LCOV - code coverage report
Current view: top level - libavformat - m4vdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 29 30 96.7 %
Date: 2018-05-20 11:54:08 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * RAW MPEG-4 video demuxer
       3             :  * Copyright (c) 2006  Thijs Vermeir <thijs.vermeir@barco.com>
       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 "avformat.h"
      23             : #include "rawdec.h"
      24             : 
      25             : #define VOS_STARTCODE        0x1B0
      26             : #define USER_DATA_STARTCODE  0x1B2
      27             : #define GOP_STARTCODE        0x1B3
      28             : #define VISUAL_OBJ_STARTCODE 0x1B5
      29             : #define VOP_STARTCODE        0x1B6
      30             : #define SLICE_STARTCODE      0x1B7
      31             : #define EXT_STARTCODE        0x1B8
      32             : 
      33        6217 : static int mpeg4video_probe(AVProbeData *probe_packet)
      34             : {
      35        6217 :     uint32_t temp_buffer = -1;
      36        6217 :     int VO = 0, VOL = 0, VOP = 0, VISO = 0, res = 0;
      37        6217 :     int res_main = 0;
      38             :     int i;
      39             : 
      40   129801857 :     for (i = 0; i < probe_packet->buf_size; i++) {
      41   129795640 :         temp_buffer = (temp_buffer << 8) + probe_packet->buf[i];
      42   129795640 :         if (temp_buffer & 0xfffffe00)
      43   125570922 :             continue;
      44     4224718 :         if (temp_buffer < 2)
      45     4035189 :             continue;
      46             : 
      47      189529 :         if (temp_buffer == VOP_STARTCODE)
      48         164 :             VOP++;
      49      189365 :         else if (temp_buffer == VISUAL_OBJ_STARTCODE)
      50         675 :             VISO++;
      51      188690 :         else if (temp_buffer >= 0x100 && temp_buffer < 0x120)
      52       31948 :             VO++;
      53      156742 :         else if (temp_buffer >= 0x120 && temp_buffer < 0x130)
      54        1500 :             VOL++;
      55      155242 :         else if (temp_buffer == SLICE_STARTCODE || temp_buffer == EXT_STARTCODE)
      56         284 :             res_main++;
      57      154958 :         else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) &&
      58        2688 :                  !(0x1B9 < temp_buffer && temp_buffer < 0x1C4))
      59      154029 :             res++;
      60             :     }
      61             : 
      62             :     // res_main repesents the reserved codes within the "main" profile, they are
      63             :     // added to the reserved ones if it appears that this is a "main" profile
      64             :     // stream
      65        6217 :     if (res_main && 2*res_main < VOP)
      66           0 :         res += res_main;
      67             : 
      68        6217 :     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res == 0)
      69          48 :         return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;
      70             : 
      71        6169 :     if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && VOP+VO > 4)
      72           3 :         return AVPROBE_SCORE_EXTENSION/10;
      73        6166 :     return 0;
      74             : }
      75             : 
      76             : FF_DEF_RAWVIDEO_DEMUXER2(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v",
      77             :                          AV_CODEC_ID_MPEG4, AVFMT_GENERIC_INDEX | AVFMT_TS_DISCONT)

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