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# $OpenBSD: audio,v 1.8 2005/09/06 21:05:55 fgsch Exp $
#------------------------------------------------------------------------------
# audio: file(1) magic for sound formats (see also "iff")
#
# Jan Nicolai Langfeldt (janl@ifi.uio.no), Dan Quinlan (quinlan@yggdrasil.com),
# and others
#
# Sun/NeXT audio data
0 string .snd Sun/NeXT audio data:
>12 belong 1 8-bit ISDN u-law,
>12 belong 2 8-bit linear PCM [REF-PCM],
>12 belong 3 16-bit linear PCM,
>12 belong 4 24-bit linear PCM,
>12 belong 5 32-bit linear PCM,
>12 belong 6 32-bit IEEE floating point,
>12 belong 7 64-bit IEEE floating point,
>12 belong 23 8-bit ISDN u-law compressed (CCITT G.721 ADPCM voice data encoding),
>12 belong 24 compressed (8-bit G.722 ADPCM)
>12 belong 25 compressed (3-bit G.723 ADPCM),
>12 belong 26 compressed (5-bit G.723 ADPCM),
>12 belong 27 8-bit A-law,
>20 belong 1 mono,
>20 belong 2 stereo,
>20 belong 4 quad,
>16 belong >0 %d Hz
# DEC systems (e.g. DECstation 5000) use a variant of the Sun/NeXT format
# that uses little-endian encoding and has a different magic number
0 lelong 0x0064732E DEC audio data:
>12 lelong 1 8-bit ISDN u-law,
>12 lelong 2 8-bit linear PCM [REF-PCM],
>12 lelong 3 16-bit linear PCM,
>12 lelong 4 24-bit linear PCM,
>12 lelong 5 32-bit linear PCM,
>12 lelong 6 32-bit IEEE floating point,
>12 lelong 7 64-bit IEEE floating point,
>12 lelong 23 8-bit ISDN u-law compressed (CCITT G.721 ADPCM voice data encoding),
>20 lelong 1 mono,
>20 lelong 2 stereo,
>20 lelong 4 quad,
>16 lelong >0 %d Hz
# Creative Labs AUDIO stuff
0 string MThd Standard MIDI data
>9 byte >0 (format %d)
>11 byte >1 using %d channels
0 string CTMF Creative Music (CMF) data
0 string SBI SoundBlaster instrument data
0 string Creative\ Voice\ File Creative Labs voice data
# is this next line right? it came this way...
>19 byte 0x1A
>23 byte >0 - version %d
>22 byte >0 \b.%d
# first entry is also the string "NTRK"
0 belong 0x4e54524b MultiTrack sound data
>4 belong x - version %ld
# Microsoft WAVE format (*.wav)
0 string RIFF Microsoft RIFF
>8 string WAVE \b, WAVE audio data
>>34 leshort >0 \b, %d bit
>>22 leshort =1 \b, mono
>>22 leshort =2 \b, stereo
>>22 leshort >2 \b, %d channels
>>24 lelong >0 %d Hz
# AVI == Audio Video Interleave
>8 string AVI\ \b, AVI data
# Extended MOD format (*.emd) (Greg Roelofs, newt@uchicago.edu); NOT TESTED
# [based on posting 940824 by "Dirk/Elastik", husberg@lehtori.cc.tut.fi]
0 string EMOD Extended MOD sound data,
>4 byte&0xf0 x version %d
>4 byte&0x0f x \b.%d,
>45 byte x %d instruments
>83 byte 0 (module)
>83 byte 1 (song)
# Real Audio (Magic .ra\0375)
0 belong 0x2e7261fd realaudio sound file
# MTM/669/FAR/S3M/ULT/XM format checking [Aaron Eppert, aeppert@dialin.ind.net]
# Oct 31, 1995
#0 string MTM MultiTracker Module sound file
#0 string if Composer 669 Module sound data
#0 string FAR Module sound data
#0 string MAS_U ULT(imate) Module sound data
#0x2c string SCRM ScreamTracker III Module sound data
#0 string Extended Module Extended Module sound data
#------------------------
# MPEG: file(1) magic for MPEG audio.
#
# From <ckane@best.com>
# Show MPEG level, layer, kbit/s, hz, stereo/mono for an MPG audio file.
# This section is lengthy because the kbit/s rate depends on the
# level and layer, and file(1) doesn't allow math on the values.
#
####### MPEG begins with three hex 'f' nibbles.
