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 #ifndef AOM_AV1_ENCODER_RATECTRL_H_ 13 #define AOM_AV1_ENCODER_RATECTRL_H_ 14 15 #include "aom/aom_codec.h" 16 #include "aom/aom_integer.h" 17 18 #include "aom_ports/mem.h" 19 20 #include "av1/common/av1_common_int.h" 21 #include "av1/common/blockd.h" 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 /*!\cond */ 28 29 // Bits Per MB at different Q (Multiplied by 512) 30 #define BPER_MB_NORMBITS 9 31 32 // Use this macro to turn on/off use of alt-refs in one-pass mode. 33 #define USE_ALTREF_FOR_ONE_PASS 1 34 35 // Threshold used to define if a KF group is static (e.g. a slide show). 36 // Essentially, this means that no frame in the group has more than 1% of MBs 37 // that are not marked as coded with 0,0 motion in the first pass. 38 #define STATIC_KF_GROUP_THRESH 99 39 #define STATIC_KF_GROUP_FLOAT_THRESH 0.99 40 41 // The maximum duration of a GF group that is static (e.g. a slide show). 42 #define MAX_STATIC_GF_GROUP_LENGTH 250 43 44 #define MIN_GF_INTERVAL 4 45 #define MAX_GF_INTERVAL 32 46 #define FIXED_GF_INTERVAL 16 47 #define MAX_GF_LENGTH_LAP 16 48 49 #define FIXED_GF_INTERVAL_RT 80 50 #define MAX_GF_INTERVAL_RT 160 51 52 #define MAX_NUM_GF_INTERVALS 15 53 54 #define MAX_ARF_LAYERS 6 55 // #define STRICT_RC 56 57 #define DEFAULT_KF_BOOST_RT 2300 58 #define DEFAULT_GF_BOOST_RT 2000 59 60 // A passive rate control strategy for screen content type in real-time mode. 61 // When it is turned on, the compression performance is improved by 62 // 7.8% (overall_psnr), 5.0% (VMAF) on average. Some clips see gains 63 // over 20% on metric. 64 // The downside is that it does not guarantee frame size. 65 // Since RT mode has a tight restriction on buffer overflow control, we 66 // turn it off by default. 67 #define RT_PASSIVE_STRATEGY 0 68 #define MAX_Q_HISTORY 1000 69 70 typedef struct { 71 int resize_width; 72 int resize_height; 73 uint8_t superres_denom; 74 } size_params_type; 75 76 enum { 77 INTER_NORMAL, 78 GF_ARF_LOW, 79 GF_ARF_STD, 80 KF_STD, 81 RATE_FACTOR_LEVELS 82 } UENUM1BYTE(RATE_FACTOR_LEVEL); 83 84 enum { 85 KF_UPDATE, 86 LF_UPDATE, 87 GF_UPDATE, 88 ARF_UPDATE, 89 OVERLAY_UPDATE, 90 INTNL_OVERLAY_UPDATE, // Internal Overlay Frame 91 INTNL_ARF_UPDATE, // Internal Altref Frame 92 FRAME_UPDATE_TYPES 93 } UENUM1BYTE(FRAME_UPDATE_TYPE); 94 95 enum { 96 REFBUF_RESET, // Clear reference frame buffer 97 REFBUF_UPDATE, // Refresh reference frame buffer 98 REFBUF_STATES 99 } UENUM1BYTE(REFBUF_STATE); 100 101 typedef enum { 102 NO_RESIZE = 0, 103 DOWN_THREEFOUR = 1, // From orig to 3/4. 104 DOWN_ONEHALF = 2, // From orig or 3/4 to 1/2. 105 UP_THREEFOUR = -1, // From 1/2 to 3/4. 106 UP_ORIG = -2, // From 1/2 or 3/4 to orig. 107 } RESIZE_ACTION; 108 109 typedef enum { ORIG = 0, THREE_QUARTER = 1, ONE_HALF = 2 } RESIZE_STATE; 110 111 #define MAX_FIRSTPASS_ANALYSIS_FRAMES 150 112 typedef enum region_types { 113 STABLE_REGION = 0, 114 HIGH_VAR_REGION = 1, 115 SCENECUT_REGION = 2, 116 BLENDING_REGION = 3, 117 } REGION_TYPES; 118 119 typedef struct regions { 120 int start; 121 int last; 122 double avg_noise_var; 123 double avg_cor_coeff; 124 double avg_sr_fr_ratio; 125 double avg_intra_err; 126 double avg_coded_err; 127 REGION_TYPES type; 128 } REGIONS; 129 130 /*!\endcond */ 131 /*! 132 * \brief Rate Control parameters and status 133 */ 134 typedef struct { 135 // Rate targetting variables 136 137 /*! 138 * Baseline target rate for frame before adjustment for previous under or 139 * over shoot. 140 */ 141 int base_frame_target; 142 /*! 