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Diffstat (limited to 'third_party/aom/av1/encoder/ratectrl.h')
| -rw-r--r-- | third_party/aom/av1/encoder/ratectrl.h | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/ratectrl.h b/third_party/aom/av1/encoder/ratectrl.h new file mode 100644 index 000000000..93a9b4939 --- /dev/null +++ b/third_party/aom/av1/encoder/ratectrl.h @@ -0,0 +1,284 @@ +/* + * 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 AV1_ENCODER_RATECTRL_H_ +#define 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 MIN_GF_INTERVAL 4 +#define MAX_GF_INTERVAL 16 +#define FIXED_GF_INTERVAL 8 // Used in some testing modes only + +#if CONFIG_EXT_REFS +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; +#else +typedef enum { + INTER_NORMAL = 0, + INTER_HIGH = 1, + GF_ARF_LOW = 2, + GF_ARF_STD = 3, + KF_STD = 4, + RATE_FACTOR_LEVELS = 5 +} RATE_FACTOR_LEVEL; +#endif // CONFIG_EXT_REFS + +// Internal frame scaling level. +typedef enum { + UNSCALED = 0, // Frame is unscaled. + SCALE_STEP1 = 1, // First-level down-scaling. + FRAME_SCALE_STEPS +} FRAME_SCALE_LEVEL; + +// 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; + +#if CONFIG_EXT_REFS + // 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; +#endif // CONFIG_EXT_REFS + + 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]; +} 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); + +// 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(const struct AV1_COMP *cpi, 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); + +// 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); + +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 av1_resize_one_pass_cbr(struct AV1_COMP *cpi); + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // AV1_ENCODER_RATECTRL_H_ |