IFF / 8SVX - Revision history

>Atari74user at 19:46, 25 March 2016

2016-03-25T19:46:13Z

← Older revision		Revision as of 15:46, 25 March 2016
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	Interchange File Format (IFF) is a format developed by ~~electronic arts~~ in the 80's. It is the predominant format on the Commodore Amiga, and is a chunked format, which can be used to store any type of data. However it is predominantly used to store images, animations and audio.		Interchange File Format (IFF) is a format developed by Electronic Arts in the 1980's. It was the predominant format on the Commodore Amiga, and is a chunked format, which can be used to store any type of data. However it is predominantly used to store images, animations and audio.

>Atari74user at 23:39, 23 March 2016

2016-03-23T23:39:00Z

← Older revision		Revision as of 19:39, 23 March 2016
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	Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Commodore Amiga~~. It~~ is a chunked format, which can be used to store any type of data~~, but~~ it is predominantly used to store images, animations and audio.		Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Commodore Amiga, and is a chunked format, which can be used to store any type of data. However it is predominantly used to store images, animations and audio.

>Atari74user at 23:36, 23 March 2016

2016-03-23T23:36:56Z

← Older revision		Revision as of 19:36, 23 March 2016
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	Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Amiga ~~computer~~. It is a chunked format, which can be used to store any type of data, but it is predominantly used to store images, animations and audio.		Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Commodore Amiga. It is a chunked format, which can be used to store any type of data, but it is predominantly used to store images, animations and audio.

>Atari74user at 23:25, 23 March 2016

2016-03-23T23:25:33Z

← Older revision		Revision as of 19:25, 23 March 2016
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	bytes that follow the "FORM" and byte count longwords. (Numbers are stored		bytes that follow the "FORM" and byte count longwords. (Numbers are stored
	in M68000 form, high order byte first.)		in M68000 form, high order byte first.)


	~~------------------------------------------~~


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	"(c) " may be present, and may be in any order. You will have to check the		"(c) " may be present, and may be in any order. You will have to check the
	byte count in each chunk to determine how many bytes to skip.		byte count in each chunk to determine how many bytes to skip.



			Back to [[Sample File Formats (Audio)]]

>Atari74user at 23:23, 23 March 2016

2016-03-23T23:23:58Z

← Older revision		Revision as of 19:23, 23 March 2016
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	Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Amiga computer. It is a chunked format, which can be used to store any type of data, but it is predominantly used to store images, animations and audio.		Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Amiga computer. It is a chunked format, which can be used to store any type of data, but it is predominantly used to store images, animations and audio.


	The first 12 bytes of an IFF file are used to distinguish between an Amiga		The first 12 bytes of an IFF file are used to distinguish between an Amiga

>Atari74user at 23:23, 23 March 2016

2016-03-23T23:23:42Z

← Older revision		Revision as of 19:23, 23 March 2016
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	FutureSound audio file, 15000 samples at 10.000KHz, file is 15048 bytes long.		FutureSound audio file, 15000 samples at 10.000KHz, file is 15048 bytes long.


	0000: 464F524D 00003AC0 38535658 56484452 FORM..:.8SVXVHDR		0000: 464F524D 00003AC0 38535658 56484452 FORM..:.8SVXVHDR

>Atari74user at 23:23, 23 March 2016

2016-03-23T23:23:30Z

← Older revision		Revision as of 19:23, 23 March 2016
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	10000 1 0 1.0 B O D Y 15000		10000 1 0 1.0 B O D Y 15000


	0000000..03 = "FORM", identifies this as an IFF format file.		0000000..03 = "FORM", identifies this as an IFF format file.
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	FORM+03..07 = "8SVX", identifies this as an 8-bit sampled voice.		FORM+03..07 = "8SVX", identifies this as an 8-bit sampled voice.


	????+00..03 = "VHDR", Voice8Header, describes the parameters for the BODY.		????+00..03 = "VHDR", Voice8Header, describes the parameters for the BODY.
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	VHDR+14..17 (FIXED) = volume. (The number 65536 means 1.0 or full volume.)		VHDR+14..17 (FIXED) = volume. (The number 65536 means 1.0 or full volume.)


	????+00..03 = "BODY", identifies the start of the audio data.		????+00..03 = "BODY", identifies the start of the audio data.
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	BODY+04..NNNNN = Data, signed bytes, from -128 to +127.		BODY+04..NNNNN = Data, signed bytes, from -128 to +127.


	0030: 04030201 02030303 04050605 05060605		0030: 04030201 02030303 04050605 05060605
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	00A0: FFFEFEFE FEFEFEFF FFFFFEFF 00FFFF01		00A0: FFFEFEFE FEFEFEFF FFFFFEFF 00FFFF01


	This small section of the audio sample shows the number ranging from -5 (0xFD)		This small section of the audio sample shows the number ranging from -5 (0xFD)

>Atari74user at 23:21, 23 March 2016

2016-03-23T23:21:16Z

>Atari74user at 23:20, 23 March 2016

2016-03-23T23:20:36Z

>Atari74user: Created page with "Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Amiga computer. It is a chunked format, which can be used ..."

