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author | trav90 <travawine@palemoon.org> | 2018-10-18 21:53:44 -0500 |
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committer | trav90 <travawine@palemoon.org> | 2018-10-18 21:53:44 -0500 |
commit | ec910d81405c736a4490383a250299a7837c2e64 (patch) | |
tree | 4f27cc226f93a863121aef6c56313e4153a69b3e /third_party/aom/av1/encoder/ratectrl.c | |
parent | 01eb57073ba97b2d6cbf20f745dfcc508197adc3 (diff) | |
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Update aom to commit id e87fb2378f01103d5d6e477a4ef6892dc714e614
Diffstat (limited to 'third_party/aom/av1/encoder/ratectrl.c')
-rw-r--r-- | third_party/aom/av1/encoder/ratectrl.c | 215 |
1 files changed, 104 insertions, 111 deletions
diff --git a/third_party/aom/av1/encoder/ratectrl.c b/third_party/aom/av1/encoder/ratectrl.c index b546fdffa..a90cb880e 100644 --- a/third_party/aom/av1/encoder/ratectrl.c +++ b/third_party/aom/av1/encoder/ratectrl.c @@ -29,6 +29,7 @@ #include "av1/common/seg_common.h" #include "av1/encoder/encodemv.h" +#include "av1/encoder/random.h" #include "av1/encoder/ratectrl.h" // Max rate target for 1080P and below encodes under normal circumstances @@ -93,9 +94,11 @@ static int gf_low = 400; static int kf_high = 5000; static int kf_low = 400; -double av1_resize_rate_factor(const AV1_COMP *cpi) { - return (double)(cpi->oxcf.width * cpi->oxcf.height) / - (cpi->common.width * cpi->common.height); +// How many times less pixels there are to encode given the current scaling. +// Temporary replacement for rcf_mult and rate_thresh_mult. +static double resize_rate_factor(const AV1_COMP *cpi, int width, int height) { + (void)cpi; + return (double)(cpi->oxcf.width * cpi->oxcf.height) / (width * height); } // Functions to compute the active minq lookup table entries based on a @@ -371,7 +374,8 @@ int av1_rc_drop_frame(AV1_COMP *cpi) { } } -static double get_rate_correction_factor(const AV1_COMP *cpi) { +static double get_rate_correction_factor(const AV1_COMP *cpi, int width, + int height) { const RATE_CONTROL *const rc = &cpi->rc; double rcf; @@ -389,15 +393,16 @@ static double get_rate_correction_factor(const AV1_COMP *cpi) { else rcf = rc->rate_correction_factors[INTER_NORMAL]; } - rcf *= av1_resize_rate_factor(cpi); + rcf *= resize_rate_factor(cpi, width, height); return fclamp(rcf, MIN_BPB_FACTOR, MAX_BPB_FACTOR); } -static void set_rate_correction_factor(AV1_COMP *cpi, double factor) { +static void set_rate_correction_factor(AV1_COMP *cpi, double factor, int width, + int height) { RATE_CONTROL *const rc = &cpi->rc; // Normalize RCF to account for the size-dependent scaling factor. - factor /= av1_resize_rate_factor(cpi); + factor /= resize_rate_factor(cpi, width, height); factor = fclamp(factor, MIN_BPB_FACTOR, MAX_BPB_FACTOR); @@ -417,11 +422,14 @@ static void set_rate_correction_factor(AV1_COMP *cpi, double factor) { } } -void av1_rc_update_rate_correction_factors(AV1_COMP *cpi) { +void av1_rc_update_rate_correction_factors(AV1_COMP *cpi, int width, + int height) { const AV1_COMMON *const cm = &cpi->common; int correction_factor = 100; - double rate_correction_factor = get_rate_correction_factor(cpi); + double rate_correction_factor = + get_rate_correction_factor(cpi, width, height); double adjustment_limit; + const int MBs = av1_get_MBs(width, height); int projected_size_based_on_q = 0; @@ -439,7 +447,7 @@ void av1_rc_update_rate_correction_factors(AV1_COMP *cpi) { av1_cyclic_refresh_estimate_bits_at_q(cpi, rate_correction_factor); } else { projected_size_based_on_q = - av1_estimate_bits_at_q(cpi->common.frame_type, cm->base_qindex, cm->MBs, + av1_estimate_bits_at_q(cpi->common.frame_type, cm->base_qindex, MBs, rate_correction_factor, cm->bit_depth); } // Work out a size correction factor. @@ -485,21 +493,24 @@ void av1_rc_update_rate_correction_factors(AV1_COMP *cpi) { rate_correction_factor = MIN_BPB_FACTOR; } - set_rate_correction_factor(cpi, rate_correction_factor); + set_rate_correction_factor(cpi, rate_correction_factor, width, height); } int av1_rc_regulate_q(const AV1_COMP *cpi, int target_bits_per_frame, - int active_best_quality, int active_worst_quality) { + int active_best_quality, int active_worst_quality, + int width, int height) { const AV1_COMMON *const cm = &cpi->common; int q = active_worst_quality; int last_error = INT_MAX; int i, target_bits_per_mb, bits_per_mb_at_this_q; - const double correction_factor = get_rate_correction_factor(cpi); + const int MBs = av1_get_MBs(width, height); + const double correction_factor = + get_rate_correction_factor(cpi, width, height); // Calculate required scaling factor based on target frame size and size of // frame produced using previous Q. target_bits_per_mb = - (int)((uint64_t)target_bits_per_frame << BPER_MB_NORMBITS) / cm->MBs; + (int)((uint64_t)(target_bits_per_frame) << BPER_MB_NORMBITS) / MBs; i = active_best_quality; @@ -579,8 +590,11 @@ static int calc_active_worst_quality_one_pass_vbr(const AV1_COMP *cpi) { active_worst_quality = curr_frame == 0 ? rc->worst_quality : rc->last_q[KEY_FRAME] * 2; } else { - if (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { + if (!rc->is_src_frame_alt_ref && (cpi->refresh_golden_frame || +#if CONFIG_EXT_REFS + cpi->refresh_alt2_ref_frame || +#endif // CONFIG_EXT_REFS + cpi->refresh_alt_ref_frame)) { active_worst_quality = curr_frame == 1 ? rc->last_q[KEY_FRAME] * 5 / 4 : rc->last_q[INTER_FRAME]; } else { @@ -647,8 +661,8 @@ static int calc_active_worst_quality_one_pass_cbr(const AV1_COMP *cpi) { return active_worst_quality; } -static int rc_pick_q_and_bounds_one_pass_cbr(const AV1_COMP *cpi, - int *bottom_index, +static int rc_pick_q_and_bounds_one_pass_cbr(const AV1_COMP *cpi, int width, + int height, int *bottom_index, int *top_index) { const AV1_COMMON *const cm = &cpi->common; const RATE_CONTROL *const rc = &cpi->rc; @@ -678,7 +692,7 @@ static int rc_pick_q_and_bounds_one_pass_cbr(const AV1_COMP *cpi, rc, rc->avg_frame_qindex[KEY_FRAME], cm->bit_depth); // Allow somewhat lower kf minq with small image formats. - if ((cm->width * cm->height) <= (352 * 288)) { + if ((width * height) <= (352 * 288)) { q_adj_factor -= 0.25; } @@ -740,7 +754,7 @@ static int rc_pick_q_and_bounds_one_pass_cbr(const AV1_COMP *cpi, q = rc->last_boosted_qindex; } else { q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, - active_worst_quality); + active_worst_quality, width, height); if (q > *top_index) { // Special case when we are targeting the max allowed rate if (rc->this_frame_target >= rc->max_frame_bandwidth) @@ -770,8 +784,8 @@ static int get_active_cq_level(const RATE_CONTROL *rc, return