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pa_converters.c
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pa_converters.c
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/*
* $Id$
* Portable Audio I/O Library sample conversion mechanism
*
* Based on the Open Source API proposed by Ross Bencina
* Copyright (c) 1999-2002 Phil Burk, Ross Bencina
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* The text above constitutes the entire PortAudio license; however,
* the PortAudio community also makes the following non-binding requests:
*
* Any person wishing to distribute modifications to the Software is
* requested to send the modifications to the original developer so that
* they can be incorporated into the canonical version. It is also
* requested that these non-binding requests be included along with the
* license above.
*/
/** @file
@ingroup common_src
@brief Conversion function implementations.
If the C9x function lrintf() is available, define PA_USE_C99_LRINTF to use it
@todo Consider whether functions which dither but don't clip should exist,
V18 automatically enabled clipping whenever dithering was selected. Perhaps
we should do the same.
see: "require clipping for dithering sample conversion functions?"
http://www.portaudio.com/trac/ticket/112
@todo implement the converters marked IMPLEMENT ME: Int32_To_Int24_Dither,
Int32_To_UInt8_Dither, Int24_To_Int16_Dither, Int24_To_Int8_Dither,
Int24_To_UInt8_Dither, Int16_To_Int8_Dither, Int16_To_UInt8_Dither
see: "some conversion functions are not implemented in pa_converters.c"
http://www.portaudio.com/trac/ticket/35
@todo review the converters marked REVIEW: Float32_To_Int32,
Float32_To_Int32_Dither, Float32_To_Int32_Clip, Float32_To_Int32_DitherClip,
Int32_To_Int16_Dither, Int32_To_Int8_Dither, Int16_To_Int32
*/
#include "pa_converters.h"
#include "pa_dither.h"
#include "pa_endianness.h"
#include "pa_types.h"
PaSampleFormat PaUtil_SelectClosestAvailableFormat(
PaSampleFormat availableFormats, PaSampleFormat format )
{
PaSampleFormat result;
format &= ~paNonInterleaved;
availableFormats &= ~paNonInterleaved;
if( (format & availableFormats) == 0 )
{
/* NOTE: this code depends on the sample format constants being in
descending order of quality - ie best quality is 0
FIXME: should write an assert which checks that all of the
known constants conform to that requirement.
*/
if( format != 0x01 )
{
/* scan for better formats */
result = format;
do
{
result >>= 1;
}
while( (result & availableFormats) == 0 && result != 0 );
}
else
{
result = 0;
}
if( result == 0 ){
/* scan for worse formats */
result = format;
do
{
result <<= 1;
}
while( (result & availableFormats) == 0 && result != paCustomFormat );
if( (result & availableFormats) == 0 )
result = paSampleFormatNotSupported;
}
}else{
result = format;
}
return result;
}
/* -------------------------------------------------------------------------- */
#define PA_SELECT_FORMAT_( format, float32, int32, int24, int16, int8, uint8 ) \
switch( format & ~paNonInterleaved ){ \
case paFloat32: \
float32 \
case paInt32: \
int32 \
case paInt24: \
int24 \
case paInt16: \
int16 \
case paInt8: \
int8 \
case paUInt8: \
uint8 \
default: return 0; \
}
/* -------------------------------------------------------------------------- */
#define PA_SELECT_CONVERTER_DITHER_CLIP_( flags, source, destination ) \
if( flags & paClipOff ){ /* no clip */ \
if( flags & paDitherOff ){ /* no dither */ \
return paConverters. source ## _To_ ## destination; \
}else{ /* dither */ \
return paConverters. source ## _To_ ## destination ## _Dither; \
} \
}else{ /* clip */ \
if( flags & paDitherOff ){ /* no dither */ \
return paConverters. source ## _To_ ## destination ## _Clip; \
