Repo created

TMessagesProj/jni/voip/libtgvoip/JitterBuffer.h

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+//
+// libtgvoip is free and unencumbered public domain software.
+// For more information, see http://unlicense.org or the UNLICENSE file
+// you should have received with this source code distribution.
+//
+
+#ifndef LIBTGVOIP_JITTERBUFFER_H
+#define LIBTGVOIP_JITTERBUFFER_H
+
+#include <stdlib.h>
+#include <vector>
+#include <stdio.h>
+#include "MediaStreamItf.h"
+#include "BlockingQueue.h"
+#include "Buffers.h"
+#include "threading.h"
+
+#define JITTER_SLOT_COUNT 64
+#define JITTER_SLOT_SIZE 1024
+#define JR_OK 1
+#define JR_MISSING 2
+#define JR_BUFFERING 3
+
+
+namespace tgvoip{
+class JitterBuffer{
+public:
+	JitterBuffer(MediaStreamItf* out, uint32_t step);
+	~JitterBuffer();
+	void SetMinPacketCount(uint32_t count);
+	int GetMinPacketCount();
+	unsigned int GetCurrentDelay();
+	double GetAverageDelay();
+	void Reset();
+	void HandleInput(unsigned char* data, size_t len, uint32_t timestamp, bool isEC);
+	size_t HandleOutput(unsigned char* buffer, size_t len, int offsetInSteps, bool advance, int& playbackScaledDuration, bool& isEC);
+	void Tick();
+	void GetAverageLateCount(double* out);
+	int GetAndResetLostPacketCount();
+	double GetLastMeasuredJitter();
+	double GetLastMeasuredDelay();
+
+private:
+	struct jitter_packet_t{
+		unsigned char* buffer=NULL;
+		size_t size;
+		uint32_t timestamp;
+		bool isEC;
+		double recvTimeDiff;
+	};
+	static size_t CallbackIn(unsigned char* data, size_t len, void* param);
+	static size_t CallbackOut(unsigned char* data, size_t len, void* param);
+	void PutInternal(jitter_packet_t* pkt, bool overwriteExisting);
+	int GetInternal(jitter_packet_t* pkt, int offset, bool advance);
+	void Advance();
+
+	BufferPool bufferPool;
+	Mutex mutex;
+	jitter_packet_t slots[JITTER_SLOT_COUNT];
+	int64_t nextTimestamp=0;
+	uint32_t step;
+	double minDelay=6;
+	uint32_t minMinDelay;
+	uint32_t maxMinDelay;
+	uint32_t maxUsedSlots;
+	uint32_t lastPutTimestamp;
+	uint32_t lossesToReset;
+	double resyncThreshold;
+	unsigned int lostCount=0;
+	unsigned int lostSinceReset=0;
+	unsigned int gotSinceReset=0;
+	bool wasReset=true;
+	bool needBuffering=true;
+	HistoricBuffer<int, 64, double> delayHistory;
+	HistoricBuffer<int, 64, double> lateHistory;
+	bool adjustingDelay=false;
+	unsigned int tickCount=0;
+	unsigned int latePacketCount=0;
+	unsigned int dontIncMinDelay=0;
+	unsigned int dontDecMinDelay=0;
+	int lostPackets=0;
+	double prevRecvTime=0;
+	double expectNextAtTime=0;
+	HistoricBuffer<double, 64> deviationHistory;
+	double lastMeasuredJitter=0;
+	double lastMeasuredDelay=0;
+	int outstandingDelayChange=0;
+	unsigned int dontChangeDelay=0;
+	double avgDelay=0;
+	bool first=true;
+#ifdef TGVOIP_DUMP_JITTER_STATS
+	FILE* dump;
+#endif
+};
+}
+
+#endif //LIBTGVOIP_JITTERBUFFER_H