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 MAX_NUM_GF_INTERVALS 15 50 51 #define MAX_ARF_LAYERS 6 52 // #define STRICT_RC 53 54 typedef struct { 55 int resize_width; 56 int resize_height; 57 uint8_t superres_denom; 58 } size_params_type; 59 60 enum { 61 INTER_NORMAL, 62 GF_ARF_LOW, 63 GF_ARF_STD, 64 KF_STD, 65 RATE_FACTOR_LEVELS 66 } UENUM1BYTE(RATE_FACTOR_LEVEL); 67 68 enum { 69 KF_UPDATE, 70 LF_UPDATE, 71 GF_UPDATE, 72 ARF_UPDATE, 73 OVERLAY_UPDATE, 74 INTNL_OVERLAY_UPDATE, // Internal Overlay Frame 75 INTNL_ARF_UPDATE, // Internal Altref Frame 76 FRAME_UPDATE_TYPES 77 } UENUM1BYTE(FRAME_UPDATE_TYPE); 78 79 enum { 80 REFBUF_RESET, // Clear reference frame buffer 81 REFBUF_UPDATE, // Refresh reference frame buffer 82 REFBUF_STATES 83 } UENUM1BYTE(REFBUF_STATE); 84 85 typedef enum { 86 NO_RESIZE = 0, 87 DOWN_THREEFOUR = 1, // From orig to 3/4. 88 DOWN_ONEHALF = 2, // From orig or 3/4 to 1/2. 89 UP_THREEFOUR = -1, // From 1/2 to 3/4. 90 UP_ORIG = -2, // From 1/2 or 3/4 to orig. 91 } RESIZE_ACTION; 92 93 typedef enum { ORIG = 0, THREE_QUARTER = 1, ONE_HALF = 2 } RESIZE_STATE; 94 95 #define MAX_FIRSTPASS_ANALYSIS_FRAMES 150 96 typedef enum region_types { 97 STABLE_REGION = 0, 98 HIGH_VAR_REGION = 1, 99 SCENECUT_REGION = 2, 100 BLENDING_REGION = 3, 101 } REGION_TYPES; 102 103 typedef struct regions { 104 int start; 105 int last; 106 double avg_noise_var; 107 double avg_cor_coeff; 108 double avg_sr_fr_ratio; 109 double avg_intra_err; 110 double avg_coded_err; 111 REGION_TYPES type; 112 } REGIONS; 113 114 /*!\endcond */ 115 /*! 116 * \brief Rate Control parameters and status 117 */ 118 typedef struct { 119 // Rate targetting variables 120 121 /*! 122 * Baseline target rate for frame before adjustment for previous under or 123 * over shoot. 124 */ 125 int base_frame_target; 126 /*! 127 * Target rate for frame after adjustment for previous under or over shoot. 128 */ 129 int this_frame_target; // Actual frame target after rc adjustment. 130 131 /*! 132 * Projected size for current frame 133 */ 134 int projected_frame_size; 135 136 /*! 137 * Bit size of transform coefficient for current frame. 138 */ 139 int coefficient_size; 140 141 /*! 142 * Super block rate target used with some adaptive quantization strategies. 143 */ 144 int sb64_target_rate; 145 146 /*! 147 * Number of frames since the last ARF / GF. 148 */ 149 int frames_since_golden; 150 151 /*! 152 * Number of frames till the next ARF / GF is due. 153 */ 154 int frames_till_gf_update_due; 155 156 /*! 157 * Number of determined gf groups left 158 */ 159 int intervals_till_gf_calculate_due; 160 161 /*!\cond */ 162 int min_gf_interval; 163 int max_gf_interval; 164 int static_scene_max_gf_interval; 165 /*!\endcond */ 166 /*! 167 * Frames before the next key frame 168 */ 169 int frames_to_key; 170 /*!\cond */ 171 int frames_since_key; 172 int frames_to_fwd_kf; 173 int is_src_frame_alt_ref; 174 int sframe_due; 175 176 int high_source_sad; 177 uint64_t avg_source_sad; 178 uint64_t prev_avg_source_sad; 179 180 int avg_frame_bandwidth; // Average frame size target for clip 181 int min_frame_bandwidth; // Minimum allocation used for any frame 182 int max_frame_bandwidth; // Maximum burst rate allowed for a frame. 183 int prev_avg_frame_bandwidth; 184 185 int ni_av_qi; 186 int ni_tot_qi; 187 188 int decimation_factor; 189 int decimation_count; 190 191 /*!