volume.cpp
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:2k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * volume.cpp
- *****************************************************************************
- * Copyright (C) 2003 the VideoLAN team
- * $Id: 9227a61abb9c8198d07df341e96268d4bdc540db $
- *
- * Authors: Cyril Deguet <asmax@via.ecp.fr>
- * Olivier Teulière <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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include <vlc_common.h>
- #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 * 2.0 / 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 / 2.0) );
- }
- }
- 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;
- }