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/*
* Copyright (c) 2014 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 MEDIA_ENGINE_SIMULCAST_ENCODER_ADAPTER_H_
#define MEDIA_ENGINE_SIMULCAST_ENCODER_ADAPTER_H_
#include <memory>
#include <stack>
#include <string>
#include <utility>
#include <vector>
#include "absl/types/optional.h"
#include "api/fec_controller_override.h"
#include "api/video_codecs/sdp_video_format.h"
#include "api/video_codecs/video_encoder.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "modules/video_coding/utility/framerate_controller.h"
#include "rtc_base/atomic_ops.h"
#include "rtc_base/synchronization/sequence_checker.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
class SimulcastRateAllocator;
class VideoEncoderFactory;
// SimulcastEncoderAdapter implements simulcast support by creating multiple
// webrtc::VideoEncoder instances with the given VideoEncoderFactory.
// The object is created and destroyed on the worker thread, but all public
// interfaces should be called from the encoder task queue.
class RTC_EXPORT SimulcastEncoderAdapter : public VideoEncoder {
public:
// TODO(bugs.webrtc.org/11000): Remove when downstream usage is gone.
SimulcastEncoderAdapter(VideoEncoderFactory* primarty_factory,
const SdpVideoFormat& format);
// |primary_factory| produces the first-choice encoders to use.
// |fallback_factory|, if non-null, is used to create fallback encoder that
// will be used if InitEncode() fails for the primary encoder.
SimulcastEncoderAdapter(VideoEncoderFactory* primary_factory,
VideoEncoderFactory* fallback_factory,
const SdpVideoFormat& format);
~SimulcastEncoderAdapter() override;
// Implements VideoEncoder.
void SetFecControllerOverride(
FecControllerOverride* fec_controller_override) override;
int Release() override;
int InitEncode(const VideoCodec* codec_settings,
const VideoEncoder::Settings& settings) override;
int Encode(const VideoFrame& input_image,
const std::vector<VideoFrameType>* frame_types) override;
int RegisterEncodeCompleteCallback(EncodedImageCallback* callback) override;
void SetRates(const RateControlParameters& parameters) override;
void OnPacketLossRateUpdate(float packet_loss_rate) override;
void OnRttUpdate(int64_t rtt_ms) override;
void OnLossNotification(const LossNotification& loss_notification) override;
// Eventual handler for the contained encoders' EncodedImageCallbacks, but
// called from an internal helper that also knows the correct stream
// index.
EncodedImageCallback::Result OnEncodedImage(
size_t stream_idx,
const EncodedImage& encoded_image,
const CodecSpecificInfo* codec_specific_info,
const RTPFragmentationHeader* fragmentation);
EncoderInfo GetEncoderInfo() const override;
private:
struct StreamInfo {
StreamInfo(std::unique_ptr<VideoEncoder> encoder,
std::unique_ptr<EncodedImageCallback> callback,
std::unique_ptr<FramerateController> framerate_controller,
uint16_t width,
uint16_t height,
bool send_stream)
: encoder(std::move(encoder)),
callback(std::move(callback)),
framerate_controller(std::move(framerate_controller)),
width(width),
height(height),
key_frame_request(false),
send_stream(send_stream) {}
std::unique_ptr<VideoEncoder> encoder;
std::unique_ptr<EncodedImageCallback> callback;
std::unique_ptr<FramerateController> framerate_controller;
uint16_t width;
uint16_t height;
bool key_frame_request;
bool send_stream;
};
enum class StreamResolution {
OTHER,
HIGHEST,
LOWEST,
};
// Populate the codec settings for each simulcast stream.
void PopulateStreamCodec(const webrtc::VideoCodec& inst,
int stream_index,
uint32_t start_bitrate_kbps,
StreamResolution stream_resolution,
webrtc::VideoCodec* stream_codec);
bool Initialized() const;
void DestroyStoredEncoders();
volatile int inited_; // Accessed atomically.
VideoEncoderFactory* const primary_encoder_factory_;
VideoEncoderFactory* const fallback_encoder_factory_;
const SdpVideoFormat video_format_;
VideoCodec codec_;
std::vector<StreamInfo> streaminfos_;
EncodedImageCallback* encoded_complete_callback_;
// Used for checking the single-threaded access of the encoder interface.
SequenceChecker encoder_queue_;
// Store encoders in between calls to Release and InitEncode, so they don't
// have to be recreated. Remaining encoders are destroyed by the destructor.
std::stack<std::unique_ptr<VideoEncoder>> stored_encoders_;
const absl::optional<unsigned int> experimental_boosted_screenshare_qp_;
const bool boost_base_layer_quality_;
};
} // namespace webrtc
#endif // MEDIA_ENGINE_SIMULCAST_ENCODER_ADAPTER_H_