\endcond */ 192 /*! 193 * User specified maximum Q allowed for current frame 194 */ 195 int worst_quality; 196 /*! 197 * User specified minimum Q allowed for current frame 198 */ 199 int best_quality; 200 201 /*!\cond */ 202 203 // rate control history for last frame(1) and the frame before(2). 204 // -1: undershot 205 // 1: overshoot 206 // 0: not initialized. 207 int rc_1_frame; 208 int rc_2_frame; 209 int q_1_frame; 210 int q_2_frame; 211 212 /*!\endcond */ 213 /*! 214 * Proposed maximum alloed Q for current frame 215 */ 216 int active_worst_quality; 217 218 /*!\cond */ 219 // Track amount of low motion in scene 220 int avg_frame_low_motion; 221 222 // For dynamic resize, 1 pass cbr. 223 RESIZE_STATE resize_state; 224 int resize_avg_qp; 225 int resize_buffer_underflow; 226 int resize_count; 227 #if CONFIG_FRAME_PARALLEL_ENCODE 228 int frame_level_fast_extra_bits; 229 double frame_level_rate_correction_factors[RATE_FACTOR_LEVELS]; 230 #endif 231 /*!\endcond */ 232 } RATE_CONTROL; 233 234 /*! 235 * \brief Primary Rate Control parameters and status 236 */ 237 typedef struct { 238 // Sub-gop level Rate targetting variables 239 240 /*! 241 * Target bit budget for the current GF / ARF group of frame. 242 */ 243 int64_t gf_group_bits; 244 245 /*! 246 * Boost factor used to calculate the extra bits allocated to the key frame 247 */ 248 int kf_boost; 249 250 /*! 251 * Boost factor used to calculate the extra bits allocated to ARFs and GFs 252 */ 253 int gfu_boost; 254 255 /*! 256 * Stores the determined gf group lengths for a set of gf groups 257 */ 258 int gf_intervals[MAX_NUM_GF_INTERVALS]; 259 260 /*! 261 * The current group's index into gf_intervals[] 262 */ 263 int cur_gf_index; 264 265 /*!\cond */ 266 int num_regions; 267 268 REGIONS regions[MAX_FIRSTPASS_ANALYSIS_FRAMES]; 269 int regions_offset; // offset of regions from the last keyframe 270 int frames_till_regions_update; 271 272 int baseline_gf_interval; 273 274 int constrained_gf_group; 275 276 int this_key_frame_forced; 277 278 int next_key_frame_forced; 279 /*!\endcond */ 280 281 /*! 282 * Initial buffuer level in ms for CBR / low delay encoding 283 */ 284 int64_t starting_buffer_level; 285 286 /*! 287 * Optimum / target buffuer level in ms for CBR / low delay encoding 288 */ 289 int64_t optimal_buffer_level; 290 291 /*! 292 * Maximum target buffuer level in ms for CBR / low delay encoding 293 */ 294 int64_t maximum_buffer_size; 295 296 /*! 297 * Q index used for ALT frame 298 */ 299 int arf_q; 300 301 /*!\cond */ 302 float_t arf_boost_factor; 303 304 int base_layer_qp; 305 306 // Total number of stats used only for kf_boost calculation. 307 int num_stats_used_for_kf_boost; 308 309 // Total number of stats used only for gfu_boost calculation. 310 int num_stats_used_for_gfu_boost; 311 312 // Total number of stats required by gfu_boost calculation. 313 int num_stats_required_for_gfu_boost; 314 315 int enable_scenecut_detection; 316 317 int use_arf_in_this_kf_group; 318 319 int ni_frames; 320 321 double tot_q; 322 /*!\endcond */ 323 324 /*! 325 * Q used for last boosted (non leaf) frame 326 */ 327 int last_kf_qindex; 328 329 /*! 330 * Average of q index of previous encoded frames in a sequence. 331 */ 332 int avg_frame_qindex[FRAME_TYPES]; 333 334 /*! 335 * Proposed minimum allowed Q different layers in a coding pyramid 336 */ 337 int active_best_quality[MAX_ARF_LAYERS + 1]; 338 339 /*! 