libobs: Add obs_video_active() function

(This commit also modifies UI)

Adds a universal function for determining whether video output is
currently active, rather than having to use video_output_active() on the
value returned by obs_get_video().

UI/win-update/win-update.cpp

@@ -586,7 +586,7 @@ try {
 
 	auto ActiveOrGameCaptureLocked = [this] ()
 	{
-		if (video_output_active(obs_get_video())) {
+		if (obs_video_active()) {
 			if (manualUpdate)
 				info(QTStr("Updater.Running.Title"),
 				     QTStr("Updater.Running.Text"));

UI/window-basic-settings.cpp

@@ -1373,7 +1373,7 @@ void OBSBasicSettings::LoadVideoSettings()
 {
 	loading = true;
 
-	if (video_output_active(obs_get_video())) {
+	if (obs_video_active()) {
 		ui->videoPage->setEnabled(false);
 		ui->videoMsg->setText(
 				QTStr("Basic.Settings.Video.CurrentlyActive"));
@@ -1850,7 +1850,7 @@ void OBSBasicSettings::LoadOutputSettings()
 	LoadAdvOutputFFmpegSettings();
 	LoadAdvOutputAudioSettings();
 
-	if (video_output_active(obs_get_video())) {
+	if (obs_video_active()) {
 		ui->outputMode->setEnabled(false);
 		ui->outputModeLabel->setEnabled(false);
 		ui->simpleRecordingGroupBox->setEnabled(false);
@@ -2228,7 +2228,7 @@ void OBSBasicSettings::LoadAdvancedSettings()
 	if (!SetComboByValue(ui->bindToIP, bindIP))
 		SetInvalidValue(ui->bindToIP, bindIP, bindIP);
 
-	if (video_output_active(obs_get_video())) {
+	if (obs_video_active()) {
 		ui->advancedVideoContainer->setEnabled(false);
 	}
 

libobs/obs.c

@@ -1014,7 +1014,7 @@ int obs_reset_video(struct obs_video_info *ovi)
 	if (!obs) return OBS_VIDEO_FAIL;
 
 	/* don't allow changing of video settings if active. */
-	if (obs->video.video && video_output_active(obs->video.video))
+	if (obs->video.video && obs_video_active())
 		return OBS_VIDEO_CURRENTLY_ACTIVE;
 
 	if (!size_valid(ovi->output_width, ovi->output_height) ||
@@ -2258,3 +2258,12 @@ obs_data_t *obs_get_private_data(void)
 	obs_data_addref(private_data);
 	return private_data;
 }
+
+bool obs_video_active(void)
+{
+	struct obs_core_video *video = &obs->video;
+	if (!obs)
+		return false;
+
+	return os_atomic_load_long(&video->raw_active) > 0;
+}

libobs/obs.h

@@ -535,6 +535,9 @@ EXPORT audio_t *obs_get_audio(void);
 /** Gets the main video output handler for this OBS context */
 EXPORT video_t *obs_get_video(void);
 
+/** Returns true if video is active, false otherwise */
+EXPORT bool obs_video_active(void);
+
 /** Sets the primary output source for a channel. */
 EXPORT void obs_set_output_source(uint32_t channel, obs_source_t *source);