LCOV - code coverage report
Current view: top level - libavformat - mpegvideodec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 40 42 95.2 %
Date: 2017-12-14 01:15:32 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * RAW MPEG video demuxer
       3             :  * Copyright (c) 2002-2003 Fabrice Bellard
       4             :  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : #include "avformat.h"
      24             : #include "rawdec.h"
      25             : 
      26             : #include "libavutil/intreadwrite.h"
      27             : #include "libavcodec/internal.h"
      28             : 
      29             : #define SEQ_START_CODE          0x000001b3
      30             : #define GOP_START_CODE          0x000001b8
      31             : #define PICTURE_START_CODE      0x00000100
      32             : #define SLICE_START_CODE        0x00000101
      33             : #define PACK_START_CODE         0x000001ba
      34             : #define VIDEO_ID                0x000001e0
      35             : #define AUDIO_ID                0x000001c0
      36             : 
      37        6130 : static int mpegvideo_probe(AVProbeData *p)
      38             : {
      39        6130 :     uint32_t code= -1;
      40        6130 :     int pic=0, seq=0, slice=0, pspack=0, vpes=0, apes=0, res=0, sicle=0;
      41        6130 :     const uint8_t *ptr = p->buf, *end = ptr + p->buf_size;
      42        6130 :     uint32_t last = 0;
      43             :     int j;
      44             : 
      45       62630 :     while (ptr < end) {
      46       50370 :         ptr = avpriv_find_start_code(ptr, end, &code);
      47       50370 :         if ((code & 0xffffff00) == 0x100) {
      48       44294 :             switch(code){
      49         321 :             case     SEQ_START_CODE:
      50         321 :                 if (!(ptr[3 + 1 + 2] & 0x20))
      51          16 :                     break;
      52         305 :                 j = -1;
      53         305 :                 if (ptr[j + 8] & 2)
      54          20 :                     j+= 64;
      55         305 :                 if (j >= end - ptr)
      56           0 :                     break;
      57         305 :                 if (ptr[j + 8] & 1)
      58          40 :                     j+= 64;
      59         305 :                 if (j >= end - ptr)
      60           0 :                     break;
      61         305 :                 if (AV_RB24(ptr + j + 9) & 0xFFFFFE)
      62          59 :                     break;
      63         246 :                 seq++;
      64         246 :             break;
      65       16398 :             case PICTURE_START_CODE:   pic++; break;
      66          35 :             case    PACK_START_CODE: pspack++; break;
      67         163 :             case              0x1b6:
      68         163 :                                         res++; break;
      69             :             }
      70       44294 :             if (code >= SLICE_START_CODE && code <= 0x1af) {
      71       23983 :                 if (last >= SLICE_START_CODE && last <= 0x1af) {
      72       40734 :                     if (code >= last) slice++;
      73        3140 :                     else              sicle++;
      74             :                 }else{
      75        3616 :                     if (code == SLICE_START_CODE) slice++;
      76        2890 :                     else                          sicle++;
      77             :                 }
      78             :             }
      79       44294 :             if     ((code & 0x1f0) == VIDEO_ID)   vpes++;
      80       43743 :             else if((code & 0x1e0) == AUDIO_ID)   apes++;
      81       44294 :             last = code;
      82             :         }
      83             :     }
      84        6130 :     if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !apes && !res && slice > sicle) {
      85         222 :         if(vpes) return AVPROBE_SCORE_EXTENSION / 4;
      86         213 :         else     return pic>1 ? AVPROBE_SCORE_EXTENSION + 1 : AVPROBE_SCORE_EXTENSION / 2; // +1 for .mpg
      87             :     }
      88        5908 :     return 0;
      89             : }
      90             : 
      91             : FF_DEF_RAWVIDEO_DEMUXER(mpegvideo, "raw MPEG video", mpegvideo_probe, NULL, AV_CODEC_ID_MPEG1VIDEO)

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