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/*
* Copyright (c) 2021, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#ifndef AOM_AV1_RATECTRL_RTC_H_
#define AOM_AV1_RATECTRL_RTC_H_
#include <cstdint>
#include <memory>
struct AV1_COMP;
namespace aom {
// These constants come from AV1 spec.
static constexpr size_t kAV1MaxLayers = 32;
static constexpr size_t kAV1MaxTemporalLayers = 8;
static constexpr size_t kAV1MaxSpatialLayers = 4;
enum FrameType { kKeyFrame, kInterFrame };
struct AV1RateControlRtcConfig {
public:
AV1RateControlRtcConfig();
int width;
int height;
// Flag indicating if the content is screen or not.
bool is_screen = false;
// 0-63
int max_quantizer;
int min_quantizer;
int64_t target_bandwidth;
int64_t buf_initial_sz;
int64_t buf_optimal_sz;
int64_t buf_sz;
int undershoot_pct;
int overshoot_pct;
int max_intra_bitrate_pct;
int max_inter_bitrate_pct;
int frame_drop_thresh;
int max_consec_drop;
double framerate;
int layer_target_bitrate[kAV1MaxLayers];
int ts_rate_decimator[kAV1MaxTemporalLayers];
int aq_mode;
// Number of spatial layers
int ss_number_layers;
// Number of temporal layers
int ts_number_layers;
int max_quantizers[kAV1MaxLayers];
int min_quantizers[kAV1MaxLayers];
int scaling_factor_num[kAV1MaxSpatialLayers];
int scaling_factor_den[kAV1MaxSpatialLayers];
};
struct AV1FrameParamsRTC {
FrameType frame_type;
int spatial_layer_id;
int temporal_layer_id;
};
struct AV1LoopfilterLevel {
int filter_level[2];
int filter_level_u;
int filter_level_v;
};
struct AV1CdefInfo {
int cdef_strength_y;
int cdef_strength_uv;
int damping;
};
struct AV1SegmentationData {
const uint8_t *segmentation_map;
size_t segmentation_map_size;
const int *delta_q;
size_t delta_q_size;
};
enum class FrameDropDecision {
kOk, // Frame is encoded.
kDrop, // Frame is dropped.
};
class AV1RateControlRTC {
public:
static std::unique_ptr<AV1RateControlRTC> Create(
const AV1RateControlRtcConfig &cfg);
~AV1RateControlRTC();
bool UpdateRateControl(const AV1RateControlRtcConfig &rc_cfg);
// GetQP() needs to be called after ComputeQP() to get the latest QP
int GetQP() const;
// GetLoopfilterLevel() needs to be called after ComputeQP()
AV1LoopfilterLevel GetLoopfilterLevel() const;
// GetCdefInfo() needs to be called after ComputeQP()
AV1CdefInfo GetCdefInfo() const;
// Returns the segmentation map used for cyclic refresh, based on 4x4 blocks.
bool GetSegmentationData(AV1SegmentationData *segmentation_data) const;
// ComputeQP returns the QP if the frame is not dropped (kOk return),
// otherwise it returns kDrop and subsequent GetQP and PostEncodeUpdate
// are not to be called (av1_rc_postencode_update_drop_frame is already
// called via ComputeQP if drop is decided).
FrameDropDecision ComputeQP(const AV1FrameParamsRTC &frame_params);
// Feedback to rate control with the size of current encoded frame
void PostEncodeUpdate(uint64_t encoded_frame_size);
private:
AV1RateControlRTC() = default;
bool InitRateControl(const AV1RateControlRtcConfig &cfg);
AV1_COMP *cpi_;
int initial_width_;
int initial_height_;
};
} // namespace aom
#endif // AOM_AV1_RATECTRL_RTC_H_
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