LCOV - code coverage report
Current view: top level - libavformat - h264dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 59 62 95.2 %
Date: 2017-12-15 11:05:35 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * RAW H.264 video demuxer
       3             :  * Copyright (c) 2008 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             : #include "libavcodec/get_bits.h"
      23             : #include "libavcodec/golomb.h"
      24             : #include "avformat.h"
      25             : #include "rawdec.h"
      26             : #include "libavcodec/internal.h"
      27             : 
      28             : #define MAX_SPS_COUNT          32
      29             : #define MAX_PPS_COUNT         256
      30             : 
      31        6130 : static int h264_probe(AVProbeData *p)
      32             : {
      33        6130 :     uint32_t code = -1;
      34        6130 :     int sps = 0, pps = 0, idr = 0, res = 0, sli = 0;
      35             :     int i, ret;
      36        6130 :     int pps_ids[MAX_PPS_COUNT+1] = {0};
      37        6130 :     int sps_ids[MAX_SPS_COUNT+1] = {0};
      38             :     unsigned pps_id, sps_id;
      39             :     GetBitContext gb;
      40             : 
      41   116666014 :     for (i = 0; i + 2 < p->buf_size; i++) {
      42   116660858 :         code = (code << 8) + p->buf[i];
      43   116660858 :         if ((code & 0xffffff00) == 0x100) {
      44       12761 :             int ref_idc = (code >> 5) & 3;
      45       12761 :             int type    = code & 0x1F;
      46             :             static const int8_t ref_zero[] = {
      47             :                  2,  0,  0,  0,  0, -1,  1, -1,
      48             :                 -1,  1,  1,  1,  1, -1,  2,  2,
      49             :                  2,  2,  2,  0,  2,  2,  2,  2,
      50             :                  2,  2,  2,  2,  2,  2,  2,  2
      51             :             };
      52             : 
      53       12761 :             if (code & 0x80) // forbidden_bit
      54         610 :                 return 0;
      55             : 
      56       12151 :             if (ref_zero[type] == 1 && ref_idc)
      57         230 :                 return 0;
      58       11921 :             if (ref_zero[type] == -1 && !ref_idc)
      59          73 :                 return 0;
      60       11848 :             if (ref_zero[type] == 2) {
      61        9999 :                 if (!(code == 0x100 && !p->buf[i + 1] && !p->buf[i + 2]))
      62        6083 :                     res++;
      63             :             }
      64             : 
      65       11848 :             ret = init_get_bits8(&gb, p->buf + i + 1, p->buf_size - i - 1);
      66       11848 :             if (ret < 0)
      67           0 :                 return 0;
      68             : 
      69       11848 :             switch (type) {
      70         420 :             case 1:
      71             :             case 5:
      72         420 :                 get_ue_golomb_long(&gb);
      73         420 :                 if (get_ue_golomb_long(&gb) > 9U)
      74          36 :                     return 0;
      75         384 :                 pps_id = get_ue_golomb_long(&gb);
      76         384 :                 if (pps_id > MAX_PPS_COUNT)
      77          18 :                     return 0;
      78         366 :                 if (!pps_ids[pps_id])
      79          54 :                     break;
      80             : 
      81         312 :                 if (type == 1)
      82          62 :                     sli++;
      83             :                 else
      84         250 :                     idr++;
      85         312 :                 break;
      86         231 :             case 7:
      87         231 :                 skip_bits(&gb, 14);
      88         231 :                 if (get_bits(&gb, 2))
      89           5 :                     return 0;
      90         226 :                 skip_bits(&gb, 8);
      91         226 :                 sps_id = get_ue_golomb_long(&gb);
      92         226 :                 if (sps_id > MAX_SPS_COUNT)
      93           0 :                     return 0;
      94         226 :                 sps_ids[sps_id] = 1;
      95         226 :                 sps++;
      96         226 :                 break;
      97         243 :             case 8:
      98         243 :                 pps_id = get_ue_golomb_long(&gb);
      99         243 :                 if (pps_id > MAX_PPS_COUNT)
     100           2 :                     return 0;
     101         241 :                 sps_id = get_ue_golomb_long(&gb);
     102         241 :                 if (sps_id > MAX_SPS_COUNT)
     103           0 :                     return 0;
     104         241 :                 if (!sps_ids[sps_id])
     105          11 :                     break;
     106         230 :                 pps_ids[pps_id] = 1;
     107         230 :                 pps++;
     108         230 :                 break;
     109             :             }
     110             :         }
     111             :     }
     112             :     ff_tlog(NULL, "sps:%d pps:%d idr:%d sli:%d res:%d\n", sps, pps, idr, sli, res);
     113             : 
     114        5156 :     if (sps && pps && (idr || sli > 3) && res < (sps + pps + idr))
     115         212 :         return AVPROBE_SCORE_EXTENSION + 1;  // 1 more than .mpg
     116             : 
     117        4944 :     return 0;
     118             : }
     119             : 
     120             : FF_DEF_RAWVIDEO_DEMUXER(h264, "raw H.264 video", h264_probe, "h26l,h264,264,avc", AV_CODEC_ID_H264)

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