@database SFX

(C) Copyright 1993-1996 Stefan Kost
All Rights Reserved

@Remark $VER: IFF-8SVX.guide (26.11.95)
@Remark AmigaGuide-OnLine-Help for SoundFX

@master /guides/sfx.guide
@index /guides/sfx-index.guide/index

@node main "Loader : IFF-8SVX"

Loader : IFF-8SVX
-----------------

Description :
	loads IFF-8SVX Samples
	incl. 	Loops
		Multi-Channelsamples
		8/16/combined bit Samples
		compressed (only 8bit)
	This is the most wide spread sound-file format on the Amiga.It's build
	like any other IFF file making it a very flexible format whilst retain-
	ing compatibility. Right now it supports multioctave-samples, mono/ste-
	reo samples and one type of compression. The IFF-8SV format is one of
	the few that saves loops. SFX also supports quadrosamples, 16-bit and
	combined samples. Here's an explanation of all the expanded features.
	I got the description of the combined samples from the freeware program
	SoundBox by Richard Körbner. This format saves the full 16-bit data of
	a sample. Is this sample loaded into a standard program (supporting
	only IFF-8SVX) then it loads as a standard 8-bit sample. If a program
	however knows this format it loads it as a 16-bit sample. The trick in
	this is to save the lower eight bits of the 16-bit sample in an extra
	chunk. This chunk carries the mark 'LBDY'. The higher eight bits are
	stored in the usual 'BODY' chunk. When SFX saves a sample in the 16-
	bit format it creates a 'BITS' chunk of the following structure :
	struct chunk_bits
	{
		char	id[4];		/* 'BITS' */
		ULONG	len;		/* 4L */
		ULONG	bits;		/* 8/16 bit so far supported */
	};
	In addition the 'CHAN' chunk has been extended. With a data value of 30,
	it is a quadrosample.

Prefs :
	none
@endnode