189 lines
6.4 KiB
C
189 lines
6.4 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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#include "vpx/vpx_integer.h"
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#include "vp9/common/vp9_blockd.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Bits Per MB at different Q (Multiplied by 512)
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#define BPER_MB_NORMBITS 9
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typedef struct {
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// Rate targetting variables
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int base_frame_target; // A baseline frame target before adjustment
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// for previous under or over shoot.
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int this_frame_target; // Actual frame target after rc adjustment.
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int projected_frame_size;
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int sb64_target_rate;
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int last_q[FRAME_TYPES]; // Separate values for Intra/Inter
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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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int frames_since_golden;
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int frames_till_gf_update_due;
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int max_gf_interval;
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int static_scene_max_gf_interval;
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int baseline_gf_interval;
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int frames_to_key;
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int frames_since_key;
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int this_key_frame_forced;
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int next_key_frame_forced;
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int source_alt_ref_pending;
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int source_alt_ref_active;
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int is_src_frame_alt_ref;
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int avg_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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int64_t buffer_level;
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int64_t bits_off_target;
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int64_t vbr_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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int64_t total_target_bits;
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int64_t total_target_vs_actual;
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int 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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struct VP9EncoderConfig;
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void vp9_rc_init(const struct VP9EncoderConfig *oxcf, int pass,
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RATE_CONTROL *rc);
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double vp9_convert_qindex_to_q(int qindex);
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void vp9_rc_init_minq_luts();
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// Generally at the high level, the following flow is expected
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// to be enforced for rate control:
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// First call per frame, one of:
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// vp9_rc_get_one_pass_vbr_params()
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// vp9_rc_get_one_pass_cbr_params()
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// vp9_rc_get_svc_params()
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// vp9_rc_get_first_pass_params()
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// vp9_rc_get_second_pass_params()
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// depending on the usage to set the rate control encode parameters desired.
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//
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// Then, call encode_frame_to_data_rate() to perform the
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// actual encode. This function will in turn call encode_frame()
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// one or more times, followed by one of:
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// vp9_rc_postencode_update()
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// vp9_rc_postencode_update_drop_frame()
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//
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// The majority of rate control parameters are only expected
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// to be set in the vp9_rc_get_..._params() functions and
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// updated during the vp9_rc_postencode_update...() functions.
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// The only exceptions are vp9_rc_drop_frame() and
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// vp9_rc_update_rate_correction_factors() functions.
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// Functions to set parameters for encoding before the actual
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// encode_frame_to_data_rate() function.
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void vp9_rc_get_one_pass_vbr_params(struct VP9_COMP *cpi);
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void vp9_rc_get_one_pass_cbr_params(struct VP9_COMP *cpi);
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void vp9_rc_get_svc_params(struct VP9_COMP *cpi);
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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, uint64_t bytes_used);
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// Post encode update of the rate control parameters for dropped frames
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void vp9_rc_postencode_update_drop_frame(struct VP9_COMP *cpi);
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// Updates rate correction factors
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// Changes only the rate correction factors in the rate control structure.
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void vp9_rc_update_rate_correction_factors(struct VP9_COMP *cpi, int damp_var);
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// Decide if we should drop this frame: For 1-pass CBR.
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// Changes only the decimation count in the rate control structure
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int vp9_rc_drop_frame(struct VP9_COMP *cpi);
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// Computes frame size bounds.
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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_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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// 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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// Clamping utilities for bitrate targets for iframes and pframes.
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int vp9_rc_clamp_iframe_target_size(const struct VP9_COMP *const cpi,
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int target);
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int vp9_rc_clamp_pframe_target_size(const struct VP9_COMP *const cpi,
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int target);
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// Utility to set frame_target into the RATE_CONTROL structure
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// This function is called only from the vp9_rc_get_..._params() functions.
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void vp9_rc_set_frame_target(struct VP9_COMP *cpi, int target);
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// Computes a q delta (in "q index" terms) to get from a starting q value
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// to a target q value
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int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget);
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// Computes a q delta (in "q index" terms) to get from a starting q value
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// to a value that should equate to the given rate ratio.
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int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
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int qindex, double rate_target_ratio);
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void vp9_rc_update_framerate(struct VP9_COMP *cpi);
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void vp9_rc_set_gf_max_interval(const struct VP9EncoderConfig *const oxcf,
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RATE_CONTROL *const rc);
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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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