2016-03-23T23:19:10Z

Created page with "Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Amiga computer. It is a chunked format, which can be used ..."

New page

Interchange File Format (IFF) is a format developed by electronic arts in the 80's. It is the predominant format on the Amiga computer. It is a chunked format, which can be used to store any type of data, but it is predominantly used to store images, animations and audio.

The first 12 bytes of an IFF file are used to distinguish between an Amiga
picture (FORM-ILBM), an Amiga sound sample (FORM-8SVX), or other file
conforming to the IFF specification. The middle 4 bytes is the count of
bytes that follow the "FORM" and byte count longwords. (Numbers are stored
in M68000 form, high order byte first.)

------------------------------------------

FutureSound audio file, 15000 samples at 10.000KHz, file is 15048 bytes long.

0000: 464F524D 00003AC0 38535658 56484452 FORM..:.8SVXVHDR
F O R M 15040 8 S V X V H D R
0010: 00000014 00003A98 00000000 00000000 ......:.........
20 15000 0 0
0020: 27100100 00010000 424F4459 00003A98 '.......BODY..:.
10000 1 0 1.0 B O D Y 15000

0000000..03 = "FORM", identifies this as an IFF format file.
FORM+00..03 (ULONG) = number of bytes that follow. (Unsigned long int.)
FORM+03..07 = "8SVX", identifies this as an 8-bit sampled voice.

????+00..03 = "VHDR", Voice8Header, describes the parameters for the BODY.
VHDR+00..03 (ULONG) = number of bytes to follow.
VHDR+04..07 (ULONG) = samples in the high octave 1-shot part.
VHDR+08..0B (ULONG) = samples in the high octave repeat part.
VHDR+0C..0F (ULONG) = samples per cycle in high octave (if repeating), else 0.
VHDR+10..11 (UWORD) = samples per second. (Unsigned 16-bit quantity.)
VHDR+12 (UBYTE) = number of octaves of waveforms in sample.
VHDR+13 (UBYTE) = data compression (0=none, 1=Fibonacci-delta encoding).
VHDR+14..17 (FIXED) = volume. (The number 65536 means 1.0 or full volume.)

????+00..03 = "BODY", identifies the start of the audio data.
BODY+00..03 (ULONG) = number of bytes to follow.
BODY+04..NNNNN = Data, signed bytes, from -128 to +127.

0030: 04030201 02030303 04050605 05060605
0040: 06080806 07060505 04020202 01FF0000
0050: 00000000 FF00FFFF FFFEFDFD FDFEFFFF
0060: FDFDFF00 00FFFFFF 00000000 00FFFF00
0070: 00000000 00FF0000 00FFFEFF 00000000
0080: 00010000 000101FF FF0000FE FEFFFFFE
0090: FDFDFEFD FDFFFFFC FDFEFDFD FEFFFEFE
00A0: FFFEFEFE FEFEFEFF FFFFFEFF 00FFFF01

This small section of the audio sample shows the number ranging from -5 (0xFD)
to +8 (0x08). Warning: Do not assume that the BODY starts 48 bytes into the
file. In addition to "VHDR", chunks labeled "NAME", "AUTH", "ANNO", or
"(c) " may be present, and may be in any order. You will have to check the
byte count in each chunk to determine how many bytes to skip.

← Older revision		Revision as of 19:21, 23 March 2016
Line 6:		Line 6:
	bytes that follow the "FORM" and byte count longwords. (Numbers are stored		bytes that follow the "FORM" and byte count longwords. (Numbers are stored
	in M68000 form, high order byte first.)		in M68000 form, high order byte first.)


	------------------------------------------		------------------------------------------


	FutureSound audio file, 15000 samples at 10.000KHz, file is 15048 bytes long.		FutureSound audio file, 15000 samples at 10.000KHz, file is 15048 bytes long.

	0000: 464F524D 00003AC0 38535658 56484452 FORM..:.8SVXVHDR		0000: 464F524D 00003AC0 38535658 56484452 FORM..:.8SVXVHDR

	F O R M 15040 8 S V X V H D R		F O R M 15040 8 S V X V H D R

	0010: 00000014 00003A98 00000000 00000000 ......:.........		0010: 00000014 00003A98 00000000 00000000 ......:.........

	20 15000 0 0		20 15000 0 0

	0020: 27100100 00010000 424F4459 00003A98 '.......BODY..:.		0020: 27100100 00010000 424F4459 00003A98 '.......BODY..:.

