#------------------------------------------------------------------------------
# $File: riff,v 1.34 2019/04/19 00:42:27 christos Exp $
# riff: file(1) magic for RIFF format
# See
#
# https://www.seanet.com/users/matts/riffmci/riffmci.htm
# http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/Docs/riffmci.pdf
#
# audio format tag. Assume limits: max 1024 bit, 128 channels, 1 MHz
0 name riff-wave
>0 leshort 1 \b, Microsoft PCM
>>14 leshort >0
>>>14 leshort <1024 \b, %d bit
>0 leshort 2 \b, Microsoft ADPCM
>0 leshort 6 \b, ITU G.711 A-law
>0 leshort 7 \b, ITU G.711 mu-law
>0 leshort 8 \b, Microsoft DTS
>0 leshort 17 \b, IMA ADPCM
>0 leshort 20 \b, ITU G.723 ADPCM (Yamaha)
>0 leshort 49 \b, GSM 6.10
>0 leshort 64 \b, ITU G.721 ADPCM
>0 leshort 80 \b, MPEG
>0 leshort 85 \b, MPEG Layer 3
>0 leshort 0x2001 \b, DTS
>2 leshort =1 \b, mono
>2 leshort =2 \b, stereo
>2 leshort >2
>>2 leshort <128 \b, %d channels
>4 lelong >0
>>4 lelong <1000000 %d Hz
# try to find "fmt "
0 name riff-walk
>0 string fmt\x20
>>4 lelong <0x80
>>>8 use riff-wave
>0 string LIST
>>&(4.l+4) use riff-walk
>0 string DISP
>>&(4.l+4) use riff-walk
>0 string bext
>>&(4.l+4) use riff-walk
>0 string Fake
>>&(4.l+4) use riff-walk
>0 string fact
>>&(4.l+4) use riff-walk
>0 string VP8
>>11 byte 0x9d
>>>12 byte 0x01
>>>>13 byte 0x2a \b, VP8 encoding
>>>>>14 leshort&0x3fff x \b, %d
>>>>>16 leshort&0x3fff x \bx%d, Scaling:
>>>>>14 leshort&0xc000 0x0000 \b [none]
>>>>>14 leshort&0xc000 0x1000 \b [5/4]
>>>>>14 leshort&0xc000 0x2000 \b [5/3]
>>>>>14 leshort&0xc000 0x3000 \b [2]
>>>>>14 leshort&0xc000 0x0000 \bx[none]
>>>>>14 leshort&0xc000 0x1000 \bx[5/4]
>>>>>14 leshort&0xc000 0x2000 \bx[5/3]
>>>>>14 leshort&0xc000 0x3000 \bx[2]
>>>>>15 byte&0x80 =0x00 \b, YUV color
>>>>>15 byte&0x80 =0x80 \b, bad color specification
>>>>>15 byte&0x40 =0x40 \b, no clamping required
>>>>>15 byte&0x40 =0x00 \b, decoders should clamp
#>0 string x we got %s
#>>&(4.l+4) use riff-walk
# AVI section extended by Patrik Radman <patrik+file-magic@iki.fi>
#
0 string RIFF RIFF (little-endian) data
# RIFF Palette format
# Update: Joerg Jenderek
# URL: https://en.wikipedia.org/wiki/Resource_Interchange_File_Format
# Reference: https://worms2d.info/Palette_file
>8 string PAL\ \b, palette
!:mime application/x-riff
# color palette by Microsoft Corporation
!:ext pal
# file size = chunk size + 8 in most cases
>>4 ulelong+8 x \b, %u bytes
# Extended PAL Format
>>12 string plth \b, extended
# Simple PAL Format
>>12 string data
# data chunk size = color entries * 4 + 4 + sometimes extra (4) appended bytes
>>>16 ulelong x \b, data size %u
# palVersion is always 0x0300
#>>>20 leshort x \b, version 0x%4.4x
