Use enum typers instead of int.
[libav.git] / libavformat / sol.c
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/bswap.h"
27 #include "avformat.h"
28 #include "raw.h"
29
30 /* if we don't know the size in advance */
31 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
32
33 static int sol_probe(AVProbeData *p)
34 {
35 /* check file header */
36 uint16_t magic;
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 enum CodecID 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, channels, rate, type;
92 enum CodecID codec;
93 AVStream *st;
94
95 /* check ".snd" header */
96 magic = get_le16(pb);
97 tag = get_le32(pb);
98 if (tag != MKTAG('S', 'O', 'L', 0))
99 return -1;
100 rate = get_le16(pb);
101 type = get_byte(pb);
102 size = get_le32(pb);
103 if (magic != 0x0B8D)
104 get_byte(pb); /* newer SOLs contain padding byte */
105
106 codec = sol_codec_id(magic, type);
107 channels = sol_channels(magic, type);
108
109 if (codec == CODEC_ID_SOL_DPCM)
110 id = sol_codec_type(magic, type);
111 else id = 0;
112
113 /* now we are ready: build format streams */
114 st = av_new_stream(s, 0);
115 if (!st)
116 return -1;
117 st->codec->codec_type = CODEC_TYPE_AUDIO;
118 st->codec->codec_tag = id;
119 st->codec->codec_id = codec;
120 st->codec->channels = channels;
121 st->codec->sample_rate = rate;
122 av_set_pts_info(st, 64, 1, rate);
123 return 0;
124 }
125
126 #define MAX_SIZE 4096
127
128 static int sol_read_packet(AVFormatContext *s,
129 AVPacket *pkt)
130 {
131 int ret;
132
133 if (url_feof(s->pb))
134 return AVERROR(EIO);
135 ret= av_get_packet(s->pb, pkt, MAX_SIZE);
136 pkt->stream_index = 0;
137
138 /* note: we need to modify the packet size here to handle the last
139 packet */
140 pkt->size = ret;
141 return 0;
142 }
143
144 AVInputFormat sol_demuxer = {
145 "sol",
146 NULL_IF_CONFIG_SMALL("Sierra SOL format"),
147 0,
148 sol_probe,
149 sol_read_header,
150 sol_read_packet,
151 NULL,
152 pcm_read_seek,
153 };