/* * APAC demuxer * Copyright (c) 2022 Paul B Mahol * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/intreadwrite.h"#include "avformat.h"#include "demux.h"#include "internal.h"#include "rawdec.h" static int apac_probe(const AVProbeData *p){    if (AV_RB32(p->buf) == MKBETAG('A','P','A','C') &&        AV_RB32(p->buf + 8) == MKBETAG('P','R','O','F') &&        AV_RB32(p->buf + 12) == MKBETAG('N','A','D',' '))        return AVPROBE_SCORE_MAX;     return 0;} static int apac_read_header(AVFormatContext *s){    AVIOContext *pb = s->pb;    uint32_t chunk_size;    AVStream *st;    int64_t pos;     avio_skip(pb, 16);    chunk_size = avio_rl32(pb);    avio_skip(pb, chunk_size);    if (avio_rb32(pb) != MKBETAG('P','F','M','T'))        return AVERROR_INVALIDDATA;    chunk_size = avio_rl32(pb);    pos = avio_tell(pb);    avio_skip(pb, 2);    st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;    st->codecpar->codec_id    = AV_CODEC_ID_APAC;    st->codecpar->ch_layout.nb_channels = avio_rl16(pb);    st->codecpar->sample_rate = avio_rl32(pb);    if (st->codecpar->ch_layout.nb_channels <= 0 ||        st->codecpar->ch_layout.nb_channels >  2 ||        st->codecpar->sample_rate <= 0)        return AVERROR_INVALIDDATA;    avio_skip(pb, 2);    st->codecpar->bits_per_coded_sample = avio_rl16(pb);    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);    avio_skip(pb, (chunk_size + pos) - avio_tell(pb) + (chunk_size & 1));    if (avio_rb32(pb) != MKBETAG('P','A','D',' '))        return AVERROR_INVALIDDATA;    avio_skip(pb, 4);     return 0;} const FFInputFormat ff_apac_demuxer = {    .p.name         = "apac",    .p.long_name    = NULL_IF_CONFIG_SMALL("raw APAC"),    .p.extensions   = "apc",    .p.flags        = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,    .p.priv_class   = &ff_raw_demuxer_class,    .read_probe     = apac_probe,    .read_header    = apac_read_header,    .read_packet    = ff_raw_read_partial_packet,    .raw_codec_id   = AV_CODEC_ID_APAC,    .priv_data_size = sizeof(FFRawDemuxerContext),};