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https://git.ffmpeg.org/ffmpeg.git
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87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/*
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* APAC demuxer
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* Copyright (c) 2022 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 "demux.h"
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#include "internal.h"
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#include "rawdec.h"
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static int apac_probe(const AVProbeData *p)
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{
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if (AV_RB32(p->buf) == MKBETAG('A','P','A','C') &&
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AV_RB32(p->buf + 8) == MKBETAG('P','R','O','F') &&
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AV_RB32(p->buf + 12) == MKBETAG('N','A','D',' '))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int apac_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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uint32_t chunk_size;
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AVStream *st;
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int64_t pos;
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avio_skip(pb, 16);
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chunk_size = avio_rl32(pb);
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avio_skip(pb, chunk_size);
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if (avio_rb32(pb) != MKBETAG('P','F','M','T'))
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return AVERROR_INVALIDDATA;
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chunk_size = avio_rl32(pb);
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pos = avio_tell(pb);
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avio_skip(pb, 2);
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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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_APAC;
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st->codecpar->ch_layout.nb_channels = avio_rl16(pb);
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st->codecpar->sample_rate = avio_rl32(pb);
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if (st->codecpar->ch_layout.nb_channels <= 0 ||
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st->codecpar->ch_layout.nb_channels > 2 ||
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st->codecpar->sample_rate <= 0)
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return AVERROR_INVALIDDATA;
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avio_skip(pb, 2);
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st->codecpar->bits_per_coded_sample = avio_rl16(pb);
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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avio_skip(pb, (chunk_size + pos) - avio_tell(pb) + (chunk_size & 1));
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if (avio_rb32(pb) != MKBETAG('P','A','D',' '))
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return AVERROR_INVALIDDATA;
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avio_skip(pb, 4);
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return 0;
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}
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const AVInputFormat ff_apac_demuxer = {
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.name = "apac",
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.long_name = NULL_IF_CONFIG_SMALL("raw APAC"),
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.read_probe = apac_probe,
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.read_header = apac_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.extensions = "apc",
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.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
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.raw_codec_id = AV_CODEC_ID_APAC,
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.priv_data_size = sizeof(FFRawDemuxerContext),
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.priv_class = &ff_raw_demuxer_class,
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};
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