LCOV - code coverage report
Current view: top level - libavcodec - h264_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 341 405 84.2 %
Date: 2018-05-20 11:54:08 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      177258 : 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      177258 :     ParseContext *pc = &p->pc;
      74             : 
      75      177258 :     int next_avc = p->is_avc ? 0 : buf_size;
      76             : //    mb_addr= pc->mb_addr - 1;
      77      177258 :     state = pc->state;
      78      177258 :     if (state > 13)
      79         166 :         state = 7;
      80             : 
      81      177258 :     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     2801661 :     for (i = 0; i < buf_size; i++) {
      85     2647777 :         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     2647777 :         if (state == 7) {
      99     1150182 :             i += p->h264dsp.startcode_find_candidate(buf + i, next_avc - i);
     100     1150182 :             if (i < next_avc)
     101      999161 :                 state = 2;
     102     1497595 :         } else if (state <= 2) {
     103     1151095 :             if (buf[i] == 1)
     104       90004 :                 state ^= 5;            // 2->7, 1->4, 0->5
     105     1061091 :             else if (buf[i])
     106      909394 :                 state = 7;
     107             :             else
     108      151697 :                 state >>= 1;           // 2->1, 1->0, 0->0
     109      346500 :         } else if (state <= 5) {
     110       65448 :             int nalu_type = buf[i] & 0x1F;
     111       65448 :             if (nalu_type == H264_NAL_SEI || nalu_type == H264_NAL_SPS ||
     112       51179 :                 nalu_type == H264_NAL_PPS || nalu_type == H264_NAL_AUD) {
     113       28947 :                 if (pc->frame_start_found) {
     114        7511 :                     i++;
     115        7511 :                     goto found;
     116             :                 }
     117       47219 :             } else if (nalu_type == H264_NAL_SLICE || nalu_type == H264_NAL_DPA ||
     118             :                        nalu_type == H264_NAL_IDR_SLICE) {
     119       46842 :                 state += 8;
     120       46842 :                 continue;
     121             :             }
     122       11095 :             state = 7;
     123             :         } else {
     124      281052 :             p->parse_history[p->parse_history_count++] = buf[i];
     125      281052 :             if (p->parse_history_count > 5) {
     126       46842 :                 unsigned int mb, last_mb = p->parse_last_mb;
     127             :                 GetBitContext gb;
     128             : 
     129       46842 :                 init_get_bits(&gb, p->parse_history, 8*p->parse_history_count);
     130       46842 :                 p->parse_history_count = 0;
     131       46842 :                 mb= get_ue_golomb_long(&gb);
     132       46842 :                 p->parse_last_mb = mb;
     133       46842 :                 if (pc->frame_start_found) {
     134       23249 :                     if (mb <= last_mb)
     135       15863 :                         goto found;
     136             :                 } else
     137       23593 :                     pc->frame_start_found = 1;
     138       30979 :                 state = 7;
     139             :             }
     140             :         }
     141             :     }
     142      153884 :     pc->state = state;
     143      153884 :     if (p->is_avc)
     144           0 :         return next_avc;
     145      153884 :     return END_NOT_FOUND;
     146             : 
     147       23374 : found:
     148       23374 :     pc->state             = 7;
     149       23374 :     pc->frame_start_found = 0;
     150       23374 :     if (p->is_avc)
     151           0 :         return next_avc;
     152       23374 :     return i - (state & 5) - 5 * (state > 7);
     153             : }
     154             : 
     155       15689 : static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb,
     156             :                            void *logctx)
     157             : {
     158             :     H264PredWeightTable pwt;
     159       15689 :     int slice_type_nos = s->pict_type & 3;
     160       15689 :     H264ParseContext *p = s->priv_data;
     161             :     int list_count, ref_count[2];
     162             : 
     163             : 
     164       15689 :     if (p->ps.pps->redundant_pic_cnt_present)
     165          50 :         get_ue_golomb(gb); // redundant_pic_count
     166             : 
     167       15689 :     if (slice_type_nos == AV_PICTURE_TYPE_B)
     168         383 :         get_bits1(gb); // direct_spatial_mv_pred
     169             : 
     170       15689 :     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       15684 :     if (slice_type_nos != AV_PICTURE_TYPE_I) {
     175             :         int list;
