1 /*******************************************************************************
2 * Copyright 2009-2016 Jörg Müller
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 ******************************************************************************/
16
17 #include "fx/Threshold.h"
18 #include "fx/CallbackIIRFilterReader.h"
19
20 AUD_NAMESPACE_BEGIN
21
thresholdFilter(CallbackIIRFilterReader * reader,float * threshold)22 sample_t Threshold::thresholdFilter(CallbackIIRFilterReader* reader, float* threshold)
23 {
24 float in = reader->x(0);
25 if(in >= *threshold)
26 return 1;
27 else if(in <= -*threshold)
28 return -1;
29 else
30 return 0;
31 }
32
endThresholdFilter(float * threshold)33 void Threshold::endThresholdFilter(float* threshold)
34 {
35 delete threshold;
36 }
37
Threshold(std::shared_ptr<ISound> sound,float threshold)38 Threshold::Threshold(std::shared_ptr<ISound> sound, float threshold) :
39 Effect(sound),
40 m_threshold(threshold)
41 {
42 }
43
getThreshold() const44 float Threshold::getThreshold() const
45 {
46 return m_threshold;
47 }
48
createReader()49 std::shared_ptr<IReader> Threshold::createReader()
50 {
51 return std::shared_ptr<IReader>(new CallbackIIRFilterReader(getReader(), 1, 0, doFilterIIR(thresholdFilter), endFilterIIR(endThresholdFilter), new float(m_threshold)));
52 }
53
54 AUD_NAMESPACE_END
55