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 int high_motion_content_screen_rtc; 194 uint64_t avg_source_sad; 195 uint64_t prev_avg_source_sad; 196 uint64_t frame_source_sad; 197 uint64_t frame_spatial_variance; 198 int static_since_last_scene_change; 199 int last_encoded_size_keyframe; 200 int last_target_size_keyframe; 201 int frames_since_scene_change; 202 int perc_flat_blocks_keyframe; 203 204 int avg_frame_bandwidth; // Average frame size target for clip 205 int min_frame_bandwidth; // Minimum allocation used for any frame 206 int max_frame_bandwidth; // Maximum burst rate allowed for a frame. 207 int prev_avg_frame_bandwidth; 208 209 int ni_av_qi; 210 int ni_tot_qi; 211 212 int decimation_factor; 213 int decimation_count; 214 int prev_frame_is_dropped; 215 int drop_count_consec; 216 int max_consec_drop; 217 int force_max_q; 218 int postencode_drop; 219 220 /*! 221 * Frame number for encoded frames (non-dropped). 222 * Use for setting the rtc reference structure. 223 */ 224 unsigned int frame_number_encoded; 225 226 /*!\endcond */ 227 /*! 228 * User specified maximum Q allowed for current frame 229 */ 230 int worst_quality; 231 /*! 232 * User specified minimum Q allowed for current frame 233 */ 234 int best_quality; 235 236 /*!\cond */ 237 238 // rate control history for last frame(1) and the frame before(2). 239 // -1: overshoot 240 // 1: undershoot 241 // 0: not initialized. 242 int rc_1_frame; 243 int rc_2_frame; 244 int q_1_frame; 245 int q_2_frame; 246 247 /*!\endcond */ 248 /*! 249 * Proposed maximum allowed Q for current frame 250 */ 251 int active_worst_quality; 252 253 /*!\cond */ 254 // Track amount of low motion in scene 255 int avg_frame_low_motion; 256 int cnt_zeromv; 257 258 // signals if number of blocks with motion is high 259 int percent_blocks_with_motion; 260 261 // signals percentage of 16x16 blocks that are inactive, via active_maps 262 int percent_blocks_inactive; 263 264 // Maximum value of source sad across all blocks of frame. 265 uint64_t max_block_source_sad; 266 267 // For dynamic resize, 1 pass cbr. 268 RESIZE_STATE resize_state; 269 int resize_avg_qp; 270 int resize_buffer_underflow; 271 int resize_count; 272 273 // Flag to disable content related qp adjustment. 274 int rtc_external_ratectrl; 275 276 // Stores fast_extra_bits of the current frame. 277 int frame_level_fast_extra_bits; 278 279 double frame_level_rate_correction_factors[RATE_FACTOR_LEVELS]; 280 281 int frame_num_last_gf_refresh; 282 283 int prev_coded_width; 284 int prev_coded_height; 285 286 // The ratio used for inter frames in bit estimation. 287 // TODO(yunqing): if golden frame is treated differently (e.g. gf_cbr_boost_ 288 // pct > THR), consider to add bit_est_ratio_g for golden frames. 289 int bit_est_ratio; 290 291 // Whether to use a fixed qp for the frame, bypassing internal rate control. 292 // This flag will reset to 0 after every frame. 293 int use_external_qp_one_pass; 294 /*!\endcond */ 295 } RATE_CONTROL; 296 297 /*! 298 * \brief Primary Rate Control parameters and status 299 */ 300 typedef struct { 301 // Sub-gop level Rate targetting variables 302 303 /*! 304 * Target bit budget for the current GF / ARF group of frame. 305 */ 306 int64_t gf_group_bits; 307 308 /*! 309 * Boost factor used to calculate the extra bits allocated to the key frame 310 */ 311 int kf_boost; 312 313 /*! 314 * Boost factor used to calculate the extra bits allocated to ARFs and GFs 315 */ 316 int gfu_boost; 317 318 /*! 319 * Stores the determined gf group lengths for a set of gf groups 320 */ 321 int gf_intervals[MAX_NUM_GF_INTERVALS]; 322 323 /*! 324 * The current group's index into gf_intervals[] 325 */ 326 int cur_gf_index; 327 328 /*!\cond */ 329 int num_regions; 330 331 REGIONS regions[MAX_FIRSTPASS_ANALYSIS_FRAMES]; 332 int regions_offset; // offset of regions from the last keyframe 333 int frames_till_regions_update; 334 335 int baseline_gf_interval; 336 337 int constrained_gf_group; 338 339 int this_key_frame_forced; 340 341 int next_key_frame_forced; 342 /*!