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//resampler_poly3.c:
/*
* Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2014
* Copyright (C) Hans-Kristian 'maister' Arntzen - 2010
*
* This file is part of libroar a part of RoarAudio,
* a cross-platform sound system for both, home and professional use.
* See README for details.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3
* as published by the Free Software Foundation.
*
* libroar 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* NOTE for everyone want's to change something and send patches:
* read README and HACKING! There a addition information on
* the license of this document you need to read before you send
* any patches.
*
* NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
* or libpulse*:
* The libs libroaresd, libroararts and libroarpulse link this lib
* and are therefore GPL. Because of this it may be illigal to use
* them with any software that uses libesd, libartsc or libpulse*.
*/
#include "libroardsp.h"
int roar_conv_poly3_8 (int8_t * out, int8_t * in, size_t olen, size_t ilen, int channels) {
float ratio = (float)olen / (float)ilen;
int8_t *ip;
int c, x;
float pos_in;
float poly[3];
float y[3];
float x_val;
int_least16_t temp;
/* Can't create poly out of less than 3 samples in each channel. */
if ( ilen < 3 * channels )
return -1;
ip = roar_mm_malloc(ilen * sizeof(int8_t));
if ( ip == NULL )
return -1;
memcpy(ip, in, ilen * sizeof(int8_t));
olen /= channels;
for (x = 0; x < olen; x++) {
for (c = 0; c < channels; c++) {
pos_in = (float)x / ratio;
if ( (int)pos_in == 0 ) {
y[0] = ip[0 * channels + c];
y[1] = ip[1 * channels + c];
y[2] = ip[2 * channels + c];
x_val = pos_in;
roar_math_mkpoly_3x3(poly, y);
} else if ( (int)pos_in + 1 >= ilen/channels ) {
/* If we're at the end of the block, we will need to interpolate against a value that is not yet known.
* We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */
y[0] = ip[((int)pos_in - 1) * channels + c];
y[1] = ip[((int)pos_in ) * channels + c];
// we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly
roar_math_mkpoly_2x2(poly, y);
poly[2] = 0;
x_val = pos_in - (int)pos_in + 1.0;
} else {
y[0] = ip[((int)pos_in - 1) * channels + c];
y[1] = ip[((int)pos_in ) * channels + c];
y[2] = ip[((int)pos_in + 1) * channels + c];
x_val = pos_in - (int)pos_in + 1.0;
roar_math_mkpoly_3x3(poly, y);
}
temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5);
/* temp could be out of bounds, so need to check this */
if ( temp > 0x7E ) {
out[x * channels + c] = 0x7E;
} else if (temp < -0x7F) {
out[x * channels + c] = -0x7F;
} else {
out[x * channels + c] = (int8_t)temp;
}
}
}
roar_mm_free(ip);
return 0;
}
int roar_conv_poly3_16 (int16_t * out, int16_t * in, size_t olen, size_t ilen, int channels) {
float ratio = (float)olen / (float)ilen;
int16_t *ip;
int c, x;
float pos_in;
float poly[3];
float y[3];
float x_val;
int_least32_t temp;
/* Can't create poly out of less than 3 samples in each channel. */
if ( ilen < 3 * channels )
return -1;
ip = roar_mm_malloc(ilen * sizeof(int16_t));
if ( ip == NULL )
return -1;
memcpy(ip, in, ilen * sizeof(int16_t));
olen /= channels;
for (x = 0; x < olen; x++) {
for (c = 0; c < channels; c++) {
pos_in = (float)x / ratio;
if ( (int)pos_in == 0 ) {
y[0] = ip[0 * channels + c];
y[1] = ip[1 * channels + c];
y[2] = ip[2 * channels + c];
x_val = pos_in;
roar_math_mkpoly_3x3(poly, y);
} else if ( (int)pos_in + 1 >= ilen/channels ) {
/* If we're at the end of the block, we will need to interpolate against a value that is not yet known.
* We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */
y[0] = ip[((int)pos_in - 1) * channels + c];
y[1] = ip[((int)pos_in ) * channels + c];
// we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly
roar_math_mkpoly_2x2(poly, y);
poly[2] = 0;
x_val = pos_in - (int)pos_in + 1.0;
} else {
y[0] = ip[((int)pos_in - 1) * channels + c];
y[1] = ip[((int)pos_in ) * channels + c];
y[2] = ip[((int)pos_in + 1) * channels + c];
x_val = pos_in - (int)pos_in + 1.0;
roar_math_mkpoly_3x3(poly, y);
}
temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5);
/* temp could be out of bounds, so need to check this */
if (temp > 0x7FFE ) {
out[x * channels + c] = 0x7FFE;
} else if (temp < -0x7FFF) {
out[x * channels + c] = -0x7FFF;
} else {
out[x * channels + c] = (int16_t)temp;
}
}
}
roar_mm_free(ip);
return 0;
}
int roar_conv_poly3_32 (int32_t * out, int32_t * in, size_t olen, size_t ilen, int channels) {
float ratio = (float)olen / (float)ilen;
int32_t *ip;
int c, x;
float pos_in;
float poly[3];
float y[3];
float x_val;
int_least64_t temp;
/* Can't create poly out of less than 3 samples in each channel. */
if ( ilen < 3 * channels )
return -1;
ip = roar_mm_malloc(ilen * sizeof(int32_t));
if ( ip == NULL )
return -1;
memcpy(ip, in, ilen * sizeof(int32_t));
olen /= channels;
for (x = 0; x < olen; x++) {
for (c = 0; c < channels; c++) {
pos_in = (float)x / ratio;
if ( (int)pos_in == 0 ) {
y[0] = ip[0 * channels + c];
y[1] = ip[1 * channels + c];
y[2] = ip[2 * channels + c];
x_val = pos_in;
roar_math_mkpoly_3x3(poly, y);
} else if ( (int)pos_in + 1 >= ilen/channels ) {
/* If we're at the end of the block, we will need to interpolate against a value that is not yet known.
* We will assume this value, by linearly extrapolating the two preceding values. From causual testing, this is not audible. */
y[0] = ip[((int)pos_in - 1) * channels + c];
y[1] = ip[((int)pos_in ) * channels + c];
// we create a 2x2 poly here and set the 3rd coefficient to zero to build a 3x3 poly
roar_math_mkpoly_2x2(poly, y);
poly[2] = 0;
x_val = pos_in - (int)pos_in + 1.0;
} else {
y[0] = ip[((int)pos_in - 1) * channels + c];
y[1] = ip[((int)pos_in ) * channels + c];
y[2] = ip[((int)pos_in + 1) * channels + c];
x_val = pos_in - (int)pos_in + 1.0;
roar_math_mkpoly_3x3(poly, y);
}
temp = (float)(poly[2]*x_val*x_val + poly[1]*x_val + poly[0] + 0.5);
/* temp could be out of bounds, so need to check this */
if ( temp > 0x7FFFFFFE ) {
out[x * channels + c] = 0x7FFFFFFE;
} else if (temp < -0x7FFFFFFF) {
out[x * channels + c] = -0x7FFFFFFF;
} else {
out[x * channels + c] = (int32_t)temp;
}
}
}
roar_mm_free(ip);
return 0;
}
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