# palNumEntries specifies the number of palette color entries
>>>22 uleshort x \b, %u entries
# after palPalEntry sized (number of color entries * 4 ) vector
>>>(22.s*4) ubequad x
# jump relative 22 ( 8 + 16) bytes forward points after end of file or to
# appended extra bytes like in http://safecolours.rigdenage.com/set(ms).zip/Protan(MS).pal
>>>>&16 ubelong x \b, extra bytes
>>>>>&-4 ubelong >0 0x%8.8x
# RIFF Device Independent Bitmap format
>8 string RDIB \b, device-independent bitmap
>>16 string BM
>>>30 leshort 12 \b, OS/2 1.x format
>>>>34 leshort x \b, %d x
>>>>36 leshort x %d
>>>30 leshort 64 \b, OS/2 2.x format
>>>>34 leshort x \b, %d x
>>>>36 leshort x %d
>>>30 leshort 40 \b, Windows 3.x format
>>>>34 lelong x \b, %d x
>>>>38 lelong x %d x
>>>>44 leshort x %d
# RIFF MIDI format
>8 string RMID \b, MIDI
# RIFF Multimedia Movie File format
>8 string RMMP \b, multimedia movie
# RIFF wrapper for MP3
>8 string RMP3 \b, MPEG Layer 3 audio
# Microsoft WAVE format (*.wav)
>8 string WAVE \b, WAVE audio
!:mime audio/x-wav
>>12 string >\0
>>>12 use riff-walk
# Corel Draw Picture
>8 string CDRA \b, Corel Draw Picture
!:mime image/x-coreldraw
>8 string CDR6 \b, Corel Draw Picture, version 6
!:mime image/x-coreldraw
>8 string NUNDROOT \b, Steinberg CuBase
# AVI == Audio Video Interleave
>8 string AVI\040 \b, AVI
!:mime video/x-msvideo
>>12 string LIST
>>>20 string hdrlavih
>>>>&36 lelong x \b, %u x
>>>>&40 lelong x %u,
>>>>&4 lelong >1000000 <1 fps,
>>>>&4 lelong 1000000 1.00 fps,
>>>>&4 lelong 500000 2.00 fps,
>>>>&4 lelong 333333 3.00 fps,
>>>>&4 lelong 250000 4.00 fps,
>>>>&4 lelong 200000 5.00 fps,
>>>>&4 lelong 166667 6.00 fps,
>>>>&4 lelong 142857 7.00 fps,
>>>>&4 lelong 125000 8.00 fps,
>>>>&4 lelong 111111 9.00 fps,
>>>>&4 lelong 100000 10.00 fps,
# ]9.9,10.1[
>>>>&4 lelong <101010
>>>>>&-4 lelong >99010
>>>>>>&-4 lelong !100000 ~10 fps,
>>>>&4 lelong 83333 12.00 fps,
# ]11.9,12.1[
>>>>&4 lelong <84034
>>>>>&-4 lelong >82645
>>>>>>&-4 lelong !83333 ~12 fps,
>>>>&4 lelong 66667 15.00 fps,
# ]14.9,15.1[
>>>>&4 lelong <67114
>>>>>&-4 lelong >66225
>>>>>>&-4 lelong !66667 ~15 fps,
>>>>&4 lelong 50000 20.00 fps,
>>>>&4 lelong 41708 23.98 fps,
>>>>&4 lelong 41667 24.00 fps,
# ]23.9,24.1[
>>>>&4 lelong <41841
>>>>>&-4 lelong >41494
>>>>>>&-4 lelong !41708
>>>>>>>&-4 lelong !41667 ~24 fps,
>>>>&4 lelong 40000 25.00 fps,
# ]24.9,25.1[
>>>>&4 lelong <40161
>>>>>&-4 lelong >39841
>>>>>>&-4 lelong !40000 ~25 fps,
>>>>&4 lelong 33367 29.97 fps,
>>>>&4 lelong 33333 30.00 fps,
# ]29.9,30.1[
>>>>&4 lelong <33445
>>>>>&-4 lelong >33223
>>>>>>&-4 lelong !33367
>>>>>>>&-4 lelong !33333 ~30 fps,
>>>>&4 lelong <32224 >30 fps,
##>>>>&4 lelong x (%lu)