     176       28411 :         for (list = 0; list < list_count; list++) {
     177       14423 :             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       30308 :     if ((p->ps.pps->weighted_pred && slice_type_nos == AV_PICTURE_TYPE_P) ||
     203       14885 :         (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       15632 :     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       14187 :     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       25590 : static inline int parse_nal_units(AVCodecParserContext *s,
     242             :                                   AVCodecContext *avctx,
     243             :                                   const uint8_t * const buf, int buf_size)
     244             : {
     245       25590 :     H264ParseContext *p = s->priv_data;
     246       25590 :     H2645RBSP rbsp = { NULL };
     247       25590 :     H2645NAL nal = { NULL };
     248             :     int buf_index, next_avc;
     249             :     unsigned int pps_id;
     250             :     unsigned int slice_type;
     251       25590 :     int state = -1, got_reset = 0;
     252       25590 :     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       25590 :     s->pict_type         = AV_PICTURE_TYPE_I;
     258       25590 :     s->key_frame         = 0;
     259       25590 :     s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
     260             : 
     261       25590 :     ff_h264_sei_uninit(&p->sei);
     262       25590 :     p->sei.frame_packing.arrangement_cancel_flag = -1;
     263             : 
     264       25590 :     if (!buf_size)
     265         235 :         return 0;
     266             : 
     267       25355 :     av_fast_padded_malloc(&rbsp.rbsp_buffer, &rbsp.rbsp_buffer_alloc_size, buf_size);
     268       25355 :     if (!rbsp.rbsp_buffer)
     269           0 :         return AVERROR(ENOMEM);
     270             : 
     271       25355 :     buf_index     = 0;
     272       25355 :     next_avc      = p->is_avc ? 0 : buf_size;
     273       11553 :     for (;;) {
     274             :         const SPS *sps;
     275       36908 :         int src_length, consumed, nalsize = 0;
     276             : 
     277       36908 :         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       34587 :             buf_index = find_start_code(buf, buf_size, buf_index, next_avc);
     284       34587 :             if (buf_index >= buf_size)
     285           0 :                 break;
     286       34587 :             if (buf_index >= next_avc)
     287           0 :                 continue;
     288             :         }
     289       36907 :         src_length = next_avc - buf_index;
     290             : 
     291       36907 :         state = buf[buf_index];
     292       36907 :         switch (state & 0x1f) {
     293       25354 :         case H264_NAL_SLICE:
     294             :         case H264_NAL_IDR_SLICE:
     295             :             // Do not walk the whole buffer just to decode slice header
     296       25354 :             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       18910 :                 if (src_length > 60)
     300        9309 :                     src_length = 60;
     301             :             } else {
     302             :                 /* To decode up to MMCOs */
     303       15899 :                 if (src_length > 1000)
     304        8852 :                     src_length = 1000;
     305             :             }
     306       25354 :             break;
     307             :         }
     308       36907 :         consumed = ff_h2645_extract_rbsp(buf + buf_index, src_length, &rbsp, &nal, 1);
     309       36907 :         if (consumed < 0)
     310           0 :             break;
     311             : 
     312       36907 :         buf_index += consumed;
     313             : 
     314       36907 :         ret = init_get_bits8(&nal.gb, nal.data, nal.size);
     315       36907 :         if (ret < 0)
     316           0 :             goto fail;
     317       36907 :         get_bits1(&nal.gb);
     318       36907 :         nal.ref_idc = get_bits(&nal.gb, 2);
     319       36907 :         nal.type    = get_bits(&nal.gb, 5);
     320             : 
     321       36907 :         switch (nal.type) {
     322         775 :         case H264_NAL_SPS:
     323         775 :             ff_h264_decode_seq_parameter_set(&nal.gb, avctx, &p->ps, 0);
     324         775 :             break;
     325        6918 :         case H264_NAL_PPS:
     326        6918 :             ff_h264_decode_picture_parameter_set(&nal.gb, avctx, &p->ps,
     327             :                                                  nal.size_bits);
     328        6918 :             break;
     329        1463 :         case H264_NAL_SEI:
     330        1463 :             ff_h264_sei_decode(&p->sei, &nal.gb, &p->ps, avctx);
     331        1463 :             break;
     332         571 :         case H264_NAL_IDR_SLICE:
     333         571 :             s->key_frame = 1;
