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Diffstat (limited to 'indra/media_plugins/webkit/windows_volume_catcher.cpp')
| -rw-r--r-- | indra/media_plugins/webkit/windows_volume_catcher.cpp | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/indra/media_plugins/webkit/windows_volume_catcher.cpp b/indra/media_plugins/webkit/windows_volume_catcher.cpp new file mode 100644 index 0000000000..ef96102a0a --- /dev/null +++ b/indra/media_plugins/webkit/windows_volume_catcher.cpp @@ -0,0 +1,122 @@ +/** + * @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. +} + + |