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117 lines
3.1 KiB
117 lines
3.1 KiB
/* aKode AudioBuffer
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Copyright (C) 2004-2005 Allan Sandfeld Jensen <kde@carewolf.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#ifndef _AKODE_AUDIOBUFFER_H
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#define _AKODE_AUDIOBUFFER_H
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#include "audioframe.h"
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#include "akode_export.h"
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#include "thread.h"
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namespace aKode {
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//! A reentrant circular buffer of AudioFrames
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/*!
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* A buffer of AudioFrame to synchronize audio between two threads, one putting and one getting.
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*/
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class AKODE_EXPORT AudioBuffer {
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const unsigned int length;
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AudioFrame* buffer;
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volatile unsigned int readPos;
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volatile unsigned int writePos;
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Mutex mutex;
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Condition not_empty;
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Condition not_full;
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volatile bool flushed, released, paused, m_eof;
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public:
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/*!
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* Constructs a buffer with \a len AudioFrames.
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*/
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AudioBuffer(unsigned int len);
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~AudioBuffer();
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/*!
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* Puts the AudioFrame \a buf into the buffer. If blocking is set to true,
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* put will block until the buffer is not full.
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* Returns true if succesfull.
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*
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* \note That put will fail even if blocking is set, if flush or release is called.
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*/
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bool put(AudioFrame* buf, bool blocking = false);
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/*!
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* Gets one AudioFrame from the buffer. If blocking is set to true,
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* get will block until the buffer is not empty.
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* Returns true if succesfull.
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*
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* \note That get will fail even if blocking is set if release is called.
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*/
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bool get(AudioFrame* buf, bool blocking = false);
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/*!
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* Returns the position of the next audioFrame in the buffer
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*/
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long position();
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/*!
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* Returns true if the buffer is empty.
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*/
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bool empty();
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/*!
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* Returns true if the buffer is full.
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*/
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bool full();
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/*!
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* Sets EOF for the incomming stream. Releases any blocking get-calls.
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*/
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void setEOF();
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/*!
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* Returns true if the sender has set the EOF flag.
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*/
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bool eof();
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/*!
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* Resets the buffer to be as good as new.
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*/
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void reset();
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/*!
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* Flushes the buffer and releases any blocking put-calls.
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*/
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void flush();
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/*!
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* Releases all blocking threads and prepares the buffer for deletion.
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* Use reset to make the buffer usable again.
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*/
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void release();
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/*!
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* Blocks the buffer for reading.
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*/
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void pause();
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/*!
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* Un-blocks the buffer for reading.
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*/
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void resume();
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};
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} // namespace
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#endif
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