/* * ACE demuxer * Copyright (c) 2020 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" static int ace_probe(const AVProbeData *p){    uint32_t asc;     if (AV_RB32(p->buf) != MKBETAG('A','A','C',' '))        return 0;    if (p->buf_size < 0x44)        return 0;    asc = AV_RB32(p->buf + 0x40);    if (asc < 0x44 || asc > p->buf_size - 4)        return 0;    if (AV_RB32(p->buf + asc) != MKBETAG('A','S','C',' '))        return 0;     return AVPROBE_SCORE_MAX / 2 + 1;} static int ace_read_header(AVFormatContext *s){    AVIOContext *pb = s->pb;    AVCodecParameters *par;    int ret, codec, rate, nb_channels;    uint32_t asc_pos, size;    AVStream *st;     avio_skip(pb, 0x40);    asc_pos = avio_rb32(pb);    if (asc_pos < 0x44)        return AVERROR_INVALIDDATA;    avio_skip(pb, asc_pos - 0x44);    if (avio_rb32(pb) != MKBETAG('A','S','C',' '))        return AVERROR_INVALIDDATA;    avio_skip(pb, 0xec);    codec = avio_rb32(pb);    nb_channels = avio_rb32(pb);    if (nb_channels <= 0 || nb_channels > 8)        return AVERROR_INVALIDDATA;    size = avio_rb32(pb);    if (size == 0)        return AVERROR_INVALIDDATA;    rate = avio_rb32(pb);    if (rate <= 0)        return AVERROR_INVALIDDATA;    avio_skip(pb, 16);     st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);    st->start_time = 0;    par = st->codecpar;    par->codec_type  = AVMEDIA_TYPE_AUDIO;    par->ch_layout.nb_channels = nb_channels;    par->sample_rate = rate;    par->block_align = (codec == 4 ? 0x60 : codec == 5 ? 0x98 : 0xC0) * nb_channels;    st->duration     = (size / par->block_align) * 1024LL;    par->codec_id    = AV_CODEC_ID_ATRAC3;     ret = ff_alloc_extradata(par, 14);    if (ret < 0)        return ret;     AV_WL16(st->codecpar->extradata, 1);    AV_WL16(st->codecpar->extradata+2, 2048 * nb_channels);    AV_WL16(st->codecpar->extradata+4, 0);    AV_WL16(st->codecpar->extradata+6, codec == 4 ? 1 : 0);    AV_WL16(st->codecpar->extradata+8, codec == 4 ? 1 : 0);    AV_WL16(st->codecpar->extradata+10, 1);    AV_WL16(st->codecpar->extradata+12, 0);     avpriv_set_pts_info(st, 64, 1, par->sample_rate);     return 0;} static int ace_read_packet(AVFormatContext *s, AVPacket *pkt){    AVCodecParameters *par = s->streams[0]->codecpar;     return av_get_packet(s->pb, pkt, par->block_align);} const FFInputFormat ff_ace_demuxer = {    .p.name         = "ace",    .p.long_name    = NULL_IF_CONFIG_SMALL("tri-Ace Audio Container"),    .p.flags        = AVFMT_GENERIC_INDEX,    .read_probe     = ace_probe,    .read_header    = ace_read_header,    .read_packet    = ace_read_packet,};