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* 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.
#include "vpx/vpx_codec.h"
#include "vpx/vpx_integer.h"
#include "vp9/common/vp9_blockd.h"
#ifdef __cplusplus
extern "C" {
// Bits Per MB at different Q (Multiplied by 512)
#define MAX_GF_INTERVAL 16
#define FIXED_GF_INTERVAL 8 // Used in some testing modes only
typedef enum {
KF_STD = 4,
// Internal frame scaling level.
typedef enum {
UNSCALED = 0, // Frame is unscaled.
SCALE_STEP1 = 1, // First-level down-scaling.
typedef enum {
DOWN_THREEFOUR = 1, // From orig to 3/4.
DOWN_ONEHALF = 2, // From orig or 3/4 to 1/2.
UP_THREEFOUR = -1, // From 1/2 to 3/4.
UP_ORIG = -2, // From 1/2 or 3/4 to orig.
typedef enum {
ORIG = 0,
// Frame dimensions multiplier wrt the native frame size, in 1/16ths,
// specified for the scale-up case.
// e.g. 24 => 16/24 = 2/3 of native size. The restriction to 1/16th is
// intended to match the capabilities of the normative scaling filters,
// giving precedence to the up-scaling accuracy.
static const int frame_scale_factor[FRAME_SCALE_STEPS] = {16, 24};
// Multiplier of the target rate to be used as threshold for triggering scaling.
static const double rate_thresh_mult[FRAME_SCALE_STEPS] = {1.0, 2.0};
// Scale dependent Rate Correction Factor multipliers. Compensates for the
// greater number of bits per pixel generated in down-scaled frames.
static const double rcf_mult[FRAME_SCALE_STEPS] = {1.0, 2.0};
typedef struct {
// Rate targetting variables
int base_frame_target; // A baseline frame target before adjustment
// for previous under or over shoot.
int this_frame_target; // Actual frame target after rc adjustment.
int projected_frame_size;
int sb64_target_rate;
int last_q[FRAME_TYPES]; // Separate values for Intra/Inter
int last_boosted_qindex; // Last boosted GF/KF/ARF q
int last_kf_qindex; // Q index of the last key frame coded.
int gfu_boost;
int last_boost;
int kf_boost;
double rate_correction_factors[RATE_FACTOR_LEVELS];
int frames_since_golden;
int frames_till_gf_update_due;
int min_gf_interval;
int max_gf_interval;
int static_scene_max_gf_interval;
int baseline_gf_interval;
int constrained_gf_group;
int frames_to_key;
int frames_since_key;
int this_key_frame_forced;
int next_key_frame_forced;
int source_alt_ref_pending;
int source_alt_ref_active;
int is_src_frame_alt_ref;
int avg_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[FRAME_TYPES];
double tot_q;
double avg_q;
int64_t buffer_level;
int64_t bits_off_target;
int64_t vbr_bits_off_target;
int64_t vbr_bits_off_target_fast;
int decimation_factor;
int decimation_count;
int rolling_target_bits;
int rolling_actual_bits;
int long_rolling_target_bits;
int long_rolling_actual_bits;
int rate_error_estimate;
int64_t total_actual_bits;
int64_t total_target_bits;
int64_t total_target_vs_actual;
int worst_quality;
int best_quality;
int64_t starting_buffer_level;
int64_t optimal_buffer_level;
int64_t maximum_buffer_size;
// rate control history for last frame(1) and the frame before(2).
// -1: undershot
// 1: overshoot
// 0: not initialized.
int rc_1_frame;
int rc_2_frame;
int q_1_frame;
int q_2_frame;
// Auto frame-scaling variables.