	10000 1 0 1.0 B O D Y 15000		10000 1 0 1.0 B O D Y 15000

Line 49:		Line 56:

	0030: 04030201 02030303 04050605 05060605		0030: 04030201 02030303 04050605 05060605

	0040: 06080806 07060505 04020202 01FF0000		0040: 06080806 07060505 04020202 01FF0000

	0050: 00000000 FF00FFFF FFFEFDFD FDFEFFFF		0050: 00000000 FF00FFFF FFFEFDFD FDFEFFFF

	0060: FDFDFF00 00FFFFFF 00000000 00FFFF00		0060: FDFDFF00 00FFFFFF 00000000 00FFFF00

	0070: 00000000 00FF0000 00FFFEFF 00000000		0070: 00000000 00FF0000 00FFFEFF 00000000

	0080: 00010000 000101FF FF0000FE FEFFFFFE		0080: 00010000 000101FF FF0000FE FEFFFFFE

	0090: FDFDFEFD FDFFFFFC FDFEFDFD FEFFFEFE		0090: FDFDFEFD FDFFFFFC FDFEFDFD FEFFFEFE

	00A0: FFFEFEFE FEFEFEFF FFFFFEFF 00FFFF01		00A0: FFFEFEFE FEFEFEFF FFFFFEFF 00FFFF01

← Older revision		Revision as of 19:20, 23 March 2016
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	in M68000 form, high order byte first.)		in M68000 form, high order byte first.)

	------------------------------------------		------------------------------------------

	FutureSound audio file, 15000 samples at 10.000KHz, file is 15048 bytes long.		FutureSound audio file, 15000 samples at 10.000KHz, file is 15048 bytes long.

	0000: 464F524D 00003AC0 38535658 56484452 FORM..:.8SVXVHDR		0000: 464F524D 00003AC0 38535658 56484452 FORM..:.8SVXVHDR
	F O R M 15040 8 S V X V H D R		F O R M 15040 8 S V X V H D R
	0010: 00000014 00003A98 00000000 00000000 ......:.........		0010: 00000014 00003A98 00000000 00000000 ......:.........
	20 15000 0 0		20 15000 0 0
	0020: 27100100 00010000 424F4459 00003A98 '.......BODY..:.		0020: 27100100 00010000 424F4459 00003A98 '.......BODY..:.
	10000 1 0 1.0 B O D Y 15000		10000 1 0 1.0 B O D Y 15000

	0000000..03 = "FORM", identifies this as an IFF format file.		0000000..03 = "FORM", identifies this as an IFF format file.

	FORM+00..03 (ULONG) = number of bytes that follow. (Unsigned long int.)		FORM+00..03 (ULONG) = number of bytes that follow. (Unsigned long int.)

	FORM+03..07 = "8SVX", identifies this as an 8-bit sampled voice.		FORM+03..07 = "8SVX", identifies this as an 8-bit sampled voice.

	????+00..03 = "VHDR", Voice8Header, describes the parameters for the BODY.		????+00..03 = "VHDR", Voice8Header, describes the parameters for the BODY.

	VHDR+00..03 (ULONG) = number of bytes to follow.		VHDR+00..03 (ULONG) = number of bytes to follow.

	VHDR+04..07 (ULONG) = samples in the high octave 1-shot part.		VHDR+04..07 (ULONG) = samples in the high octave 1-shot part.

	VHDR+08..0B (ULONG) = samples in the high octave repeat part.		VHDR+08..0B (ULONG) = samples in the high octave repeat part.

	VHDR+0C..0F (ULONG) = samples per cycle in high octave (if repeating), else 0.		VHDR+0C..0F (ULONG) = samples per cycle in high octave (if repeating), else 0.

	VHDR+10..11 (UWORD) = samples per second. (Unsigned 16-bit quantity.)		VHDR+10..11 (UWORD) = samples per second. (Unsigned 16-bit quantity.)

	VHDR+12 (UBYTE) = number of octaves of waveforms in sample.		VHDR+12 (UBYTE) = number of octaves of waveforms in sample.

	VHDR+13 (UBYTE) = data compression (0=none, 1=Fibonacci-delta encoding).		VHDR+13 (UBYTE) = data compression (0=none, 1=Fibonacci-delta encoding).

	VHDR+14..17 (FIXED) = volume. (The number 65536 means 1.0 or full volume.)		VHDR+14..17 (FIXED) = volume. (The number 65536 means 1.0 or full volume.)

	????+00..03 = "BODY", identifies the start of the audio data.		????+00..03 = "BODY", identifies the start of the audio data.

	BODY+00..03 (ULONG) = number of bytes to follow.		BODY+00..03 (ULONG) = number of bytes to follow.

	BODY+04..NNNNN = Data, signed bytes, from -128 to +127.		BODY+04..NNNNN = Data, signed bytes, from -128 to +127.