blob: 182891fa500831bb5fb87eca4c60f7d5675b0ef1 [file] [log] [blame]
/*
* 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/codecs/av1/scalability_structure_s2t1.h"
#include <utility>
#include <vector>
#include "absl/base/macros.h"
#include "api/transport/rtp/dependency_descriptor.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
namespace {
constexpr auto kNotPresent = DecodeTargetIndication::kNotPresent;
constexpr auto kSwitch = DecodeTargetIndication::kSwitch;
constexpr DecodeTargetIndication kDtis[2][2] = {
{kSwitch, kNotPresent}, // S0
{kNotPresent, kSwitch}, // S1
};
} // namespace
ScalabilityStructureS2T1::~ScalabilityStructureS2T1() = default;
ScalableVideoController::StreamLayersConfig
ScalabilityStructureS2T1::StreamConfig() const {
StreamLayersConfig result;
result.num_spatial_layers = 2;
result.num_temporal_layers = 1;
result.scaling_factor_num[0] = 1;
result.scaling_factor_den[0] = 2;
return result;
}
FrameDependencyStructure ScalabilityStructureS2T1::DependencyStructure() const {
FrameDependencyStructure structure;
structure.num_decode_targets = 2;
structure.num_chains = 2;
structure.decode_target_protected_by_chain = {0, 1};
structure.templates.resize(4);
structure.templates[0].S(0).Dtis("S-").ChainDiffs({2, 1}).FrameDiffs({2});
structure.templates[1].S(0).Dtis("S-").ChainDiffs({0, 0});
structure.templates[2].S(1).Dtis("-S").ChainDiffs({1, 2}).FrameDiffs({2});
structure.templates[3].S(1).Dtis("-S").ChainDiffs({1, 0});
return structure;
}
std::vector<ScalableVideoController::LayerFrameConfig>
ScalabilityStructureS2T1::NextFrameConfig(bool restart) {
std::vector<LayerFrameConfig> result(2);
// Buffer0 keeps latest S0T0 frame, Buffer1 keeps latest S1T0 frame.
if (restart || keyframe_) {
result[0].S(0).Keyframe().Update(0);
result[1].S(1).Keyframe().Update(1);
keyframe_ = false;
} else {
result[0].S(0).ReferenceAndUpdate(0);
result[1].S(1).ReferenceAndUpdate(1);
}
return result;
}
absl::optional<GenericFrameInfo> ScalabilityStructureS2T1::OnEncodeDone(
LayerFrameConfig config) {
absl::optional<GenericFrameInfo> frame_info;
if (config.SpatialId() < 0 ||
config.SpatialId() >= int{ABSL_ARRAYSIZE(kDtis)}) {
RTC_LOG(LS_ERROR) << "Unexpected spatial id " << config.SpatialId();
return frame_info;
}
frame_info.emplace();
frame_info->spatial_id = config.SpatialId();
frame_info->temporal_id = config.TemporalId();
frame_info->encoder_buffers = std::move(config.Buffers());
frame_info->decode_target_indications.assign(
std::begin(kDtis[config.SpatialId()]),
std::end(kDtis[config.SpatialId()]));
frame_info->part_of_chain = {config.SpatialId() == 0,
config.SpatialId() == 1};
return frame_info;
}
} // namespace webrtc