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