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#include "pcm_conv.h"
#include <stdlib.h>
#include <math.h>
/********************************************************
Audio Tools, a module and set of tools for manipulating audio data
Copyright (C) 2007-2015 Brian Langenberger
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*******************************************************/
#ifndef MIN
#define MIN(x, y) ((x) < (y) ? (x) : (y))
#endif
#ifndef MAX
#define MAX(x, y) ((x) > (y) ? (x) : (y))
#endif
/*******************************
* private function signatures *
*******************************/
#define PCM_CONV(name) \
static void \
pcm_##name##_to_int(unsigned total_samples, \
const unsigned char pcm_samples[], \
int int_samples[]); \
\
static void \
int_to_##name##_pcm(unsigned total_samples, \
const int int_samples[], \
unsigned char pcm_samples[]);
PCM_CONV(S8)
PCM_CONV(U8)
PCM_CONV(SB16)
PCM_CONV(SL16)
PCM_CONV(UB16)
PCM_CONV(UL16)
PCM_CONV(SB24)
PCM_CONV(SL24)
PCM_CONV(UB24)
PCM_CONV(UL24)
#define PCM_INT_CONV_DEFS(bits) \
static void \
int_##bits##_to_double(unsigned total_samples, \
const int int_samples[], \
double double_samples[]); \
\
static void \
int_##bits##_to_float(unsigned total_samples, \
const int int_samples[], \
float float_samples[]); \
\
static void \
double_to_##bits##_int(unsigned total_samples, \
const double double_samples[], \
int int_samples[]); \
\
static void \
float_to_##bits##_int(unsigned total_samples, \
const float float_samples[], \
int int_samples[]);
PCM_INT_CONV_DEFS(8)
PCM_INT_CONV_DEFS(16)
PCM_INT_CONV_DEFS(24)
/***********************************
* public function implementations *
***********************************/
pcm_to_int_f
pcm_to_int_converter(unsigned bits_per_sample,
int is_big_endian,
int is_signed)
{
switch (bits_per_sample) {
case 8:
if (is_signed) {
return pcm_S8_to_int;
} else {
return pcm_U8_to_int;
}
case 16:
if (is_signed) {
return is_big_endian ? pcm_SB16_to_int : pcm_SL16_to_int;
} else {
return is_big_endian ? pcm_UB16_to_int : pcm_UL16_to_int;
}
case 24:
if (is_signed) {
return is_big_endian ? pcm_SB24_to_int : pcm_SL24_to_int;
} else {
return is_big_endian ? pcm_UB24_to_int : pcm_UL24_to_int;
}
default:
return NULL;
}
}
int_to_pcm_f
int_to_pcm_converter(unsigned bits_per_sample,
int is_big_endian,
int is_signed)
{
switch (bits_per_sample) {
case 8:
if (is_signed) {
return int_to_S8_pcm;
} else {
return int_to_U8_pcm;
}
case 16:
if (is_signed) {
return is_big_endian ? int_to_SB16_pcm : int_to_SL16_pcm;
} else {
return is_big_endian ? int_to_UB16_pcm : int_to_UL16_pcm;
}
case 24:
if (is_signed) {
return is_big_endian ? int_to_SB24_pcm : int_to_SL24_pcm;
} else {
return is_big_endian ? int_to_UB24_pcm : int_to_UL24_pcm;
}
default:
return NULL;
}
}
int_to_double_f
int_to_double_converter(unsigned bits_per_sample)
{
switch (bits_per_sample) {
case 8:
return int_8_to_double;
case 16:
return int_16_to_double;
case 24:
return int_24_to_double;
default:
return NULL;
}
}
int_to_float_f
int_to_float_converter(unsigned bits_per_sample)
{
switch (bits_per_sample) {
case 8:
return int_8_to_float;
case 16:
return int_16_to_float;
case 24:
return int_24_to_float;
default:
return NULL;
}
}
double_to_int_f
double_to_int_converter(unsigned bits_per_sample)
{
switch (bits_per_sample) {
case 8:
return double_to_8_int;
case 16:
return double_to_16_int;
case 24:
return double_to_24_int;
default:
return NULL;
}
}
float_to_int_f
float_to_int_converter(unsigned bits_per_sample)
{
switch (bits_per_sample) {
case 8:
return float_to_8_int;
case 16:
return float_to_16_int;
case 24:
return float_to_24_int;
