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/***************************************************************************
Mul.cpp - multiplier
-------------------
begin : Thu Nov 01 2007
copyright : (C) 2007 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 <QMutexLocker>
#include <QVariant>
#include "libkwave/Sample.h"
#include "libkwave/SampleArray.h"
#include "libkwave/modules/Mul.h"
/***************************************************************************/
Kwave::Mul::Mul()
:Kwave::SampleSource(),
m_queue_a(), m_queue_b(),
m_sem_a(0), m_sem_b(0),
m_a(), m_b(),
m_buffer_x(blockSize()),
m_a_is_const(false), m_b_is_const(false),
m_value_a(0), m_value_b(0),
m_lock()
{
}
/***************************************************************************/
Kwave::Mul::~Mul()
{
}
/***************************************************************************/
void Kwave::Mul::goOn()
{
}
/***************************************************************************/
void Kwave::Mul::multiply()
{
unsigned int count = blockSize();
float a = 0;
float b = 0;
const sample_t *p_a = nullptr;
const sample_t *p_b = nullptr;
sample_t *p_x = nullptr;
// get input A
if (!m_a_is_const) {
m_sem_a.acquire();
{
QMutexLocker lock(&m_lock);
m_a = m_queue_a.dequeue();
}
if (m_a.size() < count) count = m_a.size();
}
else
{
QMutexLocker lock(&m_lock);
a = m_value_a;
}
// get input B
if (!m_b_is_const) {
m_sem_b.acquire();
{
QMutexLocker lock(&m_lock);
m_b = m_queue_b.dequeue();
}
if (m_b.size() < count) count = m_b.size();
}
else
{
QMutexLocker lock(&m_lock);
b = m_value_b;
}
// check sizes of the buffers
if (!m_a_is_const && (count > m_a.size()))
count = m_a.size();
if (!m_b_is_const && (count > m_b.size()))
count = m_b.size();
// special handling for zero length input
if (!count) {
emit output(Kwave::SampleArray()); // emit zero length output
return; // and bail out
}
// if (!m_a_is_const && !m_b_is_const && (m_a.size() != m_b.size()))
// qWarning("Kwave::Mul: block sizes differ: %u x %u -> shrinked to %u",
// m_a.size(), m_b.size(), count);
bool ok = m_buffer_x.resize(count);
Q_ASSERT(ok);
Q_UNUSED(ok)
// get pointers to the buffer's raw data
p_a = m_a.constData();
p_b = m_b.constData();
p_x = m_buffer_x.data();
Q_ASSERT((m_a_is_const || p_a) && (m_b_is_const || p_b) && p_x);
if ((!m_a_is_const && !p_a) || (!m_b_is_const && !p_b) || !p_x)
return;
// do the multiplication of the whole buffer
for (; count; count--)
{
if (!m_a_is_const) { a = sample2float(*p_a); ++p_a; }
if (!m_b_is_const) { b = sample2float(*p_b); ++p_b; }
float y = a * b;
if (y > float( 1.0)) y = float( 1.0);
if (y < float(-1.0)) y = float(-1.0);
*(p_x++) = float2sample(y);
}
// emit the result
emit output(m_buffer_x);
}
/***************************************************************************/
void Kwave::Mul::input_a(Kwave::SampleArray data)
{
{
QMutexLocker lock(&m_lock);
m_queue_a.enqueue(data);
m_sem_a.release();
m_a_is_const = false;
}
if (m_b_is_const || !m_queue_b.isEmpty()) multiply();
}
/***************************************************************************/
void Kwave::Mul::input_b(Kwave::SampleArray data)
{
{
QMutexLocker lock(&m_lock);
m_queue_b.enqueue(data);
m_sem_b.release();
m_b_is_const = false;
}
if (m_a_is_const || !m_queue_a.isEmpty()) multiply();
}
/***************************************************************************/
void Kwave::Mul::set_a(const QVariant &a)
{
QMutexLocker lock(&m_lock);
m_value_a = QVariant(a).toFloat();
m_a_is_const = true;
}
/***************************************************************************/
void Kwave::Mul::set_b(const QVariant &b)
{
QMutexLocker lock(&m_lock);
m_value_b = QVariant(b).toFloat();
m_b_is_const = true;
}
/***************************************************************************/
/***************************************************************************/
#include "moc_Mul.cpp"
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