143 * Target rate for frame after adjustment for previous under or over shoot. 144 */ 145 int this_frame_target; // Actual frame target after rc adjustment. 146 147 /*! 148 * Projected size for current frame 149 */ 150 int projected_frame_size; 151 152 /*! 153 * Bit size of transform coefficient for current frame. 154 */ 155 int coefficient_size; 156 157 /*! 158 * Super block rate target used with some adaptive quantization strategies. 159 */ 160 int sb64_target_rate; 161 162 /*! 163 * Number of frames since the last ARF / GF. 164 */ 165 int frames_since_golden; 166 167 /*! 168 * Number of frames till the next ARF / GF is due. 169 */ 170 int frames_till_gf_update_due; 171 172 /*! 173 * Number of determined gf groups left 174 */ 175 int intervals_till_gf_calculate_due; 176 177 /*!\cond */ 178 int min_gf_interval; 179 int max_gf_interval; 180 int static_scene_max_gf_interval; 181 /*!\endcond */ 182 /*! 183 * Frames before the next key frame 184 */ 185 int frames_to_key; 186 /*!\cond */ 187 int frames_since_key; 188 int frames_to_fwd_kf; 189 int is_src_frame_alt_ref; 190 int sframe_due; 191 192 int high_source_sad; 193 uint64_t avg_source_sad; 194 uint64_t prev_avg_source_sad; 195 uint64_t frame_source_sad; 196 197 int avg_frame_bandwidth; // Average frame size target for clip 198 int min_frame_bandwidth; // Minimum allocation used for any frame 199 int max_frame_bandwidth; // Maximum burst rate allowed for a frame. 200 int prev_avg_frame_bandwidth; 201 202 int ni_av_qi; 203 int ni_tot_qi; 204 205 int decimation_factor; 206 int decimation_count; 207 int prev_frame_is_dropped; 208 int drop_count_consec; 209 int max_consec_drop; 210 211 /*! 212 * Frame number for encoded frames (non-dropped). 213 * Use for setting the rtc reference structure. 214 */ 215 unsigned int frame_number_encoded; 216 217 /*!\endcond */ 218 /*! 219 * User specified maximum Q allowed for current frame 220 */ 221 int worst_quality; 222 /*! 223 * User specified minimum Q allowed for current frame 224 */ 225 int best_quality; 226 227 /*!\cond */ 228 229 // rate control history for last frame(1) and the frame before(2). 230 // -1: overshoot 231 // 1: undershoot 232 // 0: not initialized. 233 int rc_1_frame; 234 int rc_2_frame; 235 int q_1_frame; 236 int q_2_frame; 237 238 /*!\endcond */ 239 /*! 240 * Proposed maximum allowed Q for current frame 241 */ 242 int active_worst_quality; 243 244 /*!\cond */ 245 // Track amount of low motion in scene 246 int avg_frame_low_motion; 247 int cnt_zeromv; 248 249 // signals if number of blocks with motion is high 250 int percent_blocks_with_motion; 251 252 // signals percentge of 16x16 blocks that are inactive, via active_maps 253 int percent_blocks_inactive; 254 255 // Maximum value of source sad across all blocks of frame. 256 uint64_t max_block_source_sad; 257 258 // For dynamic resize, 1 pass cbr. 259 RESIZE_STATE resize_state; 260 int resize_avg_qp; 261 int resize_buffer_underflow; 262 int resize_count; 263 264 // Flag to disable content related qp adjustment. 265 int rtc_external_ratectrl; 266 267 // Stores fast_extra_bits of the current frame. 268 int frame_level_fast_extra_bits; 269 270 double frame_level_rate_correction_factors[RATE_FACTOR_LEVELS]; 271 272 int frame_num_last_gf_refresh; 273 274 int prev_coded_width; 275 int prev_coded_height; 276 277 // The ratio used for inter frames in bit estimation. 278 // TODO(yunqing): if golden frame is treated differently (e.g. gf_cbr_boost_ 279 // pct > THR), consider to add bit_est_ratio_g for golden frames. 280 int bit_est_ratio; 281 282 // Whether to use a fixed qp for the frame, bypassing internal rate control. 