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Diffstat (limited to 'extern/audaspace/include/respec/JOSResampleReader.h')
-rw-r--r-- | extern/audaspace/include/respec/JOSResampleReader.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/extern/audaspace/include/respec/JOSResampleReader.h b/extern/audaspace/include/respec/JOSResampleReader.h new file mode 100644 index 00000000000..e9dd3b4220b --- /dev/null +++ b/extern/audaspace/include/respec/JOSResampleReader.h @@ -0,0 +1,129 @@ +/******************************************************************************* + * 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. + ******************************************************************************/ + +#pragma once + +/** + * @file JOSResampleReader.h + * @ingroup respec + * The JOSResampleReader class. + */ + +#include "respec/ResampleReader.h" +#include "util/Buffer.h" + +AUD_NAMESPACE_BEGIN + +/** + * This resampling reader uses Julius O. Smith's resampling algorithm. + */ +class AUD_API JOSResampleReader : public ResampleReader +{ +private: + typedef void (JOSResampleReader::*resample_f)(double target_factor, int length, sample_t* buffer); + + /** + * The half filter length. + */ + static const int m_len; + + /** + * The sample step size for the filter. + */ + static const int m_L; + + /** + * The filter coefficients. + */ + static const float m_coeff[]; + + /** + * The reader channels. + */ + Channels m_channels; + + /** + * The sample position in the cache. + */ + unsigned int m_n; + + /** + * The subsample position in the cache. + */ + double m_P; + + /** + * The input data buffer. + */ + Buffer m_buffer; + + /** + * Double buffer for the sums. + */ + Buffer m_sums; + + /** + * How many samples in the cache are valid. + */ + int m_cache_valid; + + /** + * Resample function. + */ + resample_f m_resample; + + /** + * Last resampling factor. + */ + double m_last_factor; + + // delete copy constructor and operator= + JOSResampleReader(const JOSResampleReader&) = delete; + JOSResampleReader& operator=(const JOSResampleReader&) = delete; + + /** + * Resets the resampler to its initial state. + */ + void AUD_LOCAL reset(); + + /** + * Updates the buffer to be as small as possible for the coming reading. + * \param size The size of samples to be read. + * \param factor The next resampling factor. + * \param samplesize The size of a sample. + */ + void AUD_LOCAL updateBuffer(int size, double factor, int samplesize); + + void AUD_LOCAL resample(double target_factor, int length, sample_t* buffer); + void AUD_LOCAL resample_mono(double target_factor, int length, sample_t* buffer); + void AUD_LOCAL resample_stereo(double target_factor, int length, sample_t* buffer); + +public: + /** + * Creates a resampling reader. + * \param reader The reader to mix. + * \param rate The target sampling rate. + */ + JOSResampleReader(std::shared_ptr<IReader> reader, SampleRate rate); + + virtual void seek(int position); + virtual int getLength() const; + virtual int getPosition() const; + virtual Specs getSpecs() const; + virtual void read(int& length, bool& eos, sample_t* buffer); +}; + +AUD_NAMESPACE_END |