repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Black ops audio demuxer | |
| 3 | * Copyright (c) 2013 Michael Niedermayer | |
| 4 | * | |
| 5 | * This file is part of FFmpeg. | |
| 6 | * | |
| 7 | * FFmpeg is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU Lesser General Public | |
| 9 | * License as published by the Free Software Foundation; either | |
| 10 | * version 2.1 of the License, or (at your option) any later version. | |
| 11 | * | |
| 12 | * FFmpeg is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | * Lesser General Public License for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU Lesser General Public | |
| 18 | * License along with FFmpeg; if not, write to the Free Software | |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 20 | */ | |
| 21 | ||
| 22 | #include "libavutil/intreadwrite.h" | |
| 23 | #include "avformat.h" | |
| 24 | ||
| 25 | static int probe(AVProbeData *p) | |
| 26 | { | |
| 27 | if (p->buf_size < 2096) | |
| 28 | return 0; | |
| 29 | if ( AV_RL32(p->buf ) != 1 | |
| 30 | || AV_RL32(p->buf + 8) > 100000 | |
| 31 | || AV_RL32(p->buf + 12) > 8 | |
| 32 | || AV_RL32(p->buf + 16) != 2096 | |
| 33 | ||!AV_RL32(p->buf + 21) | |
| 34 | || AV_RL16(p->buf + 25) != 2096 | |
| 35 | || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21) | |
| 36 | ) | |
| 37 | return 0; | |
| 38 | return AVPROBE_SCORE_EXTENSION; | |
| 39 | } | |
| 40 | ||
| 41 | ||
| 42 | static int read_header(AVFormatContext *s) | |
| 43 | { | |
| 44 | AVStream *st = avformat_new_stream(s, NULL); | |
| 45 | if (!st) | |
| 46 | return AVERROR(ENOMEM); | |
| 47 | ||
| 48 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 49 | st->codec->codec_id = AV_CODEC_ID_ADPCM_MS; | |
| 50 | ||
| 51 | avio_rl32(s->pb); | |
| 52 | avio_rl32(s->pb); | |
| 53 | st->codec->sample_rate = avio_rl32(s->pb); | |
| 54 | st->codec->channels = avio_rl32(s->pb); | |
| 55 | s->data_offset = avio_rl32(s->pb); | |
| 56 | avio_r8(s->pb); | |
| 57 | st->codec->block_align = st->codec->channels * avio_rl32(s->pb); | |
| 58 | ||
| 59 | avio_seek(s->pb, s->data_offset, SEEK_SET); | |
| 60 | ||
| 61 | return 0; | |
| 62 | } | |
| 63 | ||
| 64 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 65 | { | |
| 66 | AVStream *st = s->streams[0]; | |
| 67 | ||
| 68 | return av_get_packet(s->pb, pkt, st->codec->block_align); | |
| 69 | } | |
| 70 | ||
| 71 | AVInputFormat ff_boa_demuxer = { | |
| 72 | .name = "boa", | |
| 73 | .long_name = NULL_IF_CONFIG_SMALL("Black Ops Audio"), | |
| 74 | .read_probe = probe, | |
| 75 | .read_header = read_header, | |
| 76 | .read_packet = read_packet, | |
| 77 | .flags = AVFMT_GENERIC_INDEX, | |
| 78 | }; |