| 1 | /*
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| 2 | * Sierra SOL decoder
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| 3 | * Copyright Konstantin Shishkov.
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| 4 | *
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| 5 | * This library is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU Lesser General Public
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| 7 | * License as published by the Free Software Foundation; either
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| 8 | * version 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * This library is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | * Lesser General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU Lesser General Public
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| 16 | * License along with this library; if not, write to the Free Software
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| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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| 18 | */
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| 19 |
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| 20 | /*
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| 21 | * Based on documents from Game Audio Player and own research
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| 22 | */
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| 23 |
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| 24 | #include "avformat.h"
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| 25 | #include "allformats.h"
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| 26 | #include "avi.h"
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| 27 | #include "bswap.h"
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| 28 |
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| 29 | /* if we don't know the size in advance */
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| 30 | #define AU_UNKOWN_SIZE ((uint32_t)(~0))
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| 31 |
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| 32 | static int sol_probe(AVProbeData *p)
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| 33 | {
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| 34 | /* check file header */
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| 35 | uint16_t magic;
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| 36 | if (p->buf_size <= 14)
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| 37 | return 0;
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| 38 | magic=le2me_16(*((uint16_t*)p->buf));
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| 39 | if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
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| 40 | p->buf[2] == 'S' && p->buf[3] == 'O' &&
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| 41 | p->buf[4] == 'L' && p->buf[5] == 0)
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| 42 | return AVPROBE_SCORE_MAX;
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| 43 | else
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| 44 | return 0;
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| 45 | }
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| 46 |
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| 47 | #define SOL_DPCM 1
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| 48 | #define SOL_16BIT 4
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| 49 | #define SOL_STEREO 16
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| 50 |
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| 51 | static int sol_codec_id(int magic, int type)
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| 52 | {
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| 53 | if (magic == 0x0B8D)
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| 54 | {
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| 55 | if (type & SOL_DPCM) return CODEC_ID_SOL_DPCM;
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| 56 | else return CODEC_ID_PCM_U8;
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| 57 | }
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| 58 | if (type & SOL_DPCM)
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| 59 | {
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| 60 | if (type & SOL_16BIT) return CODEC_ID_SOL_DPCM;
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| 61 | else if (magic == 0x0C8D) return CODEC_ID_SOL_DPCM;
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| 62 | else return CODEC_ID_SOL_DPCM;
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| 63 | }
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| 64 | if (type & SOL_16BIT) return CODEC_ID_PCM_S16LE;
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| 65 | return CODEC_ID_PCM_U8;
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| 66 | }
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| 67 |
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| 68 | static int sol_codec_type(int magic, int type)
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| 69 | {
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| 70 | if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
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| 71 | if (type & SOL_DPCM)
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| 72 | {
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| 73 | if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
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| 74 | else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
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| 75 | else return 2;//SOL_DPCM_NEW8;
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| 76 | }
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| 77 | return -1;
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| 78 | }
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| 79 |
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| 80 | static int sol_channels(int magic, int type)
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| 81 | {
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| 82 | if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
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| 83 | return 2;
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| 84 | }
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| 85 |
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| 86 | static int sol_read_header(AVFormatContext *s,
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| 87 | AVFormatParameters *ap)
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| 88 | {
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| 89 | int size;
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| 90 | unsigned int magic,tag;
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| 91 | ByteIOContext *pb = &s->pb;
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| 92 | unsigned int id, codec, channels, rate, type;
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| 93 | AVStream *st;
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| 94 |
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| 95 | /* check ".snd" header */
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| 96 | magic = get_le16(pb);
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| 97 | tag = get_le32(pb);
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| 98 | if (tag != MKTAG('S', 'O', 'L', 0))
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| 99 | return -1;
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| 100 | rate = get_le16(pb);
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| 101 | type = get_byte(pb);
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| 102 | size = get_le32(pb);
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| 103 | if (magic != 0x0B8D)
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| 104 | get_byte(pb); /* newer SOLs contain padding byte */
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| 105 |
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| 106 | codec = sol_codec_id(magic, type);
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| 107 | channels = sol_channels(magic, type);
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| 108 |
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| 109 | if (codec == CODEC_ID_SOL_DPCM)
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| 110 | id = sol_codec_type(magic, type);
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| 111 | else id = 0;
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| 112 |
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| 113 | /* now we are ready: build format streams */
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| 114 | st = av_new_stream(s, 0);
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| 115 | if (!st)
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| 116 | return -1;
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| 117 | st->codec->codec_type = CODEC_TYPE_AUDIO;
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| 118 | st->codec->codec_tag = id;
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| 119 | st->codec->codec_id = codec;
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| 120 | st->codec->channels = channels;
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| 121 | st->codec->sample_rate = rate;
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| 122 | av_set_pts_info(st, 64, 1, rate);
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| 123 | return 0;
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| 124 | }
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| 125 |
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| 126 | #define MAX_SIZE 4096
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| 127 |
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| 128 | static int sol_read_packet(AVFormatContext *s,
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| 129 | AVPacket *pkt)
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| 130 | {
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| 131 | int ret;
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| 132 |
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| 133 | if (url_feof(&s->pb))
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| 134 | return -EIO;
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| 135 | ret= av_get_packet(&s->pb, pkt, MAX_SIZE);
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| 136 | pkt->stream_index = 0;
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| 137 |
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| 138 | /* note: we need to modify the packet size here to handle the last
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| 139 | packet */
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| 140 | pkt->size = ret;
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| 141 | return 0;
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| 142 | }
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| 143 |
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| 144 | static int sol_read_close(AVFormatContext *s)
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| 145 | {
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| 146 | return 0;
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| 147 | }
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| 148 |
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| 149 | static AVInputFormat sol_demuxer = {
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| 150 | "sol",
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| 151 | "Sierra SOL Format",
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| 152 | 0,
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| 153 | sol_probe,
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| 154 | sol_read_header,
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| 155 | sol_read_packet,
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| 156 | sol_read_close,
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| 157 | pcm_read_seek,
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| 158 | };
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| 159 |
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| 160 | int sol_init(void)
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| 161 | {
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| 162 | av_register_input_format(&sol_demuxer);
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| 163 | return 0;
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| 164 | }
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