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2ba45a60 DM |
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 (avio_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 | }; |