EXT-6921 - Windows Xp/Vista unified volume control

1 files changed, 23 insertions, 223 deletions

diff --git a/indra/media_plugins/webkit/windows_volume_catcher.cpp b/indra/media_plugins/webkit/windows_volume_catcher.cpp
index 8debe8fac6..fdff28c2c1 100644
--- a/indra/media_plugins/webkit/windows_volume_catcher.cpp
+++ b/indra/media_plugins/webkit/windows_volume_catcher.cpp
@@ -33,262 +33,62 @@
 
 #include "volume_catcher.h"
 #include <windows.h>
+#include "llsingleton.h"
 
-//
-// Abstracts a Win32 mixer line and associated state
-// for muting and changing volume on a given output
-//
-class Mixer
-{
-public:
-	static Mixer* create(U32 index);
-	~Mixer();
-
-	void setMute(bool mute);
-	void setVolume(F32 volume_left, F32 volume_right);
-
-private:
-	// use create(index) to create a Mixer
-	Mixer(HMIXER handle, U32 mute_control_id, U32 volume_control_id, U32 min_volume, U32 max_volume);
-
-	HMIXER	mHandle;		
-	U32		mMuteControlID;		// handle to mixer controller for muting
-	U32		mVolumeControlID;	// handle to mixer controller for changing volume
-	U32		mMinVolume;			// value that specifies minimum volume as reported by mixer
-	U32		mMaxVolume;			// value that specifies maximum volume as reported by mixer
-};
-
-// factory function that attempts to create a Mixer object associated with a given mixer line index
-// returns NULL if creation failed
-// static 
-Mixer* Mixer::create(U32 index)
-{
-	// get handle to mixer object
-	HMIXER mixer_handle;
-	MMRESULT result = mixerOpen( &mixer_handle,
-							index,	
-							0,	// HWND to call when state changes - not used
-							0,	// user data for callback - not used
-							MIXER_OBJECTF_MIXER );
-
-	if (result == MMSYSERR_NOERROR)
-	{
-		MIXERLINE mixer_line;
-		mixer_line.cbStruct = sizeof( MIXERLINE );
-
-		// try speakers first
-		mixer_line.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
-
-		MMRESULT result = mixerGetLineInfo( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
-								&mixer_line,
-								MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE );
-		if (result != MMSYSERR_NOERROR)
-		{	// failed - try headphones next
-			mixer_line.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_HEADPHONES;
-			result = mixerGetLineInfo( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
-									&mixer_line,
-									MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE );
-		}
-
-		if (result == MMSYSERR_NOERROR)
-		{	// successfully found mixer line object, now use it to get volume and mute controls
-
-			// reuse these objects to query for both volume and mute controls
-			MIXERCONTROL mixer_control;
-			MIXERLINECONTROLS mixer_line_controls;
-			mixer_line_controls.cbStruct = sizeof( MIXERLINECONTROLS );
-			mixer_line_controls.dwLineID = mixer_line.dwLineID;
-			mixer_line_controls.cControls = 1;
-			mixer_line_controls.cbmxctrl = sizeof( MIXERCONTROL );
-			mixer_line_controls.pamxctrl = &mixer_control;
-
-			// first, query for mute
-			mixer_line_controls.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;
-
-			// get control id for mute controls
-			result = mixerGetLineControls( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
-				&mixer_line_controls,
-				MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE );
-			if (result == MMSYSERR_NOERROR )
-			{	// we have a mute controls.  Remember the mute control id and then query for 
-				// volume controls using the same struct, but different dwControlType
-
-				U32 mute_control_id = mixer_control.dwControlID;
-				mixer_line_controls.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
-				result = mixerGetLineControls( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
-					&mixer_line_controls,
-					MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE );
-
-				if (result == MMSYSERR_NOERROR)
-				{	// we have both mute and volume controls for this mixer, so we're keeping it
-					return new Mixer(mixer_handle, 
-								mute_control_id, 
-								mixer_control.dwControlID, 
-								mixer_control.Bounds.dwMinimum, 
-								mixer_control.Bounds.dwMaximum);
-				}
-			}
-		}
-	}
-
-	// if we got here, we didn't successfully create a Mixer object
-	mixerClose(mixer_handle);
-	return NULL;
-}
-
-Mixer::Mixer(HMIXER handle, U32 mute_control_id, U32 volume_control_id, U32 min_volume, U32 max_volume)
-:	mHandle(handle),
-	mMuteControlID(mute_control_id),
-	mVolumeControlID(volume_control_id),
-	mMinVolume(min_volume),
-	mMaxVolume(max_volume)
-{}
-
-Mixer::~Mixer()
-{}
-
-// toggle mute for this mixer
-// if mute is set, then volume level will be ignored
-void Mixer::setMute(bool mute)
-{
-	MIXERCONTROLDETAILS_BOOLEAN mixer_control_details_bool = { mute };
-	MIXERCONTROLDETAILS mixer_control_details;
-	mixer_control_details.cbStruct = sizeof( MIXERCONTROLDETAILS );
-	mixer_control_details.dwControlID = mMuteControlID;
-	mixer_control_details.cChannels = 1;
-	mixer_control_details.cMultipleItems = 0;
-	mixer_control_details.cbDetails = sizeof( MIXERCONTROLDETAILS_BOOLEAN );
-	mixer_control_details.paDetails = &mixer_control_details_bool;
-
-	mixerSetControlDetails( reinterpret_cast< HMIXEROBJ >( mHandle ),
-								 &mixer_control_details,
-								 MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE );
-}
-
-// set individual volume levels for left and right channels
-// if mute is set, then these values will apply once mute is unset
-void Mixer::setVolume(F32 volume_left, F32 volume_right)
-{
-	// assuming pan is in range [-1, 1] set volume levels accordingly
-	// if pan == -1 then	volume_left_mixer = volume_left	&& volume_right_mixer = 0
-	// if pan == 0 then		volume_left_mixer = volume_left	&& volume_right_mixer = volume_right
-	// if pan == 1 then		volume_left_mixer = 0			&& volume_right_mixer = volume_right
-	U32 volume_left_mixer = (U32)
-							((F32)mMinVolume 
-								+ (volume_left * ((F32)mMaxVolume - (F32)mMinVolume)));
-	U32 volume_right_mixer = (U32)
-							((F32)mMinVolume 
-								+ (volume_right * ((F32)mMaxVolume - (F32)mMinVolume)));
-
-	// pass volume levels on to mixer
-	MIXERCONTROLDETAILS_UNSIGNED mixer_control_details_unsigned[ 2 ] = { volume_left_mixer, volume_right_mixer };
-	MIXERCONTROLDETAILS mixer_control_details;
-	mixer_control_details.cbStruct = sizeof( MIXERCONTROLDETAILS );
-	mixer_control_details.dwControlID = mVolumeControlID;
-	mixer_control_details.cChannels = 2;
-	mixer_control_details.cMultipleItems = 0;
-	mixer_control_details.cbDetails = sizeof( MIXERCONTROLDETAILS_UNSIGNED );
-	mixer_control_details.paDetails = &mixer_control_details_unsigned;
-
-	mixerSetControlDetails( reinterpret_cast< HMIXEROBJ >( mHandle ),
-								 &mixer_control_details,
-								 MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE );
-}
-
-class VolumeCatcherImpl
+class VolumeCatcherImpl : public LLSingleton<VolumeCatcherImpl>
 {
+friend LLSingleton<VolumeCatcherImpl>;
 public:
 
