mirror of
https://github.com/danog/libtgvoip.git
synced 2024-11-27 04:34:42 +01:00
456 lines
12 KiB
C++
Executable File
456 lines
12 KiB
C++
Executable File
//
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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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#include "VoIPController.h"
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#include "JitterBuffer.h"
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#include "logging.h"
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#include "VoIPServerConfig.h"
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#include <math.h>
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using namespace tgvoip;
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JitterBuffer::JitterBuffer(MediaStreamItf *out, uint32_t step){
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if(out)
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out->SetCallback(JitterBuffer::CallbackOut, this);
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this->step=step;
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memset(slots, 0, sizeof(jitter_packet_t)*JITTER_SLOT_COUNT);
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if(step<30){
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minMinDelay=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_min_delay_20", 6);
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maxMinDelay=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_max_delay_20", 25);
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maxUsedSlots=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_max_slots_20", 50);
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}else if(step<50){
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minMinDelay=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_min_delay_40", 4);
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maxMinDelay=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_max_delay_40", 15);
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maxUsedSlots=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_max_slots_40", 30);
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}else{
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minMinDelay=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_min_delay_60", 2);
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maxMinDelay=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_max_delay_60", 10);
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maxUsedSlots=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_max_slots_60", 20);
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}
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lossesToReset=(uint32_t) ServerConfig::GetSharedInstance()->GetInt("jitter_losses_to_reset", 20);
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resyncThreshold=ServerConfig::GetSharedInstance()->GetDouble("jitter_resync_threshold", 1.0);
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#ifdef TGVOIP_DUMP_JITTER_STATS
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#ifdef TGVOIP_JITTER_DUMP_FILE
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dump=fopen(TGVOIP_JITTER_DUMP_FILE, "w");
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#elif defined(__ANDROID__)
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dump=fopen("/sdcard/tgvoip_jitter_dump.txt", "w");
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#else
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dump=fopen("tgvoip_jitter_dump.txt", "w");
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#endif
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tgvoip_log_file_write_header(dump);
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fprintf(dump, "PTS\tRTS\tNumInBuf\tAJitter\tADelay\tTDelay\n");
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#endif
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Reset();
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}
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JitterBuffer::~JitterBuffer(){
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Reset();
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}
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void JitterBuffer::SetMinPacketCount(uint32_t count){
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LOGI("jitter: set min packet count %u", count);
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minDelay=count;
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minMinDelay=count;
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//Reset();
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}
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int JitterBuffer::GetMinPacketCount(){
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return (int)minDelay;
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}
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size_t JitterBuffer::CallbackIn(unsigned char *data, size_t len, void *param){
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//((JitterBuffer*)param)->HandleInput(data, len);
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return 0;
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}
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size_t JitterBuffer::CallbackOut(unsigned char *data, size_t len, void *param){
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return 0; //((JitterBuffer*)param)->HandleOutput(data, len, 0, NULL);
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}
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void JitterBuffer::HandleInput(unsigned char *data, size_t len, uint32_t timestamp, bool isEC){
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MutexGuard m(mutex);
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jitter_packet_t pkt;
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pkt.size=len;
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pkt.buffer=Buffer::Wrap(data, len, [](void*){}, [](void* a, size_t)->void*{return a;});
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pkt.timestamp=timestamp;
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pkt.isEC=isEC;
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PutInternal(&pkt, !isEC);
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//LOGV("in, ts=%d, ec=%d", timestamp, isEC);
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}
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void JitterBuffer::Reset(){
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wasReset=true;
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needBuffering=true;
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lastPutTimestamp=0;
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int i;
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for(i=0;i<JITTER_SLOT_COUNT;i++){
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if(!slots[i].buffer.IsEmpty()){
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slots[i].buffer=Buffer();
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}
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}
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delayHistory.Reset();
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lateHistory.Reset();
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adjustingDelay=false;
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lostSinceReset=0;
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gotSinceReset=0;
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expectNextAtTime=0;
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deviationHistory.Reset();
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outstandingDelayChange=0;
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dontChangeDelay=0;
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}
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size_t JitterBuffer::HandleOutput(unsigned char *buffer, size_t len, int offsetInSteps, bool advance, int& playbackScaledDuration, bool& isEC){
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jitter_packet_t pkt;
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pkt.buffer=Buffer::Wrap(buffer, len, [](void*){}, [](void* a, size_t)->void*{return a;});
