/usr/include/svxlink/AsyncAudioProcessor.h is in libasyncaudio-dev 17.12.1-2.
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@file AsyncAudioProcessor.h
@brief The base class for an audio processor class
@author Tobias Blomberg / SM0SVX
@date 2006-04-23
\verbatim
Async - A library for programming event driven applications
Copyright (C) 2003-2008 Tobias Blomberg / SM0SVX
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
\endverbatim
*/
#ifndef ASYNC_AUDIO_PROCESSOR_INCLUDED
#define ASYNC_AUDIO_PROCESSOR_INCLUDED
/****************************************************************************
*
* System Includes
*
****************************************************************************/
#include <sigc++/sigc++.h>
#include <string>
/****************************************************************************
*
* Project Includes
*
****************************************************************************/
/****************************************************************************
*
* Local Includes
*
****************************************************************************/
#include <AsyncAudioSource.h>
#include <AsyncAudioSink.h>
/****************************************************************************
*
* Forward declarations
*
****************************************************************************/
/****************************************************************************
*
* Namespace
*
****************************************************************************/
namespace Async
{
/****************************************************************************
*
* Forward declarations of classes inside of the declared namespace
*
****************************************************************************/
/****************************************************************************
*
* Defines & typedefs
*
****************************************************************************/
/****************************************************************************
*
* Exported Global Variables
*
****************************************************************************/
/****************************************************************************
*
* Class definitions
*
****************************************************************************/
/**
@brief The base class for an audio processor
@author Tobias Blomberg / SM0SVX
@date 2006-04-23
This class is the base class for an audio processor. An audio processor is
a class that is both an audio sink and source. It receives samples, process
them in some way and send them further down the chain.
*/
class AudioProcessor : public AudioSink, public AudioSource, public sigc::trackable
{
public:
/**
* @brief Default constuctor
*/
AudioProcessor(void);
/**
* @brief Destructor
*/
virtual ~AudioProcessor(void);
/**
* @brief Write audio to the filter
* @param samples The buffer containing the samples
* @param len The number of samples in the buffer
* @return Return the number of samples processed
*/
int writeSamples(const float *samples, int len);
/**
* @brief Order a flush of all samples
*/
void flushSamples(void);
/**
* @brief Resume output to the sink if previously stopped
*/
void resumeOutput(void);
/**
* @brief All samples have been flushed by the sink
*/
void allSamplesFlushed(void);
protected:
/**
* @brief Set the input and output sample rates
* @param input_rate The input sample rate
* @param output_rate The output sample rate
*/
void setInputOutputSampleRate(int input_rate, int output_rate);
/**
* @brief Process incoming samples and put them into the output buffer
* @param dest Destination buffer
* @param src Source buffer
* @param count Number of samples in the source buffer
*
* This function should be reimplemented by the inheriting class to
* do the actual processing of the incoming samples. All samples must
* be processed, otherwise they are lost and the output buffer will
* contain garbage.
*/
virtual void processSamples(float *dest, const float *src, int count) = 0;
private:
static const int BUFSIZE = 256;
float buf[BUFSIZE];
int buf_cnt;
bool do_flush;
bool input_stopped;
bool output_stopped;
int input_rate;
int output_rate;
float *input_buf;
int input_buf_cnt;
int input_buf_size;
AudioProcessor(const AudioProcessor&);
AudioProcessor& operator=(const AudioProcessor&);
void writeFromBuf(void);
}; /* class AudioProcessor */
} /* namespace */
#endif /* ASYNC_AUDIO_PROCESSOR_INCLUDED */
/*
* This file has not been truncated
*/
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