##>>>>&20 lelong x %lu frames,
# Note: The tests below assume that the AVI has 1 or 2 streams,
# "vids" optionally followed by "auds".
# (Should cover 99.9% of all AVIs.)
# assuming avih length = 56
>>>88 string LIST
>>>>96 string strlstrh
>>>>>108 string vids video:
>>>>>>&0 lelong 0 uncompressed
# skip past vids strh
>>>>>>(104.l+108) string strf
>>>>>>>(104.l+132) lelong 1 RLE 8bpp
>>>>>>>(104.l+132) string/c cvid Cinepak
>>>>>>>(104.l+132) string/c i263 Intel I.263
>>>>>>>(104.l+132) string/c iv32 Indeo 3.2
>>>>>>>(104.l+132) string/c iv41 Indeo 4.1
>>>>>>>(104.l+132) string/c iv50 Indeo 5.0
>>>>>>>(104.l+132) string/c mp42 Microsoft MPEG-4 v2
>>>>>>>(104.l+132) string/c mp43 Microsoft MPEG-4 v3
>>>>>>>(104.l+132) string/c fmp4 FFMpeg MPEG-4
>>>>>>>(104.l+132) string/c mjpg Motion JPEG
>>>>>>>(104.l+132) string/c div3 DivX 3
>>>>>>>>112 string/c div3 Low-Motion
>>>>>>>>112 string/c div4 Fast-Motion
>>>>>>>(104.l+132) string/c divx DivX 4
>>>>>>>(104.l+132) string/c dx50 DivX 5
>>>>>>>(104.l+132) string/c xvid XviD
>>>>>>>(104.l+132) string/c h264 H.264
>>>>>>>(104.l+132) string/c wmv3 Windows Media Video 9
>>>>>>>(104.l+132) string/c h264 X.264 or H.264
>>>>>>>(104.l+132) lelong 0
##>>>>>>>(104.l+132) string x (%.4s)
# skip past first (video) LIST
>>>>(92.l+96) string LIST
>>>>>(92.l+104) string strlstrh
>>>>>>(92.l+116) string auds \b, audio:
# auds strh length = 56:
>>>>>>>(92.l+172) string strf
>>>>>>>>(92.l+180) leshort 0x0001 uncompressed PCM
>>>>>>>>(92.l+180) leshort 0x0002 ADPCM
>>>>>>>>(92.l+180) leshort 0x0006 aLaw
>>>>>>>>(92.l+180) leshort 0x0007 uLaw
>>>>>>>>(92.l+180) leshort 0x0050 MPEG-1 Layer 1 or 2
>>>>>>>>(92.l+180) leshort 0x0055 MPEG-1 Layer 3
>>>>>>>>(92.l+180) leshort 0x2000 Dolby AC3
>>>>>>>>(92.l+180) leshort 0x0161 DivX
##>>>>>>>>(92.l+180) leshort x (0x%.4x)
>>>>>>>>(92.l+182) leshort 1 (mono,
>>>>>>>>(92.l+182) leshort 2 (stereo,
>>>>>>>>(92.l+182) leshort >2 (%d channels,
>>>>>>>>(92.l+184) lelong x %d Hz)
# auds strh length = 64:
>>>>>>>(92.l+180) string strf
>>>>>>>>(92.l+188) leshort 0x0001 uncompressed PCM
>>>>>>>>(92.l+188) leshort 0x0002 ADPCM
>>>>>>>>(92.l+188) leshort 0x0055 MPEG-1 Layer 3
>>>>>>>>(92.l+188) leshort 0x2000 Dolby AC3
>>>>>>>>(92.l+188) leshort 0x0161 DivX
##>>>>>>>>(92.l+188) leshort x (0x%.4x)
>>>>>>>>(92.l+190) leshort 1 (mono,
>>>>>>>>(92.l+190) leshort 2 (stereo,
>>>>>>>>(92.l+190) leshort >2 (%d channels,
>>>>>>>>(92.l+192) lelong x %d Hz)
# Animated Cursor format
>8 string ACON \b, animated cursor
# SoundFont 2 <mpruett@sgi.com>
>8 string sfbk SoundFont/Bank
# MPEG-1 wrapped in a RIFF, apparently
>8 string CDXA \b, wrapped MPEG-1 (CDXA)
