diff options
Diffstat (limited to 'ffmpeg/libavformat/sol.c')
| -rw-r--r-- | ffmpeg/libavformat/sol.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/sol.c b/ffmpeg/libavformat/sol.c new file mode 100644 index 0000000..77c754a --- /dev/null +++ b/ffmpeg/libavformat/sol.c @@ -0,0 +1,151 @@ +/* + * 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(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 (magic == 0x0B8D) + { + if (type & SOL_DPCM) return AV_CODEC_ID_SOL_DPCM; + else return AV_CODEC_ID_PCM_U8; + } + if (type & SOL_DPCM) + { + if (type & SOL_16BIT) return AV_CODEC_ID_SOL_DPCM; + else if (magic == 0x0C8D) return AV_CODEC_ID_SOL_DPCM; + else return AV_CODEC_ID_SOL_DPCM; + } + 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->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_tag = id; + st->codec->codec_id = codec; + st->codec->channels = channels; + st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO : + AV_CH_LAYOUT_STEREO; + st->codec->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 (url_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, +}; |