Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 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 (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 | |||
| 68 | static 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 | |||
| 80 | static int sol_channels(int magic, int type) |
||
| 81 | { |
||
| 82 | if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1; |
||
| 83 | return 2; |
||
| 84 | } |
||
| 85 | |||
| 86 | static 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 | |||
| 129 | static 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 | |||
| 144 | AVInputFormat 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 | }; |