 	void setVolume(F32 volume);
 	void setPan(F32 pan);
 	
-	static VolumeCatcherImpl *getInstance();
 private:
 	// This is a singleton class -- both callers and the component implementation should use getInstance() to find the instance.
 	VolumeCatcherImpl();
 	~VolumeCatcherImpl();
 
-	static VolumeCatcherImpl *sInstance;
-	
+	typedef void (*set_volume_func_t)(F32);
+	typedef void (*set_mute_func_t)(bool);
+
+	set_volume_func_t mSetVolumeFunc;
+	set_mute_func_t mSetMuteFunc;
+
 	F32 	mVolume;
 	F32 	mPan;
-	typedef std::vector<Mixer*> mixer_vector_t;
-	mixer_vector_t	mMixers;
 };
 
-VolumeCatcherImpl *VolumeCatcherImpl::sInstance = NULL;
-
-VolumeCatcherImpl *VolumeCatcherImpl::getInstance()
-{
-	if(!sInstance)
-	{
-		sInstance = new VolumeCatcherImpl;
-	}
-	
-	return sInstance;
-}
-
 VolumeCatcherImpl::VolumeCatcherImpl()
 :	mVolume(1.0f),	// default volume is max
 	mPan(0.f)		// default pan is centered
 {
-	OSVERSIONINFOEX	V = {sizeof(OSVERSIONINFOEX)};	//EX for NT 5.0 and later
-
-	::GetVersionEx((POSVERSIONINFO)&V);
-
-	// disable volume on XP and below
-	if (V.dwPlatformId == VER_PLATFORM_WIN32_NT && V.dwMajorVersion >= 6)
+	HMODULE handle = ::LoadLibrary(L"winmm.dll");
+	if(handle)
 	{
-		// for each reported mixer "device", create a proxy object and add to list
-		U32 num_mixers = mixerGetNumDevs();
-		for (U32 mixer_index = 0; mixer_index < num_mixers; ++mixer_index)
-		{
-			Mixer* mixerp = Mixer::create(mixer_index);
-			if (mixerp)
-			{
-				mMixers.push_back(mixerp);
-			}
-		}
+		mSetVolumeFunc = (set_volume_func_t)::GetProcAddress(handle, "setPluginVolume");
+		mSetMuteFunc = (set_mute_func_t)::GetProcAddress(handle, "setPluginMute");
 	}
 }
 
 VolumeCatcherImpl::~VolumeCatcherImpl()
 {
-	for(mixer_vector_t::iterator it = mMixers.begin(), end_it = mMixers.end();
-		it != end_it;
-		++it)
-	{
-		delete *it;
-		*it = NULL;
-	}
 }
 
 
 void VolumeCatcherImpl::setVolume(F32 volume)
 {
-	F32 left_volume = volume * min(1.f, 1.f - mPan);
-	F32 right_volume = volume * max(0.f, 1.f + mPan);
+	//F32 left_volume = volume * min(1.f, 1.f - mPan);
+	//F32 right_volume = volume * max(0.f, 1.f + mPan);
 	
-	for(mixer_vector_t::iterator it = mMixers.begin(), end_it = mMixers.end();
-		it != end_it;
-		++it)
-	{	// set volume levels and mute for each mixer
-		// note that a muted mixer will ignore this volume level
-
-		(*it)->setVolume(left_volume, right_volume);
-		
-		if (volume == 0.f && mVolume != 0.f)
-		{
-			(*it)->setMute(true);
-		}
-		else if (mVolume == 0.f && volume != 0.f)
-		{
-			(*it)->setMute(false);
-		}
-
-	}
-
 	mVolume = volume;
+	if (mSetMuteFunc)
+	{
+		mSetMuteFunc(volume == 0.f);
+	}
+	if (mSetVolumeFunc)
+	{
+		mSetVolumeFunc(mVolume);
+	}
 }
 
 void VolumeCatcherImpl::setPan(F32 pan)