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/*
* 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/rtp_rtcp/source/rtp_dependency_descriptor_extension.h"
#include "api/array_view.h"
#include "api/transport/rtp/dependency_descriptor.h"
#include "common_video/generic_frame_descriptor/generic_frame_info.h"
#include "test/gmock.h"
namespace webrtc {
namespace {
using ::testing::Each;
TEST(RtpDependencyDescriptorExtensionTest, Writer3BytesForPerfectTemplate) {
uint8_t buffer[3];
FrameDependencyStructure structure;
structure.num_decode_targets = 2;
structure.num_chains = 2;
structure.templates = {
FrameDependencyTemplate().Dtis("SR").FrameDiffs({1}).ChainDiffs({2, 2})};
DependencyDescriptor descriptor;
descriptor.frame_dependencies = structure.templates[0];
EXPECT_EQ(RtpDependencyDescriptorExtension::ValueSize(structure, descriptor),
3u);
EXPECT_TRUE(
RtpDependencyDescriptorExtension::Write(buffer, structure, descriptor));
}
TEST(RtpDependencyDescriptorExtensionTest, WriteZeroInUnusedBits) {
uint8_t buffer[32];
std::memset(buffer, 0xff, sizeof(buffer));
FrameDependencyStructure structure;
structure.num_decode_targets = 2;
structure.num_chains = 2;
structure.templates = {
FrameDependencyTemplate().Dtis("SR").FrameDiffs({1}).ChainDiffs({1, 1})};
DependencyDescriptor descriptor;
descriptor.frame_dependencies = structure.templates[0];
descriptor.frame_dependencies.frame_diffs = {2};
// To test unused bytes are zeroed, need a buffer large enough.
size_t value_size =
RtpDependencyDescriptorExtension::ValueSize(structure, descriptor);
ASSERT_LT(value_size, sizeof(buffer));
ASSERT_TRUE(
RtpDependencyDescriptorExtension::Write(buffer, structure, descriptor));
const uint8_t* unused_bytes = buffer + value_size;
size_t num_unused_bytes = buffer + sizeof(buffer) - unused_bytes;
// Check remaining bytes are zeroed.
EXPECT_THAT(rtc::MakeArrayView(unused_bytes, num_unused_bytes), Each(0));
}
// In practice chain diff for inactive chain will grow uboundly because no
// frames are produced for it, that shouldn't block writing the extension.
TEST(RtpDependencyDescriptorExtensionTest,
TemplateMatchingSkipsInactiveChains) {
uint8_t buffer[3];
FrameDependencyStructure structure;
structure.num_decode_targets = 2;
structure.num_chains = 2;
structure.templates = {
FrameDependencyTemplate().Dtis("SR").ChainDiffs({2, 2})};
DependencyDescriptor descriptor;
descriptor.frame_dependencies = structure.templates[0];
// Set only 1st chain as active.
std::bitset<32> active_chains = 0b01;
descriptor.frame_dependencies.chain_diffs[1] = 1000;
// Expect perfect template match since the only difference is for an inactive
// chain. Pefect template match consumes 3 bytes.
EXPECT_EQ(RtpDependencyDescriptorExtension::ValueSize(
structure, active_chains, descriptor),
3u);
EXPECT_TRUE(RtpDependencyDescriptorExtension::Write(
buffer, structure, active_chains, descriptor));
}
TEST(RtpDependencyDescriptorExtensionTest,
AcceptsInvalidChainDiffForInactiveChainWhenChainsAreCustom) {
uint8_t buffer[256];
FrameDependencyStructure structure;
structure.num_decode_targets = 2;
structure.num_chains = 2;
structure.templates = {
FrameDependencyTemplate().Dtis("SR").ChainDiffs({2, 2})};
DependencyDescriptor descriptor;
descriptor.frame_dependencies = structure.templates[0];
// Set only 1st chain as active.
std::bitset<32> active_chains = 0b01;
// Set chain_diff different to the template to make it custom.
descriptor.frame_dependencies.chain_diffs[0] = 1;
// Set chain diff for inactive chain beyound limit of 255 max chain diff.
descriptor.frame_dependencies.chain_diffs[1] = 1000;
// Because chains are custom, should use more than base 3 bytes.
EXPECT_GT(RtpDependencyDescriptorExtension::ValueSize(
structure, active_chains, descriptor),
3u);
EXPECT_TRUE(RtpDependencyDescriptorExtension::Write(
buffer, structure, active_chains, descriptor));
}
TEST(RtpDependencyDescriptorExtensionTest, FailsToWriteInvalidDescriptor) {
uint8_t buffer[256];
FrameDependencyStructure structure;
structure.num_decode_targets = 2;
structure.num_chains = 2;
structure.templates = {
FrameDependencyTemplate().T(0).Dtis("SR").ChainDiffs({2, 2})};
DependencyDescriptor descriptor;
descriptor.frame_dependencies = structure.templates[0];
descriptor.frame_dependencies.temporal_id = 1;
EXPECT_EQ(
RtpDependencyDescriptorExtension::ValueSize(structure, 0b11, descriptor),
0u);
EXPECT_FALSE(RtpDependencyDescriptorExtension::Write(buffer, structure, 0b11,
descriptor));
}
} // namespace
} // namespace webrtc
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