}else{ /* dither */ \
return paConverters. source ## _To_ ## destination ## _DitherClip; \
} \
}
/* -------------------------------------------------------------------------- */
#define PA_SELECT_CONVERTER_DITHER_( flags, source, destination ) \
if( flags & paDitherOff ){ /* no dither */ \
return paConverters. source ## _To_ ## destination; \
}else{ /* dither */ \
return paConverters. source ## _To_ ## destination ## _Dither; \
}
/* -------------------------------------------------------------------------- */
#define PA_USE_CONVERTER_( source, destination )\
return paConverters. source ## _To_ ## destination;
/* -------------------------------------------------------------------------- */
#define PA_UNITY_CONVERSION_( wordlength )\
return paConverters. Copy_ ## wordlength ## _To_ ## wordlength;
/* -------------------------------------------------------------------------- */
PaUtilConverter* PaUtil_SelectConverter( PaSampleFormat sourceFormat,
PaSampleFormat destinationFormat, PaStreamFlags flags )
{
PA_SELECT_FORMAT_( sourceFormat,
/* paFloat32: */
PA_SELECT_FORMAT_( destinationFormat,
/* paFloat32: */ PA_UNITY_CONVERSION_( 32 ),
/* paInt32: */ PA_SELECT_CONVERTER_DITHER_CLIP_( flags, Float32, Int32 ),
/* paInt24: */ PA_SELECT_CONVERTER_DITHER_CLIP_( flags, Float32, Int24 ),
/* paInt16: */ PA_SELECT_CONVERTER_DITHER_CLIP_( flags, Float32, Int16 ),
/* paInt8: */ PA_SELECT_CONVERTER_DITHER_CLIP_( flags, Float32, Int8 ),
/* paUInt8: */ PA_SELECT_CONVERTER_DITHER_CLIP_( flags, Float32, UInt8 )
),
/* paInt32: */
PA_SELECT_FORMAT_( destinationFormat,
/* paFloat32: */ PA_USE_CONVERTER_( Int32, Float32 ),
/* paInt32: */ PA_UNITY_CONVERSION_( 32 ),
/* paInt24: */ PA_SELECT_CONVERTER_DITHER_( flags, Int32, Int24 ),
/* paInt16: */ PA_SELECT_CONVERTER_DITHER_( flags, Int32, Int16 ),
/* paInt8: */ PA_SELECT_CONVERTER_DITHER_( flags, Int32, Int8 ),
/* paUInt8: */ PA_SELECT_CONVERTER_DITHER_( flags, Int32, UInt8 )
),
/* paInt24: */
PA_SELECT_FORMAT_( destinationFormat,
/* paFloat32: */ PA_USE_CONVERTER_( Int24, Float32 ),
/* paInt32: */ PA_USE_CONVERTER_( Int24, Int32 ),
/* paInt24: */ PA_UNITY_CONVERSION_( 24 ),
/* paInt16: */ PA_SELECT_CONVERTER_DITHER_( flags, Int24, Int16 ),
/* paInt8: */ PA_SELECT_CONVERTER_DITHER_( flags, Int24, Int8 ),
/* paUInt8: */ PA_SELECT_CONVERTER_DITHER_( flags, Int24, UInt8 )
),
/* paInt16: */
PA_SELECT_FORMAT_( destinationFormat,
/* paFloat32: */ PA_USE_CONVERTER_( Int16, Float32 ),
/* paInt32: */ PA_USE_CONVERTER_( Int16, Int32 ),
/* paInt24: */ PA_USE_CONVERTER_( Int16, Int24 ),
/* paInt16: */ PA_UNITY_CONVERSION_( 16 ),
/* paInt8: */ PA_SELECT_CONVERTER_DITHER_( flags, Int16, Int8 ),
/* paUInt8: */ PA_SELECT_CONVERTER_DITHER_( flags, Int16, UInt8 )
),
/* paInt8: */
PA_SELECT_FORMAT_( destinationFormat,
/* paFloat32: */ PA_USE_CONVERTER_( Int8, Float32 ),
/* paInt32: */ PA_USE_CONVERTER_( Int8, Int32 ),
/* paInt24: */ PA_USE_CONVERTER_( Int8, Int24 ),
/* paInt16: */ PA_USE_CONVERTER_( Int8, Int16 ),
/* paInt8: */ PA_UNITY_CONVERSION_( 8 ),
/* paUInt8: */ PA_USE_CONVERTER_( Int8, UInt8 )
),
/* paUInt8: */
PA_SELECT_FORMAT_( destinationFormat,
/* paFloat32: */ PA_USE_CONVERTER_( UInt8, Float32 ),
/* paInt32: */ PA_USE_CONVERTER_( UInt8, Int32 ),
/* paInt24: */ PA_USE_CONVERTER_( UInt8, Int24 ),
/* paInt16: */ PA_USE_CONVERTER_( UInt8, Int16 ),
/* paInt8: */ PA_USE_CONVERTER_( UInt8, Int8 ),
/* paUInt8: */ PA_UNITY_CONVERSION_( 8 )
)
)
}
/* -------------------------------------------------------------------------- */
#ifdef PA_NO_STANDARD_CONVERTERS
/* -------------------------------------------------------------------------- */
PaUtilConverterTable paConverters = {
0, /* PaUtilConverter *Float32_To_Int32; */
