libobs: Add a fader_muted member to obs_source

When a user pushes down the fader to minimum, this tags the source as
fader_muted to be used alongside the muted and user_muted members.
To narrow the use of this member, we keep it distinct from muted and
user_muted.
This will be used by audio deduplication logic.

Signed-off-by: pkv <[email protected]>

Author: pkviet

libobs/obs-audio-controls.c

@@ -600,8 +600,10 @@ bool obs_fader_set_db(obs_fader_t *fader, const float db)
 
 	pthread_mutex_unlock(&fader->mutex);
 
-	if (src)
+	if (src) {
 		obs_source_set_volume(src, mul);
+		src->fader_muted = (fader->cur_db <= fader->min_db) ? true : false;
+	}
 
 	return !clamped;
 }
@@ -677,6 +679,7 @@ bool obs_fader_attach_source(obs_fader_t *fader, obs_source_t *source)
 
 	fader->source = source;
 	fader->cur_db = mul_to_db(vol);
+	source->fader_muted = (fader->cur_db <= fader->min_db) ? true : false;
 
 	pthread_mutex_unlock(&fader->mutex);
 

libobs/obs-internal.h

@@ -888,6 +888,7 @@ struct obs_source {
 	float balance;
 	/* audio_is_duplicated: tracks whether a source appears multiple times in the audio tree during this tick */
 	bool audio_is_duplicated;
+	bool fader_muted;
 
 	/* async video data */
 	gs_texture_t *async_textures[MAX_AV_PLANES];

libobs/obs-source.c

@@ -435,6 +435,7 @@ static obs_source_t *obs_source_create_internal(const char *id, const char *name
 
 	/* audio deduplication initialization */
 	source->audio_is_duplicated = false;
+	source->fader_muted = false;
 
 	obs_source_init_finalize(source, canvas);
 	if (!private) {