active_cq_level; } -static int rc_pick_q_and_bounds_one_pass_vbr(const AV1_COMP *cpi, - int *bottom_index, +static int rc_pick_q_and_bounds_one_pass_vbr(const AV1_COMP *cpi, int width, + int height, int *bottom_index, int *top_index) { const AV1_COMMON *const cm = &cpi->common; const RATE_CONTROL *const rc = &cpi->rc; @@ -804,7 +818,7 @@ static int rc_pick_q_and_bounds_one_pass_vbr(const AV1_COMP *cpi, rc, rc->avg_frame_qindex[KEY_FRAME], cm->bit_depth); // Allow somewhat lower kf minq with small image formats. - if ((cm->width * cm->height) <= (352 * 288)) { + if ((width * height) <= (352 * 288)) { q_adj_factor -= 0.25; } @@ -899,7 +913,7 @@ static int rc_pick_q_and_bounds_one_pass_vbr(const AV1_COMP *cpi, q = rc->last_boosted_qindex; } else { q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, - active_worst_quality); + active_worst_quality, width, height); if (q > *top_index) { // Special case when we are targeting the max allowed rate if (rc->this_frame_target >= rc->max_frame_bandwidth) @@ -945,7 +959,8 @@ int av1_frame_type_qdelta(const AV1_COMP *cpi, int rf_level, int q) { } #define STATIC_MOTION_THRESH 95 -static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int *bottom_index, +static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int width, + int height, int *bottom_index, int *top_index) { const AV1_COMMON *const cm = &cpi->common; const RATE_CONTROL *const rc = &cpi->rc; @@ -992,7 +1007,7 @@ static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int *bottom_index, get_kf_active_quality(rc, active_worst_quality, cm->bit_depth); // Allow somewhat lower kf minq with small image formats. - if ((cm->width * cm->height) <= (352 * 288)) { + if ((width * height) <= (352 * 288)) { q_adj_factor -= 0.25; } @@ -1005,8 +1020,11 @@ static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int *bottom_index, active_best_quality += av1_compute_qdelta(rc, q_val, q_val * q_adj_factor, cm->bit_depth); } - } else if (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { + } else if (!rc->is_src_frame_alt_ref && (cpi->refresh_golden_frame || +#if CONFIG_EXT_REFS + cpi->refresh_alt2_ref_frame || +#endif // CONFIG_EXT_REFS + cpi->refresh_alt_ref_frame)) { // Use the lower of active_worst_quality and recent // average Q as basis for GF/ARF best Q limit unless last frame was // a key frame. @@ -1026,7 +1044,11 @@ static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int *bottom_index, active_best_quality = active_best_quality * 15 / 16; } else if (oxcf->rc_mode == AOM_Q) { +#if CONFIG_EXT_REFS + if (!cpi->refresh_alt_ref_frame && !cpi->refresh_alt2_ref_frame) { +#else if (!cpi->refresh_alt_ref_frame) { +#endif // CONFIG_EXT_REFS active_best_quality = cq_level; } else { active_best_quality = get_gf_active_quality(rc, q, cm->bit_depth); @@ -1058,8 +1080,11 @@ static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int *bottom_index, if ((cpi->oxcf.rc_mode != AOM_Q) && (cpi->twopass.gf_zeromotion_pct < VLOW_MOTION_THRESHOLD)) { if (frame_is_intra_only(cm) || - (!rc->is_src_frame_alt_ref && - (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame))) { + (!rc->is_src_frame_alt_ref && (cpi->refresh_golden_frame || +#if CONFIG_EXT_REFS + cpi->refresh_alt2_ref_frame || +#endif // CONFIG_EXT_REFS + cpi->refresh_alt_ref_frame))) { active_best_quality -= (cpi->twopass.extend_minq + cpi->twopass.extend_minq_fast); active_worst_quality += (cpi->twopass.extend_maxq / 2); @@ -1105,7 +1130,7 @@ static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int *bottom_index, } } else { q = av1_rc_regulate_q(cpi, rc->this_frame_target, active_best_quality, - active_worst_quality); + active_worst_quality, width, height); if (q > active_worst_quality) { // Special case when we are targeting the max allowed rate. if (rc->this_frame_target >= rc->max_frame_bandwidth) @@ -1126,16 +1151,19 @@ static int rc_pick_q_and_bounds_two_pass(const AV1_COMP *cpi, int *bottom_index, return q; } -int av1_rc_pick_q_and_bounds(const AV1_COMP *cpi, int *bottom_index, - int *top_index) { +int av1_rc_pick_q_and_bounds(const AV1_COMP *cpi, int width, int height, + int *bottom_index, int *top_index) { int q; if (cpi->oxcf.pass == 0) { if (cpi->oxcf.rc_mode == AOM_CBR) - q = rc_pick_q_and_bounds_one_pass_cbr(cpi, bottom_index, top_index); + q = rc_pick_q_and_bounds_one_pass_cbr(cpi, width, height, bottom_index, + top_index); else - q = rc_pick_q_and_bounds_one_pass_vbr(cpi, bottom_index, top_index); + q = rc_pick_q_and_bounds_one_pass_vbr(cpi, width, height, bottom_index, + top_index); } else { - q = rc_pick_q_and_bounds_two_pass(cpi, bottom_index, top_index); + q = rc_pick_q_and_bounds_two_pass(cpi, width, height, bottom_index, + top_index); } return q; @@ -1157,7 +1185,8 @@ void av1_rc_compute_frame_size_bounds(const AV1_COMP *cpi, int frame_target, } } -void av1_rc_set_frame_target(AV1_COMP *cpi, int target) { +static void rc_set_frame_target(AV1_COMP *cpi, int target, int width, + int height) { const AV1_COMMON *const cm = &cpi->common; RATE_CONTROL *const rc = &cpi->rc; @@ -1166,11 +1195,11 @@ void av1_rc_set_frame_target(AV1_COMP *cpi, int target) { // Modify frame size target when down-scaled. if (!av1_frame_unscaled(cm)) rc->this_frame_target = - (int)(rc->this_frame_target * av1_resize_rate_factor(cpi)); + (int)(rc->this_frame_target * resize_rate_factor(cpi, width, height)); // Target rate per SB64 (including partial SB64s. - rc->sb64_target_rate = (int)((int64_t)rc->this_frame_target * 64 * 64) / - (cm->width * cm->height); + rc->sb64_target_rate = + (int)((int64_t)rc->this_frame_target * 64 * 64) / (width * height); } static void update_alt_ref_frame_stats(AV1_COMP *cpi) { @@ -1194,7 +1223,7 @@ static void update_golden_frame_stats(AV1_COMP *cpi) { // only the virtual indices for the reference frame will be // updated and cpi->refresh_golden_frame will still be zero. if (cpi->refresh_golden_frame || rc->is_src_frame_alt_ref) { -#else +#else // !CONFIG_EXT_REFS // Update the Golden frame usage counts. if (cpi->refresh_golden_frame) { #endif // CONFIG_EXT_REFS @@ -1219,7 +1248,11 @@ static void update_golden_frame_stats(AV1_COMP *cpi) { // Decrement count down till next gf if (rc->frames_till_gf_update_due > 0) rc->frames_till_gf_update_due--; +#if CONFIG_EXT_REFS + } else if (!cpi->refresh_alt_ref_frame && !cpi->refresh_alt2_ref_frame) { +#else } else if (!cpi->refresh_alt_ref_frame) { +#endif // CONFIG_EXT_REFS // Decrement count down till next gf if (rc->frames_till_gf_update_due > 0) rc->frames_till_gf_update_due--; @@ -1240,7 +1273,7 @@ void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { rc->projected_frame_size = (int)(bytes_used << 3); // Post encode loop adjustment of Q prediction. - av1_rc_update_rate_correction_factors(cpi); + av1_rc_update_rate_correction_factors(cpi, cm->width, cm->height); // Keep a record of last Q and ambient average Q. if (cm->frame_type == KEY_FRAME) { @@ -1249,7 +1282,11 @@ void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[KEY_FRAME] + qindex, 2); } else { if (!rc->is_src_frame_alt_ref && - !(cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)) { + !(cpi->refresh_golden_frame || +#if CONFIG_EXT_REFS + cpi->refresh_alt2_ref_frame || +#endif // CONFIG_EXT_REFS + cpi->refresh_alt_ref_frame)) { rc->last_q[INTER_FRAME] = qindex; rc->avg_frame_qindex[INTER_FRAME] = ROUND_POWER_OF_TWO(3 * rc->avg_frame_qindex[INTER_FRAME] + qindex, 2); @@ -1271,6 +1308,9 @@ void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { if ((qindex < rc->last_boosted_qindex) || (cm->frame_type == KEY_FRAME) || (!rc->constrained_gf_group && (cpi->refresh_alt_ref_frame || +#if CONFIG_EXT_REFS + cpi->refresh_alt2_ref_frame || +#endif // CONFIG_EXT_REFS (cpi->refresh_golden_frame && !rc->is_src_frame_alt_ref)))) { rc->last_boosted_qindex = qindex; } @@ -1280,6 +1320,10 @@ void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { // Rolling monitors of whether we are over or underspending used to help // regulate min and Max Q in two pass. + if (!av1_frame_unscaled(cm)) + rc->this_frame_target = + (int)(rc->this_frame_target / + resize_rate_factor(cpi, cm->width, cm->height)); if (cm->frame_type != KEY_FRAME) { rc->rolling_target_bits = ROUND_POWER_OF_TWO( rc->rolling_target_bits * 3 + rc->this_frame_target, 2); @@ -1294,6 +1338,8 @@ void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { // Actual bits spent rc->total_actual_bits += rc->projected_frame_size; #if CONFIG_EXT_REFS + // TODO(zoeliu): To investigate whether we should treat BWDREF_FRAME + // differently here for rc->avg_frame_bandwidth. rc->total_target_bits += (cm->show_frame || rc->is_bwd_ref_frame) ? rc->avg_frame_bandwidth : 0; #else @@ -1313,6 +1359,8 @@ void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { if (cm->frame_type == KEY_FRAME) rc->frames_since_key = 0; #if CONFIG_EXT_REFS + // TODO(zoeliu): To investigate whether we should treat BWDREF_FRAME + // differently here for rc->avg_frame_bandwidth. if (cm->show_frame || rc->is_bwd_ref_frame) { #else if (cm->show_frame) { @@ -1320,6 +1368,12 @@ void av1_rc_postencode_update(AV1_COMP *cpi, uint64_t bytes_used) { rc->frames_since_key++; rc->frames_to_key--; } + // if (cm->current_video_frame == 1 && cm->show_frame) + /* + rc->this_frame_target = + (int)(rc->this_frame_target / resize_rate_factor(cpi, cm->width, + cm->height)); + */ } void av1_rc_postencode_update_drop_frame(AV1_COMP *cpi) { @@ -1394,7 +1448,7 @@ void av1_rc_get_one_pass_vbr_params(AV1_COMP *cpi) { target = calc_iframe_target_size_one_pass_vbr(cpi); else target = calc_pframe_target_size_one_pass_vbr(cpi); - av1_rc_set_frame_target(cpi, target); + rc_set_frame_target(cpi, target, cm->width, cm->height); } static int calc_pframe_target_size_one_pass_cbr(const AV1_COMP *cpi) { @@ -1496,7 +1550,7 @@ void av1_rc_get_one_pass_cbr_params(AV1_COMP *cpi) { else target = calc_pframe_target_size_one_pass_cbr(cpi); - av1_rc_set_frame_target(cpi, target); + rc_set_frame_target(cpi, target, cm->width, cm->height); // TODO(afergs): Decide