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  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 (magic == 0x0B8D)
  54.     {
  55.         if (type & SOL_DPCM) return AV_CODEC_ID_SOL_DPCM;
  56.         else return AV_CODEC_ID_PCM_U8;
  57.     }
  58.     if (type & SOL_DPCM)
  59.     {
  60.         if (type & SOL_16BIT) return AV_CODEC_ID_SOL_DPCM;
  61.         else if (magic == 0x0C8D) return AV_CODEC_ID_SOL_DPCM;
  62.         else return AV_CODEC_ID_SOL_DPCM;
  63.     }
  64.     if (type & SOL_16BIT) return AV_CODEC_ID_PCM_S16LE;
  65.     return AV_CODEC_ID_PCM_U8;
  66. }
  67.  
  68. static int sol_codec_type(int magic, int type)
  69. {
  70.     if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
  71.     if (type & SOL_DPCM)
  72.     {
  73.         if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
  74.         else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
  75.         else return 2;//SOL_DPCM_NEW8;
  76.     }
  77.     return -1;
  78. }
  79.  
  80. static int sol_channels(int magic, int type)
  81. {
  82.     if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
  83.     return 2;
  84. }
  85.  
  86. static int sol_read_header(AVFormatContext *s)
  87. {
  88.     unsigned int magic,tag;
  89.     AVIOContext *pb = s->pb;
  90.     unsigned int id, channels, rate, type;
  91.     enum AVCodecID codec;
  92.     AVStream *st;
  93.  
  94.     /* check ".snd" header */
  95.     magic = avio_rl16(pb);
  96.     tag = avio_rl32(pb);
  97.     if (tag != MKTAG('S', 'O', 'L', 0))
  98.         return -1;
  99.     rate = avio_rl16(pb);
  100.     type = avio_r8(pb);
  101.     avio_skip(pb, 4); /* size */
  102.     if (magic != 0x0B8D)
  103.         avio_r8(pb); /* newer SOLs contain padding byte */
  104.  
  105.     codec = sol_codec_id(magic, type);
  106.     channels = sol_channels(magic, type);
  107.  
  108.     if (codec == AV_CODEC_ID_SOL_DPCM)
  109.         id = sol_codec_type(magic, type);
  110.     else id = 0;
  111.  
  112.     /* now we are ready: build format streams */
  113.     st = avformat_new_stream(s, NULL);
  114.     if (!st)
  115.         return -1;
  116.     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  117.     st->codec->codec_tag = id;
  118.     st->codec->codec_id = codec;
  119.     st->codec->channels = channels;
  120.     st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
  121.                                                 AV_CH_LAYOUT_STEREO;
  122.     st->codec->sample_rate = rate;
  123.     avpriv_set_pts_info(st, 64, 1, rate);
  124.     return 0;
  125. }
  126.  
  127. #define MAX_SIZE 4096
  128.  
  129. static int sol_read_packet(AVFormatContext *s,
  130.                           AVPacket *pkt)
  131. {
  132.     int ret;
  133.  
  134.     if (url_feof(s->pb))
  135.         return AVERROR(EIO);
  136.     ret= av_get_packet(s->pb, pkt, MAX_SIZE);
  137.     if (ret < 0)
  138.         return ret;
  139.     pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
  140.     pkt->stream_index = 0;
  141.     return 0;
  142. }
  143.  
  144. AVInputFormat ff_sol_demuxer = {
  145.     .name           = "sol",
  146.     .long_name      = NULL_IF_CONFIG_SMALL("Sierra SOL"),
  147.     .read_probe     = sol_probe,
  148.     .read_header    = sol_read_header,
  149.     .read_packet    = sol_read_packet,
  150.     .read_seek      = ff_pcm_read_seek,
  151. };
  152.