Added log messages for important call setup events: first packet sent/received

webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc b/webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc
index 32ba26f54b88a5e9eaa6d2cf4d2c785aa857405e..2595edb1191904c3c86df6044985779838569bb6 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender_video.cc
@@ -43,7 +43,8 @@ RTPSenderVideo::RTPSenderVideo(Clock* clock, RTPSenderInterface* rtpSender)
       key_fec_params_(),
       producer_fec_(&fec_),
       _fecOverheadRate(clock, NULL),
-      _videoBitrate(clock, NULL) {
+      _videoBitrate(clock, NULL),
+      sent_first_frame_(false) {
   memset(&delta_fec_params_, 0, sizeof(delta_fec_params_));
   memset(&key_fec_params_, 0, sizeof(key_fec_params_));
   delta_fec_params_.max_fec_frames = key_fec_params_.max_fec_frames = 1;
@@ -232,6 +233,7 @@ int32_t RTPSenderVideo::SendVideo(const RtpVideoCodecTypes videoType,
 
   StorageType storage;
   bool fec_enabled;
+  bool first_frame = false;
   {
     CriticalSectionScoped cs(crit_.get());
     FecProtectionParams* fec_params =
@@ -239,6 +241,10 @@ int32_t RTPSenderVideo::SendVideo(const RtpVideoCodecTypes videoType,
     producer_fec_.SetFecParameters(fec_params, 0);
     storage = packetizer->GetStorageType(_retransmissionSettings);
     fec_enabled = fec_enabled_;
+    if (!sent_first_frame_) {
+      first_frame = true;
+      sent_first_frame_ = true;
+    }
   }
 
   // Register CVO rtp header extension at the first time when we receive a frame
@@ -260,6 +266,7 @@ int32_t RTPSenderVideo::SendVideo(const RtpVideoCodecTypes videoType,
 
   packetizer->SetPayloadData(data, payload_bytes_to_send, frag);
 
+  bool first = true;
   bool last = false;
   while (!last) {
     uint8_t dataBuffer[IP_PACKET_SIZE] = {0};
@@ -268,6 +275,7 @@ int32_t RTPSenderVideo::SendVideo(const RtpVideoCodecTypes videoType,
                                 &payload_bytes_in_packet, &last)) {
       return -1;
     }
+
     // Write RTP header.
     // Set marker bit true if this is the last packet in frame.
     _rtpSender.BuildRTPheader(
@@ -309,6 +317,18 @@ int32_t RTPSenderVideo::SendVideo(const RtpVideoCodecTypes videoType,
                       _rtpSender.SequenceNumber(), captureTimeStamp,
                       capture_time_ms, storage);
     }
+
+    if (first_frame) {
+      if (first) {
+        LOG(LS_INFO) <<
+          "Sent first RTP packet of the first video frame (pre-pacer)";
+      }
+      if (last) {
+        LOG(LS_INFO) <<
+          "Sent last RTP packet of the first video frame (pre-pacer)";
+      }
+    }
+    first = false;
   }
 
   TRACE_EVENT_ASYNC_END1(