/usr/include/svxlink/AsyncAudioPacer.h is in libasyncaudio-dev 17.12.1-2.
This file is owned by root:root, with mode 0o644.
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@file AsyncAudioPacer.h
@brief An audio pipe class for pacing audio output
@author Tobias Blomberg / SM0SVX
@date 2007-11-17
\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 AUDIO_PACER_INCLUDED
#define AUDIO_PACER_INCLUDED
/****************************************************************************
*
* System Includes
*
****************************************************************************/
#include <sigc++/sigc++.h>
/****************************************************************************
*
* Project Includes
*
****************************************************************************/
#include <AsyncAudioSink.h>
#include <AsyncAudioSource.h>
/****************************************************************************
*
* Local Includes
*
****************************************************************************/
/****************************************************************************
*
* Forward declarations
*
****************************************************************************/
/****************************************************************************
*
* Namespace
*
****************************************************************************/
namespace Async
{
/****************************************************************************
*
* Forward declarations of classes inside of the declared namespace
*
****************************************************************************/
class Timer;
/****************************************************************************
*
* Defines & typedefs
*
****************************************************************************/
/****************************************************************************
*
* Exported Global Variables
*
****************************************************************************/
/****************************************************************************
*
* Class definitions
*
****************************************************************************/
/**
@brief An audio pipe class that pace audio output
@author Tobias Blomberg
@date 2007-11-17
This class is used in an audio pipe chain to pace audio output.
*/
class AudioPacer : public AudioSink, public AudioSource, public sigc::trackable
{
public:
/**
* @brief Constuctor
* @param sample_rate The sample rate of the incoming samples
* @param block_size The size of the audio blocks
* @param prebuf_time The time (ms) to wait before starting to send audio
*/
AudioPacer(int sample_rate, int block_size, int prebuf_time);
/**
* @brief Destructor
*/
~AudioPacer(void);
/**
* @brief Write samples into this audio sink
* @param samples The buffer containing the samples
* @param count The number of samples in the buffer
* @return Returns the number of samples that has been taken care of
*
* This function is used to write audio into this audio sink. If it
* returns 0, no more samples should be written until the resumeOutput
* function in the source have been called.
* This function is normally only called from a connected source object.
*/
virtual int writeSamples(const float *samples, int count);
/**
* @brief Tell the sink to flush the previously written samples
*
* This function is used to tell the sink to flush previously written
* samples. When done flushing, the sink should call the
* sourceAllSamplesFlushed function.
* This function is normally only called from a connected source object.
*/
virtual void flushSamples(void);
/**
* @brief Resume audio output to the sink
*
* This function will be called when the registered audio sink is ready
* to accept more samples.
* This function is normally only called from a connected sink object.
*/
virtual void resumeOutput(void);
protected:
/**
* @brief The registered sink has flushed all samples
*
* This function will be called when all samples have been flushed in the
* registered sink. If it is not reimplemented, a handler must be set
* that handle the function call.
* This function is normally only called from a connected sink object.
*/
virtual void allSamplesFlushed(void);
private:
int sample_rate;
int buf_size;
int prebuf_time;
float *buf;
int buf_pos;
int prebuf_samples;
Async::Timer *pace_timer;
bool do_flush;
bool input_stopped;
void outputNextBlock(Async::Timer *t=0);
}; /* class AudioPacer */
} /* namespace */
#endif /* AUDIO_PACER_INCLUDED */
/*
* This file has not been truncated
*/
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