diff options
Diffstat (limited to 'vp8/encoder/ratectrl.c')
| -rw-r--r-- | vp8/encoder/ratectrl.c | 698 |
1 files changed, 0 insertions, 698 deletions
diff --git a/vp8/encoder/ratectrl.c b/vp8/encoder/ratectrl.c deleted file mode 100644 index 1ce5e0eb8..000000000 --- a/vp8/encoder/ratectrl.c +++ /dev/null @@ -1,698 +0,0 @@ -/* - * Copyright (c) 2010 The WebM project authors. All Rights Reserved. - * - * Use of this source code is governed by a BSD-style license - * that can be found in the LICENSE file in the root of the source - * tree. An additional intellectual property rights grant can be found - * in the file PATENTS. All contributing project authors may - * be found in the AUTHORS file in the root of the source tree. - */ - - -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <limits.h> -#include <assert.h> - -#include "math.h" -#include "vp8/common/alloccommon.h" -#include "vp8/common/common.h" -#include "ratectrl.h" -#include "vp8/common/entropymode.h" -#include "vpx_mem/vpx_mem.h" -#include "vp8/common/systemdependent.h" -#include "encodemv.h" -#include "vp8/common/quant_common.h" - -#define MIN_BPB_FACTOR 0.005 -#define MAX_BPB_FACTOR 50 - -#ifdef MODE_STATS -extern unsigned int y_modes[VP9_YMODES]; -extern unsigned int uv_modes[VP9_UV_MODES]; -extern unsigned int b_modes[B_MODE_COUNT]; - -extern unsigned int inter_y_modes[MB_MODE_COUNT]; -extern unsigned int inter_uv_modes[VP9_UV_MODES]; -extern unsigned int inter_b_modes[B_MODE_COUNT]; -#endif - -// Bits Per MB at different Q (Multiplied by 512) -#define BPER_MB_NORMBITS 9 - -// % adjustment to target kf size based on seperation from previous frame -static const int kf_boost_seperation_adjustment[16] = { - 30, 40, 50, 55, 60, 65, 70, 75, - 80, 85, 90, 95, 100, 100, 100, 100, -}; - -static const int gf_adjust_table[101] = { - 100, - 115, 130, 145, 160, 175, 190, 200, 210, 220, 230, - 240, 260, 270, 280, 290, 300, 310, 320, 330, 340, - 350, 360, 370, 380, 390, 400, 400, 400, 400, 400, - 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, - 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, - 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, - 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, - 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, - 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, - 400, 400, 400, 400, 400, 400, 400, 400, 400, 400, -}; - -static const int gf_intra_usage_adjustment[20] = { - 125, 120, 115, 110, 105, 100, 95, 85, 80, 75, - 70, 65, 60, 55, 50, 50, 50, 50, 50, 50, -}; - -static const int gf_interval_table[101] = { - 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, - 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, - 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, - 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, - 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, - 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, - 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, - 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, -}; - -static const unsigned int prior_key_frame_weight[KEY_FRAME_CONTEXT] = { 1, 2, 3, 4, 5 }; - -// These functions use formulaic calculations to make playing with the -// quantizer tables easier. If necessary they can be replaced by lookup -// tables if and when things settle down in the experimental bitstream -double vp9_convert_qindex_to_q(int qindex) { - // Convert the index to a real Q value (scaled down to match old Q values) - return (double)vp9_ac_yquant(qindex) / 4.0; -} - -int vp9_gfboost_qadjust(int qindex) { - int retval; - double q; - - q = vp9_convert_qindex_to_q(qindex); - retval = (int)((0.00000828 * q * q * q) + - (-0.0055 * q * q) + - (1.32 * q) + 79.3); - return retval; -} - -static int kfboost_qadjust(int qindex) { - int retval; - double q; - - q = vp9_convert_qindex_to_q(qindex); - retval = (int)((0.00000973 * q * q * q) + - (-0.00613 * q * q) + - (1.316 * q) + 121.2); - return retval; -} - -int vp9_bits_per_mb(FRAME_TYPE frame_type, int qindex) { - if (frame_type == KEY_FRAME) - return (int)(4500000 / vp9_convert_qindex_to_q(qindex)); - else - return (int)(2850000 / vp9_convert_qindex_to_q(qindex)); -} - - -void vp9_save_coding_context(VP9_COMP *cpi) { - CODING_CONTEXT *const cc = &cpi->coding_context; - VP9_COMMON *cm = &cpi->common; - MACROBLOCKD *xd = &cpi->mb.e_mbd; - - // Stores a snapshot of key state variables which can subsequently be - // restored with a call to vp9_restore_coding_context. These functions are - // intended for use in a re-code loop in vp9_compress_frame where the - // quantizer value is adjusted between loop iterations. - - cc->nmvc = cm->fc.nmvc; - vp9_copy(cc->nmvjointcost, cpi->mb.nmvjointcost); - vp9_copy(cc->nmvcosts, cpi->mb.nmvcosts); - vp9_copy(cc->nmvcosts_hp, cpi->mb.nmvcosts_hp); - - vp9_copy(cc->mv_ref_ct, cm->fc.mv_ref_ct); - vp9_copy(cc->mode_context, cm->fc.mode_context); - vp9_copy(cc->mv_ref_ct_a, cm->fc.mv_ref_ct_a); - vp9_copy(cc->mode_context_a, cm->fc.mode_context_a); - - vp9_copy(cc->ymode_prob, cm->fc.ymode_prob); - vp9_copy(cc->bmode_prob, cm->fc.bmode_prob); - vp9_copy(cc->uv_mode_prob, cm->fc.uv_mode_prob); - vp9_copy(cc->i8x8_mode_prob, cm->fc.i8x8_mode_prob); - vp9_copy(cc->sub_mv_ref_prob, cm->fc.sub_mv_ref_prob); - vp9_copy(cc->mbsplit_prob, cm->fc.mbsplit_prob); - - // Stats -#ifdef MODE_STATS - vp9_copy(cc->y_modes, y_modes); - vp9_copy(cc->uv_modes, uv_modes); - vp9_copy(cc->b_modes, b_modes); - vp9_copy(cc->inter_y_modes, inter_y_modes); - vp9_copy(cc->inter_uv_modes, inter_uv_modes); - vp9_copy(cc->inter_b_modes, inter_b_modes); -#endif - - vp9_copy(cc->segment_pred_probs, cm->segment_pred_probs); - vp9_copy(cc->ref_pred_probs_update, cpi->ref_pred_probs_update); - vp9_copy(cc->ref_pred_probs, cm->ref_pred_probs); - vp9_copy(cc->prob_comppred, cm->prob_comppred); - - vpx_memcpy(cpi->coding_context.last_frame_seg_map_copy, - cm->last_frame_seg_map, (cm->mb_rows * cm->mb_cols)); - - vp9_copy(cc->last_ref_lf_deltas, xd->last_ref_lf_deltas); - vp9_copy(cc->last_mode_lf_deltas, xd->last_mode_lf_deltas); - - vp9_copy(cc->coef_probs, cm->fc.coef_probs); - vp9_copy(cc->hybrid_coef_probs, cm->fc.hybrid_coef_probs); - vp9_copy(cc->coef_probs_8x8, cm->fc.coef_probs_8x8); - vp9_copy(cc->hybrid_coef_probs_8x8, cm->fc.hybrid_coef_probs_8x8); - vp9_copy(cc->coef_probs_16x16, cm->fc.coef_probs_16x16); - vp9_copy(cc->hybrid_coef_probs_16x16, cm->fc.hybrid_coef_probs_16x16); - vp9_copy(cc->switchable_interp_prob, cm->fc.switchable_interp_prob); -} - -void vp9_restore_coding_context(VP9_COMP *cpi) { - CODING_CONTEXT *const cc = &cpi->coding_context; - VP9_COMMON *cm = &cpi->common; - MACROBLOCKD *xd = &cpi->mb.e_mbd; - - // Restore