1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #include <assert.h> 13 #include <limits.h> 14 #include <math.h> 15 #include <stdio.h> 16 #include <stdlib.h> 17 #include <string.h> 18 19 #include "aom_dsp/aom_dsp_common.h" 20 #include "aom_mem/aom_mem.h" 21 #include "aom_ports/mem.h" 22 #include "aom_ports/system_state.h" 23 24 #include "av1/common/alloccommon.h" 25 #include "av1/encoder/aq_cyclicrefresh.h" 26 #include "av1/common/common.h" 27 #include "av1/common/entropymode.h" 28 #include "av1/common/quant_common.h" 29 #include "av1/common/seg_common.h" 30 31 #include "av1/encoder/encodemv.h" 32 #include "av1/encoder/encode_strategy.h" 33 #include "av1/encoder/gop_structure.h" 34 #include "av1/encoder/random.h" 35 #include "av1/encoder/ratectrl.h" 36 37 // Max rate target for 1080P and below encodes under normal circumstances 38 // (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB 39 #define MAX_MB_RATE 250 40 #define MAXRATE_1080P 2025000 41 42 #define DEFAULT_KF_BOOST 2000 43 #define DEFAULT_GF_BOOST 2000 44 45 #define MIN_BPB_FACTOR 0.005 46 #define MAX_BPB_FACTOR 50 47 48 #define FRAME_OVERHEAD_BITS 200 49 #define ASSIGN_MINQ_TABLE(bit_depth, name) \ 50 do { \ 51 switch (bit_depth) { \ 52 case AOM_BITS_8: name = name##_8; break; \ 53 case AOM_BITS_10: name = name##_10; break; \ 54 case AOM_BITS_12: name = name##_12; break; \ 55 default: \ 56 assert(0 && \ 57 "bit_depth should be AOM_BITS_8, AOM_BITS_10" \ 58 " or AOM_BITS_12"); \ 59 name = NULL; \ 60 } \ 61 } while (0) 62 63 // Tables relating active max Q to active min Q 64 static int kf_low_motion_minq_8[QINDEX_RANGE]; 65 static int kf_high_motion_minq_8[QINDEX_RANGE]; 66 static int arfgf_low_motion_minq_8[QINDEX_RANGE]; 67 static int arfgf_high_motion_minq_8[QINDEX_RANGE]; 68 static int inter_minq_8[QINDEX_RANGE]; 69 static int rtc_minq_8[QINDEX_RANGE]; 70 71 static int kf_low_motion_minq_10[QINDEX_RANGE]; 72 static int kf_high_motion_minq_10[QINDEX_RANGE]; 73 static int arfgf_low_motion_minq_10[QINDEX_RANGE]; 74 static int arfgf_high_motion_minq_10[QINDEX_RANGE]; 75 static int inter_minq_10[QINDEX_RANGE]; 76 static int rtc_minq_10[QINDEX_RANGE]; 77 static int kf_low_motion_minq_12[QINDEX_RANGE]; 78 static int kf_high_motion_minq_12[QINDEX_RANGE]; 79 static int arfgf_low_motion_minq_12[QINDEX_RANGE]; 80 static int arfgf_high_motion_minq_12[QINDEX_RANGE]; 81 static int inter_minq_12[QINDEX_RANGE]; 82 static int rtc_minq_12[QINDEX_RANGE]; 83 84 static int gf_high = 2000; 85 static int gf_low = 400; 86 static int kf_high = 5000; 87 static int kf_low = 400; 88 89 // How many times less pixels there are to encode given the current scaling. 90 // Temporary replacement for rcf_mult and rate_thresh_mult. 91 static double resize_rate_factor(const AV1_COMP *cpi, int width, int height) { 92 return (double)(cpi->oxcf.width * cpi->oxcf.height) / (width * height); 93 } 94 95 // Functions to compute the active minq lookup table entries based on a 96 // formulaic approach to facilitate easier adjustment of the Q tables. 97 // The formulae were derived from computing a 3rd order polynomial best 98 // fit to the original data (after plotting real maxq vs minq (not q index)) 99 static int get_minq_index(double maxq, double x3, double x2, double x1, 100 aom_bit_depth_t bit_depth) { 101 const double minqtarget = AOMMIN(((x3 * maxq + x2) * maxq + x1) * maxq, maxq); 102 103 // Special case handling to deal with the step from q2.0 104 // down to lossless mode represented by q 1.0. 105 if (minqtarget <= 2.0) return 0; 106 107 return av1_find_qindex(minqtarget, bit_depth, 0, QINDEX_RANGE - 1); 108 } 109 110 static void init_minq_luts(int *kf_low_m, int *kf_high_m, int *arfgf_low, 111 int *arfgf_high, int *inter, int *rtc, 112 aom_bit_depth_t bit_depth) { 113 int i; 114 for (i = 0; i < QINDEX_RANGE; i++) { 115 const double maxq = av1_convert_qindex_to_q(i, bit_depth); 116 kf_low_m[i] = get_minq_index(maxq, 0.000001, -0.0004, 0.150, bit_depth); 117 kf_high_m[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.45, bit_depth); 118 arfgf_low[i] = get_minq_index(maxq, 0.0000015, -0.0009, 0.30, bit_depth); 119 arfgf_high[i] = get_minq_index(maxq, 0.0000021, -0.00125, 0.55, bit_depth); 120 inter[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.90, bit_depth); 121 rtc[i] = get_minq_index(maxq, 0.00000271, -0.00113, 0.70, bit_depth); 122 } 123 } 124 125 void av1_rc_init_minq_luts(void) { 126 init_minq_luts(kf_low_motion_minq_8, kf_high_motion_minq_8, 127 arfgf_low_motion_minq_8, arfgf_high_motion_minq_8, 128 inter_minq_8, rtc_minq_8, AOM_BITS_8); 129 init_minq_luts(kf_low_motion_minq_10, kf_high_motion_minq_10, 130 arfgf_low_motion_minq_10, arfgf_high_motion_minq_10, 131 inter_minq_10, rtc_minq_10, AOM_BITS_10); 132 init_minq_luts(kf_low_motion_minq_12, kf_high_motion_minq_12, 133 arfgf_low_motion_minq_12, arfgf_high_motion_minq_12, 134 inter_minq_12, rtc_minq_12, AOM_BITS_12); 135 } 136 137 // These functions use formulaic calculations to make playing with the 138 // quantizer tables easier. If necessary they can be replaced by lookup 139 // tables if and when things settle down in the experimental bitstream 140 double av1_convert_qindex_to_q(int qindex, aom_bit_depth_t bit_depth) { 141 // Convert the index to a real Q value (scaled down to match old Q values) 142 switch (bit_depth) { 143 case AOM_BITS_8: return av1_ac_quant_Q3(qindex, 0, bit_depth) / 4.0; 144 case AOM_BITS_10: return av1_ac_quant_Q3(qindex, 0, bit_depth) / 16.0; 145 case AOM_BITS_12: return av1_ac_quant_Q3(qindex, 0, bit_depth) / 64.0; 146 default: 147 assert(0 && "bit_depth should be AOM_BITS_8, AOM_BITS_10 or AOM_BITS_12"); 148 return -1.0; 149 } 150 } 151 152 int av1_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex, 153 double correction_factor, aom_bit_depth_t bit_depth) { 154 const double q = av1_convert_qindex_to_q(qindex, bit_depth); 155 int enumerator = frame_type == KEY_FRAME ? 2700000 : 1800000; 156 157 assert(correction_factor <= MAX_BPB_FACTOR && 158 correction_factor >= MIN_BPB_FACTOR); 159 160 // q based adjustment to baseline enumerator 161 enumerator += (int)(enumerator * q) >> 12; 162 return (int)(enumerator * correction_factor / q); 163 } 164 165 int av1_estimate_bits_at_q(FRAME_TYPE frame_type, int q, int mbs, 166 double correction_factor, 167 aom_bit_depth_t bit_depth) { 168 const int bpm = 169 (int)(av1_rc_bits_per_mb(frame_type, q, correction_factor, bit_depth)); 170 return AOMMAX(FRAME_OVERHEAD_BITS, 171 (int)((uint64_t)bpm * mbs) >> BPER_MB_NORMBITS); 172 } 173 174 int av1_rc_clamp_pframe_target_size(const AV1_COMP *const cpi, int target, 175 FRAME_UPDATE_TYPE frame_update_type) { 176 const RATE_CONTROL *rc = &cpi->rc; 177 const AV1EncoderConfig *oxcf = &cpi->oxcf; 178 const int min_frame_target = 179 AOMMAX(rc->min_frame_bandwidth, rc->avg_frame_bandwidth >> 5); 180 // Clip the frame target to the minimum setup value. 181 if (frame_update_type == OVERLAY_UPDATE || 182 frame_update_type == INTNL_OVERLAY_UPDATE) { 183 // If there is an active ARF at this location use the minimum 184 // bits on this frame even if it is a constructed arf. 185 // The active maximum quantizer insures that an appropriate 186 // number of bits will be spent if needed for constructed ARFs. 187 target = min_frame_target; 188 } else if (target < min_frame_target) { 189 target = min_frame_target; 190 } 191 192 // Clip the frame target to the maximum allowed value. 193 if (target > rc->max_frame_bandwidth) target = rc->max_frame_bandwidth; 194 if (oxcf->rc_max_inter_bitrate_pct) { 195 const int max_rate = 196 rc->avg_frame_bandwidth * oxcf->rc_max_inter_bitrate_pct / 100; 197 target = AOMMIN(target, max_rate); 198 } 199 200 return target; 201 } 202 203 int av1_rc_clamp_iframe_target_size(const AV1_COMP *const cpi, int target) { 204 const RATE_CONTROL *rc = &cpi->rc; 205 const AV1EncoderConfig *oxcf = &cpi->oxcf; 206 if (oxcf->rc_max_intra_bitrate_pct) { 207 const int max_rate = 208 rc->avg_frame_bandwidth * oxcf->rc_max_intra_bitrate_pct / 100; 209 target = AOMMIN(target, max_rate); 210 } 211 if (target > rc->max_frame_bandwidth) target = rc->max_frame_bandwidth; 212 return target; 213 } 214 215 // Update the buffer level: leaky bucket model. 216 static void update_buffer_level(AV1_COMP *cpi, int encoded_frame_size) { 217 const AV1_COMMON *const cm = &cpi->common; 218 RATE_CONTROL *const rc = &cpi->rc; 219 220 // Non-viewable frames are a special case and are treated as pure overhead. 