Refactor/reimplement RTC event log triage alerts.

- Moves AnalyzerConfig and helper functions IsAudioSsrc, IsVideoSsrc, IsRtxSsrc, GetStreamNam and GetLayerName to analyzer_common.h
- Moves log_segments() code to rtc_event_log_parser.h
- Moves TriageAlert/Notification code to a new file with a couple of minor fixes to make it less spammy.

Bug: webrtc:11566
Change-Id: Ib33941d8185f7382fc72ed65768e46015e0320de
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/174824
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31318}

rtc_tools/rtc_event_log_visualizer/analyzer_common.cc

@@ -0,0 +1,83 @@
+
+/*
+ *  Copyright (c) 2020 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.
+ */
+
+#include "rtc_tools/rtc_event_log_visualizer/analyzer_common.h"
+
+namespace webrtc {
+
+bool IsRtxSsrc(const ParsedRtcEventLog& parsed_log,
+               PacketDirection direction,
+               uint32_t ssrc) {
+  if (direction == kIncomingPacket) {
+    return parsed_log.incoming_rtx_ssrcs().find(ssrc) !=
+           parsed_log.incoming_rtx_ssrcs().end();
+  } else {
+    return parsed_log.outgoing_rtx_ssrcs().find(ssrc) !=
+           parsed_log.outgoing_rtx_ssrcs().end();
+  }
+}
+
+bool IsVideoSsrc(const ParsedRtcEventLog& parsed_log,
+                 PacketDirection direction,
+                 uint32_t ssrc) {
+  if (direction == kIncomingPacket) {
+    return parsed_log.incoming_video_ssrcs().find(ssrc) !=
+           parsed_log.incoming_video_ssrcs().end();
+  } else {
+    return parsed_log.outgoing_video_ssrcs().find(ssrc) !=
+           parsed_log.outgoing_video_ssrcs().end();
+  }
+}
+
+bool IsAudioSsrc(const ParsedRtcEventLog& parsed_log,
+                 PacketDirection direction,
+                 uint32_t ssrc) {
+  if (direction == kIncomingPacket) {
+    return parsed_log.incoming_audio_ssrcs().find(ssrc) !=
+           parsed_log.incoming_audio_ssrcs().end();
+  } else {
+    return parsed_log.outgoing_audio_ssrcs().find(ssrc) !=
+           parsed_log.outgoing_audio_ssrcs().end();
+  }
+}
+
+std::string GetStreamName(const ParsedRtcEventLog& parsed_log,
+                          PacketDirection direction,
+                          uint32_t ssrc) {
+  char buffer[200];
+  rtc::SimpleStringBuilder name(buffer);
+  if (IsAudioSsrc(parsed_log, direction, ssrc)) {
+    name << "Audio ";
+  } else if (IsVideoSsrc(parsed_log, direction, ssrc)) {
+    name << "Video ";
+  } else {
+    name << "Unknown ";
+  }
+  if (IsRtxSsrc(parsed_log, direction, ssrc)) {
+    name << "RTX ";
+  }
+  if (direction == kIncomingPacket)
+    name << "(In) ";
+  else
+    name << "(Out) ";
+  name << "SSRC " << ssrc;
+  return name.str();
+}
+
+std::string GetLayerName(LayerDescription layer) {
+  char buffer[100];
+  rtc::SimpleStringBuilder name(buffer);
+  name << "SSRC " << layer.ssrc << " sl " << layer.spatial_layer << ", tl "
+       << layer.temporal_layer;
+  return name.str();
+}
+
+}  // namespace webrtc