kdatarequest_impl.cpp
/*
Copyright (C) 2002 Nikolas Zimmermann <wildfox@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <kdebug.h>
#include "flowsystem.h"
#include "convert.h"
#include "kdatarequest_impl.moc"
using namespace Arts;
KDataRequest_impl::KDataRequest_impl()
{
m_lastBlockSize = 0;
m_outBlock = 0;
}
KDataRequest_impl::~KDataRequest_impl()
{
delete []m_outBlock;
}
void KDataRequest_impl::streamInit()
{
}
void KDataRequest_impl::streamEnd()
{
}
void KDataRequest_impl::calculateBlock(unsigned long samples)
{
long blockSize = samples * 4;
if(m_lastBlockSize != blockSize)
{
delete []m_outBlock;
emit newBlockSize(blockSize);
m_outBlock = new unsigned char[blockSize]; // 2 channels, 16 bit
emit newBlockPointer((long) m_outBlock);
m_lastBlockSize = blockSize;
}
convert_stereo_2float_i16le(samples, left, right, m_outBlock);
emit newData();
}
/*
* this is the most tricky part here - since we will run in a context
* where no audio hardware will play the "give me more data role",
* we'll have to request things ourselves (requireFlow() tells the
* flowsystem that more signal flow should happen, so that
* calculateBlock will get called
*/
void KDataRequest_impl::goOn()
{
_node()->requireFlow();
}
REGISTER_IMPLEMENTATION(KDataRequest_impl);

KDE Home | KDE Accessibility Home | Description of Access Keys