\endcond */ 343 344 /*! 345 * Initial buffuer level in ms for CBR / low delay encoding 346 */ 347 int64_t starting_buffer_level; 348 349 /*! 350 * Optimum / target buffuer level in ms for CBR / low delay encoding 351 */ 352 int64_t optimal_buffer_level; 353 354 /*! 355 * Maximum target buffuer level in ms for CBR / low delay encoding 356 */ 357 int64_t maximum_buffer_size; 358 359 /*! 360 * Q index used for ALT frame 361 */ 362 int arf_q; 363 364 /*!\cond */ 365 float_t arf_boost_factor; 366 367 int base_layer_qp; 368 369 // Total number of stats used only for kf_boost calculation. 370 int num_stats_used_for_kf_boost; 371 372 // Total number of stats used only for gfu_boost calculation. 373 int num_stats_used_for_gfu_boost; 374 375 // Total number of stats required by gfu_boost calculation. 376 int num_stats_required_for_gfu_boost; 377 378 int enable_scenecut_detection; 379 380 int use_arf_in_this_kf_group; 381 382 int ni_frames; 383 384 double tot_q; 385 /*!\endcond */ 386 387 /*! 388 * Q used for last boosted (non leaf) frame 389 */ 390 int last_kf_qindex; 391 392 /*! 393 * Average of q index of previous encoded frames in a sequence. 394 */ 395 int avg_frame_qindex[FRAME_TYPES]; 396 397 #if CONFIG_FPMT_TEST 398 /*! 399 * Temporary variable used in simulating the delayed update of 400 * active_best_quality. 401 */ 402 int temp_active_best_quality[MAX_ARF_LAYERS + 1]; 403 404 /*! 405 * Temporary variable used in simulating the delayed update of 406 * last_boosted_qindex. 407 */ 408 int temp_last_boosted_qindex; 409 410 /*! 411 * Temporary variable used in simulating the delayed update of 412 * avg_q. 413 */ 414 double temp_avg_q; 415 416 /*! 417 * Temporary variable used in simulating the delayed update of 418 * last_q. 419 */ 420 int temp_last_q[FRAME_TYPES]; 421 422 /*! 423 * Temporary variable used in simulating the delayed update of 424 * projected_frame_size. 425 */ 426 int temp_projected_frame_size; 427 428 /*! 429 * Temporary variable used in simulating the delayed update of 430 * total_actual_bits. 431 */ 432 int64_t temp_total_actual_bits; 433 434 /*! 435 * Temporary variable used in simulating the delayed update of 436 * buffer_level. 437 */ 438 int64_t temp_buffer_level; 439 440 /*! 441 * Temporary variable used in simulating the delayed update of 442 * vbr_bits_off_target. 443 */ 444 int64_t temp_vbr_bits_off_target; 445 446 /*! 447 * Temporary variable used in simulating the delayed update of 448 * vbr_bits_off_target_fast. 449 */ 450 int64_t temp_vbr_bits_off_target_fast; 451 452 /*! 453 * Temporary variable used in simulating the delayed update of 454 * rate_correction_factors. 455 */ 456 double temp_rate_correction_factors[RATE_FACTOR_LEVELS]; 457 458 /*! 459 * Temporary variable used in simulating the delayed update of 460 * rate_error_estimate. 461 */ 462 int temp_rate_error_estimate; 463 464 /*! 465 * Temporary variable used in simulating the delayed update of 466 * rolling_arf_group_target_bits. 467 */ 468 int temp_rolling_arf_group_target_bits; 469 470 /*! 471 * Temporary variable used in simulating the delayed update of 472 * rolling_arf_group_actual_bits;. 473 */ 474 int temp_rolling_arf_group_actual_bits; 475 476 /*! 477 * Temporary variable used in simulating the delayed update of 478 * bits_left;. 479 */ 480 int64_t temp_bits_left; 481 482 /*! 483 * Temporary variable used in simulating the delayed update of 484 * extend_minq. 485 */ 486 int temp_extend_minq; 487 488 /*! 489 * Temporary variable used in simulating the delayed update of 490 * extend_maxq. 491 */ 492 int temp_extend_maxq; 493 494 #endif 495 /*! 496 * Proposed minimum allowed Q different layers in a coding pyramid 497 */ 498 int active_best_quality[MAX_ARF_LAYERS + 1]; 499 500 /*! 