     334             : 
     335         571 :             p->poc.prev_frame_num        = 0;
     336         571 :             p->poc.prev_frame_num_offset = 0;
     337         571 :             p->poc.prev_poc_msb          =
     338         571 :             p->poc.prev_poc_lsb          = 0;
     339             :         /* fall through */
     340       25354 :         case H264_NAL_SLICE:
     341       25354 :             get_ue_golomb_long(&nal.gb);  // skip first_mb_in_slice
     342       25354 :             slice_type   = get_ue_golomb_31(&nal.gb);
     343       25354 :             s->pict_type = ff_h264_golomb_to_pict_type[slice_type % 5];
     344       25354 :             if (p->sei.recovery_point.recovery_frame_cnt >= 0) {
     345             :                 /* key frame, since recovery_frame_cnt is set */
     346          26 :                 s->key_frame = 1;
     347             :             }
     348       25354 :             pps_id = get_ue_golomb(&nal.gb);
     349       25354 :             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       25354 :             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       25128 :             av_buffer_unref(&p->ps.pps_ref);
     361       25128 :             av_buffer_unref(&p->ps.sps_ref);
     362       25128 :             p->ps.pps = NULL;
     363       25128 :             p->ps.sps = NULL;
     364       25128 :             p->ps.pps_ref = av_buffer_ref(p->ps.pps_list[pps_id]);
     365       25128 :             if (!p->ps.pps_ref)
     366           0 :                 goto fail;
     367       25128 :             p->ps.pps = (const PPS*)p->ps.pps_ref->data;
     368             : 
     369       25128 :             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       25128 :             p->ps.sps_ref = av_buffer_ref(p->ps.sps_list[p->ps.pps->sps_id]);
     376       25128 :             if (!p->ps.sps_ref)
     377           0 :                 goto fail;
     378       25128 :             p->ps.sps = (const SPS*)p->ps.sps_ref->data;
     379             : 
     380       25128 :             sps = p->ps.sps;
     381             : 
     382             :             // heuristic to detect non marked keyframes
     383       25128 :             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       25128 :             p->poc.frame_num = get_bits(&nal.gb, sps->log2_max_frame_num);
     387             : 
     388       25128 :             s->coded_width  = 16 * sps->mb_width;
     389       25128 :             s->coded_height = 16 * sps->mb_height;
     390       25128 :             s->width        = s->coded_width  - (sps->crop_right + sps->crop_left);
     391       25128 :             s->height       = s->coded_height - (sps->crop_top   + sps->crop_bottom);
     392       25128 :             if (s->width <= 0 || s->height <= 0) {
     393           0 :                 s->width  = s->coded_width;
     394           0 :                 s->height = s->coded_height;
     395             :             }
     396             : 
     397       25128 :             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       24771 :             case 8:
     409       24771 :                 if (sps->chroma_format_idc == 3)      s->format = AV_PIX_FMT_YUV444P;
     410       24412 :                 else if (sps->chroma_format_idc == 2) s->format = AV_PIX_FMT_YUV422P;
     411       24402 :                 else                                  s->format = AV_PIX_FMT_YUV420P;
     412       24771 :                 break;
     413           0 :             default:
     414           0 :                 s->format = AV_PIX_FMT_NONE;
     415             :             }
     416             : 
     417       25128 :             avctx->profile = ff_h264_get_profile(sps);
     418       25128 :             avctx->level   = sps->level_idc;
     419             : 
     420       25128 :             if (sps->frame_mbs_only_flag) {
     421       17804 :                 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       25128 :             if (nal.type == H264_NAL_IDR_SLICE)
     431         571 :                 get_ue_golomb_long(&nal.gb); /* idr_pic_id */
     432       25128 :             if (sps->poc_type == 0) {
     433       18630 :                 p->poc.poc_lsb = get_bits(&nal.gb, sps->log2_max_poc_lsb);
     434             : 
     435       21203 :                 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       28703 :             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       25128 :             field_poc[0] = field_poc[1] = INT_MAX;
     452       25128 :             ret = ff_h264_init_poc(field_poc, &s->output_picture_number, sps,
     453             :                              &p->poc, p->picture_structure, nal.ref_idc);
     454       25128 :             if (ret < 0)
     455           0 :                 goto fail;
     456             : 
     457             :             /* Continue parsing to check if MMCO_RESET is present.
