src/audio/SDL_wave.h
author Sam Lantinga <slouken@libsdl.org>
Sun, 21 Sep 2003 19:25:45 +0000
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/* WAVE files are little-endian */
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/*******************************************/
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/* Define values for Microsoft WAVE format */
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/*******************************************/
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#define RIFF		0x46464952		/* "RIFF" */
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#define WAVE		0x45564157		/* "WAVE" */
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#define FACT		0x74636166		/* "fact" */
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#define LIST		0x5453494c		/* "LIST" */
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#define FMT		0x20746D66		/* "fmt " */
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#define DATA		0x61746164		/* "data" */
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#define PCM_CODE	0x0001
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#define MS_ADPCM_CODE	0x0002
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#define IMA_ADPCM_CODE	0x0011
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#define WAVE_MONO	1
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#define WAVE_STEREO	2
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/* Normally, these three chunks come consecutively in a WAVE file */
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typedef struct WaveFMT {
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/* Not saved in the chunk we read:
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	Uint32	FMTchunk;
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	Uint32	fmtlen;
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*/
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	Uint16	encoding;	
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	Uint16	channels;		/* 1 = mono, 2 = stereo */
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	Uint32	frequency;		/* One of 11025, 22050, or 44100 Hz */
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	Uint32	byterate;		/* Average bytes per second */
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	Uint16	blockalign;		/* Bytes per sample block */
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	Uint16	bitspersample;		/* One of 8, 12, 16, or 4 for ADPCM */
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} WaveFMT;
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/* The general chunk found in the WAVE file */
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typedef struct Chunk {
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	Uint32 magic;
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	Uint32 length;
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	Uint8 *data;
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} Chunk;
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