501 * Q used for last boosted (non leaf) frame (GF/KF/ARF) 502 */ 503 int last_boosted_qindex; 504 505 /*! 506 * Average Q value of previous inter frames 507 */ 508 double avg_q; 509 510 /*! 511 * Q used on last encoded frame of the given type. 512 */ 513 int last_q[FRAME_TYPES]; 514 515 /*! 516 * Correction factors used to adjust the q estimate for a given target rate 517 * in the encode loop. 518 */ 519 double rate_correction_factors[RATE_FACTOR_LEVELS]; 520 521 /*! 522 * Current total consumed bits. 523 */ 524 int64_t total_actual_bits; 525 526 /*! 527 * Current total target bits. 528 */ 529 int64_t total_target_bits; 530 531 /*! 532 * Current buffer level. 533 */ 534 int64_t buffer_level; 535 536 /*! 537 * PCT rc error. 538 */ 539 int rate_error_estimate; 540 541 /*! 542 * Error bits available from previously encoded frames. 543 */ 544 int64_t vbr_bits_off_target; 545 546 /*! 547 * Error bits available from previously encoded frames undershoot. 548 */ 549 int64_t vbr_bits_off_target_fast; 550 551 /*! 552 * Total bits deviated from the average frame target, from previously 553 * encoded frames. 554 */ 555 int64_t bits_off_target; 556 557 /*! 558 * Rolling monitor target bits updated based on current frame target size. 559 */ 560 int rolling_target_bits; 561 562 /*! 563 * Rolling monitor actual bits updated based on current frame final projected 564 * size. 565 */ 566 int rolling_actual_bits; 567 568 /*! 569 * The history of qindex for each frame. 570 * Only used when RT_PASSIVE_STRATEGY = 1. 571 */ 572 int q_history[MAX_Q_HISTORY]; 573 } PRIMARY_RATE_CONTROL; 574 575 /*!\cond */ 576 577 struct AV1_COMP; 578 struct AV1EncoderConfig; 579 struct GF_GROUP; 580 581 void av1_primary_rc_init(const struct AV1EncoderConfig *oxcf, 582 PRIMARY_RATE_CONTROL *p_rc); 583 584 void av1_rc_init(const struct AV1EncoderConfig *oxcf, RATE_CONTROL *rc); 585 586 int av1_estimate_bits_at_q(const struct AV1_COMP *cpi, int q, 587 double correction_factor); 588 589 double av1_convert_qindex_to_q(int qindex, aom_bit_depth_t bit_depth); 590 591 void av1_rc_init_minq_luts(void); 592 593 int av1_rc_get_default_min_gf_interval(int width, int height, double framerate); 594 595 // Generally at the high level, the following flow is expected 596 // to be enforced for rate control: 597 // First call per frame, one of: 598 // av1_get_one_pass_rt_params() 599 // av1_get_second_pass_params() 600 // depending on the usage to set the rate control encode parameters desired. 601 // 602 // Then, call encode_frame_to_data_rate() to perform the 603 // actual encode. This function will in turn call encode_frame() 604 // one or more times, followed by: 605 // av1_rc_postencode_update_drop_frame() 606 // 607 // The majority of rate control parameters are only expected 608 // to be set in the av1_get_..._params() functions and 609 // updated during the av1_rc_postencode_update...() functions. 610 // The only exceptions are av1_rc_drop_frame() and 611 // av1_rc_update_rate_correction_factors() functions. 612 613 // Functions to set parameters for encoding before the actual 614 // encode_frame_to_data_rate() function. 615 struct EncodeFrameInput; 616 617 // Post encode update of the rate control parameters based 618 // on bytes used 619 void av1_rc_postencode_update(struct AV1_COMP *cpi, uint64_t bytes_used); 620 // Post encode update of the rate control parameters for dropped frames 621 void av1_rc_postencode_update_drop_frame(struct AV1_COMP *cpi); 622 623 /*!\endcond */ 624 /*!\brief Updates the rate correction factor linking Q to output bits 625 * 626 * This function updates the Q rate correction factor after an encode 627 * cycle depending on whether we overshot or undershot the target rate. 628 * 629 * \ingroup rate_control 630 * \param[in] cpi Top level encoder instance structure 631 * \param[in] is_encode_stage Indicates if recode loop or post-encode 632 * \param[in] width Frame width 633 * \param[in] height Frame height 634 * 635 * \remark Updates the relevant rate correction factor in cpi->rc 636 */ 637 void av1_rc_update_rate_correction_factors(struct AV1_COMP *cpi, 638 int is_encode_stage, int width, 639 int height); 640 /*!