104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
/**
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* @file windows_volume_catcher.cpp
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* @brief A Windows implementation of volume level control of all audio channels opened by a process.
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*
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* @cond
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* $LicenseInfo:firstyear=2010&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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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 Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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* @endcond
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*/
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#include "volume_catcher.h"
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#include <windows.h>
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#include "llmemory.h"
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class VolumeCatcherImpl : public LLSingleton<VolumeCatcherImpl>
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{
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friend LLSingleton<VolumeCatcherImpl>;
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public:
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void setVolume(F32 volume);
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void setPan(F32 pan);
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private:
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// This is a singleton class -- both callers and the component implementation should use getInstance() to find the instance.
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VolumeCatcherImpl();
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~VolumeCatcherImpl();
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F32 mVolume;
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F32 mPan;
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};
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VolumeCatcherImpl::VolumeCatcherImpl()
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: mVolume(1.0f), // default volume is max
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mPan(0.f) // default pan is centered
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{
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}
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VolumeCatcherImpl::~VolumeCatcherImpl()
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{
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}
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void VolumeCatcherImpl::setVolume(F32 volume)
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{
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mVolume = volume;
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// set both left/right to same volume
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// TODO: use pan value to set independently
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DWORD left_channel = (DWORD)(mVolume * 65535.0f);
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DWORD right_channel = (DWORD)(mVolume * 65535.0f);
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DWORD hw_volume = left_channel << 16 | right_channel;
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::waveOutSetVolume(NULL, hw_volume);
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}
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void VolumeCatcherImpl::setPan(F32 pan)
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{ // remember pan for calculating individual channel levels later
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mPan = pan;
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}
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/////////////////////////////////////////////////////
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VolumeCatcher::VolumeCatcher()
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{
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pimpl = VolumeCatcherImpl::getInstance();
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}
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VolumeCatcher::~VolumeCatcher()
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{
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// Let the instance persist until exit.
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}
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void VolumeCatcher::setVolume(F32 volume)
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{
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pimpl->setVolume(volume);
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}
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void VolumeCatcher::setPan(F32 pan)
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{
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pimpl->setPan(pan);
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}
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void VolumeCatcher::pump()
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{
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// No periodic tasks are necessary for this implementation.
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}
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