3 * Copyright Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
23 * Based on documents from Game Audio Player and own research
26 #include "libavutil/bswap.h"
30 /* if we don't know the size in advance */
31 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
33 static int sol_probe(AVProbeData *p)
35 /* check file header */
37 magic=av_le2ne16(*((uint16_t*)p->buf));
38 if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
39 p->buf[2] == 'S' && p->buf[3] == 'O' &&
40 p->buf[4] == 'L' && p->buf[5] == 0)
41 return AVPROBE_SCORE_MAX;
50 static enum CodecID sol_codec_id(int magic, int type)
54 if (type & SOL_DPCM) return CODEC_ID_SOL_DPCM;
55 else return CODEC_ID_PCM_U8;
59 if (type & SOL_16BIT) return CODEC_ID_SOL_DPCM;
60 else if (magic == 0x0C8D) return CODEC_ID_SOL_DPCM;
61 else return CODEC_ID_SOL_DPCM;
63 if (type & SOL_16BIT) return CODEC_ID_PCM_S16LE;
64 return CODEC_ID_PCM_U8;
67 static int sol_codec_type(int magic, int type)
69 if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
72 if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
73 else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
74 else return 2;//SOL_DPCM_NEW8;
79 static int sol_channels(int magic, int type)
81 if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
85 static int sol_read_header(AVFormatContext *s,
86 AVFormatParameters *ap)
88 unsigned int magic,tag;
89 AVIOContext *pb = s->pb;
90 unsigned int id, channels, rate, type;
94 /* check ".snd" header */
95 magic = avio_rl16(pb);
97 if (tag != MKTAG('S', 'O', 'L', 0))
101 avio_skip(pb, 4); /* size */
103 avio_r8(pb); /* newer SOLs contain padding byte */
105 codec = sol_codec_id(magic, type);
106 channels = sol_channels(magic, type);
108 if (codec == CODEC_ID_SOL_DPCM)
109 id = sol_codec_type(magic, type);
112 /* now we are ready: build format streams */
113 st = av_new_stream(s, 0);
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->sample_rate = rate;
121 av_set_pts_info(st, 64, 1, rate);
125 #define MAX_SIZE 4096
127 static int sol_read_packet(AVFormatContext *s,
134 ret= av_get_packet(s->pb, pkt, MAX_SIZE);
135 pkt->stream_index = 0;
137 /* note: we need to modify the packet size here to handle the last
143 AVInputFormat ff_sol_demuxer = {
145 .long_name = NULL_IF_CONFIG_SMALL("Sierra SOL format"),
146 .read_probe = sol_probe,
147 .read_header = sol_read_header,
148 .read_packet = sol_read_packet,
149 .read_seek = pcm_read_seek,