\cond */ 641 642 // Decide if we should drop this frame: For 1-pass CBR. 643 // Changes only the decimation count in the rate control structure 644 int av1_rc_drop_frame(struct AV1_COMP *cpi); 645 646 // Computes frame size bounds. 647 void av1_rc_compute_frame_size_bounds(const struct AV1_COMP *cpi, 648 int this_frame_target, 649 int *frame_under_shoot_limit, 650 int *frame_over_shoot_limit); 651 652 /*!\endcond */ 653 654 /*!\brief Picks q and q bounds given the rate control parameters in \c cpi->rc. 655 * 656 * \ingroup rate_control 657 * \param[in] cpi Top level encoder structure 658 * \param[in] width Coded frame width 659 * \param[in] height Coded frame height 660 * \param[in] gf_index Index of this frame in the golden frame group 661 * \param[out] bottom_index Bottom bound for q index (best quality) 662 * \param[out] top_index Top bound for q index (worst quality) 663 * \return Returns selected q index to be used for encoding this frame. 664 * Also, updates \c rc->arf_q. 665 */ 666 int av1_rc_pick_q_and_bounds(struct AV1_COMP *cpi, int width, int height, 667 int gf_index, int *bottom_index, int *top_index); 668 669 /*!\brief Estimates q to achieve a target bits per frame 670 * 671 * \ingroup rate_control 672 * \param[in] cpi Top level encoder instance structure 673 * \param[in] target_bits_per_frame Frame rate target 674 * \param[in] active_worst_quality Max Q allowed 675 * \param[in] active_best_quality Min Q allowed 676 * \param[in] width Frame width 677 * \param[in] height Frame height 678 * 679 * \return Returns a q index value 680 */ 681 int av1_rc_regulate_q(const struct AV1_COMP *cpi, int target_bits_per_frame, 682 int active_best_quality, int active_worst_quality, 683 int width, int height); 684 685 /*!\cond */ 686 // Estimates bits per mb for a given qindex and correction factor. 687 int av1_rc_bits_per_mb(const struct AV1_COMP *cpi, FRAME_TYPE frame_type, 688 int qindex, double correction_factor, 689 int accurate_estimate); 690 691 // Find q_index corresponding to desired_q, within [best_qindex, worst_qindex]. 692 // To be precise, 'q_index' is the smallest integer, for which the corresponding 693 // q >= desired_q. 694 // If no such q index is found, returns 'worst_qindex'. 695 int av1_find_qindex(double desired_q, aom_bit_depth_t bit_depth, 696 int best_qindex, int worst_qindex); 697 698 // Computes a q delta (in "q index" terms) to get from a starting q value 699 // to a target q value 700 int av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, 701 aom_bit_depth_t bit_depth); 702 703 // Computes a q delta (in "q index" terms) to get from a starting q value 704 // to a value that should equate to the given rate ratio. 705 int av1_compute_qdelta_by_rate(const struct AV1_COMP *cpi, 706 FRAME_TYPE frame_type, int qindex, 707 double rate_target_ratio); 708 709 void av1_rc_update_framerate(struct AV1_COMP *cpi, int width, int height); 710 711 void av1_set_target_rate(struct AV1_COMP *cpi, int width, int height); 712 713 int av1_resize_one_pass_cbr(struct AV1_COMP *cpi); 714 715 void av1_rc_set_frame_target(struct AV1_COMP *cpi, int target, int width, 716 int height); 717 718 void av1_adjust_gf_refresh_qp_one_pass_rt(struct AV1_COMP *cpi); 719 720 void av1_set_rtc_reference_structure_one_layer(struct AV1_COMP *cpi, 721 int gf_update); 722 723 /*!\endcond */ 724 /*!\brief Calculates how many bits to use for a P frame in one pass vbr 725 * 726 * \ingroup rate_control 727 * \callgraph 728 * \callergraph 729 * 730 * \param[in] cpi Top level encoder structure 731 * \param[in] frame_update_type Type of frame 732 * 733 * \return Returns the target number of bits for this frame. 