git.sesse.net Git - ffmpeg/blob - libavcodec/h264_parser.c

   1 /*
   2  * H.26L/H.264/AVC/JVT/14496-10/... parser
   3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 parser.
  25  * @author Michael Niedermayer <michaelni@gmx.at>
  26  */
  27
  28 #include <assert.h>
  29 #include <stdint.h>
  30
  31 #include "libavutil/avutil.h"
  32 #include "libavutil/error.h"
  33 #include "libavutil/log.h"
  34 #include "libavutil/mem.h"
  35 #include "libavutil/pixfmt.h"
  36
  37 #include "get_bits.h"
  38 #include "golomb.h"
  39 #include "h264.h"
  40 #include "h264data.h"
  41 #include "internal.h"
  42 #include "mpegutils.h"
  43 #include "parser.h"
  44
  45 typedef struct H264ParseContext {
  46     H264Context h;
  47     ParseContext pc;
  48     int got_first;
  49 } H264ParseContext;
  50
  51
  52 static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
  53                                int buf_size)
  54 {
  55     H264Context *h = &p->h;
  56     int i;
  57     uint32_t state;
  58     ParseContext *pc = &p->pc;
  59 //    mb_addr= pc->mb_addr - 1;
  60     state = pc->state;
  61     if (state > 13)
  62         state = 7;
  63
  64     for (i = 0; i < buf_size; i++) {
  65         if (state == 7) {
  66             i += h->h264dsp.startcode_find_candidate(buf + i, buf_size - i);
  67             if (i < buf_size)
  68                 state = 2;
  69         } else if (state <= 2) {
  70             if (buf[i] == 1)
  71                 state ^= 5;            // 2->7, 1->4, 0->5
  72             else if (buf[i])
  73                 state = 7;
  74             else
  75                 state >>= 1;           // 2->1, 1->0, 0->0
  76         } else if (state <= 5) {
  77             int nalu_type = buf[i] & 0x1F;
  78             if (nalu_type == NAL_SEI || nalu_type == NAL_SPS ||
  79                 nalu_type == NAL_PPS || nalu_type == NAL_AUD) {
  80                 if (pc->frame_start_found) {
  81                     i++;
  82                     goto found;
  83                 }
  84             } else if (nalu_type == NAL_SLICE || nalu_type == NAL_DPA ||
  85                        nalu_type == NAL_IDR_SLICE) {
  86                 if (pc->frame_start_found) {
  87                     state += 8;
  88                     continue;
  89                 } else
  90                     pc->frame_start_found = 1;
  91             }
  92             state = 7;
  93         } else {
  94             // first_mb_in_slice is 0, probably the first nal of a new slice
  95             if (buf[i] & 0x80)
  96                 goto found;
  97             state = 7;
  98         }
  99     }
 100     pc->state = state;
 101     return END_NOT_FOUND;
 102
 103 found:
 104     pc->state             = 7;
 105     pc->frame_start_found = 0;
 106     return i - (state & 5);
 107 }
 108
 109 static int scan_mmco_reset(AVCodecParserContext *s)
 110 {
 111     H264ParseContext *p = s->priv_data;
 112     H264Context      *h = &p->h;
 113     H264SliceContext *sl = &h->slice_ctx[0];
 114     int list_count, ref_count[2];
 115
 116     sl->slice_type_nos = s->pict_type & 3;
 117
 118     if (h->pps.redundant_pic_cnt_present)
 119         get_ue_golomb(&sl->gb); // redundant_pic_count
 120
 121     if (sl->slice_type_nos == AV_PICTURE_TYPE_B)
 122         get_bits1(&sl->gb); // direct_spatial_mv_pred
 123
 124     if (ff_h264_parse_ref_count(&list_count, ref_count, &sl->gb, &h->pps,
 125                                 sl->slice_type_nos, h->picture_structure) < 0)
 126         return AVERROR_INVALIDDATA;
 127
 128     if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {
 129         int list;
 130         for (list = 0; list < list_count; list++) {
 131             if (get_bits1(&sl->gb)) {
 132                 int index;
 133                 for (index = 0; ; index++) {
 134                     unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(&sl->gb);
 135
 136                     if (reordering_of_pic_nums_idc < 3)
 137                         get_ue_golomb(&sl->gb);
 138                     else if (reordering_of_pic_nums_idc > 3) {
 139                         av_log(h->avctx, AV_LOG_ERROR,
 140                                "illegal reordering_of_pic_nums_idc %d\n",
 141                                reordering_of_pic_nums_idc);
 142                         return AVERROR_INVALIDDATA;
 143                     } else
 144                         break;
 145
 146                     if (index >= ref_count[list]) {
 147                         av_log(h->avctx, AV_LOG_ERROR,
