windows_volume_catcher.cpp, now with comments!
also added volume_catcher.h to projectmeow-7.2.2
Richard Linden
parent
882436ba06
commit
e6daa50c58
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@ -36,6 +36,10 @@ set(media_plugin_webkit_SOURCE_FILES
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media_plugin_webkit.cpp
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)
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set(media_plugin_webkit_HEADER_FILES
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volume_catcher.h
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)
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set(media_plugin_webkit_LINK_LIBRARIES
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${LLPLUGIN_LIBRARIES}
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${MEDIA_PLUGIN_BASE_LIBRARIES}
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@ -66,6 +70,11 @@ else (LINUX AND PULSEAUDIO)
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list(APPEND media_plugin_webkit_SOURCE_FILES dummy_volume_catcher.cpp)
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endif (LINUX AND PULSEAUDIO)
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set_source_files_properties(${media_plugin_webkit_HEADER_FILES}
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PROPERTIES HEADER_FILE_ONLY TRUE)
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list(APPEND media_plugin_webkit_SOURCE_FILES ${media_plugin_webkit_HEADER_FILES})
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add_library(media_plugin_webkit
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SHARED
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${media_plugin_webkit_SOURCE_FILES}
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@ -32,8 +32,12 @@
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*/
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#include "volume_catcher.h"
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#include <windows.h>
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#include <windows.h>
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//
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// Abstracts a Win32 mixer line and associated state
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// for muting and changing volume on a given output
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//
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class Mixer
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{
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public:
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@ -44,81 +48,91 @@ public:
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void setVolume(F32 volume_left, F32 volume_right);
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private:
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// use create(index) to create a Mixer
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Mixer(HMIXER handle, U32 mute_control_id, U32 volume_control_id, U32 min_volume, U32 max_volume);
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HMIXER mHandle;
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U32 mMuteControlID;
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U32 mVolumeControlID;
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U32 mMinVolume;
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U32 mMaxVolume;
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HMIXER mHandle;
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U32 mMuteControlID; // handle to mixer controller for muting
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U32 mVolumeControlID; // handle to mixer controller for changing volume
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U32 mMinVolume; // value that specifies minimum volume as reported by mixer
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U32 mMaxVolume; // value that specifies maximum volume as reported by mixer
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};
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// factory function that attempts to create a Mixer object associated with a given mixer line index
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// returns NULL if creation failed
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// static
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Mixer* Mixer::create(U32 index)
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{
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// get handle to mixer object
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HMIXER mixer_handle;
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MMRESULT result = mixerOpen( &mixer_handle,
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index,
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0, // HWND to call when state changes - not used
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0, // user data for callback - not used
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MIXER_OBJECTF_MIXER );
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MMRESULT result = mixerOpen( &mixer_handle,
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index,
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0, // HWND to call when state changes - not used
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0, // user data for callback - not used
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MIXER_OBJECTF_MIXER );
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if (result == MMSYSERR_NOERROR)
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{
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MIXERLINE mixer_line;
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mixer_line.cbStruct = sizeof( MIXERLINE );
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// try speakers first
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MIXERLINE mixer_line;
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mixer_line.cbStruct = sizeof( MIXERLINE );
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// try speakers first
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mixer_line.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_SPEAKERS;
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MMRESULT result = mixerGetLineInfo( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
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&mixer_line,
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MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE );
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if (result != MMSYSERR_NOERROR)
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{
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// failed - try headphones next
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mixer_line.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_HEADPHONES;
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result = mixerGetLineInfo( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
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&mixer_line,
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MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE );
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}
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MMRESULT result = mixerGetLineInfo( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
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&mixer_line,
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MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE );
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if (result != MMSYSERR_NOERROR)
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{ // failed - try headphones next
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mixer_line.dwComponentType = MIXERLINE_COMPONENTTYPE_DST_HEADPHONES;
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result = mixerGetLineInfo( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
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&mixer_line,
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MIXER_OBJECTF_HMIXER | MIXER_GETLINEINFOF_COMPONENTTYPE );
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}