0 beshort&0xfff0 0xfff0 MPEG
####### Level 2
>1 byte&0x08 0x00 2.0
>>1 byte&0x06 0x00 Layer Unknown,
####### Level 2, Layers I, II, and III
>>1 byte&0x06 0x02 Layer III,
>>>2 byte&0xf0 0x00 0 kbit/s,
>>>2 byte&0xf0 0x10 8 kbit/s,
>>>2 byte&0xf0 0x20 16 kbit/s,
>>>2 byte&0xf0 0x30 24 kbit/s,
>>>2 byte&0xf0 0x40 32 kbit/s,
>>>2 byte&0xf0 0x50 40 kbit/s,
>>>2 byte&0xf0 0x60 48 kbit/s,
>>>2 byte&0xf0 0x70 56 kbit/s,
>>>2 byte&0xf0 0x80 64 kbit/s,
>>>2 byte&0xf0 0x90 80 kbit/s,
>>>2 byte&0xf0 0xa0 96 kbit/s,
>>>2 byte&0xf0 0xb0 112 kbit/s,
>>>2 byte&0xf0 0xc0 128 kbit/s,
>>>2 byte&0xf0 0xd0 144 kbit/s,
>>>2 byte&0xf0 0xe0 160 kbit/s,
>>>2 byte&0xf0 0xf0 ? kbit/s,
>>1 byte&0x06 0x04 Layer II,
>>>2 byte&0xf0 0x00 0 kbit/s,
>>>2 byte&0xf0 0x10 8 kbit/s,
>>>2 byte&0xf0 0x20 16 kbit/s,
>>>2 byte&0xf0 0x30 24 kbit/s,
>>>2 byte&0xf0 0x40 32 kbit/s,
>>>2 byte&0xf0 0x50 40 kbit/s,
>>>2 byte&0xf0 0x60 48 kbit/s,
>>>2 byte&0xf0 0x70 56 kbit/s,
>>>2 byte&0xf0 0x80 64 kbit/s,
>>>2 byte&0xf0 0x90 80 kbit/s,
>>>2 byte&0xf0 0xa0 96 kbit/s,
>>>2 byte&0xf0 0xb0 112 kbit/s,
>>>2 byte&0xf0 0xc0 128 kbit/s,
>>>2 byte&0xf0 0xd0 144 kbit/s,
>>>2 byte&0xf0 0xe0 160 kbit/s,
>>>2 byte&0xf0 0xf0 ? kbit/s,
>>1 byte&0x06 0x06 Layer I,
>>>2 byte&0xf0 0x00 0 kbit/s,
>>>2 byte&0xf0 0x10 32 kbit/s,
>>>2 byte&0xf0 0x20 48 kbit/s,
>>>2 byte&0xf0 0x30 56 kbit/s,
>>>2 byte&0xf0 0x40 64 kbit/s,
>>>2 byte&0xf0 0x50 80 kbit/s,
>>>2 byte&0xf0 0x60 96 kbit/s,
>>>2 byte&0xf0 0x70 112 kbit/s,
>>>2 byte&0xf0 0x80 128 kbit/s,
>>>2 byte&0xf0 0x90 144 kbit/s,
>>>2 byte&0xf0 0xa0 160 kbit/s,
>>>2 byte&0xf0 0xb0 176 kbit/s,
>>>2 byte&0xf0 0xc0 192 kbit/s,
>>>2 byte&0xf0 0xd0 224 kbit/s,
>>>2 byte&0xf0 0xe0 256 kbit/s,
>>>2 byte&0xf0 0xf0 ? kbit/s,
####### Level 2, Hz
>>2 byte&0x0c 0x00 22050 Hz
>>2 byte&0x0c 0x04 24000 Hz
>>2 byte&0x0c 0x08 16000 Hz
>>2 byte&0x0c 0x0c ? Hz
####### Level 1 decoding
>1 byte&0x08 0x08 1.0
>>1 byte&0x06 0x00 Layer Unknown.