>8 string 4XMV \b, 4X Movie file
# AMV-type AVI file: https://wiki.multimedia.cx/index.php?title=AMV
>8 string AMV\040 \b, AMV
>8 string WEBP \b, Web/P image
!:mime image/webp
>>12 use riff-walk
#
# XXX - some of the below may only appear in little-endian form.
#
# Also "MV93" appears to be for one form of Macromedia Director
# files, and "GDMF" appears to be another multimedia format.
#
0 string RIFX RIFF (big-endian) data
# RIFF Palette format
>8 string PAL \b, palette
>>16 beshort x \b, version %d
>>18 beshort x \b, %d entries
# RIFF Device Independent Bitmap format
>8 string RDIB \b, device-independent bitmap
>>16 string BM
>>>30 beshort 12 \b, OS/2 1.x format
>>>>34 beshort x \b, %d x
>>>>36 beshort x %d
>>>30 beshort 64 \b, OS/2 2.x format
>>>>34 beshort x \b, %d x
>>>>36 beshort x %d
>>>30 beshort 40 \b, Windows 3.x format
>>>>34 belong x \b, %d x
>>>>38 belong x %d x
>>>>44 beshort x %d
# RIFF MIDI format
>8 string RMID \b, MIDI
# RIFF Multimedia Movie File format
>8 string RMMP \b, multimedia movie
# Microsoft WAVE format (*.wav)
>8 string WAVE \b, WAVE audio
>>20 leshort 1 \b, Microsoft PCM
>>>34 leshort >0 \b, %d bit
>>22 beshort =1 \b, mono
>>22 beshort =2 \b, stereo
>>22 beshort >2 \b, %d channels
>>24 belong >0 %d Hz
# Corel Draw Picture
>8 string CDRA \b, Corel Draw Picture
>8 string CDR6 \b, Corel Draw Picture, version 6
# AVI == Audio Video Interleave
>8 string AVI\040 \b, AVI
# Animated Cursor format
>8 string ACON \b, animated cursor
# Notation Interchange File Format (big-endian only)
>8 string NIFF \b, Notation Interchange File Format
# SoundFont 2 <mpruett@sgi.com>
>8 string sfbk SoundFont/Bank
#------------------------------------------------------------------------------
# Sony Wave64
# see http://www.vcs.de/fileadmin/user_upload/MBS/PDF/Whitepaper/Informations_about_Sony_Wave64.pdf
# 128 bit RIFF-GUID { 66666972-912E-11CF-A5D6-28DB04C10000 } in little-endian
0 string riff\x2E\x91\xCF\x11\xA5\xD6\x28\xDB\x04\xC1\x00\x00 Sony Wave64 RIFF data
# 128 bit + total file size (64 bits) so 24 bytes
# then WAVE-GUID { 65766177-ACF3-11D3-8CD1-00C04F8EDB8A }
>24 string wave\xF3\xAC\xD3\x11\x8C\xD1\x00\xC0\x4F\x8E\xDB\x8A \b, WAVE 64 audio
!:mime audio/x-w64
# FMT-GUID { 20746D66-ACF3-11D3-8CD1-00C04F8EDB8A }
>>40 search/256 fmt\x20\xF3\xAC\xD3\x11\x8C\xD1\x00\xC0\x4F\x8E\xDB\x8A \b
>>>&10 leshort =1 \b, mono
>>>&10 leshort =2 \b, stereo
>>>&10 leshort >2 \b, %d channels
>>>&12 lelong >0 %d Hz
#------------------------------------------------------------------------------
# MBWF/RF64
# see EBU TECH 3306 https://tech.ebu.ch/docs/tech/tech3306-2009.pdf
0 string RF64\xff\xff\xff\xffWAVEds64 MBWF/RF64 audio
!:mime audio/x-wav
>40 search/256 fmt\x20 \b
>>&6 leshort =1 \b, mono
>>&6 leshort =2 \b, stereo
>>&6 leshort >2 \b, %d channels
>>&8 lelong >0 %d Hz