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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.
*/
#ifndef MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
#define MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
#include <vector>
#include "modules/video_coding/codecs/vp8/temporal_layers.h"
#include "modules/video_coding/utility/frame_dropper.h"
#include "rtc_base/rate_statistics.h"
#include "rtc_base/timeutils.h"
#include "typedefs.h" // NOLINT(build/include)
namespace webrtc {
struct CodecSpecificInfoVP8;
class Clock;
class ScreenshareLayers : public TemporalLayers {
public:
static const double kMaxTL0FpsReduction;
static const double kAcceptableTargetOvershoot;
static const int kMaxFrameIntervalMs;
ScreenshareLayers(int num_temporal_layers,
uint8_t initial_tl0_pic_idx,
Clock* clock);
virtual ~ScreenshareLayers();
// Returns the recommended VP8 encode flags needed. May refresh the decoder
// and/or update the reference buffers.
TemporalLayers::FrameConfig UpdateLayerConfig(uint32_t timestamp) override;
// Update state based on new bitrate target and incoming framerate.
// Returns the bitrate allocation for the active temporal layers.
std::vector<uint32_t> OnRatesUpdated(int bitrate_kbps,
int max_bitrate_kbps,
int framerate) override;
// Update the encoder configuration with target bitrates or other parameters.
// Returns true iff the configuration was actually modified.
bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) override;
void PopulateCodecSpecific(bool base_layer_sync,
const TemporalLayers::FrameConfig& tl_config,
CodecSpecificInfoVP8* vp8_info,
uint32_t timestamp) override;
void FrameEncoded(unsigned int size, int qp) override;
uint8_t Tl0PicIdx() const override;
private:
enum class TemporalLayerState : int { kDrop, kTl0, kTl1, kTl1Sync };
bool TimeToSync(int64_t timestamp) const;
uint32_t GetCodecTargetBitrateKbps() const;
Clock* const clock_;
int number_of_temporal_layers_;
bool last_base_layer_sync_;
uint8_t tl0_pic_idx_;
int active_layer_;
int64_t last_timestamp_;
int64_t last_sync_timestamp_;
int64_t last_emitted_tl0_timestamp_;
rtc::TimestampWrapAroundHandler time_wrap_handler_;
int min_qp_;
int max_qp_;
uint32_t max_debt_bytes_;
// Configured max framerate.
rtc::Optional<uint32_t> target_framerate_;
// Incoming framerate from capturer.
rtc::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 {
TemporalLayer()
: state(State::kNormal),
enhanced_max_qp(-1),
last_qp(-1),
debt_bytes_(0),
target_rate_kbps_(0) {}
enum class State {
kNormal,
kDropped,
kReencoded,
kQualityBoost,
} 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();
// 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_;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_CODECS_VP8_SCREENSHARE_LAYERS_H_
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