code

Plugins/AndroidVulkanVideo_5.3/Source/AndroidVulkanVideo/Private/UnrealAudioOut.h

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+// ------------------------------------------------
+// Copyright Joe Marshall 2024- All Rights Reserved
+// ------------------------------------------------
+//
+// Unreal IAudioOut implementation. This uses a
+// USoundWaveProcedural to do the output, and also
+// a UAudioComponent object. If given a parent
+// actor object which has an existing
+// UAudioComponent, it uses that. Otherwise it
+// makes a new UAudioComponent and holds a strong
+// object pointer to it until this class is
+// destroyed.
+// ------------------------------------------------
+#pragma once
+
+#include "Sound/SoundWaveProcedural.h"
+#include <chrono>
+#include <cstdint>
+
+#include "IAudioOut.h"
+
+#include "UnrealAudioOut.generated.h"
+
+class USoundWaveProceduralWithTiming;
+class UAudioComponent;
+class UActorComponent;
+
+UCLASS(MinimalAPI)
+class USoundWaveProceduralWithTiming : public USoundWaveProcedural
+{
+    GENERATED_BODY()
+  public:
+    virtual int32 GeneratePCMData(uint8 *PCMData, const int32 SamplesNeeded) override;
+    virtual void ResetAudio();
+    virtual void QueueSilence(int64_t bytes);
+    bool paused;
+    bool hasTiming;
+    int64_t lastBufSendTime;
+};
+
+class UnrealAudioOut : public IAudioOut
+{
+  public:
+    explicit UnrealAudioOut(UActorComponent *owner);
+    virtual ~UnrealAudioOut() override;
+    virtual void init(int sampleRate, int channels) override;
+    virtual void initSilent() override;
+    virtual void close() override;
+    virtual void sendBuffer(uint8_t *buf, int bufSize, int64_t presentationTimeNS,
+                            bool reset = false) override;
+    virtual int64_t getPresentationTimeNS() override; // current presentation time
+    virtual IAudioOut::NsTime getWaitTimeForPresentationTime(int64_t presentationTimeNS,
+                                                             int64_t maxDuration) override;
+    virtual bool setVolume(float volume) override;
+    virtual void setPlaying(bool playing) override;
+    virtual bool setRate(float rate) override;
+    virtual void onSeek(int64_t newPresentationTimeNS, bool resetAudio) override;
+    virtual int64_t getQueuedTimeNS() override;
+    virtual void onHasVideoTime(int64_t newPresentationTimeNS) override;
+
+  private:
+    TObjectPtr<USoundWaveProceduralWithTiming> audioSender;
+    UActorComponent *owner;
+    TWeakObjectPtr<UAudioComponent> audioComponent;
+    TObjectPtr<UAudioComponent> audioComponentWeCreated;
+    bool hasTimeOffset;
+    int64_t presentationTimeOffset;
+    int numChannels;
+    int sampleRate;
+    bool isPlaying;
+
+    bool afterSeek;
+
+    float playbackRate;
+
+    int64_t pausedPresentationTime;
+};