blob: ae027a9d8a757eec4c100d7dadfc4db8da32acaa [file] [log] [blame]
/*
* Copyright (c) 2011 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/codecs/vp8/default_temporal_layers.h"
#include <cstdint>
#include <memory>
#include "api/video/video_bitrate_allocation.h"
#include "api/video_codecs/video_codec.h"
#include "api/video_codecs/vp8_frame_config.h"
#include "modules/video_coding/codecs/vp8/libvpx_vp8_encoder.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "modules/video_coding/utility/simulcast_rate_allocator.h"
#include "test/field_trial.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "vpx/vp8cx.h"
// TODO(bugs.webrtc.org/10582): Test the behavior of UpdateConfiguration().
namespace webrtc {
namespace test {
namespace {
using ::testing::Each;
enum {
kTemporalUpdateLast = VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF,
kTemporalUpdateGoldenWithoutDependency =
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_UPD_LAST,
kTemporalUpdateGolden =
VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST,
kTemporalUpdateAltrefWithoutDependency =
VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_UPD_GF |
VP8_EFLAG_NO_UPD_LAST,
kTemporalUpdateAltref = VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_LAST,
kTemporalUpdateNone = VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_ENTROPY,
kTemporalUpdateNoneNoRefAltRef =
VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_ENTROPY,
kTemporalUpdateNoneNoRefGolden =
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF |
VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_ENTROPY,
kTemporalUpdateNoneNoRefGoldenAltRef =
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_REF_ARF |
VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_ENTROPY,
kTemporalUpdateGoldenWithoutDependencyRefAltRef =
VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST,
kTemporalUpdateGoldenRefAltRef = VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST,
kTemporalUpdateLastRefAltRef =
VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_REF_GF,
kTemporalUpdateLastAndGoldenRefAltRef =
VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_REF_GF,
};
using BufferFlags = Vp8FrameConfig::BufferFlags;
using Vp8BufferReference = Vp8FrameConfig::Vp8BufferReference;
constexpr uint8_t kNone = static_cast<uint8_t>(Vp8BufferReference::kNone);
constexpr uint8_t kLast = static_cast<uint8_t>(Vp8BufferReference::kLast);
constexpr uint8_t kGolden = static_cast<uint8_t>(Vp8BufferReference::kGolden);
constexpr uint8_t kAltref = static_cast<uint8_t>(Vp8BufferReference::kAltref);
constexpr uint8_t kAll = kLast | kGolden | kAltref;
constexpr int ToVp8CodecFlags(uint8_t referenced_buffers,
uint8_t updated_buffers,
bool update_entropy) {
return (((referenced_buffers & kLast) == 0) ? VP8_EFLAG_NO_REF_LAST : 0) |
(((referenced_buffers & kGolden) == 0) ? VP8_EFLAG_NO_REF_GF : 0) |
(((referenced_buffers & kAltref) == 0) ? VP8_EFLAG_NO_REF_ARF : 0) |
(((updated_buffers & kLast) == 0) ? VP8_EFLAG_NO_UPD_LAST : 0) |
(((updated_buffers & kGolden) == 0) ? VP8_EFLAG_NO_UPD_GF : 0) |
(((updated_buffers & kAltref) == 0) ? VP8_EFLAG_NO_UPD_ARF : 0) |
(update_entropy ? 0 : VP8_EFLAG_NO_UPD_ENTROPY);
}
constexpr int kKeyFrameFlags = ToVp8CodecFlags(kNone, kAll, true);
std::vector<uint32_t> GetTemporalLayerRates(int target_bitrate_kbps,
int framerate_fps,
int num_temporal_layers) {
VideoCodec codec;
codec.codecType = VideoCodecType::kVideoCodecVP8;
codec.numberOfSimulcastStreams = 1;
