LCOV - code coverage report
Current view: top level - libavformat - sol.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 49 61 80.3 %
Date: 2017-12-15 18:13:28 Functions: 6 6 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Sierra SOL demuxer
       3             :  * Copyright Konstantin Shishkov
       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             : /*
      23             :  * Based on documents from Game Audio Player and own research
      24             :  */
      25             : 
      26             : #include "libavutil/channel_layout.h"
      27             : #include "libavutil/intreadwrite.h"
      28             : #include "avformat.h"
      29             : #include "internal.h"
      30             : #include "pcm.h"
      31             : 
      32             : /* if we don't know the size in advance */
      33             : #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
      34             : 
      35        6130 : static int sol_probe(AVProbeData *p)
      36             : {
      37             :     /* check file header */
      38        6130 :     uint16_t magic = AV_RL32(p->buf);
      39        6131 :     if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
      40           3 :         p->buf[2] == 'S' && p->buf[3] == 'O' &&
      41           2 :         p->buf[4] == 'L' && p->buf[5] == 0)
      42           1 :         return AVPROBE_SCORE_MAX;
      43             :     else
      44        6129 :         return 0;
      45             : }
      46             : 
      47             : #define SOL_DPCM    1
      48             : #define SOL_16BIT   4
      49             : #define SOL_STEREO 16
      50             : 
      51           1 : static enum AVCodecID sol_codec_id(int magic, int type)
      52             : {
      53           1 :     if (type & SOL_DPCM)
      54           1 :         return AV_CODEC_ID_SOL_DPCM;
      55             : 
      56           0 :     if (magic == 0x0B8D)
      57           0 :         return AV_CODEC_ID_PCM_U8;
      58             : 
      59           0 :     if (type & SOL_16BIT)
      60           0 :         return AV_CODEC_ID_PCM_S16LE;
      61             : 
      62           0 :     return AV_CODEC_ID_PCM_U8;
      63             : }
      64             : 
      65           1 : static int sol_codec_type(int magic, int type)
      66             : {
      67           1 :     if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
      68           1 :     if (type & SOL_DPCM)
      69             :     {
      70           1 :         if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
      71           0 :         else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
      72           0 :         else return 2;//SOL_DPCM_NEW8;
      73             :     }
      74           0 :     return -1;
      75             : }
      76             : 
      77           1 : static int sol_channels(int magic, int type)
      78             : {
      79           1 :     if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
      80           1 :     return 2;
      81             : }
      82             : 
      83           1 : static int sol_read_header(AVFormatContext *s)
      84             : {
      85             :     unsigned int magic,tag;
      86           1 :     AVIOContext *pb = s->pb;
      87             :     unsigned int id, channels, rate, type;
      88             :     enum AVCodecID codec;
      89             :     AVStream *st;
      90             : 
      91             :     /* check ".snd" header */
      92           1 :     magic = avio_rl16(pb);
      93           1 :     tag = avio_rl32(pb);
      94           1 :     if (tag != MKTAG('S', 'O', 'L', 0))
      95           0 :         return -1;
      96           1 :     rate = avio_rl16(pb);
      97           1 :     type = avio_r8(pb);
      98           1 :     avio_skip(pb, 4); /* size */
      99           1 :     if (magic != 0x0B8D)
     100           1 :         avio_r8(pb); /* newer SOLs contain padding byte */
     101             : 
     102           1 :     codec = sol_codec_id(magic, type);
     103           1 :     channels = sol_channels(magic, type);
     104             : 
     105           1 :     if (codec == AV_CODEC_ID_SOL_DPCM)
     106           1 :         id = sol_codec_type(magic, type);
     107           0 :     else id = 0;
     108             : 
     109             :     /* now we are ready: build format streams */
     110           1 :     st = avformat_new_stream(s, NULL);
     111           1 :     if (!st)
     112           0 :         return -1;
     113           1 :     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     114           1 :     st->codecpar->codec_tag = id;
     115           1 :     st->codecpar->codec_id = codec;
     116           1 :     st->codecpar->channels = channels;
     117           1 :     st->codecpar->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
     118             :                                                    AV_CH_LAYOUT_STEREO;
     119           1 :     st->codecpar->sample_rate = rate;
     120           1 :     avpriv_set_pts_info(st, 64, 1, rate);
     121           1 :     return 0;
     122             : }
     123             : 
     124             : #define MAX_SIZE 4096
     125             : 
     126          75 : static int sol_read_packet(AVFormatContext *s,
     127             :                           AVPacket *pkt)
     128             : {
     129             :     int ret;
     130             : 
     131          75 :     if (avio_feof(s->pb))
     132           1 :         return AVERROR(EIO);
     133          74 :     ret= av_get_packet(s->pb, pkt, MAX_SIZE);
     134          74 :     if (ret < 0)
     135           0 :         return ret;
     136          74 :     pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
     137          74 :     pkt->stream_index = 0;
     138          74 :     return 0;
     139             : }
     140             : 
     141             : AVInputFormat ff_sol_demuxer = {
     142             :     .name           = "sol",
     143             :     .long_name      = NULL_IF_CONFIG_SMALL("Sierra SOL"),
     144             :     .read_probe     = sol_probe,
     145             :     .read_header    = sol_read_header,
     146             :     .read_packet    = sol_read_packet,
     147             :     .read_seek      = ff_pcm_read_seek,
     148             : };

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