LCOV - code coverage report
Current view: top level - libavformat - loasdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 32 35 91.4 %
Date: 2017-12-14 08:27:08 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * LOAS AudioSyncStream 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 "libavutil/intreadwrite.h"
      23             : #include "libavutil/internal.h"
      24             : #include "avformat.h"
      25             : #include "internal.h"
      26             : #include "rawdec.h"
      27             : 
      28             : #define LOAS_SYNC_WORD 0x2b7
      29             : 
      30        6130 : static int loas_probe(AVProbeData *p)
      31             : {
      32        6130 :     int max_frames = 0, first_frames = 0;
      33             :     int fsize, frames;
      34        6130 :     const uint8_t *buf0 = p->buf;
      35             :     const uint8_t *buf2;
      36             :     const uint8_t *buf;
      37        6130 :     const uint8_t *end = buf0 + p->buf_size - 3;
      38        6130 :     buf = buf0;
      39             : 
      40    61308042 :     for (; buf < end; buf = buf2 + 1) {
      41    61301912 :         buf2 = buf;
      42             : 
      43    61320370 :         for (frames = 0; buf2 < end; frames++) {
      44    61317939 :             uint32_t header = AV_RB24(buf2);
      45    61317939 :             if ((header >> 13) != LOAS_SYNC_WORD)
      46    61299468 :                 break;
      47       18471 :             fsize = (header & 0x1FFF) + 3;
      48       18471 :             if (fsize < 7)
      49          13 :                 break;
      50       18458 :             fsize = FFMIN(fsize, end - buf2);
      51       18458 :             buf2 += fsize;
      52             :         }
      53    61301912 :         max_frames = FFMAX(max_frames, frames);
      54    61301912 :         if (buf == buf0)
      55        6130 :             first_frames = frames;
      56             :     }
      57             : 
      58        6130 :     if (first_frames >= 3)
      59           4 :         return AVPROBE_SCORE_EXTENSION + 1;
      60        6126 :     else if (max_frames > 100)
      61           0 :         return AVPROBE_SCORE_EXTENSION;
      62        6126 :     else if (max_frames >= 3)
      63           0 :         return AVPROBE_SCORE_EXTENSION / 2;
      64             :     else
      65        6126 :         return 0;
      66             : }
      67             : 
      68           1 : static int loas_read_header(AVFormatContext *s)
      69             : {
      70             :     AVStream *st;
      71             : 
      72           1 :     st = avformat_new_stream(s, NULL);
      73           1 :     if (!st)
      74           0 :         return AVERROR(ENOMEM);
      75             : 
      76           1 :     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
      77           1 :     st->codecpar->codec_id = s->iformat->raw_codec_id;
      78           1 :     st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
      79             : 
      80             :     //LCM of all possible AAC sample rates
      81           1 :     avpriv_set_pts_info(st, 64, 1, 28224000);
      82             : 
      83           1 :     return 0;
      84             : }
      85             : 
      86             : AVInputFormat ff_loas_demuxer = {
      87             :     .name           = "loas",
      88             :     .long_name      = NULL_IF_CONFIG_SMALL("LOAS AudioSyncStream"),
      89             :     .read_probe     = loas_probe,
      90             :     .read_header    = loas_read_header,
      91             :     .read_packet    = ff_raw_read_partial_packet,
      92             :     .flags= AVFMT_GENERIC_INDEX,
      93             :     .raw_codec_id = AV_CODEC_ID_AAC_LATM,
      94             : };

Generated by: LCOV version 1.13