LCOV - code coverage report
Current view: top level - libavcodec - h264_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 340 403 84.4 %
Date: 2017-12-16 13:57:32 Functions: 6 7 85.7 %

          Line data    Source code
       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 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 / MPEG-4 part10 parser.
      25             :  * @author Michael Niedermayer <michaelni@gmx.at>
      26             :  */
      27             : 
      28             : #define UNCHECKED_BITSTREAM_READER 1
      29             : 
      30             : #include <assert.h>
      31             : #include <stdint.h>
      32             : 
      33             : #include "libavutil/avutil.h"
      34             : #include "libavutil/error.h"
      35             : #include "libavutil/log.h"
      36             : #include "libavutil/mem.h"
      37             : #include "libavutil/pixfmt.h"
      38             : 
      39             : #include "avcodec.h"
      40             : #include "get_bits.h"
      41             : #include "golomb.h"
      42             : #include "h264.h"
      43             : #include "h264_sei.h"
      44             : #include "h264_ps.h"
      45             : #include "h264data.h"
      46             : #include "internal.h"
      47             : #include "mpegutils.h"
      48             : #include "parser.h"
      49             : 
      50             : typedef struct H264ParseContext {
      51             :     ParseContext pc;
      52             :     H264ParamSets ps;
      53             :     H264DSPContext h264dsp;
      54             :     H264POCContext poc;
      55             :     H264SEIContext sei;
      56             :     int is_avc;
      57             :     int nal_length_size;
      58             :     int got_first;
      59             :     int picture_structure;
      60             :     uint8_t parse_history[6];
      61             :     int parse_history_count;
      62             :     int parse_last_mb;
      63             :     int64_t reference_dts;
      64             :     int last_frame_num, last_picture_structure;
      65             : } H264ParseContext;
      66             : 
      67             : 
      68      177239 : static int h264_find_frame_end(H264ParseContext *p, const uint8_t *buf,
      69             :                                int buf_size, void *logctx)
      70             : {
      71             :     int i, j;
      72             :     uint32_t state;
      73      177239 :     ParseContext *pc = &p->pc;
      74             : 
      75      177239 :     int next_avc = p->is_avc ? 0 : buf_size;
      76             : //    mb_addr= pc->mb_addr - 1;
      77      177239 :     state = pc->state;
      78      177239 :     if (state > 13)
      79         165 :         state = 7;
      80             : 
      81      177239 :     if (p->is_avc && !p->nal_length_size)
      82           0 :         av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal length size invalid\n");
      83             : 
      84     2801145 :     for (i = 0; i < buf_size; i++) {
      85     2647276 :         if (i >= next_avc) {
      86           0 :             int nalsize = 0;
      87           0 :             i = next_avc;
      88           0 :             for (j = 0; j < p->nal_length_size; j++)
      89           0 :                 nalsize = (nalsize << 8) | buf[i++];
      90           0 :             if (nalsize <= 0 || nalsize > buf_size - i) {
      91           0 :                 av_log(logctx, AV_LOG_ERROR, "AVC-parser: nal size %d remaining %d\n", nalsize, buf_size - i);
      92           0 :                 return buf_size;
      93             :             }
      94           0 :             next_avc = i + nalsize;
      95           0 :             state    = 5;
      96             :         }
      97             : 
      98     2647276 :         if (state == 7) {
      99     1149985 :             i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
     100     1149985 :             if (i < next_avc)
     101      998973 :                 state = 2;
     102     1497291 :         } else if (state <= 2) {
     103     1150842 :             if (buf[i] == 1)
     104       89962 :                 state ^= 5;            // 2->7, 1->4, 0->5
     105     1060880 :             else if (buf[i])
     106      909247 :                 state = 7;
     107             :             else
     108      151633 :                 state >>= 1;           // 2->1, 1->0, 0->0
     109      346449 :         } else if (state <= 5) {
     110       65427 :             int nalu_type = buf[i] & 0x1F;
     111       65427 :             if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
     112       51165 :                 nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
     113       28919 :                 if (pc->frame_start_found) {
