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Diffstat (limited to 'third_party/libwebrtc/video/video_stream_encoder.h')
| -rw-r--r-- | third_party/libwebrtc/video/video_stream_encoder.h | 494 |
1 files changed, 494 insertions, 0 deletions
diff --git a/third_party/libwebrtc/video/video_stream_encoder.h b/third_party/libwebrtc/video/video_stream_encoder.h new file mode 100644 index 0000000000..ccff3ffefd --- /dev/null +++ b/third_party/libwebrtc/video/video_stream_encoder.h @@ -0,0 +1,494 @@ +/* + * Copyright (c) 2012 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 VIDEO_VIDEO_STREAM_ENCODER_H_ +#define VIDEO_VIDEO_STREAM_ENCODER_H_ + +#include <atomic> +#include <map> +#include <memory> +#include <string> +#include <vector> + +#include "absl/container/inlined_vector.h" +#include "api/adaptation/resource.h" +#include "api/field_trials_view.h" +#include "api/rtp_sender_interface.h" +#include "api/sequence_checker.h" +#include "api/task_queue/pending_task_safety_flag.h" +#include "api/units/data_rate.h" +#include "api/video/encoded_image.h" +#include "api/video/video_bitrate_allocator.h" +#include "api/video/video_rotation.h" +#include "api/video/video_sink_interface.h" +#include "api/video/video_stream_encoder_settings.h" +#include "api/video_codecs/video_codec.h" +#include "api/video_codecs/video_encoder.h" +#include "call/adaptation/adaptation_constraint.h" +#include "call/adaptation/resource_adaptation_processor.h" +#include "call/adaptation/resource_adaptation_processor_interface.h" +#include "call/adaptation/video_source_restrictions.h" +#include "call/adaptation/video_stream_input_state_provider.h" +#include "modules/video_coding/utility/frame_dropper.h" +#include "modules/video_coding/utility/qp_parser.h" +#include "rtc_base/experiments/rate_control_settings.h" +#include "rtc_base/numerics/exp_filter.h" +#include "rtc_base/race_checker.h" +#include "rtc_base/rate_statistics.h" +#include "rtc_base/task_queue.h" +#include "rtc_base/thread_annotations.h" +#include "system_wrappers/include/clock.h" +#include "video/adaptation/video_stream_encoder_resource_manager.h" +#include "video/encoder_bitrate_adjuster.h" +#include "video/frame_cadence_adapter.h" +#include "video/frame_encode_metadata_writer.h" +#include "video/video_source_sink_controller.h" +#include "video/video_stream_encoder_interface.h" +#include "video/video_stream_encoder_observer.h" + +namespace webrtc { + +// VideoStreamEncoder represent a video encoder that accepts raw video frames as +// input and produces an encoded bit stream. +// Usage: +// Instantiate. +// Call SetSink. +// Call SetSource. +// Call ConfigureEncoder with the codec settings. +// Call Stop() when done. +class VideoStreamEncoder : public VideoStreamEncoderInterface, + private EncodedImageCallback, + public VideoSourceRestrictionsListener { + public: + // TODO(bugs.webrtc.org/12000): Reporting of VideoBitrateAllocation is being + // deprecated. Instead VideoLayersAllocation should be reported. + enum class BitrateAllocationCallbackType { + kVideoBitrateAllocation, + kVideoBitrateAllocationWhenScreenSharing, + kVideoLayersAllocation + }; + VideoStreamEncoder( + Clock* clock, + uint32_t number_of_cores, + VideoStreamEncoderObserver* encoder_stats_observer, + const VideoStreamEncoderSettings& settings, + std::unique_ptr<OveruseFrameDetector> overuse_detector, + std::unique_ptr<FrameCadenceAdapterInterface> frame_cadence_adapter, + std::unique_ptr<webrtc::TaskQueueBase, webrtc::TaskQueueDeleter> + encoder_queue, + BitrateAllocationCallbackType allocation_cb_type, + const FieldTrialsView& field_trials, + webrtc::VideoEncoderFactory::EncoderSelectorInterface* encoder_selector = + nullptr); + ~VideoStreamEncoder() override; + + VideoStreamEncoder(const VideoStreamEncoder&) = delete; + VideoStreamEncoder& operator=(const VideoStreamEncoder&) = delete; + + void AddAdaptationResource(rtc::scoped_refptr<Resource> resource) override; + std::vector<rtc::scoped_refptr<Resource>> GetAdaptationResources() override; + + void SetSource(rtc::VideoSourceInterface<VideoFrame>* source, + const