diff options
Diffstat (limited to 'extern/audaspace/src/generator/SawtoothReader.cpp')
-rw-r--r-- | extern/audaspace/src/generator/SawtoothReader.cpp | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/extern/audaspace/src/generator/SawtoothReader.cpp b/extern/audaspace/src/generator/SawtoothReader.cpp new file mode 100644 index 00000000000..3664b8d3b61 --- /dev/null +++ b/extern/audaspace/src/generator/SawtoothReader.cpp @@ -0,0 +1,83 @@ +/******************************************************************************* + * 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/SawtoothReader.h" + +#include <cmath> + +AUD_NAMESPACE_BEGIN + +SawtoothReader::SawtoothReader(float frequency, SampleRate sampleRate) : + m_frequency(frequency), + m_position(0), + m_sample(0), + m_sampleRate(sampleRate) +{ +} + +void SawtoothReader::setFrequency(float frequency) +{ + m_frequency = frequency; +} + +bool SawtoothReader::isSeekable() const +{ + return true; +} + +void SawtoothReader::seek(int position) +{ + m_position = position; + m_sample = std::fmod(m_position * m_frequency / (float)m_sampleRate + 1.0f, 2.0f) - 1.0f; +} + +int SawtoothReader::getLength() const +{ + return -1; +} + +int SawtoothReader::getPosition() const +{ + return m_position; +} + +Specs SawtoothReader::getSpecs() const +{ + Specs specs; + specs.rate = m_sampleRate; + specs.channels = CHANNELS_MONO; + return specs; +} + +void SawtoothReader::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] = m_sample; + } + + m_position += length; + eos = false; +} + +AUD_NAMESPACE_END |