ref: 85bd720a62531ac7eae7930fb51bb4c1afbee8a7
dir: /vp9/encoder/vp9_ratectrl.h/
/*
* Copyright (c) 2010 The WebM 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 VP9_ENCODER_VP9_RATECTRL_H_
#define VP9_ENCODER_VP9_RATECTRL_H_
#ifdef __cplusplus
extern "C" {
#endif
#define FRAME_OVERHEAD_BITS 200
typedef struct {
// Rate targetting variables
int this_frame_target;
int projected_frame_size;
int sb64_target_rate;
int last_q[3]; // Separate values for Intra/Inter/ARF-GF
int last_boosted_qindex; // Last boosted GF/KF/ARF q
int gfu_boost;
int last_boost;
int kf_boost;
double rate_correction_factor;
double key_frame_rate_correction_factor;
double gf_rate_correction_factor;
unsigned int frames_since_golden;
unsigned int frames_till_gf_update_due; // Count down till next GF
unsigned int max_gf_interval;
unsigned int baseline_gf_interval;
unsigned int frames_to_key;
unsigned int frames_since_key;
unsigned int this_key_frame_forced;
unsigned int next_key_frame_forced;
unsigned int source_alt_ref_pending;
unsigned int source_alt_ref_active;
unsigned int is_src_frame_alt_ref;
int per_frame_bandwidth; // Current section per frame bandwidth target
int av_per_frame_bandwidth; // Average frame size target for clip
int min_frame_bandwidth; // Minimum allocation used for any frame
int max_frame_bandwidth; // Maximum burst rate allowed for a frame.
int ni_av_qi;
int ni_tot_qi;
int ni_frames;
int avg_frame_qindex[3]; // 0 - KEY, 1 - INTER, 2 - ARF/GF
double tot_q;
double avg_q;
int buffer_level;
int bits_off_target;
int decimation_factor;
int decimation_count;
int rolling_target_bits;
int rolling_actual_bits;
int long_rolling_target_bits;
int long_rolling_actual_bits;
int64_t total_actual_bits;
int total_target_vs_actual; // debug stats
int worst_quality;
int active_worst_quality;
int best_quality;
// int active_best_quality;
} RATE_CONTROL;
struct VP9_COMP;
void vp9_save_coding_context(struct VP9_COMP *cpi);
void vp9_restore_coding_context(struct VP9_COMP *cpi);
void vp9_setup_key_frame(struct VP9_COMP *cpi);
void vp9_setup_inter_frame(struct VP9_COMP *cpi);
double vp9_convert_qindex_to_q(int qindex);
// Updates rate correction factors
void vp9_rc_update_rate_correction_factors(struct VP9_COMP *cpi, int damp_var);
// initialize luts for minq
void vp9_rc_init_minq_luts(void);
// return of 0 means drop frame
// Changes only rc.this_frame_target and rc.sb64_rate_target
int vp9_rc_pick_frame_size_target(struct VP9_COMP *cpi);
void vp9_rc_compute_frame_size_bounds(const struct VP9_COMP *cpi,
int this_frame_target,
int *frame_under_shoot_limit,
int *frame_over_shoot_limit);
// Picks q and q bounds given the target for bits
int vp9_rc_pick_q_and_adjust_q_bounds(const struct VP9_COMP *cpi,
int *bottom_index,
int *top_index);
// Estimates q to achieve a target bits per frame
int vp9_rc_regulate_q(const struct VP9_COMP *cpi, int target_bits_per_frame,
int active_best_quality, int active_worst_quality);
// Post encode update of the rate control parameters based
// on bytes used
void vp9_rc_postencode_update(struct VP9_COMP *cpi,
uint64_t bytes_used);
// for dropped frames
void vp9_rc_postencode_update_drop_frame(struct VP9_COMP *cpi);
// estimates bits per mb for a given qindex and correction factor
int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
double correction_factor);
// Post encode update of the rate control parameters for 2-pass
void vp9_twopass_postencode_update(struct VP9_COMP *cpi,
uint64_t bytes_used);
// Decide if we should drop this frame: For 1-pass CBR.
int vp9_drop_frame(struct VP9_COMP *cpi);
// Update the buffer level.
void vp9_update_buffer_level(struct VP9_COMP *cpi, int encoded_frame_size);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VP9_ENCODER_VP9_RATECTRL_H_