340 * Q used for last boosted (non leaf) frame (GF/KF/ARF) 341 */ 342 int last_boosted_qindex; 343 344 /*! 345 * Average Q value of previous inter frames 346 */ 347 double avg_q; 348 349 /*! 350 * Q used on last encoded frame of the given type. 351 */ 352 int last_q[FRAME_TYPES]; 353 354 /*! 355 * Correction factors used to adjust the q estimate for a given target rate 356 * in the encode loop. 357 */ 358 double rate_correction_factors[RATE_FACTOR_LEVELS]; 359 360 /*! 361 * Current total consumed bits. 362 */ 363 int64_t total_actual_bits; 364 365 /*! 366 * Current total target bits. 367 */ 368 int64_t total_target_bits; 369 370 /*! 371 * Current buffer level. 372 */ 373 int64_t buffer_level; 374 375 /*! 376 * PCT rc error. 377 */ 378 int rate_error_estimate; 379 380 /*! 381 * Error bits available from previously encoded frames. 382 */ 383 int64_t vbr_bits_off_target; 384 385 /*! 386 * Error bits available from previously encoded frames undershoot. 387 */ 388 int64_t vbr_bits_off_target_fast; 389 390 /*! 391 * Total bits deviated from the average frame target, from previously 392 * encoded frames. 393 */ 394 int64_t bits_off_target; 395 396 /*! 397 * Rolling monitor target bits updated based on current frame target size. 398 */ 399 int rolling_target_bits; 400 401 /*! 402 * Rolling monitor actual bits updated based on current frame final projected 403 * size. 404 */ 405 int rolling_actual_bits; 406 } PRIMARY_RATE_CONTROL; 407 408 struct AV1_COMP; 409 struct AV1EncoderConfig; 410 struct GF_GROUP; 411 412 void av1_primary_rc_init(const struct AV1EncoderConfig *oxcf, 413 PRIMARY_RATE_CONTROL *p_rc); 414 415 void av1_rc_init(const struct AV1EncoderConfig *oxcf, RATE_CONTROL *rc); 416 417 int av1_estimate_bits_at_q(FRAME_TYPE frame_kind, int q, int mbs, 418 double correction_factor, aom_bit_depth_t bit_depth, 419 const int is_screen_content_type); 420 421 double av1_convert_qindex_to_q(int qindex, aom_bit_depth_t bit_depth); 422 423 void av1_rc_init_minq_luts(void); 424 425 int av1_rc_get_default_min_gf_interval(int width, int height, double framerate); 426 // Note av1_rc_get_default_max_gf_interval() requires the min_gf_interval to 427 // be passed in to ensure that the max_gf_interval returned is at least as bis 428 // as that. 429 int av1_rc_get_default_max_gf_interval(double framerate, int min_gf_interval); 430 431 // Generally at the high level, the following flow is expected 432 // to be enforced for rate control: 433 // First call per frame, one of: 434 // av1_rc_get_first_pass_params() 435 // av1_rc_get_second_pass_params() 436 // depending on the usage to set the rate control encode parameters desired. 437 // 438 // Then, call encode_frame_to_data_rate() to perform the 439 // actual encode. This function will in turn call encode_frame() 440 // one or more times, followed by: 441 // av1_rc_postencode_update_drop_frame() 442 // 443 // The majority of rate control parameters are only expected 444 // to be set in the av1_rc_get_..._params() functions and 445 // updated during the av1_rc_postencode_update...() functions. 446 // The only exceptions are av1_rc_drop_frame() and 447 // av1_rc_update_rate_correction_factors() functions. 448 449 // Functions to set parameters for encoding before the actual 450 // encode_frame_to_data_rate() function. 