[Cast] Clean-up: Move max_unacked_frames into CongestionControl.

media/cast/sender/congestion_control_unittest.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 <stdint.h>
 
 #include "base/bind.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "media/cast/cast_defines.h"
 #include "media/cast/sender/congestion_control.h"
 #include "media/cast/test/fake_single_thread_task_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 namespace cast {
 
 static const uint32 kMaxBitrateConfigured = 5000000;
 static const uint32 kMinBitrateConfigured = 500000;
+static const int64 kFrameDelayMs = 33;
+static const double kMaxFrameRate = 1000.0 / kFrameDelayMs;
 static const int64 kStartMillisecond = INT64_C(12345678900000);
 static const double kTargetEmptyBufferFraction = 0.9;
 
 class CongestionControlTest : public ::testing::Test {
  protected:
   CongestionControlTest()
       : task_runner_(new test::FakeSingleThreadTaskRunner(&testing_clock_)) {
     testing_clock_.Advance(
         base::TimeDelta::FromMilliseconds(kStartMillisecond));
     congestion_control_.reset(NewAdaptiveCongestionControl(
-        &testing_clock_, kMaxBitrateConfigured, kMinBitrateConfigured, 10));
+        &testing_clock_, kMaxBitrateConfigured, kMinBitrateConfigured,
+        kMaxFrameRate));
+    const int max_unacked_frames = 10;
+    const base::TimeDelta target_playout_delay =
+        (max_unacked_frames - 1) * base::TimeDelta::FromSeconds(1) /
+        kMaxFrameRate;
+    congestion_control_->UpdateTargetPlayoutDelay(target_playout_delay);
   }
 
   void AckFrame(uint32 frame_id) {
     congestion_control_->AckFrame(frame_id, testing_clock_.NowTicks());
   }
 
   void Run(uint32 frames,
            size_t frame_size,
            base::TimeDelta rtt,
            base::TimeDelta frame_delay,
@@ skipping 13 matching lines @@
 
   base::SimpleTestTickClock testing_clock_;
   scoped_ptr<CongestionControl> congestion_control_;
   scoped_refptr<test::FakeSingleThreadTaskRunner> task_runner_;
   uint32 frame_id_;
 
   DISALLOW_COPY_AND_ASSIGN(CongestionControlTest);
 };
 
 TEST_F(CongestionControlTest, SimpleRun) {
-  uint32 frame_delay = 33;
   uint32 frame_size = 10000 * 8;
   Run(500,
       frame_size,
       base::TimeDelta::FromMilliseconds(10),
-      base::TimeDelta::FromMilliseconds(frame_delay),
+      base::TimeDelta::FromMilliseconds(kFrameDelayMs),
       base::TimeDelta::FromMilliseconds(45));
   // Empty the buffer.
   task_runner_->Sleep(base::TimeDelta::FromMilliseconds(100));
 
-  uint32 safe_bitrate = frame_size * 1000 / frame_delay;
+  uint32 safe_bitrate = frame_size * 1000 / kFrameDelayMs;
   uint32 bitrate = congestion_control_->GetBitrate(
       testing_clock_.NowTicks() + base::TimeDelta::FromMilliseconds(300),
       base::TimeDelta::FromMilliseconds(300));
   EXPECT_NEAR(
       safe_bitrate / kTargetEmptyBufferFraction, bitrate, safe_bitrate * 0.05);
 
   bitrate = congestion_control_->GetBitrate(
       testing_clock_.NowTicks() + base::TimeDelta::FromMilliseconds(200),
       base::TimeDelta::FromMilliseconds(300));
   EXPECT_NEAR(safe_bitrate / kTargetEmptyBufferFraction * 2 / 3,
@@ skipping 28 matching lines @@
       testing_clock_.NowTicks() + base::TimeDelta::FromMilliseconds(300),
       base::TimeDelta::FromMilliseconds(300));
   EXPECT_NEAR(safe_bitrate / kTargetEmptyBufferFraction * 1 / 3,
               bitrate,
               safe_bitrate * 0.05);
 }
 
 
 }  // namespace cast
 }  // namespace media