codec.maxBitrate = target_bitrate_kbps;
codec.maxFramerate = framerate_fps;
codec.simulcastStream[0].targetBitrate = target_bitrate_kbps;
codec.simulcastStream[0].maxBitrate = target_bitrate_kbps;
codec.simulcastStream[0].numberOfTemporalLayers = num_temporal_layers;
codec.simulcastStream[0].active = true;
SimulcastRateAllocator allocator(codec);
return allocator
.Allocate(
VideoBitrateAllocationParameters(target_bitrate_kbps, framerate_fps))
.GetTemporalLayerAllocation(0);
}
constexpr int kDefaultBitrateBps = 500;
constexpr int kDefaultFramerate = 30;
constexpr int kDefaultBytesPerFrame =
(kDefaultBitrateBps / 8) / kDefaultFramerate;
constexpr int kDefaultQp = 2;
} // namespace
class TemporalLayersTest : public ::testing::Test {
public:
~TemporalLayersTest() override = default;
CodecSpecificInfo* IgnoredCodecSpecificInfo() {
codec_specific_info_ = std::make_unique<CodecSpecificInfo>();
return codec_specific_info_.get();
}
private:
std::unique_ptr<CodecSpecificInfo> codec_specific_info_;
};
TEST_F(TemporalLayersTest, 2Layers) {
constexpr int kNumLayers = 2;
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
constexpr size_t kPatternSize = 4;
constexpr size_t kRepetitions = 4;
const int expected_flags[kPatternSize] = {
ToVp8CodecFlags(kLast, kLast, true),
ToVp8CodecFlags(kLast, kGolden, true),
ToVp8CodecFlags(kLast, kLast, true),
ToVp8CodecFlags(kLast | kGolden, kNone, false),
};
const int expected_temporal_idx[kPatternSize] = {0, 1, 0, 1};
const bool expected_layer_sync[kPatternSize] = {false, true, false, false};
uint32_t timestamp = 0;
for (size_t i = 0; i < kPatternSize * kRepetitions; ++i) {
const size_t ind = i % kPatternSize;
const bool is_keyframe = (i == 0);
CodecSpecificInfo info;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
EXPECT_EQ(is_keyframe ? kKeyFrameFlags : expected_flags[ind],
LibvpxVp8Encoder::EncodeFlags(tl_config))
<< i;
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, is_keyframe,
kDefaultQp, &info);
EXPECT_TRUE(checker.CheckTemporalConfig(is_keyframe, tl_config));
EXPECT_EQ(expected_temporal_idx[ind], info.codecSpecific.VP8.temporalIdx);
EXPECT_EQ(expected_temporal_idx[ind], tl_config.packetizer_temporal_idx);
EXPECT_EQ(expected_temporal_idx[ind], tl_config.encoder_layer_id);
EXPECT_EQ(is_keyframe || expected_layer_sync[ind],
info.codecSpecific.VP8.layerSync);
EXPECT_EQ(expected_layer_sync[ind], tl_config.layer_sync);
timestamp += 3000;
}
}
TEST_F(TemporalLayersTest, 3Layers) {
constexpr int kNumLayers = 3;
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
int expected_flags[16] = {
kTemporalUpdateLast,
kTemporalUpdateNoneNoRefGoldenAltRef,
kTemporalUpdateGoldenWithoutDependency,
kTemporalUpdateNoneNoRefAltRef,
kTemporalUpdateLast,
kTemporalUpdateNoneNoRefAltRef,
kTemporalUpdateGolden,
kTemporalUpdateNoneNoRefAltRef,
kTemporalUpdateLast,
kTemporalUpdateNoneNoRefGoldenAltRef,
kTemporalUpdateGoldenWithoutDependency,
kTemporalUpdateNoneNoRefAltRef,
kTemporalUpdateLast,
kTemporalUpdateNoneNoRefAltRef,
kTemporalUpdateGolden,
kTemporalUpdateNoneNoRefAltRef,
};
int expected_temporal_idx[16] = {0, 2, 1, 2, 0, 2, 1, 2,
0, 2, 1, 2, 0, 2, 1, 2};
bool expected_layer_sync[16] = {false, true, true, false, false, false,
false, false, false, true, true, false,
false, false, false, false};
unsigned int timestamp = 0;
for (int i = 0; i < 16; ++i) {
const bool is_keyframe = (i == 0);
CodecSpecificInfo info;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
EXPECT_EQ(is_keyframe ? kKeyFrameFlags : expected_flags[i],
