1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef VP9_ENCODER_VP9_RATECTRL_H_ 12 #define VP9_ENCODER_VP9_RATECTRL_H_ 13 14 #include "vpx/vpx_codec.h" 15 #include "vpx/vpx_integer.h" 16 17 #include "vp9/common/vp9_blockd.h" 18 #include "vp9/encoder/vp9_lookahead.h" 19 20 #ifdef __cplusplus 21 extern "C" { 22 #endif 23 24 // Used to control aggressive VBR mode. 25 // #define AGGRESSIVE_VBR 1 26 27 // Bits Per MB at different Q (Multiplied by 512) 28 #define BPER_MB_NORMBITS 9 29 30 #define MIN_GF_INTERVAL 4 31 #define MAX_GF_INTERVAL 16 32 #define FIXED_GF_INTERVAL 8 // Used in some testing modes only 33 #define ONEHALFONLY_RESIZE 0 34 35 #define FRAME_OVERHEAD_BITS 200 36 37 typedef enum { 38 INTER_NORMAL = 0, 39 INTER_HIGH = 1, 40 GF_ARF_LOW = 2, 41 GF_ARF_STD = 3, 42 KF_STD = 4, 43 RATE_FACTOR_LEVELS = 5 44 } RATE_FACTOR_LEVEL; 45 46 // Internal frame scaling level. 47 typedef enum { 48 UNSCALED = 0, // Frame is unscaled. 49 SCALE_STEP1 = 1, // First-level down-scaling. 50 FRAME_SCALE_STEPS 51 } FRAME_SCALE_LEVEL; 52 53 typedef enum { 54 NO_RESIZE = 0, 55 DOWN_THREEFOUR = 1, // From orig to 3/4. 56 DOWN_ONEHALF = 2, // From orig or 3/4 to 1/2. 57 UP_THREEFOUR = -1, // From 1/2 to 3/4. 58 UP_ORIG = -2, // From 1/2 or 3/4 to orig. 59 } RESIZE_ACTION; 60 61 typedef enum { ORIG = 0, THREE_QUARTER = 1, ONE_HALF = 2 } RESIZE_STATE; 62 63 // Frame dimensions multiplier wrt the native frame size, in 1/16ths, 64 // specified for the scale-up case. 65 // e.g. 24 => 16/24 = 2/3 of native size. The restriction to 1/16th is 66 // intended to match the capabilities of the normative scaling filters, 67 // giving precedence to the up-scaling accuracy. 68 static const int frame_scale_factor[FRAME_SCALE_STEPS] = { 16, 24 }; 69 70 // Multiplier of the target rate to be used as threshold for triggering scaling. 71 static const double rate_thresh_mult[FRAME_SCALE_STEPS] = { 1.0, 2.0 }; 72 73 // Scale dependent Rate Correction Factor multipliers. Compensates for the 74 // greater number of bits per pixel generated in down-scaled frames. 75 static const double rcf_mult[FRAME_SCALE_STEPS] = { 1.0, 2.0 }; 76 77 typedef struct { 78 // Rate targetting variables 79 int base_frame_target; // A baseline frame target before adjustment 80 // for previous under or over shoot. 81 int this_frame_target; // Actual frame target after rc adjustment. 82 int projected_frame_size; 83 int sb64_target_rate; 84 int last_q[FRAME_TYPES]; // Separate values for Intra/Inter 85 int last_boosted_qindex; // Last boosted GF/KF/ARF q 86 int last_kf_qindex; // Q index of the last key frame coded. 87 88 int gfu_boost; 89 int last_boost; 90 int kf_boost; 91 92 double rate_correction_factors[RATE_FACTOR_LEVELS]; 93 94 int frames_since_golden; 95 int frames_till_gf_update_due; 96 int min_gf_interval; 97 int max_gf_interval; 98 int static_scene_max_gf_interval; 99 int baseline_gf_interval; 100 int constrained_gf_group; 101 int frames_to_key; 102 int frames_since_key; 103 int this_key_frame_forced; 104 int next_key_frame_forced; 105 int source_alt_ref_pending; 106 int source_alt_ref_active; 107 int is_src_frame_alt_ref; 108 109 int avg_frame_bandwidth; // Average frame size target for clip 110 int min_frame_bandwidth; // Minimum allocation used for any frame 111 int max_frame_bandwidth; // Maximum burst rate allowed for a frame. 