Cast: Refactor RTCP handling

media/cast/sender/frame_sender.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/cast/sender/frame_sender.h"
+
+namespace media {
+namespace cast {
+namespace {
+const int kMinSchedulingDelayMs = 1;
+}  // namespace
+
+FrameSender::FrameSender(scoped_refptr<CastEnvironment> cast_environment,
+                         CastTransportSender* const transport_sender,
+                         base::TimeDelta rtcp_interval,
+                         int frequency,
+                         uint32 ssrc)
+    : cast_environment_(cast_environment),
+      transport_sender_(transport_sender),
+      rtp_timestamp_helper_(frequency),
+      rtt_available_(false),
+      rtcp_interval_(rtcp_interval),
+      ssrc_(ssrc),
+      weak_factory_(this) {
+}
+
+FrameSender::~FrameSender() {
+}
+
+void FrameSender::ScheduleNextRtcpReport() {
+  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
+  base::TimeDelta time_to_next = rtcp_interval_;
+
+  time_to_next = std::max(
+      time_to_next, base::TimeDelta::FromMilliseconds(kMinSchedulingDelayMs));
+
+  cast_environment_->PostDelayedTask(
+      CastEnvironment::MAIN,
+      FROM_HERE,
+      base::Bind(&FrameSender::SendRtcpReport, weak_factory_.GetWeakPtr(),
+                 true),
+      time_to_next);
+}
+
+void FrameSender::SendRtcpReport(bool schedule_future_reports) {
+  DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
+  const base::TimeTicks now = cast_environment_->Clock()->NowTicks();
+  uint32 now_as_rtp_timestamp = 0;
+  if (rtp_timestamp_helper_.GetCurrentTimeAsRtpTimestamp(
+          now, &now_as_rtp_timestamp)) {
+    transport_sender_->SendSenderReport(ssrc_, now, now_as_rtp_timestamp);
+  } else {
+    // |rtp_timestamp_helper_| should have stored a mapping by this point.
+    NOTREACHED();
+  }
+  if (schedule_future_reports)
+    ScheduleNextRtcpReport();
+}
+
+void FrameSender::OnReceivedRtt(base::TimeDelta rtt,
+                                base::TimeDelta avg_rtt,
+                                base::TimeDelta min_rtt,
+                                base::TimeDelta max_rtt) {
+  rtt_available_ = true;
+  rtt_ = rtt;
+  avg_rtt_ = avg_rtt;
+  min_rtt_ = min_rtt;
+  max_rtt_ = max_rtt;
+}
+
+}  // namespace cast
+}  // namespace media