283 // This flag will reset to 0 after every frame. 284 int use_external_qp_one_pass; 285 /*!\endcond */ 286 } RATE_CONTROL; 287 288 /*! 289 * \brief Primary Rate Control parameters and status 290 */ 291 typedef struct { 292 // Sub-gop level Rate targetting variables 293 294 /*! 295 * Target bit budget for the current GF / ARF group of frame. 296 */ 297 int64_t gf_group_bits; 298 299 /*! 300 * Boost factor used to calculate the extra bits allocated to the key frame 301 */ 302 int kf_boost; 303 304 /*! 305 * Boost factor used to calculate the extra bits allocated to ARFs and GFs 306 */ 307 int gfu_boost; 308 309 /*! 310 * Stores the determined gf group lengths for a set of gf groups 311 */ 312 int gf_intervals[MAX_NUM_GF_INTERVALS]; 313 314 /*! 315 * The current group's index into gf_intervals[] 316 */ 317 int cur_gf_index; 318 319 /*!\cond */ 320 int num_regions; 321 322 REGIONS regions[MAX_FIRSTPASS_ANALYSIS_FRAMES]; 323 int regions_offset; // offset of regions from the last keyframe 324 int frames_till_regions_update; 325 326 int baseline_gf_interval; 327 328 int constrained_gf_group; 329 330 int this_key_frame_forced; 331 332 int next_key_frame_forced; 333 /*!\endcond */ 334 335 /*! 336 * Initial buffuer level in ms for CBR / low delay encoding 337 */ 338 int64_t starting_buffer_level; 339 340 /*! 341 * Optimum / target buffuer level in ms for CBR / low delay encoding 342 */ 343 int64_t optimal_buffer_level; 344 345 /*! 346 * Maximum target buffuer level in ms for CBR / low delay encoding 347 */ 348 int64_t maximum_buffer_size; 349 350 /*! 351 * Q index used for ALT frame 352 */ 353 int arf_q; 354 355 /*!\cond */ 356 float_t arf_boost_factor; 357 358 int base_layer_qp; 359 360 // Total number of stats used only for kf_boost calculation. 361 int num_stats_used_for_kf_boost; 362 363 // Total number of stats used only for gfu_boost calculation. 364 int num_stats_used_for_gfu_boost; 365 366 // Total number of stats required by gfu_boost calculation. 367 int num_stats_required_for_gfu_boost; 368 369 int enable_scenecut_detection; 370 371 int use_arf_in_this_kf_group; 372 373 int ni_frames; 374 375 double tot_q; 376 /*!\endcond */ 377 378 /*! 379 * Q used for last boosted (non leaf) frame 380 */ 381 int last_kf_qindex; 382 383 /*! 384 * Average of q index of previous encoded frames in a sequence. 385 */ 386 int avg_frame_qindex[FRAME_TYPES]; 387 388 #if CONFIG_FPMT_TEST 389 /*! 390 * Temporary variable used in simulating the delayed update of 391 * active_best_quality. 392 */ 393 int temp_active_best_quality[MAX_ARF_LAYERS + 1]; 394 395 /*! 396 * Temporary variable used in simulating the delayed update of 397 * last_boosted_qindex. 398 */ 399 int temp_last_boosted_qindex; 400 401 /*! 402 * Temporary variable used in simulating the delayed update of 403 * avg_q. 404 */ 405 double temp_avg_q; 406 407 /*! 408 * Temporary variable used in simulating the delayed update of 409 * last_q. 410 */ 411 int temp_last_q[FRAME_TYPES]; 412 413 /*! 414 * Temporary variable used in simulating the delayed update of 415 * projected_frame_size. 416 */ 417 int temp_projected_frame_size; 418 419 /*! 420 * Temporary variable used in simulating the delayed update of 421 * total_actual_bits. 422 */ 423 int64_t temp_total_actual_bits; 424 425 /*! 426 * Temporary variable used in simulating the delayed update of 427 * buffer_level. 428 */ 429 int64_t temp_buffer_level; 430 431 /*! 432 * Temporary variable used in simulating the delayed update of 433 * vbr_bits_off_target. 434 */ 435 int64_t temp_vbr_bits_off_target; 436 437 /*! 