Add content type information to encoded images and corresponding rtp extension header

webrtc/modules/include/module_common_types.h

 /*
  *  Copyright (c) 2012 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 40 matching lines @@
 };
 // Since RTPVideoHeader is used as a member of a union, it can't have a
 // non-trivial default constructor.
 struct RTPVideoHeader {
   uint16_t width;  // size
   uint16_t height;
   VideoRotation rotation;
 
   PlayoutDelay playout_delay;
 
+  VideoContentType content_type;
+
   union {
     bool is_first_packet_in_frame;
     RTC_DEPRECATED bool isFirstPacket;  // first packet in frame
   };
   uint8_t simulcastIdx;  // Index if the simulcast encoder creating
                          // this frame, 0 if not using simulcast.
   RtpVideoCodecTypes codec;
   RTPVideoTypeHeader codecHeader;
 };
 union RTPTypeHeader {
   RTPAudioHeader Audio;
   RTPVideoHeader Video;
 };
 
 struct WebRtcRTPHeader {
   RTPHeader header;
   FrameType frameType;
   RTPTypeHeader type;
   // NTP time of the capture time in local timebase in milliseconds.
   int64_t ntp_time_ms;
 };
 
 class RTPFragmentationHeader {
  public:
   RTPFragmentationHeader()
       : fragmentationVectorSize(0),
         fragmentationOffset(NULL),
         fragmentationLength(NULL),
         fragmentationTimeDiff(NULL),
-        fragmentationPlType(NULL) {};
+        fragmentationPlType(NULL) {}
 
   ~RTPFragmentationHeader() {
     delete[] fragmentationOffset;
     delete[] fragmentationLength;
     delete[] fragmentationTimeDiff;
     delete[] fragmentationPlType;
   }
 
   void CopyFrom(const RTPFragmentationHeader& src) {
     if (this == &src) {
@@ skipping 467 matching lines @@
   static constexpr int kNotAProbe = -1;
   int send_bitrate_bps = -1;
   int probe_cluster_id = kNotAProbe;
   int probe_cluster_min_probes = -1;
   int probe_cluster_min_bytes = -1;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_INCLUDE_MODULE_COMMON_TYPES_H_