112 113 int ni_av_qi; 114 int ni_tot_qi; 115 int ni_frames; 116 int avg_frame_qindex[FRAME_TYPES]; 117 double tot_q; 118 double avg_q; 119 120 int64_t buffer_level; 121 int64_t bits_off_target; 122 int64_t vbr_bits_off_target; 123 int64_t vbr_bits_off_target_fast; 124 125 int decimation_factor; 126 int decimation_count; 127 128 int rolling_target_bits; 129 int rolling_actual_bits; 130 131 int long_rolling_target_bits; 132 int long_rolling_actual_bits; 133 134 int rate_error_estimate; 135 136 int64_t total_actual_bits; 137 int64_t total_target_bits; 138 int64_t total_target_vs_actual; 139 140 int worst_quality; 141 int best_quality; 142 143 int64_t starting_buffer_level; 144 int64_t optimal_buffer_level; 145 int64_t maximum_buffer_size; 146 147 // rate control history for last frame(1) and the frame before(2). 148 // -1: undershot 149 // 1: overshoot 150 // 0: not initialized. 151 int rc_1_frame; 152 int rc_2_frame; 153 int q_1_frame; 154 int q_2_frame; 155 // Keep track of the last target average frame bandwidth. 156 int last_avg_frame_bandwidth; 157 158 // Auto frame-scaling variables. 159 FRAME_SCALE_LEVEL frame_size_selector; 160 FRAME_SCALE_LEVEL next_frame_size_selector; 161 int frame_width[FRAME_SCALE_STEPS]; 162 int frame_height[FRAME_SCALE_STEPS]; 163 int rf_level_maxq[RATE_FACTOR_LEVELS]; 164 165 int fac_active_worst_inter; 166 int fac_active_worst_gf; 167 uint64_t avg_source_sad[MAX_LAG_BUFFERS]; 168 uint64_t prev_avg_source_sad_lag; 169 int high_source_sad_lagindex; 170 int alt_ref_gf_group; 171 int last_frame_is_src_altref; 172 int high_source_sad; 173 int count_last_scene_change; 174 int avg_frame_low_motion; 175 int af_ratio_onepass_vbr; 176 int force_qpmin; 177 int reset_high_source_sad; 178 double perc_arf_usage; 179 } RATE_CONTROL; 180 181 struct VP9_COMP; 182 struct VP9EncoderConfig; 183 184 void vp9_rc_init(const struct VP9EncoderConfig *oxcf, int pass, 185 RATE_CONTROL *rc); 186 187 int vp9_estimate_bits_at_q(FRAME_TYPE frame_kind, int q, int mbs, 188 double correction_factor, vpx_bit_depth_t bit_depth); 189 190 double vp9_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth); 191 192 int vp9_convert_q_to_qindex(double q_val, vpx_bit_depth_t bit_depth); 193 194 void vp9_rc_init_minq_luts(void); 195 196 int vp9_rc_get_default_min_gf_interval(int width, int height, double framerate); 197 // Note vp9_rc_get_default_max_gf_interval() requires the min_gf_interval to 198 // be passed in to ensure that the max_gf_interval returned is at least as bis 199 // as that. 200 int vp9_rc_get_default_max_gf_interval(double framerate, int min_frame_rate); 201 202 // Generally at the high level, the following flow is expected 203 // to be enforced for rate control: 204 // First call per frame, one of: 205 // vp9_rc_get_one_pass_vbr_params() 206 // vp9_rc_get_one_pass_cbr_params() 207 // vp9_rc_get_svc_params() 208 // vp9_rc_get_first_pass_params() 209 // vp9_rc_get_second_pass_params() 210 // depending on the usage to set the rate control encode parameters desired. 211 // 212 // Then, call encode_frame_to_data_rate() to perform the 213 // actual encode. This function will in turn call encode_frame() 214 // one or more times, followed by one of: 215 // vp9_rc_postencode_update() 216 // vp9_rc_postencode_update_drop_frame() 217 // 218 // The majority of rate control parameters are only expected 219 // to be set in the vp9_rc_get_..._params() functions and 220 // updated during the vp9_rc_postencode_update...() functions. 