解决GB28181推流无ntp时间戳导致的问题

src/Rtp/GB28181Process.cpp

@@ -27,10 +27,13 @@ static inline bool checkTS(const uint8_t *packet, size_t bytes){
 class RtpReceiverImp : public RtpTrackImp {
 public:
     using Ptr = std::shared_ptr<RtpReceiverImp>;
-    RtpReceiverImp(int sample_rate, RtpTrackImp::OnSorted cb, RtpTrackImp::BeforeSorted cb_before = nullptr){
+
+    RtpReceiverImp(int sample_rate, RtpTrackImp::OnSorted cb, RtpTrackImp::BeforeSorted cb_before = nullptr) {
         _sample_rate = sample_rate;
         setOnSorted(std::move(cb));
         setBeforeSorted(std::move(cb_before));
+        //GB28181推流不支持ntp时间戳
+        setNtpStamp(0, 0, 0);
     }
 
     ~RtpReceiverImp() override = default;

src/Rtsp/RtpReceiver.cpp

@@ -89,14 +89,20 @@ RtpPacket::Ptr RtpTrack::inputRtp(TrackType type, int sample_rate, uint8_t *ptr,
     data[3] = len & 0xFF;
     //拷贝rtp
     memcpy(&data[4], ptr, len);
+    if (_disable_ntp) {
+        //不支持ntp时间戳，例如国标推流，那么直接使用rtp时间戳
+        rtp->ntp_stamp = rtp->getStamp() * uint64_t(1000) / sample_rate;
+    } else {
         //设置ntp时间戳
         rtp->ntp_stamp = _ntp_stamp.getNtpStamp(ntohl(rtp->getHeader()->stamp), sample_rate);
+    }
     onBeforeRtpSorted(rtp);
     sortPacket(rtp->getSeq(), rtp);
     return rtp;
 }
 
-void RtpTrack::setNtpStamp(uint32_t rtp_stamp, uint32_t sample_rate, uint64_t ntp_stamp_ms){
+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;
     _ntp_stamp.setNtpStamp(rtp_stamp, sample_rate, ntp_stamp_ms);
 }
 

src/Rtsp/RtpReceiver.h

@@ -183,6 +183,7 @@ protected:
     virtual void onBeforeRtpSorted(const RtpPacket::Ptr &rtp) {}
 
 private:
+    bool _disable_ntp = false;
     uint32_t _ssrc = 0;
     Ticker _ssrc_alive;
     NtpStamp _ntp_stamp;
@@ -241,6 +242,7 @@ public:
 
     /**
      * 设置ntp时间戳，在收到rtcp sender report时设置
+     * 如果rtp_stamp/sample_rate/ntp_stamp_ms都为0，那么采用rtp时间戳为ntp时间戳
      * @param index track下标索引
      * @param rtp_stamp rtp时间戳
      * @param sample_rate 时间戳采样率