LibvpxVp8Encoder::EncodeFlags(tl_config))
<< i;
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, is_keyframe,
kDefaultQp, &info);
EXPECT_TRUE(checker.CheckTemporalConfig(is_keyframe, tl_config));
EXPECT_EQ(expected_temporal_idx[i], info.codecSpecific.VP8.temporalIdx);
EXPECT_EQ(expected_temporal_idx[i], tl_config.packetizer_temporal_idx);
EXPECT_EQ(expected_temporal_idx[i], tl_config.encoder_layer_id);
EXPECT_EQ(is_keyframe || expected_layer_sync[i],
info.codecSpecific.VP8.layerSync);
EXPECT_EQ(expected_layer_sync[i], tl_config.layer_sync);
timestamp += 3000;
}
}
TEST_F(TemporalLayersTest, Alternative3Layers) {
constexpr int kNumLayers = 3;
ScopedFieldTrials field_trial("WebRTC-UseShortVP8TL3Pattern/Enabled/");
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
int expected_flags[8] = {kTemporalUpdateLast,
kTemporalUpdateAltrefWithoutDependency,
kTemporalUpdateGoldenWithoutDependency,
kTemporalUpdateNone,
kTemporalUpdateLast,
kTemporalUpdateAltrefWithoutDependency,
kTemporalUpdateGoldenWithoutDependency,
kTemporalUpdateNone};
int expected_temporal_idx[8] = {0, 2, 1, 2, 0, 2, 1, 2};
bool expected_layer_sync[8] = {false, true, true, false,
false, true, true, false};
unsigned int timestamp = 0;
for (int i = 0; i < 8; ++i) {
const bool is_keyframe = (i == 0);
CodecSpecificInfo info;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
EXPECT_EQ(is_keyframe ? kKeyFrameFlags : expected_flags[i],
LibvpxVp8Encoder::EncodeFlags(tl_config))
<< i;
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, is_keyframe,
kDefaultQp, &info);
EXPECT_TRUE(checker.CheckTemporalConfig(is_keyframe, tl_config));
EXPECT_EQ(expected_temporal_idx[i], info.codecSpecific.VP8.temporalIdx);
EXPECT_EQ(expected_temporal_idx[i], tl_config.packetizer_temporal_idx);
EXPECT_EQ(expected_temporal_idx[i], tl_config.encoder_layer_id);
EXPECT_EQ(is_keyframe || expected_layer_sync[i],
info.codecSpecific.VP8.layerSync);
EXPECT_EQ(expected_layer_sync[i], tl_config.layer_sync);
timestamp += 3000;
}
}
TEST_F(TemporalLayersTest, SearchOrder) {
constexpr int kNumLayers = 3;
ScopedFieldTrials field_trial("WebRTC-UseShortVP8TL3Pattern/Enabled/");
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
// Use a repeating pattern of tl 0, 2, 1, 2.
// Tl 0, 1, 2 update last, golden, altref respectively.
// Start with a key-frame. tl_config flags can be ignored.
uint32_t timestamp = 0;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, true, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame. First one only references TL0. Updates altref.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_EQ(tl_config.first_reference, Vp8BufferReference::kLast);
EXPECT_EQ(tl_config.second_reference, Vp8BufferReference::kNone);
// TL1 frame. Can only reference TL0. Updated golden.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_EQ(tl_config.first_reference, Vp8BufferReference::kLast);
EXPECT_EQ(tl_config.second_reference, Vp8BufferReference::kNone);
// TL2 frame. Can reference all three buffers. Golden was the last to be
// updated, the next to last was altref.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_EQ(tl_config.first_reference, Vp8BufferReference::kGolden);
EXPECT_EQ(tl_config.second_reference, Vp8BufferReference::kAltref);
}
TEST_F(TemporalLayersTest, SearchOrderWithDrop) {
constexpr int kNumLayers = 3;
ScopedFieldTrials field_trial("WebRTC-UseShortVP8TL3Pattern/Enabled/");
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
// Use a repeating pattern of tl 0, 2, 1, 2.