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if (result == MMSYSERR_NOERROR)
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{
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// get control id
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MIXERCONTROL mixer_control;
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MIXERLINECONTROLS mixer_line_controls;
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mixer_line_controls.cbStruct = sizeof( MIXERLINECONTROLS );
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mixer_line_controls.dwLineID = mixer_line.dwLineID;
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mixer_line_controls.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;
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mixer_line_controls.cControls = 1;
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mixer_line_controls.cbmxctrl = sizeof( MIXERCONTROL );
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mixer_line_controls.pamxctrl = &mixer_control;
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result = mixerGetLineControls( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
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&mixer_line_controls,
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MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE );
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if (result == MMSYSERR_NOERROR )
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{
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// We have a mute mixer. Remember the mute control id
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U32 mute_control_id = mixer_control.dwControlID;
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// now query for volume controls
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mixer_line_controls.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
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result = mixerGetLineControls( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
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&mixer_line_controls,
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MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE );
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if (result == MMSYSERR_NOERROR)
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{
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// we have both mute and volume controls for this mixer, so remember it
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return new Mixer(mixer_handle,
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mute_control_id,
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mixer_control.dwControlID,
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mixer_control.Bounds.dwMinimum,
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mixer_control.Bounds.dwMaximum);
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}
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}
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}
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{ // successfully found mixer line object, now use it to get volume and mute controls
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// reuse these objects to query for both volume and mute controls
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MIXERCONTROL mixer_control;
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MIXERLINECONTROLS mixer_line_controls;
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mixer_line_controls.cbStruct = sizeof( MIXERLINECONTROLS );
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mixer_line_controls.dwLineID = mixer_line.dwLineID;
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mixer_line_controls.cControls = 1;
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mixer_line_controls.cbmxctrl = sizeof( MIXERCONTROL );
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mixer_line_controls.pamxctrl = &mixer_control;
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// first, query for mute
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mixer_line_controls.dwControlType = MIXERCONTROL_CONTROLTYPE_MUTE;
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// get control id for mute controls
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result = mixerGetLineControls( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
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&mixer_line_controls,
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MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE );
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if (result == MMSYSERR_NOERROR )
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{ // we have a mute controls. Remember the mute control id and then query for
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// volume controls using the same struct, but different dwControlType
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U32 mute_control_id = mixer_control.dwControlID;
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mixer_line_controls.dwControlType = MIXERCONTROL_CONTROLTYPE_VOLUME;
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result = mixerGetLineControls( reinterpret_cast< HMIXEROBJ >( mixer_handle ),
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&mixer_line_controls,
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MIXER_OBJECTF_HMIXER | MIXER_GETLINECONTROLSF_ONEBYTYPE );
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if (result == MMSYSERR_NOERROR)
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{ // we have both mute and volume controls for this mixer, so we're keeping it
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return new Mixer(mixer_handle,
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mute_control_id,
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mixer_control.dwControlID,
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mixer_control.Bounds.dwMinimum,
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mixer_control.Bounds.dwMaximum);
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}
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}
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}
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}
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// if we got here, we didn't successfully create a Mixer object
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mixerClose(mixer_handle);
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return NULL;
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}
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@ -131,47 +145,55 @@ Mixer::Mixer(HMIXER handle, U32 mute_control_id, U32 volume_control_id, U32 min_
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{}
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Mixer::~Mixer()
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{
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}
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{}
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// toggle mute for this mixer
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// if mute is set, then volume level will be ignored
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void Mixer::setMute(bool mute)
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{
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MIXERCONTROLDETAILS_BOOLEAN mixer_control_details_bool = { mute };
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MIXERCONTROLDETAILS mixer_control_details;
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mixer_control_details.cbStruct = sizeof( MIXERCONTROLDETAILS );
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mixer_control_details.dwControlID = mMuteControlID;
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mixer_control_details.cChannels = 1;
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mixer_control_details.cMultipleItems = 0;
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mixer_control_details.cbDetails = sizeof( MIXERCONTROLDETAILS_BOOLEAN );
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mixer_control_details.paDetails = &mixer_control_details_bool;
