LCOV - code coverage report
Current view: top level - libavformat - mj2kdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 14 17 82.4 %
Date: 2017-12-15 11:05:35 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * MJPEG 2000 Demuxer
       3             :  * Copyright (c) 2016 Ståle Kristoffersen
       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 "libavutil/intreadwrite.h"
      23             : #include "avformat.h"
      24             : #include "rawdec.h"
      25             : 
      26             : #if CONFIG_MJPEG_2000_DEMUXER
      27        6130 : static int mjpeg2000_probe(AVProbeData *p)
      28             : {
      29        6130 :     const uint8_t *b = p->buf;
      30             :     int i, marker, marker_size;
      31        6130 :     int frames = 0, invalid = 0;
      32             : 
      33   128250145 :     for (i = 0; i < p->buf_size - 5; i++) {
      34   128244015 :         if (AV_RB32(b) == 0xff4fff51){
      35           7 :             marker_size = AV_RB16(b+4);
      36           7 :             if (marker_size + i < p->buf_size - 4) {
      37           7 :                 marker = AV_RB8(b+4+marker_size);
      38           7 :                 if (marker == 0xff)
      39           1 :                     frames++;
      40             :                 else
      41           6 :                     invalid++;
      42             :             }
      43             :         }
      44   128244015 :         b += 1;
      45             :     }
      46        6130 :     if (invalid*4 + 1 < frames) {
      47           0 :         if (invalid == 0 && frames > 2)
      48           0 :             return AVPROBE_SCORE_EXTENSION / 2;
      49           0 :         return AVPROBE_SCORE_EXTENSION / 4;
      50             :     }
      51        6130 :     return 0;
      52             : }
      53             : FF_DEF_RAWVIDEO_DEMUXER2(mjpeg_2000, "raw MJPEG 2000 video", mjpeg2000_probe, "j2k", AV_CODEC_ID_JPEG2000, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
      54             : #endif

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