// Tl 0, 1, 2 update last, golden, altref respectively.
// Start with a key-frame. tl_config flags can be ignored.
uint32_t timestamp = 0;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, true, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame. First one only references TL0. Updates altref.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_EQ(tl_config.first_reference, Vp8BufferReference::kLast);
EXPECT_EQ(tl_config.second_reference, Vp8BufferReference::kNone);
// Dropped TL1 frame. Can only reference TL0. Should have updated golden.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, 0, false, 0, nullptr);
// TL2 frame. Can normally reference all three buffers, but golden has not
// been populated this cycle. Altref was last to be updated, before that last.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_EQ(tl_config.first_reference, Vp8BufferReference::kAltref);
EXPECT_EQ(tl_config.second_reference, Vp8BufferReference::kLast);
}
TEST_F(TemporalLayersTest, DoesNotReferenceDroppedFrames) {
constexpr int kNumLayers = 3;
// Use a repeating pattern of tl 0, 2, 1, 2.
// Tl 0, 1, 2 update last, golden, altref respectively.
ScopedFieldTrials field_trial("WebRTC-UseShortVP8TL3Pattern/Enabled/");
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
// Start with a keyframe.
uint32_t timestamp = 0;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, true, kDefaultQp,
IgnoredCodecSpecificInfo());
// Dropped TL2 frame.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, 0, false, 0, nullptr);
// Dropped TL1 frame.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, 0, false, 0, nullptr);
// TL2 frame. Can reference all three buffers, valid since golden and altref
// both contain the last keyframe.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_TRUE(tl_config.last_buffer_flags & BufferFlags::kReference);
EXPECT_TRUE(tl_config.golden_buffer_flags & BufferFlags::kReference);
EXPECT_TRUE(tl_config.arf_buffer_flags & BufferFlags::kReference);
// Restart of cycle!
// TL0 base layer frame, updating and referencing last.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame, updating altref.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL1 frame, updating golden.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame. Can still reference all buffer since they have been update this
// cycle.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_TRUE(tl_config.last_buffer_flags & BufferFlags::kReference);
EXPECT_TRUE(tl_config.golden_buffer_flags & BufferFlags::kReference);
EXPECT_TRUE(tl_config.arf_buffer_flags & BufferFlags::kReference);
// Restart of cycle!
// TL0 base layer frame, updating and referencing last.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// Dropped TL2 frame.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, 0, false, 0, nullptr);
// Dropped TL1 frame.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, 0, false, 0, nullptr);
// TL2 frame. This time golden and altref contain data from the previous cycle
// and cannot be referenced.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_TRUE(tl_config.last_buffer_flags & BufferFlags::kReference);
EXPECT_FALSE(tl_config.golden_buffer_flags & BufferFlags::kReference);
EXPECT_FALSE(tl_config.arf_buffer_flags & BufferFlags::kReference);
}
TEST_F(TemporalLayersTest, DoesNotReferenceUnlessGuaranteedToExist) {
constexpr int kNumLayers = 3;
// Use a repeating pattern of tl 0, 2, 1, 2.
// Tl 0, 1 updates last, golden respectively. Altref is always last keyframe.
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
// Start with a keyframe.
uint32_t timestamp = 0;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, true, kDefaultQp,
IgnoredCodecSpecificInfo());
// Do a full cycle of the pattern.
for (int i = 0; i < 7; ++i) {
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
}
// TL0 base layer frame, starting the cycle over.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// Encoder has a hiccup and builds a queue, so frame encoding is delayed.
