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/* 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_
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