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extern/audaspace/src/generator/TriangleReader.cpp
- This file was added.
| /******************************************************************************* | |||||
| * 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 "generator/TriangleReader.h" | |||||
| #include <cmath> | |||||
| AUD_NAMESPACE_BEGIN | |||||
| TriangleReader::TriangleReader(float frequency, SampleRate sampleRate) : | |||||
| m_frequency(frequency), | |||||
| m_position(0), | |||||
| m_sample(0.5f), | |||||
| m_sampleRate(sampleRate) | |||||
| { | |||||
| } | |||||
| void TriangleReader::setFrequency(float frequency) | |||||
| { | |||||
| m_frequency = frequency; | |||||
| } | |||||
| bool TriangleReader::isSeekable() const | |||||
| { | |||||
| return true; | |||||
| } | |||||
| void TriangleReader::seek(int position) | |||||
| { | |||||
| m_position = position; | |||||
| m_sample = std::fmod(m_position * m_frequency / (float)m_sampleRate + 1.5f, 2.0f) - 1.0f; | |||||
| } | |||||
| int TriangleReader::getLength() const | |||||
| { | |||||
| return -1; | |||||
| } | |||||
| int TriangleReader::getPosition() const | |||||
| { | |||||
| return m_position; | |||||
| } | |||||
| Specs TriangleReader::getSpecs() const | |||||
| { | |||||
| Specs specs; | |||||
| specs.rate = m_sampleRate; | |||||
| specs.channels = CHANNELS_MONO; | |||||
| return specs; | |||||
| } | |||||
| void TriangleReader::read(int& length, bool& eos, sample_t* buffer) | |||||
| { | |||||
| float k = 2.0 * m_frequency / m_sampleRate; | |||||
| for(int i = 0; i < length; i++) | |||||
| { | |||||
| m_sample += k; | |||||
| if(m_sample >= 1.0f) | |||||
| m_sample -= std::floor(m_sample) + 1.0f; | |||||
| buffer[i] = std::fabs(m_sample) * 2.0f - 1.0f; | |||||
| } | |||||
| m_position += length; | |||||
| eos = false; | |||||
| } | |||||
| AUD_NAMESPACE_END | |||||