67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
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/* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_SCREENSHARE_LAYERS_H_
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#define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_SCREENSHARE_LAYERS_H_
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#include "webrtc/modules/video_coding/codecs/vp9/vp9_impl.h"
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namespace webrtc {
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class ScreenshareLayersVP9 {
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public:
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explicit ScreenshareLayersVP9(uint8_t num_layers);
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// The target bitrate for layer with id layer_id.
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void ConfigureBitrate(int threshold_kbps, uint8_t layer_id);
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// The current start layer.
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uint8_t GetStartLayer() const;
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// Update the layer with the size of the layer frame.
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void LayerFrameEncoded(unsigned int size_bytes, uint8_t layer_id);
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// Get the layer settings for the next superframe.
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//
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// In short, each time the GetSuperFrameSettings is called the
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// bitrate of every layer is calculated and if the cummulative
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// bitrate exceeds the configured cummulative bitrates
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// (ConfigureBitrate to configure) up to and including that
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// layer then the resulting encoding settings for the
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// superframe will only encode layers above that layer.
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VP9EncoderImpl::SuperFrameRefSettings GetSuperFrameSettings(
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uint32_t timestamp,
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bool is_keyframe);
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private:
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// How many layers that are used.
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uint8_t num_layers_;
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// The index of the first layer to encode.
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uint8_t start_layer_;
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// Cummulative target kbps for the different layers.
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float threshold_kbps_[kMaxVp9NumberOfSpatialLayers - 1];
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// How many bits that has been used for a certain layer. Increased in
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// FrameEncoded() by the size of the encoded frame and decreased in
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// GetSuperFrameSettings() depending on the time between frames.
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float bits_used_[kMaxVp9NumberOfSpatialLayers];
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// Timestamp of last frame.
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uint32_t last_timestamp_;
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// If the last_timestamp_ has been set.
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bool timestamp_initialized_;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP9_SCREENSHARE_LAYERS_H_
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