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
sol_probe(const AVProbeData * p)35 static int sol_probe(const 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
sol_codec_id(int magic,int type)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
sol_codec_type(int magic,int type)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
sol_channels(int magic,int type)77 static int sol_channels(int magic, int type)
78 {
79 if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
80 return 2;
81 }
82
sol_read_header(AVFormatContext * s)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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
114 st->codecpar->codec_tag = id;
115 st->codecpar->codec_id = codec;
116 st->codecpar->channels = channels;
117 st->codecpar->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
118 AV_CH_LAYOUT_STEREO;
119 st->codecpar->sample_rate = rate;
120 avpriv_set_pts_info(st, 64, 1, rate);
121 return 0;
122 }
123
124 #define MAX_SIZE 4096
125
sol_read_packet(AVFormatContext * s,AVPacket * pkt)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