     114        7507 :                     i++;
     115        7507 :                     goto found;
     116             :                 }
     117       47214 :             } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
     118             :                        nalu_type == H264_NAL_IDR_SLICE) {
     119       46837 :                 state += 8;
     120       46837 :                 continue;
     121             :             }
     122       11083 :             state = 7;
     123             :         } else {
     124      281022 :             p->parse_history[p->parse_history_count++] = buf[i];
     125      281022 :             if (p->parse_history_count > 5) {
     126       46837 :                 unsigned int mb, last_mb = p->parse_last_mb;
     127             :                 GetBitContext gb;
     128             : 
     129       46837 :                 init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
     130       46837 :                 p->parse_history_count = 0;
     131       46837 :                 mb= get_ue_golomb_long(&gb);
     132       46837 :                 p->parse_last_mb = mb;
     133       46837 :                 if (pc->frame_start_found) {
     134       23249 :                     if (mb <= last_mb)
     135       15863 :                         goto found;
     136             :                 } else
     137       23588 :                     pc->frame_start_found = 1;
     138       30974 :                 state = 7;
     139             :             }
     140             :         }
     141             :     }
     142      153869 :     pc->state = state;
     143      153869 :     if (p->is_avc)
     144           0 :         return next_avc;
     145      153869 :     return END_NOT_FOUND;
     146             : 
     147       23370 : found:
     148       23370 :     pc->state             = 7;
     149       23370 :     pc->frame_start_found = 0;
     150       23370 :     if (p->is_avc)
     151           0 :         return next_avc;
     152       23370 :     return i - (state & 5) - 5 * (state > 7);
     153             : }
     154             : 
     155       15687 : static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
     156             :                            void *logctx)
     157             : {
     158             :     H264PredWeightTable pwt;
     159       15687 :     int slice_type_nos = s->pict_type & 3;
     160       15687 :     H264ParseContext *p = s->priv_data;
     161             :     int list_count, ref_count[2];
     162             : 
     163             : 
     164       15687 :     if (p->ps.pps->redundant_pic_cnt_present)
     165          50 :         get_ue_golomb(gb); // redundant_pic_count
     166             : 
     167       15687 :     if (slice_type_nos == AV_PICTURE_TYPE_B)
     168         383 :         get_bits1(gb); // direct_spatial_mv_pred
     169             : 
     170       15687 :     if (ff_h264_parse_ref_count(&list_count, ref_count, gb, p->ps.pps,
     171             :                                 slice_type_nos, p->picture_structure, logctx) < 0)
     172           5 :         return AVERROR_INVALIDDATA;
     173             : 
     174       15682 :     if (slice_type_nos != AV_PICTURE_TYPE_I) {
     175             :         int list;
     176       28409 :         for (list = 0; list < list_count; list++) {
     177       14422 :             if (get_bits1(gb)) {
     178             :                 int index;
     179       10781 :                 for (index = 0; ; index++) {
     180       10781 :                     unsigned int reordering_of_pic_nums_idc = get_ue_golomb_31(gb);
     181             : 
     182       10781 :                     if (reordering_of_pic_nums_idc < 3)
     183        8605 :                         get_ue_golomb_long(gb);
     184        2176 :                     else if (reordering_of_pic_nums_idc > 3) {
     185           9 :                         av_log(logctx, AV_LOG_ERROR,
     186             :                                "illegal reordering_of_pic_nums_idc %d\n",
     187             :                                reordering_of_pic_nums_idc);
     188           9 :                         return AVERROR_INVALIDDATA;
     189             :                     } else
     190        2167 :                         break;
     191             : 
     192        8605 :                     if (index >= ref_count[list]) {
     193          43 :                         av_log(logctx, AV_LOG_ERROR,
     194             :                                "reference count %d overflow\n", index);
     195          43 :                         return AVERROR_INVALIDDATA;
     196             :                     }
     197             :                 }
     198             :             }
     199             :         }
     200             :     }
     201             : 
     202       30304 :     if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