####### Level 1, Layers I, II, and III
>>1 byte&0x06 0x02 Layer III,
>>>2 byte&0xf0 0x00 0 kbit/s,
>>>2 byte&0xf0 0x10 32 kbit/s,
>>>2 byte&0xf0 0x20 40 kbit/s,
>>>2 byte&0xf0 0x30 48 kbit/s,
>>>2 byte&0xf0 0x40 56 kbit/s,
>>>2 byte&0xf0 0x50 64 kbit/s,
>>>2 byte&0xf0 0x60 80 kbit/s,
>>>2 byte&0xf0 0x70 96 kbit/s,
>>>2 byte&0xf0 0x80 112 kbit/s,
>>>2 byte&0xf0 0x90 128 kbit/s,
>>>2 byte&0xf0 0xa0 160 kbit/s,
>>>2 byte&0xf0 0xb0 192 kbit/s,
>>>2 byte&0xf0 0xc0 224 kbit/s,
>>>2 byte&0xf0 0xd0 256 kbit/s,
>>>2 byte&0xf0 0xe0 320 kbit/s,
>>>2 byte&0xf0 0xf0 ? kbit/s,
>>1 byte&0x06 0x04 Layer II,
>>>2 byte&0xf0 0x00 0 kbit/s,
>>>2 byte&0xf0 0x10 32 kbit/s,
>>>2 byte&0xf0 0x20 48 kbit/s,
>>>2 byte&0xf0 0x30 56 kbit/s,
>>>2 byte&0xf0 0x40 64 kbit/s,
>>>2 byte&0xf0 0x50 80 kbit/s,
>>>2 byte&0xf0 0x60 96 kbit/s,
>>>2 byte&0xf0 0x70 112 kbit/s,
>>>2 byte&0xf0 0x80 128 kbit/s,
>>>2 byte&0xf0 0x90 160 kbit/s,
>>>2 byte&0xf0 0xa0 192 kbit/s,
>>>2 byte&0xf0 0xb0 224 kbit/s,
>>>2 byte&0xf0 0xc0 256 kbit/s,
>>>2 byte&0xf0 0xd0 320 kbit/s,
>>>2 byte&0xf0 0xe0 384 kbit/s,
>>>2 byte&0xf0 0xf0 ? kbit/s,
>>1 byte&0x06 0x06 Layer I,
>>>2 byte&0xf0 0x00 0 kbit/s,
>>>2 byte&0xf0 0x10 32 kbit/s,
>>>2 byte&0xf0 0x20 64 kbit/s,
>>>2 byte&0xf0 0x30 96 kbit/s,
>>>2 byte&0xf0 0x40 128 kbit/s,
>>>2 byte&0xf0 0x50 160 kbit/s,
>>>2 byte&0xf0 0x60 192 kbit/s,
>>>2 byte&0xf0 0x70 224 kbit/s,
>>>2 byte&0xf0 0x80 256 kbit/s,
>>>2 byte&0xf0 0x90 288 kbit/s,
>>>2 byte&0xf0 0xa0 320 kbit/s,
>>>2 byte&0xf0 0xb0 352 kbit/s,
>>>2 byte&0xf0 0xc0 384 kbit/s,
>>>2 byte&0xf0 0xd0 416 kbit/s,
>>>2 byte&0xf0 0xe0 448 kbit/s,
>>>2 byte&0xf0 0xf0 ? kbit/s,
####### Level 2, Hz
>>2 byte&0x0c 0x00 44100 Hz
>>2 byte&0x0c 0x04 48000 Hz
>>2 byte&0x0c 0x08 32000 Hz
>>2 byte&0x0c 0x0c ? Hz
####### Stereo or Mono
>3 byte&0xc0 0x00 stereo
>3 byte&0xc0 0x40 joint-stereo
>3 byte&0xc0 0x80 dual-channel
>3 byte&0xc0 0xc0 mono
# Free lossless audio codec <http://flac.sourceforge.net>
# From: Przemyslaw Augustyniak <silvathraec@rpg.pl>
0 string fLaC FLAC audio bitstream data
>4 byte&0x7f >0 \b, unknown version
>4 byte&0x7f 0 \b
# some common bits/sample values
>>20 beshort&0x1f0 0x030 \b, 4 bit
>>20 beshort&0x1f0 0x050 \b, 6 bit
>>20 beshort&0x1f0 0x070 \b, 8 bit
>>20 beshort&0x1f0 0x0b0 \b, 12 bit
>>20 beshort&0x1f0 0x0f0 \b, 16 bit
>>20 beshort&0x1f0 0x170 \b, 24 bit
>>20 byte&0xe 0x0 \b, mono
>>20 byte&0xe 0x2 \b, stereo
>>20 byte&0xe 0x4 \b, 3 channels
>>20 byte&0xe 0x6 \b, 4 channels
>>20 byte&0xe 0x8 \b, 5 channels
>>20 byte&0xe 0xa \b, 6 channels
>>20 byte&0xe 0xc \b, 7 channels
>>20 byte&0xe 0xe \b, 8 channels
# some common sample rates
>>17 belong&0xfffff0 0x0ac440 \b, 44.1 kHz
>>17 belong&0xfffff0 0x0bb800 \b, 48 kHz
>>17 belong&0xfffff0 0x07d000 \b, 32 kHz
>>17 belong&0xfffff0 0x056220 \b, 22.05 kHz
>>17 belong&0xfffff0 0x05dc00 \b, 24 kHz
>>17 belong&0xfffff0 0x03e800 \b, 16 kHz
>>17 belong&0xfffff0 0x02b110 \b, 11.025 kHz
>>17 belong&0xfffff0 0x02ee00 \b, 12 kHz
>>17 belong&0xfffff0 0x01f400 \b, 8 kHz
>>17 belong&0xfffff0 0x177000 \b, 96 kHz
>>17 belong&0xfffff0 0x0fa000 \b, 64 kHz
>>21 byte&0xf >0 \b, >4G samples
>>21 byte&0xf 0 \b
>>>22 belong >0 \b, %u samples
>>>22 belong 0 \b, length unknown
|
