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