     458             :              * FIXME: MMCO_RESET could appear in non-first slice.
     459             :              *        Maybe, we should parse all undisposable non-IDR slice of this
     460             :              *        picture until encountering MMCO_RESET in a slice of it. */
     461       25128 :             if (nal.ref_idc && nal.type != H264_NAL_IDR_SLICE) {
     462       15689 :                 got_reset = scan_mmco_reset(s, &nal.gb, avctx);
     463       15689 :                 if (got_reset < 0)
     464          63 :                     goto fail;
     465             :             }
     466             : 
     467             :             /* Set up the prev_ values for decoding POC of the next picture. */
     468       25065 :             p->poc.prev_frame_num        = got_reset ? 0 : p->poc.frame_num;
     469       25065 :             p->poc.prev_frame_num_offset = got_reset ? 0 : p->poc.frame_num_offset;
     470       25065 :             if (nal.ref_idc != 0) {
     471       16197 :                 if (!got_reset) {
     472       16147 :                     p->poc.prev_poc_msb = p->poc.poc_msb;
     473       16147 :                     p->poc.prev_poc_lsb = p->poc.poc_lsb;
     474             :                 } else {
     475          50 :                     p->poc.prev_poc_msb = 0;
     476          50 :                     p->poc.prev_poc_lsb =
     477          50 :                         p->picture_structure == PICT_BOTTOM_FIELD ? 0 : field_poc[0];
     478             :                 }
     479             :             }
     480             : 
     481       25065 :             if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
     482        1193 :                 switch (p->sei.picture_timing.pic_struct) {
     483         358 :                 case H264_SEI_PIC_STRUCT_TOP_FIELD:
     484             :                 case H264_SEI_PIC_STRUCT_BOTTOM_FIELD:
     485         358 :                     s->repeat_pict = 0;
     486         358 :                     break;
     487         697 :                 case H264_SEI_PIC_STRUCT_FRAME:
     488             :                 case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
     489             :                 case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
     490         697 :                     s->repeat_pict = 1;
     491         697 :                     break;
     492         138 :                 case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
     493             :                 case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
     494         138 :                     s->repeat_pict = 2;
     495         138 :                     break;
     496           0 :                 case H264_SEI_PIC_STRUCT_FRAME_DOUBLING:
     497           0 :                     s->repeat_pict = 3;
     498           0 :                     break;
     499           0 :                 case H264_SEI_PIC_STRUCT_FRAME_TRIPLING:
     500           0 :                     s->repeat_pict = 5;
     501           0 :                     break;
     502           0 :                 default:
     503           0 :                     s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
     504           0 :                     break;
     505             :                 }
     506        1193 :             } else {
     507       23872 :                 s->repeat_pict = p->picture_structure == PICT_FRAME ? 1 : 0;
     508             :             }
     509             : 
     510       25065 :             if (p->picture_structure == PICT_FRAME) {
     511       19576 :                 s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
     512       19576 :                 if (sps->pic_struct_present_flag && p->sei.picture_timing.present) {
     513         835 :                     switch (p->sei.picture_timing.pic_struct) {
     514         327 :                     case H264_SEI_PIC_STRUCT_TOP_BOTTOM:
     515             :                     case H264_SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
     516         327 :                         s->field_order = AV_FIELD_TT;
     517         327 :                         break;
     518         150 :                     case H264_SEI_PIC_STRUCT_BOTTOM_TOP:
     519             :                     case H264_SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
     520         150 :                         s->field_order = AV_FIELD_BB;
     521         150 :                         break;
     522         358 :                     default:
     523         358 :                         s->field_order = AV_FIELD_PROGRESSIVE;
     524         358 :                         break;
     525             :                     }
     526         835 :                 } else {
     527       18741 :                     if (field_poc[0] < field_poc[1])
     528        1042 :                         s->field_order = AV_FIELD_TT;
     529       17699 :                     else if (field_poc[0] > field_poc[1])
     530           3 :                         s->field_order = AV_FIELD_BB;
