diff options
Diffstat (limited to 'libavformat/boadec.c')
-rw-r--r-- | libavformat/boadec.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/libavformat/boadec.c b/libavformat/boadec.c new file mode 100644 index 0000000..be003e5 --- /dev/null +++ b/libavformat/boadec.c @@ -0,0 +1,79 @@ +/* + * 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 "avformat.h" +#include "internal.h" + +static int probe(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->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = AV_CODEC_ID_ADPCM_MS; + + avio_rl32(s->pb); + avio_rl32(s->pb); + st->codec->sample_rate = avio_rl32(s->pb); + st->codec->channels = avio_rl32(s->pb); + s->internal->data_offset = avio_rl32(s->pb); + avio_r8(s->pb); + st->codec->block_align = st->codec->channels * avio_rl32(s->pb); + + 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->codec->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, +}; |