86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
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/*
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* Black ops audio demuxer
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* Copyright (c) 2013 Michael Niedermayer
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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 "libavcodec/internal.h"
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#include "avformat.h"
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#include "internal.h"
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static int probe(const AVProbeData *p)
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{
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if (p->buf_size < 2096)
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return 0;
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if ( AV_RL32(p->buf ) != 1
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|| AV_RL32(p->buf + 8) > 100000
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|| AV_RL32(p->buf + 12) > 8
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|| AV_RL32(p->buf + 16) != 2096
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||!AV_RL32(p->buf + 21)
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|| AV_RL16(p->buf + 25) != 2096
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|| AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21)
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)
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return 0;
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return AVPROBE_SCORE_EXTENSION;
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}
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static int read_header(AVFormatContext *s)
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{
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AVStream *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_ADPCM_MS;
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avio_rl32(s->pb);
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avio_rl32(s->pb);
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st->codecpar->sample_rate = avio_rl32(s->pb);
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st->codecpar->channels = avio_rl32(s->pb);
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if (st->codecpar->channels > FF_SANE_NB_CHANNELS)
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return AVERROR(ENOSYS);
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s->internal->data_offset = avio_rl32(s->pb);
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avio_r8(s->pb);
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st->codecpar->block_align = avio_rl32(s->pb);
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if (st->codecpar->block_align > INT_MAX / FF_SANE_NB_CHANNELS)
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return AVERROR_INVALIDDATA;
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st->codecpar->block_align *= st->codecpar->channels;
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avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
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return 0;
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}
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVStream *st = s->streams[0];
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return av_get_packet(s->pb, pkt, st->codecpar->block_align);
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}
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AVInputFormat ff_boa_demuxer = {
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.name = "boa",
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.long_name = NULL_IF_CONFIG_SMALL("Black Ops Audio"),
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.read_probe = probe,
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.read_header = read_header,
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.read_packet = read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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};
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