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pkt.size=len;
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MutexGuard m(mutex);
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if(first){
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first=false;
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unsigned int delay=GetCurrentDelay();
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if(GetCurrentDelay()>5){
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LOGW("jitter: delay too big upon start (%u), dropping packets", delay);
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while(delay>GetMinPacketCount()){
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for(int i=0;i<JITTER_SLOT_COUNT;i++){
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if(slots[i].timestamp==nextTimestamp){
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if(!slots[i].buffer.IsEmpty()){
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slots[i].buffer=Buffer();
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}
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break;
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}
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}
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Advance();
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delay--;
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}
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}
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}
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int result=GetInternal(&pkt, offsetInSteps, advance);
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if(outstandingDelayChange!=0){
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if(outstandingDelayChange<0){
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playbackScaledDuration=40;
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outstandingDelayChange+=20;
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}else{
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playbackScaledDuration=80;
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outstandingDelayChange-=20;
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}
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//LOGV("outstanding delay change: %d", outstandingDelayChange);
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}else if(advance && GetCurrentDelay()==0){
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//LOGV("stretching packet because the next one is late");
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playbackScaledDuration=80;
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}else{
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playbackScaledDuration=60;
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}
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if(result==JR_OK){
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isEC=pkt.isEC;
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return pkt.size;
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}else{
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return 0;
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}
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}
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int JitterBuffer::GetInternal(jitter_packet_t* pkt, int offset, bool advance){
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/*if(needBuffering && lastPutTimestamp<nextTimestamp){
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LOGV("jitter: don't have timestamp %lld, buffering", (long long int)nextTimestamp);
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Advance();
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return JR_BUFFERING;
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}*/
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//needBuffering=false;
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int64_t timestampToGet=nextTimestamp+offset*(int32_t)step;
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int i;
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for(i=0;i<JITTER_SLOT_COUNT;i++){
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if(!slots[i].buffer.IsEmpty() && slots[i].timestamp==timestampToGet){
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break;
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}
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}
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if(i<JITTER_SLOT_COUNT){
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if(pkt && pkt->size<slots[i].size){
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LOGE("jitter: packet won't fit into provided buffer of %d (need %d)", int(slots[i].size), int(pkt->size));
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}else{
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if(pkt) {
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pkt->size = slots[i].size;
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pkt->timestamp = slots[i].timestamp;
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pkt->buffer.CopyFrom(slots[i].buffer, slots[i].size);
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pkt->isEC=slots[i].isEC;
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}
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}
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slots[i].buffer=Buffer();
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if(offset==0)
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Advance();
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lostCount=0;
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needBuffering=false;
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return JR_OK;
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}
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LOGV("jitter: found no packet for timestamp %lld (last put = %d, lost = %d)", (long long int)timestampToGet, lastPutTimestamp, lostCount);
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if(advance)
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Advance();
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if(!needBuffering){
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lostCount++;
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if(offset==0){
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lostPackets++;
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lostSinceReset++;
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}
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if(lostCount>=lossesToReset || (gotSinceReset>minDelay*25 && lostSinceReset>gotSinceReset/2)){
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LOGW("jitter: lost %d packets in a row, resetting", lostCount);
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//minDelay++;
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dontIncMinDelay=16;
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dontDecMinDelay+=128;
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if(GetCurrentDelay()<minDelay)
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nextTimestamp-=(int64_t)(minDelay-GetCurrentDelay());
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lostCount=0;
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Reset();
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}
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return JR_MISSING;
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}
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return JR_BUFFERING;
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}
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void JitterBuffer::PutInternal(jitter_packet_t* pkt, bool overwriteExisting){
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if(pkt->size>JITTER_SLOT_SIZE){
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LOGE("The packet is too big to fit into the jitter buffer");
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return;
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}
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int i;