0, /* PaUtilConverter *Float32_To_Int32_Dither; */
0, /* PaUtilConverter *Float32_To_Int32_Clip; */
0, /* PaUtilConverter *Float32_To_Int32_DitherClip; */
0, /* PaUtilConverter *Float32_To_Int24; */
0, /* PaUtilConverter *Float32_To_Int24_Dither; */
0, /* PaUtilConverter *Float32_To_Int24_Clip; */
0, /* PaUtilConverter *Float32_To_Int24_DitherClip; */
0, /* PaUtilConverter *Float32_To_Int16; */
0, /* PaUtilConverter *Float32_To_Int16_Dither; */
0, /* PaUtilConverter *Float32_To_Int16_Clip; */
0, /* PaUtilConverter *Float32_To_Int16_DitherClip; */
0, /* PaUtilConverter *Float32_To_Int8; */
0, /* PaUtilConverter *Float32_To_Int8_Dither; */
0, /* PaUtilConverter *Float32_To_Int8_Clip; */
0, /* PaUtilConverter *Float32_To_Int8_DitherClip; */
0, /* PaUtilConverter *Float32_To_UInt8; */
0, /* PaUtilConverter *Float32_To_UInt8_Dither; */
0, /* PaUtilConverter *Float32_To_UInt8_Clip; */
0, /* PaUtilConverter *Float32_To_UInt8_DitherClip; */
0, /* PaUtilConverter *Int32_To_Float32; */
0, /* PaUtilConverter *Int32_To_Int24; */
0, /* PaUtilConverter *Int32_To_Int24_Dither; */
0, /* PaUtilConverter *Int32_To_Int16; */
0, /* PaUtilConverter *Int32_To_Int16_Dither; */
0, /* PaUtilConverter *Int32_To_Int8; */
0, /* PaUtilConverter *Int32_To_Int8_Dither; */
0, /* PaUtilConverter *Int32_To_UInt8; */
0, /* PaUtilConverter *Int32_To_UInt8_Dither; */
0, /* PaUtilConverter *Int24_To_Float32; */
0, /* PaUtilConverter *Int24_To_Int32; */
0, /* PaUtilConverter *Int24_To_Int16; */
0, /* PaUtilConverter *Int24_To_Int16_Dither; */
0, /* PaUtilConverter *Int24_To_Int8; */
0, /* PaUtilConverter *Int24_To_Int8_Dither; */
0, /* PaUtilConverter *Int24_To_UInt8; */
0, /* PaUtilConverter *Int24_To_UInt8_Dither; */
0, /* PaUtilConverter *Int16_To_Float32; */
0, /* PaUtilConverter *Int16_To_Int32; */
0, /* PaUtilConverter *Int16_To_Int24; */
0, /* PaUtilConverter *Int16_To_Int8; */
0, /* PaUtilConverter *Int16_To_Int8_Dither; */
0, /* PaUtilConverter *Int16_To_UInt8; */
0, /* PaUtilConverter *Int16_To_UInt8_Dither; */
0, /* PaUtilConverter *Int8_To_Float32; */
0, /* PaUtilConverter *Int8_To_Int32; */
0, /* PaUtilConverter *Int8_To_Int24 */
0, /* PaUtilConverter *Int8_To_Int16; */
0, /* PaUtilConverter *Int8_To_UInt8; */
0, /* PaUtilConverter *UInt8_To_Float32; */
0, /* PaUtilConverter *UInt8_To_Int32; */
0, /* PaUtilConverter *UInt8_To_Int24; */
0, /* PaUtilConverter *UInt8_To_Int16; */
0, /* PaUtilConverter *UInt8_To_Int8; */
0, /* PaUtilConverter *Copy_8_To_8; */
0, /* PaUtilConverter *Copy_16_To_16; */
0, /* PaUtilConverter *Copy_24_To_24; */
0 /* PaUtilConverter *Copy_32_To_32; */
};
/* -------------------------------------------------------------------------- */
#else /* PA_NO_STANDARD_CONVERTERS is not defined */
/* -------------------------------------------------------------------------- */
#define PA_CLIP_( val, min, max )\
{ val = ((val) < (min)) ? (min) : (((val) > (max)) ? (max) : (val)); }
static const float const_1_div_128_ = 1.0f / 128.0f; /* 8 bit multiplier */
static const float const_1_div_32768_ = 1.0f / 32768.f; /* 16 bit multiplier */
static const double const_1_div_2147483648_ = 1.0 / 2147483648.0; /* 32 bit multiplier */
/* -------------------------------------------------------------------------- */
static void Float32_To_Int32(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
PaInt32 *dest = (PaInt32*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
/* REVIEW */
#ifdef PA_USE_C99_LRINTF
float scaled = *src * 0x7FFFFFFF;
*dest = lrintf(scaled-0.5f);
#else
double scaled = *src * 0x7FFFFFFF;
*dest = (PaInt32) scaled;
#endif
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int32_Dither(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