     203       14883 :         (p->ps.pps->weighted_bipred_idc == 1 && slice_type_nos == AV_PICTURE_TYPE_B))
     204         974 :         ff_h264_pred_weight_table(gb, p->ps.sps, ref_count, slice_type_nos,
     205             :                                   &pwt, p->picture_structure, logctx);
     206             : 
     207       15630 :     if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag
     208             :         int i;
     209        4090 :         for (i = 0; i < MAX_MMCO_COUNT; i++) {
     210        4090 :             MMCOOpcode opcode = get_ue_golomb_31(gb);
     211        4090 :             if (opcode > (unsigned) MMCO_LONG) {
     212           6 :                 av_log(logctx, AV_LOG_ERROR,
     213             :                        "illegal memory management control operation %d\n",
     214             :                        opcode);
     215           6 :                 return AVERROR_INVALIDDATA;
     216             :             }
     217        4084 :             if (opcode == MMCO_END)
     218        1389 :                return 0;
     219        2695 :             else if (opcode == MMCO_RESET)
     220          50 :                 return 1;
     221             : 
     222        2645 :             if (opcode == MMCO_SHORT2UNUSED || opcode == MMCO_SHORT2LONG)
     223        2160 :                 get_ue_golomb_long(gb); // difference_of_pic_nums_minus1
     224        2645 :             if (opcode == MMCO_SHORT2LONG || opcode == MMCO_LONG2UNUSED ||
     225        2206 :                 opcode == MMCO_LONG || opcode == MMCO_SET_MAX_LONG)
     226         818 :                 get_ue_golomb_31(gb);
     227             :         }
     228             :     }
     229             : 
     230       14185 :     return 0;
     231             : }
     232             : 
     233             : /**
     234             :  * Parse NAL units of found picture and decode some basic information.
     235             :  *
     236             :  * @param s parser context.
     237             :  * @param avctx codec context.
     238             :  * @param buf buffer with field/frame data.
     239             :  * @param buf_size size of the buffer.
     240             :  */
     241       25584 : static inline int parse_nal_units(AVCodecParserContext *s,
     242             :                                   AVCodecContext *avctx,
     243             :                                   const uint8_t * const buf, int buf_size)
     244             : {
     245       25584 :     H264ParseContext *p = s->priv_data;
     246       25584 :     H2645RBSP rbsp = { NULL };
     247       25584 :     H2645NAL nal = { NULL };
     248             :     int buf_index, next_avc;
     249             :     unsigned int pps_id;
     250             :     unsigned int slice_type;
     251       25584 :     int state = -1, got_reset = 0;
     252       25584 :     int q264 = buf_size >=4 && !memcmp("Q264", buf, 4);
     253             :     int field_poc[2];
     254             :     int ret;
     255             : 
     256             :     /* set some sane default values */
     257       25584 :     s->pict_type         = AV_PICTURE_TYPE_I;
     258       25584 :     s->key_frame         = 0;
     259       25584 :     s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
     260             : 
     261       25584 :     ff_h264_sei_uninit(&p->sei);
     262       25584 :     p->sei.frame_packing.arrangement_cancel_flag = -1;
     263             : 
     264       25584 :     if (!buf_size)
     265         234 :         return 0;
     266             : 
     267       25350 :     av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
     268       25350 :     if (!rbsp.rbsp_buffer)
     269           0 :         return AVERROR(ENOMEM);
     270             : 
     271       25350 :     buf_index     = 0;
     272       25350 :     next_avc      = p->is_avc ? 0 : buf_size;
     273       11541 :     for (;;) {
     274             :         const SPS *sps;
     275       36891 :         int src_length, consumed, nalsize = 0;
     276             : 
     277       36891 :         if (buf_index >= next_avc) {
     278        2321 :             nalsize = get_nalsize(p->nal_length_size, buf, buf_size, &buf_index, avctx);
     279        2321 :             if (nalsize < 0)
     280           1 :                 break;
     281        2320 :             next_avc = buf_index + nalsize;
     282             :         } else {
     283       34570 :             buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
     284       34570 :             if (buf_index >= buf_size)
     285           0 :                 break;
     286       34570 :             if (buf_index >= next_avc)
     287           0 :                 continue;
     288             :         }
     289       36890 :         src_length = next_avc - buf_index;
