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#------------------------------------------------------------------------------
# riff: file(1) magic for RIFF format
# See
#
# http://www.seanet.com/users/matts/riffmci/riffmci.htm
#
# AVI section extended by Patrik Rådman <patrik+file-magic@iki.fi>
#
0 string RIFF RIFF (little-endian) data
# RIFF Palette format
>8 string PAL \b, palette
>>16 leshort x \b, version %d
>>18 leshort x \b, %d entries
# 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
# Microsoft WAVE format (*.wav)
>8 string WAVE \b, WAVE audio
>>20 leshort 1 \b, Microsoft PCM
>>>34 leshort >0 \b, %d bit
>>20 leshort 2 \b, Microsoft ADPCM
>>20 leshort 6 \b, ITU G.711 A-law
>>20 leshort 7 \b, ITU G.711 mu-law
>>20 leshort 17 \b, IMA ADPCM
>>20 leshort 20 \b, ITU G.723 ADPCM (Yamaha)
>>20 leshort 49 \b, GSM 6.10
>>20 leshort 64 \b, ITU G.721 ADPCM
>>20 leshort 80 \b, MPEG
>>20 leshort 85 \b, MPEG Layer 3
>>22 leshort =1 \b, mono
>>22 leshort =2 \b, stereo
>>22 leshort >2 \b, %d channels
>>24 lelong >0 %d Hz
# Corel Draw Picture
>8 string CDRA \b, Corel Draw Picture
# AVI == Audio Video Interleave
>8 string AVI\040 \b, AVI
>>12 string LIST
>>>20 string hdrlavih
>>>>&36 lelong x \b, %lu x
>>>>&40 lelong x %lu,
>>>>&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 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) 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 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
#
# 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
# 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
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