完善rtcp ext

src/Rtsp/Rtsp.cpp

@@ -458,18 +458,27 @@ size_t RtpHeader::getExtSize() const {
         return 0;
     }
     auto ext_ptr = &payload + getCsrcSize();
-    uint16_t reserved = AV_RB16(ext_ptr);
+    //uint16_t reserved = AV_RB16(ext_ptr);
     //每个ext占用4字节
     return AV_RB16(ext_ptr + 2) << 2;
 }
 
+uint16_t RtpHeader::getExtReserved() const{
+    //rtp有ext
+    if (!ext) {
+        return 0;
+    }
+    auto ext_ptr = &payload + getCsrcSize();
+    return AV_RB16(ext_ptr);
+}
+
 uint8_t *RtpHeader::getExtData() {
     if (!ext) {
         return nullptr;
     }
     auto ext_ptr = &payload + getCsrcSize();
     //多出的4个字节分别为reserved、ext_len
-    return ext_ptr + 4 + getExtSize();
+    return ext_ptr + 4;
 }
 
 size_t RtpHeader::getPayloadOffset() const {

src/Rtsp/Rtsp.h

@@ -119,6 +119,8 @@ public:
 
     //返回ext字段字节长度
     size_t getExtSize() const;
+    //返回ext reserved值
+    uint16_t getExtReserved() const;
     //返回ext段首地址，不存在时返回nullptr
     uint8_t *getExtData();