// TL1 frame, updating golden.
tl_config = tl.NextFrameConfig(0, ++timestamp);
// TL2 frame, that should be referencing golden, but we can't be certain it's
// not going to be dropped, so that is not allowed.
tl_config = tl.NextFrameConfig(0, timestamp + 1);
EXPECT_TRUE(tl_config.last_buffer_flags & BufferFlags::kReference);
EXPECT_FALSE(tl_config.golden_buffer_flags & BufferFlags::kReference);
EXPECT_FALSE(tl_config.arf_buffer_flags & BufferFlags::kReference);
// TL0 base layer frame.
tl_config = tl.NextFrameConfig(0, timestamp + 2);
// The previous four enqueued frames finally get encoded, and the updated
// buffers are now OK to reference.
// Enqueued TL1 frame ready.
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// Enqueued TL2 frame.
tl.OnEncodeDone(0, ++timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// Enqueued TL0 frame.
tl.OnEncodeDone(0, ++timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame, all buffers are now in a known good state, OK to reference.
tl_config = tl.NextFrameConfig(0, ++timestamp + 1);
EXPECT_TRUE(tl_config.last_buffer_flags & BufferFlags::kReference);
EXPECT_TRUE(tl_config.golden_buffer_flags & BufferFlags::kReference);
EXPECT_FALSE(tl_config.arf_buffer_flags & BufferFlags::kReference);
}
TEST_F(TemporalLayersTest, DoesNotReferenceUnlessGuaranteedToExistLongDelay) {
constexpr int kNumLayers = 3;
// Use a repeating pattern of tl 0, 2, 1, 2.
// Tl 0, 1 updates last, golden, altref respectively.
ScopedFieldTrials field_trial("WebRTC-UseShortVP8TL3Pattern/Enabled/");
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
// Start with a keyframe.
uint32_t timestamp = 0;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, true, kDefaultQp,
IgnoredCodecSpecificInfo());
// Do a full cycle of the pattern.
for (int i = 0; i < 3; ++i) {
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
}
// TL0 base layer frame, starting the cycle over.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame.
tl_config = tl.NextFrameConfig(0, ++timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// Encoder has a hiccup and builds a queue, so frame encoding is delayed.
// Encoded, but delayed frames in TL 1, 2.
tl_config = tl.NextFrameConfig(0, timestamp + 1);
tl_config = tl.NextFrameConfig(0, timestamp + 2);
// Restart of the pattern!
// Encoded, but delayed frames in TL 2, 1.
tl_config = tl.NextFrameConfig(0, timestamp + 3);
tl_config = tl.NextFrameConfig(0, timestamp + 4);
// TL1 frame from last cycle is ready.
tl.OnEncodeDone(0, timestamp + 1, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame from last cycle is ready.
tl.OnEncodeDone(0, timestamp + 2, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
// TL2 frame, that should be referencing all buffers, but altref and golden
// haven not been updated this cycle. (Don't be fooled by the late frames from
// the last cycle!)
tl_config = tl.NextFrameConfig(0, timestamp + 5);
EXPECT_TRUE(tl_config.last_buffer_flags & BufferFlags::kReference);
EXPECT_FALSE(tl_config.golden_buffer_flags & BufferFlags::kReference);
EXPECT_FALSE(tl_config.arf_buffer_flags & BufferFlags::kReference);
}
TEST_F(TemporalLayersTest, KeyFrame) {
constexpr int kNumLayers = 3;
DefaultTemporalLayers tl(kNumLayers);
DefaultTemporalLayersChecker checker(kNumLayers);
tl.OnRatesUpdated(0,
GetTemporalLayerRates(kDefaultBytesPerFrame,
kDefaultFramerate, kNumLayers),
kDefaultFramerate);
tl.UpdateConfiguration(0);
int expected_flags[8] = {
kTemporalUpdateLastRefAltRef,
kTemporalUpdateNoneNoRefGoldenAltRef,
kTemporalUpdateGoldenWithoutDependency,
kTemporalUpdateNoneNoRefAltRef,
kTemporalUpdateLast,
kTemporalUpdateNoneNoRefAltRef,
kTemporalUpdateGolden,
kTemporalUpdateNone,
};
int expected_temporal_idx[8] = {0, 2, 1, 2, 0, 2, 1, 2};
bool expected_layer_sync[8] = {true, true, true, false,
false, false, false, false};
uint32_t timestamp = 0;
for (int i = 0; i < 7; ++i) {
// Temporal pattern starts from 0 after key frame. Let the first `i` - 1
// frames be delta frames, and the `i`th one key frame.
for (int j = 1; j <= i; ++j) {
// Since last frame was always a keyframe and thus index 0 in the pattern,
// this loop starts at index 1.