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mixerSetControlDetails( reinterpret_cast< HMIXEROBJ >( mHandle ),
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&mixer_control_details,
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MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE );
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MIXERCONTROLDETAILS_BOOLEAN mixer_control_details_bool = { mute };
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MIXERCONTROLDETAILS mixer_control_details;
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mixer_control_details.cbStruct = sizeof( MIXERCONTROLDETAILS );
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mixer_control_details.dwControlID = mMuteControlID;
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mixer_control_details.cChannels = 1;
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mixer_control_details.cMultipleItems = 0;
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mixer_control_details.cbDetails = sizeof( MIXERCONTROLDETAILS_BOOLEAN );
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mixer_control_details.paDetails = &mixer_control_details_bool;
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mixerSetControlDetails( reinterpret_cast< HMIXEROBJ >( mHandle ),
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&mixer_control_details,
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MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE );
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}
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// set individual volume levels for left and right channels
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// if mute is set, then these values will apply once mute is unset
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void Mixer::setVolume(F32 volume_left, F32 volume_right)
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{
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// assuming pan is in range [-1, 1] set volume levels accordingly
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// if pan == -1 then volume_left_mixer = volume_left && volume_right_mixer = 0
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// if pan == 0 then volume_left_mixer = volume_left && volume_right_mixer = volume_right
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// if pan == 1 then volume_left_mixer = 0 && volume_right_mixer = volume_right
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U32 volume_left_mixer = (U32)
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((F32)mMinVolume
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+ (volume_left * ((F32)mMaxVolume - (F32)mMinVolume)));
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U32 volume_right_mixer = (U32)
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((F32)mMinVolume
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+ (volume_right * ((F32)mMaxVolume - (F32)mMinVolume)));
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MIXERCONTROLDETAILS_UNSIGNED mixer_control_details_unsigned[ 2 ] = { volume_left_mixer, volume_right_mixer };
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MIXERCONTROLDETAILS mixer_control_details;
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mixer_control_details.cbStruct = sizeof( MIXERCONTROLDETAILS );
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mixer_control_details.dwControlID = mVolumeControlID;
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mixer_control_details.cChannels = 2;
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mixer_control_details.cMultipleItems = 0;
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mixer_control_details.cbDetails = sizeof( MIXERCONTROLDETAILS_UNSIGNED );
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mixer_control_details.paDetails = &mixer_control_details_unsigned;
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mixerSetControlDetails( reinterpret_cast< HMIXEROBJ >( mHandle ),
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&mixer_control_details,
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MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE );
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}
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// pass volume levels on to mixer
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MIXERCONTROLDETAILS_UNSIGNED mixer_control_details_unsigned[ 2 ] = { volume_left_mixer, volume_right_mixer };
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MIXERCONTROLDETAILS mixer_control_details;
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mixer_control_details.cbStruct = sizeof( MIXERCONTROLDETAILS );
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mixer_control_details.dwControlID = mVolumeControlID;
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mixer_control_details.cChannels = 2;
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mixer_control_details.cMultipleItems = 0;
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mixer_control_details.cbDetails = sizeof( MIXERCONTROLDETAILS_UNSIGNED );
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mixer_control_details.paDetails = &mixer_control_details_unsigned;
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mixerSetControlDetails( reinterpret_cast< HMIXEROBJ >( mHandle ),
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&mixer_control_details,
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MIXER_OBJECTF_HMIXER | MIXER_SETCONTROLDETAILSF_VALUE );
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}
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class VolumeCatcherImpl
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{
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@ -207,9 +229,10 @@ VolumeCatcherImpl *VolumeCatcherImpl::getInstance()
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}
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VolumeCatcherImpl::VolumeCatcherImpl()
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: mVolume(1.0f),
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mPan(0.f) // 0 is centered
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: mVolume(1.0f), // default volume is max
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mPan(0.f) // default pan is centered
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{
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// for each reported mixer "device", create a proxy object and add to list
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U32 num_mixers = mixerGetNumDevs();
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for (U32 mixer_index = 0; mixer_index < num_mixers; ++mixer_index)
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{
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@ -241,7 +264,9 @@ void VolumeCatcherImpl::setVolume(F32 volume)
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for(mixer_vector_t::iterator it = mMixers.begin(), end_it = mMixers.end();
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it != end_it;
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++it)
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{
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{ // set volume levels and mute for each mixer
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// note that a muted mixer will ignore this volume level
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(*it)->setVolume(left_volume, right_volume);
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if (volume == 0.f && mVolume != 0.f)
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@ -258,7 +283,7 @@ void VolumeCatcherImpl::setVolume(F32 volume)
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}
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void VolumeCatcherImpl::setPan(F32 pan)
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{
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{ // remember pan for calculating individual channel levels later
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mPan = pan;
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}
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