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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 <vector>
#include "absl/container/inlined_vector.h"
#include "api/field_trials_view.h"
#include "api/units/data_rate.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"
namespace webrtc {
class SvcRateAllocator : public VideoBitrateAllocator {
public:
SvcRateAllocator(const VideoCodec& codec,
const FieldTrialsView& field_trials);
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 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_
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