PaInt32 *dest = (PaInt32*)destinationBuffer;
while( count-- )
{
/* REVIEW */
#ifdef PA_USE_C99_LRINTF
float dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
float dithered = ((float)*src * (2147483646.0f)) + dither;
*dest = lrintf(dithered - 0.5f);
#else
double dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
double dithered = ((double)*src * (2147483646.0)) + dither;
*dest = (PaInt32) dithered;
#endif
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int32_Clip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
PaInt32 *dest = (PaInt32*)destinationBuffer;
(void) ditherGenerator; /* unused parameter */
while( count-- )
{
/* REVIEW */
#ifdef PA_USE_C99_LRINTF
float scaled = *src * 0x7FFFFFFF;
PA_CLIP_( scaled, -2147483648.f, 2147483647.f );
*dest = lrintf(scaled-0.5f);
#else
double scaled = *src * 0x7FFFFFFF;
PA_CLIP_( scaled, -2147483648., 2147483647. );
*dest = (PaInt32) scaled;
#endif
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int32_DitherClip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
PaInt32 *dest = (PaInt32*)destinationBuffer;
while( count-- )
{
/* REVIEW */
#ifdef PA_USE_C99_LRINTF
float dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
float dithered = ((float)*src * (2147483646.0f)) + dither;
PA_CLIP_( dithered, -2147483648.f, 2147483647.f );
*dest = lrintf(dithered-0.5f);
#else
double dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
double dithered = ((double)*src * (2147483646.0)) + dither;
PA_CLIP_( dithered, -2147483648., 2147483647. );
*dest = (PaInt32) dithered;
#endif
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int24(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
PaInt32 temp;
(void) ditherGenerator; /* unused parameter */
while( count-- )
{
/* convert to 32 bit and drop the low 8 bits */
double scaled = (double)(*src) * 2147483647.0;
temp = (PaInt32) scaled;
#if defined(PA_LITTLE_ENDIAN)
dest[0] = (unsigned char)(temp >> 8);
dest[1] = (unsigned char)(temp >> 16);
dest[2] = (unsigned char)(temp >> 24);
#elif defined(PA_BIG_ENDIAN)
dest[0] = (unsigned char)(temp >> 24);
dest[1] = (unsigned char)(temp >> 16);
dest[2] = (unsigned char)(temp >> 8);
#endif
src += sourceStride;
dest += destinationStride * 3;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int24_Dither(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
PaInt32 temp;
while( count-- )
{
/* convert to 32 bit and drop the low 8 bits */
double dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
double dithered = ((double)*src * (2147483646.0)) + dither;
temp = (PaInt32) dithered;
#if defined(PA_LITTLE_ENDIAN)
dest[0] = (unsigned char)(temp >> 8);
dest[1] = (unsigned char)(temp >> 16);
dest[2] = (unsigned char)(temp >> 24);
#elif defined(PA_BIG_ENDIAN)
dest[0] = (unsigned char)(temp >> 24);
dest[1] = (unsigned char)(temp >> 16);
dest[2] = (unsigned char)(temp >> 8);
#endif
src += sourceStride;
dest += destinationStride * 3;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int24_Clip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
PaInt32 temp;
(void) ditherGenerator; /* unused parameter */
while( count-- )
{
/* convert to 32 bit and drop the low 8 bits */
double scaled = *src * 0x7FFFFFFF;
PA_CLIP_( scaled, -2147483648., 2147483647. );
temp = (PaInt32) scaled;
#if defined(PA_LITTLE_ENDIAN)
dest[0] = (unsigned char)(temp >> 8);
dest[1] = (unsigned char)(temp >> 16);
dest[2] = (unsigned char)(temp >> 24);
#elif defined(PA_BIG_ENDIAN)
dest[0] = (unsigned char)(temp >> 24);
dest[1] = (unsigned char)(temp >> 16);
dest[2] = (unsigned char)(temp >> 8);
#endif
src += sourceStride;
dest += destinationStride * 3;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int24_DitherClip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
