1 files changed, 121 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator_unittest.cc b/third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator_unittest.cc
new file mode 100644
index 0000000000..a09650401a
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/frame_dependencies_calculator_unittest.cc
@@ -0,0 +1,121 @@
+/*
+ *  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 "modules/video_coding/frame_dependencies_calculator.h"
+
+#include "common_video/generic_frame_descriptor/generic_frame_info.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+namespace {
+
+using ::testing::ElementsAre;
+using ::testing::IsEmpty;
+using ::testing::UnorderedElementsAre;
+
+constexpr CodecBufferUsage ReferenceAndUpdate(int id) {
+  return CodecBufferUsage(id, /*referenced=*/true, /*updated=*/true);
+}
+constexpr CodecBufferUsage Reference(int id) {
+  return CodecBufferUsage(id, /*referenced=*/true, /*updated=*/false);
+}
+constexpr CodecBufferUsage Update(int id) {
+  return CodecBufferUsage(id, /*referenced=*/false, /*updated=*/true);
+}
+
+TEST(FrameDependenciesCalculatorTest, SingleLayer) {
+  CodecBufferUsage pattern[] = {ReferenceAndUpdate(0)};
+  FrameDependenciesCalculator calculator;
+
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/1, pattern), IsEmpty());
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/3, pattern),
+              ElementsAre(1));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/6, pattern),
+              ElementsAre(3));
+}
+
+TEST(FrameDependenciesCalculatorTest, TwoTemporalLayers) {
+  // Shortened 4-frame pattern:
+  // T1:  2---4   6---8 ...
+  //      /   /   /   /
+  // T0: 1---3---5---7 ...
+  CodecBufferUsage pattern0[] = {ReferenceAndUpdate(0)};
+  CodecBufferUsage pattern1[] = {Reference(0), Update(1)};
+  CodecBufferUsage pattern2[] = {ReferenceAndUpdate(0)};
+  CodecBufferUsage pattern3[] = {Reference(0), Reference(1)};
+  FrameDependenciesCalculator calculator;
+
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/1, pattern0), IsEmpty());
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/2, pattern1),
+              ElementsAre(1));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/3, pattern2),
+              ElementsAre(1));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/4, pattern3),
+              UnorderedElementsAre(2, 3));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/5, pattern0),
+              ElementsAre(3));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/6, pattern1),
+              ElementsAre(5));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/7, pattern2),
+              ElementsAre(5));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/8, pattern3),
+              UnorderedElementsAre(6, 7));
+}
+
+TEST(FrameDependenciesCalculatorTest, ThreeTemporalLayers4FramePattern) {
+  // T2:   2---4   6---8 ...
+  //      /   /   /   /
+  // T1:  |  3    |  7   ...
+  //      /_/     /_/
+  // T0: 1-------5-----  ...
+  CodecBufferUsage pattern0[] = {ReferenceAndUpdate(0)};
+  CodecBufferUsage pattern1[] = {Reference(0), Update(2)};
+  CodecBufferUsage pattern2[] = {Reference(0), Update(1)};
+  CodecBufferUsage pattern3[] = {Reference(0), Reference(1), Reference(2)};
+  FrameDependenciesCalculator calculator;
+
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/1, pattern0), IsEmpty());
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/2, pattern1),
+              ElementsAre(1));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/3, pattern2),
+              ElementsAre(1));
+  // Note that frame#4 references buffer#0 that is updated by frame#1,
+  // yet there is no direct dependency from frame#4 to frame#1.
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/4, pattern3),
+              UnorderedElementsAre(2, 3));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/5, pattern0),
+              ElementsAre(1));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/6, pattern1),
+              ElementsAre(5));
+}
+
+TEST(FrameDependenciesCalculatorTest, SimulcastWith2Layers) {
+  // S1: 2---4---6-  ...
+  //
+  // S0: 1---3---5-  ...
+  CodecBufferUsage pattern0[] = {ReferenceAndUpdate(0)};
+  CodecBufferUsage pattern1[] = {ReferenceAndUpdate(1)};
+  FrameDependenciesCalculator calculator;
+
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/1, pattern0), IsEmpty());
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/2, pattern1), IsEmpty());
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/3, pattern0),
+              ElementsAre(1));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/4, pattern1),
+              ElementsAre(2));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/5, pattern0),
+              ElementsAre(3));
+  EXPECT_THAT(calculator.FromBuffersUsage(/*frame_id=*/6, pattern1),
+              ElementsAre(4));
+}
+
+}  // namespace
+}  // namespace webrtc