LCOV - code coverage report
Current view: top level - src/libavformat - avr.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 39 7.7 %
Date: 2017-04-29 01:39:13 Functions: 1 2 50.0 %

          Line data    Source code
       1             : /*
       2             :  * AVR demuxer
       3             :  * Copyright (c) 2012 Paul B Mahol
       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 "internal.h"
      25             : #include "pcm.h"
      26             : 
      27        5949 : static int avr_probe(AVProbeData *p)
      28             : {
      29        5949 :     if (AV_RL32(p->buf) != MKTAG('2', 'B', 'I', 'T'))
      30        5949 :         return 0;
      31             : 
      32           0 :     if (!AV_RB16(p->buf+12) || AV_RB16(p->buf+12) > 256) // channels
      33           0 :         return AVPROBE_SCORE_EXTENSION/2;
      34           0 :     if (AV_RB16(p->buf+14) > 256) // bps
      35           0 :         return AVPROBE_SCORE_EXTENSION/2;
      36             : 
      37           0 :     return AVPROBE_SCORE_EXTENSION;
      38             : }
      39             : 
      40           0 : static int avr_read_header(AVFormatContext *s)
      41             : {
      42             :     uint16_t chan, sign, bps;
      43             :     AVStream *st;
      44             : 
      45           0 :     st = avformat_new_stream(s, NULL);
      46           0 :     if (!st)
      47           0 :         return AVERROR(ENOMEM);
      48             : 
      49           0 :     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
      50             : 
      51           0 :     avio_skip(s->pb, 4); // magic
      52           0 :     avio_skip(s->pb, 8); // sample_name
      53             : 
      54           0 :     chan = avio_rb16(s->pb);
      55           0 :     if (!chan) {
      56           0 :         st->codecpar->channels = 1;
      57           0 :     } else if (chan == 0xFFFFu) {
      58           0 :         st->codecpar->channels = 2;
      59             :     } else {
      60           0 :         avpriv_request_sample(s, "chan %d", chan);
      61           0 :         return AVERROR_PATCHWELCOME;
      62             :     }
      63             : 
      64           0 :     st->codecpar->bits_per_coded_sample = bps = avio_rb16(s->pb);
      65             : 
      66           0 :     sign = avio_rb16(s->pb);
      67             : 
      68           0 :     avio_skip(s->pb, 2); // loop
      69           0 :     avio_skip(s->pb, 2); // midi
      70           0 :     avio_skip(s->pb, 1); // replay speed
      71             : 
      72           0 :     st->codecpar->sample_rate = avio_rb24(s->pb);
      73           0 :     avio_skip(s->pb, 4 * 3);
      74           0 :     avio_skip(s->pb, 2 * 3);
      75           0 :     avio_skip(s->pb, 20);
      76           0 :     avio_skip(s->pb, 64);
      77             : 
      78           0 :     st->codecpar->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign);
      79           0 :     if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
      80           0 :         avpriv_request_sample(s, "Bps %d and sign %d", bps, sign);
      81           0 :         return AVERROR_PATCHWELCOME;
      82             :     }
      83             : 
      84           0 :     st->codecpar->block_align = bps * st->codecpar->channels / 8;
      85             : 
      86           0 :     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
      87           0 :     return 0;
      88             : }
      89             : 
      90             : AVInputFormat ff_avr_demuxer = {
      91             :     .name           = "avr",
      92             :     .long_name      = NULL_IF_CONFIG_SMALL("AVR (Audio Visual Research)"),
      93             :     .read_probe     = avr_probe,
      94             :     .read_header    = avr_read_header,
      95             :     .read_packet    = ff_pcm_read_packet,
      96             :     .read_seek      = ff_pcm_read_seek,
      97             :     .extensions     = "avr",
      98             :     .flags          = AVFMT_GENERIC_INDEX,
      99             : };

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