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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 Mixer.h
* @ingroup respec
* The Mixer class.
*/
#include "respec/Specification.h"
#include "respec/ConverterFunctions.h"
#include "util/Buffer.h"
#include <memory>
AUD_NAMESPACE_BEGIN
class IReader;
/**
* This abstract class is able to mix audiosignals with same channel count
* and sample rate and convert it to a specific output format.
*/
class AUD_API Mixer
{
private:
// delete copy constructor and operator=
Mixer(const Mixer&) = delete;
Mixer& operator=(const Mixer&) = delete;
protected:
/**
* The output specification.
*/
DeviceSpecs m_specs;
/**
* The length of the mixing buffer.
*/
int m_length;
/**
* The mixing buffer.
*/
Buffer m_buffer;
/**
* Converter function.
*/
convert_f m_convert;
public:
/**
* Creates the mixer.
*/
Mixer(DeviceSpecs specs);
/**
* Destroys the mixer.
*/
virtual ~Mixer() {}
/**
* Returns the target specification for superposing.
* \return The target specification.
*/
DeviceSpecs getSpecs() const;
/**
* Sets the target specification for superposing.
* \param specs The target specification.
*/
void setSpecs(Specs specs);
/**
* Mixes a buffer.
* \param buffer The buffer to superpose.
* \param start The start sample of the buffer.
* \param length The length of the buffer in samples.
* \param volume The mixing volume. Must be a value between 0.0 and 1.0.
*/
void mix(sample_t* buffer, int start, int length, float volume);
/**
* Mixes a buffer with linear volume interpolation.
* \param buffer The buffer to superpose.
* \param start The start sample of the buffer.
* \param length The length of the buffer in samples.
* \param volume_to The target mixing volume. Must be a value between 0.0 and 1.0.
* \param volume_from The start mixing volume. Must be a value between 0.0 and 1.0.
*/
void mix(sample_t* buffer, int start, int length, float volume_to, float volume_from);
/**
* Writes the mixing buffer into an output buffer.
* \param buffer The target buffer for superposing.
* \param volume The mixing volume. Must be a value between 0.0 and 1.0.
*/
void read(data_t* buffer, float volume);
/**
* Clears the mixing buffer.
* \param length The length of the buffer in samples.
*/
void clear(int length);
};
AUD_NAMESPACE_END
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