438 * Temporary variable used in simulating the delayed update of 439 * vbr_bits_off_target_fast. 440 */ 441 int64_t temp_vbr_bits_off_target_fast; 442 443 /*! 444 * Temporary variable used in simulating the delayed update of 445 * rate_correction_factors. 446 */ 447 double temp_rate_correction_factors[RATE_FACTOR_LEVELS]; 448 449 /*! 450 * Temporary variable used in simulating the delayed update of 451 * rate_error_estimate. 452 */ 453 int temp_rate_error_estimate; 454 455 /*! 456 * Temporary variable used in simulating the delayed update of 457 * rolling_arf_group_target_bits. 458 */ 459 int temp_rolling_arf_group_target_bits; 460 461 /*! 462 * Temporary variable used in simulating the delayed update of 463 * rolling_arf_group_actual_bits;. 464 */ 465 int temp_rolling_arf_group_actual_bits; 466 467 /*! 468 * Temporary variable used in simulating the delayed update of 469 * bits_left;. 470 */ 471 int64_t temp_bits_left; 472 473 /*! 474 * Temporary variable used in simulating the delayed update of 475 * extend_minq. 476 */ 477 int temp_extend_minq; 478 479 /*! 480 * Temporary variable used in simulating the delayed update of 481 * extend_maxq. 482 */ 483 int temp_extend_maxq; 484 485 #endif 486 /*! 487 * Proposed minimum allowed Q different layers in a coding pyramid 488 */ 489 int active_best_quality[MAX_ARF_LAYERS + 1]; 490 491 /*! 492 * Q used for last boosted (non leaf) frame (GF/KF/ARF) 493 */ 494 int last_boosted_qindex; 495 496 /*! 497 * Average Q value of previous inter frames 498 */ 499 double avg_q; 500 501 /*! 502 * Q used on last encoded frame of the given type. 503 */ 504 int last_q[FRAME_TYPES]; 505 506 /*! 507 * Correction factors used to adjust the q estimate for a given target rate 508 * in the encode loop. 509 */ 510 double rate_correction_factors[RATE_FACTOR_LEVELS]; 511 512 /*! 513 * Current total consumed bits. 514 */ 515 int64_t total_actual_bits; 516 517 /*! 518 * Current total target bits. 519 */ 520 int64_t total_target_bits; 521 522 /*! 523 * Current buffer level. 524 */ 525 int64_t buffer_level; 526 527 /*! 528 * PCT rc error. 529 */ 530 int rate_error_estimate; 531 532 /*! 533 * Error bits available from previously encoded frames. 534 */ 535 int64_t vbr_bits_off_target; 536 537 /*! 538 * Error bits available from previously encoded frames undershoot. 539 */ 540 int64_t vbr_bits_off_target_fast; 541 542 /*! 543 * Total bits deviated from the average frame target, from previously 544 * encoded frames. 545 */ 546 int64_t bits_off_target; 547 548 /*! 549 * Rolling monitor target bits updated based on current frame target size. 550 */ 551 int rolling_target_bits; 552 553 /*! 554 * Rolling monitor actual bits updated based on current frame final projected 555 * size. 556 */ 557 int rolling_actual_bits; 558 559 /*! 560 * The history of qindex for each frame. 561 * Only used when RT_PASSIVE_STRATEGY = 1. 562 */ 563 int q_history[MAX_Q_HISTORY]; 564 } PRIMARY_RATE_CONTROL; 565 566 /*!\cond */ 567 568 struct AV1_COMP; 569 struct AV1EncoderConfig; 570 struct GF_GROUP; 571 572 void av1_primary_rc_init(const struct AV1EncoderConfig *oxcf, 573 PRIMARY_RATE_CONTROL *p_rc); 574 575 void av1_rc_init(const struct AV1EncoderConfig *oxcf, RATE_CONTROL *rc); 576 577 int av1_estimate_bits_at_q(const struct AV1_COMP *cpi, int q, 578 double correction_factor); 579 580 double av1_convert_qindex_to_q(int qindex, aom_bit_depth_t bit_depth); 581 582 void av1_rc_init_minq_luts(void); 583 584 int av1_rc_get_default_min_gf_interval(int width, int height, double framerate); 585 // Note