Reland #2 of Issue 2434073003: Extract bitrate allocation ...

webrtc/modules/video_coding/utility/default_video_bitrate_allocator_unittest.cc

+/*
+ *  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.
+ */
+
+#include <limits>
+#include <memory>
+
+#include "webrtc/modules/video_coding/utility/default_video_bitrate_allocator.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+namespace {
+uint32_t kMaxBitrateBps = 1000000;
+uint32_t kMinBitrateBps = 50000;
+uint32_t kMaxFramerate = 30;
+}  // namespace
+
+class DefaultVideoBitrateAllocatorTest : public ::testing::Test {
+ public:
+  DefaultVideoBitrateAllocatorTest() {}
+  virtual ~DefaultVideoBitrateAllocatorTest() {}
+
+  void SetUp() override {
+    codec_.codecType = kVideoCodecVP8;
+    codec_.minBitrate = kMinBitrateBps / 1000;
+    codec_.maxBitrate = kMaxBitrateBps / 1000;
+    codec_.targetBitrate = (kMinBitrateBps + kMaxBitrateBps) / 2000;
+    codec_.maxFramerate = kMaxFramerate;
+    allocator_.reset(new DefaultVideoBitrateAllocator(codec_));
+  }
+
+ protected:
+  VideoCodec codec_;
+  std::unique_ptr<DefaultVideoBitrateAllocator> allocator_;
+};
+
+TEST_F(DefaultVideoBitrateAllocatorTest, ZeroIsOff) {
+  BitrateAllocation allocation = allocator_->GetAllocation(0, kMaxFramerate);
+  EXPECT_EQ(0u, allocation.get_sum_bps());
+}
+
+TEST_F(DefaultVideoBitrateAllocatorTest, CapsToMin) {
+  BitrateAllocation allocation = allocator_->GetAllocation(1, kMaxFramerate);
+  EXPECT_EQ(kMinBitrateBps, allocation.get_sum_bps());
+
+  allocation = allocator_->GetAllocation(kMinBitrateBps - 1, kMaxFramerate);
+  EXPECT_EQ(kMinBitrateBps, allocation.get_sum_bps());
+
+  allocation = allocator_->GetAllocation(kMinBitrateBps, kMaxFramerate);
+  EXPECT_EQ(kMinBitrateBps, allocation.get_sum_bps());
+}
+
+TEST_F(DefaultVideoBitrateAllocatorTest, CapsToMax) {
+  BitrateAllocation allocation =
+      allocator_->GetAllocation(kMaxBitrateBps, kMaxFramerate);
+  EXPECT_EQ(kMaxBitrateBps, allocation.get_sum_bps());
+
+  allocation = allocator_->GetAllocation(kMaxBitrateBps + 1, kMaxFramerate);
+  EXPECT_EQ(kMaxBitrateBps, allocation.get_sum_bps());
+
+  allocation = allocator_->GetAllocation(std::numeric_limits<uint32_t>::max(),
+                                         kMaxFramerate);
+  EXPECT_EQ(kMaxBitrateBps, allocation.get_sum_bps());
+}
+
+TEST_F(DefaultVideoBitrateAllocatorTest, GoodInBetween) {
+  BitrateAllocation allocation =
+      allocator_->GetAllocation(kMinBitrateBps + 1, kMaxFramerate);
+  EXPECT_EQ(kMinBitrateBps + 1, allocation.get_sum_bps());
+
+  allocation = allocator_->GetAllocation(kMaxBitrateBps - 1, kMaxFramerate);
+  EXPECT_EQ(kMaxBitrateBps - 1, allocation.get_sum_bps());
+}
+}  // namespace webrtc