Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/include/respec/JOSResampleReader.h

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+/*******************************************************************************
+ * 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 for HIGH quality setting. 
+	 */
+	static const int m_len_high;
+	/**
+	 * The half filter length for MEDIUM quality setting.
+	 */
+	static const int m_len_medium;
+	/**
+	 * The half filter length for LOW quality setting.
+	 */
+	static const int m_len_low;
+	/**
+	 * The filter sample step size for HIGH quality setting.
+	 */
+	static const int m_L_high;
+	/**
+	 * The filter sample step size for MEDIUM quality setting.
+	 */
+	static const int m_L_medium;
+	/**
+	 * The filter sample step size for LOW quality setting.
+	 */
+	static const int m_L_low;
+	/**
+	 * The filter coefficients for HIGH quality setting.
+	 */
+	static const float m_coeff_high[];
+	/**
+	 * The filter coefficients for MEDIUM quality setting.
+	 */
+	static const float m_coeff_medium[];
+	/**
+	 * The filter coefficients for LOW quality setting.
+	 */
+	static const float m_coeff_low[];
+
+	/**
+	 * The half filter length.
+	 */
+	int m_len;
+
+	/**
+	 * The sample step size for the filter.
+	 */
+	int m_L;
+
+	/**
+	 * The filter coefficients.
+	 */
+	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_generic(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);
+
+	template <typename T>
+	void AUD_LOCAL resample(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, ResampleQuality quality = ResampleQuality::HIGH);
+
+	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