     290             : 
     291       36890 :         state = buf[buf_index];
     292       36890 :         switch (state & 0x1f) {
     293       25349 :         case H264_NAL_SLICE:
     294             :         case H264_NAL_IDR_SLICE:
     295             :             // Do not walk the whole buffer just to decode slice header
     296       25349 :             if ((state & 0x1f) == H264_NAL_IDR_SLICE || ((state >> 5) & 0x3) == 0) {
     297             :                 /* IDR or disposable slice
     298             :                  * No need to decode many bytes because MMCOs shall not be present. */
     299       18904 :                 if (src_length > 60)
     300        9306 :                     src_length = 60;
     301             :             } else {
     302             :                 /* To decode up to MMCOs */
     303       15897 :                 if (src_length > 1000)
     304        8850 :                     src_length = 1000;
     305             :             }
     306       25349 :             break;
     307             :         }
     308       36890 :         consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
     309       36890 :         if (consumed < 0)
     310           0 :             break;
     311             : 
     312       36890 :         buf_index += consumed;
     313             : 
     314       36890 :         ret = init_get_bits8(&nal.gb, nal.data, nal.size);
     315       36890 :         if (ret < 0)
     316           0 :             goto fail;
     317       36890 :         get_bits1(&nal.gb);
     318       36890 :         nal.ref_idc = get_bits(&nal.gb, 2);
     319       36890 :         nal.type    = get_bits(&nal.gb, 5);
     320             : 
     321       36890 :         switch (nal.type) {
     322         774 :         case H264_NAL_SPS:
     323         774 :             ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
     324         774 :             break;
     325        6917 :         case H264_NAL_PPS:
     326        6917 :             ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
     327             :                                                  nal.size_bits);
     328        6917 :             break;
     329        1458 :         case H264_NAL_SEI:
     330        1458 :             ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
     331        1458 :             break;
     332         570 :         case H264_NAL_IDR_SLICE:
     333         570 :             s->key_frame = 1;
     334             : 
     335         570 :             p->poc.prev_frame_num        = 0;
     336         570 :             p->poc.prev_frame_num_offset = 0;
     337         570 :             p->poc.prev_poc_msb          =
     338         570 :             p->poc.prev_poc_lsb          = 0;
     339             :         /* fall through */
     340       25349 :         case H264_NAL_SLICE:
     341       25349 :             get_ue_golomb_long(&nal.gb);  // skip first_mb_in_slice
     342       25349 :             slice_type   = get_ue_golomb_31(&nal.gb);
     343       25349 :             s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
     344       25349 :             if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
     345             :                 /* key frame, since recovery_frame_cnt is set */
     346          25 :                 s->key_frame = 1;
     347             :             }
     348       25349 :             pps_id = get_ue_golomb(&nal.gb);
     349       25349 :             if (pps_id >= MAX_PPS_COUNT) {
     350           0 :                 av_log(avctx, AV_LOG_ERROR,
     351             :                        "pps_id %u out of range\n", pps_id);
     352           0 :                 goto fail;
     353             :             }
     354       25349 :             if (!p->ps.pps_list[pps_id]) {
     355         226 :                 av_log(avctx, AV_LOG_ERROR,
     356             :                        "non-existing PPS %u referenced\n", pps_id);
     357         226 :                 goto fail;
     358             :             }
     359             : 
     360       25123 :             av_buffer_unref(&p->ps.pps_ref);
     361       25123 :             av_buffer_unref(&p->ps.sps_ref);
     362       25123 :             p->ps.pps = NULL;
     363       25123 :             p->ps.sps = NULL;
     364       25123 :             p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
     365       25123 :             if (!p->ps.pps_ref)
     366           0 :                 goto fail;
     367       25123 :             p->ps.pps = (const PPS*)p->ps.pps_ref->data;
     368             : 
     369       25123 :             if (!p->ps.sps_list[p->ps.pps->sps_id]) {
     370           0 :                 av_log(avctx, AV_LOG_ERROR,
     371           0 :                        "non-existing SPS %u referenced\n", p->ps.pps->sps_id);
     372           0 :                 goto fail;
