifier = get_bits_long(&h->gb, 32); 123 124 switch (user_identifier) { 125 case 0x44544731: // "DTG1" - AFD_data 126 if (size < 1) 127 return -1; 128 skip_bits(&h->gb, 1); 129 if (get_bits(&h->gb, 1)) { 130 skip_bits(&h->gb, 6); 131 if (size < 2) 132 return -1; 133 skip_bits(&h->gb, 4); 134 dtg_active_format = get_bits(&h->gb, 4); 135 h->avctx->dtg_active_format = dtg_active_format; 136 } else { 137 skip_bits(&h->gb, 6); 138 } 139 break; 140 default: 141 skip_bits(&h->gb, size * 8); 142 break; 143 } 144 145 return 0; 146} 147 148static int decode_unregistered_user_data(H264Context *h, int size) 149{ 150 uint8_t user_data[16 + 256]; 151 int e, build, i; 152 153 if (size < 16) 154 return AVERROR_INVALIDDATA; 155 156 for (i = 0; i < sizeof(user_data) - 1 && i < size; i++) 157 user_data[i] = get_bits(&h->gb, 8); 158 159 user_data[i] = 0; 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)) 164 h->x264_build = 67; 165 166 if (h->avctx->debug & FF_DEBUG_BUGS) 167 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16); 168 169 for (; i < size; i++) 170 skip_bits(&h->gb, 8); 171 172 return 0; 173} 174 175static int decode_recovery_point(H264Context *h) 176{ 177 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb); 178 179 /* 1b exact_match_flag, 180 * 1b broken_link_flag, 181 * 2b changing_slice_group_idc */ 182 skip_bits(&h->gb, 4); 183 184 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); 186 187 h->has_recovery_point = 1; 188 189 return 0; 190} 191 192static int decode_buffering_period(H264Context *h) 193{ 194 unsigned int sps_id; 195 int sched_sel_idx; 196 SPS *sps; 197 198 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; 203 } 204 sps = h->sps_buffers[sps_id]; 205 206 // 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); 213 } 214 } 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); 221 } 222 } 223 224 h->sei_buffering_period_present = 1; 225 return 0; 226} 227 228static int decode_frame_packing_arrangement(H264Context *h) 229{ 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; 233 234 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); 241 242 // 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); 246 247 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 */; 251 } 252 skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag 253 254 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); 262 263 return 0; 264} 265 266static int decode_display_orientation(H264Context *h) 267{ 268 h->sei_display_orientation_present = !get_bits1(&h->gb); 269 270 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 273 274 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 277 } 278 279 return 0; 280} 281 282int ff_h264_decode_sei(H264Context *h) 283{ 284 while (get_bits_left(&h->gb) > 16) { 285 int type = 0; 286 unsigned size = 0; 287 unsigned next; 288 int ret = 0; 289 290 do { 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); 295 296 do { 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); 301 302 if (h->avctx->debug&FF_DEBUG_STARTCODE) 303 av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size); 304 305 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; 309 } 310 next = get_bits_count(&h->gb) + 8 * size; 311 312 switch (type) { 313 case SEI_TYPE_PIC_TIMING: // Picture timing SEI 314 ret = decode_picture_timing(h); 315 if (ret < 0) 316 return ret; 317 break; 318 case SEI_TYPE_USER_DATA_ITU_T_T35: 319 if (decode_user_data_itu_t_t35(h, size) < 0) 320 return -1; 321 break; 322 case SEI_TYPE_USER_DATA_UNREGISTERED: 323 ret = decode_unregistered_user_data(h, size); 324 if (ret < 0) 325 return ret; 326 break; 327 case SEI_TYPE_RECOVERY_POINT: 328 ret = decode_recovery_point(h); 329 if (ret < 0) 330 return ret; 331 break; 332 case SEI_TYPE_BUFFERING_PERIOD: 333 ret = decode_buffering_period(h); 334 if (ret < 0) 335 return ret; 336 break; 337 case SEI_TYPE_FRAME_PACKING: 338 ret = decode_frame_packing_arrangement(h); 339 if (ret < 0) 340 return ret; 341 break; 342 case SEI_TYPE_DISPLAY_ORIENTATION: 343 ret = decode_display_orientation(h); 344 if (ret < 0) 345 return ret; 346 break; 347 default: 348 av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type); 349 } 350 skip_bits_long(&h->gb, next - get_bits_count(&h->gb)); 351 352 // FIXME check bits here 353 align_get_bits(&h->gb); 354 } 355 356 return 0; 357} 358 359const char* ff_h264_sei_stereo_mode(H264Context *h) 360{ 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"; 366 else 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"; 371 else 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"; 376 else 377 return "row_interleaved_lr"; 378 case SEI_FPA_TYPE_SIDE_BY_SIDE: 379 if (h->sei_fpa.content_interpretation_type == 2) 380 return "right_left"; 381 else 382 return "left_right"; 383 case SEI_FPA_TYPE_TOP_BOTTOM: 384 if (h->sei_fpa.content_interpretation_type == 2) 385 return "bottom_top"; 386 else 387 return "top_bottom"; 388 case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL: 389 if (h->sei_fpa.content_interpretation_type == 2) 390 return "block_rl"; 391 else 392 return "block_lr"; 393 case SEI_FPA_TYPE_2D: 394 default: 395 return "mono"; 396 } 397 } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) { 398 return "mono"; 399 } else { 400 return NULL; 401 } 402} 403