arts Library API Documentation

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);
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This file is part of the documentation for arts Library Version 3.3.1.
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