PortAudio  2.0
pa_dither.h
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00001 #ifndef PA_DITHER_H
00002 #define PA_DITHER_H
00003 /*
00004  * $Id: pa_dither.h 1418 2009-10-12 21:00:53Z philburk $
00005  * Portable Audio I/O Library triangular dither generator
00006  *
00007  * Based on the Open Source API proposed by Ross Bencina
00008  * Copyright (c) 1999-2002 Phil Burk, Ross Bencina
00009  *
00010  * Permission is hereby granted, free of charge, to any person obtaining
00011  * a copy of this software and associated documentation files
00012  * (the "Software"), to deal in the Software without restriction,
00013  * including without limitation the rights to use, copy, modify, merge,
00014  * publish, distribute, sublicense, and/or sell copies of the Software,
00015  * and to permit persons to whom the Software is furnished to do so,
00016  * subject to the following conditions:
00017  *
00018  * The above copyright notice and this permission notice shall be
00019  * included in all copies or substantial portions of the Software.
00020  *
00021  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00022  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00023  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
00024  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
00025  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
00026  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00027  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00028  */
00029 
00030 /*
00031  * The text above constitutes the entire PortAudio license; however, 
00032  * the PortAudio community also makes the following non-binding requests:
00033  *
00034  * Any person wishing to distribute modifications to the Software is
00035  * requested to send the modifications to the original developer so that
00036  * they can be incorporated into the canonical version. It is also 
00037  * requested that these non-binding requests be included along with the 
00038  * license above.
00039  */
00040 
00047 #include "pa_types.h"
00048 
00049 
00050 #ifdef __cplusplus
00051 extern "C"
00052 {
00053 #endif /* __cplusplus */
00054 
00055 /* Note that the linear congruential algorithm requires 32 bit integers
00056  * because it uses arithmetic overflow. So use PaUint32 instead of
00057  * unsigned long so it will work on 64 bit systems.
00058  */
00059 
00061 typedef struct PaUtilTriangularDitherGenerator{
00062     PaUint32 previous;
00063     PaUint32 randSeed1;
00064     PaUint32 randSeed2;
00065 } PaUtilTriangularDitherGenerator;
00066 
00067 
00069 void PaUtil_InitializeTriangularDitherState( PaUtilTriangularDitherGenerator *ditherState );
00070 
00071 
00084 PaInt32 PaUtil_Generate16BitTriangularDither( PaUtilTriangularDitherGenerator *ditherState );
00085 
00086 
00099 float PaUtil_GenerateFloatTriangularDither( PaUtilTriangularDitherGenerator *ditherState );
00100 
00101 
00102 
00103 #ifdef __cplusplus
00104 }
00105 #endif /* __cplusplus */
00106 #endif /* PA_DITHER_H */

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