添加rtp ext: av1-rtp-spec (#2609)

Co-authored-by: xia-chu <771730766@qq.com>

webrtc/RtpExt.cpp

@@ -94,6 +94,7 @@ uint8_t RtpExtOneByte::getId() const {
 }
 
 void RtpExtOneByte::setId(uint8_t in) {
+    CHECK(in < (int)RtpExtType::reserved);
     id = in & 0x0F;
 }
 
@@ -143,8 +144,6 @@ void appendExt(map<uint8_t, RtpExt> &ret, uint8_t *ptr, const uint8_t *end) {
             ++ptr;
             continue;
         }
-        //15类型的rtp ext为保留
-        CHECK(ext->getId() < (uint8_t) RtpExtType::reserved);
         CHECK(reinterpret_cast<uint8_t *>(ext) + Type::kMinSize <= end);
         CHECK(ext->getData() + ext->getSize() <= end);
         ret.emplace(ext->getId(), RtpExt(ext, isOneByteExt<Type>(), reinterpret_cast<char *>(ext->getData()), ext->getSize()));
@@ -522,8 +521,13 @@ uint8_t RtpExt::getFramemarkingTID() const {
 }
 
 void RtpExt::setExtId(uint8_t ext_id) {
-    assert(ext_id > (int) RtpExtType::padding && ext_id <= (int) RtpExtType::reserved && _ext);
+    assert(ext_id > (int) RtpExtType::padding && _ext);
     if (_one_byte_ext) {
+        if (ext_id >= (int)RtpExtType::reserved) {
+            WarnL << "One byte rtp ext can not store id " << (int)ext_id << "(" << getExtName((RtpExtType)ext_id) << ") big than 14";
+            clearExt();
+            return;
+        }
         auto ptr = reinterpret_cast<RtpExtOneByte *>(_ext);
         ptr->setId(ext_id);
     } else {

webrtc/RtpExt.h

@@ -34,6 +34,7 @@ namespace mediakit {
     XX(playout_delay,               "http://www.webrtc.org/experiments/rtp-hdrext/playout-delay") \
     XX(video_orientation,           "urn:3gpp:video-orientation") \
     XX(toffset,                     "urn:ietf:params:rtp-hdrext:toffset") \
+    XX(av1,                         "https://aomediacodec.github.io/av1-rtp-spec/#dependency-descriptor-rtp-header-extension") \
     XX(encrypt,                     "urn:ietf:params:rtp-hdrext:encrypt")
 
 enum class RtpExtType : uint8_t {
@@ -41,7 +42,7 @@ enum class RtpExtType : uint8_t {
 #define XX(type, uri) type,
     RTP_EXT_MAP(XX)
 #undef XX
-    reserved = encrypt,
+    reserved = 15,
 };
 
 class RtcMedia;