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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * AVR demuxer |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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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 | #include "internal.h" |
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| 25 | #include "pcm.h" |
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| 26 | |||
| 27 | static int avr_probe(AVProbeData *p) |
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| 28 | { |
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| 29 | if (AV_RL32(p->buf) == MKTAG('2', 'B', 'I', 'T')) |
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| 30 | return AVPROBE_SCORE_EXTENSION; |
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| 31 | return 0; |
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| 32 | } |
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| 33 | |||
| 34 | static int avr_read_header(AVFormatContext *s) |
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| 35 | { |
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| 36 | uint16_t chan, sign, bps; |
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| 37 | AVStream *st; |
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| 38 | |||
| 39 | st = avformat_new_stream(s, NULL); |
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| 40 | if (!st) |
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| 41 | return AVERROR(ENOMEM); |
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| 42 | |||
| 43 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 44 | |||
| 45 | avio_skip(s->pb, 4); // magic |
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| 46 | avio_skip(s->pb, 8); // sample_name |
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| 47 | |||
| 48 | chan = avio_rb16(s->pb); |
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| 49 | if (!chan) { |
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| 50 | st->codec->channels = 1; |
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| 51 | } else if (chan == 0xFFFFu) { |
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| 52 | st->codec->channels = 2; |
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| 53 | } else { |
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| 54 | avpriv_request_sample(s, "chan %d", chan); |
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| 55 | return AVERROR_PATCHWELCOME; |
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| 56 | } |
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| 57 | |||
| 58 | st->codec->bits_per_coded_sample = bps = avio_rb16(s->pb); |
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| 59 | |||
| 60 | sign = avio_rb16(s->pb); |
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| 61 | |||
| 62 | avio_skip(s->pb, 2); // loop |
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| 63 | avio_skip(s->pb, 2); // midi |
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| 64 | avio_skip(s->pb, 1); // replay speed |
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| 65 | |||
| 66 | st->codec->sample_rate = avio_rb24(s->pb); |
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| 67 | avio_skip(s->pb, 4 * 3); |
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| 68 | avio_skip(s->pb, 2 * 3); |
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| 69 | avio_skip(s->pb, 20); |
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| 70 | avio_skip(s->pb, 64); |
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| 71 | |||
| 72 | st->codec->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign); |
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| 73 | if (st->codec->codec_id == AV_CODEC_ID_NONE) { |
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| 74 | avpriv_request_sample(s, "Bps %d and sign %d", bps, sign); |
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| 75 | return AVERROR_PATCHWELCOME; |
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| 76 | } |
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| 77 | |||
| 78 | st->codec->block_align = bps * st->codec->channels / 8; |
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| 79 | |||
| 80 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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| 81 | return 0; |
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| 82 | } |
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| 83 | |||
| 84 | AVInputFormat ff_avr_demuxer = { |
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| 85 | .name = "avr", |
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| 86 | .long_name = NULL_IF_CONFIG_SMALL("AVR (Audio Visual Research)"), |
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| 87 | .read_probe = avr_probe, |
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| 88 | .read_header = avr_read_header, |
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| 89 | .read_packet = ff_pcm_read_packet, |
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| 90 | .read_seek = ff_pcm_read_seek, |
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| 91 | .extensions = "avr", |
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| 92 | .flags = AVFMT_GENERIC_INDEX, |
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| 93 | }; |