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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Black ops audio demuxer |
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| 3 | * Copyright (c) 2013 Michael Niedermayer |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/intreadwrite.h" |
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| 23 | #include "avformat.h" |
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| 24 | |||
| 25 | static int probe(AVProbeData *p) |
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| 26 | { |
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| 27 | if (p->buf_size < 2096) |
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| 28 | return 0; |
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| 29 | if ( AV_RL32(p->buf ) != 1 |
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| 30 | || AV_RL32(p->buf + 8) > 100000 |
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| 31 | || AV_RL32(p->buf + 12) > 8 |
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| 32 | || AV_RL32(p->buf + 16) != 2096 |
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| 33 | ||!AV_RL32(p->buf + 21) |
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| 34 | || AV_RL16(p->buf + 25) != 2096 |
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| 35 | || AV_RL32(p->buf + 48) % AV_RL32(p->buf + 21) |
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| 36 | ) |
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| 37 | return 0; |
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| 38 | return AVPROBE_SCORE_EXTENSION; |
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| 39 | } |
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| 40 | |||
| 41 | |||
| 42 | static int read_header(AVFormatContext *s) |
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| 43 | { |
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| 44 | AVStream *st = avformat_new_stream(s, NULL); |
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| 45 | if (!st) |
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| 46 | return AVERROR(ENOMEM); |
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| 47 | |||
| 48 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 49 | st->codec->codec_id = AV_CODEC_ID_ADPCM_MS; |
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| 50 | |||
| 51 | avio_rl32(s->pb); |
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| 52 | avio_rl32(s->pb); |
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| 53 | st->codec->sample_rate = avio_rl32(s->pb); |
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| 54 | st->codec->channels = avio_rl32(s->pb); |
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| 55 | s->data_offset = avio_rl32(s->pb); |
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| 56 | avio_r8(s->pb); |
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| 57 | st->codec->block_align = st->codec->channels * avio_rl32(s->pb); |
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| 58 | |||
| 59 | avio_seek(s->pb, s->data_offset, SEEK_SET); |
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| 60 | |||
| 61 | return 0; |
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| 62 | } |
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| 63 | |||
| 64 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 65 | { |
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| 66 | AVStream *st = s->streams[0]; |
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| 67 | |||
| 68 | return av_get_packet(s->pb, pkt, st->codec->block_align); |
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| 69 | } |
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| 70 | |||
| 71 | AVInputFormat ff_boa_demuxer = { |
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| 72 | .name = "boa", |
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| 73 | .long_name = NULL_IF_CONFIG_SMALL("Black Ops Audio"), |
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| 74 | .read_probe = probe, |
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| 75 | .read_header = read_header, |
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| 76 | .read_packet = read_packet, |
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| 77 | .flags = AVFMT_GENERIC_INDEX, |
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| 78 | }; |