 148                                "reference count %d overflow\n", index);
 149                         return AVERROR_INVALIDDATA;
 150                     }
 151                 }
 152             }
 153         }
 154     }
 155
 156     if ((h->pps.weighted_pred && sl->slice_type_nos == AV_PICTURE_TYPE_P) ||
 157         (h->pps.weighted_bipred_idc == 1 && sl->slice_type_nos == AV_PICTURE_TYPE_B))
 158         ff_h264_pred_weight_table(&sl->gb, &h->sps, ref_count, sl->slice_type_nos,
 159                                   &sl->pwt);
 160
 161     if (get_bits1(&sl->gb)) { // adaptive_ref_pic_marking_mode_flag
 162         int i;
 163         for (i = 0; i < MAX_MMCO_COUNT; i++) {
 164             MMCOOpcode opcode = get_ue_golomb_31(&sl->gb);
 165             if (opcode > (unsigned) MMCO_LONG) {
 166                 av_log(h->avctx, AV_LOG_ERROR,
 167                        "illegal memory management control operation %d\n",
 168                        opcode);
 169                 return AVERROR_INVALIDDATA;
 170             }
 171             if (opcode == MMCO_END)
 172                return 0;
 173             else if (opcode == MMCO_RESET)
 174                 return 1;
 175
 176             if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
 177                 get_ue_golomb(&sl->gb);
 178             if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
 179                 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
 180                 get_ue_golomb_31(&sl->gb);
 181         }
 182     }
 183
 184     return 0;
 185 }
 186
 187 /**
 188  * Parse NAL units of found picture and decode some basic information.
 189  *
 190  * @param s parser context.
 191  * @param avctx codec context.
 192  * @param buf buffer with field/frame data.
 193  * @param buf_size size of the buffer.
 194  */
 195 static inline int parse_nal_units(AVCodecParserContext *s,
 196                                   AVCodecContext *avctx,
 197                                   const uint8_t *buf, int buf_size)
 198 {
 199     H264ParseContext *p = s->priv_data;
 200     H264Context      *h = &p->h;
 201     H264SliceContext *sl = &h->slice_ctx[0];
 202     const uint8_t *buf_end = buf + buf_size;
 203
 204     H2645NAL nal = { NULL };
 205
 206     unsigned int pps_id;
 207     unsigned int slice_type;
 208     int state = -1, got_reset = 0;
 209     int field_poc[2];
 210     int ret;
 211
 212     /* set some sane default values */
 213     s->pict_type         = AV_PICTURE_TYPE_I;
 214     s->key_frame         = 0;
 215     s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
 216
 217     h->avctx = avctx;
 218     ff_h264_reset_sei(h);
 219
 220     if (!buf_size)
 221         return 0;
 222
 223     for (;;) {
 224         int src_length, consumed;
 225         buf = avpriv_find_start_code(buf, buf_end, &state);
 226         if (buf >= buf_end)
 227             break;
 228         --buf;
 229         src_length = buf_end - buf;
 230         switch (state & 0x1f) {
 231         case NAL_SLICE:
 232         case NAL_IDR_SLICE:
 233             // Do not walk the whole buffer just to decode slice header
 234             if ((state & 0x1f) == NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
 235                 /* IDR or disposable slice
 236                  * No need to decode many bytes because MMCOs shall not be present. */
 237                 if (src_length > 60)
 238                     src_length = 60;
 239             } else {
 240                 /* To decode up to MMCOs */
 241                 if (src_length > 1000)
 242                     src_length = 1000;
 243             }
 244             break;
 245         }
 246
 247         consumed = ff_h2645_extract_rbsp(buf, src_length, &nal);
 248         if (consumed < 0)
 249             break;
 250
 251         ret = init_get_bits(&nal.gb, nal.data, nal.size * 8);
 252         if (ret < 0)
 253             goto fail;
 254         get_bits1(&nal.gb);
 255         nal.ref_idc = get_bits(&nal.gb, 2);
 256         nal.type    = get_bits(&nal.gb, 5);
 257
 258         h->gb            = nal.gb;
 259         h->nal_ref_idc   = nal.ref_idc;
 260         h->nal_unit_type = nal.type;
 261
 262         switch (h->nal_unit_type) {
 263         case NAL_SPS:
 264             ff_h264_decode_seq_parameter_set(h);
 265             break;
 266         case NAL_PPS:
 267             ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);
 268             break;
 269         case NAL_SEI:
 270             ff_h264_decode_sei(h);
 271             break;
