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 VPX_VP9_ENCODER_VP9_RATECTRL_H_ 12 #define VPX_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 // Threshold used to define a KF group as static (e.g. a slide show). 38 // Essentially this means that no frame in the group has more than 1% of MBs 39 // that are not marked as coded with 0,0 motion in the first pass. 40 #define STATIC_KF_GROUP_THRESH 99 41 42 // The maximum duration of a GF group that is static (for example a slide show). 43 #define MAX_STATIC_GF_GROUP_LENGTH 250 44 45 typedef enum { 46 INTER_NORMAL = 0, 47 INTER_HIGH = 1, 48 GF_ARF_LOW = 2, 49 GF_ARF_STD = 3, 50 KF_STD = 4, 51 RATE_FACTOR_LEVELS = 5 52 } RATE_FACTOR_LEVEL; 53 54 // Internal frame scaling level. 55 typedef enum { 56 UNSCALED = 0, // Frame is unscaled. 57 SCALE_STEP1 = 1, // First-level down-scaling. 58 FRAME_SCALE_STEPS 59 } FRAME_SCALE_LEVEL; 60 61 typedef enum { 62 NO_RESIZE = 0, 63 DOWN_THREEFOUR = 1, // From orig to 3/4. 64 DOWN_ONEHALF = 2, // From orig or 3/4 to 1/2. 65 UP_THREEFOUR = -1, // From 1/2 to 3/4. 66 UP_ORIG = -2, // From 1/2 or 3/4 to orig. 67 } RESIZE_ACTION; 68 69 typedef enum { ORIG = 0, THREE_QUARTER = 1, ONE_HALF = 2 } RESIZE_STATE; 70 71 // Frame dimensions multiplier wrt the native frame size, in 1/16ths, 72 // specified for the scale-up case. 73 // e.g. 24 => 16/24 = 2/3 of native size. The restriction to 1/16th is 74 // intended to match the capabilities of the normative scaling filters, 75 // giving precedence to the up-scaling accuracy. 76 static const int frame_scale_factor[FRAME_SCALE_STEPS] = { 16, 24 }; 77 78 // Multiplier of the target rate to be used as threshold for triggering scaling. 79 static const double rate_thresh_mult[FRAME_SCALE_STEPS] = { 1.0, 2.0 }; 80 81 // Scale dependent Rate Correction Factor multipliers. Compensates for the 82 // greater number of bits per pixel generated in down-scaled frames. 83 static const double rcf_mult[FRAME_SCALE_STEPS] = { 1.0, 2.0 }; 84 85 typedef struct { 86 // Rate targetting variables 87 int base_frame_target; // A baseline frame target before adjustment 88 // for previous under or over shoot. 89 int this_frame_target; // Actual frame target after rc adjustment. 90 int projected_frame_size; 91 int sb64_target_rate; 92 int last_q[FRAME_TYPES]; // Separate values for Intra/Inter 93 int last_boosted_qindex; // Last boosted GF/KF/ARF q 94 int last_kf_qindex; // Q index of the last key frame coded. 95 96 int gfu_boost; 97 int last_boost; 98 int kf_boost; 99 100 double rate_correction_factors[RATE_FACTOR_LEVELS]; 101 102 int frames_since_golden; 103 int frames_till_gf_update_due; 104 int min_gf_interval; 105 int max_gf_interval; 106 int static_scene_max_gf_interval; 107 int baseline_gf_interval; 108 int constrained_gf_group; 109 int frames_to_key; 110 int frames_since_key; 111 int this_key_frame_forced; 112 int next_key_frame_forced; 113 int source_alt_ref_pending; 114 int source_alt_ref_active; 115 int is_src_frame_alt_ref; 116 117 int avg_frame_bandwidth; // Average frame size target for clip 118 int min_frame_bandwidth; // Minimum allocation used for any frame 119 int max_frame_bandwidth; // Maximum burst rate allowed for a frame. 120 121 int ni_av_qi; 122 int ni_tot_qi; 123 int ni_frames; 124 int avg_frame_qindex[FRAME_TYPES]; 125 double tot_q; 126 double avg_q; 127 128 int64_t buffer_level; 129 int64_t bits_off_target; 130 int64_t vbr_bits_off_target; 131 int64_t vbr_bits_off_target_fast; 132 133 int decimation_factor; 134 int decimation_count; 135 136 int rolling_target_bits; 137 int rolling_actual_bits; 138 139 int long_rolling_target_bits; 140 int long_rolling_actual_bits; 141 142 int rate_error_estimate; 143 144 int64_t total_actual_bits; 145 int64_t total_target_bits; 146 int64_t total_target_vs_actual; 147 148 int worst_quality; 149 int best_quality; 150 151 int64_t starting_buffer_level; 152 int64_t optimal_buffer_level; 153 int64_t maximum_buffer_size; 154 155 // rate control history for last frame(1) and the frame before(2). 