451 struct EncodeFrameParams; 452 453 // Post encode update of the rate control parameters based 454 // on bytes used 455 void av1_rc_postencode_update(struct AV1_COMP *cpi, uint64_t bytes_used); 456 // Post encode update of the rate control parameters for dropped frames 457 void av1_rc_postencode_update_drop_frame(struct AV1_COMP *cpi); 458 459 /*!\endcond */ 460 /*!\brief Updates the rate correction factor linking Q to output bits 461 * 462 * This function updates the Q rate correction factor after an encode 463 * cycle depending on whether we overshot or undershot the target rate. 464 * 465 * \ingroup rate_control 466 * \param[in] cpi Top level encoder instance structure 467 * \param[in] width Frame width 468 * \param[in] height Frame height 469 * 470 * \return None but updates the relevant rate correction factor in cpi->rc 471 */ 472 void av1_rc_update_rate_correction_factors(struct AV1_COMP *cpi, 473 #if CONFIG_FRAME_PARALLEL_ENCODE 474 int is_encode_stage, 475 #endif // CONFIG_FRAME_PARALLEL_ENCODE 476 int width, int height); 477 /*!\cond */ 478 479 // Decide if we should drop this frame: For 1-pass CBR. 480 // Changes only the decimation count in the rate control structure 481 int av1_rc_drop_frame(struct AV1_COMP *cpi); 482 483 // Computes frame size bounds. 484 void av1_rc_compute_frame_size_bounds(const struct AV1_COMP *cpi, 485 int this_frame_target, 486 int *frame_under_shoot_limit, 487 int *frame_over_shoot_limit); 488 489 /*!\endcond */ 490 491 /*!\brief Picks q and q bounds given the rate control parameters in \c cpi->rc. 492 * 493 * \ingroup rate_control 494 * \param[in] cpi Top level encoder structure 495 * \param[in] width Coded frame width 496 * \param[in] height Coded frame height 497 * \param[in] gf_index Index of this frame in the golden frame group 498 * \param[out] bottom_index Bottom bound for q index (best quality) 499 * \param[out] top_index Top bound for q index (worst quality) 500 * \return Returns selected q index to be used for encoding this frame. 501 * Also, updates \c rc->arf_q. 502 */ 503 int av1_rc_pick_q_and_bounds(const struct AV1_COMP *cpi, int width, int height, 504 int gf_index, int *bottom_index, int *top_index); 505 506 /*!\brief Estimates q to achieve a target bits per frame 507 * 508 * \ingroup rate_control 509 * \param[in] cpi Top level encoder instance structure 510 * \param[in] target_bits_per_frame Frame rate target 511 * \param[in] active_worst_quality Max Q allowed 512 * \param[in] active_best_quality Min Q allowed 513 * \param[in] width Frame width 514 * \param[in] height Frame height 515 * 516 * \return Returns a q index value 517 */ 518 int av1_rc_regulate_q(const struct AV1_COMP *cpi, int target_bits_per_frame, 519 int active_best_quality, int active_worst_quality, 520 int width, int height); 521 522 /*!\cond */ 523 // Estimates bits per mb for a given qindex and correction factor. 524 int av1_rc_bits_per_mb(FRAME_TYPE frame_type, int qindex, 525 double correction_factor, aom_bit_depth_t bit_depth, 526 const int is_screen_content_type); 527 528 // Clamping utilities for bitrate targets for iframes and pframes. 529 int av1_rc_clamp_iframe_target_size(const struct AV1_COMP *const cpi, 530 int target); 531 int av1_rc_clamp_pframe_target_size(const struct AV1_COMP *const cpi, 532 int target, uint8_t frame_update_type); 533 534 // Find q_index corresponding to desired_q, within [best_qindex, worst_qindex]. 