plugins: Enable extra ASIO monitoring track for transitions and slideshow

Modifies obs-transitions and image-source.
This allows the audio of transitions such as stingers and slideshows to
be heard on the ASIO monitoring track.

Signed-off-by: pkv <pkv@obsproject.com>

Author: pkviet

plugins/image-source/obs-slideshow-mk2.c

@@ -896,7 +896,7 @@ static inline bool ss_audio_render_(obs_source_t *transition, uint64_t *ts_out,
 		return false;
 
 	obs_source_get_audio_mix(transition, &child_audio);
-	for (size_t mix = 0; mix < MAX_AUDIO_MIXES; mix++) {
+	for (size_t mix = 0; mix < MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES; mix++) {
 		if ((mixers & (1 << mix)) == 0)
 			continue;
 

plugins/image-source/obs-slideshow.c

@@ -783,7 +783,7 @@ static inline bool ss_audio_render_(obs_source_t *transition, uint64_t *ts_out,
 		return false;
 
 	obs_source_get_audio_mix(transition, &child_audio);
-	for (size_t mix = 0; mix < MAX_AUDIO_MIXES; mix++) {
+	for (size_t mix = 0; mix < MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES; mix++) {
 		if ((mixers & (1 << mix)) == 0)
 			continue;
 

plugins/obs-transitions/transition-stinger.c

@@ -504,7 +504,7 @@ static bool stinger_audio_render(void *data, uint64_t *ts_out, struct obs_source
 	struct obs_source_audio_mix child_audio;
 	obs_source_get_audio_mix(s->media_source, &child_audio);
 
-	for (size_t mix = 0; mix < MAX_AUDIO_MIXES; mix++) {
+	for (size_t mix = 0; mix < MAX_AUDIO_MIXES + MAX_AUDIO_MONITORING_MIXES; mix++) {
 		if ((mixers & (1 << mix)) == 0)
 			continue;