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80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
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/*
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* DERF 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 derf_probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) != MKTAG('D','E','R','F'))
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return 0;
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if (AV_RL32(p->buf+4) != 1 && AV_RL32(p->buf+4) != 2)
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return 0;
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return AVPROBE_SCORE_MAX / 3 * 2;
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}
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static int derf_read_header(AVFormatContext *s)
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{
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unsigned data_size;
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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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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_DERF_DPCM;
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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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data_size = avio_rl32(pb);
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st->duration = data_size / par->channels;
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par->sample_rate = 22050;
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par->block_align = 1;
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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_derf_demuxer = {
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.name = "derf",
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.long_name = NULL_IF_CONFIG_SMALL("Xilam DERF"),
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.read_probe = derf_probe,
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.read_header = derf_read_header,
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.read_packet = ff_pcm_read_packet,
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.read_seek = ff_pcm_read_seek,
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.extensions = "adp",
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};
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