修复除0的bug

src/Common/Stamp.cpp

@@ -219,6 +219,7 @@ bool DtsGenerator::getDts_l(uint32_t pts, uint32_t &dts){
 }
 
 void NtpStamp::setNtpStamp(uint32_t rtp_stamp, uint32_t sample_rate, uint64_t ntp_stamp_ms) {
+    assert(sample_rate);
     update(uint64_t(rtp_stamp) * 1000 / sample_rate, ntp_stamp_ms);
 }
 

src/Rtsp/RtpReceiver.cpp

@@ -103,7 +103,9 @@ RtpPacket::Ptr RtpTrack::inputRtp(TrackType type, int sample_rate, uint8_t *ptr,
 
 void RtpTrack::setNtpStamp(uint32_t rtp_stamp, uint32_t sample_rate, uint64_t ntp_stamp_ms) {
     _disable_ntp = rtp_stamp == 0 && sample_rate == 0 && ntp_stamp_ms == 0;
+    if (sample_rate) {
         _ntp_stamp.setNtpStamp(rtp_stamp, sample_rate, ntp_stamp_ms);
+    }
 }
 
 ////////////////////////////////////////////////////////////////////////////////////