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/**
* @file windows_volume_catcher.cpp
* @brief A Windows implementation of volume level control of all audio channels opened by a process.
*
* @cond
* $LicenseInfo:firstyear=2010&license=viewergpl$
*
* Copyright (c) 2010, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
* @endcond
*/
#include "volume_catcher.h"
#include <windows.h>
#include "llsingleton.h"
class VolumeCatcherImpl : public LLSingleton<VolumeCatcherImpl>
{
friend LLSingleton<VolumeCatcherImpl>;
public:
void setVolume(F32 volume);
void setPan(F32 pan);
private:
// This is a singleton class -- both callers and the component implementation should use getInstance() to find the instance.
VolumeCatcherImpl();
~VolumeCatcherImpl();
typedef void (WINAPI *set_volume_func_t)(F32);
typedef void (WINAPI *set_mute_func_t)(bool);
set_volume_func_t mSetVolumeFunc;
set_mute_func_t mSetMuteFunc;
F32 mVolume;
F32 mPan;
};
VolumeCatcherImpl::VolumeCatcherImpl()
: mVolume(1.0f), // default volume is max
mPan(0.f) // default pan is centered
{
HMODULE handle = ::LoadLibrary(L"winmm.dll");
if(handle)
{
mSetVolumeFunc = (set_volume_func_t)::GetProcAddress(handle, "setPluginVolume");
mSetMuteFunc = (set_mute_func_t)::GetProcAddress(handle, "setPluginMute");
}
}
VolumeCatcherImpl::~VolumeCatcherImpl()
{
}
void VolumeCatcherImpl::setVolume(F32 volume)
{
mVolume = volume;
if (mSetMuteFunc)
{
mSetMuteFunc(volume == 0.f);
}
if (mSetVolumeFunc)
{
mSetVolumeFunc(mVolume);
}
}
void VolumeCatcherImpl::setPan(F32 pan)
{ // remember pan for calculating individual channel levels later
mPan = pan;
}
/////////////////////////////////////////////////////
VolumeCatcher::VolumeCatcher()
{
pimpl = VolumeCatcherImpl::getInstance();
}
VolumeCatcher::~VolumeCatcher()
{
// Let the instance persist until exit.
}
void VolumeCatcher::setVolume(F32 volume)
{
pimpl->setVolume(volume);
}
void VolumeCatcher::setPan(F32 pan)
{
pimpl->setPan(pan);
}
void VolumeCatcher::pump()
{
// No periodic tasks are necessary for this implementation.
}
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