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/*************************************************************************
SampleBuffer.cpp - simple buffer for sample arrays
-------------------
begin : Sun Oct 17 2010
copyright : (C) 2010 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 <QFuture>
#include <QtConcurrentRun>
#include "libkwave/Utils.h"
#include "libkwave/modules/SampleBuffer.h"
//***************************************************************************
//***************************************************************************
Kwave::SampleBuffer::SampleBuffer(QObject *parent)
:Kwave::SampleSink(parent),
m_data(), m_offset(0), m_buffered(0), m_sema(1)
{
}
//***************************************************************************
Kwave::SampleBuffer::~SampleBuffer()
{
m_sema.acquire();
}
//***************************************************************************
bool Kwave::SampleBuffer::isEmpty() const
{
return m_data.isEmpty();
}
//***************************************************************************
Kwave::SampleArray &Kwave::SampleBuffer::data()
{
return m_data;
}
//***************************************************************************
const Kwave::SampleArray &Kwave::SampleBuffer::constData() const
{
return m_data;
}
//***************************************************************************
unsigned int Kwave::SampleBuffer::available() const
{
unsigned int size = m_data.size();
return (size > m_offset) ? (size - m_offset) : 0;
}
//***************************************************************************
const sample_t *Kwave::SampleBuffer::get(unsigned int len)
{
const unsigned int size = m_data.size();
if (m_offset > size) return nullptr; // already reached EOF
// limit read length to the size of the buffer
if (len > size) len = size;
// get a pointer to the raw data
const sample_t *raw = m_data.constData() + m_offset;
// advance the offset
m_offset += len;
return raw;
}
//***************************************************************************
void Kwave::SampleBuffer::put(sample_t sample)
{
const unsigned int block_size = Kwave::StreamObject::blockSize();
if (m_buffered >= block_size) finished();
// initial fill of the buffer?
bool ok = m_data.resize(block_size);
Q_ASSERT(ok);
Q_UNUSED(ok)
m_data[m_buffered++] = sample;
if (m_buffered >= block_size) finished();
}
//***************************************************************************
void Kwave::SampleBuffer::finished()
{
bool ok = true;
if (m_buffered && (m_data.size() != m_buffered))
ok &= m_data.resize(m_buffered);
enqueue(m_data);
m_buffered = 0;
ok &= m_data.resize(Kwave::StreamObject::blockSize());
Q_ASSERT(ok);
}
//***************************************************************************
void Kwave::SampleBuffer::input(Kwave::SampleArray data)
{
// if we have buffered data, flush that first
if (m_buffered) {
bool ok = m_data.resize(m_buffered);
Q_ASSERT(ok);
Q_UNUSED(ok)
m_buffered = 0;
enqueue(m_data);
}
// take over the input array directly
m_data = data;
m_offset = 0;
m_buffered = data.size();
}
//***************************************************************************
void Kwave::SampleBuffer::enqueue(Kwave::SampleArray data)
{
m_sema.acquire();
auto discard = QtConcurrent::run(&Kwave::SampleBuffer::emitData, this, data);
}
//***************************************************************************
void Kwave::SampleBuffer::emitData(Kwave::SampleArray data)
{
// NOTE: this signal could be connected to a slot that blocks for a while
emit output(data);
m_sema.release();
}
//***************************************************************************
//***************************************************************************
#include "moc_SampleBuffer.cpp"
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