diff options
Diffstat (limited to 'pd/portaudio/src/common/pa_dither.h')
| -rw-r--r-- | pd/portaudio/src/common/pa_dither.h | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/pd/portaudio/src/common/pa_dither.h b/pd/portaudio/src/common/pa_dither.h index e77ce470..a5131b27 100644 --- a/pd/portaudio/src/common/pa_dither.h +++ b/pd/portaudio/src/common/pa_dither.h @@ -1,7 +1,7 @@ #ifndef PA_DITHER_H #define PA_DITHER_H /* - * $Id: pa_dither.h 1097 2006-08-26 08:27:53Z rossb $ + * $Id: pa_dither.h 1418 2009-10-12 21:00:53Z philburk $ * Portable Audio I/O Library triangular dither generator * * Based on the Open Source API proposed by Ross Bencina @@ -44,18 +44,24 @@ @brief Functions for generating dither noise */ +#include "pa_types.h" + #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ +/* Note that the linear congruential algorithm requires 32 bit integers + * because it uses arithmetic overflow. So use PaUint32 instead of + * unsigned long so it will work on 64 bit systems. + */ /** @brief State needed to generate a dither signal */ typedef struct PaUtilTriangularDitherGenerator{ - unsigned long previous; - unsigned long randSeed1; - unsigned long randSeed2; + PaUint32 previous; + PaUint32 randSeed1; + PaUint32 randSeed2; } PaUtilTriangularDitherGenerator; @@ -73,9 +79,9 @@ void PaUtil_InitializeTriangularDitherState( PaUtilTriangularDitherGenerator *di signed short out = (signed short)(((in>>1) + dither) >> 15); </pre> @return - A signed long with a range of +32767 to -32768 + A signed 32-bit integer with a range of +32767 to -32768 */ -signed long PaUtil_Generate16BitTriangularDither( PaUtilTriangularDitherGenerator *ditherState ); +PaInt32 PaUtil_Generate16BitTriangularDither( PaUtilTriangularDitherGenerator *ditherState ); /** |