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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is SDL_free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Lesser General Public
      7     License as published by the Free Software Foundation; either
      8     version 2.1 of the License, or (at your option) any later version.
      9 
     10     This library is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13     Lesser General Public License for more details.
     14 
     15     You should have received a copy of the GNU Lesser General Public
     16     License along with this library; if not, write to the Free Software
     17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 /* WAVE files are little-endian */
     25 
     26 /*******************************************/
     27 /* Define values for Microsoft WAVE format */
     28 /*******************************************/
     29 #define RIFF		0x46464952		/* "RIFF" */
     30 #define WAVE		0x45564157		/* "WAVE" */
     31 #define FACT		0x74636166		/* "fact" */
     32 #define LIST		0x5453494c		/* "LIST" */
     33 #define FMT		0x20746D66		/* "fmt " */
     34 #define DATA		0x61746164		/* "data" */
     35 #define PCM_CODE	0x0001
     36 #define MS_ADPCM_CODE	0x0002
     37 #define IMA_ADPCM_CODE	0x0011
     38 #define MP3_CODE	0x0055
     39 #define WAVE_MONO	1
     40 #define WAVE_STEREO	2
     41 
     42 /* Normally, these three chunks come consecutively in a WAVE file */
     43 typedef struct WaveFMT {
     44 /* Not saved in the chunk we read:
     45 	Uint32	FMTchunk;
     46 	Uint32	fmtlen;
     47 */
     48 	Uint16	encoding;
     49 	Uint16	channels;		/* 1 = mono, 2 = stereo */
     50 	Uint32	frequency;		/* One of 11025, 22050, or 44100 Hz */
     51 	Uint32	byterate;		/* Average bytes per second */
     52 	Uint16	blockalign;		/* Bytes per sample block */
     53 	Uint16	bitspersample;		/* One of 8, 12, 16, or 4 for ADPCM */
     54 } WaveFMT;
     55 
     56 /* The general chunk found in the WAVE file */
     57 typedef struct Chunk {
     58 	Uint32 magic;
     59 	Uint32 length;
     60 	Uint8 *data;
     61 } Chunk;
     62 
     63