FRAME_SCALE_LEVEL frame_size_selector;
FRAME_SCALE_LEVEL next_frame_size_selector;
int frame_width[FRAME_SCALE_STEPS];
int frame_height[FRAME_SCALE_STEPS];
int rf_level_maxq[RATE_FACTOR_LEVELS];
uint64_t avg_source_sad;
int high_source_sad;
int count_last_scene_change;
int avg_frame_low_motion;
struct VP9_COMP;
struct VP9EncoderConfig;
void vp9_rc_init(const struct VP9EncoderConfig *oxcf, int pass,
int vp9_estimate_bits_at_q(FRAME_TYPE frame_kind, int q, int mbs,
double correction_factor,
vpx_bit_depth_t bit_depth);
double vp9_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth);
void vp9_rc_init_minq_luts(void);
int vp9_rc_get_default_min_gf_interval(int width, int height, double framerate);
// Note vp9_rc_get_default_max_gf_interval() requires the min_gf_interval to
// be passed in to ensure that the max_gf_interval returned is at least as bis
// as that.
int vp9_rc_get_default_max_gf_interval(double framerate, int min_frame_rate);
// Generally at the high level, the following flow is expected
// to be enforced for rate control:
// First call per frame, one of:
// vp9_rc_get_one_pass_vbr_params()
// vp9_rc_get_one_pass_cbr_params()
// vp9_rc_get_svc_params()
// vp9_rc_get_first_pass_params()
// vp9_rc_get_second_pass_params()
// depending on the usage to set the rate control encode parameters desired.
// Then, call encode_frame_to_data_rate() to perform the
// actual encode. This function will in turn call encode_frame()
// one or more times, followed by one of:
// vp9_rc_postencode_update()
// vp9_rc_postencode_update_drop_frame()
// The majority of rate control parameters are only expected
// to be set in the vp9_rc_get_..._params() functions and
// updated during the vp9_rc_postencode_update...() functions.
// The only exceptions are vp9_rc_drop_frame() and
// vp9_rc_update_rate_correction_factors() functions.
// Functions to set parameters for encoding before the actual
// encode_frame_to_data_rate() function.
void vp9_rc_get_one_pass_vbr_params(struct VP9_COMP *cpi);
void vp9_rc_get_one_pass_cbr_params(struct VP9_COMP *cpi);
void vp9_rc_get_svc_params(struct VP9_COMP *cpi);
// 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);
// Post encode update of the rate control parameters for dropped frames
void vp9_rc_postencode_update_drop_frame(struct VP9_COMP *cpi);
// Updates rate correction factors
// Changes only the rate correction factors in the rate control structure.
void vp9_rc_update_rate_correction_factors(struct VP9_COMP *cpi);
// Decide if we should drop this frame: For 1-pass CBR.
// Changes only the decimation count in the rate control structure
int vp9_rc_drop_frame(struct VP9_COMP *cpi);
// Computes frame size bounds.
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_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);
// 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, vpx_bit_depth_t bit_depth);
// Clamping utilities for bitrate targets for iframes and pframes.
int vp9_rc_clamp_iframe_target_size(const struct VP9_COMP *const cpi,
int target);
int vp9_rc_clamp_pframe_target_size(const struct VP9_COMP *const cpi,
int target);
// Utility to set frame_target into the RATE_CONTROL structure
// This function is called only from the vp9_rc_get_..._params() functions.
void vp9_rc_set_frame_target(struct VP9_COMP *cpi, int target);
// Computes a q delta (in "q index" terms) to get from a starting q value
// to a target q value
int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
vpx_bit_depth_t bit_depth);
// Computes a q delta (in "q index" terms) to get from a starting q value
// to a value that should equate to the given rate ratio.
int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
int qindex, double rate_target_ratio,
vpx_bit_depth_t bit_depth);
int vp9_frame_type_qdelta(const struct VP9_COMP *cpi, int rf_level, int q);
void vp9_rc_update_framerate(struct VP9_COMP *cpi);
void vp9_rc_set_gf_interval_range(const struct VP9_COMP *const cpi,
RATE_CONTROL *const rc);
void vp9_set_target_rate(struct VP9_COMP *cpi);
int vp9_resize_one_pass_cbr(struct VP9_COMP *cpi);
void vp9_avg_source_sad(struct VP9_COMP *cpi);
int vp9_encodedframe_overshoot(struct VP9_COMP *cpi, int frame_size, int *q);
#ifdef __cplusplus
} // extern "C"