/usr/include/svxlink/AsyncAudioSelector.h is in libasyncaudio-dev 17.12.1-2.
This file is owned by root:root, with mode 0o644.
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@file AsyncAudioSelector.h
@brief This file contains a class that is used to select one of many audio
streams.
@author Tobias Blomberg / SM0SVX
@date 2006-08-01
\verbatim
Async - A library for programming event driven applications
Copyright (C) 2004-2017 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_SELECTOR_INCLUDED
#define ASYNC_AUDIO_SELECTOR_INCLUDED
/****************************************************************************
*
* System Includes
*
****************************************************************************/
#include <map>
/****************************************************************************
*
* Project Includes
*
****************************************************************************/
#include <AsyncAudioSource.h>
/****************************************************************************
*
* Local Includes
*
****************************************************************************/
/****************************************************************************
*
* Forward declarations
*
****************************************************************************/
/****************************************************************************
*
* Namespace
*
****************************************************************************/
namespace Async
{
/****************************************************************************
*
* Forward declarations of classes inside of the declared namespace
*
****************************************************************************/
/****************************************************************************
*
* Defines & typedefs
*
****************************************************************************/
/****************************************************************************
*
* Exported Global Variables
*
****************************************************************************/
/****************************************************************************
*
* Class definitions
*
****************************************************************************/
/**
@brief This class is used to select one of many audio streams
@author Tobias Blomberg / SM0SVX
@date 2006-08-01
This class is used to select one of many incoming audio streams. Incoming
samples on non-selected branches will be thrown away.
*/
class AudioSelector : public AudioSource
{
public:
/**
* @brief Default constuctor
*/
AudioSelector(void);
/**
* @brief Destructor
*/
~AudioSelector(void);
/**
* @brief Add an audio source to the selector
* @param source The audio source to add
*/
void addSource(AudioSource *source);
/**
* @brief Remove a previously added audio source from the selector
* @param source The audio source to remove
*/
void removeSource(AudioSource *source);
/**
* @brief Set the prio to be used for selection
* @param source The audio source
* @param prio The priority to set. Higher numbers give higher priority.
*/
void setSelectionPrio(AudioSource *source, int prio);
/**
* @brief Enable autoselection on the given source
* @param source The audio source
* @param prio The priority to set. Higher numbers give higher priority.
*/
void enableAutoSelect(AudioSource *source, int prio);
/**
* @brief Disable autoselection on the given source
* @param source The audio source
*/
void disableAutoSelect(AudioSource *source);
/**
* @brief Find out if auto select is enabled or not for the given source
* @param source The audio source
* @return Returns \em true if auto select is enabled for the given source
* or else \em false is returned
*/
bool autoSelectEnabled(AudioSource *source) const;
/**
* @brief Select one of the previously added audio sources
* @param source The audio source to select. 0 = none selected.
*/
void selectSource(AudioSource *source);
/**
* @brief Set if this souce want to wait for allSamplesFlushed
* @param source The audio source to select. 0 = none selected.
* @param flush_wait Set to \em true to wait for flush or else \em false
*
* Normally after a source signals flush, the audio selector will wait until
* the connected sink signals that all samples have been flushed before
* any other source with the same or lower priority can be selected.
* If flush_wait is set to false, the selector will immediately signal
* all samples flushed to the source and if any other source is active,
* that source will immediately be switched in without sending a flush
* command to the sink.
*/
void setFlushWait(AudioSource *source, bool flush_wait);
/**
* @brief Resume audio output to the sink
*
* This function will be called when the registered audio sink is ready to
* accept more samples. It is normally only called from a connected sink
* object.
*/
virtual void resumeOutput(void);
protected:
virtual void allSamplesFlushed(void);
private:
typedef enum
{
STATE_IDLE, STATE_WRITING, STATE_STOPPED, STATE_FLUSHING
} StreamState;
class Branch;
typedef std::map<Async::AudioSource *, Branch *> BranchMap;
BranchMap m_branch_map;
Branch * m_selected_branch;
StreamState m_stream_state;
AudioSelector(const AudioSelector&);
AudioSelector& operator=(const AudioSelector&);
void selectBranch(Branch *branch);
Branch *selectedBranch(void) const { return m_selected_branch; }
void selectHighestPrioActiveBranch(bool clear_if_no_active);
int branchWriteSamples(const float *samples, int count);
void branchFlushSamples(void);
friend class Branch;
}; /* class AudioSelector */
} /* namespace */
#endif /* ASYNC_AUDIO_SELECTOR_INCLUDED */
/*
* This file has not been truncated
*/
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