key state variables to the snapshot state stored in the - // previous call to vp9_save_coding_context. - - cm->fc.nmvc = cc->nmvc; - vp9_copy(cpi->mb.nmvjointcost, cc->nmvjointcost); - vp9_copy(cpi->mb.nmvcosts, cc->nmvcosts); - vp9_copy(cpi->mb.nmvcosts_hp, cc->nmvcosts_hp); - - vp9_copy(cm->fc.mv_ref_ct, cc->mv_ref_ct); - vp9_copy(cm->fc.mode_context, cc->mode_context); - vp9_copy(cm->fc.mv_ref_ct_a, cc->mv_ref_ct_a); - vp9_copy(cm->fc.mode_context_a, cc->mode_context_a); - - vp9_copy(cm->fc.ymode_prob, cc->ymode_prob); - vp9_copy(cm->fc.bmode_prob, cc->bmode_prob); - vp9_copy(cm->fc.i8x8_mode_prob, cc->i8x8_mode_prob); - vp9_copy(cm->fc.uv_mode_prob, cc->uv_mode_prob); - vp9_copy(cm->fc.sub_mv_ref_prob, cc->sub_mv_ref_prob); - vp9_copy(cm->fc.mbsplit_prob, cc->mbsplit_prob); - - // Stats -#ifdef MODE_STATS - vp9_copy(y_modes, cc->y_modes); - vp9_copy(uv_modes, cc->uv_modes); - vp9_copy(b_modes, cc->b_modes); - vp9_copy(inter_y_modes, cc->inter_y_modes); - vp9_copy(inter_uv_modes, cc->inter_uv_modes); - vp9_copy(inter_b_modes, cc->inter_b_modes); -#endif - - vp9_copy(cm->segment_pred_probs, cc->segment_pred_probs); - vp9_copy(cpi->ref_pred_probs_update, cc->ref_pred_probs_update); - vp9_copy(cm->ref_pred_probs, cc->ref_pred_probs); - vp9_copy(cm->prob_comppred, cc->prob_comppred); - - vpx_memcpy(cm->last_frame_seg_map, - cpi->coding_context.last_frame_seg_map_copy, - (cm->mb_rows * cm->mb_cols)); - - vp9_copy(xd->last_ref_lf_deltas, cc->last_ref_lf_deltas); - vp9_copy(xd->last_mode_lf_deltas, cc->last_mode_lf_deltas); - - vp9_copy(cm->fc.coef_probs, cc->coef_probs); - vp9_copy(cm->fc.hybrid_coef_probs, cc->hybrid_coef_probs); - vp9_copy(cm->fc.coef_probs_8x8, cc->coef_probs_8x8); - vp9_copy(cm->fc.hybrid_coef_probs_8x8, cc->hybrid_coef_probs_8x8); - vp9_copy(cm->fc.coef_probs_16x16, cc->coef_probs_16x16); - vp9_copy(cm->fc.hybrid_coef_probs_16x16, cc->hybrid_coef_probs_16x16); - vp9_copy(cm->fc.switchable_interp_prob, cc->switchable_interp_prob); -} - - -void vp9_setup_key_frame(VP9_COMP *cpi) { - VP9_COMMON *cm = &cpi->common; - // Setup for Key frame: - vp9_default_coef_probs(& cpi->common); - vp9_kf_default_bmode_probs(cpi->common.kf_bmode_prob); - vp9_init_mbmode_probs(& cpi->common); - vp9_default_bmode_probs(cm->fc.bmode_prob); - - vp9_init_mv_probs(& cpi->common); - - // cpi->common.filter_level = 0; // Reset every key frame. - cpi->common.filter_level = cpi->common.base_qindex * 3 / 8; - - // interval before next GF - cpi->frames_till_gf_update_due = cpi->baseline_gf_interval; - - cpi->common.refresh_golden_frame = TRUE; - cpi->common.refresh_alt_ref_frame = TRUE; - - vp9_init_mode_contexts(&cpi->common); - vpx_memcpy(&cpi->common.lfc, &cpi->common.fc, sizeof(cpi->common.fc)); - vpx_memcpy(&cpi->common.lfc_a, &cpi->common.fc, sizeof(cpi->common.fc)); - - vpx_memset(cm->prev_mip, 0, - (cm->mb_cols + 1) * (cm->mb_rows + 1)* sizeof(MODE_INFO)); - vpx_memset(cm->mip, 0, - (cm->mb_cols + 1) * (cm->mb_rows + 1)* sizeof(MODE_INFO)); - - vp9_update_mode_info_border(cm, cm->mip); - vp9_update_mode_info_in_image(cm, cm->mi); -} - -void vp9_setup_inter_frame(VP9_COMP *cpi) { - if (cpi->common.refresh_alt_ref_frame) { - vpx_memcpy(&cpi->common.fc, - &cpi->common.lfc_a, - sizeof(cpi->common.fc)); - vpx_memcpy(cpi->common.fc.vp8_mode_contexts, - cpi->common.fc.mode_context_a, - sizeof(cpi->common.fc.vp8_mode_contexts)); - } else { - vpx_memcpy(&cpi->common.fc, - &cpi->common.lfc, - sizeof(cpi->common.fc)); - vpx_memcpy(cpi->common.fc.vp8_mode_contexts, - cpi->common.fc.mode_context, - sizeof(cpi->common.fc.vp8_mode_contexts)); - } -} - - -static int estimate_bits_at_q(int frame_kind, int Q, int MBs, - double correction_factor) { - int Bpm = (int)(.5 + correction_factor * vp9_bits_per_mb(frame_kind, Q)); - - /* Attempt to retain reasonable accuracy without overflow. The cutoff is - * chosen such that the maximum product of Bpm and MBs fits 31 bits. The - * largest Bpm takes 20 bits. - */ - if (MBs > (1 << 11)) - return (Bpm >> BPER_MB_NORMBITS) * MBs; - else - return (Bpm * MBs) >> BPER_MB_NORMBITS; -} - - -static void calc_iframe_target_size(VP9_COMP *cpi) { - // boost defaults to half second - int target; - - // Clear down mmx registers to allow floating point in what follows - vp9_clear_system_state(); // __asm emms; - - // New Two pass RC - target = cpi->per_frame_bandwidth; - - if (cpi->oxcf.rc_max_intra_bitrate_pct) { - unsigned int max_rate = cpi->per_frame_bandwidth - * cpi->oxcf.rc_max_intra_bitrate_pct / 100; - - if (target > max_rate) - target = max_rate; - } - - cpi->this_frame_target = target; - -} - - -// Do the best we can to define the parameteres for the next GF based -// on what information we have available. -// -// In this experimental code only two pass is supported -// so we just use the interval determined in the two pass code. -static void calc_gf_params(VP9_COMP *cpi) { - // Set the gf interval - cpi->frames_till_gf_update_due = cpi->baseline_gf_interval; -} - - -static void calc_pframe_target_size(VP9_COMP *cpi) { - int min_frame_target; - - min_frame_target = 0; - - min_frame_target = cpi->min_frame_bandwidth; - - if (min_frame_target < (cpi->av_per_frame_bandwidth >> 5)) - min_frame_target = cpi->av_per_frame_bandwidth >> 5; - - - // Special alt reference frame case - if (cpi->common.refresh_alt_ref_frame) { - // Per frame bit target for the alt ref frame - cpi->per_frame_bandwidth = cpi->twopass.gf_bits; - cpi->this_frame_target = cpi->per_frame_bandwidth; - } - - // Normal frames (gf,and inter) - else { - cpi->this_frame_target = cpi->per_frame_bandwidth; - } - - // Sanity check that the total sum of adjustments is not above the maximum allowed - // That is that having allowed for KF and GF penalties we have not pushed the - // current interframe target to low. If the adjustment we apply here is not capable of recovering - // all the extra bits we have spent in the KF or GF then the remainder will have to be recovered over - // a longer time span via other buffer / rate control mechanisms. - if (cpi->this_frame_target < min_frame_target) - cpi->this_frame_target = min_frame_target; - - if (!cpi->common.refresh_alt_ref_frame) - // Note the baseline target data rate for this inter frame. - cpi->inter_frame_target = cpi->this_frame_target; - - // Adjust target frame size for Golden Frames: - if (cpi->frames_till_gf_update_due == 0) { - // int Boost = 0; - int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q; - - cpi->common.refresh_golden_frame = TRUE; - - calc_gf_params(cpi); - - // If we are using alternate ref instead of gf then do not apply the boost - // It will instead be applied to the altref update - // Jims modified