     373             :             }
     374             : 
     375       25123 :             p->ps.sps_ref = av_buffer_ref(p->ps.sps_list[p->ps.pps->sps_id]);
     376       25123 :             if (!p->ps.sps_ref)
     377           0 :                 goto fail;
     378       25123 :             p->ps.sps = (const SPS*)p->ps.sps_ref->data;
     379             : 
     380       25123 :             sps = p->ps.sps;
     381             : 
     382             :             // heuristic to detect non marked keyframes
     383       25123 :             if (p->ps.sps->ref_frame_count <= 1 && p->ps.pps->ref_count[0] <= 1 && s->pict_type == AV_PICTURE_TYPE_I)
     384         951 :                 s->key_frame = 1;
     385             : 
     386       25123 :             p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
     387             : 
     388       25123 :             s->coded_width  = 16 * sps->mb_width;
     389       25123 :             s->coded_height = 16 * sps->mb_height;
     390       25123 :             s->width        = s->coded_width  - (sps->crop_right + sps->crop_left);
     391       25123 :             s->height       = s->coded_height - (sps->crop_top   + sps->crop_bottom);
     392       25123 :             if (s->width <= 0 || s->height <= 0) {
     393           0 :                 s->width  = s->coded_width;
     394           0 :                 s->height = s->coded_height;
     395             :             }
     396             : 
     397       25123 :             switch (sps->bit_depth_luma) {
     398         150 :             case 9:
     399         150 :                 if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P9;
     400         150 :                 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P9;
     401         100 :                 else                                  s->format = AV_PIX_FMT_YUV420P9;
     402         150 :                 break;
     403         207 :             case 10:
     404         207 :                 if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P10;
     405         157 :                 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P10;
     406          70 :                 else                                  s->format = AV_PIX_FMT_YUV420P10;
     407         207 :                 break;
     408       24766 :             case 8:
     409       24766 :                 if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P;
     410       24407 :                 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
     411       24397 :                 else                                  s->format = AV_PIX_FMT_YUV420P;
     412       24766 :                 break;
     413           0 :             default:
     414           0 :                 s->format = AV_PIX_FMT_NONE;
     415             :             }
     416             : 
     417       25123 :             avctx->profile = ff_h264_get_profile(sps);
     418       25123 :             avctx->level   = sps->level_idc;
     419             : 
     420       25123 :             if (sps->frame_mbs_only_flag) {
     421       17799 :                 p->picture_structure = PICT_FRAME;
     422             :             } else {
     423        7324 :                 if (get_bits1(&nal.gb)) { // field_pic_flag
     424        5489 :                     p->picture_structure = PICT_TOP_FIELD + get_bits1(&nal.gb); // bottom_field_flag
     425             :                 } else {
     426        1835 :                     p->picture_structure = PICT_FRAME;
     427             :                 }
     428             :             }
     429             : 
     430       25123 :             if (nal.type == H264_NAL_IDR_SLICE)
     431         570 :                 get_ue_golomb_long(&nal.gb); /* idr_pic_id */
     432       25123 :             if (sps->poc_type == 0) {
     433       18625 :                 p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
     434             : 
     435       21198 :                 if (p->ps.pps->pic_order_present == 1 &&
     436        2573 :                     p->picture_structure == PICT_FRAME)
     437        2005 :                     p->poc.delta_poc_bottom = get_se_golomb(&nal.gb);
     438             :             }
     439             : 
     440       28698 :             if (sps->poc_type == 1 &&
     441        3575 :                 !sps->delta_pic_order_always_zero_flag) {
     442        3071 :                 p->poc.delta_poc[0] = get_se_golomb(&nal.gb);
     443             : 
     444        3763 :                 if (p->ps.pps->pic_order_present == 1 &&
     445         692 :                     p->picture_structure == PICT_FRAME)
     446         406 :                     p->poc.delta_poc[1] = get_se_golomb(&nal.gb);
     447             :             }
     448             : 
     449             :             /* Decode POC of this picture.
