mirror of https://github.com/FFmpeg/FFmpeg.git
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/*
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* FWSE demuxer |
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* Copyright (c) 2020 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "pcm.h" |
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static int fwse_probe(const AVProbeData *p) |
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{ |
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if (AV_RL32(p->buf) != MKTAG('F','W','S','E')) |
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return 0; |
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if (AV_RL32(p->buf+4) != 2 && AV_RL32(p->buf+4) != 3) |
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return 0; |
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if (AV_RL32(p->buf+16) != 1 && AV_RL32(p->buf+16) != 2) |
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return 0; |
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return AVPROBE_SCORE_MAX / 4 * 3; |
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} |
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static int fwse_read_header(AVFormatContext *s) |
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{ |
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unsigned start_offset, version; |
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AVIOContext *pb = s->pb; |
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AVCodecParameters *par; |
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AVStream *st; |
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avio_skip(pb, 4); |
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version = avio_rl32(pb); |
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if (version != 2 && version != 3) |
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return AVERROR_INVALIDDATA; |
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avio_skip(pb, 4); |
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start_offset = avio_rl32(pb); |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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par = st->codecpar; |
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par->codec_type = AVMEDIA_TYPE_AUDIO; |
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par->codec_id = AV_CODEC_ID_ADPCM_IMA_MTF; |
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par->format = AV_SAMPLE_FMT_S16; |
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par->channels = avio_rl32(pb); |
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if (par->channels != 1 && par->channels != 2) |
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return AVERROR_INVALIDDATA; |
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if (par->channels == 1) |
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par->channel_layout = AV_CH_LAYOUT_MONO; |
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else if (par->channels == 2) |
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par->channel_layout = AV_CH_LAYOUT_STEREO; |
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st->duration = avio_rl32(pb); |
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par->sample_rate = avio_rl32(pb); |
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if (par->sample_rate <= 0 || par->sample_rate > INT_MAX) |
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return AVERROR_INVALIDDATA; |
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par->block_align = 1; |
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avio_skip(pb, start_offset - avio_tell(pb)); |
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avpriv_set_pts_info(st, 64, 1, par->sample_rate); |
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return 0; |
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} |
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AVInputFormat ff_fwse_demuxer = { |
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.name = "fwse", |
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.long_name = NULL_IF_CONFIG_SMALL("Capcom's MT Framework sound"), |
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.read_probe = fwse_probe, |
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.read_header = fwse_read_header, |
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.read_packet = ff_pcm_read_packet, |
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.extensions = "fwse", |
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}; |
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