diff options
Diffstat (limited to 'extern/audaspace/src/fx/FaderReader.cpp')
-rw-r--r-- | extern/audaspace/src/fx/FaderReader.cpp | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/extern/audaspace/src/fx/FaderReader.cpp b/extern/audaspace/src/fx/FaderReader.cpp new file mode 100644 index 00000000000..b1e23b993f3 --- /dev/null +++ b/extern/audaspace/src/fx/FaderReader.cpp @@ -0,0 +1,76 @@ +/******************************************************************************* + * 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/FaderReader.h" + +#include <cstring> + +AUD_NAMESPACE_BEGIN + +FaderReader::FaderReader(std::shared_ptr<IReader> reader, FadeType type, float start,float length) : + EffectReader(reader), + m_type(type), + m_start(start), + m_length(length) +{ +} + +void FaderReader::read(int& length, bool& eos, sample_t* buffer) +{ + int position = m_reader->getPosition(); + Specs specs = m_reader->getSpecs(); + int samplesize = AUD_SAMPLE_SIZE(specs); + + m_reader->read(length, eos, buffer); + + if((position + length) / (float)specs.rate <= m_start) + { + if(m_type != FADE_OUT) + { + std::memset(buffer, 0, length * samplesize); + } + } + else if(position / (float)specs.rate >= m_start+m_length) + { + if(m_type == FADE_OUT) + { + std::memset(buffer, 0, length * samplesize); + } + } + else + { + float volume = 1.0f; + + for(int i = 0; i < length * specs.channels; i++) + { + if(i % specs.channels == 0) + { + volume = (((position+i)/(float)specs.rate)-m_start) / m_length; + if(volume > 1.0f) + volume = 1.0f; + else if(volume < 0.0f) + volume = 0.0f; + + if(m_type == FADE_OUT) + volume = 1.0f - volume; + } + + buffer[i] = buffer[i] * volume; + } + } +} + +AUD_NAMESPACE_END |