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/*
Copyright (C) 2000 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#ifndef _arts_convert_h
#define _arts_convert_h
#include "arts_export.h"
/*
* BC - Status (2002-03-08): conversion functions
*
* None of them will be removed or changed, so it is safe to use them in
* your apps. It is *recommended* (though not necessary) to use the new
* resampling code (Resampler) where possible.
*/
namespace Arts {
/*
* Simple conversion routines. The function names are chosen like
*
* convert_mono_FROM_TO for mono conversions
* convert_stereo_FROM_TO for stereo conversions
*
* while FROM/TO are
*
* 8 for 8bit signed data
* 16le for 16bit signed little endian
* float for float data between -1 and 1
*
* and may be prefixed by 2 to indicate that stereo is done with two seperate
* buffers or i to indicate interleaved stereo (one buffer which contains
* one sample left, one sample right, one sample left etc.)
*
* The parameter speed (for interpolations) is *not* the samplingrate, but
* a relative value. A speed of 2.0 means "play twice as fast".
*/
// upconversions from integer to float
void ARTS_EXPORT convert_mono_8_float(unsigned long samples,
unsigned char *from, float *to);
void ARTS_EXPORT interpolate_mono_8_float(unsigned long samples,
double startpos, double speed,
unsigned char *from, float *to);
void ARTS_EXPORT convert_mono_16le_float(unsigned long samples,
unsigned char *from, float *to);
void ARTS_EXPORT interpolate_mono_16le_float(unsigned long samples,
double startpos, double speed,
unsigned char *from, float *to);
void ARTS_EXPORT convert_mono_16be_float(unsigned long samples,
unsigned char *from, float *to);
void ARTS_EXPORT interpolate_mono_16be_float(unsigned long samples,
double startpos, double speed,
unsigned char *from, float *to);
void ARTS_EXPORT convert_stereo_i8_2float(unsigned long samples,
unsigned char *from, float *left, float *right);
void ARTS_EXPORT interpolate_stereo_i8_2float(unsigned long samples,
double startpos, double speed,
unsigned char *from, float *left, float *right);
void ARTS_EXPORT convert_stereo_i16le_2float(unsigned long samples,
unsigned char *from, float *left, float *right);
void ARTS_EXPORT interpolate_stereo_i16le_2float(unsigned long samples,
double startpos, double speed,
unsigned char *from, float *left, float *right);
void ARTS_EXPORT convert_stereo_i16be_2float(unsigned long samples,
unsigned char *from, float *left, float *right);
void ARTS_EXPORT interpolate_stereo_i16be_2float(unsigned long samples,
double startpos, double speed,
unsigned char *from, float *left, float *right);
void ARTS_EXPORT convert_mono_float_float(unsigned long samples,
float *from, float *to);
void ARTS_EXPORT interpolate_mono_float_float(unsigned long samples,
double startpos, double speed,
float *from, float *to);
void ARTS_EXPORT convert_stereo_ifloat_2float(unsigned long samples,
float *from, float *left, float *right);
void ARTS_EXPORT interpolate_stereo_ifloat_2float(unsigned long samples,
double startpos, double speed,
float *from, float *left, float *right);
// downconversions from float to integer
void ARTS_EXPORT convert_mono_float_16le(unsigned long samples,
float *from, unsigned char *to);
void ARTS_EXPORT convert_stereo_2float_i16le(unsigned long samples,
float *left, float *right, unsigned char *to);
void ARTS_EXPORT convert_mono_float_16be(unsigned long samples,
float *from, unsigned char *to);
void ARTS_EXPORT convert_stereo_2float_i16be(unsigned long samples,
float *left, float *right, unsigned char *to);
void ARTS_EXPORT convert_mono_float_8(unsigned long samples,
float *from, unsigned char *to);
void ARTS_EXPORT convert_stereo_2float_i8(unsigned long samples,
float *left, float *right, unsigned char *to);
/*
* This practical routine picks the right conversion routine for given
* parameters and makes boundary checks
*/
// returnvalue: number of samples generated
/* formats for unified conversion */
enum {
uni_convert_u8 = 8, // unsigned 8 bit
uni_convert_s16_le = 16, // signed 16 bit, little endian
uni_convert_s16_be = 17, // signed 16 bit, big endian
uni_convert_float_ne = 0x100 // float, in native size/byteorder
};
unsigned long ARTS_EXPORT uni_convert_stereo_2float(
unsigned long samples, // number of required samples
unsigned char *from, // buffer containing the samples
unsigned long fromLen, // length of the buffer
unsigned int fromChannels, // channels stored in the buffer
unsigned int fromBits, // number of bits per sample
// (also: uni_convert_ formats given above)
float *left, float *right, // output buffers for left and right channel
double speed, // speed (2.0 means twice as fast)
double startposition // startposition
);
}
#endif
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