DegradationPreference& degradation_preference) override; + + void SetSink(EncoderSink* sink, bool rotation_applied) override; + + // TODO(perkj): Can we remove VideoCodec.startBitrate ? + void SetStartBitrate(int start_bitrate_bps) override; + + void SetFecControllerOverride( + FecControllerOverride* fec_controller_override) override; + + void ConfigureEncoder(VideoEncoderConfig config, + size_t max_data_payload_length) override; + void ConfigureEncoder(VideoEncoderConfig config, + size_t max_data_payload_length, + SetParametersCallback callback) override; + + // Permanently stop encoding. After this method has returned, it is + // guaranteed that no encoded frames will be delivered to the sink. + void Stop() override; + + void SendKeyFrame(const std::vector<VideoFrameType>& layers = {}) override; + + void OnLossNotification( + const VideoEncoder::LossNotification& loss_notification) override; + + void OnBitrateUpdated(DataRate target_bitrate, + DataRate stable_target_bitrate, + DataRate target_headroom, + uint8_t fraction_lost, + int64_t round_trip_time_ms, + double cwnd_reduce_ratio) override; + + DataRate UpdateTargetBitrate(DataRate target_bitrate, + double cwnd_reduce_ratio); + + protected: + // Used for testing. For example the `ScalingObserverInterface` methods must + // be called on `encoder_queue_`. + TaskQueueBase* encoder_queue() { return encoder_queue_.Get(); } + + void OnVideoSourceRestrictionsUpdated( + VideoSourceRestrictions restrictions, + const VideoAdaptationCounters& adaptation_counters, + rtc::scoped_refptr<Resource> reason, + const VideoSourceRestrictions& unfiltered_restrictions) override; + + // Used for injected test resources. + // TODO(eshr): Move all adaptation tests out of VideoStreamEncoder tests. + void InjectAdaptationResource(rtc::scoped_refptr<Resource> resource, + VideoAdaptationReason reason); + void InjectAdaptationConstraint(AdaptationConstraint* adaptation_constraint); + + void AddRestrictionsListenerForTesting( + VideoSourceRestrictionsListener* restrictions_listener); + void RemoveRestrictionsListenerForTesting( + VideoSourceRestrictionsListener* restrictions_listener); + + private: + class CadenceCallback : public FrameCadenceAdapterInterface::Callback { + public: + explicit CadenceCallback(VideoStreamEncoder& video_stream_encoder) + : video_stream_encoder_(video_stream_encoder) {} + // FrameCadenceAdapterInterface::Callback overrides. + void OnFrame(Timestamp post_time, + int frames_scheduled_for_processing, + const VideoFrame& frame) override { + video_stream_encoder_.OnFrame(post_time, frames_scheduled_for_processing, + frame); + } + void OnDiscardedFrame() override { + video_stream_encoder_.OnDiscardedFrame(); + } + void RequestRefreshFrame() override { + video_stream_encoder_.RequestRefreshFrame(); + } + + private: + VideoStreamEncoder& video_stream_encoder_; + }; + + class VideoFrameInfo { + public: + VideoFrameInfo(int width, int height, bool is_texture) + : width(width), height(height), is_texture(is_texture) {} + int width; + int height; + bool is_texture; + int pixel_count() const { return width * height; } + }; + + struct EncoderRateSettings { + EncoderRateSettings(); + EncoderRateSettings(const VideoBitrateAllocation& bitrate, + double framerate_fps, + DataRate bandwidth_allocation, + DataRate encoder_target, + DataRate stable_encoder_target); + bool operator==(const EncoderRateSettings& rhs) const; + bool operator!=(const EncoderRateSettings& rhs) const; + + VideoEncoder::RateControlParameters rate_control; + // This is the scalar target bitrate before the VideoBitrateAllocator, i.e. + // the `target_bitrate` argument of the OnBitrateUpdated() method. This is + // needed because the bitrate allocator may truncate the total bitrate and a + // later call to the same allocator instance, e.g. + // |using last_encoder_rate_setings_->bitrate.get_sum_bps()|, may trick it + // into thinking the available bitrate has decreased since the last call. + DataRate encoder_target; + DataRate stable_encoder_target; + }; + + class DegradationPreferenceManager; + + void ReconfigureEncoder() RTC_RUN_ON(&encoder_queue_); + void