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for(i=0;i<JITTER_SLOT_COUNT;i++){
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if(!slots[i].buffer.IsEmpty() && slots[i].timestamp==pkt->timestamp){
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//LOGV("Found existing packet for timestamp %u, overwrite %d", pkt->timestamp, overwriteExisting);
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if(overwriteExisting){
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slots[i].buffer.CopyFrom(pkt->buffer, pkt->size);
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slots[i].size=pkt->size;
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slots[i].isEC=pkt->isEC;
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}
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return;
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}
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}
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gotSinceReset++;
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if(wasReset){
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wasReset=false;
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outstandingDelayChange=0;
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nextTimestamp=(int64_t)(((int64_t)pkt->timestamp)-step*minDelay);
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first=true;
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LOGI("jitter: resyncing, next timestamp = %lld (step=%d, minDelay=%f)", (long long int)nextTimestamp, step, minDelay);
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}
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for(i=0;i<JITTER_SLOT_COUNT;i++){
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if(!slots[i].buffer.IsEmpty()){
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if(slots[i].timestamp<nextTimestamp-1){
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slots[i].buffer=Buffer();
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}
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}
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}
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/*double prevTime=0;
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uint32_t closestTime=0;
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for(i=0;i<JITTER_SLOT_COUNT;i++){
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if(slots[i].buffer!=NULL && pkt->timestamp-slots[i].timestamp<pkt->timestamp-closestTime){
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closestTime=slots[i].timestamp;
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prevTime=slots[i].recvTime;
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}
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}*/
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double time=VoIPController::GetCurrentTime();
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if(expectNextAtTime!=0){
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double dev=expectNextAtTime-time;
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//LOGV("packet dev %f", dev);
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deviationHistory.Add(dev);
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expectNextAtTime+=step/1000.0;
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}else{
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expectNextAtTime=time+step/1000.0;
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}
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if(pkt->timestamp<nextTimestamp){
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//LOGW("jitter: would drop packet with timestamp %d because it is late but not hopelessly", pkt->timestamp);
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latePacketCount++;
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lostPackets--;
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}else if(pkt->timestamp<nextTimestamp-1){
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//LOGW("jitter: dropping packet with timestamp %d because it is too late", pkt->timestamp);
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latePacketCount++;
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return;
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}
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if(pkt->timestamp>lastPutTimestamp)
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lastPutTimestamp=pkt->timestamp;
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for(i=0;i<JITTER_SLOT_COUNT;i++){
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if(slots[i].buffer.IsEmpty())
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break;
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}
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if(i==JITTER_SLOT_COUNT || GetCurrentDelay()>=maxUsedSlots){
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int toRemove=JITTER_SLOT_COUNT;
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uint32_t bestTimestamp=0xFFFFFFFF;
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for(i=0;i<JITTER_SLOT_COUNT;i++){
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if(!slots[i].buffer.IsEmpty() && slots[i].timestamp<bestTimestamp){
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toRemove=i;
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bestTimestamp=slots[i].timestamp;
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}
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}
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Advance();
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slots[toRemove].buffer=Buffer();
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i=toRemove;
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}
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slots[i].timestamp=pkt->timestamp;
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slots[i].size=pkt->size;
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slots[i].buffer=bufferPool.Get();
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slots[i].recvTimeDiff=time-prevRecvTime;
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slots[i].isEC=pkt->isEC;
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slots[i].buffer.CopyFrom(pkt->buffer, pkt->size);
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#ifdef TGVOIP_DUMP_JITTER_STATS
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fprintf(dump, "%u\t%.03f\t%d\t%.03f\t%.03f\t%.03f\n", pkt->timestamp, time, GetCurrentDelay(), lastMeasuredJitter, lastMeasuredDelay, minDelay);
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#endif
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prevRecvTime=time;
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}
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void JitterBuffer::Advance(){
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nextTimestamp+=step;
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}
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unsigned int JitterBuffer::GetCurrentDelay(){
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unsigned int delay=0;
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int i;
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for(i=0;i<JITTER_SLOT_COUNT;i++){
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if(!slots[i].buffer.IsEmpty())
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delay++;
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}
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return delay;
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}
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void JitterBuffer::Tick(){
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MutexGuard m(mutex);
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int i;
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lateHistory.Add(latePacketCount);
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latePacketCount=0;
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bool absolutelyNoLatePackets=lateHistory.Max()==0;
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double avgLate16=lateHistory.Average(16);