221 if (!cm->show_frame) 222 rc->bits_off_target -= encoded_frame_size; 223 else 224 rc->bits_off_target += rc->avg_frame_bandwidth - encoded_frame_size; 225 226 // Clip the buffer level to the maximum specified buffer size. 227 rc->bits_off_target = AOMMIN(rc->bits_off_target, rc->maximum_buffer_size); 228 rc->buffer_level = rc->bits_off_target; 229 } 230 231 int av1_rc_get_default_min_gf_interval(int width, int height, 232 double framerate) { 233 // Assume we do not need any constraint lower than 4K 20 fps 234 static const double factor_safe = 3840 * 2160 * 20.0; 235 const double factor = width * height * framerate; 236 const int default_interval = 237 clamp((int)(framerate * 0.125), MIN_GF_INTERVAL, MAX_GF_INTERVAL); 238 239 if (factor <= factor_safe) 240 return default_interval; 241 else 242 return AOMMAX(default_interval, 243 (int)(MIN_GF_INTERVAL * factor / factor_safe + 0.5)); 244 // Note this logic makes: 245 // 4K24: 5 246 // 4K30: 6 247 // 4K60: 12 248 } 249 250 int av1_rc_get_default_max_gf_interval(double framerate, int min_gf_interval) { 251 int interval = AOMMIN(MAX_GF_INTERVAL, (int)(framerate * 0.75)); 252 interval += (interval & 0x01); // Round to even value 253 interval = AOMMAX(MAX_GF_INTERVAL, interval); 254 return AOMMAX(interval, min_gf_interval); 255 } 256 257 void av1_rc_init(const AV1EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) { 258 int i; 259 260 if (pass == 0 && oxcf->rc_mode == AOM_CBR) { 261 rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q; 262 rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q; 263 } else { 264 rc->avg_frame_qindex[KEY_FRAME] = 265 (oxcf->worst_allowed_q + oxcf->best_allowed_q) / 2; 266 rc->avg_frame_qindex[INTER_FRAME] = 267 (oxcf->worst_allowed_q + oxcf->best_allowed_q) / 2; 268 } 269 270 rc->last_q[KEY_FRAME] = oxcf->best_allowed_q; 271 rc->last_q[INTER_FRAME] = oxcf->worst_allowed_q; 272 273 rc->buffer_level = rc->starting_buffer_level; 274 rc->bits_off_target = rc->starting_buffer_level; 275 276 rc->rolling_target_bits = rc->avg_frame_bandwidth; 277 rc->rolling_actual_bits = rc->avg_frame_bandwidth; 278 rc->long_rolling_target_bits = rc->avg_frame_bandwidth; 279 rc->long_rolling_actual_bits = rc->avg_frame_bandwidth; 280 281 rc->total_actual_bits = 0; 282 rc->total_target_bits = 0; 283 rc->total_target_vs_actual = 0; 284 285 rc->frames_since_key = 8; // Sensible default for first frame. 286 rc->this_key_frame_forced = 0; 287 rc->next_key_frame_forced = 0; 288 rc->source_alt_ref_pending = 0; 289 rc->source_alt_ref_active = 0; 290 291 rc->frames_till_gf_update_due = 0; 292 rc->ni_av_qi = oxcf->worst_allowed_q; 293 rc->ni_tot_qi = 0; 294 rc->ni_frames = 0; 295 296 rc->tot_q = 0.0; 297 rc->avg_q = av1_convert_qindex_to_q(oxcf->worst_allowed_q, oxcf->bit_depth); 298 299 for (i = 0; i < RATE_FACTOR_LEVELS; ++i) { 300 rc->rate_correction_factors[i] = 0.7; 301 } 302 rc->rate_correction_factors[KF_STD] = 1.0; 303 rc->min_gf_interval = oxcf->min_gf_interval; 304 rc->max_gf_interval = oxcf->max_gf_interval; 305 if (rc->min_gf_interval == 0) 306 rc->min_gf_interval = av1_rc_get_default_min_gf_interval( 307 oxcf->width, oxcf->height, oxcf->init_framerate); 308 if (rc->max_gf_interval == 0) 309 rc->max_gf_interval = av1_rc_get_default_max_gf_interval( 310 oxcf->init_framerate, rc->min_gf_interval); 311 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2; 312 } 313 314 int av1_rc_drop_frame(AV1_COMP *cpi) { 315 const AV1EncoderConfig *oxcf = &cpi->oxcf; 316 RATE_CONTROL *const rc = &cpi->rc; 317 318 if (!oxcf->drop_frames_water_mark) { 319 return 0; 320 } else { 321 if (rc->buffer_level < 0) { 322 // Always drop if buffer is below 0. 323 return 1; 324 } else { 325 // If buffer is below drop_mark, for now just drop every other frame 326 // (starting with the next frame) until it increases back over drop_mark. 327 int drop_mark = 328 (int)(oxcf->drop_frames_water_mark * rc->optimal_buffer_level / 100); 329 if ((rc->buffer_level > drop_mark) && (rc->decimation_factor > 0)) { 330 --rc->decimation_factor; 331 } else if (rc->buffer_level <= drop_mark && rc->decimation_factor == 0) { 332 rc->decimation_factor = 1; 333 } 334 if (rc->decimation_factor > 0) { 335 if (rc->decimation_count > 0) { 336 --rc->decimation_count; 337 return 1; 338 } else { 339 rc->decimation_count = rc->decimation_factor; 340 return 0; 341 } 342 } else { 343 rc->decimation_count = 0; 344 return 0; 345 } 346 } 347 } 348 } 349 350 static const RATE_FACTOR_LEVEL rate_factor_levels[FRAME_UPDATE_TYPES] = { 351 KF_STD, // KF_UPDATE 352 INTER_NORMAL, // LF_UPDATE 353 GF_ARF_STD, // GF_UPDATE 354 GF_ARF_STD, // ARF_UPDATE 355 INTER_NORMAL, // OVERLAY_UPDATE 356 INTER_NORMAL, // INTNL_OVERLAY_UPDATE 357 GF_ARF_LOW, // INTNL_ARF_UPDATE 358 }; 359 360 static RATE_FACTOR_LEVEL get_rate_factor_level(const GF_GROUP *const gf_group) { 361 const FRAME_UPDATE_TYPE update_type = gf_group->update_type[gf_group->index]; 362 assert(update_type < FRAME_UPDATE_TYPES); 363 return rate_factor_levels[update_type]; 364 } 365 366 static double get_rate_correction_factor(const AV1_COMP *cpi, int width, 367 int height) { 368 const RATE_CONTROL *const rc = &cpi->rc; 369 double rcf; 370 371 if (cpi->common.current_frame.frame_type == KEY_FRAME) { 372 rcf = rc->rate_correction_factors[KF_STD]; 373 } else if (cpi->oxcf.pass == 2) { 374 const RATE_FACTOR_LEVEL rf_lvl = 375 get_rate_factor_level(&cpi->twopass.gf_group); 376 rcf = rc->rate_correction_factors[rf_lvl]; 377 } else { 378 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) && 379 !rc->is_src_frame_alt_ref && 380 (cpi->oxcf.rc_mode != AOM_CBR || cpi->oxcf.gf_cbr_boost_pct > 20)) 381 rcf = rc->rate_correction_factors[GF_ARF_STD]; 382 else 383 rcf = rc->rate_correction_factors[INTER_NORMAL]; 384 } 385 rcf *= resize_rate_factor(cpi, width, height); 386 return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR); 387 } 388 389 static void set_rate_correction_factor(AV1_COMP *cpi, double factor, int width, 390 int height) { 391 RATE_CONTROL *const rc = &cpi->rc; 392 393 // Normalize RCF to account for the size-dependent scaling factor. 394 factor /= resize_rate_factor(cpi, width, height); 395 396 factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR); 397 398 if (cpi->common.current_frame.frame_type == KEY_FRAME) { 399 rc->rate_correction_factors[KF_STD] = factor; 400 } else if (cpi->oxcf.pass == 2) { 401 const RATE_FACTOR_LEVEL rf_lvl = 402 get_rate_factor_level(&cpi->twopass.gf_group); 403 rc->rate_correction_factors[rf_lvl] = factor; 404 } else { 405 if ((cpi->refresh_alt_ref_frame || cpi->refresh_golden_frame) && 406 !rc->is_src_frame_alt_ref && 407 (cpi->oxcf.rc_mode != AOM_CBR || cpi->oxcf.gf_cbr_boost_pct > 20)) 408 rc->rate_correction_factors[GF_ARF_STD] = factor; 409 else 410 rc->rate_correction_factors[INTER_NORMAL] = factor; 411 } 412 } 413 414 void av1_rc_update_rate_correction_factors(AV1_COMP *cpi, int width, 415 int height) { 416 const AV1_COMMON *const cm = &cpi->common; 417 int correction_factor = 100; 418 double rate_correction_factor = 419 get_rate_correction_factor(cpi, width, height); 420 double adjustment_limit; 421 const int MBs = av1_get_MBs(width, height); 422 423 int projected_size_based_on_q = 0; 424 425 // Do not update the rate factors for arf overlay frames. 426 if (cpi->rc.is_src_frame_alt_ref) return; 427 428 // Clear down mmx registers to allow floating point in what follows 429 aom_clear_system_state(); 430 431 // Work out how big we would have expected the frame to be at this Q given 432 // the current correction factor. 433 // Stay in double to avoid int overflow when values are large 434 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled) { 435 projected_size_based_on_q = 436 av1_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor); 437 } else { 438 projected_size_based_on_q = av1_estimate_bits_at_q( 439 cpi->common.current_frame.frame_type, cm->base_qindex, MBs, 440 rate_correction_factor, cm->seq_params.bit_depth); 441 } 442 // Work out a size correction factor. 443 if (projected_size_based_on_q > FRAME_OVERHEAD_BITS) 444 correction_factor = (int)((100 * (int64_t)cpi->rc.projected_frame_size) / 445 projected_size_based_on_q); 446 447 // More heavily damped adjustment used if we have been oscillating either side 448 // of target. 449 if (correction_factor > 0) { 450 adjustment_limit = 451 0.25 + 0.5 * AOMMIN(1, fabs(log10(0.01 * correction_factor))); 452 } else { 453 adjustment_limit = 0.75; 454 } 455 456 cpi->rc.q_2_frame = cpi->rc.q_1_frame; 457 cpi->rc.q_1_frame = cm->base_qindex; 458 cpi->rc.rc_2_frame = cpi->rc.rc_1_frame; 459 if (correction_factor > 110) 460 cpi->rc.rc_1_frame = -1; 461 else if (correction_factor < 90) 462 cpi->rc.rc_1_frame = 1; 463 else 464 cpi->rc.rc_1_frame = 0; 465 466 if (correction_factor > 102) { 467 // We are not already at the worst allowable quality 468 correction_factor = 469 (int)(100 + ((correction_factor - 100) * adjustment_limit)); 470 rate_correction_factor = (rate_correction_factor * correction_factor) / 100; 471 // Keep rate_correction_factor within limits 472 if (rate_correction_factor > MAX_BPB_FACTOR) 473 rate_correction_factor = MAX_BPB_FACTOR; 474 } else if (correction_factor < 99) { 475 // We are not already at the best allowable quality 476 correction_factor = 477 (int)(100 - ((100 - correction_factor) * adjustment_limit)); 478 rate_correction_factor = (rate_correction_factor * correction_factor) / 100; 479 480 // Keep rate_correction_factor within limits 481 if (rate_correction_factor < MIN_BPB_FACTOR) 482 rate_correction_factor = MIN_BPB_FACTOR; 483 } 484 485 set_rate_correction_factor(cpi, rate_correction_factor, width, height); 486 } 487 488 // Calculate rate for the given 'q'. 