RTC: Refine NACK check, interval, time

trunk/src/app/srs_app_rtc_conn.cpp

@@ -2295,8 +2295,7 @@ void SrsRtcConnection::check_send_nacks(SrsRtpNackForReceiver* nack, uint32_t ss
     rtcpNack.set_media_ssrc(ssrc);
     nack->get_nack_seqs(rtcpNack, timeout_nacks);
 
-    sent_nacks = rtcpNack.get_lost_sns().size();
-    if(!sent_nacks){
+    if(rtcpNack.empty()){
         return;
     }
 

trunk/src/app/srs_app_rtc_queue.cpp

@@ -190,7 +190,7 @@ SrsNackOption::SrsNackOption()
     max_nack_interval = 500 * SRS_UTIME_MILLISECONDS;
     min_nack_interval = 20 * SRS_UTIME_MILLISECONDS;
 
-    nack_check_interval = 3 * SRS_UTIME_MILLISECONDS;
+    nack_check_interval = 20 * SRS_UTIME_MILLISECONDS;
 
     //TODO: FIXME: audio and video using diff nack strategy
     // video:
@@ -259,8 +259,7 @@ void SrsRtpNackForReceiver::check_queue_size()
 
 void SrsRtpNackForReceiver::get_nack_seqs(SrsRtcpNack& seqs, uint32_t& timeout_nacks)
 {
-    // TODO: FIXME: Use packet as tick count, not clock.
-    srs_utime_t now = srs_update_system_time();
+    srs_utime_t now = srs_get_system_time();
 
     srs_utime_t interval = now - pre_check_time_;
     if (interval < opts_.nack_check_interval) {

trunk/src/kernel/srs_kernel_rtc_rtcp.cpp

@@ -1212,6 +1212,11 @@ vector<uint16_t> SrsRtcpNack::get_lost_sns() const
     return sn;
 }
 
+bool SrsRtcpNack::empty()
+{
+    return lost_sns_.empty();
+}
+
 void SrsRtcpNack::set_media_ssrc(uint32_t ssrc)
 {
     media_ssrc_ = ssrc;

trunk/src/kernel/srs_kernel_rtc_rtcp.hpp

@@ -345,6 +345,7 @@ public:
 
     uint32_t get_media_ssrc() const;
     std::vector<uint16_t> get_lost_sns() const;
+    bool empty();
 
     void set_media_ssrc(uint32_t ssrc);
     void add_lost_sn(uint16_t sn);