[vorbis-dev] Xiph Magic

[J C Fitzgerald]

Hi Folks,

FWIW I figured out the /etc/magic file entries for both native and Ogg
wrappered Speex, Vorbis and FLAC (attached).  YMMV because the fields
aren't necessarily in fixed positions in the files, but it works fine
for me.  Feel free to include it in the Xiph archives or forward it to
the /etc/magic file maintainer once you're satisfied with it.

John

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#------------------------------------------------------------------------------
# xiph:  file(1) magic for Xiph multi-media files
#

#
# Ogg wrappered formats: Speex, Vorbis and FLAC.
#
0	string			OggS		Xiph Ogg 
>28	string		Speex\020\020\020	\bSpeex audio
>>68	lelong			=0		\b, narrowband
>>68	lelong			=1		\b, wideband
>>68	lelong			=2		\b, ultra-wideband
>>76	lelong			>0		\b, %d channel(s)
>>64	lelong			>0 		%d Hz
>28	string			\001vorbis	\bVorbis audio
>>39	byte			=1		\b, mono
>>39	byte			=2		\b, stereo
>>39	byte			=3		\b, 3 channels
>>39	byte			=4		\b, quad
>>39	byte			>4		\b, %d channels
>>40	lelong			>0 		%d Hz
>28	string			fLaC		\bFLAC audio
>>92	belong&0x0001f000	=12288		\b, 4 bit
>>92	belong&0x0001f000	=28672		\b, 8 bit
>>92	belong&0x0001f000	=61440		\b, 16 bit
>>92	beshort&0x000e		=0		\b, mono
>>92	beshort&0x000e		=2		\b, stereo
>>92	beshort&0x000e		=4		\b, 3 channels
>>92	beshort&0x000e		=6		\b, quad
>>92	beshort&0x000e		=8		\b, 5 channels
>>92	beshort&0x000e		=10		\b, 6 channels
>>92	beshort&0x000e		=12		\b, 7 channels
>>92	beshort&0x000e		=14		\b, 8 channels
>>90	belong&0x00fffff0	=705600		44100 Hz
>>90	belong&0x00fffff0	=512000 	32000 Hz
>>90	belong&0x00fffff0	=328000 	22050 Hz
>>90	belong&0x00fffff0	=256000 	16000 Hz
>>90	belong&0x00fffff0	=128000		8000 Hz

#
# Speex native format.
#
0	string		Speex\020\020\020	Native Speex audio
>40	lelong			=0		\b, narrowband
>40	lelong			=1		\b, wideband
>40	lelong			=2		\b, ultra-wideband
>48	lelong			>0		\b, %d channel(s)
>36	lelong			>0 		%d Hz

#
# Vorbis native format.
#
0	string			\001vorbis	Native Vorbis audio
>11	byte			=1		\b, mono
>11	byte			=2		\b, stereo
>11	byte			=3		\b, 3 channels
>11	byte			=4		\b, quad
>11	byte			>4		\b, %d channels
>12	lelong			>0 		%d Hz

#
# FLAC native format.
#
0	string			fLaC		Native FLAC audio
>18	belong&0x000001f0	=48		\b, 4 bit
>18	belong&0x000001f0	=112		\b, 8 bit
>18	belong&0x000001f0	=240		\b, 16 bit
>18	belong&0x00000e00	=0		\b, mono
>18	belong&0x00000e00	=512		\b, stereo
>18	belong&0x00000e00	=1024		\b, 3 channels
>18	belong&0x00000e00	=1536		\b, quad
>18	belong&0x00000e00	=2048		\b, 5 channels
>18	belong&0x00000e00	=2560		\b, 6 channels
>18	belong&0x00000e00	=3072		\b, 7 channels
>18	belong&0x00000e00	=3584		\b, 8 channels
>18	belong&0xfffff000	=180633600	44100 Hz
>18	belong&0xfffff000	=131072000	32000 Hz
>18	belong&0xfffff000	=90316800	22050 Hz
>18	belong&0xfffff000	=65536000	16000 Hz
>18	belong&0xfffff000	=32768000	8000 Hz