default:
return NULL;
}
}
/************************************
* private function implementations *
************************************/
static void
pcm_S8_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
if (pcm_samples[0] & 0x80) {
/*negative*/
int_samples[0] = -(int)(0x100 - pcm_samples[0]);
} else {
/*positive*/
int_samples[0] = (int)pcm_samples[0];
}
pcm_samples += 1;
int_samples += 1;
}
}
static void
int_to_S8_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
if (i > 0x7F)
i = 0x7F; /*avoid overflow*/
else if (i < -0x80)
i = -0x80; /*avoid underflow*/
if (int_samples[0] >= 0) {
/*positive*/
pcm_samples[0] = i;
} else {
/*negative*/
pcm_samples[0] = (1 << 8) - (-i);
}
int_samples += 1;
pcm_samples += 1;
}
}
static void
pcm_U8_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
int_samples[0] = ((int)pcm_samples[0]) - (1 << 7);
pcm_samples += 1;
int_samples += 1;
}
}
static void
int_to_U8_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
i += (1 << 7);
pcm_samples[0] = i & 0xFF;
int_samples += 1;
pcm_samples += 1;
}
}
static void
pcm_SB16_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
if (pcm_samples[0] & 0x80) {
/*negative*/
int_samples[0] =
-(int)(0x10000 - ((pcm_samples[0] << 8) | pcm_samples[1]));
} else {
/*positive*/
int_samples[0] =
(int)(pcm_samples[0] << 8) | pcm_samples[1];
}
pcm_samples += 2;
int_samples += 1;
}
}
static void
int_to_SB16_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
if (i > 0x7FFF)
i = 0x7FFF;
else if (i < -0x8000)
i = -0x8000;
if (i < 0) {
i = (1 << 16) - (-i);
}
pcm_samples[0] = i >> 8;
pcm_samples[1] = i & 0xFF;
int_samples += 1;
pcm_samples += 2;
}
}
static void
pcm_SL16_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
if (pcm_samples[1] & 0x80) {
/*negative*/
int_samples[0] =
-(int)(0x10000 - ((pcm_samples[1] << 8) | pcm_samples[0]));
} else {
/*positive*/
int_samples[0] =
(int)(pcm_samples[1] << 8) | pcm_samples[0];
}
pcm_samples += 2;
int_samples += 1;
}
}
static void
int_to_SL16_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
if (i > 0x7FFF)
i = 0x7FFF;
else if (i < -0x8000)
i = -0x8000;
if (i < 0) {
i = (1 << 16) - (-i);
}
pcm_samples[1] = i >> 8;
pcm_samples[0] = i & 0xFF;
int_samples += 1;
pcm_samples += 2;
}
}
static void
pcm_UB16_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
int_samples[0] =
((int)(pcm_samples[0] << 8) | pcm_samples[1]) - (1 << 15);
pcm_samples += 2;
int_samples += 1;
}
}
static void
int_to_UB16_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
i += (1 << 15);
pcm_samples[0] = (i >> 8) & 0xFF;
pcm_samples[1] = i & 0xFF;
int_samples += 1;
pcm_samples += 2;
}
}
static void
pcm_UL16_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
int_samples[0] =
((int)(pcm_samples[1] << 8) | pcm_samples[0]) - (1 << 15);
pcm_samples += 2;
int_samples += 1;
}
}
static void
int_to_UL16_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
i += (1 << 15);
pcm_samples[1] = (i >> 8) & 0xFF;
pcm_samples[0] = i & 0xFF;
int_samples += 1;
pcm_samples += 2;
}
}
static void
pcm_SB24_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
if (pcm_samples[0] & 0x80) {
/*negative*/
int_samples[0] =
-(int)(0x1000000 - ((pcm_samples[0] << 16) |
(pcm_samples[1] << 8) |
pcm_samples[2]));
} else {
/*positive*/
int_samples[0] =
(int)((pcm_samples[0] << 16) |
(pcm_samples[1] << 8) |
pcm_samples[2]);
}
pcm_samples += 3;
int_samples += 1;
}
}
static void
int_to_SB24_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
if (i > 0x7FFFFF)
i = 0x7FFFFF;
else if (i < -0x800000)
i = -0x800000;
if (i < 0) {
i = (1 << 24) - (-i);
}
pcm_samples[0] = i >> 16;
pcm_samples[1] = (i >> 8) & 0xFF;
