Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | RSS feed

  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. static int sol_probe(AVProbeData *p)
  36. {
  37.     /* check file header */
  38.     uint16_t magic = AV_RL32(p->buf);
  39.     if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
  40.         p->buf[2] == 'S' && p->buf[3] == 'O' &&
  41.         p->buf[4] == 'L' && p->buf[5] == 0)
  42.         return AVPROBE_SCORE_MAX;
  43.     else
  44.         return 0;
  45. }
  46.  
  47. #define SOL_DPCM    1
  48. #define SOL_16BIT   4
  49. #define SOL_STEREO 16
  50.  
  51. static enum AVCodecID sol_codec_id(int magic, int type)
  52. {
  53.     if (type & SOL_DPCM)
  54.         return AV_CODEC_ID_SOL_DPCM;
  55.  
  56.     if (magic == 0x0B8D)
  57.         return AV_CODEC_ID_PCM_U8;
  58.  
  59.     if (type & SOL_16BIT)
  60.         return AV_CODEC_ID_PCM_S16LE;
  61.  
  62.     return AV_CODEC_ID_PCM_U8;
  63. }
  64.  
  65. static int sol_codec_type(int magic, int type)
  66. {
  67.     if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
  68.     if (type & SOL_DPCM)
  69.     {
  70.         if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
  71.         else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
  72.         else return 2;//SOL_DPCM_NEW8;
  73.     }
  74.     return -1;
  75. }
  76.  
  77. static int sol_channels(int magic, int type)
  78. {
  79.     if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
  80.     return 2;
  81. }
  82.  
  83. static int sol_read_header(AVFormatContext *s)
  84. {
  85.     unsigned int magic,tag;
  86.     AVIOContext *pb = s->pb;
  87.     unsigned int id, channels, rate, type;
  88.     enum AVCodecID codec;
  89.     AVStream *st;
  90.  
  91.     /* check ".snd" header */
  92.     magic = avio_rl16(pb);
  93.     tag = avio_rl32(pb);
  94.     if (tag != MKTAG('S', 'O', 'L', 0))
  95.         return -1;
  96.     rate = avio_rl16(pb);
  97.     type = avio_r8(pb);
  98.     avio_skip(pb, 4); /* size */
  99.     if (magic != 0x0B8D)
  100.         avio_r8(pb); /* newer SOLs contain padding byte */
  101.  
  102.     codec = sol_codec_id(magic, type);
  103.     channels = sol_channels(magic, type);
  104.  
  105.     if (codec == AV_CODEC_ID_SOL_DPCM)
  106.         id = sol_codec_type(magic, type);
  107.     else id = 0;
  108.  
  109.     /* now we are ready: build format streams */
  110.     st = avformat_new_stream(s, NULL);
  111.     if (!st)
  112.         return -1;
  113.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  114.     st->codec->codec_tag = id;
  115.     st->codec->codec_id = codec;
  116.     st->codec->channels = channels;
  117.     st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
  118.                                                 AV_CH_LAYOUT_STEREO;
  119.     st->codec->sample_rate = rate;
  120.     avpriv_set_pts_info(st, 64, 1, rate);
  121.     return 0;
  122. }
  123.  
  124. #define MAX_SIZE 4096
  125.  
  126. static int sol_read_packet(AVFormatContext *s,
  127.                           AVPacket *pkt)
  128. {
  129.     int ret;
  130.  
  131.     if (avio_feof(s->pb))
  132.         return AVERROR(EIO);
  133.     ret= av_get_packet(s->pb, pkt, MAX_SIZE);
  134.     if (ret < 0)
  135.         return ret;
  136.     pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
  137.     pkt->stream_index = 0;
  138.     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. };
  149.