mirror of
https://github.com/librempeg/librempeg
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105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
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* Ensoniq Paris Audio File demuxer
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* Copyright (c) 2012 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 epaf_probe(AVProbeData *p)
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{
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if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&
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AV_RL32(p->buf + 8) == 1) ||
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(AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&
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AV_RN32(p->buf + 8) == 0)) &&
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!AV_RN32(p->buf + 4) && AV_RN32(p->buf + 12) &&
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AV_RN32(p->buf + 20))
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return AVPROBE_SCORE_MAX / 4 * 3;
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return 0;
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}
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static int epaf_read_header(AVFormatContext *s)
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{
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int le, sample_rate, codec, channels;
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AVStream *st;
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avio_skip(s->pb, 4);
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if (avio_rl32(s->pb))
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return AVERROR_INVALIDDATA;
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le = avio_rl32(s->pb);
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if (le && le != 1)
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return AVERROR_INVALIDDATA;
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if (le) {
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sample_rate = avio_rl32(s->pb);
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codec = avio_rl32(s->pb);
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channels = avio_rl32(s->pb);
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} else {
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sample_rate = avio_rb32(s->pb);
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codec = avio_rb32(s->pb);
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channels = avio_rb32(s->pb);
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}
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if (!channels || !sample_rate)
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return AVERROR_INVALIDDATA;
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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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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->channels = channels;
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st->codec->sample_rate = sample_rate;
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switch (codec) {
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case 0:
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st->codec->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;
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break;
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case 2:
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st->codec->codec_id = AV_CODEC_ID_PCM_S8;
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break;
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case 1:
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avpriv_request_sample(s, "24-bit Paris PCM format");
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default:
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return AVERROR_INVALIDDATA;
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}
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st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
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st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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if (avio_skip(s->pb, 2024) < 0)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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AVInputFormat ff_epaf_demuxer = {
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.name = "epaf",
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.long_name = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),
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.read_probe = epaf_probe,
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.read_header = epaf_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 = "paf,fap",
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.flags = AVFMT_GENERIC_INDEX,
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};
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