mirror of https://git.videolan.org/git/ffmpeg.git
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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* MTAF demuxer
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* Copyright (c) 2016 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 "demux.h"
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#include "internal.h"
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static int mtaf_probe(const AVProbeData *p)
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{
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if (p->buf_size < 0x44)
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return 0;
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if (AV_RL32(p->buf) != MKTAG('M','T','A','F') ||
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AV_RL32(p->buf + 0x40) != MKTAG('H','E','A','D'))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int mtaf_read_header(AVFormatContext *s)
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{
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int stream_count;
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AVStream *st;
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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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avio_skip(s->pb, 0x5c);
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st->duration = avio_rl32(s->pb);
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avio_skip(s->pb, 1);
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stream_count = avio_r8(s->pb);
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if (!stream_count)
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return AVERROR_INVALIDDATA;
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MTAF;
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st->codecpar->ch_layout.nb_channels = 2 * stream_count;
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st->codecpar->sample_rate = 48000;
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st->codecpar->block_align = 0x110 * st->codecpar->ch_layout.nb_channels / 2;
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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avio_seek(s->pb, 0x800, SEEK_SET);
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return 0;
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}
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static int mtaf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVCodecParameters *par = s->streams[0]->codecpar;
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return av_get_packet(s->pb, pkt, par->block_align);
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}
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const FFInputFormat ff_mtaf_demuxer = {
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.p.name = "mtaf",
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.p.long_name = NULL_IF_CONFIG_SMALL("Konami PS2 MTAF"),
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.p.extensions = "mtaf",
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.read_probe = mtaf_probe,
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.read_header = mtaf_read_header,
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.read_packet = mtaf_read_packet,
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};
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