libobs, UI: Add SDR white nits option

UI/data/locale/en-US.ini

@@ -1036,6 +1036,7 @@ Basic.Settings.Advanced.Video.ColorSpace="Color Space"
 Basic.Settings.Advanced.Video.ColorRange="Color Range"
 Basic.Settings.Advanced.Video.ColorRange.Partial="Partial"
 Basic.Settings.Advanced.Video.ColorRange.Full="Full"
+Basic.Settings.Advanced.Video.SdrWhiteLevel="SDR White Level (nits)"
 Basic.Settings.Advanced.Audio.MonitoringDevice="Monitoring Device"
 Basic.Settings.Advanced.Audio.MonitoringDevice.Default="Default"
 Basic.Settings.Advanced.Audio.DisableAudioDucking="Disable Windows audio ducking"

UI/forms/OBSBasicSettings.ui

@@ -4989,35 +4989,15 @@
                      </item>
                     </widget>
                    </item>
-                   <item row="4" column="1">
-                    <layout class="QHBoxLayout" name="horizontalLayout_18">
-                     <property name="leftMargin">
-                      <number>0</number>
-                     </property>
-                     <property name="topMargin">
-                      <number>0</number>
-                     </property>
-                     <property name="rightMargin">
-                      <number>0</number>
+                   <item row="3" column="0">
+                    <widget class="QLabel" name="label_33">
+                     <property name="text">
+                      <string>Basic.Settings.Advanced.Video.ColorSpace</string>
                      </property>
-                     <property name="bottomMargin">
-                      <number>0</number>
+                     <property name="buddy">
+                      <cstring>colorSpace</cstring>
                      </property>
-                     <item>
-                      <widget class="QCheckBox" name="disableOSXVSync">
-                       <property name="text">
-                        <string>DisableOSXVSync</string>
-                       </property>
-                      </widget>
-                     </item>
-                     <item>
-                      <widget class="QCheckBox" name="resetOSXVSync">
-                       <property name="text">
-                        <string>ResetOSXVSyncOnExit</string>
-                       </property>
-                      </widget>
-                     </item>
-                    </layout>
+                    </widget>
                    </item>
                    <item row="3" column="1">
                     <layout class="QHBoxLayout" name="horizontalLayout_20">
@@ -5073,17 +5053,73 @@
                      </item>
                     </layout>
                    </item>
-                   <item row="3" column="0">
-                    <widget class="QLabel" name="label_33">
+                   <item row="4" column="0">
+                    <widget class="QLabel" name="label_sdrWhiteLevel">
                      <property name="text">
-                      <string>Basic.Settings.Advanced.Video.ColorSpace</string>
+                      <string>Basic.Settings.Advanced.Video.SdrWhiteLevel</string>
                      </property>
                      <property name="buddy">
-                      <cstring>colorSpace</cstring>
+                      <cstring>sdrWhiteLevel</cstring>
                      </property>
                     </widget>
                    </item>
-                   <item row="4" column="0">
+                   <item row="4" column="1">
+                    <layout class="QHBoxLayout" name="horizontalLayout_sdrPaperWhite">
+                     <property name="leftMargin">
+                      <number>0</number>
+                     </property>
+                     <property name="topMargin">
+                      <number>0</number>
+                     </property>
+                     <property name="rightMargin">
+                      <number>0</number>
+                     </property>
+                     <property name="bottomMargin">
+                      <number>0</number>
+                     </property>
+                     <item>
+                      <widget class="QSpinBox" name="sdrWhiteLevel">
+                       <property name="minimum">
+                        <number>80</number>
+                       </property>
+                       <property name="maximum">
+                        <number>480</number>
+                       </property>
+                      </widget>
+                     </item>
+                    </layout>
+                   </item>
+                   <item row="5" column="1">
+                    <layout class="QHBoxLayout" name="horizontalLayout_18">
+                     <property name="leftMargin">
+                      <number>0</number>
+                     </property>
+                     <property name="topMargin">
+                      <number>0</number>
+                     </property>
+                     <property name="rightMargin">
+                      <number>0</number>
+                     </property>
+                     <property name="bottomMargin">
+                      <number>0</number>
+                     </property>
+                     <item>
+                      <widget class="QCheckBox" name="disableOSXVSync">
+                       <property name="text">
+                        <string>DisableOSXVSync</string>
+                       </property>
+                      </widget>
+                     </item>
+                     <item>
+                      <widget class="QCheckBox" name="resetOSXVSync">
+                       <property name="text">
+                        <string>ResetOSXVSyncOnExit</string>
+                       </property>
+                      </widget>
+                     </item>
+                    </layout>
+                   </item>
+                   <item row="6" column="0">
                     <spacer name="horizontalSpacer_12">
                      <property name="orientation">
                       <enum>Qt::Horizontal</enum>

UI/window-basic-main.cpp

@@ -1490,6 +1490,7 @@ bool OBSBasic::InitBasicConfigDefaults()
 	config_set_default_string(basicConfig, "Video", "ColorSpace", "709");
 	config_set_default_string(basicConfig, "Video", "ColorRange",
 				  "Partial");
+	config_set_default_uint(basicConfig, "Video", "SdrWhiteLevel", 300);
 
 	config_set_default_string(basicConfig, "Audio", "MonitoringDeviceId",
 				  "default");
@@ -4392,6 +4393,8 @@ int OBSBasic::ResetVideo()
 	}
 
 	if (ret == OBS_VIDEO_SUCCESS) {
+		obs_set_video_sdr_white_level((float)config_get_uint(
+			basicConfig, "Video", "SdrWhiteLevel"));
 		OBSBasicStats::InitializeValues();
 		OBSProjector::UpdateMultiviewProjectors();
 	}

