UI: Use advanced mode audio track in multitrack video output

UI/multitrack-video-output.cpp

@@ -335,7 +335,7 @@ SetupOBSOutput(obs_data_t *dump_stream_to_file_config,
 	       const GoLiveApi::Config &go_live_config,
 	       std::vector<OBSEncoderAutoRelease> &audio_encoders,
 	       std::shared_ptr<obs_encoder_group_t> &video_encoder_group,
-	       const char *audio_encoder_id,
+	       const char *audio_encoder_id, size_t main_audio_mixer,
 	       std::optional<size_t> vod_track_mixer);
 static void SetupSignalHandlers(bool recording, MultitrackVideoOutput *self,
 				obs_output_t *output, OBSSignal &start,
@@ -348,7 +348,7 @@ void MultitrackVideoOutput::PrepareStreaming(
 	std::optional<uint32_t> maximum_aggregate_bitrate,
 	std::optional<uint32_t> maximum_video_tracks,
 	std::optional<std::string> custom_config,
-	obs_data_t *dump_stream_to_file_config,
+	obs_data_t *dump_stream_to_file_config, size_t main_audio_mixer,
 	std::optional<size_t> vod_track_mixer)
 {
 	{
@@ -467,7 +467,8 @@ void MultitrackVideoOutput::PrepareStreaming(
 	std::shared_ptr<obs_encoder_group_t> video_encoder_group;
 	auto outputs = SetupOBSOutput(dump_stream_to_file_config, output_config,
 				      audio_encoders, video_encoder_group,
-				      audio_encoder_id, vod_track_mixer);
+				      audio_encoder_id, main_audio_mixer,
+				      vod_track_mixer);
 	auto output = std::move(outputs.output);
 	auto recording_output = std::move(outputs.recording_output);
 	if (!output)
@@ -728,7 +729,7 @@ static void
 create_audio_encoders(const GoLiveApi::Config &go_live_config,
 		      std::vector<OBSEncoderAutoRelease> &audio_encoders,
 		      obs_output_t *output, obs_output_t *recording_output,
-		      const char *audio_encoder_id,
+		      const char *audio_encoder_id, size_t main_audio_mixer,
 		      std::optional<size_t> vod_track_mixer)
 {
 	using encoder_configs_type =
@@ -768,7 +769,8 @@ create_audio_encoders(const GoLiveApi::Config &go_live_config,
 	};
 
 	create_encoders("multitrack video live audio",
-			go_live_config.audio_configurations.live, 0);
+			go_live_config.audio_configurations.live,
+			main_audio_mixer);
 
 	if (!vod_track_mixer.has_value())
 		return;
@@ -787,7 +789,7 @@ SetupOBSOutput(obs_data_t *dump_stream_to_file_config,
 	       const GoLiveApi::Config &go_live_config,
 	       std::vector<OBSEncoderAutoRelease> &audio_encoders,
 	       std::shared_ptr<obs_encoder_group_t> &video_encoder_group,
-	       const char *audio_encoder_id,
+	       const char *audio_encoder_id, size_t main_audio_mixer,
 	       std::optional<size_t> vod_track_mixer)
 {
 
@@ -803,7 +805,7 @@ SetupOBSOutput(obs_data_t *dump_stream_to_file_config,
 
 	create_audio_encoders(go_live_config, audio_encoders, output,
 			      recording_output, audio_encoder_id,
-			      vod_track_mixer);
+			      main_audio_mixer, vod_track_mixer);
 
 	return {std::move(output), std::move(recording_output)};
 }

UI/multitrack-video-output.hpp

@@ -35,6 +35,7 @@ public:
 			      std::optional<uint32_t> maximum_video_tracks,
 			      std::optional<std::string> custom_config,
 			      obs_data_t *dump_stream_to_file_config,
+			      size_t main_audio_mixer,
 			      std::optional<size_t> vod_track_mixer);
 	signal_handler_t *StreamingSignalHandler();
 	void StartedStreaming();

UI/window-basic-main-outputs.cpp

@@ -1138,7 +1138,7 @@ FutureHolder<bool> SimpleOutput::SetupStreaming(obs_service_t *service)
 							  : std::nullopt;
 
 	auto holder = SetupMultitrackVideo(
-		service, GetSimpleAACEncoderForBitrate(audio_bitrate),
+		service, GetSimpleAACEncoderForBitrate(audio_bitrate), 0,
 		vod_track_mixer);
 	auto future =
 		PreventFutureDeadlock(holder.future)
@@ -2286,9 +2286,13 @@ FutureHolder<bool> AdvancedOutput::SetupStreaming(obs_service_t *service)
 
 	const char *audio_encoder_id =
 		config_get_string(main->Config(), "AdvOut", "AudioEncoder");
+	int streamTrackIndex =
+		config_get_int(main->Config(), "AdvOut", "TrackIndex");
 
-	auto holder = SetupMultitrackVideo(service, audio_encoder_id,
-					   VodTrackMixerIdx(service));
+	auto holder =
+		SetupMultitrackVideo(service, audio_encoder_id,
+				     static_cast<size_t>(streamTrackIndex),
+				     VodTrackMixerIdx(service));
 	auto future =
 		PreventFutureDeadlock(holder.future)
 			.then(main, [&](std::optional<bool>
@@ -2701,10 +2705,9 @@ std::string BasicOutputHandler::GetRecordingFilename(
 
 extern std::string DeserializeConfigText(const char *text);
 
-FutureHolder<std::optional<bool>>
-BasicOutputHandler::SetupMultitrackVideo(obs_service_t *service,
-					 std::string audio_encoder_id,
-					 std::optional<size_t> vod_track_mixer)
+FutureHolder<std::optional<bool>> BasicOutputHandler::SetupMultitrackVideo(
+	obs_service_t *service, std::string audio_encoder_id,
+	size_t main_audio_mixer, std::optional<size_t> vod_track_mixer)
 {
 	if (!multitrackVideo)
 		return {[] {}, CreateFuture().then([] {
@@ -2784,7 +2787,8 @@ BasicOutputHandler::SetupMultitrackVideo(obs_service_t *service,
 					audio_encoder_id.c_str(),
 					maximum_aggregate_bitrate,
 					maximum_video_tracks, custom_config,
-					stream_dump_config, vod_track_mixer);
+					stream_dump_config, main_audio_mixer,
+					vod_track_mixer);
 			} catch (const MultitrackVideoError &error) {
 				return error;
 			}

UI/window-basic-main-outputs.hpp

@@ -98,10 +98,9 @@ protected:
 					 bool overwrite, const char *format,
 					 bool ffmpeg);
 
-	FutureHolder<std::optional<bool>>
-	SetupMultitrackVideo(obs_service_t *service,
-			     std::string audio_encoder_id,
-			     std::optional<size_t> vod_track_mixer);
+	FutureHolder<std::optional<bool>> SetupMultitrackVideo(
+		obs_service_t *service, std::string audio_encoder_id,
+		size_t main_audio_mixer, std::optional<size_t> vod_track_mixer);
 	OBSDataAutoRelease GenerateMultitrackVideoStreamDumpConfig();
 };