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81 lines
2.0 KiB
81 lines
2.0 KiB
15 years ago
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/*
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Copyright (C) 2002 Nikolas Zimmermann <wildfox@kde.org>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include <kdebug.h>
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#include "flowsystem.h"
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#include "convert.h"
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#include "kdatarequest_impl.moc"
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using namespace Arts;
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KDataRequest_impl::KDataRequest_impl()
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{
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m_lastBlockSize = 0;
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m_outBlock = 0;
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}
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KDataRequest_impl::~KDataRequest_impl()
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{
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delete []m_outBlock;
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}
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void KDataRequest_impl::streamInit()
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{
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}
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void KDataRequest_impl::streamEnd()
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{
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}
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void KDataRequest_impl::calculateBlock(unsigned long samples)
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{
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long blockSize = samples * 4;
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if(m_lastBlockSize != blockSize)
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{
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delete []m_outBlock;
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emit newBlockSize(blockSize);
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m_outBlock = new unsigned char[blockSize]; // 2 channels, 16 bit
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emit newBlockPointer((long) m_outBlock);
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m_lastBlockSize = blockSize;
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}
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convert_stereo_2float_i16le(samples, left, right, m_outBlock);
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emit newData();
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}
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/*
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* this is the most tricky part here - since we will run in a context
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* where no audio hardware will play the "give me more data role",
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* we'll have to request things ourselves (requireFlow() tells the
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* flowsystem that more signal flow should happen, so that
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* calculateBlock will get called
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*/
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void KDataRequest_impl::goOn()
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{
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_node()->requireFlow();
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}
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REGISTER_IMPLEMENTATION(KDataRequest_impl);
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