mirror of
https://github.com/FFmpeg/FFmpeg.git
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115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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* ACE 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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static int ace_probe(const AVProbeData *p)
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{
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uint32_t asc;
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if (AV_RB32(p->buf) != MKBETAG('A','A','C',' '))
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return 0;
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if (p->buf_size < 0x44)
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return 0;
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asc = AV_RB32(p->buf + 0x40);
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if (asc < 0x44 || asc > p->buf_size - 4)
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return 0;
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if (AV_RB32(p->buf + asc) != MKBETAG('A','S','C',' '))
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return 0;
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return AVPROBE_SCORE_MAX / 2 + 1;
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}
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static int ace_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVCodecParameters *par;
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int ret, codec, rate, nb_channels;
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uint32_t asc_pos, size;
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AVStream *st;
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avio_skip(pb, 0x40);
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asc_pos = avio_rb32(pb);
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if (asc_pos < 0x44)
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return AVERROR_INVALIDDATA;
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avio_skip(pb, asc_pos - 0x44);
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if (avio_rb32(pb) != MKBETAG('A','S','C',' '))
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return AVERROR_INVALIDDATA;
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avio_skip(pb, 0xec);
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codec = avio_rb32(pb);
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nb_channels = avio_rb32(pb);
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if (nb_channels <= 0 || nb_channels > 8)
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return AVERROR_INVALIDDATA;
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size = avio_rb32(pb);
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if (size == 0)
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return AVERROR_INVALIDDATA;
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rate = avio_rb32(pb);
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if (rate <= 0)
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return AVERROR_INVALIDDATA;
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avio_skip(pb, 16);
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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->start_time = 0;
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par = st->codecpar;
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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par->ch_layout.nb_channels = nb_channels;
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par->sample_rate = rate;
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par->block_align = (codec == 4 ? 0x60 : codec == 5 ? 0x98 : 0xC0) * nb_channels;
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st->duration = (size / par->block_align) * 1024LL;
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par->codec_id = AV_CODEC_ID_ATRAC3;
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ret = ff_alloc_extradata(par, 14);
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if (ret < 0)
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return ret;
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AV_WL16(st->codecpar->extradata, 1);
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AV_WL16(st->codecpar->extradata+2, 2048 * nb_channels);
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AV_WL16(st->codecpar->extradata+4, 0);
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AV_WL16(st->codecpar->extradata+6, codec == 4 ? 1 : 0);
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AV_WL16(st->codecpar->extradata+8, codec == 4 ? 1 : 0);
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AV_WL16(st->codecpar->extradata+10, 1);
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AV_WL16(st->codecpar->extradata+12, 0);
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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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static int ace_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_ace_demuxer = {
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.name = "ace",
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.long_name = NULL_IF_CONFIG_SMALL("tri-Ace Audio Container"),
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.read_probe = ace_probe,
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.read_header = ace_read_header,
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.read_packet = ace_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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};
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