/usr/include/svxlink/AsyncAudioMixer.h is in libasyncaudio-dev 14.08.1-2.
This file is owned by root:root, with mode 0o644.
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@file AsyncAudioMixer.h
@brief This file contains an audio mixer class
@author Tobias Blomberg / SM0SVX
@date 2007-10-05
\verbatim
Async - A library for programming event driven applications
Copyright (C) 2004-2007 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_MIXER_INCLUDED
#define ASYNC_AUDIO_MIXER_INCLUDED
/****************************************************************************
*
* System Includes
*
****************************************************************************/
#include <list>
/****************************************************************************
*
* Project Includes
*
****************************************************************************/
#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 A class for mixing audio streams
@author Tobias Blomberg / SM0SVX
@date 2007-10-05
This class is used to mix audio streams together.
*/
class AudioMixer : public sigc::trackable, public Async::AudioSource
{
public:
/**
* @brief Default constuctor
*/
AudioMixer(void);
/**
* @brief Destructor
*/
~AudioMixer(void);
/**
* @brief Add an audio source to the mixer
* @param source The audio source to add
*/
void addSource(AudioSource *source);
/**
* @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.
*/
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.
* This function is normally only called from a connected sink object.
*/
void allSamplesFlushed(void);
private:
class MixerSrc;
static const int OUTBUF_SIZE = 256;
std::list<MixerSrc *> sources;
Timer *delayed_exec_timer;
float outbuf[OUTBUF_SIZE];
unsigned outbuf_pos;
unsigned outbuf_cnt;
bool is_flushed;
bool output_stopped;
AudioMixer(const AudioMixer&);
AudioMixer& operator=(const AudioMixer&);
void setAudioAvailable(void);
void flushSamples(void);
void outputHandler(Timer *t);
void checkFlush(void);
friend class MixerSrc;
}; /* class AudioMixer */
} /* namespace */
#endif /* ASYNC_AUDIO_MIXER_INCLUDED */
/*
* This file has not been truncated
*/
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