av1_rc_get_default_max_gf_interval() requires the min_gf_interval to 586 // be passed in to ensure that the max_gf_interval returned is at least as bis 587 // as that. 588 int av1_rc_get_default_max_gf_interval(double framerate, int min_gf_interval); 589 590 // Generally at the high level, the following flow is expected 591 // to be enforced for rate control: 592 // First call per frame, one of: 593 // av1_get_one_pass_rt_params() 594 // av1_get_second_pass_params() 595 // depending on the usage to set the rate control encode parameters desired. 596 // 597 // Then, call encode_frame_to_data_rate() to perform the 598 // actual encode. This function will in turn call encode_frame() 599 // one or more times, followed by: 600 // av1_rc_postencode_update_drop_frame() 601 // 602 // The majority of rate control parameters are only expected 603 // to be set in the av1_get_..._params() functions and 604 // updated during the av1_rc_postencode_update...() functions. 605 // The only exceptions are av1_rc_drop_frame() and 606 // av1_rc_update_rate_correction_factors() functions. 607 608 // Functions to set parameters for encoding before the actual 609 // encode_frame_to_data_rate() function. 610 struct EncodeFrameInput; 611 612 // Post encode update of the rate control parameters based 613 // on bytes used 614 void av1_rc_postencode_update(struct AV1_COMP *cpi, uint64_t bytes_used); 615 // Post encode update of the rate control parameters for dropped frames 616 void av1_rc_postencode_update_drop_frame(struct AV1_COMP *cpi); 617 618 /*!\endcond */ 619 /*!\brief Updates the rate correction factor linking Q to output bits 620 * 621 * This function updates the Q rate correction factor after an encode 622 * cycle depending on whether we overshot or undershot the target rate. 623 * 624 * \ingroup rate_control 625 * \param[in] cpi Top level encoder instance structure 626 * \param[in] is_encode_stage Indicates if recode loop or post-encode 627 * \param[in] width Frame width 628 * \param[in] height Frame height 629 * 630 * \remark Updates the relevant rate correction factor in cpi->rc 631 */ 632 void av1_rc_update_rate_correction_factors(struct AV1_COMP *cpi, 633 int is_encode_stage, int width, 634 int height); 635 /*!\cond */ 636 637 // Decide if we should drop this frame: For 1-pass CBR. 638 // Changes only the decimation count in the rate control structure 639 int av1_rc_drop_frame(struct AV1_COMP *cpi); 640 641 // Computes frame size bounds. 642 void av1_rc_compute_frame_size_bounds(const struct AV1_COMP *cpi, 643 int this_frame_target, 644 int *frame_under_shoot_limit, 645 int *frame_over_shoot_limit); 646 647 /*!\endcond */ 648 649 /*!\brief Picks q and q bounds given the rate control parameters in \c cpi->rc. 650 * 651 * \ingroup rate_control 652 * \param[in] cpi Top level encoder structure 653 * \param[in] width Coded frame width 654 * \param[in] height Coded frame height 655 * \param[in] gf_index Index of this frame in the golden frame group 656 * \param[out] bottom_index Bottom bound for q index (best quality) 657 * \param[out] top_index Top bound for q index (worst quality) 658 * \return Returns selected q index to be used for encoding this frame. 659 * Also, updates \c rc->arf_q. 660 */ 661 int av1_rc_pick_q_and_bounds(struct AV1_COMP *cpi, int width, int height, 662 int gf_index, int *bottom_index, int *top_index); 663 664 /*!