LCOV - code coverage report
Current view: top level - libavformat - aea.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 34 39 87.2 %
Date: 2017-12-16 13:57:32 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * MD STUDIO audio demuxer
       3             :  *
       4             :  * Copyright (c) 2009 Benjamin Larsson
       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 "libavutil/channel_layout.h"
      24             : #include "libavutil/intreadwrite.h"
      25             : #include "avformat.h"
      26             : #include "pcm.h"
      27             : 
      28             : #define AT1_SU_SIZE     212
      29             : 
      30        6130 : static int aea_read_probe(AVProbeData *p)
      31             : {
      32        6130 :     if (p->buf_size <= 2048+212)
      33        3069 :         return 0;
      34             : 
      35             :     /* Magic is '00 08 00 00' in little-endian*/
      36        3061 :     if (AV_RL32(p->buf)==0x800) {
      37             :         int ch, i;
      38          25 :         ch = p->buf[264];
      39             : 
      40          25 :         if (ch != 1 && ch != 2)
      41           0 :             return 0;
      42             : 
      43             :         /* Check so that the redundant bsm bytes and info bytes are valid
      44             :          * the block size mode bytes have to be the same
      45             :          * the info bytes have to be the same
      46             :          */
      47          25 :         for (i = 2048; i + 211 < p->buf_size; i+= 212) {
      48             :             int bsm_s, bsm_e, inb_s, inb_e;
      49          25 :             bsm_s = p->buf[0];
      50          25 :             inb_s = p->buf[1];
      51          25 :             inb_e = p->buf[210];
      52          25 :             bsm_e = p->buf[211];
      53             : 
      54          25 :             if (bsm_s != bsm_e || inb_s != inb_e)
      55          25 :                 return 0;
      56             :         }
      57           0 :         return AVPROBE_SCORE_MAX / 4 + 1;
      58             :     }
      59        3036 :     return 0;
      60             : }
      61             : 
      62           3 : static int aea_read_header(AVFormatContext *s)
      63             : {
      64           3 :     AVStream *st = avformat_new_stream(s, NULL);
      65           3 :     if (!st)
      66           0 :         return AVERROR(ENOMEM);
      67             : 
      68             :     /* Parse the amount of channels and skip to pos 2048(0x800) */
      69           3 :     avio_skip(s->pb, 264);
      70           3 :     st->codecpar->channels = avio_r8(s->pb);
      71           3 :     avio_skip(s->pb, 1783);
      72             : 
      73             : 
      74           3 :     st->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;
      75           3 :     st->codecpar->codec_id       = AV_CODEC_ID_ATRAC1;
      76           3 :     st->codecpar->sample_rate    = 44100;
      77           3 :     st->codecpar->bit_rate       = 292000;
      78             : 
      79           3 :     if (st->codecpar->channels != 1 && st->codecpar->channels != 2) {
      80           0 :         av_log(s, AV_LOG_ERROR, "Channels %d not supported!\n", st->codecpar->channels);
      81           0 :         return AVERROR_INVALIDDATA;
      82             :     }
      83             : 
      84           3 :     st->codecpar->channel_layout = (st->codecpar->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
      85             : 
      86           3 :     st->codecpar->block_align = AT1_SU_SIZE * st->codecpar->channels;
      87           3 :     return 0;
      88             : }
      89             : 
      90        2232 : static int aea_read_packet(AVFormatContext *s, AVPacket *pkt)
      91             : {
      92        2232 :     int ret = av_get_packet(s->pb, pkt, s->streams[0]->codecpar->block_align);
      93             : 
      94        2232 :     pkt->stream_index = 0;
      95        2232 :     if (ret <= 0)
      96           3 :         return AVERROR(EIO);
      97             : 
      98        2229 :     return ret;
      99             : }
     100             : 
     101             : AVInputFormat ff_aea_demuxer = {
     102             :     .name           = "aea",
     103             :     .long_name      = NULL_IF_CONFIG_SMALL("MD STUDIO audio"),
     104             :     .read_probe     = aea_read_probe,
     105             :     .read_header    = aea_read_header,
     106             :     .read_packet    = aea_read_packet,
     107             :     .read_seek      = ff_pcm_read_seek,
     108             :     .flags          = AVFMT_GENERIC_INDEX,
     109             :     .extensions     = "aea",
     110             : };

Generated by: LCOV version 1.13