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
EXPECT_EQ(expected_flags[j], LibvpxVp8Encoder::EncodeFlags(tl_config))
<< j;
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, false, kDefaultQp,
IgnoredCodecSpecificInfo());
EXPECT_TRUE(checker.CheckTemporalConfig(false, tl_config));
EXPECT_EQ(expected_temporal_idx[j], tl_config.packetizer_temporal_idx);
EXPECT_EQ(expected_temporal_idx[j], tl_config.encoder_layer_id);
EXPECT_EQ(expected_layer_sync[j], tl_config.layer_sync);
timestamp += 3000;
}
CodecSpecificInfo info;
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp);
tl.OnEncodeDone(0, timestamp, kDefaultBytesPerFrame, true, kDefaultQp,
&info);
EXPECT_TRUE(info.codecSpecific.VP8.layerSync)
<< "Key frame should be marked layer sync.";
EXPECT_EQ(0, info.codecSpecific.VP8.temporalIdx)
<< "Key frame should always be packetized as layer 0";
EXPECT_EQ(0, info.generic_frame_info->temporal_id)
<< "Key frame should always be packetized as layer 0";
EXPECT_THAT(info.generic_frame_info->decode_target_indications,
Each(DecodeTargetIndication::kSwitch))
<< "Key frame is universal switch";
EXPECT_TRUE(checker.CheckTemporalConfig(true, tl_config));
}
}
TEST_F(TemporalLayersTest, SetsTlCountOnFirstConfigUpdate) {
// Create an instance and fetch config update without setting any rate.
constexpr int kNumLayers = 2;
DefaultTemporalLayers tl(kNumLayers);
Vp8EncoderConfig config = tl.UpdateConfiguration(0);
// Config should indicate correct number of temporal layers, but zero bitrate.
ASSERT_TRUE(config.temporal_layer_config.has_value());
EXPECT_EQ(config.temporal_layer_config->ts_number_layers,
uint32_t{kNumLayers});
std::array<uint32_t, Vp8EncoderConfig::TemporalLayerConfig::kMaxLayers>
kZeroRate = {};
EXPECT_EQ(config.temporal_layer_config->ts_target_bitrate, kZeroRate);
// On second call, no new update.
config = tl.UpdateConfiguration(0);
EXPECT_FALSE(config.temporal_layer_config.has_value());
}
class TemporalLayersReferenceTest : public TemporalLayersTest,
public ::testing::WithParamInterface<int> {
public:
TemporalLayersReferenceTest()
: timestamp_(1),
last_sync_timestamp_(timestamp_),
tl0_reference_(nullptr) {}
virtual ~TemporalLayersReferenceTest() {}
protected:
static const int kMaxPatternLength = 32;
struct BufferState {
BufferState() : BufferState(-1, 0, false) {}
BufferState(int temporal_idx, uint32_t timestamp, bool sync)
: temporal_idx(temporal_idx), timestamp(timestamp), sync(sync) {}
int temporal_idx;
uint32_t timestamp;
bool sync;
};
bool UpdateSyncRefState(const BufferFlags& flags, BufferState* buffer_state) {
if (flags & BufferFlags::kReference) {
if (buffer_state->temporal_idx == -1)
return true; // References key-frame.
if (buffer_state->temporal_idx == 0) {
// No more than one reference to TL0 frame.
EXPECT_EQ(nullptr, tl0_reference_);
tl0_reference_ = buffer_state;
return true;
}
return false; // References higher layer.
}
return true; // No reference, does not affect sync frame status.