\brief Estimates q to achieve a target bits per frame 665 * 666 * \ingroup rate_control 667 * \param[in] cpi Top level encoder instance structure 668 * \param[in] target_bits_per_frame Frame rate target 669 * \param[in] active_worst_quality Max Q allowed 670 * \param[in] active_best_quality Min Q allowed 671 * \param[in] width Frame width 672 * \param[in] height Frame height 673 * 674 * \return Returns a q index value 675 */ 676 int av1_rc_regulate_q(const struct AV1_COMP *cpi, int target_bits_per_frame, 677 int active_best_quality, int active_worst_quality, 678 int width, int height); 679 680 /*!\cond */ 681 // Gets the appropriate bpmb ennumerator based on the frame and content type 682 int av1_get_bpmb_enumerator(FRAME_TYPE frame_type, 683 const int is_screen_content_type); 684 685 // Estimates bits per mb for a given qindex and correction factor. 686 int av1_rc_bits_per_mb(const struct AV1_COMP *cpi, FRAME_TYPE frame_type, 687 int qindex, double correction_factor, 688 int accurate_estimate); 689 690 // Clamping utilities for bitrate targets for iframes and pframes. 691 int av1_rc_clamp_iframe_target_size(const struct AV1_COMP *const cpi, 692 int64_t target); 693 int av1_rc_clamp_pframe_target_size(const struct AV1_COMP *const cpi, 694 int target, uint8_t frame_update_type); 695 696 // Find q_index corresponding to desired_q, within [best_qindex, worst_qindex]. 697 // To be precise, 'q_index' is the smallest integer, for which the corresponding 698 // q >= desired_q. 699 // If no such q index is found, returns 'worst_qindex'. 700 int av1_find_qindex(double desired_q, aom_bit_depth_t bit_depth, 701 int best_qindex, int worst_qindex); 702 703 // Computes a q delta (in "q index" terms) to get from a starting q value 704 // to a target q value 705 int av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, 706 aom_bit_depth_t bit_depth); 707 708 // Computes a q delta (in "q index" terms) to get from a starting q value 709 // to a value that should equate to the given rate ratio. 710 int av1_compute_qdelta_by_rate(const struct AV1_COMP *cpi, 711 FRAME_TYPE frame_type, int qindex, 712 double rate_target_ratio); 713 714 int av1_frame_type_qdelta(const struct AV1_COMP *cpi, int q); 715 716 void av1_rc_update_framerate(struct AV1_COMP *cpi, int width, int height); 717 718 void av1_rc_set_gf_interval_range(const struct AV1_COMP *const cpi, 719 RATE_CONTROL *const rc); 720 721 void av1_set_target_rate(struct AV1_COMP *cpi, int width, int height); 722 723 int av1_resize_one_pass_cbr(struct AV1_COMP *cpi); 724 725 void av1_rc_set_frame_target(struct AV1_COMP *cpi, int target, int width, 726 int height); 727 728 void av1_adjust_gf_refresh_qp_one_pass_rt(struct AV1_COMP *cpi); 729 730 void av1_set_rtc_reference_structure_one_layer(struct AV1_COMP *cpi, 731 int gf_update); 732 733 /*!\endcond */ 734 /*!\brief Calculates how many bits to use for a P frame in one pass vbr 735 * 736 * \ingroup rate_control 737 * \callgraph 738 * \callergraph 739 * 740 * \param[in] cpi Top level encoder structure 741 * \param[in] frame_update_type Type of frame 742 * 743 * \return Returns the target number of bits for this frame. 744 */ 745 int av1_calc_pframe_target_size_one_pass_vbr( 746 const struct AV1_COMP *const cpi, FRAME_UPDATE_TYPE frame_update_type); 747 748 /*!\brief Calculates how many bits to use for an i frame in one pass vbr 749 * 750 * \ingroup rate_control 751 * \callgraph 752 * \callergraph 753 * 754 * \param[in] cpi Top level encoder structure 755 * 756 * \return Returns the target number of bits for this frame. 757 */ 758 int av1_calc_iframe_target_size_one_pass_vbr(const struct AV1_COMP *const cpi); 759 760 /*!