Add initial project files and implement basic audio-visual recording functionality

Source/AudioVideoRecord/AudioVideoRecordGameMode.h

@@ -6,6 +6,9 @@
 #include "GameFramework/GameModeBase.h"
 #include "AudioVideoRecordGameMode.generated.h"
 
+class USoundBase;
+class UAudioComponent;
+
 /**
  *  Simple GameMode for a first person game
  */
@@ -16,6 +19,21 @@ class AAudioVideoRecordGameMode : public AGameModeBase
 
 public:
 	AAudioVideoRecordGameMode();
+
+	/** Background music to play when the level starts. Assign in Blueprint. */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Audio")
+	USoundBase* BGMSound = nullptr;
+
+	/** Volume multiplier for BGM (0.0 – 1.0). */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Audio", meta = (ClampMin = "0.0", ClampMax = "1.0"))
+	float BGMVolume = 0.5f;
+
+protected:
+	virtual void BeginPlay() override;
+
+private:
+	UPROPERTY()
+	UAudioComponent* BGMAudioComponent = nullptr;
 };