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kdatarequest_impl.cpp
1  /*
2 
3  Copyright (C) 2002 Nikolas Zimmermann <wildfox@kde.org>
4 
5  This library is free software; you can redistribute it and/or
6  modify it under the terms of the GNU Library General Public
7  License as published by the Free Software Foundation; either
8  version 2 of the License, or (at your option) any later version.
9 
10  This library is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Library General Public License for more details.
14 
15  You should have received a copy of the GNU Library General Public License
16  along with this library; see the file COPYING.LIB. If not, write to
17  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18  Boston, MA 02110-1301, USA.
19 
20  */
21 
22 #include <kdebug.h>
23 #include "flowsystem.h"
24 #include "convert.h"
25 #include "kdatarequest_impl.moc"
26 
27 using namespace Arts;
28 
29 KDataRequest_impl::KDataRequest_impl()
30 {
31  m_lastBlockSize = 0;
32  m_outBlock = 0;
33 }
34 
35 KDataRequest_impl::~KDataRequest_impl()
36 {
37  delete []m_outBlock;
38 }
39 
40 void KDataRequest_impl::streamInit()
41 {
42 }
43 
44 void KDataRequest_impl::streamEnd()
45 {
46 }
47 
48 void KDataRequest_impl::calculateBlock(unsigned long samples)
49 {
50  long blockSize = samples * 4;
51 
52  if(m_lastBlockSize != blockSize)
53  {
54  delete []m_outBlock;
55  emit newBlockSize(blockSize);
56 
57  m_outBlock = new unsigned char[blockSize]; // 2 channels, 16 bit
58 
59  emit newBlockPointer((long) m_outBlock);
60 
61  m_lastBlockSize = blockSize;
62  }
63 
64  convert_stereo_2float_i16le(samples, left, right, m_outBlock);
65  emit newData();
66 }
67 
68 /*
69  * this is the most tricky part here - since we will run in a context
70  * where no audio hardware will play the "give me more data role",
71  * we'll have to request things ourselves (requireFlow() tells the
72  * flowsystem that more signal flow should happen, so that
73  * calculateBlock will get called
74  */
75 void KDataRequest_impl::goOn()
76 {
77  _node()->requireFlow();
78 }
79 
80 REGISTER_IMPLEMENTATION(KDataRequest_impl);

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