\brief Calculates how many bits to use for a P frame in one pass cbr 761 * 762 * \ingroup rate_control 763 * \callgraph 764 * \callergraph 765 * 766 * \param[in] cpi Top level encoder structure 767 * \param[in] frame_update_type Type of frame 768 * 769 * \return Returns the target number of bits for this frame. 770 */ 771 int av1_calc_pframe_target_size_one_pass_cbr( 772 const struct AV1_COMP *cpi, FRAME_UPDATE_TYPE frame_update_type); 773 774 /*!\brief Calculates how many bits to use for an i frame in one pass cbr 775 * 776 * \ingroup rate_control 777 * \callgraph 778 * \callergraph 779 * 780 * \param[in] cpi Top level encoder structure 781 * 782 * \return Returns the target number of bits for this frame. 783 */ 784 int av1_calc_iframe_target_size_one_pass_cbr(const struct AV1_COMP *cpi); 785 786 /*!\brief Setup the rate control parameters for 1 pass real-time mode. 787 * 788 * - Sets the frame type and target frame size. 789 * - Sets the GF update. 790 * - Checks for scene change. 791 * - Sets the reference prediction structure for 1 layers (non-SVC). 792 * - Resets and updates are done for SVC. 793 * 794 * \ingroup rate_control 795 * \param[in] cpi Top level encoder structure 796 * \param[in] frame_type Encoder frame type 797 * \param[in] frame_input Current and last input source frames 798 * \param[in] frame_flags Encoder frame flags 799 * 800 * \remark Nothing is returned. Instead the settings computed in this 801 * function are set in: \c frame_params, \c cpi->common, \c cpi->rc, 802 * \c cpi->svc. 803 */ 804 void av1_get_one_pass_rt_params(struct AV1_COMP *cpi, 805 FRAME_TYPE *const frame_type, 806 const struct EncodeFrameInput *frame_input, 807 unsigned int frame_flags); 808 809 /*!\brief Increase q on expected encoder overshoot, for CBR mode. 810 * 811 * Handles the case when encoder is expected to create a large frame: 812 * - q is increased to value closer to \c cpi->rc.worst_quality 813 * - avg_frame_qindex is reset 814 * - buffer levels are reset 815 * - rate correction factor is adjusted 816 * 817 * \ingroup rate_control 818 * \param[in] cpi Top level encoder structure 819 * \param[in] q Current q index 820 * 821 * \return q is returned, and updates are done to \c cpi->rc. 822 */ 823 int av1_encodedframe_overshoot_cbr(struct AV1_COMP *cpi, int *q); 824 825 /*!\brief Compute the q_indices for a single frame. 826 * 827 * Intended to be used with AOM_Q mode. 828 * 829 * \param[in] base_q_index Base q index 830 * \param[in] gf_update_type GOP update type 831 * \param[in] gf_pyramid_level GOP level of the current frame 832 * \param[in] arf_q ARF q_index 833 * 834 * \return Returns the q_index for the current frame. 835 */ 836 int av1_q_mode_get_q_index(int base_q_index, int gf_update_type, 837 int gf_pyramid_level, int arf_q); 838 839 /*!\brief Compute the q_indices for the ARF of a GOP. 840 * 841 * \param[in] base_q_index Base q index 842 * \param[in] gfu_boost GFU boost 843 * \param[in] bit_depth Bit depth 844 * \param[in] arf_boost_factor ARF boost factor 845 * 846 * \return Returns the q_index for the ARF frame. 847 */ 848 int av1_get_arf_q_index(int base_q_index, int gfu_boost, int bit_depth, 849 double arf_boost_factor); 850 851 #if !CONFIG_REALTIME_ONLY 852 struct TplDepFrame; 853 /*!\brief Compute the q_indices for the ARF of a GOP in Q mode. 854 * 855 * \param[in] cpi Top level encoder structure 856 * \param[in] tpl_frame Tpl Frame stats 857 * 858 * \return Returns the q_index for the ARF frame. 859 */ 860 int av1_get_arf_q_index_q_mode(struct AV1_COMP *cpi, 861 struct TplDepFrame *tpl_frame); 862 #endif 863 #ifdef __cplusplus 864 } // extern "C" 865 #endif 866 867 #endif // AOM_AV1_ENCODER_RATECTRL_H_ 868