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20589f19e4
Until now, Mixer not only was responsible for rendering audio buffers but also managed writing them to audio backend (through a FIFO) and handled various quality related parameters. All this functionality has been moved into the new AudioOutputContext class. It glues together AudioBackend (formerly called AudioDevice), global quality settings and the Mixer. The AudioOutputContext class creates a FifoWriter which calls Mixer::renderNextBuffer() and writes the output into the BufferFifo of the AudioOutputContext it belongs to. The BufferFifo is read by the according AudioBackend which belongs to the AudioOutputContext as well. The AudioOutputContext also handles resampling in case the AudioBackend wants the buffers in a different samplerate. During this rewrite the Mixer class and the according source files have been renamed from "mixer" to "Mixer". This results in small changes all over LMMS' code base.
94 lines
2.1 KiB
C++
94 lines
2.1 KiB
C++
/*
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* AudioSdl.h - device-class that performs PCM-output via SDL
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*
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* Copyright (c) 2004-2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU 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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*
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* This program 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef _AUDIO_SDL_H
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#define _AUDIO_SDL_H
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#include "lmmsconfig.h"
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#ifdef LMMS_HAVE_SDL
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#include <QtCore/QSemaphore>
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#include <SDL/SDL.h>
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#include <SDL/SDL_audio.h>
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#include "AudioBackend.h"
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class QLineEdit;
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class AudioSdl : public AudioBackend
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{
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public:
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AudioSdl( bool & _success_ful, AudioOutputContext * context );
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virtual ~AudioSdl();
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inline static QString name()
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{
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return QT_TRANSLATE_NOOP( "setupWidget",
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"SDL (Simple DirectMedia Layer)" );
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}
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class setupWidget : public AudioBackend::setupWidget
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{
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public:
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setupWidget( QWidget * _parent );
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virtual ~setupWidget();
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virtual void saveSettings();
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private:
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QLineEdit * m_device;
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} ;
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private:
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virtual void startProcessing();
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virtual void stopProcessing();
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virtual void applyQualitySettings();
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static void sdlAudioCallback( void * _udata, Uint8 * _buf, int _len );
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void sdlAudioCallback( Uint8 * _buf, int _len );
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SDL_AudioSpec m_audioHandle;
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sampleFrameA * m_outBuf;
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intSampleFrameA * m_convertedBuf;
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int m_convertedBufPos;
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int m_convertedBufSize;
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bool m_convertEndian;
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volatile bool m_stopped;
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QSemaphore m_stopSemaphore;
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} ;
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#endif
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#endif
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