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/*************************************************************************
SampleArray.cpp - array with Kwave's internal sample_t
-------------------
begin : Wed Jan 02 2008
copyright : (C) 2008 by Thomas Eschenbacher
email : 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. *
* *
***************************************************************************/
#include "config.h"
#include <new>
#include <stdlib.h>
#include "libkwave/SampleArray.h"
#include "libkwave/memcpy.h"
//***************************************************************************
Kwave::SampleArray::SampleArray()
{
m_storage = new(std::nothrow) SampleStorage;
}
//***************************************************************************
Kwave::SampleArray::SampleArray(unsigned int size)
{
m_storage = new(std::nothrow) SampleStorage;
bool ok = resize(size);
if (!ok)
qWarning("Kwave::SampleArray::SampleArray(%u) - FAILED, OOM?", size);
}
//***************************************************************************
Kwave::SampleArray::~SampleArray()
{
}
//***************************************************************************
void Kwave::SampleArray::fill(sample_t value)
{
if (!m_storage) return;
sample_t *p = data();
Q_ASSERT(p);
if (!p) return;
for (unsigned int count = m_storage->m_size; Q_LIKELY(count); count--) {
*p = value;
p++;
}
}
//***************************************************************************
sample_t & Kwave::SampleArray::operator [] (unsigned int index)
{
static sample_t dummy = 0;
sample_t *p = data();
if (Q_LIKELY(p))
return (*(p + index));
else
return dummy;
}
//***************************************************************************
const sample_t & Kwave::SampleArray::operator [] (unsigned int index) const
{
static const sample_t dummy = 0;
const sample_t *p = constData();
if (Q_LIKELY(p))
return (*(p + index));
else
return dummy;
}
//***************************************************************************
bool Kwave::SampleArray::resize(unsigned int size)
{
if (!m_storage) return false;
if (size == m_storage->m_size) return true;
m_storage->resize(size);
if (size && (m_storage->m_size > size)) {
qWarning("Kwave::SampleArray::resize(): shrinking from %u to %u "
"failed, keeping old memory", m_storage->m_size, size);
return true;
}
return (m_storage->m_size == size);
}
//***************************************************************************
unsigned int Kwave::SampleArray::size() const
{
return (m_storage) ? m_storage->m_size : 0;
}
//***************************************************************************
Kwave::SampleArray::SampleStorage::SampleStorage()
:QSharedData()
{
m_size = 0;
m_data = nullptr;
}
//***************************************************************************
Kwave::SampleArray::SampleStorage::SampleStorage(const SampleStorage &other)
:QSharedData(other)
{
m_size = 0;
m_data = nullptr;
if (other.m_size) {
m_data = static_cast<sample_t *>(
::malloc(other.m_size * sizeof(sample_t))
);
if (m_data) {
m_size = other.m_size;
MEMCPY(m_data, other.m_data, m_size * sizeof(sample_t));
}
}
}
//***************************************************************************
Kwave::SampleArray::SampleStorage::~SampleStorage()
{
if (m_data) ::free(m_data);
}
//***************************************************************************
void Kwave::SampleArray::SampleStorage::resize(unsigned int size)
{
if (size) {
// resize using realloc, keep existing data
sample_t *new_data = static_cast<sample_t *>(
::realloc(m_data, size * sizeof(sample_t)));
if (new_data) {
// successful
m_data = new_data;
if (size > m_size) {
// initialize the new data
unsigned int count = size - m_size;
sample_t *p = m_data + m_size;
while (count--)
*(p++) = 0;
}
m_size = size;
} else {
qWarning("Kwave::SampleArray::SampleStorage::resize(%u): OOM! "
"- keeping old size %u", size, m_size);
}
} else {
// resize to zero == delete/free memory
Q_ASSERT(m_data);
sample_t *t = m_data;
m_data = nullptr;
m_size = 0;
::free(t);
}
}
//***************************************************************************
//***************************************************************************
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