
#------------------------------------------------------------------------------
# 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)      string/c        h264    X.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 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