 272         case NAL_IDR_SLICE:
 273             s->key_frame = 1;
 274
 275             h->prev_frame_num        = 0;
 276             h->prev_frame_num_offset = 0;
 277             h->prev_poc_msb          =
 278             h->prev_poc_lsb          = 0;
 279         /* fall through */
 280         case NAL_SLICE:
 281             sl->gb = nal.gb;
 282             get_ue_golomb(&sl->gb);  // skip first_mb_in_slice
 283             slice_type   = get_ue_golomb_31(&sl->gb);
 284             s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
 285             if (h->sei_recovery_frame_cnt >= 0) {
 286                 /* key frame, since recovery_frame_cnt is set */
 287                 s->key_frame = 1;
 288             }
 289             pps_id = get_ue_golomb(&sl->gb);
 290             if (pps_id >= MAX_PPS_COUNT) {
 291                 av_log(h->avctx, AV_LOG_ERROR,
 292                        "pps_id %u out of range\n", pps_id);
 293                 goto fail;
 294             }
 295             if (!h->pps_buffers[pps_id]) {
 296                 av_log(h->avctx, AV_LOG_ERROR,
 297                        "non-existing PPS %u referenced\n", pps_id);
 298                 goto fail;
 299             }
 300             h->pps = *h->pps_buffers[pps_id];
 301             if (!h->sps_buffers[h->pps.sps_id]) {
 302                 av_log(h->avctx, AV_LOG_ERROR,
 303                        "non-existing SPS %u referenced\n", h->pps.sps_id);
 304                 goto fail;
 305             }
 306             h->sps       = *h->sps_buffers[h->pps.sps_id];
 307             h->frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
 308
 309             s->coded_width  = 16 * h->sps.mb_width;
 310             s->coded_height = 16 * h->sps.mb_height;
 311             s->width        = s->coded_width  - (h->sps.crop_right + h->sps.crop_left);
 312             s->height       = s->coded_height - (h->sps.crop_top   + h->sps.crop_bottom);
 313             if (s->width <= 0 || s->height <= 0) {
 314                 s->width  = s->coded_width;
 315                 s->height = s->coded_height;
 316             }
 317
 318             switch (h->sps.bit_depth_luma) {
 319             case 9:
 320                 if (CHROMA444(h))      s->format = AV_PIX_FMT_YUV444P9;
 321                 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P9;
 322                 else                   s->format = AV_PIX_FMT_YUV420P9;
 323                 break;
 324             case 10:
 325                 if (CHROMA444(h))      s->format = AV_PIX_FMT_YUV444P10;
 326                 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P10;
 327                 else                   s->format = AV_PIX_FMT_YUV420P10;
 328                 break;
 329             case 8:
 330                 if (CHROMA444(h))      s->format = AV_PIX_FMT_YUV444P;
 331                 else if (CHROMA422(h)) s->format = AV_PIX_FMT_YUV422P;
 332                 else                   s->format = AV_PIX_FMT_YUV420P;
 333                 break;
 334             default:
 335                 s->format = AV_PIX_FMT_NONE;
 336             }
 337
 338             avctx->profile = ff_h264_get_profile(&h->sps);
 339             avctx->level   = h->sps.level_idc;
 340
 341             if (h->sps.frame_mbs_only_flag) {
 342                 h->picture_structure = PICT_FRAME;
 343             } else {
 344                 if (get_bits1(&sl->gb)) { // field_pic_flag
 345                     h->picture_structure = PICT_TOP_FIELD + get_bits1(&sl->gb); // bottom_field_flag
 346                 } else {
 347                     h->picture_structure = PICT_FRAME;
 348                 }
 349             }
 350
 351             if (h->nal_unit_type == NAL_IDR_SLICE)
 352                 get_ue_golomb(&sl->gb); /* idr_pic_id */
 353             if (h->sps.poc_type == 0) {
 354                 h->poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
 355
 356                 if (h->pps.pic_order_present == 1 &&
 357                     h->picture_structure == PICT_FRAME)
 358                     h->delta_poc_bottom = get_se_golomb(&sl->gb);
 359             }
 360
 361             if (h->sps.poc_type == 1 &&
 362                 !h->sps.delta_pic_order_always_zero_flag) {
 363                 h->delta_poc[0] = get_se_golomb(&sl->gb);
 364
 365                 if (h->pps.pic_order_present == 1 &&
 366                     h->picture_structure == PICT_FRAME)
 367                     h->delta_poc[1] = get_se_golomb(&sl->gb);
 368             }
 369
 370             /* Decode POC of this picture.
