diff options
Diffstat (limited to 'extern/audaspace/src/fx/BaseIIRFilterReader.cpp')
-rw-r--r-- | extern/audaspace/src/fx/BaseIIRFilterReader.cpp | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/extern/audaspace/src/fx/BaseIIRFilterReader.cpp b/extern/audaspace/src/fx/BaseIIRFilterReader.cpp new file mode 100644 index 00000000000..6505e5ea600 --- /dev/null +++ b/extern/audaspace/src/fx/BaseIIRFilterReader.cpp @@ -0,0 +1,125 @@ +/******************************************************************************* + * Copyright 2009-2016 Jörg Müller + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + ******************************************************************************/ + +#include "fx/BaseIIRFilterReader.h" + +#include <cstring> + +AUD_NAMESPACE_BEGIN + +BaseIIRFilterReader::BaseIIRFilterReader(std::shared_ptr<IReader> reader, int in, int out) : + EffectReader(reader), + m_specs(reader->getSpecs()), + m_xlen(in), m_ylen(out), + m_xpos(0), m_ypos(0), m_channel(0) +{ + m_x = new sample_t[m_xlen * m_specs.channels]; + m_y = new sample_t[m_ylen * m_specs.channels]; + + std::memset(m_x, 0, sizeof(sample_t) * m_xlen * m_specs.channels); + std::memset(m_y, 0, sizeof(sample_t) * m_ylen * m_specs.channels); +} + +BaseIIRFilterReader::~BaseIIRFilterReader() +{ + delete[] m_x; + delete[] m_y; +} + +void BaseIIRFilterReader::setLengths(int in, int out) +{ + if(in != m_xlen) + { + sample_t* xn = new sample_t[in * m_specs.channels]; + std::memset(xn, 0, sizeof(sample_t) * in * m_specs.channels); + + for(m_channel = 0; m_channel < m_specs.channels; m_channel++) + { + for(int i = 1; i <= in && i <= m_xlen; i++) + { + xn[(in - i) * m_specs.channels + m_channel] = x(-i); + } + } + + delete[] m_x; + m_x = xn; + m_xpos = 0; + m_xlen = in; + } + + if(out != m_ylen) + { + sample_t* yn = new sample_t[out * m_specs.channels]; + std::memset(yn, 0, sizeof(sample_t) * out * m_specs.channels); + + for(m_channel = 0; m_channel < m_specs.channels; m_channel++) + { + for(int i = 1; i <= out && i <= m_ylen; i++) + { + yn[(out - i) * m_specs.channels + m_channel] = y(-i); + } + } + + delete[] m_y; + m_y = yn; + m_ypos = 0; + m_ylen = out; + } +} + +void BaseIIRFilterReader::read(int& length, bool& eos, sample_t* buffer) +{ + Specs specs = m_reader->getSpecs(); + if(specs.channels != m_specs.channels) + { + m_specs.channels = specs.channels; + + delete[] m_x; + delete[] m_y; + + m_x = new sample_t[m_xlen * m_specs.channels]; + m_y = new sample_t[m_ylen * m_specs.channels]; + + std::memset(m_x, 0, sizeof(sample_t) * m_xlen * m_specs.channels); + std::memset(m_y, 0, sizeof(sample_t) * m_ylen * m_specs.channels); + } + + if(specs.rate != m_specs.rate) + { + m_specs = specs; + sampleRateChanged(m_specs.rate); + } + + m_reader->read(length, eos, buffer); + + for(m_channel = 0; m_channel < m_specs.channels; m_channel++) + { + for(int i = 0; i < length; i++) + { + m_x[m_xpos * m_specs.channels + m_channel] = buffer[i * m_specs.channels + m_channel]; + m_y[m_ypos * m_specs.channels + m_channel] = buffer[i * m_specs.channels + m_channel] = filter(); + + m_xpos = m_xlen ? (m_xpos + 1) % m_xlen : 0; + m_ypos = m_ylen ? (m_ypos + 1) % m_ylen : 0; + } + } +} + +void BaseIIRFilterReader::sampleRateChanged(SampleRate rate) +{ +} + +AUD_NAMESPACE_END |