OnEncoderSettingsChanged() RTC_RUN_ON(&encoder_queue_); + void OnFrame(Timestamp post_time, + int frames_scheduled_for_processing, + const VideoFrame& video_frame); + void OnDiscardedFrame(); + void RequestRefreshFrame(); + + void MaybeEncodeVideoFrame(const VideoFrame& frame, + int64_t time_when_posted_in_ms); + + void EncodeVideoFrame(const VideoFrame& frame, + int64_t time_when_posted_in_ms); + // Indicates whether frame should be dropped because the pixel count is too + // large for the current bitrate configuration. + bool DropDueToSize(uint32_t pixel_count) const RTC_RUN_ON(&encoder_queue_); + + // Implements EncodedImageCallback. + EncodedImageCallback::Result OnEncodedImage( + const EncodedImage& encoded_image, + const CodecSpecificInfo* codec_specific_info) override; + + void OnDroppedFrame(EncodedImageCallback::DropReason reason) override; + + bool EncoderPaused() const; + void TraceFrameDropStart(); + void TraceFrameDropEnd(); + + // Returns a copy of `rate_settings` with the `bitrate` field updated using + // the current VideoBitrateAllocator. + EncoderRateSettings UpdateBitrateAllocation( + const EncoderRateSettings& rate_settings) RTC_RUN_ON(&encoder_queue_); + + uint32_t GetInputFramerateFps() RTC_RUN_ON(&encoder_queue_); + void SetEncoderRates(const EncoderRateSettings& rate_settings) + RTC_RUN_ON(&encoder_queue_); + + void RunPostEncode(const EncodedImage& encoded_image, + int64_t time_sent_us, + int temporal_index, + DataSize frame_size); + void ReleaseEncoder() RTC_RUN_ON(&encoder_queue_); + // After calling this function `resource_adaptation_processor_` will be null. + void ShutdownResourceAdaptationQueue(); + + void CheckForAnimatedContent(const VideoFrame& frame, + int64_t time_when_posted_in_ms) + RTC_RUN_ON(&encoder_queue_); + + void RequestEncoderSwitch() RTC_RUN_ON(&encoder_queue_); + + // Augments an EncodedImage received from an encoder with parsable + // information. + EncodedImage AugmentEncodedImage( + const EncodedImage& encoded_image, + const CodecSpecificInfo* codec_specific_info); + + const FieldTrialsView& field_trials_; + TaskQueueBase* const worker_queue_; + + const int number_of_cores_; + + EncoderSink* sink_; + const VideoStreamEncoderSettings settings_; + const BitrateAllocationCallbackType allocation_cb_type_; + const RateControlSettings rate_control_settings_; + + webrtc::VideoEncoderFactory::EncoderSelectorInterface* const + encoder_selector_from_constructor_; + std::unique_ptr<VideoEncoderFactory::EncoderSelectorInterface> const + encoder_selector_from_factory_; + // Pointing to either encoder_selector_from_constructor_ or + // encoder_selector_from_factory_ but can be nullptr. + VideoEncoderFactory::EncoderSelectorInterface* const encoder_selector_; + + VideoStreamEncoderObserver* const encoder_stats_observer_; + // Adapter that avoids public inheritance of the cadence adapter's callback + // interface. + CadenceCallback cadence_callback_; + // Frame cadence encoder adapter. Frames enter this adapter first, and it then + // forwards them to our OnFrame method. + std::unique_ptr<FrameCadenceAdapterInterface> frame_cadence_adapter_ + RTC_GUARDED_BY(&encoder_queue_) RTC_PT_GUARDED_BY(&encoder_queue_); + + VideoEncoderConfig encoder_config_ RTC_GUARDED_BY(&encoder_queue_); + std::unique_ptr<VideoEncoder> encoder_ RTC_GUARDED_BY(&encoder_queue_) + RTC_PT_GUARDED_BY(&encoder_queue_); + bool encoder_initialized_; + std::unique_ptr<VideoBitrateAllocator> rate_allocator_ + RTC_GUARDED_BY(&encoder_queue_) RTC_PT_GUARDED_BY(&encoder_queue_); + int max_framerate_ RTC_GUARDED_BY(&encoder_queue_); + + // Set when ConfigureEncoder has been called in order to lazy reconfigure the + // encoder on the next frame. + bool pending_encoder_reconfiguration_ RTC_GUARDED_BY(&encoder_queue_); + // Set when configuration must create a new encoder object, e.g., + // because of a codec change. + bool pending_encoder_creation_ RTC_GUARDED_BY(&encoder_queue_); + absl::InlinedVector<SetParametersCallback, 2> encoder_configuration_callbacks_ + RTC_GUARDED_BY(&encoder_queue_); + + absl::optional<VideoFrameInfo> last_frame_info_ + RTC_GUARDED_BY(&encoder_queue_); + int crop_width_ RTC_GUARDED_BY(&encoder_queue_); + int crop_height_ RTC_GUARDED_BY(&encoder_queue_); + absl::optional<uint32_t> encoder_target_bitrate_bps_ + RTC_GUARDED_BY(&encoder_queue_); + size_t max_data_payload_length_ RTC_GUARDED_BY(&encoder_queue_); + absl::optional<EncoderRateSettings> last_encoder_rate_settings_ + RTC_GUARDED_BY(&encoder_queue_); + bool encoder_paused_and_dropped_frame_ RTC_GUARDED_BY(&encoder_queue_); + + // Set to true if at least one frame was sent to encoder since last encoder + // initialization. + bool was_encode_called_since_last_initialization_ + RTC_GUARDED_BY(&encoder_queue_); + + bool encoder_failed_ RTC_GUARDED_BY(&encoder_queue_); + Clock* const clock_; + + // Used to make sure incoming time stamp is increasing for every frame. + int64_t last_captured_timestamp_ RTC_GUARDED_BY(&encoder_queue_); + // Delta used for translating between NTP and internal timestamps. + const int64_t delta_ntp_internal_ms_ RTC_GUARDED_BY(&encoder_queue_); + + int64_t last_frame_log_ms_ RTC_GUARDED_BY(&encoder_queue_); + int captured_frame_count_ RTC_GUARDED_BY(&encoder_queue_); + int dropped_frame_cwnd_pushback_count_ RTC_GUARDED_BY(&encoder_queue_); + int dropped_frame_encoder_block_count_ RTC_GUARDED_BY(&encoder_queue_); + absl::optional<VideoFrame> pending_frame_ RTC_GUARDED_BY(&encoder_queue_); + int64_t pending_frame_post_time_us_ RTC_GUARDED_BY(&encoder_queue_); + + VideoFrame::UpdateRect accumulated_update_rect_ + RTC_GUARDED_BY(&encoder_queue_); + bool accumulated_update_rect_is_valid_ RTC_GUARDED_BY(&encoder_queue_); + + // Used for automatic content type detection. + absl::optional<VideoFrame::UpdateRect> last_update_rect_ + RTC_GUARDED_BY(&encoder_queue_); + Timestamp animation_start_time_ RTC_GUARDED_BY(&encoder_queue_); + bool cap_resolution_due_to_video_content_ RTC_GUARDED_BY(&encoder_queue_); + // Used to correctly ignore changes in update_rect introduced by + // resize triggered by animation detection. + enum class ExpectResizeState { + kNoResize, // Normal operation. + kResize, // Resize was triggered by the animation detection. + kFirstFrameAfterResize // Resize observed. + } expect_resize_state_ RTC_GUARDED_BY(&encoder_queue_); + + FecControllerOverride* fec_controller_override_ + RTC_GUARDED_BY(&encoder_queue_); + absl::optional<int64_t> last_parameters_update_ms_ + RTC_GUARDED_BY(&encoder_queue_); + absl::optional<int64_t> last_encode_info_ms_ RTC_GUARDED_BY(&encoder_queue_); + + VideoEncoder::EncoderInfo encoder_info_ RTC_GUARDED_BY(&encoder_queue_); + VideoCodec send_codec_ RTC_GUARDED_BY(&encoder_queue_); + + FrameDropper frame_dropper_ RTC_GUARDED_BY(&encoder_queue_); + // If frame dropper is not force disabled, frame dropping might still be + // disabled if VideoEncoder::GetEncoderInfo() indicates that the encoder has a + // trusted rate controller. This is determined on a per-frame basis, as the + // encoder behavior might dynamically change. + bool force_disable_frame_dropper_ RTC_GUARDED_BY(&encoder_queue_); + // Incremented on worker thread whenever `frame_dropper_` determines that a + // frame should be dropped. Decremented on whichever thread runs + // OnEncodedImage(), which is only called by one thread but not necessarily + // the worker thread. + std::atomic<int> pending_frame_drops_; + + // Congestion window frame drop ratio (drop 1 in every + // cwnd_frame_drop_interval_ frames). + absl::optional<int> cwnd_frame_drop_interval_ RTC_GUARDED_BY(&encoder_queue_); + // Frame counter for congestion window frame drop. + int cwnd_frame_counter_ RTC_GUARDED_BY(&encoder_queue_); + + std::unique_ptr<EncoderBitrateAdjuster> bitrate_adjuster_ + RTC_GUARDED_BY(&encoder_queue_); + + // TODO(sprang): Change actually support keyframe per simulcast stream, or + // turn this into a simple bool `pending_keyframe_request_`. + std::vector<VideoFrameType> next_frame_types_ RTC_GUARDED_BY(&encoder_queue_); + + FrameEncodeMetadataWriter frame_encode_metadata_writer_; + + // Experiment groups parsed from field trials for realtime video ([0]) and + // screenshare ([1]). 