     450             :              * The prev_ values needed for decoding POC of the next picture are not set here. */
     451       25123 :             field_poc[0] = field_poc[1] = INT_MAX;
     452       25123 :             ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
     453             :                              &p->poc, p->picture_structure, nal.ref_idc);
     454             : 
     455             :             /* Continue parsing to check if MMCO_RESET is present.
     456             :              * FIXME: MMCO_RESET could appear in non-first slice.
     457             :              *        Maybe, we should parse all undisposable non-IDR slice of this
     458             :              *        picture until encountering MMCO_RESET in a slice of it. */
     459       25123 :             if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
     460       15687 :                 got_reset = scan_mmco_reset(s, &nal.gb, avctx);
     461       15687 :                 if (got_reset < 0)
     462          63 :                     goto fail;
     463             :             }
     464             : 
     465             :             /* Set up the prev_ values for decoding POC of the next picture. */
     466       25060 :             p->poc.prev_frame_num        = got_reset ? 0 : p->poc.frame_num;
     467       25060 :             p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
     468       25060 :             if (nal.ref_idc != 0) {
     469       16194 :                 if (!got_reset) {
     470       16144 :                     p->poc.prev_poc_msb = p->poc.poc_msb;
     471       16144 :                     p->poc.prev_poc_lsb = p->poc.poc_lsb;
     472             :                 } else {
     473          50 :                     p->poc.prev_poc_msb = 0;
     474          50 :                     p->poc.prev_poc_lsb =
     475          50 :                         p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
     476             :                 }
     477             :             }
     478             : 
     479       25060 :             if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
     480        1193 :                 switch (p->sei.picture_timing.pic_struct) {
     481         358 :                 case H264_SEI_PIC_STRUCT_TOP_FIELD:
     482             :                 case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
     483         358 :                     s->repeat_pict = 0;
     484         358 :                     break;
     485         697 :                 case H264_SEI_PIC_STRUCT_FRAME:
     486             :                 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
     487             :                 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
     488         697 :                     s->repeat_pict = 1;
     489         697 :                     break;
     490         138 :                 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
     491             :                 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
     492         138 :                     s->repeat_pict = 2;
     493         138 :                     break;
     494           0 :                 case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
     495           0 :                     s->repeat_pict = 3;
     496           0 :                     break;
     497           0 :                 case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
     498           0 :                     s->repeat_pict = 5;
     499           0 :                     break;
     500           0 :                 default:
     501           0 :                     s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
     502           0 :                     break;
     503             :                 }
     504        1193 :             } else {
     505       23867 :                 s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
     506             :             }
     507             : 
     508       25060 :             if (p->picture_structure == PICT_FRAME) {
     509       19571 :                 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
     510       19571 :                 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
     511         835 :                     switch (p->sei.picture_timing.pic_struct) {
     512         327 :                     case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
     513             :                     case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
     514         327 :                         s->field_order = AV_FIELD_TT;
     515         327 :                         break;
     516         150 :                     case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
     517             :                     case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
     518         150 :                         s->field_order = AV_FIELD_BB;
     519         150 :                         break;
     520         358 :                     default:
     521         358 :                         s->field_order = AV_FIELD_PROGRESSIVE;
     522         358 :                         break;
