svc_rate_allocator.h

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/*

 *  Copyright (c) 2018 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_SVC_SVC_RATE_ALLOCATOR_H_

#define MODULES_VIDEO_CODING_SVC_SVC_RATE_ALLOCATOR_H_

#include <stddef.h>

#include <stdint.h>

#include <vector>

#include "absl/container/inlined_vector.h"

#include "api/video/video_bitrate_allocation.h"

#include "api/video/video_bitrate_allocator.h"

#include "api/video/video_codec_constants.h"

#include "api/video_codecs/video_codec.h"

#include "rtc_base/experiments/stable_target_rate_experiment.h"

namespace webrtc {

class SvcRateAllocator : public VideoBitrateAllocator {

 public:

  explicit SvcRateAllocator(const VideoCodec& codec);

  VideoBitrateAllocation Allocate(

      VideoBitrateAllocationParameters parameters) override;

  static DataRate GetMaxBitrate(const VideoCodec& codec);

  static DataRate GetPaddingBitrate(const VideoCodec& codec);

  static absl::InlinedVector<DataRate, kMaxSpatialLayers> GetLayerStartBitrates(

      const VideoCodec& codec);

 private:

  struct NumLayers {

    size_t spatial = 1;

    size_t temporal = 1;

};

  static NumLayers GetNumLayers(const VideoCodec& codec);

  std::vector<DataRate> DistributeAllocationToSpatialLayersNormalVideo(

      DataRate total_bitrate,

      size_t first_active_layer,

      size_t num_spatial_layers) const;

  std::vector<DataRate> DistributeAllocationToSpatialLayersScreenSharing(

      DataRate total_bitrate,

      size_t first_active_layer,

      size_t num_spatial_layers) const;

  // Returns the number of layers that are active and have enough bitrate to

  // actually be enabled.

  size_t FindNumEnabledLayers(DataRate target_rate) const;

  const VideoCodec codec_;

  const NumLayers num_layers_;

  const StableTargetRateExperiment experiment_settings_;

  const absl::InlinedVector<DataRate, kMaxSpatialLayers>

      cumulative_layer_start_bitrates_;

  size_t last_active_layer_count_;

};

}  // namespace webrtc

#endif  // MODULES_VIDEO_CODING_SVC_SVC_RATE_ALLOCATOR_H_