diff options
Diffstat (limited to 'indra/media_plugins/cef/windows_volume_catcher.cpp')
| -rw-r--r-- | indra/media_plugins/cef/windows_volume_catcher.cpp | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/indra/media_plugins/cef/windows_volume_catcher.cpp b/indra/media_plugins/cef/windows_volume_catcher.cpp new file mode 100644 index 0000000000..0cfb810906 --- /dev/null +++ b/indra/media_plugins/cef/windows_volume_catcher.cpp @@ -0,0 +1,147 @@ +/** + * @file windows_volume_catcher.cpp + * @brief A Windows implementation of volume level control of all audio channels opened by a process. + * + * @cond + * $LicenseInfo:firstyear=2010&license=viewerlgpl$ + * Second Life Viewer Source Code + * Copyright (C) 2010, Linden Research, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; + * version 2.1 of the License only. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA + * $/LicenseInfo$ + * @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; + + // tests if running on Vista, 7, 8 + once in CTOR + bool isWindowsVistaOrHigher(); + + F32 mVolume; + F32 mPan; + bool mSystemIsVistaOrHigher; +}; + +bool VolumeCatcherImpl::isWindowsVistaOrHigher() +{ + OSVERSIONINFO osvi; + ZeroMemory(&osvi, sizeof(OSVERSIONINFO)); + osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); + GetVersionEx(&osvi); + return osvi.dwMajorVersion >= 6; +} + +VolumeCatcherImpl::VolumeCatcherImpl() +: mVolume(1.0f), // default volume is max + mPan(0.f) // default pan is centered +{ + mSystemIsVistaOrHigher = isWindowsVistaOrHigher(); + + if ( ! mSystemIsVistaOrHigher ) + { + 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 ( mSystemIsVistaOrHigher ) + { + // set both left/right to same volume + // TODO: use pan value to set independently + DWORD left_channel = (DWORD)(mVolume * 65535.0f); + DWORD right_channel = (DWORD)(mVolume * 65535.0f); + DWORD hw_volume = left_channel << 16 | right_channel; + ::waveOutSetVolume(NULL, hw_volume); + } + else + { + 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. +} + + |