     523             :                     }
     524         835 :                 } else {
     525       18736 :                     if (field_poc[0] < field_poc[1])
     526        1042 :                         s->field_order = AV_FIELD_TT;
     527       17694 :                     else if (field_poc[0] > field_poc[1])
     528           3 :                         s->field_order = AV_FIELD_BB;
     529             :                     else
     530       17691 :                         s->field_order = AV_FIELD_PROGRESSIVE;
     531             :                 }
     532             :             } else {
     533        5489 :                 if (p->picture_structure == PICT_TOP_FIELD)
     534        2748 :                     s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
     535             :                 else
     536        2741 :                     s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
     537        9765 :                 if (p->poc.frame_num == p->last_frame_num &&
     538        8552 :                     p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
     539        8552 :                     p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
     540        4276 :                     p->last_picture_structure != s->picture_structure) {
     541        8544 :                     if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
     542        2740 :                         s->field_order = AV_FIELD_TT;
     543             :                     else
     544        1532 :                         s->field_order = AV_FIELD_BB;
     545             :                 } else {
     546        1217 :                     s->field_order = AV_FIELD_UNKNOWN;
     547             :                 }
     548        5489 :                 p->last_picture_structure = s->picture_structure;
     549        5489 :                 p->last_frame_num = p->poc.frame_num;
     550             :             }
     551             : 
     552       25060 :             av_freep(&rbsp.rbsp_buffer);
     553       25060 :             return 0; /* no need to evaluate the rest */
     554             :         }
     555             :     }
     556           1 :     if (q264) {
     557           0 :         av_freep(&rbsp.rbsp_buffer);
     558           0 :         return 0;
     559             :     }
     560             :     /* didn't find a picture! */
     561           1 :     av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
     562         290 : fail:
     563         290 :     av_freep(&rbsp.rbsp_buffer);
     564         290 :     return -1;
     565             : }
     566             : 
     567      178831 : static int h264_parse(AVCodecParserContext *s,
     568             :                       AVCodecContext *avctx,
     569             :                       const uint8_t **poutbuf, int *poutbuf_size,
     570             :                       const uint8_t *buf, int buf_size)
     571             : {
     572      178831 :     H264ParseContext *p = s->priv_data;
     573      178831 :     ParseContext *pc = &p->pc;
     574             :     int next;
     575             : 
     576      178831 :     if (!p->got_first) {
     577         238 :         p->got_first = 1;
     578         238 :         if (avctx->extradata_size) {
     579          22 :             ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
     580             :                                      &p->ps, &p->is_avc, &p->nal_length_size,
     581             :                                      avctx->err_recognition, avctx);
     582             :         }
     583             :     }
     584             : 
     585      178831 :     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
     586        1780 :         next = buf_size;
     587             :     } else {
     588      177051 :         next = h264_find_frame_end(p, buf, buf_size, avctx);
     589             : 
     590      177051 :         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
     591      153247 :             *poutbuf      = NULL;
     592      153247 :             *poutbuf_size = 0;
     593      153247 :             return buf_size;
     594             :         }
     595             : 
     596       23804 :         if (next < 0 && next != END_NOT_FOUND) {
     597             :             av_assert1(pc->last_index + next >= 0);
     598         188 :             h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
     599             :         }
     600             :     }
     601             : 
     602       25584 :     parse_nal_units(s, avctx, buf, buf_size);
     603             : 
     604       25584 :     if (avctx->framerate.num)
     605       25017 :         avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
     606       25584 :     if (p->sei.picture_timing.cpb_removal_delay >= 0) {
     607         768 :         s->dts_sync_point    = p->sei.buffering_period.present;
     608         768 :         s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
     609         768 :         s->pts_dts_delta     = p->sei.picture_timing.dpb_output_delay;
     610             :     } else {
