blob: 5796f8d23486a43f16a18a662bb9ab72e7142042
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->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 | |
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 |