mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-14 14:20:45 +01:00
beabdcb498
This is in preparation for https://webrtc-review.googlesource.com/c/src/+/36340 With these changes we can avoid some strange #ifdefs in the code that uses temporal layers. Bug: webrtc:7925 Change-Id: I472210738ccc9f73812b8863951befeabec56f15 Reviewed-on: https://webrtc-review.googlesource.com/41280 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Anders Carlsson <andersc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21759}
128 lines
4.1 KiB
C++
128 lines
4.1 KiB
C++
/* 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(Vp8EncoderConfig* 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_;
|
|
int64_t last_frame_time_ms_;
|
|
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_
|