Implement timing frames.

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 226 matching lines @@
   }
   return false;
 }
 
 bool VideoContentTypeExtension::Write(uint8_t* data,
                                       VideoContentType content_type) {
   data[0] = static_cast<uint8_t>(content_type);
   return true;
 }
 
+// Video Timing.
+// 5 timestamps in milliseconds counted from capture time stored in rtp header:
+// ecode start/finish, packetization complete, pacer exit and reserved for
+// modification by the network modification.
+//    0                   1                   2                   3
+//    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
+//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//   |  ID   | len=9 |  encode start ms delta          | encode finish |
+//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//   | ms delta      |  packetizer finish ms delta     |   pacer exit  |
+//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//   | ms delta      |  network timestamp ms delta     |               |
+//   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+constexpr RTPExtensionType VideoTimingExtension::kId;
+constexpr uint8_t VideoTimingExtension::kValueSizeBytes;
+constexpr const char* VideoTimingExtension::kUri;
+
+bool VideoTimingExtension::Parse(rtc::ArrayView<const uint8_t> data,
+                                 VideoTiming* timing) {
+  RTC_DCHECK(timing);
+  if (data.size() != 10)
+    return false;
+  timing->encode_start_ms_delta =
+      ByteReader<uint16_t>::ReadBigEndian(data.data());
+  timing->encode_finish_ms_delta = ByteReader<uint16_t, 2>::ReadBigEndian(
+      data.data() + 2 * VideoTiming::kEncodeFinishIdx);
+  timing->packetization_finish_ms_delta =
+      ByteReader<uint16_t>::ReadBigEndian(
+          data.data() + 2 * VideoTiming::kPacketizationFinishDeltaIdx);
+  timing->pacer_exit_ms_delta = ByteReader<uint16_t, 2>::ReadBigEndian(
+      data.data() + 2 * VideoTiming::kPacerExitDeltaIdx);
+  timing->network_timstamp_ms_delta = ByteReader<uint16_t, 2>::ReadBigEndian(
+      data.data() + 2 * VideoTiming::kNetworkTimestampDeltaIdx);
+  timing->is_timing_frame = true;
+  return true;
+}
+
+bool VideoTimingExtension::Write(uint8_t* data, const VideoTiming& timing) {
+  ByteWriter<uint16_t>::WriteBigEndian(data, timing.encode_start_ms_delta);
+  ByteWriter<uint16_t>::WriteBigEndian(
+      data + 2 * VideoTiming::kEncodeFinishIdx, timing.encode_finish_ms_delta);
+  ByteWriter<uint16_t>::WriteBigEndian(
+      data + 2 * VideoTiming::kPacketizationFinishDeltaIdx,
+      timing.packetization_finish_ms_delta);
+  ByteWriter<uint16_t>::WriteBigEndian(
+      data + 2 * VideoTiming::kPacerExitDeltaIdx, timing.pacer_exit_ms_delta);
+  ByteWriter<uint16_t>::WriteBigEndian(
+      data + 2 * VideoTiming::kNetworkTimestampDeltaIdx, 0);  // reserved
+  return true;
+}
+
+bool VideoTimingExtension::Write(uint8_t* data,
+                                 uint16_t time_delta_ms,
+                                 uint8_t idx) {
+  RTC_DCHECK_LT(idx, 5);
+  ByteWriter<uint16_t>::WriteBigEndian(data + 2 * idx, time_delta_ms);
+  return true;
+}
+
 // RtpStreamId.
 constexpr RTPExtensionType RtpStreamId::kId;
 constexpr const char* RtpStreamId::kUri;
 
 bool RtpStreamId::Parse(rtc::ArrayView<const uint8_t> data, StreamId* rsid) {
   if (data.empty() || data[0] == 0)  // Valid rsid can't be empty.
     return false;
   rsid->Set(data);
   RTC_DCHECK(!rsid->empty());
   return true;
@@ skipping 49 matching lines @@
 
 size_t RepairedRtpStreamId::ValueSize(const std::string& rsid) {
   return RtpStreamId::ValueSize(rsid);
 }
 
 bool RepairedRtpStreamId::Write(uint8_t* data, const std::string& rsid) {
   return RtpStreamId::Write(data, rsid);
 }
 
 }  // namespace webrtc