221 // The only exceptions are vp9_rc_drop_frame() and 222 // vp9_rc_update_rate_correction_factors() functions. 223 224 // Functions to set parameters for encoding before the actual 225 // encode_frame_to_data_rate() function. 226 void vp9_rc_get_one_pass_vbr_params(struct VP9_COMP *cpi); 227 void vp9_rc_get_one_pass_cbr_params(struct VP9_COMP *cpi); 228 void vp9_rc_get_svc_params(struct VP9_COMP *cpi); 229 230 // Post encode update of the rate control parameters based 231 // on bytes used 232 void vp9_rc_postencode_update(struct VP9_COMP *cpi, uint64_t bytes_used); 233 // Post encode update of the rate control parameters for dropped frames 234 void vp9_rc_postencode_update_drop_frame(struct VP9_COMP *cpi); 235 236 // Updates rate correction factors 237 // Changes only the rate correction factors in the rate control structure. 238 void vp9_rc_update_rate_correction_factors(struct VP9_COMP *cpi); 239 240 // Decide if we should drop this frame: For 1-pass CBR. 241 // Changes only the decimation count in the rate control structure 242 int vp9_rc_drop_frame(struct VP9_COMP *cpi); 243 244 // Computes frame size bounds. 245 void vp9_rc_compute_frame_size_bounds(const struct VP9_COMP *cpi, 246 int this_frame_target, 247 int *frame_under_shoot_limit, 248 int *frame_over_shoot_limit); 249 250 // Picks q and q bounds given the target for bits 251 int vp9_rc_pick_q_and_bounds(const struct VP9_COMP *cpi, int *bottom_index, 252 int *top_index); 253 254 // Estimates q to achieve a target bits per frame 255 int vp9_rc_regulate_q(const struct VP9_COMP *cpi, int target_bits_per_frame, 256 int active_best_quality, int active_worst_quality); 257 258 // Estimates bits per mb for a given qindex and correction factor. 259 int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex, 260 double correction_factor, vpx_bit_depth_t bit_depth); 261 262 // Clamping utilities for bitrate targets for iframes and pframes. 263 int vp9_rc_clamp_iframe_target_size(const struct VP9_COMP *const cpi, 264 int target); 265 int vp9_rc_clamp_pframe_target_size(const struct VP9_COMP *const cpi, 266 int target); 267 // Utility to set frame_target into the RATE_CONTROL structure 268 // This function is called only from the vp9_rc_get_..._params() functions. 269 void vp9_rc_set_frame_target(struct VP9_COMP *cpi, int target); 270 271 // Computes a q delta (in "q index" terms) to get from a starting q value 272 // to a target q value 273 int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, 274 vpx_bit_depth_t bit_depth); 275 276 // Computes a q delta (in "q index" terms) to get from a starting q value 277 // to a value that should equate to the given rate ratio. 278 int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type, 279 int qindex, double rate_target_ratio, 280 vpx_bit_depth_t bit_depth); 281 282 int vp9_frame_type_qdelta(const struct VP9_COMP *cpi, int rf_level, int q); 283 284 void vp9_rc_update_framerate(struct VP9_COMP *cpi); 285 286 void vp9_rc_set_gf_interval_range(const struct VP9_COMP *const cpi, 287 RATE_CONTROL *const rc); 288 289 void vp9_set_target_rate(struct VP9_COMP *cpi); 290 291 int vp9_resize_one_pass_cbr(struct VP9_COMP *cpi); 292 293 void vp9_scene_detection_onepass(struct VP9_COMP *cpi); 294 295 int vp9_encodedframe_overshoot(struct VP9_COMP *cpi, int frame_size, int *q); 296 297 #ifdef __cplusplus 298 } // extern "C" 299 #endif 300 301 #endif // VP9_ENCODER_VP9_RATECTRL_H_ 302