 371              * The prev_ values needed for decoding POC of the next picture are not set here. */
 372             field_poc[0] = field_poc[1] = INT_MAX;
 373             ff_init_poc(h, field_poc, &s->output_picture_number);
 374
 375             /* Continue parsing to check if MMCO_RESET is present.
 376              * FIXME: MMCO_RESET could appear in non-first slice.
 377              *        Maybe, we should parse all undisposable non-IDR slice of this
 378              *        picture until encountering MMCO_RESET in a slice of it. */
 379             if (h->nal_ref_idc && h->nal_unit_type != NAL_IDR_SLICE) {
 380                 got_reset = scan_mmco_reset(s);
 381                 if (got_reset < 0)
 382                     goto fail;
 383             }
 384
 385             /* Set up the prev_ values for decoding POC of the next picture. */
 386             h->prev_frame_num        = got_reset ? 0 : h->frame_num;
 387             h->prev_frame_num_offset = got_reset ? 0 : h->frame_num_offset;
 388             if (h->nal_ref_idc != 0) {
 389                 if (!got_reset) {
 390                     h->prev_poc_msb = h->poc_msb;
 391                     h->prev_poc_lsb = h->poc_lsb;
 392                 } else {
 393                     h->prev_poc_msb = 0;
 394                     h->prev_poc_lsb =
 395                         h->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
 396                 }
 397             }
 398
 399             if (h->sps.pic_struct_present_flag) {
 400                 switch (h->sei_pic_struct) {
 401                 case SEI_PIC_STRUCT_TOP_FIELD:
 402                 case SEI_PIC_STRUCT_BOTTOM_FIELD:
 403                     s->repeat_pict = 0;
 404                     break;
 405                 case SEI_PIC_STRUCT_FRAME:
 406                 case SEI_PIC_STRUCT_TOP_BOTTOM:
 407                 case SEI_PIC_STRUCT_BOTTOM_TOP:
 408                     s->repeat_pict = 1;
 409                     break;
 410                 case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
 411                 case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
 412                     s->repeat_pict = 2;
 413                     break;
 414                 case SEI_PIC_STRUCT_FRAME_DOUBLING:
 415                     s->repeat_pict = 3;
 416                     break;
 417                 case SEI_PIC_STRUCT_FRAME_TRIPLING:
 418                     s->repeat_pict = 5;
 419                     break;
 420                 default:
 421                     s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
 422                     break;
 423                 }
 424             } else {
 425                 s->repeat_pict = h->picture_structure == PICT_FRAME ? 1 : 0;
 426             }
 427
 428             if (h->picture_structure == PICT_FRAME) {
 429                 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
 430                 if (h->sps.pic_struct_present_flag) {
 431                     switch (h->sei_pic_struct) {
 432                     case SEI_PIC_STRUCT_TOP_BOTTOM:
 433                     case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
 434                         s->field_order = AV_FIELD_TT;
 435                         break;
 436                     case SEI_PIC_STRUCT_BOTTOM_TOP:
 437                     case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
 438                         s->field_order = AV_FIELD_BB;
 439                         break;
 440                     default:
 441                         s->field_order = AV_FIELD_PROGRESSIVE;
 442                         break;
 443                     }
 444                 } else {
 445                     if (field_poc[0] < field_poc[1])
 446                         s->field_order = AV_FIELD_TT;
 447                     else if (field_poc[0] > field_poc[1])
 448                         s->field_order = AV_FIELD_BB;
 449                     else
 450                         s->field_order = AV_FIELD_PROGRESSIVE;
 451                 }
 452             } else {
 453                 if (h->picture_structure == PICT_TOP_FIELD)
 454                     s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
 455                 else
 456                     s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
 457                 s->field_order = AV_FIELD_UNKNOWN;
 458             }
 459
 460             av_freep(&nal.rbsp_buffer);
 461             return 0; /* no need to evaluate the rest */
 462         }
 463         buf += consumed;
 464     }
 465     /* didn't find a picture! */
 466     av_log(h->avctx, AV_LOG_ERROR, "missing picture in access unit\n");
 467 fail:
 468     av_freep(&nal.rbsp_buffer);
 469     return -1;
 470 }
 471
 472 static int h264_parse(AVCodecParserContext *s,
 473                       AVCodecContext *avctx,
 474                       const uint8_t **poutbuf, int *poutbuf_size,
 475                       const uint8_t *buf, int buf_size)
 476 {
 477     H264ParseContext *p = s->priv_data;
 478     H264Context      *h = &p->h;
 479     ParseContext *pc = &p->pc;
 480     int next;
 481
 482     if (!p->got_first) {
 483         p->got_first = 1;
 484         if (avctx->extradata_size) {
 485             h->avctx = avctx;
 486             // must be done like in the decoder.