     611       24816 :         s->dts_sync_point    = INT_MIN;
     612       24816 :         s->dts_ref_dts_delta = INT_MIN;
     613       24816 :         s->pts_dts_delta     = INT_MIN;
     614             :     }
     615             : 
     616       25584 :     if (s->flags & PARSER_FLAG_ONCE) {
     617           0 :         s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
     618             :     }
     619             : 
     620       25584 :     if (s->dts_sync_point >= 0) {
     621         768 :         int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
     622         768 :         if (den > 0) {
     623         768 :             int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
     624         768 :             if (s->dts != AV_NOPTS_VALUE) {
     625             :                 // got DTS from the stream, update reference timestamp
     626         372 :                 p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
     627         396 :             } else if (p->reference_dts != AV_NOPTS_VALUE) {
     628             :                 // compute DTS based on reference timestamp
     629           0 :                 s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
     630             :             }
     631             : 
     632         768 :             if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
     633           0 :                 s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
     634             : 
     635         768 :             if (s->dts_sync_point > 0)
     636          30 :                 p->reference_dts = s->dts; // new reference
     637             :         }
     638             :     }
     639             : 
     640       25584 :     *poutbuf      = buf;
     641       25584 :     *poutbuf_size = buf_size;
     642       25584 :     return next;
     643             : }
     644             : 
     645           0 : static int h264_split(AVCodecContext *avctx,
     646             :                       const uint8_t *buf, int buf_size)
     647             : {
     648           0 :     uint32_t state = -1;
     649           0 :     int has_sps    = 0;
     650           0 :     int has_pps    = 0;
     651           0 :     const uint8_t *ptr = buf, *end = buf + buf_size;
     652             :     int nalu_type;
     653             : 
     654           0 :     while (ptr < end) {
     655           0 :         ptr = avpriv_find_start_code(ptr, end, &state);
     656           0 :         if ((state & 0xFFFFFF00) != 0x100)
     657           0 :             break;
     658           0 :         nalu_type = state & 0x1F;
     659           0 :         if (nalu_type == H264_NAL_SPS) {
     660           0 :             has_sps = 1;
     661           0 :         } else if (nalu_type == H264_NAL_PPS)
     662           0 :             has_pps = 1;
     663             :         /* else if (nalu_type == 0x01 ||
     664             :          *     nalu_type == 0x02 ||
     665             :          *     nalu_type == 0x05) {
     666             :          *  }
     667             :          */
     668           0 :         else if ((nalu_type != H264_NAL_SEI || has_pps) &&
     669           0 :                   nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
     670             :                   nalu_type != 0x0f) {
     671           0 :             if (has_sps) {
     672           0 :                 while (ptr - 4 > buf && ptr[-5] == 0)
     673           0 :                     ptr--;
     674           0 :                 return ptr - 4 - buf;
     675             :             }
     676             :         }
     677             :     }
     678             : 
     679           0 :     return 0;
     680             : }
     681             : 
     682         302 : static void h264_close(AVCodecParserContext *s)
     683             : {
     684         302 :     H264ParseContext *p = s->priv_data;
     685         302 :     ParseContext *pc = &p->pc;
     686             : 
     687         302 :     av_freep(&pc->buffer);
     688             : 
     689         302 :     ff_h264_sei_uninit(&p->sei);
     690         302 :     ff_h264_ps_uninit(&p->ps);
     691         302 : }
     692             : 
     693         302 : static av_cold int init(AVCodecParserContext *s)
     694             : {
     695         302 :     H264ParseContext *p = s->priv_data;
     696             : 
     697         302 :     p->reference_dts = AV_NOPTS_VALUE;
     698         302 :     p->last_frame_num = INT_MAX;
     699         302 :     ff_h264dsp_init(&p->h264dsp, 8, 1);
     700         302 :     return 0;
     701             : }
     702             : 
     703             : AVCodecParser ff_h264_parser = {
     704             :     .codec_ids      = { AV_CODEC_ID_H264 },
     705             :     .priv_data_size = sizeof(H264ParseContext),
     706             :     .parser_init    = init,
     707             :     .parser_parse   = h264_parse,
     708             :     .parser_close   = h264_close,
     709             :     .split          = h264_split,
     710             : };

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