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86 lines
2.9 KiB
86 lines
2.9 KiB
/* |
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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 FFInputFormat ff_apac_demuxer = { |
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.p.name = "apac", |
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.p.long_name = NULL_IF_CONFIG_SMALL("raw APAC"), |
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.p.extensions = "apc", |
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.p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS, |
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.p.priv_class = &ff_raw_demuxer_class, |
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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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.raw_codec_id = AV_CODEC_ID_APAC, |
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.priv_data_size = sizeof(FFRawDemuxerContext), |
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};
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