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| /* | |
| * 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 | |
| */ | |
| 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 AVInputFormat ff_ace_demuxer = { | |
| .name = "ace", | |
| .long_name = NULL_IF_CONFIG_SMALL("tri-Ace Audio Container"), | |
| .read_probe = ace_probe, | |
| .read_header = ace_read_header, | |
| .read_packet = ace_read_packet, | |
| .flags = AVFMT_GENERIC_INDEX, | |
| }; | |