changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / sol.c
1 /*
2 * Sierra SOL decoder
3 * Copyright Konstantin Shishkov.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 /*
21 * Based on documents from Game Audio Player and own research
22 */
23
24 #include "avformat.h"
25 #include "avi.h"
26 #include "bswap.h"
27
28 /* if we don't know the size in advance */
29 #define AU_UNKOWN_SIZE ((uint32_t)(~0))
30
31 static int sol_probe(AVProbeData *p)
32 {
33 /* check file header */
34 uint16_t magic;
35 if (p->buf_size <= 14)
36 return 0;
37 magic=le2me_16(*((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;
42 else
43 return 0;
44 }
45
46 #define SOL_DPCM 1
47 #define SOL_16BIT 4
48 #define SOL_STEREO 16
49
50 static int sol_codec_id(int magic, int type)
51 {
52 if (magic == 0x0B8D)
53 {
54 if (type & SOL_DPCM) return CODEC_ID_SOL_DPCM;
55 else return CODEC_ID_PCM_U8;
56 }
57 if (type & SOL_DPCM)
58 {
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;
62 }
63 if (type & SOL_16BIT) return CODEC_ID_PCM_S16LE;
64 return CODEC_ID_PCM_U8;
65 }
66
67 static int sol_codec_type(int magic, int type)
68 {
69 if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
70 if (type & SOL_DPCM)
71 {
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;
75 }
76 return -1;
77 }
78
79 static int sol_channels(int magic, int type)
80 {
81 if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
82 return 2;
83 }
84
85 static int sol_read_header(AVFormatContext *s,
86 AVFormatParameters *ap)
87 {
88 int size;
89 unsigned int magic,tag;
90 ByteIOContext *pb = &s->pb;
91 unsigned int id, codec, channels, rate, type;
92 AVStream *st;
93
94 /* check ".snd" header */
95 magic = get_le16(pb);
96 tag = get_le32(pb);
97 if (tag != MKTAG('S', 'O', 'L', 0))
98 return -1;
99 rate = get_le16(pb);
100 type = get_byte(pb);
101 size = get_le32(pb);
102 if (magic != 0x0B8D)
103 get_byte(pb); /* newer SOLs contain padding byte */
104
105 codec = sol_codec_id(magic, type);
106 channels = sol_channels(magic, type);
107
108 if (codec == 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 = av_new_stream(s, 0);
114 if (!st)
115 return -1;
116 st->codec->codec_type = CODEC_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);
122 return 0;
123 }
124
125 #define MAX_SIZE 4096
126
127 static int sol_read_packet(AVFormatContext *s,
128 AVPacket *pkt)
129 {
130 int ret;
131
132 if (url_feof(&s->pb))
133 return -EIO;
134 ret= av_get_packet(&s->pb, pkt, MAX_SIZE);
135 pkt->stream_index = 0;
136
137 /* note: we need to modify the packet size here to handle the last
138 packet */
139 pkt->size = ret;
140 return 0;
141 }
142
143 static int sol_read_close(AVFormatContext *s)
144 {
145 return 0;
146 }
147
148 static AVInputFormat sol_iformat = {
149 "sol",
150 "Sierra SOL Format",
151 0,
152 sol_probe,
153 sol_read_header,
154 sol_read_packet,
155 sol_read_close,
156 pcm_read_seek,
157 };
158
159 int sol_init(void)
160 {
161 av_register_input_format(&sol_iformat);
162 return 0;
163 }