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80 lines
2.4 KiB
80 lines
2.4 KiB
/* |
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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/channel_layout.h" |
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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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const 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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