修复rtmp点播移动时间轴相关bug

src/MediaFile/Stamp.cpp

@@ -49,7 +49,7 @@ void Stamp::revise(uint32_t dts, uint32_t pts, int64_t &dts_out, int64_t &pts_ou
 
     //相对时间戳
     dts_out = dts - _start_dts;
-    if(dts_out < _dts_inc){
+    if(dts_out < _dts_inc && !_playback){
         //本次相对时间戳竟然小于上次？
         if(dts_out < 0 || _dts_inc - dts_out > 0xFFFF){
             //时间戳回环,保证下次相对时间戳与本次相对合理增长
@@ -77,4 +77,8 @@ void Stamp::revise(uint32_t dts, uint32_t pts, int64_t &dts_out, int64_t &pts_ou
     }
 }
 
+void Stamp::setPlayBack(bool playback) {
+    _playback = playback;
+}
+
 }//namespace mediakit

src/MediaFile/Stamp.h

@@ -39,8 +39,23 @@ class Stamp {
 public:
     Stamp() = default;
     ~Stamp() = default;
+
+    /**
+     * 设置回放模式，回放模式时间戳可以回退
+     * @param playback 是否为回放模式
+     */
+    void setPlayBack(bool playback = true);
+
+    /**
+     * 修正时间戳
+     * @param dts 输入dts，如果为0则根据系统时间戳生成
+     * @param pts 输入pts，如果为0则等于dts
+     * @param dts_out 输出dts
+     * @param pts_out 输出pts
+     */
     void revise(uint32_t dts, uint32_t pts, int64_t &dts_out, int64_t &pts_out);
 private:
+    bool _playback = false;
     int64_t _start_dts = 0;
     int64_t _dts_inc = 0;
     bool _first = true;

src/Rtmp/RtmpSession.cpp

@@ -464,6 +464,8 @@ void RtmpSession::onCmd_seek(AMFDecoder &dec) {
     InfoP(this) << "rtmp seekTo(ms):" << milliSeconds;
     auto stongSrc = _pPlayerSrc.lock();
     if (stongSrc) {
+        _stamp[0].setPlayBack();
+        _stamp[1].setPlayBack();
         stongSrc->seekTo(milliSeconds);
     }
 	AMFValue status(AMF_OBJECT);