489 static int get_bits_per_mb(const AV1_COMP *cpi, int use_cyclic_refresh, 490 double correction_factor, int q) { 491 const AV1_COMMON *const cm = &cpi->common; 492 return use_cyclic_refresh 493 ? av1_cyclic_refresh_rc_bits_per_mb(cpi, q, correction_factor) 494 : av1_rc_bits_per_mb(cm->current_frame.frame_type, q, 495 correction_factor, cm->seq_params.bit_depth); 496 } 497 498 // Similar to find_qindex_by_rate() function in ratectrl.c, but returns the q 499 // index with rate just above or below the desired rate, depending on which of 500 // the two rates is closer to the desired rate. 501 // Also, respects the selected aq_mode when computing the rate. 502 static int find_closest_qindex_by_rate(int desired_bits_per_mb, 503 const AV1_COMP *cpi, 504 double correction_factor, 505 int best_qindex, int worst_qindex) { 506 const int use_cyclic_refresh = 507 cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cpi->common.seg.enabled; 508 509 // Find 'qindex' based on 'desired_bits_per_mb'. 510 assert(best_qindex <= worst_qindex); 511 int low = best_qindex; 512 int high = worst_qindex; 513 while (low < high) { 514 const int mid = (low + high) >> 1; 515 const int mid_bits_per_mb = 516 get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, mid); 517 if (mid_bits_per_mb > desired_bits_per_mb) { 518 low = mid + 1; 519 } else { 520 high = mid; 521 } 522 } 523 assert(low == high); 524 525 // Calculate rate difference of this q index from the desired rate. 526 const int curr_q = low; 527 const int curr_bits_per_mb = 528 get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, curr_q); 529 const int curr_bit_diff = (curr_bits_per_mb <= desired_bits_per_mb) 530 ? desired_bits_per_mb - curr_bits_per_mb 531 : INT_MAX; 532 assert((curr_bit_diff != INT_MAX && curr_bit_diff >= 0) || 533 curr_q == worst_qindex); 534 535 // Calculate rate difference for previous q index too. 536 const int prev_q = curr_q - 1; 537 int prev_bit_diff; 538 if (curr_bit_diff == INT_MAX || curr_q == best_qindex) { 539 prev_bit_diff = INT_MAX; 540 } else { 541 const int prev_bits_per_mb = 542 get_bits_per_mb(cpi, use_cyclic_refresh, correction_factor, prev_q); 543 assert(prev_bits_per_mb > desired_bits_per_mb); 544 prev_bit_diff = prev_bits_per_mb - desired_bits_per_mb; 545 } 546 547 // Pick one of the two q indices, depending on which one has rate closer to 548 // the desired rate. 549 return (curr_bit_diff <= prev_bit_diff) ? curr_q : prev_q; 550 } 551 552 int av1_rc_regulate_q(const AV1_COMP *cpi, int target_bits_per_frame, 553 int active_best_quality, int active_worst_quality, 554 int width, int height) { 555 const int MBs = av1_get_MBs(width, height); 556 const double correction_factor = 557 get_rate_correction_factor(cpi, width, height); 558 const int target_bits_per_mb = 559 (int)((uint64_t)(target_bits_per_frame) << BPER_MB_NORMBITS) / MBs; 560 561 int q = 562 find_closest_qindex_by_rate(target_bits_per_mb, cpi, correction_factor, 563 active_best_quality, active_worst_quality); 564 565 // In CBR mode, this makes sure q is between oscillating Qs to prevent 566 // resonance. 567 if (cpi->oxcf.rc_mode == AOM_CBR && 568 (cpi->rc.rc_1_frame * cpi->rc.rc_2_frame == -1) && 569 cpi->rc.q_1_frame != cpi->rc.q_2_frame) { 570 q = clamp(q, AOMMIN(cpi->rc.q_1_frame, cpi->rc.q_2_frame), 571 AOMMAX(cpi->rc.q_1_frame, cpi->rc.q_2_frame)); 572 } 573 return q; 574 } 575 576 static int get_active_quality(int q, int gfu_boost, int low, int high, 577 int *low_motion_minq, int *high_motion_minq) { 578 if (gfu_boost > high) { 579 return low_motion_minq[q]; 580 } else if (gfu_boost < low) { 581 return high_motion_minq[q]; 582 } else { 583 const int gap = high - low; 584 const int offset = high - gfu_boost; 585 const int qdiff = high_motion_minq[q] - low_motion_minq[q]; 586 const int adjustment = ((offset * qdiff) + (gap >> 1)) / gap; 587 return low_motion_minq[q] + adjustment; 588 } 589 } 590 591 static int get_kf_active_quality(const RATE_CONTROL *const rc, int q, 592 aom_bit_depth_t bit_depth) { 593 int *kf_low_motion_minq; 594 int *kf_high_motion_minq; 595 ASSIGN_MINQ_TABLE(bit_depth, kf_low_motion_minq); 596 ASSIGN_MINQ_TABLE(bit_depth, kf_high_motion_minq); 597 return get_active_quality(q, rc->kf_boost, kf_low, kf_high, 598 kf_low_motion_minq, kf_high_motion_minq); 599 } 600 601 static int get_gf_active_quality(const RATE_CONTROL *const rc, int q, 602 aom_bit_depth_t bit_depth) { 603 int *arfgf_low_motion_minq; 604 int *arfgf_high_motion_minq; 605 ASSIGN_MINQ_TABLE(bit_depth, arfgf_low_motion_minq); 606 ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq); 607 return get_active_quality(q, rc->gfu_boost, gf_low, gf_high, 608 arfgf_low_motion_minq, arfgf_high_motion_minq); 609 } 610 611 static int get_gf_high_motion_quality(int q, aom_bit_depth_t bit_depth) { 612 int *arfgf_high_motion_minq; 613 ASSIGN_MINQ_TABLE(bit_depth, arfgf_high_motion_minq); 614 return arfgf_high_motion_minq[q]; 615 } 616 617 static int calc_active_worst_quality_one_pass_vbr(const AV1_COMP *cpi) { 618 const RATE_CONTROL *const rc = &cpi->rc; 619 const unsigned int curr_frame = cpi->common.current_frame.frame_number; 620 int active_worst_quality; 621 622 if (cpi->common.current_frame.frame_type == KEY_FRAME) { 623 active_worst_quality = 624 curr_frame == 0 ? rc->worst_quality : rc->last_q[KEY_FRAME] * 2; 625 } else { 626 if (!rc->is_src_frame_alt_ref && 627 (cpi->refresh_golden_frame || cpi->refresh_alt2_ref_frame || 628 cpi->refresh_alt_ref_frame)) { 629 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4 630 : rc->last_q[INTER_FRAME]; 631 } else { 632 active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 2 633 : rc->last_q[INTER_FRAME] * 2; 634 } 635 } 636 return AOMMIN(active_worst_quality, rc->worst_quality); 637 } 638 639 // Adjust active_worst_quality level based on buffer level. 640 static int calc_active_worst_quality_one_pass_cbr(const AV1_COMP *cpi) { 641 // Adjust active_worst_quality: If buffer is above the optimal/target level, 642 // bring active_worst_quality down depending on fullness of buffer. 643 // If buffer is below the optimal level, let the active_worst_quality go from 644 // ambient Q (at buffer = optimal level) to worst_quality level 645 // (at buffer = critical level). 646 const AV1_COMMON *const cm = &cpi->common; 647 const RATE_CONTROL *rc = &cpi->rc; 648 // Buffer level below which we push active_worst to worst_quality. 649 int64_t critical_level = rc->optimal_buffer_level >> 3; 650 int64_t buff_lvl_step = 0; 651 int adjustment = 0; 652 int active_worst_quality; 653 int ambient_qp; 654 if (cm->current_frame.frame_type == KEY_FRAME) return rc->worst_quality; 655 // For ambient_qp we use minimum of avg_frame_qindex[KEY_FRAME/INTER_FRAME] 656 // for the first few frames following key frame. These are both initialized 657 // to worst_quality and updated with (3/4, 1/4) average in postencode_update. 658 // So for first few frames following key, the qp of that key frame is weighted 659 // into the active_worst_quality setting. 660 ambient_qp = (cm->current_frame.frame_number < 5) 661 ? AOMMIN(rc->avg_frame_qindex[INTER_FRAME], 662 rc->avg_frame_qindex[KEY_FRAME]) 663 : rc->avg_frame_qindex[INTER_FRAME]; 664 active_worst_quality = AOMMIN(rc->worst_quality, ambient_qp * 5 / 4); 665 if (rc->buffer_level > rc->optimal_buffer_level) { 666 // Adjust down. 667 // Maximum limit for down adjustment, ~30%. 668 int max_adjustment_down = active_worst_quality / 3; 669 if (max_adjustment_down) { 670 buff_lvl_step = ((rc->maximum_buffer_size - rc->optimal_buffer_level) / 671 max_adjustment_down); 672 if (buff_lvl_step) 673 adjustment = (int)((rc->buffer_level - rc->optimal_buffer_level) / 674 buff_lvl_step); 675 active_worst_quality -= adjustment; 676 } 677 } else if (rc->buffer_level > critical_level) { 678 // Adjust up from ambient Q. 679 if (critical_level) { 680 buff_lvl_step = (rc->optimal_buffer_level - critical_level); 681 if (buff_lvl_step) { 682 adjustment = (int)((rc->worst_quality - ambient_qp) * 683 (rc->optimal_buffer_level - rc->buffer_level) / 684 buff_lvl_step); 685 } 686 active_worst_quality = ambient_qp + adjustment; 687 } 688 } else { 689 // Set to worst_quality if buffer is below critical level. 690 active_worst_quality = rc->worst_quality; 691 } 692 return active_worst_quality; 693 } 694 695 static int rc_pick_q_and_bounds_one_pass_cbr(const AV1_COMP *cpi, int width, 696 int height, int *bottom_index, 697 int *top_index) { 698 const AV1_COMMON *const cm = &cpi->common; 699 const RATE_CONTROL *const rc = &cpi->rc; 700 const CurrentFrame *const current_frame = &cm->current_frame; 701 int active_best_quality; 702 int active_worst_quality = calc_active_worst_quality_one_pass_cbr(cpi); 703 int q; 704 int *rtc_minq; 705 const int bit_depth = cm->seq_params.bit_depth; 706 ASSIGN_MINQ_TABLE(bit_depth, rtc_minq); 707 708 if (frame_is_intra_only(cm)) { 709 active_best_quality = rc->best_quality; 710 // Handle the special case for key frames forced when we have reached 711 // the maximum key frame interval. Here force the Q to a range 712 // based on the ambient Q to reduce the risk of popping. 713 if (rc->this_key_frame_forced) { 714 int qindex = rc->last_boosted_qindex; 715 double last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); 716 int delta_qindex = av1_compute_qdelta(rc, last_boosted_q, 717 (last_boosted_q * 0.75), bit_depth); 718 active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); 719 } else if (current_frame->frame_number > 0) { 720 // not first frame of one pass and kf_boost is set 721 double q_adj_factor = 1.0; 722 double q_val; 723 724 active_best_quality = 725 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME], bit_depth); 726 727 // Allow somewhat lower kf minq with small image formats. 