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/***************************************************************************
Sample.h - definition of the sample type
-------------------
begin : Feb 09 2001
copyright : (C) 2001 by Thomas Eschenbacher
email : Thomas Eschenbacher <thomas.eschenbacher@gmx.de>
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef SAMPLE_H
#define SAMPLE_H
//***************************************************************************
#include <QtGlobal>
#include <limits>
/** use an unsigned integer for sample offset/count calculations */
typedef quint64 sample_index_t;
/** the highest possible sample index (currently limited to 32bit integer */
#define SAMPLE_INDEX_MAX (static_cast<sample_index_t>( \
std::numeric_limits<qint32>::max()) )
/**
* Currently a "sample" is defined as a 32 bit integer
* with 24 significant bits
*/
typedef qint32 sample_t;
/** native data type used for storing a sample_t */
typedef qint32 sample_storage_t;
/** number of significant bits per sample */
#define SAMPLE_BITS 24
/** number of bits used for storing samples in integer representation */
#define SAMPLE_STORAGE_BITS (sizeof(sample_storage_t) * 8)
/** lowest sample value */
#define SAMPLE_MIN (-(1 << (SAMPLE_BITS - 1)) + 1)
/** highest sample value */
#define SAMPLE_MAX (+(1 << (SAMPLE_BITS - 1)) - 1)
/**
* Simple conversion from float to sample_t
*/
static inline sample_t float2sample(const float f) {
return static_cast<sample_t>(
f * static_cast<float>(1 << (SAMPLE_BITS - 1)));
}
/**
* Simple conversion from sample_t to float
*/
static inline float sample2float(const sample_t s) {
return static_cast<float>(
static_cast<float>(s) / static_cast<float>(1 << (SAMPLE_BITS - 1)));
}
/**
* Simple conversion from sample_t to double
*/
static inline double sample2double(const sample_t s) {
return static_cast<double>(
static_cast<double>(s) / static_cast<double>(1 << (SAMPLE_BITS - 1)));
}
/**
* Simple conversion from double to sample_t
*/
static inline sample_t double2sample(const double f) {
return static_cast<sample_t>(
f * static_cast<double>(1 << (SAMPLE_BITS - 1)));
}
#endif /* SAMPLE_H */
//***************************************************************************
//***************************************************************************
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