}
void ValidateReference(const BufferFlags& flags,
const BufferState& buffer_state,
int temporal_layer) {
if (flags & BufferFlags::kReference) {
if (temporal_layer > 0 && buffer_state.timestamp > 0) {
// Check that high layer reference does not go past last sync frame.
EXPECT_GE(buffer_state.timestamp, last_sync_timestamp_);
}
// No reference to buffer in higher layer.
EXPECT_LE(buffer_state.temporal_idx, temporal_layer);
}
}
uint32_t timestamp_ = 1;
uint32_t last_sync_timestamp_ = timestamp_;
BufferState* tl0_reference_;
BufferState last_state;
BufferState golden_state;
BufferState altref_state;
};
INSTANTIATE_TEST_SUITE_P(DefaultTemporalLayersTest,
TemporalLayersReferenceTest,
::testing::Range(1, kMaxTemporalStreams + 1));
TEST_P(TemporalLayersReferenceTest, ValidFrameConfigs) {
const int num_layers = GetParam();
DefaultTemporalLayers tl(num_layers);
tl.OnRatesUpdated(
0, GetTemporalLayerRates(kDefaultBytesPerFrame, kDefaultFramerate, 1),
kDefaultFramerate);
tl.UpdateConfiguration(0);
// Run through the pattern and store the frame dependencies, plus keep track
// of the buffer state; which buffers references which temporal layers (if
// (any). If a given buffer is never updated, it is legal to reference it
// even for sync frames. In order to be general, don't assume TL0 always
// updates `last`.
std::vector<Vp8FrameConfig> tl_configs(kMaxPatternLength);
for (int i = 0; i < kMaxPatternLength; ++i) {
Vp8FrameConfig tl_config = tl.NextFrameConfig(0, timestamp_);
tl.OnEncodeDone(0, timestamp_, kDefaultBytesPerFrame, i == 0, kDefaultQp,
IgnoredCodecSpecificInfo());
++timestamp_;
EXPECT_FALSE(tl_config.drop_frame);
tl_configs.push_back(tl_config);
int temporal_idx = tl_config.encoder_layer_id;
// For the default layers, always keep encoder and rtp layers in sync.
EXPECT_EQ(tl_config.packetizer_temporal_idx, temporal_idx);
// Determine if this frame is in a higher layer but references only TL0
// or untouched buffers, if so verify it is marked as a layer sync.
bool is_sync_frame = true;
tl0_reference_ = nullptr;
if (temporal_idx <= 0) {
is_sync_frame = false; // TL0 by definition not a sync frame.
} else if (!UpdateSyncRefState(tl_config.last_buffer_flags, &last_state)) {
is_sync_frame = false;
} else if (!UpdateSyncRefState(tl_config.golden_buffer_flags,
&golden_state)) {
is_sync_frame = false;
} else if (!UpdateSyncRefState(tl_config.arf_buffer_flags, &altref_state)) {
is_sync_frame = false;
}
if (is_sync_frame) {
// Cache timestamp for last found sync frame, so that we can verify no
// references back past this frame.
ASSERT_TRUE(tl0_reference_);
last_sync_timestamp_ = tl0_reference_->timestamp;
}
EXPECT_EQ(tl_config.layer_sync, is_sync_frame);
// Validate no reference from lower to high temporal layer, or backwards
// past last reference frame.
ValidateReference(tl_config.last_buffer_flags, last_state, temporal_idx);
ValidateReference(tl_config.golden_buffer_flags, golden_state,
temporal_idx);
ValidateReference(tl_config.arf_buffer_flags, altref_state, temporal_idx);
// Update the current layer state.
BufferState state = {temporal_idx, timestamp_, is_sync_frame};
if (tl_config.last_buffer_flags & BufferFlags::kUpdate)
last_state = state;
if (tl_config.golden_buffer_flags & BufferFlags::kUpdate)
golden_state = state;
if (tl_config.arf_buffer_flags & BufferFlags::kUpdate)
altref_state = state;
}
}
} // namespace test
} // namespace webrtc