728 if ((width * height) <= (352 * 288)) { 729 q_adj_factor -= 0.25; 730 } 731 732 // Convert the adjustment factor to a qindex delta 733 // on active_best_quality. 734 q_val = av1_convert_qindex_to_q(active_best_quality, bit_depth); 735 active_best_quality += 736 av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, bit_depth); 737 } 738 } else if (!rc->is_src_frame_alt_ref && 739 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { 740 // Use the lower of active_worst_quality and recent 741 // average Q as basis for GF/ARF best Q limit unless last frame was 742 // a key frame. 743 if (rc->frames_since_key > 1 && 744 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) { 745 q = rc->avg_frame_qindex[INTER_FRAME]; 746 } else { 747 q = active_worst_quality; 748 } 749 active_best_quality = get_gf_active_quality(rc, q, bit_depth); 750 } else { 751 // Use the lower of active_worst_quality and recent/average Q. 752 if (current_frame->frame_number > 1) { 753 if (rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) 754 active_best_quality = rtc_minq[rc->avg_frame_qindex[INTER_FRAME]]; 755 else 756 active_best_quality = rtc_minq[active_worst_quality]; 757 } else { 758 if (rc->avg_frame_qindex[KEY_FRAME] < active_worst_quality) 759 active_best_quality = rtc_minq[rc->avg_frame_qindex[KEY_FRAME]]; 760 else 761 active_best_quality = rtc_minq[active_worst_quality]; 762 } 763 } 764 765 // Clip the active best and worst quality values to limits 766 active_best_quality = 767 clamp(active_best_quality, rc->best_quality, rc->worst_quality); 768 active_worst_quality = 769 clamp(active_worst_quality, active_best_quality, rc->worst_quality); 770 771 *top_index = active_worst_quality; 772 *bottom_index = active_best_quality; 773 774 // Limit Q range for the adaptive loop. 775 if (current_frame->frame_type == KEY_FRAME && !rc->this_key_frame_forced && 776 !(current_frame->frame_number == 0)) { 777 int qdelta = 0; 778 aom_clear_system_state(); 779 qdelta = av1_compute_qdelta_by_rate(&cpi->rc, current_frame->frame_type, 780 active_worst_quality, 2.0, bit_depth); 781 *top_index = active_worst_quality + qdelta; 782 *top_index = AOMMAX(*top_index, *bottom_index); 783 } 784 785 // Special case code to try and match quality with forced key frames 786 if (current_frame->frame_type == KEY_FRAME && rc->this_key_frame_forced) { 787 q = rc->last_boosted_qindex; 788 } else { 789 q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, 790 active_worst_quality, width, height); 791 if (q > *top_index) { 792 // Special case when we are targeting the max allowed rate 793 if (rc->this_frame_target >= rc->max_frame_bandwidth) 794 *top_index = q; 795 else 796 q = *top_index; 797 } 798 } 799 800 assert(*top_index <= rc->worst_quality && *top_index >= rc->best_quality); 801 assert(*bottom_index <= rc->worst_quality && 802 *bottom_index >= rc->best_quality); 803 assert(q <= rc->worst_quality && q >= rc->best_quality); 804 return q; 805 } 806 807 static int gf_group_pyramid_level(const AV1_COMP *cpi) { 808 const GF_GROUP *gf_group = &cpi->twopass.gf_group; 809 int this_height = gf_group->pyramid_level[gf_group->index]; 810 return this_height; 811 } 812 813 static int get_active_cq_level(const RATE_CONTROL *rc, 814 const AV1EncoderConfig *const oxcf, 815 int intra_only, int superres_denom) { 816 static const double cq_adjust_threshold = 0.1; 817 int active_cq_level = oxcf->cq_level; 818 (void)intra_only; 819 if (oxcf->rc_mode == AOM_CQ || oxcf->rc_mode == AOM_Q) { 820 // printf("Superres %d %d %d = %d\n", superres_denom, intra_only, 821 // rc->frames_to_key, !(intra_only && rc->frames_to_key <= 1)); 822 if (oxcf->superres_mode == SUPERRES_QTHRESH && 823 superres_denom != SCALE_NUMERATOR && 824 !(intra_only && rc->frames_to_key <= 1)) { 825 active_cq_level = 826 AOMMAX(active_cq_level - ((superres_denom - SCALE_NUMERATOR) * 4), 0); 827 } 828 } 829 if (oxcf->rc_mode == AOM_CQ && rc->total_target_bits > 0) { 830 const double x = (double)rc->total_actual_bits / rc->total_target_bits; 831 if (x < cq_adjust_threshold) { 832 active_cq_level = (int)(active_cq_level * x / cq_adjust_threshold); 833 } 834 } 835 return active_cq_level; 836 } 837 838 static int rc_pick_q_and_bounds_one_pass_vbr(const AV1_COMP *cpi, int width, 839 int height, int *bottom_index, 840 int *top_index) { 841 const AV1_COMMON *const cm = &cpi->common; 842 const RATE_CONTROL *const rc = &cpi->rc; 843 const CurrentFrame *const current_frame = &cm->current_frame; 844 const AV1EncoderConfig *const oxcf = &cpi->oxcf; 845 const int cq_level = get_active_cq_level(rc, oxcf, frame_is_intra_only(cm), 846 cm->superres_scale_denominator); 847 int active_best_quality; 848 int active_worst_quality = calc_active_worst_quality_one_pass_vbr(cpi); 849 int q; 850 int *inter_minq; 851 const int bit_depth = cm->seq_params.bit_depth; 852 ASSIGN_MINQ_TABLE(bit_depth, inter_minq); 853 854 if (frame_is_intra_only(cm)) { 855 if (oxcf->rc_mode == AOM_Q) { 856 const int qindex = cq_level; 857 const double q_val = av1_convert_qindex_to_q(qindex, bit_depth); 858 const int delta_qindex = 859 av1_compute_qdelta(rc, q_val, q_val * 0.25, bit_depth); 860 active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); 861 } else if (rc->this_key_frame_forced) { 862 const int qindex = rc->last_boosted_qindex; 863 const double last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); 864 const int delta_qindex = av1_compute_qdelta( 865 rc, last_boosted_q, last_boosted_q * 0.75, bit_depth); 866 active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); 867 } else { // not first frame of one pass and kf_boost is set 868 double q_adj_factor = 1.0; 869 870 active_best_quality = 871 get_kf_active_quality(rc, rc->avg_frame_qindex[KEY_FRAME], bit_depth); 872 873 // Allow somewhat lower kf minq with small image formats. 874 if ((width * height) <= (352 * 288)) { 875 q_adj_factor -= 0.25; 876 } 877 878 // Convert the adjustment factor to a qindex delta on active_best_quality. 879 { 880 const double q_val = 881 av1_convert_qindex_to_q(active_best_quality, bit_depth); 882 active_best_quality += 883 av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, bit_depth); 884 } 885 } 886 } else if (!rc->is_src_frame_alt_ref && 887 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { 888 // Use the lower of active_worst_quality and recent 889 // average Q as basis for GF/ARF best Q limit unless last frame was 890 // a key frame. 891 q = (rc->frames_since_key > 1 && 892 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) 893 ? rc->avg_frame_qindex[INTER_FRAME] 894 : rc->avg_frame_qindex[KEY_FRAME]; 895 // For constrained quality dont allow Q less than the cq level 896 if (oxcf->rc_mode == AOM_CQ) { 897 if (q < cq_level) q = cq_level; 898 active_best_quality = get_gf_active_quality(rc, q, bit_depth); 899 // Constrained quality use slightly lower active best. 900 active_best_quality = active_best_quality * 15 / 16; 901 } else if (oxcf->rc_mode == AOM_Q) { 902 const int qindex = cq_level; 903 const double q_val = av1_convert_qindex_to_q(qindex, bit_depth); 904 const int delta_qindex = 905 (cpi->refresh_alt_ref_frame) 906 ? av1_compute_qdelta(rc, q_val, q_val * 0.40, bit_depth) 907 : av1_compute_qdelta(rc, q_val, q_val * 0.50, bit_depth); 908 active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); 909 } else { 910 active_best_quality = get_gf_active_quality(rc, q, bit_depth); 911 } 912 } else { 913 if (oxcf->rc_mode == AOM_Q) { 914 const int qindex = cq_level; 915 const double q_val = av1_convert_qindex_to_q(qindex, bit_depth); 916 const double delta_rate[FIXED_GF_INTERVAL] = { 0.50, 1.0, 0.85, 1.0, 917 0.70, 1.0, 0.85, 1.0 }; 918 const int delta_qindex = av1_compute_qdelta( 919 rc, q_val, 920 q_val * delta_rate[current_frame->frame_number % FIXED_GF_INTERVAL], 921 bit_depth); 922 active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); 923 } else { 924 // Use the lower of active_worst_quality and recent/average Q. 925 active_best_quality = (current_frame->frame_number > 1) 926 ? inter_minq[rc->avg_frame_qindex[INTER_FRAME]] 927 : inter_minq[rc->avg_frame_qindex[KEY_FRAME]]; 928 // For the constrained quality mode we don't want 929 // q to fall below the cq level. 930 if ((oxcf->rc_mode == AOM_CQ) && (active_best_quality < cq_level)) { 931 active_best_quality = cq_level; 932 } 933 } 934 } 935 936 // Clip the active best and worst quality values to limits 937 active_best_quality = 938 clamp(active_best_quality, rc->best_quality, rc->worst_quality); 939 active_worst_quality = 940 clamp(active_worst_quality, active_best_quality, rc->worst_quality); 941 942 *top_index = active_worst_quality; 943 *bottom_index = active_best_quality; 944 945 // Limit Q range for the adaptive loop. 946 { 947 int qdelta = 0; 948 aom_clear_system_state(); 949 if (current_frame->frame_type == KEY_FRAME && !rc->this_key_frame_forced && 950 !