535 // To be precise, 'q_index' is the smallest integer, for which the corresponding 536 // q >= desired_q. 537 // If no such q index is found, returns 'worst_qindex'. 538 int av1_find_qindex(double desired_q, aom_bit_depth_t bit_depth, 539 int best_qindex, int worst_qindex); 540 541 // Computes a q delta (in "q index" terms) to get from a starting q value 542 // to a target q value 543 int av1_compute_qdelta(const RATE_CONTROL *rc, double qstart, double qtarget, 544 aom_bit_depth_t bit_depth); 545 546 // Computes a q delta (in "q index" terms) to get from a starting q value 547 // to a value that should equate to the given rate ratio. 548 int av1_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type, 549 int qindex, double rate_target_ratio, 550 const int is_screen_content_type, 551 aom_bit_depth_t bit_depth); 552 553 int av1_frame_type_qdelta(const struct AV1_COMP *cpi, int q); 554 555 void av1_rc_update_framerate(struct AV1_COMP *cpi, int width, int height); 556 557 void av1_rc_set_gf_interval_range(const struct AV1_COMP *const cpi, 558 RATE_CONTROL *const rc); 559 560 void av1_set_target_rate(struct AV1_COMP *cpi, int width, int height); 561 562 int av1_resize_one_pass_cbr(struct AV1_COMP *cpi); 563 564 void av1_rc_set_frame_target(struct AV1_COMP *cpi, int target, int width, 565 int height); 566 567 void av1_set_reference_structure_one_pass_rt(struct AV1_COMP *cpi, 568 int gf_update); 569 570 /*!\endcond */ 571 /*!\brief Calculates how many bits to use for a P frame in one pass vbr 572 * 573 * \ingroup rate_control 574 * \callgraph 575 * \callergraph 576 * 577 * \param[in] cpi Top level encoder structure 578 * \param[in] frame_update_type Type of frame 579 * 580 * \return Returns the target number of bits for this frame. 581 */ 582 int av1_calc_pframe_target_size_one_pass_vbr( 583 const struct AV1_COMP *const cpi, FRAME_UPDATE_TYPE frame_update_type); 584 585 /*!\brief Calculates how many bits to use for an i frame in one pass vbr 586 * 587 * \ingroup rate_control 588 * \callgraph 589 * \callergraph 590 * 591 * \param[in] cpi Top level encoder structure 592 * 593 * \return Returns the target number of bits for this frame. 594 */ 595 int av1_calc_iframe_target_size_one_pass_vbr(const struct AV1_COMP *const cpi); 596 597 /*!\brief Calculates how many bits to use for a P frame in one pass cbr 598 * 599 * \ingroup rate_control 600 * \callgraph 601 * \callergraph 602 * 603 * \param[in] cpi Top level encoder structure 604 * \param[in] frame_update_type Type of frame 605 * 606 * \return Returns the target number of bits for this frame. 607 */ 608 int av1_calc_pframe_target_size_one_pass_cbr( 609 const struct AV1_COMP *cpi, FRAME_UPDATE_TYPE frame_update_type); 610 611 /*!\brief Calculates how many bits to use for an i frame in one pass cbr 612 * 613 * \ingroup rate_control 614 * \callgraph 615 * \callergraph 616 * 617 * \param[in] cpi Top level encoder structure 618 * 619 * \return Returns the target number of bits for this frame. 620 */ 621 int av1_calc_iframe_target_size_one_pass_cbr(const struct AV1_COMP *cpi); 622 623 /*!\brief Setup the rate control parameters for 1 pass real-time mode. 624 * 625 * - Sets the frame type and target frame size. 626 * - Sets the GF update. 627 * - Checks for scene change. 