PaInt32 temp;
while( count-- )
{
/* convert to 32 bit and drop the low 8 bits */
double dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
double dithered = ((double)*src * (2147483646.0)) + dither;
PA_CLIP_( dithered, -2147483648., 2147483647. );
temp = (PaInt32) dithered;
#if defined(PA_LITTLE_ENDIAN)
dest[0] = (unsigned char)(temp >> 8);
dest[1] = (unsigned char)(temp >> 16);
dest[2] = (unsigned char)(temp >> 24);
#elif defined(PA_BIG_ENDIAN)
dest[0] = (unsigned char)(temp >> 24);
dest[1] = (unsigned char)(temp >> 16);
dest[2] = (unsigned char)(temp >> 8);
#endif
src += sourceStride;
dest += destinationStride * 3;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int16(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
PaInt16 *dest = (PaInt16*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
#ifdef PA_USE_C99_LRINTF
float tempf = (*src * (32767.0f)) ;
*dest = lrintf(tempf-0.5f);
#else
short samp = (short) (*src * (32767.0f));
*dest = samp;
#endif
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int16_Dither(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
PaInt16 *dest = (PaInt16*)destinationBuffer;
while( count-- )
{
float dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
float dithered = (*src * (32766.0f)) + dither;
#ifdef PA_USE_C99_LRINTF
*dest = lrintf(dithered-0.5f);
#else
*dest = (PaInt16) dithered;
#endif
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int16_Clip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
PaInt16 *dest = (PaInt16*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
#ifdef PA_USE_C99_LRINTF
long samp = lrintf((*src * (32767.0f)) -0.5f);
#else
long samp = (PaInt32) (*src * (32767.0f));
#endif
PA_CLIP_( samp, -0x8000, 0x7FFF );
*dest = (PaInt16) samp;
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int16_DitherClip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
PaInt16 *dest = (PaInt16*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
float dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
float dithered = (*src * (32766.0f)) + dither;
PaInt32 samp = (PaInt32) dithered;
PA_CLIP_( samp, -0x8000, 0x7FFF );
#ifdef PA_USE_C99_LRINTF
*dest = lrintf(samp-0.5f);
#else
*dest = (PaInt16) samp;
#endif
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int8(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
signed char *dest = (signed char*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
signed char samp = (signed char) (*src * (127.0f));
*dest = samp;
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int8_Dither(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
signed char *dest = (signed char*)destinationBuffer;
while( count-- )
{
float dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
float dithered = (*src * (126.0f)) + dither;
PaInt32 samp = (PaInt32) dithered;
*dest = (signed char) samp;
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int8_Clip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
signed char *dest = (signed char*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
PaInt32 samp = (PaInt32)(*src * (127.0f));
PA_CLIP_( samp, -0x80, 0x7F );
*dest = (signed char) samp;
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_Int8_DitherClip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
signed char *dest = (signed char*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
float dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
float dithered = (*src * (126.0f)) + dither;
PaInt32 samp = (PaInt32) dithered;
PA_CLIP_( samp, -0x80, 0x7F );
*dest = (signed char) samp;
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_UInt8(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
