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
35static 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
51static 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
68static 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
80static int sol_channels(int magic, int type)
81{
82    if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
83    return 2;
84}
85
86static 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
129static int sol_read_packet(AVFormatContext *s,
130                          AVPacket *pkt)
131{
132    int ret;
133
134    if (url_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
144AVInputFormat 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};
152