628 * - Sets the reference prediction structure for 1 layers (non-SVC). 629 * - Resets and updates are done for SVC. 630 * 631 * \ingroup rate_control 632 * \param[in] cpi Top level encoder structure 633 * \param[in] frame_params Encoder frame parameters 634 * \param[in] frame_flags Emcoder frame flags 635 * 636 * \return Nothing is returned. Instead the settings computed in this 637 * funtion are set in: \c frame_params, \c cpi->common, \c cpi->rc, \c cpi->svc. 638 */ 639 void av1_get_one_pass_rt_params(struct AV1_COMP *cpi, 640 struct EncodeFrameParams *const frame_params, 641 unsigned int frame_flags); 642 643 /*!\brief Increase q on expected encoder overshoot, for CBR mode. 644 * 645 * Handles the case when encoder is expected to create a large frame: 646 * - q is increased to value closer to \c cpi->rc.worst_quality 647 * - avg_frame_qindex is reset 648 * - buffer levels are reset 649 * - rate correction factor is adjusted 650 * 651 * \ingroup rate_control 652 * \param[in] cpi Top level encoder structure 653 * \param[in] q Current q index 654 * 655 * \return q is returned, and updates are done to \c cpi->rc. 656 */ 657 int av1_encodedframe_overshoot_cbr(struct AV1_COMP *cpi, int *q); 658 659 #if !CONFIG_REALTIME_ONLY 660 /*!\brief Compute the q_indices for the entire GOP. 661 * 662 * \param[in] gf_frame_index Index of the current frame 663 * \param[in] base_q_index Base q index 664 * \param[in] arf_qstep_ratio The quantize step ratio between arf q 665 * index and base q index 666 * \param[in] bit_depth Bit depth 667 * \param[in] gf_group Pointer to the GOP 668 * \param[out] q_index_list An array to store output gop q indices. 669 * the array size should be equal or 670 * greater than gf_group.size() 671 */ 672 void av1_q_mode_compute_gop_q_indices(int gf_frame_index, int base_q_index, 673 double arf_qstep_ratio, 674 aom_bit_depth_t bit_depth, 675 const struct GF_GROUP *gf_group, 676 int *q_index_list); 677 #endif // !CONFIG_REALTIME_ONLY 678 679 /*!\brief Compute the q_indices for a single frame. 680 * 681 * Intended to be used with AOM_Q mode. 682 * 683 * \param[in] base_q_index Base q index 684 * \param[in] gf_update_type GOP update type 685 * \param[in] gf_pyramid_level GOP level of the current frame 686 * \param[in] arf_q ARF q_index 687 * 688 * \return Returns the q_index for the current frame. 689 */ 690 int av1_q_mode_get_q_index(int base_q_index, int gf_update_type, 691 int gf_pyramid_level, int arf_q); 692 693 /*!\brief Compute the q_indices for the ARF of a GOP. 694 * 695 * \param[in] base_q_index Base q index 696 * \param[in] gfu_boost GFU boost 697 * \param[in] bit_depth Bit depth 698 * \param[in] arf_boost_factor ARF boost factor 699 * 700 * \return Returns the q_index for the ARF frame. 701 */ 702 int av1_get_arf_q_index(int base_q_index, int gfu_boost, int bit_depth, 703 double arf_boost_factor); 704 705 #if !CONFIG_REALTIME_ONLY 706 struct TplDepFrame; 707 /*!\brief Compute the q_indices for the ARF of a GOP in Q mode. 708 * 709 * \param[in] cpi Top level encoder structure 710 * \param[in] tpl_frame Tpl Frame stats 711 * 712 * \return Returns the q_index for the ARF frame. 713 */ 714 int av1_get_arf_q_index_q_mode(struct AV1_COMP *cpi, 715 struct TplDepFrame *tpl_frame); 716 #endif 717 #ifdef __cplusplus 718 } // extern "C" 719 #endif 720 721 #endif // AOM_AV1_ENCODER_RATECTRL_H_ 722