| 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 | |
| 35 | static 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 | |
| 51 | static enum AVCodecID sol_codec_id(int magic, int type) |
| 52 | { |
| 53 | if (type & SOL_DPCM) |
| 54 | return AV_CODEC_ID_SOL_DPCM; |
| 55 | |
| 56 | if (magic == 0x0B8D) |
| 57 | return AV_CODEC_ID_PCM_U8; |
| 58 | |
| 59 | if (type & SOL_16BIT) |
| 60 | return AV_CODEC_ID_PCM_S16LE; |
| 61 | |
| 62 | return AV_CODEC_ID_PCM_U8; |
| 63 | } |
| 64 | |
| 65 | static int sol_codec_type(int magic, int type) |
| 66 | { |
| 67 | if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD; |
| 68 | if (type & SOL_DPCM) |
| 69 | { |
| 70 | if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16; |
| 71 | else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD; |
| 72 | else return 2;//SOL_DPCM_NEW8; |
| 73 | } |
| 74 | return -1; |
| 75 | } |
| 76 | |
| 77 | static int sol_channels(int magic, int type) |
| 78 | { |
| 79 | if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1; |
| 80 | return 2; |
| 81 | } |
| 82 | |
| 83 | static int sol_read_header(AVFormatContext *s) |
| 84 | { |
| 85 | unsigned int magic,tag; |
| 86 | AVIOContext *pb = s->pb; |
| 87 | unsigned int id, channels, rate, type; |
| 88 | enum AVCodecID codec; |
| 89 | AVStream *st; |
| 90 | |
| 91 | /* check ".snd" header */ |
| 92 | magic = avio_rl16(pb); |
| 93 | tag = avio_rl32(pb); |
| 94 | if (tag != MKTAG('S', 'O', 'L', 0)) |
| 95 | return -1; |
| 96 | rate = avio_rl16(pb); |
| 97 | type = avio_r8(pb); |
| 98 | avio_skip(pb, 4); /* size */ |
| 99 | if (magic != 0x0B8D) |
| 100 | avio_r8(pb); /* newer SOLs contain padding byte */ |
| 101 | |
| 102 | codec = sol_codec_id(magic, type); |
| 103 | channels = sol_channels(magic, type); |
| 104 | |
| 105 | if (codec == AV_CODEC_ID_SOL_DPCM) |
| 106 | id = sol_codec_type(magic, type); |
| 107 | else id = 0; |
| 108 | |
| 109 | /* now we are ready: build format streams */ |
| 110 | st = avformat_new_stream(s, NULL); |
| 111 | if (!st) |
| 112 | return -1; |
| 113 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 114 | st->codec->codec_tag = id; |
| 115 | st->codec->codec_id = codec; |
| 116 | st->codec->channels = channels; |
| 117 | st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO : |
| 118 | AV_CH_LAYOUT_STEREO; |
| 119 | st->codec->sample_rate = rate; |
| 120 | avpriv_set_pts_info(st, 64, 1, rate); |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | #define MAX_SIZE 4096 |
| 125 | |
| 126 | static int sol_read_packet(AVFormatContext *s, |
| 127 | AVPacket *pkt) |
| 128 | { |
| 129 | int ret; |
| 130 | |
| 131 | if (avio_feof(s->pb)) |
| 132 | return AVERROR(EIO); |
| 133 | ret= av_get_packet(s->pb, pkt, MAX_SIZE); |
| 134 | if (ret < 0) |
| 135 | return ret; |
| 136 | pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
| 137 | pkt->stream_index = 0; |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | AVInputFormat ff_sol_demuxer = { |
| 142 | .name = "sol", |
| 143 | .long_name = NULL_IF_CONFIG_SMALL("Sierra SOL"), |
| 144 | .read_probe = sol_probe, |
| 145 | .read_header = sol_read_header, |
| 146 | .read_packet = sol_read_packet, |
| 147 | .read_seek = ff_pcm_read_seek, |
| 148 | }; |