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/* Copyright (c) 2013 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 <map>
#include <memory>
#include <utility>
#include <vector>
#include "api/video_codecs/vp8_frame_config.h"
#include "api/video_codecs/vp8_temporal_layers.h"
#include "modules/video_coding/codecs/vp8/include/temporal_layers_checker.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "modules/video_coding/utility/frame_dropper.h"
#include "rtc_base/numerics/sequence_number_unwrapper.h"
#include "rtc_base/rate_statistics.h"
namespace webrtc {
struct CodecSpecificInfoVP8;
class Clock;
class ScreenshareLayers final : public Vp8FrameBufferController {
static const double kMaxTL0FpsReduction;
static const double kAcceptableTargetOvershoot;
static const int kMaxFrameIntervalMs;
explicit ScreenshareLayers(int num_temporal_layers);
~ScreenshareLayers() override;
void SetQpLimits(size_t stream_index, int min_qp, int max_qp) override;
size_t StreamCount() const override;
bool SupportsEncoderFrameDropping(size_t stream_index) const override;
// Returns the recommended VP8 encode flags needed. May refresh the decoder
// and/or update the reference buffers.
Vp8FrameConfig NextFrameConfig(size_t stream_index,
uint32_t rtp_timestamp) override;
// New target bitrate, per temporal layer.
void OnRatesUpdated(size_t stream_index,
const std::vector<uint32_t>& bitrates_bps,
int framerate_fps) override;
Vp8EncoderConfig UpdateConfiguration(size_t stream_index) override;
void OnEncodeDone(size_t stream_index,
uint32_t rtp_timestamp,
size_t size_bytes,
bool is_keyframe,
int qp,
CodecSpecificInfo* info) override;
void OnFrameDropped(size_t stream_index, uint32_t rtp_timestamp) override;
void OnPacketLossRateUpdate(float packet_loss_rate) override;
void OnRttUpdate(int64_t rtt_ms) override;
void OnLossNotification(
const VideoEncoder::LossNotification& loss_notification) override;
enum class TemporalLayerState : int { kDrop, kTl0, kTl1, kTl1Sync };
struct DependencyInfo {
DependencyInfo() = default;
DependencyInfo(absl::string_view indication_symbols,
Vp8FrameConfig frame_config)
: decode_target_indications(
frame_config(frame_config) {}
absl::InlinedVector<DecodeTargetIndication, 10> decode_target_indications;
Vp8FrameConfig frame_config;
bool TimeToSync(int64_t timestamp) const;
uint32_t GetCodecTargetBitrateKbps() const;
const int number_of_temporal_layers_;
// TODO(eladalon/sprang): These should be made into const-int set in the ctor.
absl::optional<int> min_qp_;
absl::optional<int> max_qp_;
int active_layer_;
int64_t last_timestamp_;
int64_t last_sync_timestamp_;
int64_t last_emitted_tl0_timestamp_;
int64_t last_frame_time_ms_;
RtpTimestampUnwrapper time_wrap_handler_;
uint32_t max_debt_bytes_;
std::map<uint32_t, DependencyInfo> pending_frame_configs_;
// Configured max framerate.
absl::optional<uint32_t> target_framerate_;
// Incoming framerate from capturer.
absl::optional<uint32_t> capture_framerate_;
// Tracks what framerate we actually encode, and drops frames on overshoot.
RateStatistics encode_framerate_;
bool bitrate_updated_;
static constexpr int kMaxNumTemporalLayers = 2;
struct TemporalLayer {
: state(State::kNormal),
target_rate_kbps_(0) {}
enum class State {
} state;
int enhanced_max_qp;
int last_qp;
uint32_t debt_bytes_;
uint32_t target_rate_kbps_;
void UpdateDebt(int64_t delta_ms);
} layers_[kMaxNumTemporalLayers];
void UpdateHistograms();
FrameDependencyStructure GetTemplateStructure(int num_layers) const;
// Data for histogram statistics.
struct Stats {
int64_t first_frame_time_ms_ = -1;
int64_t num_tl0_frames_ = 0;
int64_t num_tl1_frames_ = 0;
int64_t num_dropped_frames_ = 0;
int64_t num_overshoots_ = 0;
int64_t tl0_qp_sum_ = 0;
int64_t tl1_qp_sum_ = 0;
int64_t tl0_target_bitrate_sum_ = 0;
int64_t tl1_target_bitrate_sum_ = 0;
} stats_;
Vp8EncoderConfig encoder_config_;
// Optional utility used to verify reference validity.
std::unique_ptr<TemporalLayersChecker> checker_;
} // namespace webrtc