arts Library: kdatarequest_impl.cpp Source File (arts Library)

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# kdatarequest_impl.cpp

    00001     /*
    00002
    00003     Copyright (C) 2002 Nikolas Zimmermann <wildfox@kde.org>
    00004
    00005     This library is free software; you can redistribute it and/or
    00006     modify it under the terms of the GNU Library General Public
    00007     License as published by the Free Software Foundation; either
    00008     version 2 of the License, or (at your option) any later version.
    00009
    00010     This library is distributed in the hope that it will be useful,
    00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013     Library General Public License for more details.
    00014
    00015     You should have received a copy of the GNU Library General Public License
    00016     along with this library; see the file COPYING.LIB.  If not, write to
    00017     the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00018     Boston, MA 02111-1307, USA.
    00019
    00020     */
    00021
    00022 #include <kdebug.h>
    00023 #include "flowsystem.h"
    00024 #include "convert.h"
    00025 #include "kdatarequest_impl.moc"
    00026
    00027 using namespace Arts;
    00028
    00029 KDataRequest_impl::KDataRequest_impl()
    00030 {
    00031     m_lastBlockSize = 0;
    00032     m_outBlock = 0;
    00033 }
    00034
    00035 KDataRequest_impl::~KDataRequest_impl()
    00036 {
    00037     delete []m_outBlock;
    00038 }
    00039
    00040 void KDataRequest_impl::streamInit()
    00041 {
    00042 }
    00043
    00044 void KDataRequest_impl::streamEnd()
    00045 {
    00046 }
    00047
    00048 void KDataRequest_impl::calculateBlock(unsigned long samples)
    00049 {
    00050     long blockSize = samples * 4;
    00051
    00052     if(m_lastBlockSize != blockSize)
    00053     {
    00054         delete []m_outBlock;
    00055         emit newBlockSize(blockSize);
    00056
    00057         m_outBlock = new unsigned char[blockSize]; // 2 channels, 16 bit
    00058
    00059         emit newBlockPointer((long) m_outBlock);
    00060
    00061         m_lastBlockSize = blockSize;
    00062     }
    00063
    00064     convert_stereo_2float_i16le(samples, left, right, m_outBlock);
    00065     emit newData();
    00066 }
    00067
    00068 /*
    00069  * this is the most tricky part here - since we will run in a context
    00070  * where no audio hardware will play the "give me more data role",
    00071  * we'll have to request things ourselves (requireFlow() tells the
    00072  * flowsystem that more signal flow should happen, so that
    00073  * calculateBlock will get called
    00074  */
    00075 void KDataRequest_impl::goOn()
    00076 {
    00077     _node()->requireFlow();
    00078 }
    00079
    00080 REGISTER_IMPLEMENTATION(KDataRequest_impl);

This file is part of the documentation for arts Library Version 3.4.1.
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