(current_frame->frame_number == 0)) { 951 qdelta = av1_compute_qdelta_by_rate(&cpi->rc, current_frame->frame_type, 952 active_worst_quality, 2.0, bit_depth); 953 } else if (!rc->is_src_frame_alt_ref && 954 (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { 955 qdelta = 956 av1_compute_qdelta_by_rate(&cpi->rc, current_frame->frame_type, 957 active_worst_quality, 1.75, bit_depth); 958 } 959 *top_index = active_worst_quality + qdelta; 960 *top_index = AOMMAX(*top_index, *bottom_index); 961 } 962 963 if (oxcf->rc_mode == AOM_Q) { 964 q = active_best_quality; 965 // Special case code to try and match quality with forced key frames 966 } else if ((current_frame->frame_type == KEY_FRAME) && 967 rc->this_key_frame_forced) { 968 q = rc->last_boosted_qindex; 969 } else { 970 q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, 971 active_worst_quality, width, height); 972 if (q > *top_index) { 973 // Special case when we are targeting the max allowed rate 974 if (rc->this_frame_target >= rc->max_frame_bandwidth) 975 *top_index = q; 976 else 977 q = *top_index; 978 } 979 } 980 981 assert(*top_index <= rc->worst_quality && *top_index >= rc->best_quality); 982 assert(*bottom_index <= rc->worst_quality && 983 *bottom_index >= rc->best_quality); 984 assert(q <= rc->worst_quality && q >= rc->best_quality); 985 return q; 986 } 987 988 static const double rate_factor_deltas[RATE_FACTOR_LEVELS] = { 989 1.00, // INTER_NORMAL 990 1.25, // GF_ARF_LOW 991 2.00, // GF_ARF_STD 992 2.00, // KF_STD 993 }; 994 995 int av1_frame_type_qdelta(const AV1_COMP *cpi, int q) { 996 const RATE_FACTOR_LEVEL rf_lvl = 997 get_rate_factor_level(&cpi->twopass.gf_group); 998 const FRAME_TYPE frame_type = (rf_lvl == KF_STD) ? KEY_FRAME : INTER_FRAME; 999 return av1_compute_qdelta_by_rate(&cpi->rc, frame_type, q, 1000 rate_factor_deltas[rf_lvl], 1001 cpi->common.seq_params.bit_depth); 1002 } 1003 1004 #define STATIC_MOTION_THRESH 95 1005 static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int width, 1006 int height, int *bottom_index, 1007 int *top_index, int *arf_q) { 1008 const AV1_COMMON *const cm = &cpi->common; 1009 const RATE_CONTROL *const rc = &cpi->rc; 1010 const AV1EncoderConfig *const oxcf = &cpi->oxcf; 1011 const GF_GROUP *gf_group = &cpi->twopass.gf_group; 1012 const int cq_level = get_active_cq_level(rc, oxcf, frame_is_intra_only(cm), 1013 cm->superres_scale_denominator); 1014 int active_best_quality; 1015 int active_worst_quality = cpi->twopass.active_worst_quality; 1016 int q; 1017 int *inter_minq; 1018 const int bit_depth = cm->seq_params.bit_depth; 1019 ASSIGN_MINQ_TABLE(bit_depth, inter_minq); 1020 1021 const int is_intrl_arf_boost = 1022 gf_group->update_type[gf_group->index] == INTNL_ARF_UPDATE; 1023 1024 if (frame_is_intra_only(cm)) { 1025 if (rc->frames_to_key == 1 && oxcf->rc_mode == AOM_Q) { 1026 // If the next frame is also a key frame or the current frame is the 1027 // only frame in the sequence in AOM_Q mode, just use the cq_level 1028 // as q. 1029 active_best_quality = cq_level; 1030 active_worst_quality = cq_level; 1031 } else if (cm->current_frame.frame_type == KEY_FRAME && 1032 cm->show_frame == 0) { 1033 // Handle the special case for forward reference key frames. 1034 // Increase the boost because this keyframe is used as a forward and 1035 // backward reference. 1036 const int qindex = rc->last_boosted_qindex; 1037 const double last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); 1038 const int delta_qindex = av1_compute_qdelta( 1039 rc, last_boosted_q, last_boosted_q * 0.25, bit_depth); 1040 active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); 1041 // Update the arf_q since the forward keyframe is replacing the ALTREF 1042 *arf_q = active_best_quality; 1043 } else if (rc->this_key_frame_forced) { 1044 // Handle the special case for key frames forced when we have reached 1045 // the maximum key frame interval. Here force the Q to a range 1046 // based on the ambient Q to reduce the risk of popping. 1047 double last_boosted_q; 1048 int delta_qindex; 1049 int qindex; 1050 1051 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) { 1052 qindex = AOMMIN(rc->last_kf_qindex, rc->last_boosted_qindex); 1053 active_best_quality = qindex; 1054 last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); 1055 delta_qindex = av1_compute_qdelta(rc, last_boosted_q, 1056 last_boosted_q * 1.25, bit_depth); 1057 active_worst_quality = 1058 AOMMIN(qindex + delta_qindex, active_worst_quality); 1059 } else { 1060 qindex = rc->last_boosted_qindex; 1061 last_boosted_q = av1_convert_qindex_to_q(qindex, bit_depth); 1062 delta_qindex = av1_compute_qdelta(rc, last_boosted_q, 1063 last_boosted_q * 0.50, bit_depth); 1064 active_best_quality = AOMMAX(qindex + delta_qindex, rc->best_quality); 1065 } 1066 } else { 1067 // Not forced keyframe. 1068 double q_adj_factor = 1.0; 1069 double q_val; 1070 1071 // Baseline value derived from cpi->active_worst_quality and kf boost. 1072 active_best_quality = 1073 get_kf_active_quality(rc, active_worst_quality, bit_depth); 1074 1075 if (cpi->twopass.kf_zeromotion_pct >= STATIC_KF_GROUP_THRESH) { 1076 active_best_quality /= 3; 1077 } 1078 1079 // Allow somewhat lower kf minq with small image formats. 1080 if ((width * height) <= (352 * 288)) { 1081 q_adj_factor -= 0.25; 1082 } 1083 1084 // Make a further adjustment based on the kf zero motion measure. 1085 q_adj_factor += 0.05 - (0.001 * (double)cpi->twopass.kf_zeromotion_pct); 1086 1087 // Convert the adjustment factor to a qindex delta 1088 // on active_best_quality. 1089 q_val = av1_convert_qindex_to_q(active_best_quality, bit_depth); 1090 active_best_quality += 1091 av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, bit_depth); 1092 } 1093 } else if (!rc->is_src_frame_alt_ref && 1094 (cpi->refresh_golden_frame || is_intrl_arf_boost || 1095 cpi->refresh_alt_ref_frame)) { 1096 // Use the lower of active_worst_quality and recent 1097 // average Q as basis for GF/ARF best Q limit unless last frame was 1098 // a key frame. 1099 if (rc->frames_since_key > 1 && 1100 rc->avg_frame_qindex[INTER_FRAME] < active_worst_quality) { 1101 q = rc->avg_frame_qindex[INTER_FRAME]; 1102 } else { 1103 q = active_worst_quality; 1104 } 1105 // For constrained quality dont allow Q less than the cq level 1106 if (oxcf->rc_mode == AOM_CQ) { 1107 if (q < cq_level) q = cq_level; 1108 1109 active_best_quality = get_gf_active_quality(rc, q, bit_depth); 1110 1111 // Constrained quality use slightly lower active best. 1112 active_best_quality = active_best_quality * 15 / 16; 1113 1114 if (gf_group->update_type[gf_group->index] == ARF_UPDATE) { 1115 const int min_boost = get_gf_high_motion_quality(q, bit_depth); 1116 const int boost = min_boost - active_best_quality; 1117 1118 active_best_quality = min_boost - (int)(boost * rc->arf_boost_factor); 1119 *arf_q = active_best_quality; 1120 } else if (is_intrl_arf_boost) { 1121 assert(rc->arf_q >= 0); // Ensure it is set to a valid value. 1122 active_best_quality = rc->arf_q; 1123 int this_height = gf_group_pyramid_level(cpi); 1124 while (this_height < gf_group->pyramid_height) { 1125 active_best_quality = (active_best_quality + cq_level + 1) / 2; 1126 ++this_height; 1127 } 1128 } 1129 } else if (oxcf->rc_mode == AOM_Q) { 1130 if (!cpi->refresh_alt_ref_frame && !is_intrl_arf_boost) { 1131 active_best_quality = cq_level; 1132 } else { 1133 if (gf_group->update_type[gf_group->index] == ARF_UPDATE) { 1134 active_best_quality = get_gf_active_quality(rc, q, bit_depth); 1135 const int min_boost = get_gf_high_motion_quality(q, bit_depth); 1136 const int boost = min_boost - active_best_quality; 1137 1138 active_best_quality = min_boost - (int)(boost * rc->arf_boost_factor); 1139 *arf_q = active_best_quality; 1140 } else { 1141 assert(rc->arf_q >= 0); // Ensure it is set to a valid value. 1142 assert(is_intrl_arf_boost); 1143 active_best_quality = rc->arf_q; 1144 int this_height = gf_group_pyramid_level(cpi); 1145 while (this_height < gf_group->pyramid_height) { 1146 active_best_quality = (active_best_quality + cq_level + 1) / 2; 1147 ++this_height; 1148 } 1149 } 1150 } 1151 } else { 1152 active_best_quality = get_gf_active_quality(rc, q, bit_depth); 1153 const int min_boost = get_gf_high_motion_quality(q, bit_depth); 1154 const int boost = min_boost - active_best_quality; 1155 1156 active_best_quality = min_boost - (int)(boost * rc->arf_boost_factor); 1157 if (is_intrl_arf_boost) { 1158 int this_height = gf_group_pyramid_level(cpi); 1159 while (this_height < gf_group->pyramid_height) { 1160 active_best_quality = 1161 (active_best_quality + active_worst_quality + 1) / 2; 1162 ++this_height; 1163 } 1164 } 1165 } 1166 } else { 1167 if (oxcf->rc_mode == AOM_Q) { 1168 active_best_quality = cq_level; 1169 } else { 1170 active_best_quality = inter_minq[active_worst_quality]; 1171 1172 // For the constrained quality mode we don't want 1173 // q to fall below the cq level. 1174 if ((oxcf->rc_mode == AOM_CQ) && (active_best_quality < cq_level)) { 1175 active_best_quality = cq_level; 1176 } 1177 } 1178 } 1179 1180 // Extension to max or min Q if undershoot or overshoot is outside 1181 // the permitted range. 