/* * 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/bswap.h" #include "avformat.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; magic=av_le2ne16(*((uint16_t*)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 CodecID sol_codec_id(int magic, int type) { if (magic == 0x0B8D) { if (type & SOL_DPCM) return CODEC_ID_SOL_DPCM; else return CODEC_ID_PCM_U8; } if (type & SOL_DPCM) { if (type & SOL_16BIT) return CODEC_ID_SOL_DPCM; else if (magic == 0x0C8D) return CODEC_ID_SOL_DPCM; else return CODEC_ID_SOL_DPCM; } if (type & SOL_16BIT) return CODEC_ID_PCM_S16LE; return 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, AVFormatParameters *ap) { unsigned int magic,tag; AVIOContext *pb = s->pb; unsigned int id, channels, rate, type; enum CodecID 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 == CODEC_ID_SOL_DPCM) id = sol_codec_type(magic, type); else id = 0; /* now we are ready: build format streams */ st = av_new_stream(s, 0); 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->sample_rate = rate; av_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->stream_index = 0; /* note: we need to modify the packet size here to handle the last packet */ pkt->size = ret; return 0; } AVInputFormat ff_sol_demuxer = { "sol", NULL_IF_CONFIG_SMALL("Sierra SOL format"), 0, sol_probe, sol_read_header, sol_read_packet, NULL, pcm_read_seek, };