Revert of Work on flexible mode and screen sharing.

webrtc/modules/video_coding/codecs/vp9/screenshare_layers.h

-/* Copyright (c) 2015 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 WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_SCREENSHARE_LAYERS_H_
-#define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_SCREENSHARE_LAYERS_H_
-
-#include "webrtc/modules/video_coding/codecs/vp9/vp9_impl.h"
-
-namespace webrtc {
-
-class ScreenshareLayersVP9 {
- public:
-  explicit ScreenshareLayersVP9(uint8_t num_layers);
-
-  // The target bitrate for layer with id layer_id.
-  void ConfigureBitrate(int threshold_kbps, uint8_t layer_id);
-
-  // The current start layer.
-  uint8_t GetStartLayer() const;
-
-  // Update the layer with the size of the layer frame.
-  void LayerFrameEncoded(unsigned int size_bytes, uint8_t layer_id);
-
-  // Get the layer settings for the next superframe.
-  //
-  // In short, each time the GetSuperFrameSettings is called the
-  // bitrate of every layer is calculated and if the cummulative
-  // bitrate exceeds the configured cummulative bitrates
-  // (ConfigureBitrate to configure) up to and including that
-  // layer then the resulting encoding settings for the
-  // superframe will only encode layers above that layer.
-  VP9EncoderImpl::SuperFrameRefSettings GetSuperFrameSettings(
-      uint32_t timestamp,
-      bool is_keyframe);
-
- private:
-  // How many layers that are used.
-  uint8_t num_layers_;
-
-  // The index of the first layer to encode.
-  uint8_t start_layer_;
-
-  // Cummulative target kbps for the different layers.
-  float threshold_kbps_[kMaxVp9NumberOfSpatialLayers - 1];
-
-  // How many bits that has been used for a certain layer. Increased in
-  // FrameEncoded() by the size of the encoded frame and decreased in
-  // GetSuperFrameSettings() depending on the time between frames.
-  float bits_used_[kMaxVp9NumberOfSpatialLayers];
-
-  // Timestamp of last frame.
-  uint32_t last_timestamp_;
-
-  // If the last_timestamp_ has been set.
-  bool timestamp_initialized_;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_SCREENSHARE_LAYERS_H_