156 // -1: undershot 157 // 1: overshoot 158 // 0: not initialized. 159 int rc_1_frame; 160 int rc_2_frame; 161 int q_1_frame; 162 int q_2_frame; 163 // Keep track of the last target average frame bandwidth. 164 int last_avg_frame_bandwidth; 165 166 // Auto frame-scaling variables. 167 FRAME_SCALE_LEVEL frame_size_selector; 168 FRAME_SCALE_LEVEL next_frame_size_selector; 169 int frame_width[FRAME_SCALE_STEPS]; 170 int frame_height[FRAME_SCALE_STEPS]; 171 int rf_level_maxq[RATE_FACTOR_LEVELS]; 172 173 int fac_active_worst_inter; 174 int fac_active_worst_gf; 175 uint64_t avg_source_sad[MAX_LAG_BUFFERS]; 176 uint64_t prev_avg_source_sad_lag; 177 int high_source_sad_lagindex; 178 int high_num_blocks_with_motion; 179 int alt_ref_gf_group; 180 int last_frame_is_src_altref; 181 int high_source_sad; 182 int count_last_scene_change; 183 int hybrid_intra_scene_change; 184 int re_encode_maxq_scene_change; 185 int avg_frame_low_motion; 186 int af_ratio_onepass_vbr; 187 int force_qpmin; 188 int reset_high_source_sad; 189 double perc_arf_usage; 190 int force_max_q; 191 // Last frame was dropped post encode on scene change. 192 int last_post_encode_dropped_scene_change; 193 // Enable post encode frame dropping for screen content. Only enabled when 194 // ext_use_post_encode_drop is enabled by user. 195 int use_post_encode_drop; 196 // External flag to enable post encode frame dropping, controlled by user. 197 int ext_use_post_encode_drop; 198 199 int damped_adjustment[RATE_FACTOR_LEVELS]; 200 } RATE_CONTROL; 201 202 struct VP9_COMP; 203 struct VP9EncoderConfig; 204 205 void vp9_rc_init(const struct VP9EncoderConfig *oxcf, int pass, 206 RATE_CONTROL *rc); 207 208 int vp9_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs, 209 double correction_factor, vpx_bit_depth_t bit_depth); 210 211 double vp9_convert_qindex_to_q(int qindex, vpx_bit_depth_t bit_depth); 212 213 int vp9_convert_q_to_qindex(double q_val, vpx_bit_depth_t bit_depth); 214 215 void vp9_rc_init_minq_luts(void); 216 217 int vp9_rc_get_default_min_gf_interval(int width, int height, double framerate); 218 // Note vp9_rc_get_default_max_gf_interval() requires the min_gf_interval to 219 // be passed in to ensure that the max_gf_interval returned is at least as big 220 // as that. 221 int vp9_rc_get_default_max_gf_interval(double framerate, int min_gf_interval); 222 223 // Generally at the high level, the following flow is expected 224 // to be enforced for rate control: 225 // First call per frame, one of: 226 // vp9_rc_get_one_pass_vbr_params() 227 // vp9_rc_get_one_pass_cbr_params() 228 // vp9_rc_get_svc_params() 229 // vp9_rc_get_first_pass_params() 230 // vp9_rc_get_second_pass_params() 231 // depending on the usage to set the rate control encode parameters desired. 232 // 233 // Then, call encode_frame_to_data_rate() to perform the 234 // actual encode. This function will in turn call encode_frame() 235 // one or more times, followed by one of: 236 // vp9_rc_postencode_update() 237 // vp9_rc_postencode_update_drop_frame() 238 // 239 // The majority of rate control parameters are only expected 240 // to be set in the vp9_rc_get_..._params() functions and 241 // updated during the vp9_rc_postencode_update...() functions. 