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