sol.c 3.91 KB
Newer Older
1
/*
2
 * Sierra SOL demuxer
3 4
 * Copyright Konstantin Shishkov.
 *
5 6 7
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
8 9
 * modify it under the terms of the GNU Lesser General Public
 * 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 14 15 16 17
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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 24 25
 * Based on documents from Game Audio Player and own research
 */

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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

static int sol_probe(AVProbeData *p)
{
    /* check file header */
    uint16_t magic;
    magic=le2me_16(*((uint16_t*)p->buf));
    if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
        p->buf[2] == 'S' && p->buf[3] == 'O' &&
        p->buf[4] == 'L' && p->buf[5] == 0)
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

#define SOL_DPCM    1
#define SOL_16BIT   4
#define SOL_STEREO 16

50
static enum CodecID sol_codec_id(int magic, int type)
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
{
    if (magic == 0x0B8D)
    {
        if (type & SOL_DPCM) return CODEC_ID_SOL_DPCM;
        else return CODEC_ID_PCM_U8;
    }
    if (type & SOL_DPCM)
    {
        if (type & SOL_16BIT) return CODEC_ID_SOL_DPCM;
        else if (magic == 0x0C8D) return CODEC_ID_SOL_DPCM;
        else return CODEC_ID_SOL_DPCM;
    }
    if (type & SOL_16BIT) return CODEC_ID_PCM_S16LE;
    return CODEC_ID_PCM_U8;
}

static int sol_codec_type(int magic, int type)
{
    if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
    if (type & SOL_DPCM)
    {
        if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
        else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
        else return 2;//SOL_DPCM_NEW8;
    }
    return -1;
}

static int sol_channels(int magic, int type)
{
    if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
    return 2;
}
84

85 86 87 88 89
static int sol_read_header(AVFormatContext *s,
                          AVFormatParameters *ap)
{
    int size;
    unsigned int magic,tag;
90
    ByteIOContext *pb = s->pb;
91 92
    unsigned int id, channels, rate, type;
    enum CodecID codec;
93 94 95 96 97 98 99 100 101 102 103 104
    AVStream *st;

    /* check ".snd" header */
    magic = get_le16(pb);
    tag = get_le32(pb);
    if (tag != MKTAG('S', 'O', 'L', 0))
        return -1;
    rate = get_le16(pb);
    type = get_byte(pb);
    size = get_le32(pb);
    if (magic != 0x0B8D)
        get_byte(pb); /* newer SOLs contain padding byte */
105

106 107
    codec = sol_codec_id(magic, type);
    channels = sol_channels(magic, type);
108

109 110 111
    if (codec == CODEC_ID_SOL_DPCM)
        id = sol_codec_type(magic, type);
    else id = 0;
112

113 114 115 116
    /* now we are ready: build format streams */
    st = av_new_stream(s, 0);
    if (!st)
        return -1;
117 118 119 120
    st->codec->codec_type = CODEC_TYPE_AUDIO;
    st->codec->codec_tag = id;
    st->codec->codec_id = codec;
    st->codec->channels = channels;
121
    st->codec->sample_rate = rate;
122
    av_set_pts_info(st, 64, 1, rate);
123 124 125 126 127 128 129 130 131 132
    return 0;
}

#define MAX_SIZE 4096

static int sol_read_packet(AVFormatContext *s,
                          AVPacket *pkt)
{
    int ret;

133
    if (url_feof(s->pb))
134
        return AVERROR(EIO);
135
    ret= av_get_packet(s->pb, pkt, MAX_SIZE);
136 137 138 139 140 141 142 143
    pkt->stream_index = 0;

    /* note: we need to modify the packet size here to handle the last
       packet */
    pkt->size = ret;
    return 0;
}

144
AVInputFormat sol_demuxer = {
145
    "sol",
146
    NULL_IF_CONFIG_SMALL("Sierra SOL format"),
147 148 149 150
    0,
    sol_probe,
    sol_read_header,
    sol_read_packet,
151
    NULL,
152 153
    pcm_read_seek,
};