volume.cpp
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上传日期:2009-03-27
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- /*****************************************************************************
- * volume.cpp
- *****************************************************************************
- * Copyright (C) 2003 VideoLAN
- * $Id: volume.cpp 6961 2004-03-05 17:34:23Z sam $
- *
- * Authors: Cyril Deguet <asmax@via.ecp.fr>
- * Olivier Teuli鑢e <ipkiss@via.ecp.fr>
- *
- * 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, USA.
- *****************************************************************************/
- #include <stdio.h> // snprintf
- #include <vlc/aout.h>
- #include "volume.hpp"
- Volume::Volume( intf_thread_t *pIntf ): VarPercent( pIntf )
- {
- // Initial value
- audio_volume_t val;
- aout_VolumeGet( getIntf(), &val );
- VarPercent::set( val / AOUT_VOLUME_MAX );
- }
- void Volume::set( float percentage )
- {
- // Avoid looping forever...
- if( (int)(get() * AOUT_VOLUME_MAX) !=
- (int)(percentage * AOUT_VOLUME_MAX) )
- {
- VarPercent::set( percentage );
- aout_VolumeSet( getIntf(), (int)(get() * AOUT_VOLUME_MAX) );
- }
- }
- string Volume::getAsStringPercent() const
- {
- int value = (int)(100. * VarPercent::get());
- // 0 <= value <= 100, so we need 4 chars
- char *str = new char[4];
- snprintf( str, 4, "%d", value );
- string ret = str;
- delete[] str;
- return ret;
- }