git.sesse.net Git - ffmpeg/blob - libavcodec/h264_sei.c

   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 && show_bits(&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 }