Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/include/fx/TimeStretchPitchScaleReader.h

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+/*******************************************************************************
+ * Copyright 2009-2025 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 TimeStretchPitchScaleReader.h
+ * @ingroup fx
+ * The TimeStretchPitchScaleReader class.
+ */
+
+#include "TimeStretchPitchScale.h"
+
+#include "fx/EffectReader.h"
+#include "rubberband/RubberBandStretcher.h"
+#include "util/Buffer.h"
+
+using namespace RubberBand;
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This class reads from another reader and applies time-stretching and pitch scaling.
+ */
+class AUD_API TimeStretchPitchScaleReader : public EffectReader
+{
+private:
+	/**
+	 * The input buffer for the reader.
+	 */
+	Buffer m_buffer;
+
+	/**
+	 * The input/output deinterleaved buffers for each channel.
+	 */
+	std::vector<Buffer> m_deinterleaved;
+
+	/**
+	 * The pointers to the input/output deinterleaved buffer data for processing/retrieving.
+	 */
+	std::vector<sample_t*> m_channelData;
+
+	/**
+	 * Number of samples that need to be dropped at the beginning or after a seek.
+	 */
+	int m_samplesToDrop;
+
+	// delete copy constructor and operator=
+	TimeStretchPitchScaleReader(const TimeStretchPitchScaleReader&) = delete;
+	TimeStretchPitchScaleReader& operator=(const TimeStretchPitchScaleReader&) = delete;
+
+protected:
+	/**
+	 * Feeds the number of required zero samples to the stretcher and queries the amount of samples to drop.
+	 */
+	void reset();
+
+	/**
+	 * Rubberband stretcher.
+	 */
+	std::unique_ptr<RubberBandStretcher> m_stretcher;
+
+	/**
+	 * The current position.
+	 */
+	int m_position;
+
+	/**
+	 * Whether the reader has reached the end of stream.
+	 */
+	bool m_finishedReader;
+
+public:
+	/**
+	 * Creates a new stretcher reader.
+	 * \param reader The reader to read from.
+	 * \param timeRatio The factor by which to stretch or compress time.
+	 * \param pitchScale The factor by which to adjust the pitch.
+	 * \param quality The processing quality level of the stretcher.
+	 * \param preserveFormant Whether to preserve the vocal formants for the stretcher.
+	 */
+	TimeStretchPitchScaleReader(std::shared_ptr<IReader> reader, double timeRatio, double pitchScale, StretcherQuality quality, bool preserveFormant);
+
+	virtual void read(int& length, bool& eos, sample_t* buffer);
+
+	virtual void seek(int position);
+	virtual int getLength() const;
+	virtual int getPosition() const;
+
+	/**
+	 * Retrieves the current time ratio for the stretcher.
+	 * \return The current time ratio value.
+	 */
+	double getTimeRatio() const;
+
+	/**
+	 * Sets the time ratio for the stretcher.
+	 */
+	void setTimeRatio(double timeRatio);
+
+	/**
+	 * Retrieves the pitch scale for the stretcher.
+	 * \return The current pitch scale value.
+	 */
+	double getPitchScale() const;
+
+	/**
+	 * Sets the pitch scale for the stretcher.
+	 */
+	void setPitchScale(double pitchScale);
+};
+
+AUD_NAMESPACE_END