| 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 | |
| 33 | static const uint8_t sei_num_clock_ts_table[9] = { |
| 34 | 1, 1, 1, 2, 2, 3, 3, 2, 3 |
| 35 | }; |
| 36 | |
| 37 | void 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 | |
| 47 | static 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 | |
| 111 | static 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 | |
| 148 | static 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 | |
| 175 | static 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 | |
| 192 | static 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 | |
| 228 | static 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 | |
| 266 | static 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 | |
| 282 | int 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 | |
| 359 | const 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 | } |