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//LOGV("jitter: avg late=%.1f, %.1f, %.1f", avgLate16, avgLate32, avgLate64);
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if(avgLate16>=resyncThreshold){
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LOGV("resyncing: avgLate16=%f, resyncThreshold=%f", avgLate16, resyncThreshold);
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wasReset=true;
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}
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if(absolutelyNoLatePackets){
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if(dontDecMinDelay>0)
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dontDecMinDelay--;
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}
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delayHistory.Add(GetCurrentDelay());
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avgDelay=delayHistory.Average(32);
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double stddev=0;
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double avgdev=deviationHistory.Average();
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for(i=0;i<64;i++){
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double d=(deviationHistory[i]-avgdev);
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stddev+=(d*d);
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}
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stddev=sqrt(stddev/64);
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uint32_t stddevDelay=(uint32_t)ceil(stddev*2*1000/step);
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if(stddevDelay<minMinDelay)
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stddevDelay=minMinDelay;
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if(stddevDelay>maxMinDelay)
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stddevDelay=maxMinDelay;
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if(stddevDelay!=minDelay){
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int32_t diff=(int32_t)(stddevDelay-minDelay);
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if(diff>0){
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dontDecMinDelay=100;
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}
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if(diff<-1)
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diff=-1;
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if(diff>1)
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diff=1;
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if((diff>0 && dontIncMinDelay==0) || (diff<0 && dontDecMinDelay==0)){
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//nextTimestamp+=diff*(int32_t)step;
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minDelay+=diff;
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outstandingDelayChange+=diff*60;
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dontChangeDelay+=32;
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//LOGD("new delay from stddev %f", minDelay);
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if(diff<0){
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dontDecMinDelay+=25;
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}
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if(diff>0){
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dontIncMinDelay=25;
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}
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}
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}
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lastMeasuredJitter=stddev;
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lastMeasuredDelay=stddevDelay;
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//LOGV("stddev=%.3f, avg=%.3f, ndelay=%d, dontDec=%u", stddev, avgdev, stddevDelay, dontDecMinDelay);
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if(dontChangeDelay==0){
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if(avgDelay>minDelay+0.5){
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outstandingDelayChange-=avgDelay>minDelay+2 ? 60 : 20;
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dontChangeDelay+=10;
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}else if(avgDelay<minDelay-0.3){
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outstandingDelayChange+=20;
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dontChangeDelay+=10;
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}
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}
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if(dontChangeDelay>0)
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dontChangeDelay--;
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//LOGV("jitter: avg delay=%d, delay=%d, late16=%.1f, dontDecMinDelay=%d", avgDelay, delayHistory[0], avgLate16, dontDecMinDelay);
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/*if(!adjustingDelay) {
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if (((minDelay==1 ? (avgDelay>=3) : (avgDelay>=minDelay/2)) && delayHistory[0]>minDelay && avgLate16<=0.1 && absolutelyNoLatePackets && dontDecMinDelay<32 && min>minDelay)) {
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LOGI("jitter: need adjust");
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adjustingDelay=true;
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}
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}else{
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if(!absolutelyNoLatePackets){
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LOGI("jitter: done adjusting because we're losing packets");
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adjustingDelay=false;
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}else if(tickCount%5==0){
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LOGD("jitter: removing a packet to reduce delay");
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GetInternal(NULL, 0);
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expectNextAtTime=0;
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if(GetCurrentDelay()<=minDelay || min<=minDelay){
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adjustingDelay = false;
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LOGI("jitter: done adjusting");
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}
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}
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}*/
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tickCount++;
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}
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void JitterBuffer::GetAverageLateCount(double *out){
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double avgLate64=lateHistory.Average(), avgLate32=lateHistory.Average(32), avgLate16=lateHistory.Average(16);
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out[0]=avgLate16;
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out[1]=avgLate32;
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out[2]=avgLate64;
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}
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int JitterBuffer::GetAndResetLostPacketCount(){
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MutexGuard m(mutex);
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int r=lostPackets;
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lostPackets=0;
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return r;
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}
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double JitterBuffer::GetLastMeasuredJitter(){
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return lastMeasuredJitter;
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}
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double JitterBuffer::GetLastMeasuredDelay(){
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return lastMeasuredDelay;
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}
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double JitterBuffer::GetAverageDelay(){
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return avgDelay;
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}
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