| /* |
| * Sierra SOL demuxer |
| * Copyright Konstantin Shishkov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * 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 |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * Based on documents from Game Audio Player and own research |
| */ |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "pcm.h" |
| |
| /* if we don't know the size in advance */ |
| #define AU_UNKNOWN_SIZE ((uint32_t)(~0)) |
| |
| static int sol_probe(const AVProbeData *p) |
| { |
| /* check file header */ |
| uint16_t magic = AV_RL32(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 |
| |
| static enum AVCodecID sol_codec_id(int magic, int type) |
| { |
| if (type & SOL_DPCM) |
| return AV_CODEC_ID_SOL_DPCM; |
| |
| if (magic == 0x0B8D) |
| return AV_CODEC_ID_PCM_U8; |
| |
| if (type & SOL_16BIT) |
| return AV_CODEC_ID_PCM_S16LE; |
| |
| return AV_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; |
| } |
| |
| static int sol_read_header(AVFormatContext *s) |
| { |
| unsigned int magic,tag; |
| AVIOContext *pb = s->pb; |
| unsigned int id, channels, rate, type; |
| enum AVCodecID codec; |
| AVStream *st; |
| |
| /* check ".snd" header */ |
| magic = avio_rl16(pb); |
| tag = avio_rl32(pb); |
| if (tag != MKTAG('S', 'O', 'L', 0)) |
| return -1; |
| rate = avio_rl16(pb); |
| type = avio_r8(pb); |
| avio_skip(pb, 4); /* size */ |
| if (magic != 0x0B8D) |
| avio_r8(pb); /* newer SOLs contain padding byte */ |
| |
| codec = sol_codec_id(magic, type); |
| channels = sol_channels(magic, type); |
| |
| if (codec == AV_CODEC_ID_SOL_DPCM) |
| id = sol_codec_type(magic, type); |
| else id = 0; |
| |
| /* now we are ready: build format streams */ |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return -1; |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_tag = id; |
| st->codecpar->codec_id = codec; |
| st->codecpar->channels = channels; |
| st->codecpar->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO : |
| AV_CH_LAYOUT_STEREO; |
| st->codecpar->sample_rate = rate; |
| avpriv_set_pts_info(st, 64, 1, rate); |
| return 0; |
| } |
| |
| #define MAX_SIZE 4096 |
| |
| static int sol_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| int ret; |
| |
| if (avio_feof(s->pb)) |
| return AVERROR(EIO); |
| ret= av_get_packet(s->pb, pkt, MAX_SIZE); |
| if (ret < 0) |
| return ret; |
| pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
| pkt->stream_index = 0; |
| return 0; |
| } |
| |
| AVInputFormat ff_sol_demuxer = { |
| .name = "sol", |
| .long_name = NULL_IF_CONFIG_SMALL("Sierra SOL"), |
| .read_probe = sol_probe, |
| .read_header = sol_read_header, |
| .read_packet = sol_read_packet, |
| .read_seek = ff_pcm_read_seek, |
| }; |