repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * AVR demuxer | |
| 3 | * Copyright (c) 2012 Paul B Mahol | |
| 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 | #include "internal.h" | |
| 25 | #include "pcm.h" | |
| 26 | ||
| 27 | static int avr_probe(AVProbeData *p) | |
| 28 | { | |
| 29 | if (AV_RL32(p->buf) != MKTAG('2', 'B', 'I', 'T')) | |
| 30 | return 0; | |
| 31 | ||
| 32 | if (!AV_RB16(p->buf+12) || AV_RB16(p->buf+12) > 256) // channels | |
| 33 | return AVPROBE_SCORE_EXTENSION/2; | |
| 34 | if (AV_RB16(p->buf+14) > 256) // bps | |
| 35 | return AVPROBE_SCORE_EXTENSION/2; | |
| 36 | ||
| 37 | return AVPROBE_SCORE_EXTENSION; | |
| 38 | } | |
| 39 | ||
| 40 | static int avr_read_header(AVFormatContext *s) | |
| 41 | { | |
| 42 | uint16_t chan, sign, bps; | |
| 43 | AVStream *st; | |
| 44 | ||
| 45 | st = avformat_new_stream(s, NULL); | |
| 46 | if (!st) | |
| 47 | return AVERROR(ENOMEM); | |
| 48 | ||
| 49 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 50 | ||
| 51 | avio_skip(s->pb, 4); // magic | |
| 52 | avio_skip(s->pb, 8); // sample_name | |
| 53 | ||
| 54 | chan = avio_rb16(s->pb); | |
| 55 | if (!chan) { | |
| 56 | st->codec->channels = 1; | |
| 57 | } else if (chan == 0xFFFFu) { | |
| 58 | st->codec->channels = 2; | |
| 59 | } else { | |
| 60 | avpriv_request_sample(s, "chan %d", chan); | |
| 61 | return AVERROR_PATCHWELCOME; | |
| 62 | } | |
| 63 | ||
| 64 | st->codec->bits_per_coded_sample = bps = avio_rb16(s->pb); | |
| 65 | ||
| 66 | sign = avio_rb16(s->pb); | |
| 67 | ||
| 68 | avio_skip(s->pb, 2); // loop | |
| 69 | avio_skip(s->pb, 2); // midi | |
| 70 | avio_skip(s->pb, 1); // replay speed | |
| 71 | ||
| 72 | st->codec->sample_rate = avio_rb24(s->pb); | |
| 73 | avio_skip(s->pb, 4 * 3); | |
| 74 | avio_skip(s->pb, 2 * 3); | |
| 75 | avio_skip(s->pb, 20); | |
| 76 | avio_skip(s->pb, 64); | |
| 77 | ||
| 78 | st->codec->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign); | |
| 79 | if (st->codec->codec_id == AV_CODEC_ID_NONE) { | |
| 80 | avpriv_request_sample(s, "Bps %d and sign %d", bps, sign); | |
| 81 | return AVERROR_PATCHWELCOME; | |
| 82 | } | |
| 83 | ||
| 84 | st->codec->block_align = bps * st->codec->channels / 8; | |
| 85 | ||
| 86 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
| 87 | return 0; | |
| 88 | } | |
| 89 | ||
| 90 | AVInputFormat ff_avr_demuxer = { | |
| 91 | .name = "avr", | |
| 92 | .long_name = NULL_IF_CONFIG_SMALL("AVR (Audio Visual Research)"), | |
| 93 | .read_probe = avr_probe, | |
| 94 | .read_header = avr_read_header, | |
| 95 | .read_packet = ff_pcm_read_packet, | |
| 96 | .read_seek = ff_pcm_read_seek, | |
| 97 | .extensions = "avr", | |
| 98 | .flags = AVFMT_GENERIC_INDEX, | |
| 99 | }; |