0 means no group specified. Positive values are + // experiment group numbers incremented by 1. + const std::array<uint8_t, 2> experiment_groups_; + + struct AutomaticAnimationDetectionExperiment { + bool enabled = false; + int min_duration_ms = 2000; + double min_area_ratio = 0.8; + int min_fps = 10; + std::unique_ptr<StructParametersParser> Parser() { + return StructParametersParser::Create( + "enabled", &enabled, // + "min_duration_ms", &min_duration_ms, // + "min_area_ratio", &min_area_ratio, // + "min_fps", &min_fps); + } + }; + + AutomaticAnimationDetectionExperiment + ParseAutomatincAnimationDetectionFieldTrial() const; + + AutomaticAnimationDetectionExperiment + automatic_animation_detection_experiment_ RTC_GUARDED_BY(&encoder_queue_); + + // Provides video stream input states: current resolution and frame rate. + VideoStreamInputStateProvider input_state_provider_; + + const std::unique_ptr<VideoStreamAdapter> video_stream_adapter_ + RTC_GUARDED_BY(&encoder_queue_); + // Responsible for adapting input resolution or frame rate to ensure resources + // (e.g. CPU or bandwidth) are not overused. Adding resources can occur on any + // thread. + std::unique_ptr<ResourceAdaptationProcessorInterface> + resource_adaptation_processor_ RTC_GUARDED_BY(&encoder_queue_); + std::unique_ptr<DegradationPreferenceManager> degradation_preference_manager_ + RTC_GUARDED_BY(&encoder_queue_); + std::vector<AdaptationConstraint*> adaptation_constraints_ + RTC_GUARDED_BY(&encoder_queue_); + // Handles input, output and stats reporting related to VideoStreamEncoder + // specific resources, such as "encode usage percent" measurements and "QP + // scaling". Also involved with various mitigations such as initial frame + // dropping. + // The manager primarily operates on the `encoder_queue_` but its lifetime is + // tied to the VideoStreamEncoder (which is destroyed off the encoder queue) + // and its resource list is accessible from any thread. + VideoStreamEncoderResourceManager stream_resource_manager_ + RTC_GUARDED_BY(&encoder_queue_); + std::vector<rtc::scoped_refptr<Resource>> additional_resources_ + RTC_GUARDED_BY(&encoder_queue_); + // Carries out the VideoSourceRestrictions provided by the + // ResourceAdaptationProcessor, i.e. reconfigures the source of video frames + // to provide us with different resolution or frame rate. + // This class is thread-safe. + VideoSourceSinkController video_source_sink_controller_ + RTC_GUARDED_BY(worker_queue_); + + // Default bitrate limits in EncoderInfoSettings allowed. + const bool default_limits_allowed_; + + // QP parser is used to extract QP value from encoded frame when that is not + // provided by encoder. + QpParser qp_parser_; + const bool qp_parsing_allowed_; + + // Enables encoder switching on initialization failures. + bool switch_encoder_on_init_failures_; + + const absl::optional<int> vp9_low_tier_core_threshold_; + + // These are copies of restrictions (glorified max_pixel_count) set by + // a) OnVideoSourceRestrictionsUpdated + // b) CheckForAnimatedContent + // They are used to scale down encoding resolution if needed when using + // requested_resolution. + // + // TODO(webrtc:14451) Split video_source_sink_controller_ + // so that ownership on restrictions/wants is kept on &encoder_queue_, that + // these extra copies would not be needed. + absl::optional<VideoSourceRestrictions> latest_restrictions_ + RTC_GUARDED_BY(&encoder_queue_); + absl::optional<VideoSourceRestrictions> animate_restrictions_ + RTC_GUARDED_BY(&encoder_queue_); + + // Used to cancel any potentially pending tasks to the worker thread. + // Refrenced by tasks running on `encoder_queue_` so need to be destroyed + // after stopping that queue. Must be created and destroyed on + // `worker_queue_`. + ScopedTaskSafety task_safety_; + + // Public methods are proxied to the task queues. The queues must be destroyed + // first to make sure no tasks run that use other members. + rtc::TaskQueue encoder_queue_; +}; + +} // namespace webrtc + +#endif // VIDEO_VIDEO_STREAM_ENCODER_H_ |