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/Accumulator.h"
18 #include "fx/CallbackIIRFilterReader.h"
19
20 AUD_NAMESPACE_BEGIN
21
accumulatorFilterAdditive(CallbackIIRFilterReader * reader,void * useless)22 sample_t Accumulator::accumulatorFilterAdditive(CallbackIIRFilterReader* reader, void* useless)
23 {
24 float in = reader->x(0);
25 float lastin = reader->x(-1);
26 float out = reader->y(-1) + in - lastin;
27 if(in > lastin)
28 out += in - lastin;
29 return out;
30 }
31
accumulatorFilter(CallbackIIRFilterReader * reader,void * useless)32 sample_t Accumulator::accumulatorFilter(CallbackIIRFilterReader* reader, void* useless)
33 {
34 float in = reader->x(0);
35 float lastin = reader->x(-1);
36 float out = reader->y(-1);
37 if(in > lastin)
38 out += in - lastin;
39 return out;
40 }
41
Accumulator(std::shared_ptr<ISound> sound,bool additive)42 Accumulator::Accumulator(std::shared_ptr<ISound> sound,
43 bool additive) :
44 Effect(sound),
45 m_additive(additive)
46 {
47 }
48
createReader()49 std::shared_ptr<IReader> Accumulator::createReader()
50 {
51 return std::shared_ptr<IReader>(new CallbackIIRFilterReader(getReader(), 2, 2, m_additive ? accumulatorFilterAdditive : accumulatorFilter));
52 }
53
54 AUD_NAMESPACE_END
55