     531             :                     else
     532       17696 :                         s->field_order = AV_FIELD_PROGRESSIVE;
     533             :                 }
     534             :             } else {
     535        5489 :                 if (p->picture_structure == PICT_TOP_FIELD)
     536        2748 :                     s->picture_structure = AV_PICTURE_STRUCTURE_TOP_FIELD;
     537             :                 else
     538        2741 :                     s->picture_structure = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
     539        9765 :                 if (p->poc.frame_num == p->last_frame_num &&
     540        8552 :                     p->last_picture_structure != AV_PICTURE_STRUCTURE_UNKNOWN &&
     541        8552 :                     p->last_picture_structure != AV_PICTURE_STRUCTURE_FRAME &&
     542        4276 :                     p->last_picture_structure != s->picture_structure) {
     543        8544 :                     if (p->last_picture_structure == AV_PICTURE_STRUCTURE_TOP_FIELD)
     544        2740 :                         s->field_order = AV_FIELD_TT;
     545             :                     else
     546        1532 :                         s->field_order = AV_FIELD_BB;
     547             :                 } else {
     548        1217 :                     s->field_order = AV_FIELD_UNKNOWN;
     549             :                 }
     550        5489 :                 p->last_picture_structure = s->picture_structure;
     551        5489 :                 p->last_frame_num = p->poc.frame_num;
     552             :             }
     553             : 
     554       25065 :             av_freep(&rbsp.rbsp_buffer);
     555       25065 :             return 0; /* no need to evaluate the rest */
     556             :         }
     557             :     }
     558           1 :     if (q264) {
     559           0 :         av_freep(&rbsp.rbsp_buffer);
     560           0 :         return 0;
     561             :     }
     562             :     /* didn't find a picture! */
     563           1 :     av_log(avctx, AV_LOG_ERROR, "missing picture in access unit with size %d\n", buf_size);
     564         290 : fail:
     565         290 :     av_freep(&rbsp.rbsp_buffer);
     566         290 :     return -1;
     567             : }
     568             : 
     569      178849 : static int h264_parse(AVCodecParserContext *s,
     570             :                       AVCodecContext *avctx,
     571             :                       const uint8_t **poutbuf, int *poutbuf_size,
     572             :                       const uint8_t *buf, int buf_size)
     573             : {
     574      178849 :     H264ParseContext *p = s->priv_data;
     575      178849 :     ParseContext *pc = &p->pc;
     576             :     int next;
     577             : 
     578      178849 :     if (!p->got_first) {
     579         239 :         p->got_first = 1;
     580         239 :         if (avctx->extradata_size) {
     581          22 :             ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
     582             :                                      &p->ps, &p->is_avc, &p->nal_length_size,
     583             :                                      avctx->err_recognition, avctx);
     584             :         }
     585             :     }
     586             : 
     587      178849 :     if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
     588        1780 :         next = buf_size;
     589             :     } else {
     590      177069 :         next = h264_find_frame_end(p, buf, buf_size, avctx);
     591             : 
     592      177069 :         if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
     593      153259 :             *poutbuf      = NULL;
     594      153259 :             *poutbuf_size = 0;
     595      153259 :             return buf_size;
     596             :         }
     597             : 
     598       23810 :         if (next < 0 && next != END_NOT_FOUND) {
     599             :             av_assert1(pc->last_index + next >= 0);
     600         189 :             h264_find_frame_end(p, &pc->buffer[pc->last_index + next], -next, avctx); // update state
     601             :         }
     602             :     }
     603             : 
     604       25590 :     parse_nal_units(s, avctx, buf, buf_size);
     605             : 
     606       25590 :     if (avctx->framerate.num)
     607       25023 :         avctx->time_base = av_inv_q(av_mul_q(avctx->framerate, (AVRational){avctx->ticks_per_frame, 1}));
     608       25590 :     if (p->sei.picture_timing.cpb_removal_delay >= 0) {
     609         773 :         s->dts_sync_point    = p->sei.buffering_period.present;
     610         773 :         s->dts_ref_dts_delta = p->sei.picture_timing.cpb_removal_delay;
     611         773 :         s->pts_dts_delta     = p->sei.picture_timing.dpb_output_delay;
     612             :     } else {
     613       24817 :         s->dts_sync_point    = INT_MIN;
     614       24817 :         s->dts_ref_dts_delta = INT_MIN;
