merge

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.
+}
+
+