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+/*
+ * Copyright (c) 2016, 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_ENCODER_RATECTRL_H_
+#define AOM_AV1_ENCODER_RATECTRL_H_
+
+#include "aom/aom_codec.h"
+#include "aom/aom_integer.h"
+
+#include "av1/common/blockd.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Bits Per MB at different Q (Multiplied by 512)
+#define BPER_MB_NORMBITS 9
+
+#define CUSTOMIZED_GF 1
+
+#if CONFIG_FIX_GF_LENGTH
+#define FIXED_GF_LENGTH 16
+#define MAX_PYRAMID_LVL 4
+// We allow a frame to have at most two left/right descendants before changing
+// them into to a subtree, i.e., we allow the following structure:
+/* OUT_OF_ORDER_FRAME
+ / / \ \
+(two left children) F F F F (two right children) */
+// Therefore the max gf size supported by 4 layer structure is
+// 1 (KEY/OVERLAY) + 1 + 2 + 4 + 16 (two children on both side of their parent)
+#define MAX_PYRAMID_SIZE 24
+#define USE_SYMM_MULTI_LAYER 1
+#define REDUCE_LAST_ALT_BOOST 1
+#define REDUCE_LAST_GF_LENGTH 1
+#define MULTI_LVL_BOOST_VBR_CQ 1
+#else
+#define USE_SYMM_MULTI_LAYER 0
+#define REDUCE_LAST_ALT_BOOST 0
+#define REDUCE_LAST_GF_LENGTH 0
+#define MULTI_LVL_BOOST_VBR_CQ 0
+#endif
+
+#if USE_SYMM_MULTI_LAYER
+#define USE_MANUAL_GF4_STRUCT 0
+#endif
+
+#define MIN_GF_INTERVAL 4
+#define MAX_GF_INTERVAL 16
+#define FIXED_GF_INTERVAL 8 // Used in some testing modes only
+
+typedef enum {
+ INTER_NORMAL = 0,
+ INTER_LOW = 1,
+ INTER_HIGH = 2,
+ GF_ARF_LOW = 3,
+ GF_ARF_STD = 4,
+ KF_STD = 5,
+ RATE_FACTOR_LEVELS = 6
+} RATE_FACTOR_LEVEL;
+
+static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = {
+ 1.00, // INTER_NORMAL
+ 0.80, // INTER_LOW
+ 1.50, // INTER_HIGH
+ 1.25, // GF_ARF_LOW
+ 2.00, // GF_ARF_STD
+ 2.00, // KF_STD
+};
+
+typedef struct {
+ int resize_width;
+ int resize_height;
+ uint8_t superres_denom;
+} size_params_type;
+
+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 sframe_due;
+
+ // Length of the bi-predictive frame group interval
+ int bipred_group_interval;
+
+ // NOTE: Different types of frames may have different bits allocated
+ // accordingly, aiming to achieve the overall optimal RD performance.
+ int is_bwd_ref_frame;
+ int is_last_bipred_frame;
+ int is_bipred_frame;
+ int is_src_frame_ext_arf;
+
+ 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.
+ int rf_level_maxq[RATE_FACTOR_LEVELS];
+ float arf_boost_factor;
+ // Q index used for ALT frame
+ int arf_q;
+} RATE_CONTROL;
+
+struct AV1_COMP;
+struct AV1EncoderConfig;
+
+void av1_rc_init(const struct AV1EncoderConfig *oxcf, int pass,
+ RATE_CONTROL *rc);
+
+int av1_estimate_bits_at_q(FRAME_TYPE frame_kind, int q, int mbs,
+ double correction_factor, aom_bit_depth_t bit_depth);
+
+double av1_convert_qindex_to_q(int qindex, aom_bit_depth_t bit_depth);
+
+void av1_rc_init_minq_luts(void);
+
+int av1_rc_get_default_min_gf_interval(int width, int height, double framerate);
+// Note av1_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 av1_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:
+// av1_rc_get_one_pass_vbr_params()
+// av1_rc_get_one_pass_cbr_params()
+// av1_rc_get_first_pass_params()
+// av1_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:
+// av1_rc_postencode_update()
+// av1_rc_postencode_update_drop_frame()
+//
+// The majority of rate control parameters are only expected
+// to be set in the av1_rc_get_..._params() functions and
+// updated during the av1_rc_postencode_update...() functions.
+// The only exceptions are av1_rc_drop_frame() and
+// av1_rc_update_rate_correction_factors() functions.
+
+// Functions to set parameters for encoding before the actual
+// encode_frame_to_data_rate() function.
+void av1_rc_get_one_pass_vbr_params(struct AV1_COMP *cpi);
+void av1_rc_get_one_pass_cbr_params(struct AV1_COMP *cpi);
+
+// Post encode update of the rate control parameters based
+// on bytes used
+void av1_rc_postencode_update(struct AV1_COMP *cpi, uint64_t bytes_used);
+// Post encode update of the rate control parameters for dropped frames
+void av1_rc_postencode_update_drop_frame(struct AV1_COMP *cpi);
+
+// Updates rate correction factors
+// Changes only the rate correction factors in the rate control structure.
+void av1_rc_update_rate_correction_factors(struct AV1_COMP *cpi, int width,
+ int height);
+
+// Decide if we should drop this frame: For 1-pass CBR.
+// Changes only the decimation count in the rate control structure
+int av1_rc_drop_frame(struct AV1_COMP *cpi);
+
+// Computes frame size bounds.
+void av1_rc_compute_frame_size_bounds(const struct AV1_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 av1_rc_pick_q_and_bounds(struct AV1_COMP *cpi, int width, int height,
+ int *bottom_index, int *top_index);
+
+// Estimates q to achieve a target bits per frame
+int av1_rc_regulate_q(const struct AV1_COMP *cpi, int target_bits_per_frame,
+ int active_best_quality, int active_worst_quality,
+ int width, int height);
+
+// Estimates bits per mb for a given qindex and correction factor.
+int av1_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex,
+ double correction_factor, aom_bit_depth_t bit_depth);
+
+// Clamping utilities for bitrate targets for iframes and pframes.
+int av1_rc_clamp_iframe_target_size(const struct AV1_COMP *const cpi,
+ int target);
+int av1_rc_clamp_pframe_target_size(const struct AV1_COMP *const cpi,
+ int target);
+// Utility to set frame_target into the RATE_CONTROL structure
+// This function is called only from the av1_rc_get_..._params() functions.
+void av1_rc_set_frame_target(struct AV1_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 av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget,
+ aom_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 av1_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type,
+ int qindex, double rate_target_ratio,
+ aom_bit_depth_t bit_depth);
+
+int av1_frame_type_qdelta(const struct AV1_COMP *cpi, int rf_level, int q);
+
+void av1_rc_update_framerate(struct AV1_COMP *cpi, int width, int height);
+
+void av1_rc_set_gf_interval_range(const struct AV1_COMP *const cpi,
+ RATE_CONTROL *const rc);
+
+void av1_set_target_rate(struct AV1_COMP *cpi, int width, int height);
+
+int av1_resize_one_pass_cbr(struct AV1_COMP *cpi);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_ENCODER_RATECTRL_H_