1182 if (cpi->oxcf.rc_mode != AOM_Q) { 1183 if (frame_is_intra_only(cm) || 1184 (!rc->is_src_frame_alt_ref && 1185 (cpi->refresh_golden_frame || is_intrl_arf_boost || 1186 cpi->refresh_alt_ref_frame))) { 1187 active_best_quality -= 1188 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast); 1189 active_worst_quality += (cpi->twopass.extend_maxq / 2); 1190 } else { 1191 active_best_quality -= 1192 (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast) / 2; 1193 active_worst_quality += cpi->twopass.extend_maxq; 1194 } 1195 } 1196 1197 aom_clear_system_state(); 1198 // Static forced key frames Q restrictions dealt with elsewhere. 1199 if (!(frame_is_intra_only(cm)) || !rc->this_key_frame_forced || 1200 (cpi->twopass.last_kfgroup_zeromotion_pct < STATIC_MOTION_THRESH)) { 1201 const int qdelta = av1_frame_type_qdelta(cpi, active_worst_quality); 1202 active_worst_quality = 1203 AOMMAX(active_worst_quality + qdelta, active_best_quality); 1204 } 1205 1206 // Modify active_best_quality for downscaled normal frames. 1207 if (av1_frame_scaled(cm) && !frame_is_kf_gf_arf(cpi)) { 1208 int qdelta = av1_compute_qdelta_by_rate( 1209 rc, cm->current_frame.frame_type, active_best_quality, 2.0, bit_depth); 1210 active_best_quality = 1211 AOMMAX(active_best_quality + qdelta, rc->best_quality); 1212 } 1213 1214 active_best_quality = 1215 clamp(active_best_quality, rc->best_quality, rc->worst_quality); 1216 active_worst_quality = 1217 clamp(active_worst_quality, active_best_quality, rc->worst_quality); 1218 1219 if (oxcf->rc_mode == AOM_Q || 1220 (frame_is_intra_only(cm) && !rc->this_key_frame_forced && 1221 cpi->twopass.kf_zeromotion_pct >= STATIC_KF_GROUP_THRESH && 1222 rc->frames_to_key > 1)) { 1223 q = active_best_quality; 1224 // Special case code to try and match quality with forced key frames. 1225 } else if (frame_is_intra_only(cm) && rc->this_key_frame_forced) { 1226 // If static since last kf use better of last boosted and last kf q. 1227 if (cpi->twopass.last_kfgroup_zeromotion_pct >= STATIC_MOTION_THRESH) { 1228 q = AOMMIN(rc->last_kf_qindex, rc->last_boosted_qindex); 1229 } else { 1230 q = AOMMIN(rc->last_boosted_qindex, 1231 (active_best_quality + active_worst_quality) / 2); 1232 } 1233 } else { 1234 q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, 1235 active_worst_quality, width, height); 1236 if (q > active_worst_quality) { 1237 // Special case when we are targeting the max allowed rate. 1238 if (rc->this_frame_target >= rc->max_frame_bandwidth) 1239 active_worst_quality = q; 1240 else 1241 q = active_worst_quality; 1242 } 1243 } 1244 clamp(q, active_best_quality, active_worst_quality); 1245 1246 *top_index = active_worst_quality; 1247 *bottom_index = active_best_quality; 1248 1249 assert(*top_index <= rc->worst_quality && *top_index >= rc->best_quality); 1250 assert(*bottom_index <= rc->worst_quality && 1251 *bottom_index >= rc->best_quality); 1252 assert(q <= rc->worst_quality && q >= rc->best_quality); 1253 return q; 1254 } 1255 1256 int av1_rc_pick_q_and_bounds(AV1_COMP *cpi, int width, int height, 1257 int *bottom_index, int *top_index) { 1258 int q; 1259 if (cpi->oxcf.pass == 0) { 1260 if (cpi->oxcf.rc_mode == AOM_CBR) 1261 q = rc_pick_q_and_bounds_one_pass_cbr(cpi, width, height, bottom_index, 1262 top_index); 1263 else 1264 q = rc_pick_q_and_bounds_one_pass_vbr(cpi, width, height, bottom_index, 1265 top_index); 1266 } else { 1267 assert(cpi->oxcf.pass == 2 && "invalid encode pass"); 1268 1269 GF_GROUP *gf_group = &cpi->twopass.gf_group; 1270 int arf_q = -1; // Initialize to invalid value, for sanity check later. 1271 1272 q = rc_pick_q_and_bounds_two_pass(cpi, width, height, bottom_index, 1273 top_index, &arf_q); 1274 1275 if (gf_group->update_type[gf_group->index] == ARF_UPDATE) { 1276 cpi->rc.arf_q = arf_q; 1277 } 1278 } 1279 1280 return q; 1281 } 1282 1283 void av1_rc_compute_frame_size_bounds(const AV1_COMP *cpi, int frame_target, 1284 int *frame_under_shoot_limit, 1285 int *frame_over_shoot_limit) { 1286 if (cpi->oxcf.rc_mode == AOM_Q) { 1287 *frame_under_shoot_limit = 0; 1288 *frame_over_shoot_limit = INT_MAX; 1289 } else { 1290 // For very small rate targets where the fractional adjustment 1291 // may be tiny make sure there is at least a minimum range. 1292 const int tolerance = (cpi->sf.recode_tolerance * frame_target) / 100; 1293 *frame_under_shoot_limit = AOMMAX(frame_target - tolerance - 200, 0); 1294 *frame_over_shoot_limit = 1295 AOMMIN(frame_target + tolerance + 200, cpi->rc.max_frame_bandwidth); 1296 } 1297 } 1298 1299 static void rc_set_frame_target(AV1_COMP *cpi, int target, int width, 1300 int height) { 1301 const AV1_COMMON *const cm = &cpi->common; 1302 RATE_CONTROL *const rc = &cpi->rc; 1303 1304 rc->this_frame_target = target; 1305 1306 // Modify frame size target when down-scaled. 1307 if (av1_frame_scaled(cm)) 1308 rc->this_frame_target = 1309 (int)(rc->this_frame_target * resize_rate_factor(cpi, width, height)); 1310 1311 // Target rate per SB64 (including partial SB64s. 1312 rc->sb64_target_rate = 1313 (int)((int64_t)rc->this_frame_target * 64 * 64) / (width * height); 1314 } 1315 1316 static void update_alt_ref_frame_stats(AV1_COMP *cpi) { 1317 // this frame refreshes means next frames don't unless specified by user 1318 RATE_CONTROL *const rc = &cpi->rc; 1319 rc->frames_since_golden = 0; 1320 1321 // Mark the alt ref as done (setting to 0 means no further alt refs pending). 1322 rc->source_alt_ref_pending = 0; 1323 1324 // Set the alternate reference frame active flag 1325 rc->source_alt_ref_active = 1; 1326 } 1327 1328 static void update_golden_frame_stats(AV1_COMP *cpi) { 1329 RATE_CONTROL *const rc = &cpi->rc; 1330 const TWO_PASS *const twopass = &cpi->twopass; 1331 const GF_GROUP *const gf_group = &twopass->gf_group; 1332 const int is_intrnl_arf = 1333 cpi->oxcf.pass == 2 1334 ? gf_group->update_type[gf_group->index] == INTNL_ARF_UPDATE 1335 : cpi->refresh_alt2_ref_frame; 1336 1337 // Update the Golden frame usage counts. 1338 // NOTE(weitinglin): If we use show_existing_frame for an OVERLAY frame, 1339 // only the virtual indices for the reference frame will be 1340 // updated and cpi->refresh_golden_frame will still be zero. 1341 if (cpi->refresh_golden_frame || rc->is_src_frame_alt_ref) { 1342 // We will not use internal overlay frames to replace the golden frame 1343 if (!rc->is_src_frame_internal_arf) { 1344 // this frame refreshes means next frames don't unless specified by user 1345 rc->frames_since_golden = 0; 1346 } 1347 1348 // If we are not using alt ref in the up and coming group clear the arf 1349 // active flag. In multi arf group case, if the index is not 0 then 1350 // we are overlaying a mid group arf so should not reset the flag. 1351 if (cpi->oxcf.pass == 2) { 1352 if (!rc->source_alt_ref_pending && (cpi->twopass.gf_group.index == 0)) 1353 rc->source_alt_ref_active = 0; 1354 } else if (!rc->source_alt_ref_pending) { 1355 rc->source_alt_ref_active = 0; 1356 } 1357 } else if (!cpi->refresh_alt_ref_frame && !is_intrnl_arf) { 1358 rc->frames_since_golden++; 1359 } 1360 } 1361 1362 void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { 1363 const AV1_COMMON *const cm = &cpi->common; 1364 const CurrentFrame *const current_frame = &cm->current_frame; 1365 RATE_CONTROL *const rc = &cpi->rc; 1366 const TWO_PASS *const twopass = &cpi->twopass; 1367 const GF_GROUP *const gf_group = &twopass->gf_group; 1368 const int is_intrnl_arf = 1369 cpi->oxcf.pass == 2 1370 ? gf_group->update_type[gf_group->index] == INTNL_ARF_UPDATE 1371 : cpi->refresh_alt2_ref_frame; 1372 1373 const int qindex = cm->base_qindex; 1374 1375 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) { 1376 av1_cyclic_refresh_postencode(cpi); 1377 } 1378 1379 // Update rate control heuristics 1380 rc->projected_frame_size = (int)(bytes_used << 3); 1381 1382 // Post encode loop adjustment of Q prediction. 1383 av1_rc_update_rate_correction_factors(cpi, cm->width, cm->height); 1384 1385 // Keep a record of last Q and ambient average Q. 1386 if (current_frame->frame_type == KEY_FRAME) { 1387 rc->last_q[KEY_FRAME] = qindex; 1388 rc->avg_frame_qindex[KEY_FRAME] = 1389 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2); 1390 } else { 1391 if (!rc->is_src_frame_alt_ref && 1392 !(cpi->refresh_golden_frame || is_intrnl_arf || 1393 cpi->refresh_alt_ref_frame)) { 1394 rc->last_q[INTER_FRAME] = qindex; 1395 rc->avg_frame_qindex[INTER_FRAME] = 1396 ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2); 1397 rc->ni_frames++; 1398 rc->tot_q += av1_convert_qindex_to_q(qindex, cm->seq_params.bit_depth); 1399 rc->avg_q = rc->tot_q / rc->ni_frames; 1400 // Calculate the average Q for normal inter frames (not key or GFU 1401 // frames). 1402 rc->ni_tot_qi += qindex; 1403 rc->ni_av_qi = rc->ni_tot_qi / rc->ni_frames; 1404 } 1405 } 1406 1407 // Keep record of last boosted (KF/GF/ARF) Q value. 1408 // If the current frame is coded at a lower Q then we also update it. 1409 // If all mbs in this group are skipped only update if the Q value is 1410 // better than that already stored. 