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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.
115 lines
2.5 KiB
C++
115 lines
2.5 KiB
C++
/*
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* AudioFileDevice.h - base-class for audio-device-classes which write
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* their output into a file
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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_FILE_DEVICE_H
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#define _AUDIO_FILE_DEVICE_H
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#include <QtCore/QFile>
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#include "AudioBackend.h"
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class AudioFileDevice : public AudioBackend
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{
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public:
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AudioFileDevice( const sample_rate_t _sample_rate,
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const ch_cnt_t _channels, const QString & _file,
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const bool _use_vbr,
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const bitrate_t _nom_bitrate,
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const bitrate_t _min_bitrate,
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const bitrate_t _max_bitrate,
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const int _depth,
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AudioOutputContext * context );
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virtual ~AudioFileDevice();
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QString outputFile() const
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{
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return m_outputFile.fileName();
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}
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protected:
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Sint32 writeData( const void * _data, Sint32 _len );
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inline bool useVBR() const
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{
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return m_useVbr;
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}
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inline bitrate_t nominalBitrate() const
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{
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return m_nomBitrate;
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}
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inline bitrate_t minBitrate() const
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{
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return m_minBitrate;
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}
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inline bitrate_t maxBitrate() const
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{
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return m_maxBitrate;
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}
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inline int depth() const
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{
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return m_depth;
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}
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inline bool outputFileOpened() const
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{
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return m_outputFile.isOpen();
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}
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private:
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QFile m_outputFile;
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bool m_useVbr;
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bitrate_t m_nomBitrate;
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bitrate_t m_minBitrate;
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bitrate_t m_maxBitrate;
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int m_depth;
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} ;
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typedef AudioFileDevice * ( * AudioFileDeviceInstantiaton )
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( const sample_rate_t _sample_rate,
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const ch_cnt_t _channels,
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bool & _success_ful,
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const QString & _file,
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const bool _use_vbr,
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const bitrate_t _nom_bitrate,
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const bitrate_t _min_bitrate,
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const bitrate_t _max_bitrate,
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const int _depth,
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AudioOutputContext * mixer );
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#endif
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