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78 lines
2.3 KiB
78 lines
2.3 KiB
/* |
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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 "avformat.h" |
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static int probe(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->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->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->codec->sample_rate = avio_rl32(s->pb); |
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st->codec->channels = avio_rl32(s->pb); |
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s->data_offset = avio_rl32(s->pb); |
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avio_r8(s->pb); |
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st->codec->block_align = st->codec->channels * avio_rl32(s->pb); |
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avio_seek(s->pb, s->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->codec->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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