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/BaseIIRFilterReader.h"
18
19 #include <cstring>
20
21 AUD_NAMESPACE_BEGIN
22
BaseIIRFilterReader(std::shared_ptr<IReader> reader,int in,int out)23 BaseIIRFilterReader::BaseIIRFilterReader(std::shared_ptr<IReader> reader, int in, int out) :
24 EffectReader(reader),
25 m_specs(reader->getSpecs()),
26 m_xlen(in), m_ylen(out),
27 m_xpos(0), m_ypos(0), m_channel(0)
28 {
29 m_x = new sample_t[m_xlen * m_specs.channels];
30 m_y = new sample_t[m_ylen * m_specs.channels];
31
32 std::memset(m_x, 0, sizeof(sample_t) * m_xlen * m_specs.channels);
33 std::memset(m_y, 0, sizeof(sample_t) * m_ylen * m_specs.channels);
34 }
35
~BaseIIRFilterReader()36 BaseIIRFilterReader::~BaseIIRFilterReader()
37 {
38 delete[] m_x;
39 delete[] m_y;
40 }
41
setLengths(int in,int out)42 void BaseIIRFilterReader::setLengths(int in, int out)
43 {
44 if(in != m_xlen)
45 {
46 sample_t* xn = new sample_t[in * m_specs.channels];
47 std::memset(xn, 0, sizeof(sample_t) * in * m_specs.channels);
48
49 for(m_channel = 0; m_channel < m_specs.channels; m_channel++)
50 {
51 for(int i = 1; i <= in && i <= m_xlen; i++)
52 {
53 xn[(in - i) * m_specs.channels + m_channel] = x(-i);
54 }
55 }
56
57 delete[] m_x;
58 m_x = xn;
59 m_xpos = 0;
60 m_xlen = in;
61 }
62
63 if(out != m_ylen)
64 {
65 sample_t* yn = new sample_t[out * m_specs.channels];
66 std::memset(yn, 0, sizeof(sample_t) * out * m_specs.channels);
67
68 for(m_channel = 0; m_channel < m_specs.channels; m_channel++)
69 {
70 for(int i = 1; i <= out && i <= m_ylen; i++)
71 {
72 yn[(out - i) * m_specs.channels + m_channel] = y(-i);
73 }
74 }
75
76 delete[] m_y;
77 m_y = yn;
78 m_ypos = 0;
79 m_ylen = out;
80 }
81 }
82
read(int & length,bool & eos,sample_t * buffer)83 void BaseIIRFilterReader::read(int& length, bool& eos, sample_t* buffer)
84 {
85 Specs specs = m_reader->getSpecs();
86 if(specs.channels != m_specs.channels)
87 {
88 m_specs.channels = specs.channels;
89
90 delete[] m_x;
91 delete[] m_y;
92
93 m_x = new sample_t[m_xlen * m_specs.channels];
94 m_y = new sample_t[m_ylen * m_specs.channels];
95
96 std::memset(m_x, 0, sizeof(sample_t) * m_xlen * m_specs.channels);
97 std::memset(m_y, 0, sizeof(sample_t) * m_ylen * m_specs.channels);
98 }
99
100 if(specs.rate != m_specs.rate)
101 {
102 m_specs = specs;
103 sampleRateChanged(m_specs.rate);
104 }
105
106 m_reader->read(length, eos, buffer);
107
108 for(m_channel = 0; m_channel < m_specs.channels; m_channel++)
109 {
110 for(int i = 0; i < length; i++)
111 {
112 m_x[m_xpos * m_specs.channels + m_channel] = buffer[i * m_specs.channels + m_channel];
113 m_y[m_ypos * m_specs.channels + m_channel] = buffer[i * m_specs.channels + m_channel] = filter();
114
115 m_xpos = m_xlen ? (m_xpos + 1) % m_xlen : 0;
116 m_ypos = m_ylen ? (m_ypos + 1) % m_ylen : 0;
117 }
118 }
119 }
120
sampleRateChanged(SampleRate rate)121 void BaseIIRFilterReader::sampleRateChanged(SampleRate rate)
122 {
123 }
124
125 AUD_NAMESPACE_END
126