1411 // This is used to help set quality in forced key frames to reduce popping 1412 if ((qindex < rc->last_boosted_qindex) || 1413 (current_frame->frame_type == KEY_FRAME) || 1414 (!rc->constrained_gf_group && 1415 (cpi->refresh_alt_ref_frame || is_intrnl_arf || 1416 (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) { 1417 rc->last_boosted_qindex = qindex; 1418 } 1419 if (current_frame->frame_type == KEY_FRAME) rc->last_kf_qindex = qindex; 1420 1421 update_buffer_level(cpi, rc->projected_frame_size); 1422 1423 // Rolling monitors of whether we are over or underspending used to help 1424 // regulate min and Max Q in two pass. 1425 if (av1_frame_scaled(cm)) 1426 rc->this_frame_target = 1427 (int)(rc->this_frame_target / 1428 resize_rate_factor(cpi, cm->width, cm->height)); 1429 if (current_frame->frame_type != KEY_FRAME) { 1430 rc->rolling_target_bits = ROUND_POWER_OF_TWO( 1431 rc->rolling_target_bits * 3 + rc->this_frame_target, 2); 1432 rc->rolling_actual_bits = ROUND_POWER_OF_TWO( 1433 rc->rolling_actual_bits * 3 + rc->projected_frame_size, 2); 1434 rc->long_rolling_target_bits = ROUND_POWER_OF_TWO( 1435 rc->long_rolling_target_bits * 31 + rc->this_frame_target, 5); 1436 rc->long_rolling_actual_bits = ROUND_POWER_OF_TWO( 1437 rc->long_rolling_actual_bits * 31 + rc->projected_frame_size, 5); 1438 } 1439 1440 // Actual bits spent 1441 rc->total_actual_bits += rc->projected_frame_size; 1442 rc->total_target_bits += cm->show_frame ? rc->avg_frame_bandwidth : 0; 1443 1444 rc->total_target_vs_actual = rc->total_actual_bits - rc->total_target_bits; 1445 1446 if (is_altref_enabled(cpi) && cpi->refresh_alt_ref_frame && 1447 (current_frame->frame_type != KEY_FRAME)) 1448 // Update the alternate reference frame stats as appropriate. 1449 update_alt_ref_frame_stats(cpi); 1450 else 1451 // Update the Golden frame stats as appropriate. 1452 update_golden_frame_stats(cpi); 1453 1454 if (current_frame->frame_type == KEY_FRAME) rc->frames_since_key = 0; 1455 // if (current_frame->frame_number == 1 && cm->show_frame) 1456 /* 1457 rc->this_frame_target = 1458 (int)(rc->this_frame_target / resize_rate_factor(cpi, cm->width, 1459 cm->height)); 1460 */ 1461 } 1462 1463 void av1_rc_postencode_update_drop_frame(AV1_COMP *cpi) { 1464 // Update buffer level with zero size, update frame counters, and return. 1465 update_buffer_level(cpi, 0); 1466 cpi->rc.frames_since_key++; 1467 cpi->rc.frames_to_key--; 1468 cpi->rc.rc_2_frame = 0; 1469 cpi->rc.rc_1_frame = 0; 1470 } 1471 1472 // Use this macro to turn on/off use of alt-refs in one-pass mode. 1473 #define USE_ALTREF_FOR_ONE_PASS 1 1474 1475 static int calc_pframe_target_size_one_pass_vbr( 1476 const AV1_COMP *const cpi, FRAME_UPDATE_TYPE frame_update_type) { 1477 static const int af_ratio = 10; 1478 const RATE_CONTROL *const rc = &cpi->rc; 1479 int target; 1480 #if USE_ALTREF_FOR_ONE_PASS 1481 if (frame_update_type == KF_UPDATE || frame_update_type == GF_UPDATE || 1482 frame_update_type == ARF_UPDATE) { 1483 target = (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio) / 1484 (rc->baseline_gf_interval + af_ratio - 1); 1485 } else { 1486 target = (rc->avg_frame_bandwidth * rc->baseline_gf_interval) / 1487 (rc->baseline_gf_interval + af_ratio - 1); 1488 } 1489 #else 1490 target = rc->avg_frame_bandwidth; 1491 #endif 1492 return av1_rc_clamp_pframe_target_size(cpi, target, frame_update_type); 1493 } 1494 1495 static int calc_iframe_target_size_one_pass_vbr(const AV1_COMP *const cpi) { 1496 static const int kf_ratio = 25; 1497 const RATE_CONTROL *rc = &cpi->rc; 1498 const int target = rc->avg_frame_bandwidth * kf_ratio; 1499 return av1_rc_clamp_iframe_target_size(cpi, target); 1500 } 1501 1502 void av1_rc_get_one_pass_vbr_params(AV1_COMP *cpi, 1503 FRAME_UPDATE_TYPE *const frame_update_type, 1504 EncodeFrameParams *const frame_params, 1505 unsigned int frame_flags) { 1506 AV1_COMMON *const cm = &cpi->common; 1507 RATE_CONTROL *const rc = &cpi->rc; 1508 CurrentFrame *const current_frame = &cm->current_frame; 1509 int target; 1510 int altref_enabled = is_altref_enabled(cpi); 1511 int sframe_dist = cpi->oxcf.sframe_dist; 1512 int sframe_mode = cpi->oxcf.sframe_mode; 1513 int sframe_enabled = cpi->oxcf.sframe_enabled; 1514 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic. 1515 if (*frame_update_type != ARF_UPDATE && 1516 (current_frame->frame_number == 0 || (frame_flags & FRAMEFLAGS_KEY) || 1517 rc->frames_to_key == 0 || (cpi->oxcf.auto_key && 0))) { 1518 frame_params->frame_type = KEY_FRAME; 1519 rc->this_key_frame_forced = 1520 current_frame->frame_number != 0 && rc->frames_to_key == 0; 1521 rc->frames_to_key = cpi->oxcf.key_freq; 1522 rc->kf_boost = DEFAULT_KF_BOOST; 1523 rc->source_alt_ref_active = 0; 1524 } else { 1525 frame_params->frame_type = INTER_FRAME; 1526 if (sframe_enabled) { 1527 if (altref_enabled) { 1528 if (sframe_mode == 1) { 1529 // sframe_mode == 1: insert sframe if it matches altref frame. 1530 1531 if (current_frame->frame_number % sframe_dist == 0 && 1532 current_frame->frame_number != 0 && 1533 *frame_update_type == ARF_UPDATE) { 1534 frame_params->frame_type = S_FRAME; 1535 } 1536 } else { 1537 // sframe_mode != 1: if sframe will be inserted at the next available 1538 // altref frame 1539 1540 if (current_frame->frame_number % sframe_dist == 0 && 1541 current_frame->frame_number != 0) { 1542 rc->sframe_due = 1; 1543 } 1544 1545 if (rc->sframe_due && *frame_update_type == ARF_UPDATE) { 1546 frame_params->frame_type = S_FRAME; 1547 rc->sframe_due = 0; 1548 } 1549 } 1550 } else { 1551 if (current_frame->frame_number % sframe_dist == 0 && 1552 current_frame->frame_number != 0) { 1553 frame_params->frame_type = S_FRAME; 1554 } 1555 } 1556 } 1557 } 1558 if (rc->frames_till_gf_update_due == 0) { 1559 rc->baseline_gf_interval = (rc->min_gf_interval + rc->max_gf_interval) / 2; 1560 rc->frames_till_gf_update_due = rc->baseline_gf_interval; 1561 // NOTE: frames_till_gf_update_due must be <= frames_to_key. 1562 if (rc->frames_till_gf_update_due > rc->frames_to_key) { 1563 rc->frames_till_gf_update_due = rc->frames_to_key; 1564 rc->constrained_gf_group = 1; 1565 } else { 1566 rc->constrained_gf_group = 0; 1567 } 1568 if (*frame_update_type == LF_UPDATE) *frame_update_type = GF_UPDATE; 1569 rc->source_alt_ref_pending = USE_ALTREF_FOR_ONE_PASS; 1570 rc->gfu_boost = DEFAULT_GF_BOOST; 1571 } 1572 1573 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) 1574 av1_cyclic_refresh_update_parameters(cpi); 1575 1576 if (frame_params->frame_type == KEY_FRAME) 1577 target = calc_iframe_target_size_one_pass_vbr(cpi); 1578 else 1579 target = calc_pframe_target_size_one_pass_vbr(cpi, *frame_update_type); 1580 rc_set_frame_target(cpi, target, cm->width, cm->height); 1581 } 1582 1583 static int calc_pframe_target_size_one_pass_cbr( 1584 const AV1_COMP *cpi, FRAME_UPDATE_TYPE frame_update_type) { 1585 const AV1EncoderConfig *oxcf = &cpi->oxcf; 1586 const RATE_CONTROL *rc = &cpi->rc; 1587 const int64_t diff = rc->optimal_buffer_level - rc->buffer_level; 1588 const int64_t one_pct_bits = 1 + rc->optimal_buffer_level / 100; 1589 int min_frame_target = 1590 AOMMAX(rc->avg_frame_bandwidth >> 4, FRAME_OVERHEAD_BITS); 1591 int target; 1592 1593 if (oxcf->gf_cbr_boost_pct) { 1594 const int af_ratio_pct = oxcf->gf_cbr_boost_pct + 100; 1595 if (frame_update_type == GF_UPDATE || frame_update_type == OVERLAY_UPDATE) { 1596 target = 1597 (rc->avg_frame_bandwidth * rc->baseline_gf_interval * af_ratio_pct) / 1598 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100); 1599 } else { 1600 target = (rc->avg_frame_bandwidth * rc->baseline_gf_interval * 100) / 1601 (rc->baseline_gf_interval * 100 + af_ratio_pct - 100); 1602 } 1603 } else { 1604 target = rc->avg_frame_bandwidth; 1605 } 1606 1607 if (diff > 0) { 1608 // Lower the target bandwidth for this frame. 1609 const int pct_low = (int)AOMMIN(diff / one_pct_bits, oxcf->under_shoot_pct); 1610 target -= (target * pct_low) / 200; 1611 } else if (diff < 0) { 1612 // Increase the target bandwidth for this frame. 1613 const int pct_high = 1614 (int)AOMMIN(-diff / one_pct_bits, oxcf->over_shoot_pct); 1615 target += (target * pct_high) / 200; 1616 } 1617 if (oxcf->rc_max_inter_bitrate_pct) { 1618 const int max_rate = 1619 rc->avg_frame_bandwidth * oxcf->rc_max_inter_bitrate_pct / 100; 1620 target = AOMMIN(target, max_rate); 1621 } 1622 return AOMMAX(min_frame_target, target); 1623 } 1624 1625 static int calc_iframe_target_size_one_pass_cbr(const AV1_COMP *cpi) { 1626 const RATE_CONTROL *rc = &cpi->rc; 1627 int target; 1628 if (cpi->common.current_frame.frame_number == 0) { 1629 target = ((rc->starting_buffer_level / 2) > INT_MAX) 1630 ? INT_MAX 1631 : (int)(rc->starting_buffer_level / 2); 1632 } else { 1633 int kf_boost = 32; 1634 double framerate = cpi->framerate; 1635 1636 kf_boost = AOMMAX(kf_boost, (int)(2 * framerate - 16)); 1637 if (rc->frames_since_key < framerate / 2) { 1638 kf_boost = (int)(kf_boost * rc->frames_since_key / (framerate / 2)); 1639 } 1640 target = ((16 + kf_boost) * rc->avg_frame_bandwidth) >> 4; 1641 } 1642 return av1_rc_clamp_iframe_target_size(cpi, target); 1643 } 1644 1645 void av1_rc_get_one_pass_cbr_params(AV1_COMP *cpi, 1646 FRAME_UPDATE_TYPE *const frame_update_type, 1647 EncodeFrameParams *const frame_params, 1648 unsigned int frame_flags) { 1649 AV1_COMMON *const cm = &cpi->common; 1650 RATE_CONTROL *const rc = &cpi->rc; 1651 CurrentFrame *const current_frame = &cm->current_frame; 1652 int target; 1653 // TODO(yaowu): replace the "auto_key && 0" below with proper decision logic. 