Add read support of RtpStreamId/RepairedRtpStreamId header extensions.

webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 197 matching lines @@
   RTC_DCHECK_LE(0, playout_delay.min_ms);
   RTC_DCHECK_LE(playout_delay.min_ms, playout_delay.max_ms);
   RTC_DCHECK_LE(playout_delay.max_ms, kMaxMs);
   // Convert MS to value to be sent on extension header.
   uint32_t min_delay = playout_delay.min_ms / kGranularityMs;
   uint32_t max_delay = playout_delay.max_ms / kGranularityMs;
   ByteWriter<uint32_t, 3>::WriteBigEndian(data, (min_delay << 12) | max_delay);
   return true;
 }
 
+// RtpStreamId.
+constexpr RTPExtensionType RtpStreamId::kId;
+constexpr uint8_t RtpStreamId::kValueSizeBytes;
+constexpr const char* RtpStreamId::kUri;
+
+bool RtpStreamId::Parse(rtc::ArrayView<const uint8_t> data, std::string* rid) {
+  if (data.empty())
+    return false;
+  rid->assign(reinterpret_cast<const char*>(data.data()), data.size());
+  return true;
+}
+
+// RepairRtpStreamId.
+constexpr RTPExtensionType RepairRtpStreamId::kId;
+constexpr uint8_t RepairRtpStreamId::kValueSizeBytes;
+constexpr const char* RepairRtpStreamId::kUri;
+
+bool RepairRtpStreamId::Parse(rtc::ArrayView<const uint8_t> data,
+                              std::string* rid) {
+  if (data.empty())
+    return false;
+  rid->assign(reinterpret_cast<const char*>(data.data()), data.size());
+  return true;
+}
+
 }  // namespace webrtc