242 // The only exceptions are vp9_rc_drop_frame() and 243 // vp9_rc_update_rate_correction_factors() functions. 244 245 // Functions to set parameters for encoding before the actual 246 // encode_frame_to_data_rate() function. 247 void vp9_rc_get_one_pass_vbr_params(struct VP9_COMP *cpi); 248 void vp9_rc_get_one_pass_cbr_params(struct VP9_COMP *cpi); 249 void vp9_rc_get_svc_params(struct VP9_COMP *cpi); 250 251 // Post encode update of the rate control parameters based 252 // on bytes used 253 void vp9_rc_postencode_update(struct VP9_COMP *cpi, uint64_t bytes_used); 254 // Post encode update of the rate control parameters for dropped frames 255 void vp9_rc_postencode_update_drop_frame(struct VP9_COMP *cpi); 256 257 // Updates rate correction factors 258 // Changes only the rate correction factors in the rate control structure. 259 void vp9_rc_update_rate_correction_factors(struct VP9_COMP *cpi); 260 261 // Post encode drop for CBR mode. 262 int post_encode_drop_cbr(struct VP9_COMP *cpi, size_t *size); 263 264 // Decide if we should drop this frame: For 1-pass CBR. 265 // Changes only the decimation count in the rate control structure 266 int vp9_rc_drop_frame(struct VP9_COMP *cpi); 267 268 // Computes frame size bounds. 269 void vp9_rc_compute_frame_size_bounds(const struct VP9_COMP *cpi, 270 int frame_target, 271 int *frame_under_shoot_limit, 272 int *frame_over_shoot_limit); 273 274 // Picks q and q bounds given the target for bits 275 int vp9_rc_pick_q_and_bounds(const struct VP9_COMP *cpi, int *bottom_index, 276 int *top_index); 277 278 // Estimates q to achieve a target bits per frame 279 int vp9_rc_regulate_q(const struct VP9_COMP *cpi, int target_bits_per_frame, 280 int active_best_quality, int active_worst_quality); 281 282 // Estimates bits per mb for a given qindex and correction factor. 283 int vp9_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex, 284 double correction_factor, vpx_bit_depth_t bit_depth); 285 286 // Clamping utilities for bitrate targets for iframes and pframes. 287 int vp9_rc_clamp_iframe_target_size(const struct VP9_COMP *const cpi, 288 int target); 289 int vp9_rc_clamp_pframe_target_size(const struct VP9_COMP *const cpi, 290 int target); 291 // Utility to set frame_target into the RATE_CONTROL structure 292 // This function is called only from the vp9_rc_get_..._params() functions. 293 void vp9_rc_set_frame_target(struct VP9_COMP *cpi, int target); 294 295 // Computes a q delta (in "q index" terms) to get from a starting q value 296 // to a target q value 297 int vp9_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, 298 vpx_bit_depth_t bit_depth); 299 300 // Computes a q delta (in "q index" terms) to get from a starting q value 301 // to a value that should equate to the given rate ratio. 302 int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type, 303 int qindex, double rate_target_ratio, 304 vpx_bit_depth_t bit_depth); 305 306 int vp9_frame_type_qdelta(const struct VP9_COMP *cpi, int rf_level, int q); 307 308 void vp9_rc_update_framerate(struct VP9_COMP *cpi); 309 310 void vp9_rc_set_gf_interval_range(const struct VP9_COMP *const cpi, 311 RATE_CONTROL *const rc); 312 313 void vp9_set_target_rate(struct VP9_COMP *cpi); 314 315 int vp9_resize_one_pass_cbr(struct VP9_COMP *cpi); 316 317 void vp9_scene_detection_onepass(struct VP9_COMP *cpi); 318 319 int vp9_encodedframe_overshoot(struct VP9_COMP *cpi, int frame_size, int *q); 320 321 void vp9_configure_buffer_updates(struct VP9_COMP *cpi, int gf_group_index); 322 323 void vp9_estimate_qp_gop(struct VP9_COMP *cpi); 324 325 #ifdef __cplusplus 326 } // extern "C" 327 #endif 328 329 #endif // VPX_VP9_ENCODER_VP9_RATECTRL_H_ 330