Added log messages for some important call setup events:
- First audio RTP packet sent / received
- First RTP packet of the first video frame sent / received
- Last RTP packet of the first video frame sent / received
These timestamps should make it easier to measure how fast the call
becomes established from the user's perspective.
Review URL: https://codereview.webrtc.org/1765443002
Cr-Commit-Position: refs/heads/master@{#12287}
diff --git a/webrtc/base/onetimeevent.h b/webrtc/base/onetimeevent.h
new file mode 100644
index 0000000..9708b4b
--- /dev/null
+++ b/webrtc/base/onetimeevent.h
@@ -0,0 +1,62 @@
+/*
+ * 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.
+ */
+
+#ifndef WEBRTC_BASE_ONETIMEEVENT_H_
+#define WEBRTC_BASE_ONETIMEEVENT_H_
+
+#include "webrtc/base/scoped_ptr.h"
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+// Provides a simple way to perform an operation (such as logging) one
+// time in a certain scope.
+// Example:
+// OneTimeEvent firstFrame;
+// ...
+// if (firstFrame()) {
+// LOG(LS_INFO) << "This is the first frame".
+// }
+class OneTimeEvent {
+ public:
+ OneTimeEvent() {}
+ bool operator()() {
+ rtc::CritScope cs(&critsect_);
+ if (happened_) {
+ return false;
+ }
+ happened_ = true;
+ return true;
+ }
+
+ private:
+ bool happened_ = false;
+ rtc::CriticalSection critsect_;
+};
+
+// A non-thread-safe, ligher-weight version of the OneTimeEvent class.
+class ThreadUnsafeOneTimeEvent {
+ public:
+ ThreadUnsafeOneTimeEvent() {}
+ bool operator()() {
+ if (happened_) {
+ return false;
+ }
+ happened_ = true;
+ return true;
+ }
+
+ private:
+ bool happened_ = false;
+};
+
+} // namespace webrtc
+
+#endif // WEBRTC_BASE_ONETIMEEVENT_H_