 487             // otherwise opening the parser, creating extradata,
 488             // and then closing and opening again
 489             // will cause has_b_frames to be always set.
 490             // NB: estimate_timings_from_pts behaves exactly like this.
 491             if (!avctx->has_b_frames)
 492                 h->low_delay = 1;
 493             ff_h264_decode_extradata(h);
 494         }
 495     }
 496
 497     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
 498         next = buf_size;
 499     } else {
 500         next = h264_find_frame_end(p, buf, buf_size);
 501
 502         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
 503             *poutbuf      = NULL;
 504             *poutbuf_size = 0;
 505             return buf_size;
 506         }
 507
 508         if (next < 0 && next != END_NOT_FOUND) {
 509             assert(pc->last_index + next >= 0);
 510             h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next); // update state
 511         }
 512     }
 513
 514     parse_nal_units(s, avctx, buf, buf_size);
 515
 516     if (h->sei_cpb_removal_delay >= 0) {
 517         s->dts_sync_point    = h->sei_buffering_period_present;
 518         s->dts_ref_dts_delta = h->sei_cpb_removal_delay;
 519         s->pts_dts_delta     = h->sei_dpb_output_delay;
 520     } else {
 521         s->dts_sync_point    = INT_MIN;
 522         s->dts_ref_dts_delta = INT_MIN;
 523         s->pts_dts_delta     = INT_MIN;
 524     }
 525
 526     if (s->flags & PARSER_FLAG_ONCE) {
 527         s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
 528     }
 529
 530     *poutbuf      = buf;
 531     *poutbuf_size = buf_size;
 532     return next;
 533 }
 534
 535 static int h264_split(AVCodecContext *avctx,
 536                       const uint8_t *buf, int buf_size)
 537 {
 538     int i;
 539     uint32_t state = -1;
 540     int has_sps    = 0;
 541
 542     for (i = 0; i <= buf_size; i++) {
 543         if ((state & 0xFFFFFF1F) == 0x107)
 544             has_sps = 1;
 545         /*  if((state&0xFFFFFF1F) == 0x101 ||
 546          *     (state&0xFFFFFF1F) == 0x102 ||
 547          *     (state&0xFFFFFF1F) == 0x105) {
 548          *  }
 549          */
 550         if ((state & 0xFFFFFF00) == 0x100 && (state & 0xFFFFFF1F) != 0x106 &&
 551             (state & 0xFFFFFF1F) != 0x107 && (state & 0xFFFFFF1F) != 0x108 &&
 552             (state & 0xFFFFFF1F) != 0x109 && (state & 0xFFFFFF1F) != 0x10d &&
 553             (state & 0xFFFFFF1F) != 0x10f) {
 554             if (has_sps) {
 555                 while (i > 4 && buf[i - 5] == 0)
 556                     i--;
 557                 return i - 4;
 558             }
 559         }
 560         if (i < buf_size)
 561             state = (state << 8) | buf[i];
 562     }
 563     return 0;
 564 }
 565
 566 static void h264_close(AVCodecParserContext *s)
 567 {
 568     H264ParseContext *p = s->priv_data;
 569     H264Context      *h = &p->h;
 570     ParseContext *pc = &p->pc;
 571
 572     av_free(pc->buffer);
 573     ff_h264_free_context(h);
 574 }
 575
 576 static av_cold int init(AVCodecParserContext *s)
 577 {
 578     H264ParseContext *p = s->priv_data;
 579     H264Context      *h = &p->h;
 580
 581     h->slice_ctx = av_mallocz(sizeof(*h->slice_ctx));
 582     if (!h->slice_ctx)
 583         return 0;
 584     h->nb_slice_ctx = 1;
 585
 586     h->slice_context_count = 1;
 587     ff_h264dsp_init(&h->h264dsp, 8, 1);
 588     return 0;
 589 }
 590
 591 AVCodecParser ff_h264_parser = {
 592     .codec_ids      = { AV_CODEC_ID_H264 },
 593     .priv_data_size = sizeof(H264ParseContext),
 594     .parser_init    = init,
 595     .parser_parse   = h264_parse,
 596     .parser_close   = h264_close,
 597     .split          = h264_split,
 598 };