diff options
Diffstat (limited to 'webrtc/modules/video_coding/codecs/vp9/screenshare_layers_unittest.cc')
-rw-r--r-- | webrtc/modules/video_coding/codecs/vp9/screenshare_layers_unittest.cc | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/webrtc/modules/video_coding/codecs/vp9/screenshare_layers_unittest.cc b/webrtc/modules/video_coding/codecs/vp9/screenshare_layers_unittest.cc new file mode 100644 index 0000000000..5eb7b237ac --- /dev/null +++ b/webrtc/modules/video_coding/codecs/vp9/screenshare_layers_unittest.cc @@ -0,0 +1,323 @@ +/* + * Copyright (c) 2015 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 "testing/gtest/include/gtest/gtest.h" +#include "vpx/vp8cx.h" +#include "webrtc/base/logging.h" +#include "webrtc/modules/video_coding/codecs/vp9/screenshare_layers.h" +#include "webrtc/modules/video_coding/codecs/vp9/vp9_impl.h" +#include "webrtc/system_wrappers/include/clock.h" + +namespace webrtc { + +typedef VP9EncoderImpl::SuperFrameRefSettings Settings; + +const uint32_t kTickFrequency = 90000; + +class ScreenshareLayerTestVP9 : public ::testing::Test { + protected: + ScreenshareLayerTestVP9() : clock_(0) {} + virtual ~ScreenshareLayerTestVP9() {} + + void InitScreenshareLayers(int layers) { + layers_.reset(new ScreenshareLayersVP9(layers)); + } + + void ConfigureBitrateForLayer(int kbps, uint8_t layer_id) { + layers_->ConfigureBitrate(kbps, layer_id); + } + + void AdvanceTime(int64_t milliseconds) { + clock_.AdvanceTimeMilliseconds(milliseconds); + } + + void AddKilobitsToLayer(int kilobits, uint8_t layer_id) { + layers_->LayerFrameEncoded(kilobits * 1000 / 8, layer_id); + } + + void EqualRefsForLayer(const Settings& actual, uint8_t layer_id) { + EXPECT_EQ(expected_.layer[layer_id].upd_buf, + actual.layer[layer_id].upd_buf); + EXPECT_EQ(expected_.layer[layer_id].ref_buf1, + actual.layer[layer_id].ref_buf1); + EXPECT_EQ(expected_.layer[layer_id].ref_buf2, + actual.layer[layer_id].ref_buf2); + EXPECT_EQ(expected_.layer[layer_id].ref_buf3, + actual.layer[layer_id].ref_buf3); + } + + void EqualRefs(const Settings& actual) { + for (unsigned int layer_id = 0; layer_id < kMaxVp9NumberOfSpatialLayers; + ++layer_id) { + EqualRefsForLayer(actual, layer_id); + } + } + + void EqualStartStopKeyframe(const Settings& actual) { + EXPECT_EQ(expected_.start_layer, actual.start_layer); + EXPECT_EQ(expected_.stop_layer, actual.stop_layer); + EXPECT_EQ(expected_.is_keyframe, actual.is_keyframe); + } + + // Check that the settings returned by GetSuperFrameSettings() is + // equal to the expected_ settings. + void EqualToExpected() { + uint32_t frame_timestamp_ = + clock_.TimeInMilliseconds() * (kTickFrequency / 1000); + Settings actual = + layers_->GetSuperFrameSettings(frame_timestamp_, expected_.is_keyframe); + EqualRefs(actual); + EqualStartStopKeyframe(actual); + } + + Settings expected_; + SimulatedClock clock_; + rtc::scoped_ptr<ScreenshareLayersVP9> layers_; +}; + +TEST_F(ScreenshareLayerTestVP9, NoRefsOnKeyFrame) { + const int kNumLayers = kMaxVp9NumberOfSpatialLayers; + InitScreenshareLayers(kNumLayers); + expected_.start_layer = 0; + expected_.stop_layer = kNumLayers - 1; + + for (int l = 0; l < kNumLayers; ++l) { + expected_.layer[l].upd_buf = l; + } + expected_.is_keyframe = true; + EqualToExpected(); + + for (int l = 0; l < kNumLayers; ++l) { + expected_.layer[l].ref_buf1 = l; + } + expected_.is_keyframe = false; + EqualToExpected(); +} + +// Test if it is possible to send at a high bitrate (over the threshold) +// after a longer period of low bitrate. This should not be possible. +TEST_F(ScreenshareLayerTestVP9, DontAccumelateAvailableBitsOverTime) { + InitScreenshareLayers(2); + ConfigureBitrateForLayer(100, 0); + + expected_.layer[0].upd_buf = 0; + expected_.layer[0].ref_buf1 = 0; + expected_.layer[1].upd_buf = 1; + expected_.layer[1].ref_buf1 = 1; + expected_.start_layer = 0; + expected_.stop_layer = 1; + + // Send 10 frames at a low bitrate (50 kbps) + for (int i = 0; i < 10; ++i) { + AdvanceTime(200); + EqualToExpected(); + AddKilobitsToLayer(10, 0); + } + + AdvanceTime(200); + EqualToExpected(); + AddKilobitsToLayer(301, 0); + + // Send 10 frames at a high bitrate (200 kbps) + expected_.start_layer = 1; + for (int i = 0; i < 10; ++i) { + AdvanceTime(200); + EqualToExpected(); + AddKilobitsToLayer(40, 1); + } +} + +// Test if used bits are accumelated over layers, as they should; +TEST_F(ScreenshareLayerTestVP9, AccumelateUsedBitsOverLayers) { + const int kNumLayers = kMaxVp9NumberOfSpatialLayers; + InitScreenshareLayers(kNumLayers); + for (int l = 0; l < kNumLayers - 1; ++l) + ConfigureBitrateForLayer(100, l); + for (int l = 0; l < kNumLayers; ++l) { + expected_.layer[l].upd_buf = l; + expected_.layer[l].ref_buf1 = l; + } + + expected_.start_layer = 0; + expected_.stop_layer = kNumLayers - 1; + EqualToExpected(); + + for (int layer = 0; layer < kNumLayers - 1; ++layer) { + expected_.start_layer = layer; + EqualToExpected(); + AddKilobitsToLayer(101, layer); + } +} + +// General testing of the bitrate controller. +TEST_F(ScreenshareLayerTestVP9, 2LayerBitrate) { + InitScreenshareLayers(2); + ConfigureBitrateForLayer(100, 0); + + expected_.layer[0].upd_buf = 0; + expected_.layer[1].upd_buf = 1; + expected_.layer[0].ref_buf1 = -1; + expected_.layer[1].ref_buf1 = -1; + expected_.start_layer = 0; + expected_.stop_layer = 1; + + expected_.is_keyframe = true; + EqualToExpected(); + AddKilobitsToLayer(100, 0); + + expected_.layer[0].ref_buf1 = 0; + expected_.layer[1].ref_buf1 = 1; + expected_.is_keyframe = false; + AdvanceTime(199); + EqualToExpected(); + AddKilobitsToLayer(100, 0); + + expected_.start_layer = 1; + for (int frame = 0; frame < 3; ++frame) { + AdvanceTime(200); + EqualToExpected(); + AddKilobitsToLayer(100, 1); + } + + // Just before enough bits become available for L0 @0.999 seconds. + AdvanceTime(199); + EqualToExpected(); + AddKilobitsToLayer(100, 1); + + // Just after enough bits become available for L0 @1.0001 seconds. + expected_.start_layer = 0; + AdvanceTime(2); + EqualToExpected(); + AddKilobitsToLayer(100, 0); + + // Keyframes always encode all layers, even if it is over budget. + expected_.layer[0].ref_buf1 = -1; + expected_.layer[1].ref_buf1 = -1; + expected_.is_keyframe = true; + AdvanceTime(499); + EqualToExpected(); + expected_.layer[0].ref_buf1 = 0; + expected_.layer[1].ref_buf1 = 1; + expected_.start_layer = 1; + expected_.is_keyframe = false; + EqualToExpected(); + AddKilobitsToLayer(100, 0); + + // 400 kb in L0 --> @3 second mark to fall below the threshold.. + // just before @2.999 seconds. + expected_.is_keyframe = false; + AdvanceTime(1499); + EqualToExpected(); + AddKilobitsToLayer(100, 1); + + // just after @3.001 seconds. + expected_.start_layer = 0; + AdvanceTime(2); + EqualToExpected(); + AddKilobitsToLayer(100, 0); +} + +// General testing of the bitrate controller. +TEST_F(ScreenshareLayerTestVP9, 3LayerBitrate) { + InitScreenshareLayers(3); + ConfigureBitrateForLayer(100, 0); + ConfigureBitrateForLayer(100, 1); + + for (int l = 0; l < 3; ++l) { + expected_.layer[l].upd_buf = l; + expected_.layer[l].ref_buf1 = l; + } + expected_.start_layer = 0; + expected_.stop_layer = 2; + + EqualToExpected(); + AddKilobitsToLayer(105, 0); + AddKilobitsToLayer(30, 1); + + AdvanceTime(199); + EqualToExpected(); + AddKilobitsToLayer(105, 0); + AddKilobitsToLayer(30, 1); + + expected_.start_layer = 1; + AdvanceTime(200); + EqualToExpected(); + AddKilobitsToLayer(130, 1); + + expected_.start_layer = 2; + AdvanceTime(200); + EqualToExpected(); + + // 400 kb in L1 --> @1.0 second mark to fall below threshold. + // 210 kb in L0 --> @1.1 second mark to fall below threshold. + // Just before L1 @0.999 seconds. + AdvanceTime(399); + EqualToExpected(); + + // Just after L1 @1.001 seconds. + expected_.start_layer = 1; + AdvanceTime(2); + EqualToExpected(); + + // Just before L0 @1.099 seconds. + AdvanceTime(99); + EqualToExpected(); + + // Just after L0 @1.101 seconds. + expected_.start_layer = 0; + AdvanceTime(2); + EqualToExpected(); + + // @1.1 seconds + AdvanceTime(99); + EqualToExpected(); + AddKilobitsToLayer(200, 1); + + expected_.is_keyframe = true; + for (int l = 0; l < 3; ++l) + expected_.layer[l].ref_buf1 = -1; + AdvanceTime(200); + EqualToExpected(); + + expected_.is_keyframe = false; + expected_.start_layer = 2; + for (int l = 0; l < 3; ++l) + expected_.layer[l].ref_buf1 = l; + AdvanceTime(200); + EqualToExpected(); +} + +// Test that the bitrate calculations are +// correct when the timestamp wrap. +TEST_F(ScreenshareLayerTestVP9, TimestampWrap) { + InitScreenshareLayers(2); + ConfigureBitrateForLayer(100, 0); + + expected_.layer[0].upd_buf = 0; + expected_.layer[0].ref_buf1 = 0; + expected_.layer[1].upd_buf = 1; + expected_.layer[1].ref_buf1 = 1; + expected_.start_layer = 0; + expected_.stop_layer = 1; + + // Advance time to just before the timestamp wraps. + AdvanceTime(std::numeric_limits<uint32_t>::max() / (kTickFrequency / 1000)); + EqualToExpected(); + AddKilobitsToLayer(200, 0); + + // Wrap + expected_.start_layer = 1; + AdvanceTime(1); + EqualToExpected(); +} + +} // namespace webrtc |