     615       24817 :         s->pts_dts_delta     = INT_MIN;
     616             :     }
     617             : 
     618       25590 :     if (s->flags & PARSER_FLAG_ONCE) {
     619           0 :         s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
     620             :     }
     621             : 
     622       25590 :     if (s->dts_sync_point >= 0) {
     623         773 :         int64_t den = avctx->time_base.den * (int64_t)avctx->pkt_timebase.num;
     624         773 :         if (den > 0) {
     625         773 :             int64_t num = avctx->time_base.num * (int64_t)avctx->pkt_timebase.den;
     626         773 :             if (s->dts != AV_NOPTS_VALUE) {
     627             :                 // got DTS from the stream, update reference timestamp
     628         372 :                 p->reference_dts = s->dts - av_rescale(s->dts_ref_dts_delta, num, den);
     629         401 :             } else if (p->reference_dts != AV_NOPTS_VALUE) {
     630             :                 // compute DTS based on reference timestamp
     631           0 :                 s->dts = p->reference_dts + av_rescale(s->dts_ref_dts_delta, num, den);
     632             :             }
     633             : 
     634         773 :             if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
     635           0 :                 s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
     636             : 
     637         773 :             if (s->dts_sync_point > 0)
     638          31 :                 p->reference_dts = s->dts; // new reference
     639             :         }
     640             :     }
     641             : 
     642       25590 :     *poutbuf      = buf;
     643       25590 :     *poutbuf_size = buf_size;
     644       25590 :     return next;
     645             : }
     646             : 
     647           0 : static int h264_split(AVCodecContext *avctx,
     648             :                       const uint8_t *buf, int buf_size)
     649             : {
     650           0 :     uint32_t state = -1;
     651           0 :     int has_sps    = 0;
     652           0 :     int has_pps    = 0;
     653           0 :     const uint8_t *ptr = buf, *end = buf + buf_size;
     654             :     int nalu_type;
     655             : 
     656           0 :     while (ptr < end) {
     657           0 :         ptr = avpriv_find_start_code(ptr, end, &state);
     658           0 :         if ((state & 0xFFFFFF00) != 0x100)
     659           0 :             break;
     660           0 :         nalu_type = state & 0x1F;
     661           0 :         if (nalu_type == H264_NAL_SPS) {
     662           0 :             has_sps = 1;
     663           0 :         } else if (nalu_type == H264_NAL_PPS)
     664           0 :             has_pps = 1;
     665             :         /* else if (nalu_type == 0x01 ||
     666             :          *     nalu_type == 0x02 ||
     667             :          *     nalu_type == 0x05) {
     668             :          *  }
     669             :          */
     670           0 :         else if ((nalu_type != H264_NAL_SEI || has_pps) &&
     671           0 :                   nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
     672             :                   nalu_type != 0x0f) {
     673           0 :             if (has_sps) {
     674           0 :                 while (ptr - 4 > buf && ptr[-5] == 0)
     675           0 :                     ptr--;
     676           0 :                 return ptr - 4 - buf;
     677             :             }
     678             :         }
     679             :     }
     680             : 
     681           0 :     return 0;
     682             : }
     683             : 
     684         281 : static void h264_close(AVCodecParserContext *s)
     685             : {
     686         281 :     H264ParseContext *p = s->priv_data;
     687         281 :     ParseContext *pc = &p->pc;
     688             : 
     689         281 :     av_freep(&pc->buffer);
     690             : 
     691         281 :     ff_h264_sei_uninit(&p->sei);
     692         281 :     ff_h264_ps_uninit(&p->ps);
     693         281 : }
     694             : 
     695         281 : static av_cold int init(AVCodecParserContext *s)
     696             : {
     697         281 :     H264ParseContext *p = s->priv_data;
     698             : 
     699         281 :     p->reference_dts = AV_NOPTS_VALUE;
     700         281 :     p->last_frame_num = INT_MAX;
     701         281 :     ff_h264dsp_init(&p->h264dsp, 8, 1);
     702         281 :     return 0;
     703             : }
     704             : 
     705             : AVCodecParser ff_h264_parser = {
     706             :     .codec_ids      = { AV_CODEC_ID_H264 },
     707             :     .priv_data_size = sizeof(H264ParseContext),
     708             :     .parser_init    = init,
     709             :     .parser_parse   = h264_parse,
     710             :     .parser_close   = h264_close,
     711             :     .split          = h264_split,
     712             : };

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