unsigned char samp = (unsigned char)(128 + ((unsigned char) (*src * (127.0f))));
*dest = samp;
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_UInt8_Dither(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
while( count-- )
{
float dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
float dithered = (*src * (126.0f)) + dither;
PaInt32 samp = (PaInt32) dithered;
*dest = (unsigned char) (128 + samp);
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_UInt8_Clip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
PaInt32 samp = 128 + (PaInt32)(*src * (127.0f));
PA_CLIP_( samp, 0x0000, 0x00FF );
*dest = (unsigned char) samp;
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Float32_To_UInt8_DitherClip(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
float *src = (float*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
float dither = PaUtil_GenerateFloatTriangularDither( ditherGenerator );
/* use smaller scaler to prevent overflow when we add the dither */
float dithered = (*src * (126.0f)) + dither;
PaInt32 samp = 128 + (PaInt32) dithered;
PA_CLIP_( samp, 0x0000, 0x00FF );
*dest = (unsigned char) samp;
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Int32_To_Float32(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
PaInt32 *src = (PaInt32*)sourceBuffer;
float *dest = (float*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
*dest = (float) ((double)*src * const_1_div_2147483648_);
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Int32_To_Int24(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
PaInt32 *src = (PaInt32*)sourceBuffer;
unsigned char *dest = (unsigned char*)destinationBuffer;
(void) ditherGenerator; /* unused parameter */
while( count-- )
{
/* REVIEW */
#if defined(PA_LITTLE_ENDIAN)
dest[0] = (unsigned char)(*src >> 8);
dest[1] = (unsigned char)(*src >> 16);
dest[2] = (unsigned char)(*src >> 24);
#elif defined(PA_BIG_ENDIAN)
dest[0] = (unsigned char)(*src >> 24);
dest[1] = (unsigned char)(*src >> 16);
dest[2] = (unsigned char)(*src >> 8);
#endif
src += sourceStride;
dest += destinationStride * 3;
}
}
/* -------------------------------------------------------------------------- */
static void Int32_To_Int24_Dither(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
(void) destinationBuffer; /* unused parameters */
(void) destinationStride; /* unused parameters */
(void) sourceBuffer; /* unused parameters */
(void) sourceStride; /* unused parameters */
(void) count; /* unused parameters */
(void) ditherGenerator; /* unused parameters */
/* IMPLEMENT ME */
}
/* -------------------------------------------------------------------------- */
static void Int32_To_Int16(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
PaInt32 *src = (PaInt32*)sourceBuffer;
PaInt16 *dest = (PaInt16*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )
{
*dest = (PaInt16) ((*src) >> 16);
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Int32_To_Int16_Dither(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
PaInt32 *src = (PaInt32*)sourceBuffer;
PaInt16 *dest = (PaInt16*)destinationBuffer;
PaInt32 dither;
while( count-- )
{
/* REVIEW */
dither = PaUtil_Generate16BitTriangularDither( ditherGenerator );
*dest = (PaInt16) ((((*src)>>1) + dither) >> 15);
src += sourceStride;
dest += destinationStride;
}
}
/* -------------------------------------------------------------------------- */
static void Int32_To_Int8(
void *destinationBuffer, signed int destinationStride,
void *sourceBuffer, signed int sourceStride,
unsigned int count, struct PaUtilTriangularDitherGenerator *ditherGenerator )
{
PaInt32 *src = (PaInt32*)sourceBuffer;
signed char *dest = (signed char*)destinationBuffer;
(void)ditherGenerator; /* unused parameter */
while( count-- )