UI/window-basic-settings.cpp

@@ -531,6 +531,7 @@ OBSBasicSettings::OBSBasicSettings(QWidget *parent)
 	HookWidget(ui->colorFormat,          COMBO_CHANGED,  ADV_CHANGED);
 	HookWidget(ui->colorSpace,           COMBO_CHANGED,  ADV_CHANGED);
 	HookWidget(ui->colorRange,           COMBO_CHANGED,  ADV_CHANGED);
+	HookWidget(ui->sdrWhiteLevel,        SCROLL_CHANGED, ADV_CHANGED);
 	HookWidget(ui->disableOSXVSync,      CHECK_CHANGED,  ADV_CHANGED);
 	HookWidget(ui->resetOSXVSync,        CHECK_CHANGED,  ADV_CHANGED);
 	if (obs_audio_monitoring_available())
@@ -2521,6 +2522,8 @@ void OBSBasicSettings::LoadAdvancedSettings()
 		config_get_string(main->Config(), "Video", "ColorSpace");
 	const char *videoColorRange =
 		config_get_string(main->Config(), "Video", "ColorRange");
+	uint32_t sdrWhiteLevel = (uint32_t)config_get_uint(
+		main->Config(), "Video", "SdrWhiteLevel");
 
 	QString monDevName;
 	QString monDevId;
@@ -2592,6 +2595,7 @@ void OBSBasicSettings::LoadAdvancedSettings()
 	SetComboByName(ui->colorFormat, videoColorFormat);
 	SetComboByName(ui->colorSpace, videoColorSpace);
 	SetComboByValue(ui->colorRange, videoColorRange);
+	ui->sdrWhiteLevel->setValue(sdrWhiteLevel);
 
 	if (!SetComboByValue(ui->bindToIP, bindIP))
 		SetInvalidValue(ui->bindToIP, bindIP, bindIP);
@@ -3297,6 +3301,7 @@ void OBSBasicSettings::SaveAdvancedSettings()
 	SaveCombo(ui->colorFormat, "Video", "ColorFormat");
 	SaveCombo(ui->colorSpace, "Video", "ColorSpace");
 	SaveComboData(ui->colorRange, "Video", "ColorRange");
+	SaveSpinBox(ui->sdrWhiteLevel, "Video", "SdrWhiteLevel");
 	if (obs_audio_monitoring_available()) {
 		SaveCombo(ui->monitoringDevice, "Audio",
 			  "MonitoringDeviceName");

docs/sphinx/reference-core.rst

@@ -147,11 +147,25 @@ Initialization, Shutdown, and Information
 .. function:: bool obs_get_video_info(struct obs_video_info *ovi)
 
    Gets the current video settings.
-   
+
    :return: *false* if no video
 
 ---------------------
 
+.. function:: float obs_get_video_sdr_white_level(void)
+
+   Gets the current SDR white level.
+
+   :return: SDR white level, 300.f if no video
+
+---------------------
+
+.. function:: void obs_set_video_sdr_white_level(float sdr_white_level)
+
+   Sets the current SDR white level.
+
+---------------------
+
 .. function:: bool obs_get_audio_info(struct obs_audio_info *oai)
 
    Gets the current audio settings.

libobs/obs-internal.h

@@ -321,6 +321,7 @@ struct obs_core_video {
 	gs_effect_t *deinterlace_yadif_2x_effect;
 
 	struct obs_video_info ovi;
+	uint32_t sdr_white_level;
 
 	pthread_mutex_t task_mutex;
 	struct circlebuf tasks;

libobs/obs.c

@@ -1301,6 +1301,20 @@ bool obs_get_video_info(struct obs_video_info *ovi)
 	return true;
 }
 
+float obs_get_video_sdr_white_level(void)
+{
+	struct obs_core_video *video = &obs->video;
+	return video->graphics ? video->sdr_white_level : 300.f;
+}
+
+void obs_set_video_sdr_white_level(float sdr_white_level)
+{
+	struct obs_core_video *video = &obs->video;
+	assert(video->graphics);
+
+	video->sdr_white_level = (uint32_t)sdr_white_level;
+}
+
 bool obs_get_audio_info(struct obs_audio_info *oai)
 {
 	struct obs_core_audio *audio = &obs->audio;

libobs/obs.h

@@ -410,6 +410,12 @@ EXPORT bool obs_reset_audio(const struct obs_audio_info *oai);
 /** Gets the current video settings, returns false if no video */
 EXPORT bool obs_get_video_info(struct obs_video_info *ovi);
 
+/** Gets the SDR white level, returns 300.0 if no video */
+EXPORT float obs_get_video_sdr_white_level(void);
+
+/** Sets the SDR white level */
+EXPORT void obs_set_video_sdr_white_level(float sdr_white_level);
+
 /** Gets the current audio settings, returns false if no audio */
 EXPORT bool obs_get_audio_info(struct obs_audio_info *oai);