whether to scale up, down, or not at all } @@ -1581,11 +1635,11 @@ void av1_rc_set_gf_interval_range(const AV1_COMP *const cpi, } } -void av1_rc_update_framerate(AV1_COMP *cpi) { - const AV1_COMMON *const cm = &cpi->common; +void av1_rc_update_framerate(AV1_COMP *cpi, int width, int height) { const AV1EncoderConfig *const oxcf = &cpi->oxcf; RATE_CONTROL *const rc = &cpi->rc; int vbr_max_bits; + const int MBs = av1_get_MBs(width, height); rc->avg_frame_bandwidth = (int)(oxcf->target_bandwidth / cpi->framerate); rc->min_frame_bandwidth = @@ -1605,7 +1659,7 @@ void av1_rc_update_framerate(AV1_COMP *cpi) { (int)(((int64_t)rc->avg_frame_bandwidth * oxcf->two_pass_vbrmax_section) / 100); rc->max_frame_bandwidth = - AOMMAX(AOMMAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits); + AOMMAX(AOMMAX((MBs * MAX_MB_RATE), MAXRATE_1080P), vbr_max_bits); av1_rc_set_gf_interval_range(cpi, rc); } @@ -1654,73 +1708,12 @@ static void vbr_rate_correction(AV1_COMP *cpi, int *this_frame_target) { } } -void av1_set_target_rate(AV1_COMP *cpi) { +void av1_set_target_rate(AV1_COMP *cpi, int width, int height) { RATE_CONTROL *const rc = &cpi->rc; int target_rate = rc->base_frame_target; // Correction to rate target based on prior over or under shoot. if (cpi->oxcf.rc_mode == AOM_VBR || cpi->oxcf.rc_mode == AOM_CQ) vbr_rate_correction(cpi, &target_rate); - av1_rc_set_frame_target(cpi, target_rate); -} - -static unsigned int lcg_rand16(unsigned int *state) { - *state = (unsigned int)(*state * 1103515245ULL + 12345); - return *state / 65536 % 32768; -} - -uint8_t av1_calculate_next_resize_scale(const AV1_COMP *cpi) { - static unsigned int seed = 56789; - const AV1EncoderConfig *oxcf = &cpi->oxcf; - if (oxcf->pass == 1) return SCALE_DENOMINATOR; - uint8_t new_num = SCALE_DENOMINATOR; - - switch (oxcf->resize_mode) { - case RESIZE_NONE: new_num = SCALE_DENOMINATOR; break; - case RESIZE_FIXED: - if (cpi->common.frame_type == KEY_FRAME) - new_num = oxcf->resize_kf_scale_numerator; - else - new_num = oxcf->resize_scale_numerator; - break; - case RESIZE_DYNAMIC: - // RESIZE_DYNAMIC: Just random for now. - new_num = lcg_rand16(&seed) % 4 + 13; - break; - default: assert(0); - } - return new_num; -} - -#if CONFIG_FRAME_SUPERRES -// TODO(afergs): Rename av1_rc_update_superres_scale(...)? -uint8_t av1_calculate_next_superres_scale(const AV1_COMP *cpi, int width, - int height) { - static unsigned int seed = 34567; - const AV1EncoderConfig *oxcf = &cpi->oxcf; - if (oxcf->pass == 1) return SCALE_DENOMINATOR; - uint8_t new_num = SCALE_DENOMINATOR; - - switch (oxcf->superres_mode) { - case SUPERRES_NONE: new_num = SCALE_DENOMINATOR; break; - case SUPERRES_FIXED: - if (cpi->common.frame_type == KEY_FRAME) - new_num = oxcf->superres_kf_scale_numerator; - else - new_num = oxcf->superres_scale_numerator; - break; - case SUPERRES_DYNAMIC: - // SUPERRES_DYNAMIC: Just random for now. - new_num = lcg_rand16(&seed) % 9 + 8; - break; - default: assert(0); - } - - // Make sure overall reduction is no more than 1/2 of the source size. - av1_calculate_scaled_size(&width, &height, new_num); - if (width * 2 < oxcf->width || height * 2 < oxcf->height) - new_num = SCALE_DENOMINATOR; - - return new_num; + rc_set_frame_target(cpi, target_rate, width, height); } -#endif // CONFIG_FRAME_SUPERRES |