734 */ 735 int av1_calc_pframe_target_size_one_pass_vbr( 736 const struct AV1_COMP *const cpi, FRAME_UPDATE_TYPE frame_update_type); 737 738 /*!\brief Calculates how many bits to use for an i frame in one pass vbr 739 * 740 * \ingroup rate_control 741 * \callgraph 742 * \callergraph 743 * 744 * \param[in] cpi Top level encoder structure 745 * 746 * \return Returns the target number of bits for this frame. 747 */ 748 int av1_calc_iframe_target_size_one_pass_vbr(const struct AV1_COMP *const cpi); 749 750 /*!\brief Calculates how many bits to use for a P frame in one pass cbr 751 * 752 * \ingroup rate_control 753 * \callgraph 754 * \callergraph 755 * 756 * \param[in] cpi Top level encoder structure 757 * \param[in] frame_update_type Type of frame 758 * 759 * \return Returns the target number of bits for this frame. 760 */ 761 int av1_calc_pframe_target_size_one_pass_cbr( 762 const struct AV1_COMP *cpi, FRAME_UPDATE_TYPE frame_update_type); 763 764 /*!\brief Calculates how many bits to use for an i frame in one pass cbr 765 * 766 * \ingroup rate_control 767 * \callgraph 768 * \callergraph 769 * 770 * \param[in] cpi Top level encoder structure 771 * 772 * \return Returns the target number of bits for this frame. 773 */ 774 int av1_calc_iframe_target_size_one_pass_cbr(const struct AV1_COMP *cpi); 775 776 /*!\brief Setup the rate control parameters for 1 pass real-time mode. 777 * 778 * - Sets the frame type and target frame size. 779 * - Sets the GF update. 780 * - Checks for scene change. 781 * - Sets the reference prediction structure for 1 layers (non-SVC). 782 * - Resets and updates are done for SVC. 783 * 784 * \ingroup rate_control 785 * \param[in] cpi Top level encoder structure 786 * \param[in] frame_type Encoder frame type 787 * \param[in] frame_input Current and last input source frames 788 * \param[in] frame_flags Encoder frame flags 789 * 790 * \remark Nothing is returned. Instead the settings computed in this 791 * function are set in: \c frame_params, \c cpi->common, \c cpi->rc, 792 * \c cpi->svc. 793 */ 794 void av1_get_one_pass_rt_params(struct AV1_COMP *cpi, 795 FRAME_TYPE *const frame_type, 796 const struct EncodeFrameInput *frame_input, 797 unsigned int frame_flags); 798 799 /*!\brief Increase q on expected encoder overshoot, for CBR mode. 800 * 801 * Handles the case when encoder is expected to create a large frame: 802 * - q is increased to value closer to \c cpi->rc.worst_quality 803 * - avg_frame_qindex is reset 804 * - buffer levels are reset 805 * - rate correction factor is adjusted 806 * 807 * \ingroup rate_control 808 * \param[in] cpi Top level encoder structure 809 * \param[in] q Current q index 810 * 811 * \return q is returned, and updates are done to \c cpi->rc. 812 */ 813 int av1_encodedframe_overshoot_cbr(struct AV1_COMP *cpi, int *q); 814 815 /*!\brief Check if frame should be dropped, for RTC mode. 816 * 817 * \ingroup rate_control 818 * \param[in] cpi Top level encoder structure 819 * \param[in,out] size Size of encoded frame 820 * 821 * \return 1 if frame is to be dropped, 0 otherwise (no drop). 822 * Set cpi->rc.force_max_q if frame is to be dropped, and updates are 823 * made to rate control parameters. *size is set to 0 when this 824 * function returns 1 (frame is dropped). 825 */ 826 int av1_postencode_drop_cbr(struct AV1_COMP *cpi, size_t *size); 827 828 /*!\brief Compute the q_indices for a single frame. 829 * 830 * Intended to be used with AOM_Q mode. 831 * 832 * \param[in] base_q_index Base q index 833 * \param[in] gf_update_type GOP update type 834 * \param[in] gf_pyramid_level GOP level of the current frame 835 * \param[in] arf_q ARF q_index 836 * 837 * \return Returns the q_index for the current frame. 838 */ 839 int av1_q_mode_get_q_index(int base_q_index, int gf_update_type, 840 int gf_pyramid_level, int arf_q); 841 842 #ifdef __cplusplus 843 } // extern "C" 844 #endif 845 846 #endif // AOM_AV1_ENCODER_RATECTRL_H_ 847