mirror of
https://github.com/danog/libtgvoip.git
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130 lines
3.3 KiB
C++
130 lines
3.3 KiB
C++
//
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// libtgvoip is free and unencumbered public domain software.
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// For more information, see http://unlicense.org or the UNLICENSE file
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// you should have received with this source code distribution.
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//
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#ifndef LIBTGVOIP_JITTERBUFFER_H
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#define LIBTGVOIP_JITTERBUFFER_H
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#include "controller/media/MediaStreamItf.h"
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#include "tools/BlockingQueue.h"
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#include "tools/Buffers.h"
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#include "tools/logging.h"
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#include "tools/threading.h"
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#include <algorithm>
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#include <atomic>
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#include <stdio.h>
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#include <stdlib.h>
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#include <vector>
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#define JITTER_SLOT_COUNT 64
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#define JR_OK 1
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#define JR_MISSING 2
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#define JR_BUFFERING 3
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#define INVALID_SEQ 0xFFFFFFFF
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namespace tgvoip
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{
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struct JitterArray
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{
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JitterArray(bool isEC);
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private:
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inline uint8_t getOffset(uint32_t seq)
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{
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return (back + (seq - backSeq)) % JITTER_SLOT_COUNT;
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}
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public:
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bool has(uint32_t seq);
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uint32_t put(uint32_t seq, std::unique_ptr<Buffer> &&buffer);
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std::array<std::unique_ptr<Buffer>, JITTER_SLOT_COUNT>::iterator get(uint32_t seq);
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void advance(uint32_t seq);
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void clear();
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uint8_t count();
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bool empty();
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auto end()
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{
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return slots.end();
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}
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uint8_t front = 0;
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uint8_t back = 0;
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uint32_t frontSeq = INVALID_SEQ;
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uint32_t backSeq = INVALID_SEQ;
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bool isEC = false;
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std::array<std::unique_ptr<Buffer>, JITTER_SLOT_COUNT> slots;
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};
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class JitterBuffer
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{
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public:
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JitterBuffer(uint32_t step);
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~JitterBuffer();
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void SetMinPacketCount(uint32_t count);
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int GetMinPacketCount();
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unsigned int GetCurrentDelay();
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double GetAverageDelay();
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void Reset();
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void HandleInput(std::unique_ptr<Buffer> &&buf, uint32_t timestamp, bool isEC);
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std::pair<std::unique_ptr<Buffer>, std::unique_ptr<Buffer>> HandleOutput(int &playbackScaledDuration);
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bool haveNext(bool ec);
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void Tick();
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void GetAverageLateCount(double *out);
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int GetAndResetLostPacketCount();
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double GetLastMeasuredJitter();
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double GetLastMeasuredDelay();
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double GetTimeoutWindow();
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private:
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Mutex mutex;
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int64_t lastMain = 0;
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JitterArray slotsMain{false};
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JitterArray slotsEc{true};
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uint32_t step;
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int32_t nextFetchTimestamp = 0; // What frame to read next (protected for GetSeqTooLate)
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std::atomic<double> minDelay{6};
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uint32_t minMinDelay;
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uint32_t maxMinDelay;
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uint32_t maxUsedSlots;
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uint32_t lastPutTimestamp;
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uint32_t lossesToReset;
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double resyncThreshold;
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unsigned int lostCount = 0;
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unsigned int lostSinceReset = 0;
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unsigned int gotSinceReset = 0;
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bool wasReset = true;
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bool needBuffering = true;
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HistoricBuffer<int, 64, double> delayHistory;
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HistoricBuffer<int, 64, double> lateHistory;
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bool adjustingDelay = false;
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unsigned int tickCount = 0;
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unsigned int latePacketCount = 0;
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unsigned int dontIncMinDelayFor = 0;
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unsigned int dontDecMinDelayFor = 0;
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int lostPackets = 0;
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double prevRecvTime = 0;
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double expectNextAtTimeMs = 0;
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HistoricBuffer<double, 64> deviationHistory;
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double lastMeasuredJitter = 0;
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double lastMeasuredDelay = 0;
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int outstandingDelayChange = 0;
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unsigned int dontChangeDelayFor = 0;
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double avgDelay = 0;
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bool first = true;
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#ifdef TGVOIP_DUMP_JITTER_STATS
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FILE *dump;
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#endif
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};
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} // namespace tgvoip
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#endif //LIBTGVOIP_JITTERBUFFER_H
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