boost - if (!cpi->source_alt_ref_active) { - if (cpi->oxcf.fixed_q < 0) { - // The spend on the GF is defined in the two pass code - // for two pass encodes - cpi->this_frame_target = cpi->per_frame_bandwidth; - } else - cpi->this_frame_target = - (estimate_bits_at_q(1, Q, cpi->common.MBs, 1.0) - * cpi->last_boost) / 100; - - } - // If there is an active ARF at this location use the minimum - // bits on this frame even if it is a contructed arf. - // The active maximum quantizer insures that an appropriate - // number of bits will be spent if needed for contstructed ARFs. - else { - cpi->this_frame_target = 0; - } - - cpi->current_gf_interval = cpi->frames_till_gf_update_due; - } -} - - -void vp9_update_rate_correction_factors(VP9_COMP *cpi, int damp_var) { - int Q = cpi->common.base_qindex; - int correction_factor = 100; - double rate_correction_factor; - double adjustment_limit; - - int projected_size_based_on_q = 0; - - // Clear down mmx registers to allow floating point in what follows - vp9_clear_system_state(); // __asm emms; - - if (cpi->common.frame_type == KEY_FRAME) { - rate_correction_factor = cpi->key_frame_rate_correction_factor; - } else { - if (cpi->common.refresh_alt_ref_frame || cpi->common.refresh_golden_frame) - rate_correction_factor = cpi->gf_rate_correction_factor; - else - rate_correction_factor = cpi->rate_correction_factor; - } - - // Work out how big we would have expected the frame to be at this Q given the current correction factor. - // Stay in double to avoid int overflow when values are large - projected_size_based_on_q = - (int)(((.5 + rate_correction_factor * - vp9_bits_per_mb(cpi->common.frame_type, Q)) * - cpi->common.MBs) / (1 << BPER_MB_NORMBITS)); - - // Make some allowance for cpi->zbin_over_quant - if (cpi->zbin_over_quant > 0) { - int Z = cpi->zbin_over_quant; - double Factor = 0.99; - double factor_adjustment = 0.01 / 256.0; // (double)ZBIN_OQ_MAX; - - while (Z > 0) { - Z--; - projected_size_based_on_q = - (int)(Factor * projected_size_based_on_q); - Factor += factor_adjustment; - - if (Factor >= 0.999) - Factor = 0.999; - } - } - - // Work out a size correction factor. - // if ( cpi->this_frame_target > 0 ) - // correction_factor = (100 * cpi->projected_frame_size) / cpi->this_frame_target; - if (projected_size_based_on_q > 0) - correction_factor = (100 * cpi->projected_frame_size) / projected_size_based_on_q; - - // More heavily damped adjustment used if we have been oscillating either side of target - switch (damp_var) { - case 0: - adjustment_limit = 0.75; - break; - case 1: - adjustment_limit = 0.375; - break; - case 2: - default: - adjustment_limit = 0.25; - break; - } - - // if ( (correction_factor > 102) && (Q < cpi->active_worst_quality) ) - if (correction_factor > 102) { - // We are not already at the worst allowable quality - correction_factor = (int)(100.5 + ((correction_factor - 100) * adjustment_limit)); - rate_correction_factor = ((rate_correction_factor * correction_factor) / 100); - - // Keep rate_correction_factor within limits - if (rate_correction_factor > MAX_BPB_FACTOR) - rate_correction_factor = MAX_BPB_FACTOR; - } - // else if ( (correction_factor < 99) && (Q > cpi->active_best_quality) ) - else if (correction_factor < 99) { - // We are not already at the best allowable quality - correction_factor = (int)(100.5 - ((100 - correction_factor) * adjustment_limit)); - rate_correction_factor = ((rate_correction_factor * correction_factor) / 100); - - // Keep rate_correction_factor within limits - if (rate_correction_factor < MIN_BPB_FACTOR) - rate_correction_factor = MIN_BPB_FACTOR; - } - - if (cpi->common.frame_type == KEY_FRAME) - cpi->key_frame_rate_correction_factor = rate_correction_factor; - else { - if (cpi->common.refresh_alt_ref_frame || cpi->common.refresh_golden_frame) - cpi->gf_rate_correction_factor = rate_correction_factor; - else - cpi->rate_correction_factor = rate_correction_factor; - } -} - - -int vp9_regulate_q(VP9_COMP *cpi, int target_bits_per_frame) { - int Q = cpi->active_worst_quality; - - int i; - int last_error = INT_MAX; - int target_bits_per_mb; - int bits_per_mb_at_this_q; - double correction_factor; - - // Reset Zbin OQ value - cpi->zbin_over_quant = 0; - - // Select the appropriate correction factor based upon type of frame. - if (cpi->common.frame_type == KEY_FRAME) - correction_factor = cpi->key_frame_rate_correction_factor; - else { - if (cpi->common.refresh_alt_ref_frame || cpi->common.refresh_golden_frame) - correction_factor = cpi->gf_rate_correction_factor; - else - correction_factor = cpi->rate_correction_factor; - } - - // Calculate required scaling factor based on target frame size and size of frame produced using previous Q - if (target_bits_per_frame >= (INT_MAX >> BPER_MB_NORMBITS)) - target_bits_per_mb = (target_bits_per_frame / cpi->common.MBs) << BPER_MB_NORMBITS; // Case where we would overflow int - else - target_bits_per_mb = (target_bits_per_frame << BPER_MB_NORMBITS) / cpi->common.MBs; - - i = cpi->active_best_quality; - - do { - bits_per_mb_at_this_q = - (int)(.5 + correction_factor * - vp9_bits_per_mb(cpi->common.frame_type, i)); - - if (bits_per_mb_at_this_q <= target_bits_per_mb) { - if ((target_bits_per_mb - bits_per_mb_at_this_q) <= last_error) - Q = i; - else - Q = i - 1; - - break; - } else - last_error = bits_per_mb_at_this_q - target_bits_per_mb; - } while (++i <= cpi->active_worst_quality); - - - // If we are at MAXQ then enable Q over-run which seeks to claw back additional bits through things like - // the RD multiplier and zero bin size. - if (Q >= MAXQ) { - int zbin_oqmax; - - double Factor = 0.99; - double factor_adjustment = 0.01 / 256.0; // (double)ZBIN_OQ_MAX; - - if (cpi->common.frame_type == KEY_FRAME) - zbin_oqmax = 0; // ZBIN_OQ_MAX/16 - else if (cpi->common.refresh_alt_ref_frame || (cpi->common.refresh_golden_frame && !cpi->source_alt_ref_active)) - zbin_oqmax = 16; - else - zbin_oqmax = ZBIN_OQ_MAX; - - // Each incrment in the zbin is assumed to have a fixed effect on bitrate. This is not of course true. - // The effect will be highly clip dependent and may well have sudden steps. - // The idea here is to acheive higher effective quantizers than the normal maximum by expanding the zero - // bin and hence decreasing the number of low magnitude non zero coefficients. - while (cpi->zbin_over_quant < zbin_oqmax) { - cpi->zbin_over_quant++; - - if (cpi->zbin_over_quant > zbin_oqmax) - cpi->zbin_over_quant = zbin_oqmax; - - // Adjust bits_per_mb_at_this_q estimate - bits_per_mb_at_this_q = (int)(Factor * bits_per_mb_at_this_q); - Factor += factor_adjustment; - - if (Factor >= 0.999) - Factor = 0.999; - - if (bits_per_mb_at_this_q <= target_bits_per_mb) // Break out if we get down to the target rate - break; - } - - } - - return Q; -} - - -static int estimate_keyframe_frequency(VP9_COMP *cpi) { - int i; - - // Average key frame frequency - int av_key_frame_frequency = 0; - - /* First key frame at start of sequence is a special case. We have no - * frequency data. - */ - if (cpi->key_frame_count == 1) { - /* Assume a default of 1 kf every 2 seconds, or the max kf interval, - * whichever is smaller. - */ - int key_freq = cpi->oxcf.key_freq > 0 ? cpi->oxcf.key_freq : 1; - av_key_frame_frequency = (int)cpi->output_frame_rate * 2; - - if (cpi->oxcf.auto_key && av_key_frame_frequency > key_freq) - av_key_frame_frequency = cpi->oxcf.key_freq; - - cpi->prior_key_frame_distance[KEY_FRAME_CONTEXT - 1] - = av_key_frame_frequency; - } else { - unsigned int total_weight = 0; - int last_kf_interval = - (cpi->frames_since_key > 0) ? cpi->frames_since_key : 1; - - /* reset keyframe context and calculate weighted average of last - * KEY_FRAME_CONTEXT keyframes - */ - for (i = 0; i < KEY_FRAME_CONTEXT; i++) { - if (i < KEY_FRAME_CONTEXT - 1) - cpi->prior_key_frame_distance[i] - = cpi->prior_key_frame_distance[i + 1]; - else - cpi->prior_key_frame_distance[i] = last_kf_interval; - - av_key_frame_frequency += prior_key_frame_weight[i] - * cpi->prior_key_frame_distance[i]; - total_weight += prior_key_frame_weight[i]; - } - - av_key_frame_frequency /= total_weight; - - } - return av_key_frame_frequency; -} - - -void vp9_adjust_key_frame_context(VP9_COMP *cpi) { - // Clear down mmx registers to allow floating point in what follows - vp9_clear_system_state(); - - cpi->frames_since_key = 0; - cpi->key_frame_count++; -} - - -void vp9_compute_frame_size_bounds(VP9_COMP *cpi, int *frame_under_shoot_limit, - int *frame_over_shoot_limit) { - // Set-up bounds on acceptable frame size: - if (cpi->oxcf.fixed_q >= 0) { - // Fixed Q scenario: frame size never outranges target (there is no target!) - *frame_under_shoot_limit = 0; - *frame_over_shoot_limit = INT_MAX; - } else { - if (cpi->common.frame_type == KEY_FRAME) { - *frame_over_shoot_limit = cpi->this_frame_target * 9 / 8; - *frame_under_shoot_limit = cpi->this_frame_target * 7 / 8; - } else { - if (cpi->common.refresh_alt_ref_frame || cpi->common.refresh_golden_frame) { - *frame_over_shoot_limit = cpi->this_frame_target * 9 / 8; - *frame_under_shoot_limit = cpi->this_frame_target * 7 / 8; - } else { - // Stron overshoot limit for constrained quality - if (cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY) { - *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8; - *frame_under_shoot_limit = cpi->this_frame_target * 2 / 8; - } else { - *frame_over_shoot_limit = cpi->this_frame_target * 11 / 8; - *frame_under_shoot_limit = cpi->this_frame_target * 5 / 8; - } - } - } - - // For very small rate targets where the fractional adjustment - // (eg * 7/8) may be tiny make sure there is at least a minimum - // range. - *frame_over_shoot_limit += 200; - *frame_under_shoot_limit -= 200; - if (*frame_under_shoot_limit < 0) - *frame_under_shoot_limit = 0; - } -} - - -// return of 0 means drop frame -int vp9_pick_frame_size(VP9_COMP *cpi) { - VP9_COMMON *cm = &cpi->common; - - if (cm->frame_type == KEY_FRAME) - calc_iframe_target_size(cpi); - else - calc_pframe_target_size(cpi); - - return 1; -} |