Re: [linux-audio-user] Funky wav file format 674f

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Subject: Re: [linux-audio-user] Funky wav file format 674f
From: Erik de Castro Lopo (erikd-lad_AT_mega-nerd.com)
Date: Sun Oct 12 2003 - 23:59:54 EEST

On Sun, 12 Oct 2003 02:48:20 -0500
"Pete Bessman" <ninjadroid_AT_ml1.net> wrote:

> So I got a bunch of samples lying around from my FruityLoops days, and I
> want to make use of 'em. The catch is, they're not standard PCM encoded
> WAV files. While they are waves, they use format '674f', and I can't
> figure out exactly what it is. XMMS can play it, sox doesn't know what
> to do with it, and I've grepped the crap out of libsndfile and
> libaudiofile and haven't found reference to it. Anybody know anything
> about this? I'm about to go through the XMMS sources, so my post here
> might be premature, but any and all leads will be appreciated.

I asked for a copy of this file in a private email to Peter. Turns out this
is VERY interesting. Here is the hexdump:

00000000: 52 49 46 46 8C 10 00 00 57 41 56 45 66 6D 74 20 RIFF.... WAVEfmt
00000010: 1A 00 00 00 4F 67 01 00 44 AC 00 00 F8 2A 00 00 ....Og.. D....*..
00000020: 01 00 10 00 08 00 01 02 02 20 31 12 01 20 66 61 ........ . 1.. fa
00000030: 63 74 04 00 00 00 1F 05 00 00 64 61 74 61 52 10 ct...... ..dataR.
00000040: 00 00 4F 67 67 53 00 02 00 00 00 00 00 00 00 00 ..OggS.. ........
00000050: 00 00 00 00 00 00 00 00 B7 8F 12 B0 01 1E 01 76 ........ .......v
00000060: 6F 72 62 69 73 00 00 00 00 01 44 AC 00 00 FF FF orbis... ..D.....
00000070: FF FF 0F FA 00 00 FF FF FF FF B8 01 4F 67 67 53 ........ ....OggS
00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 ........ ........
00000090: 00 00 7D 31 CB 1F 0F 46 FF FF FF FF FF FF FF FF ..}1...F ........
000000A0: FF FF FF FF FF DE 03 76 6F 72 62 69 73 20 00 00 .......v orbis ..
000000B0: 00 58 69 70 68 6F 70 68 6F 72 75 73 20 6C 69 62 .Xiphoph orus lib
000000C0: 56 6F 72 62 69 73 20 49 20 32 30 30 31 31 32 33 Vorbis I 2001123
000000D0: 31 01 00 00 00 12 00 00 00 45 4E 43 4F 44 45 52 1....... .ENCODER
000000E0: 3D 76 6F 72 62 69 73 2E 61 63 6D 01 05 76 6F 72 =vorbis. acm..vor
000000F0: 62 69 73 25 42 43 56 01 00 40 00 00 80 60 DA 11 bis%BCV. .@...`..
00000100: 05 36 C5 A4 94 52 9E 71 58 2A 29 3A E5 A4 94 52 .6...R.q X*):...R
00000110: B2 C3 22 3B 4D CA 27 A5 94 52 4A 29 A5 7C 52 CA ..";M.'. .RJ).|R.
00000120: 18 63 8C 31 82 D0 90 55 00 00 10 00 00 41 0C 65 .c.1...U .....A.e
00000130: 06 59 C9 1C 17 5F 83 46 0C 75 06 59 C9 1C 17 DF .Y..._.F .u.Y....
00000140: 7B 89 90 A2 4A 39 0C A1 05 21 84 F0 A5 02 9B 3A {...J9.. .!.....:
00000150: 10 2E 05 21 84 20 34 64 15 00 00 08 00 C0 20 84 ...!. 4d ...... .
00000160: 10 42 08 21 85 14 52 48 21 85 14 62 88 21 86 18 .B.!..RH !..b.!..

Do you see what I see?

If you wanted to play this, I would suggest stripping off the first 68 bytes.
You will then have a standard Ogg Vorbis file.

Erik 

-- 
+-----------------------------------------------------------+
  Erik de Castro Lopo  nospam_AT_mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
"I once worked for a company where as part of the BS5750 "Quality"
process I attended a meeting where I was informed that it was Company
Policy not to use free software. When I asked him for his written
authorisation for me to remove X Windows from our Sun workstations,
he backtracked."   -- Phil Hunt

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