pcm_samples[2] = i & 0xFF;
int_samples += 1;
pcm_samples += 3;
}
}
static void
pcm_SL24_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
if (pcm_samples[2] & 0x80) {
/*negative*/
int_samples[0] =
-(int)(0x1000000 - ((pcm_samples[2] << 16) |
(pcm_samples[1] << 8) |
pcm_samples[0]));
} else {
/*positive*/
int_samples[0] =
(int)((pcm_samples[2] << 16) |
(pcm_samples[1] << 8) |
pcm_samples[0]);
}
pcm_samples += 3;
int_samples += 1;
}
}
static void
int_to_SL24_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
if (i > 0x7FFFFF)
i = 0x7FFFFF;
else if (i < -0x800000)
i = -0x800000;
if (i < 0) {
i = (1 << 24) - (-i);
}
pcm_samples[2] = i >> 16;
pcm_samples[1] = (i >> 8) & 0xFF;
pcm_samples[0] = i & 0xFF;
int_samples += 1;
pcm_samples += 3;
}
}
static void
pcm_UB24_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
int_samples[0] =
((int)((pcm_samples[0] << 16) |
(pcm_samples[1] << 8) |
pcm_samples[2])) - (1 << 23);
pcm_samples += 3;
int_samples += 1;
}
}
static void
int_to_UB24_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
i += (1 << 23);
pcm_samples[0] = (i >> 16) & 0xFF;
pcm_samples[1] = (i >> 8) & 0xFF;
pcm_samples[2] = i & 0xFF;
int_samples += 1;
pcm_samples += 3;
}
}
static void
pcm_UL24_to_int(unsigned total_samples,
const unsigned char pcm_samples[],
int int_samples[])
{
for (; total_samples; total_samples--) {
int_samples[0] = ((int)((pcm_samples[2] << 16) |
(pcm_samples[1] << 8) |
pcm_samples[0])) - (1 << 23);
pcm_samples += 3;
int_samples += 1;
}
}
static void
int_to_UL24_pcm(unsigned total_samples,
const int int_samples[],
unsigned char pcm_samples[])
{
for (; total_samples; total_samples--) {
register int i = int_samples[0];
i += (1 << 23);
pcm_samples[2] = (i >> 16) & 0xFF;
pcm_samples[1] = (i >> 8) & 0xFF;
pcm_samples[0] = i & 0xFF;
int_samples += 1;
pcm_samples += 3;
}
}
#include <stdio.h>
#define PCM_INT_CONV(BITS, NEGATIVE_MIN, POSITIVE_MAX) \
static void \
int_##BITS##_to_double(unsigned total_samples, \
const int int_samples[], \
double double_samples[]) \
{ \
for (; total_samples; total_samples--) { \
const register int i = int_samples[0]; \
if (i >= 0) { \
double_samples[0] = (double)i / POSITIVE_MAX; \
} else { \
double_samples[0] = (double)i / -(NEGATIVE_MIN); \
} \
int_samples += 1; \
double_samples += 1; \
} \
} \
\
static void \
int_##BITS##_to_float(unsigned total_samples, \
const int int_samples[], \
float float_samples[]) \
{ \
for (; total_samples; total_samples--) { \
const register int i = int_samples[0]; \
if (i >= 0) { \
float_samples[0] = (float)i / POSITIVE_MAX; \
} else { \
float_samples[0] = (float)i / -(NEGATIVE_MIN); \
} \
int_samples += 1; \
float_samples += 1; \
} \
} \
\
static void \
double_to_##BITS##_int(unsigned total_samples, \
const double double_samples[], \
int int_samples[]) \
{ \
for (; total_samples; total_samples--) { \
const register double d = double_samples[0]; \
const int value = \
d * (signbit(d) ? -(NEGATIVE_MIN) : POSITIVE_MAX); \
int_samples[0] = MIN(MAX(value, NEGATIVE_MIN), POSITIVE_MAX); \
double_samples += 1; \
int_samples += 1; \
} \
} \
\
static void \
float_to_##BITS##_int(unsigned total_samples, \
const float float_samples[], \
int int_samples[]) \
{ \
for (; total_samples; total_samples--) { \
const register double d = float_samples[0]; \
const int value = \
d * (signbit(d) ? -(NEGATIVE_MIN) : POSITIVE_MAX); \
int_samples[0] = MIN(MAX(value, NEGATIVE_MIN), POSITIVE_MAX); \
float_samples += 1; \
int_samples += 1; \
} \
}
PCM_INT_CONV(8, -128, 127)
PCM_INT_CONV(16, -32768, 32767)
PCM_INT_CONV(24, -8388608, 8388607)
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