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81 lines
2.4 KiB
81 lines
2.4 KiB
/* |
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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 "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 AVInputFormat ff_mtaf_demuxer = { |
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.name = "mtaf", |
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.long_name = NULL_IF_CONFIG_SMALL("Konami PS2 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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.extensions = "mtaf", |
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};
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