1654 if ((current_frame->frame_number == 0 || (frame_flags & FRAMEFLAGS_KEY) || 1655 rc->frames_to_key == 0 || (cpi->oxcf.auto_key && 0))) { 1656 frame_params->frame_type = KEY_FRAME; 1657 rc->this_key_frame_forced = 1658 current_frame->frame_number != 0 && rc->frames_to_key == 0; 1659 rc->frames_to_key = cpi->oxcf.key_freq; 1660 rc->kf_boost = DEFAULT_KF_BOOST; 1661 rc->source_alt_ref_active = 0; 1662 } else { 1663 frame_params->frame_type = INTER_FRAME; 1664 } 1665 if (rc->frames_till_gf_update_due == 0) { 1666 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) 1667 av1_cyclic_refresh_set_golden_update(cpi); 1668 else 1669 rc->baseline_gf_interval = 1670 (rc->min_gf_interval + rc->max_gf_interval) / 2; 1671 rc->frames_till_gf_update_due = rc->baseline_gf_interval; 1672 // NOTE: frames_till_gf_update_due must be <= frames_to_key. 1673 if (rc->frames_till_gf_update_due > rc->frames_to_key) 1674 rc->frames_till_gf_update_due = rc->frames_to_key; 1675 if (*frame_update_type == LF_UPDATE) *frame_update_type = GF_UPDATE; 1676 rc->gfu_boost = DEFAULT_GF_BOOST; 1677 } 1678 1679 // Any update/change of global cyclic refresh parameters (amount/delta-qp) 1680 // should be done here, before the frame qp is selected. 1681 if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) 1682 av1_cyclic_refresh_update_parameters(cpi); 1683 1684 if (frame_params->frame_type == KEY_FRAME) 1685 target = calc_iframe_target_size_one_pass_cbr(cpi); 1686 else 1687 target = calc_pframe_target_size_one_pass_cbr(cpi, *frame_update_type); 1688 1689 rc_set_frame_target(cpi, target, cm->width, cm->height); 1690 // TODO(afergs): Decide whether to scale up, down, or not at all 1691 } 1692 1693 int av1_find_qindex(double desired_q, aom_bit_depth_t bit_depth, 1694 int best_qindex, int worst_qindex) { 1695 assert(best_qindex <= worst_qindex); 1696 int low = best_qindex; 1697 int high = worst_qindex; 1698 while (low < high) { 1699 const int mid = (low + high) >> 1; 1700 const double mid_q = av1_convert_qindex_to_q(mid, bit_depth); 1701 if (mid_q < desired_q) { 1702 low = mid + 1; 1703 } else { 1704 high = mid; 1705 } 1706 } 1707 assert(low == high); 1708 assert(av1_convert_qindex_to_q(low, bit_depth) >= desired_q || 1709 low == worst_qindex); 1710 return low; 1711 } 1712 1713 int av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, 1714 aom_bit_depth_t bit_depth) { 1715 const int start_index = 1716 av1_find_qindex(qstart, bit_depth, rc->best_quality, rc->worst_quality); 1717 const int target_index = 1718 av1_find_qindex(qtarget, bit_depth, rc->best_quality, rc->worst_quality); 1719 return target_index - start_index; 1720 } 1721 1722 // Find q_index for the desired_bits_per_mb, within [best_qindex, worst_qindex], 1723 // assuming 'correction_factor' is 1.0. 1724 // To be precise, 'q_index' is the smallest integer, for which the corresponding 1725 // bits per mb <= desired_bits_per_mb. 1726 // If no such q index is found, returns 'worst_qindex'. 1727 static int find_qindex_by_rate(int desired_bits_per_mb, 1728 aom_bit_depth_t bit_depth, FRAME_TYPE frame_type, 1729 int best_qindex, int worst_qindex) { 1730 assert(best_qindex <= worst_qindex); 1731 int low = best_qindex; 1732 int high = worst_qindex; 1733 while (low < high) { 1734 const int mid = (low + high) >> 1; 1735 const int mid_bits_per_mb = 1736 av1_rc_bits_per_mb(frame_type, mid, 1.0, bit_depth); 1737 if (mid_bits_per_mb > desired_bits_per_mb) { 1738 low = mid + 1; 1739 } else { 1740 high = mid; 1741 } 1742 } 1743 assert(low == high); 1744 assert(av1_rc_bits_per_mb(frame_type, low, 1.0, bit_depth) <= 1745 desired_bits_per_mb || 1746 low == worst_qindex); 1747 return low; 1748 } 1749 1750 int av1_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type, 1751 int qindex, double rate_target_ratio, 1752 aom_bit_depth_t bit_depth) { 1753 // Look up the current projected bits per block for the base index 1754 const int base_bits_per_mb = 1755 av1_rc_bits_per_mb(frame_type, qindex, 1.0, bit_depth); 1756 1757 // Find the target bits per mb based on the base value and given ratio. 1758 const int target_bits_per_mb = (int)(rate_target_ratio * base_bits_per_mb); 1759 1760 const int target_index = 1761 find_qindex_by_rate(target_bits_per_mb, bit_depth, frame_type, 1762 rc->best_quality, rc->worst_quality); 1763 return target_index - qindex; 1764 } 1765 1766 void av1_rc_set_gf_interval_range(const AV1_COMP *const cpi, 1767 RATE_CONTROL *const rc) { 1768 const AV1EncoderConfig *const oxcf = &cpi->oxcf; 1769 1770 // Special case code for 1 pass fixed Q mode tests 1771 if ((oxcf->pass == 0) && (oxcf->rc_mode == AOM_Q)) { 1772 rc->max_gf_interval = FIXED_GF_INTERVAL; 1773 rc->min_gf_interval = FIXED_GF_INTERVAL; 1774 rc->static_scene_max_gf_interval = FIXED_GF_INTERVAL; 1775 } else { 1776 // Set Maximum gf/arf interval 1777 rc->max_gf_interval = oxcf->max_gf_interval; 1778 rc->min_gf_interval = oxcf->min_gf_interval; 1779 if (rc->min_gf_interval == 0) 1780 rc->min_gf_interval = av1_rc_get_default_min_gf_interval( 1781 oxcf->width, oxcf->height, cpi->framerate); 1782 if (rc->max_gf_interval == 0) 1783 rc->max_gf_interval = av1_rc_get_default_max_gf_interval( 1784 cpi->framerate, rc->min_gf_interval); 1785 1786 // Extended max interval for genuinely static scenes like slide shows. 1787 rc->static_scene_max_gf_interval = MAX_STATIC_GF_GROUP_LENGTH; 1788 1789 if (rc->max_gf_interval > rc->static_scene_max_gf_interval) 1790 rc->max_gf_interval = rc->static_scene_max_gf_interval; 1791 1792 // Clamp min to max 1793 rc->min_gf_interval = AOMMIN(rc->min_gf_interval, rc->max_gf_interval); 1794 } 1795 } 1796 1797 void av1_rc_update_framerate(AV1_COMP *cpi, int width, int height) { 1798 const AV1EncoderConfig *const oxcf = &cpi->oxcf; 1799 RATE_CONTROL *const rc = &cpi->rc; 1800 int vbr_max_bits; 1801 const int MBs = av1_get_MBs(width, height); 1802 1803 rc->avg_frame_bandwidth = (int)(oxcf->target_bandwidth / cpi->framerate); 1804 rc->min_frame_bandwidth = 1805 (int)(rc->avg_frame_bandwidth * oxcf->two_pass_vbrmin_section / 100); 1806 1807 rc->min_frame_bandwidth = 1808 AOMMAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS); 1809 1810 // A maximum bitrate for a frame is defined. 1811 // The baseline for this aligns with HW implementations that 1812 // can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits 1813 // per 16x16 MB (averaged over a frame). However this limit is extended if 1814 // a very high rate is given on the command line or the the rate cannnot 1815 // be acheived because of a user specificed max q (e.g. when the user 1816 // specifies lossless encode. 1817 vbr_max_bits = 1818 (int)(((int64_t)rc->avg_frame_bandwidth * oxcf->two_pass_vbrmax_section) / 1819 100); 1820 rc->max_frame_bandwidth = 1821 AOMMAX(AOMMAX((MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits); 1822 1823 av1_rc_set_gf_interval_range(cpi, rc); 1824 } 1825 1826 #define VBR_PCT_ADJUSTMENT_LIMIT 50 1827 // For VBR...adjustment to the frame target based on error from previous frames 1828 static void vbr_rate_correction(AV1_COMP *cpi, int *this_frame_target) { 1829 RATE_CONTROL *const rc = &cpi->rc; 1830 int64_t vbr_bits_off_target = rc->vbr_bits_off_target; 1831 int max_delta; 1832 double position_factor = 1.0; 1833 1834 // How far through the clip are we. 1835 // This number is used to damp the per frame rate correction. 1836 // Range 0 - 1.0 1837 if (cpi->twopass.total_stats.count != 0.) { 1838 position_factor = sqrt((double)cpi->common.current_frame.frame_number / 1839 cpi->twopass.total_stats.count); 1840 } 1841 max_delta = (int)(position_factor * 1842 ((*this_frame_target * VBR_PCT_ADJUSTMENT_LIMIT) / 100)); 1843 1844 // vbr_bits_off_target > 0 means we have extra bits to spend 1845 if (vbr_bits_off_target > 0) { 1846 *this_frame_target += (vbr_bits_off_target > max_delta) 1847 ? max_delta 1848 : (int)vbr_bits_off_target; 1849 } else { 1850 *this_frame_target -= (vbr_bits_off_target < -max_delta) 1851 ? max_delta 1852 : (int)-vbr_bits_off_target; 1853 } 1854 1855 // Fast redistribution of bits arising from massive local undershoot. 1856 // Dont do it for kf,arf,gf or overlay frames. 1857 if (!frame_is_kf_gf_arf(cpi) && !rc->is_src_frame_alt_ref && 1858 rc->vbr_bits_off_target_fast) { 1859 int one_frame_bits = AOMMAX(rc->avg_frame_bandwidth, *this_frame_target); 1860 int fast_extra_bits; 1861 fast_extra_bits = (int)AOMMIN(rc->vbr_bits_off_target_fast, one_frame_bits); 1862 fast_extra_bits = (int)AOMMIN( 1863 fast_extra_bits, 1864 AOMMAX(one_frame_bits / 8, rc->vbr_bits_off_target_fast / 8)); 1865 *this_frame_target += (int)fast_extra_bits; 1866 rc->vbr_bits_off_target_fast -= fast_extra_bits; 1867 } 1868 } 1869 1870 void av1_set_target_rate(AV1_COMP *cpi, int width, int height) { 1871 RATE_CONTROL *const rc = &cpi->rc; 1872 int target_rate = rc->base_frame_target; 1873 1874 // Correction to rate target based on prior over or under shoot. 1875 if (cpi->oxcf.rc_mode == AOM_VBR || cpi->oxcf.rc_mode == AOM_CQ) 1876 vbr_rate_correction(cpi, &target_rate); 1877 rc_set_frame_target(cpi, target_rate, width, height); 1878 } 1879
