759 lines
24 KiB
C
759 lines
24 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <limits.h>
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#include <assert.h>
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#include "math.h"
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#include "vp8/common/common.h"
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#include "ratectrl.h"
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#include "vp8/common/entropymode.h"
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#include "vpx_mem/vpx_mem.h"
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#include "vp8/common/systemdependent.h"
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#include "encodemv.h"
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#define MIN_BPB_FACTOR 0.005
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#define MAX_BPB_FACTOR 50
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extern const MB_PREDICTION_MODE vp8_mode_order[MAX_MODES];
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extern const MV_REFERENCE_FRAME vp8_ref_frame_order[MAX_MODES];
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#ifdef MODE_STATS
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extern int y_modes[VP8_YMODES];
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extern int uv_modes[VP8_UV_MODES];
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extern int b_modes[B_MODE_COUNT];
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extern int inter_y_modes[MB_MODE_COUNT];
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extern int inter_uv_modes[VP8_UV_MODES];
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extern int inter_b_modes[B_MODE_COUNT];
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#endif
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// Bits Per MB at different Q (Multiplied by 512)
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#define BPER_MB_NORMBITS 9
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// % adjustment to target kf size based on seperation from previous frame
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static const int kf_boost_seperation_adjustment[16] =
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{
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30, 40, 50, 55, 60, 65, 70, 75,
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80, 85, 90, 95, 100, 100, 100, 100,
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};
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static const int gf_adjust_table[101] =
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{
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100,
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115, 130, 145, 160, 175, 190, 200, 210, 220, 230,
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240, 260, 270, 280, 290, 300, 310, 320, 330, 340,
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350, 360, 370, 380, 390, 400, 400, 400, 400, 400,
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400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
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400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
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400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
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400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
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400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
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400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
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400, 400, 400, 400, 400, 400, 400, 400, 400, 400,
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};
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static const int gf_intra_usage_adjustment[20] =
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{
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125, 120, 115, 110, 105, 100, 95, 85, 80, 75,
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70, 65, 60, 55, 50, 50, 50, 50, 50, 50,
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};
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static const int gf_interval_table[101] =
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{
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7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
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11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
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};
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static const unsigned int prior_key_frame_weight[KEY_FRAME_CONTEXT] = { 1, 2, 3, 4, 5 };
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// These functions use formulaic calculations to make playing with the
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// quantizer tables easier. If necessary they can be replaced by lookup
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// tables if and when things settle down in the experimental bitstream
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double vp8_convert_qindex_to_q( int qindex )
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{
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// Convert the index to a real Q value (scaled down to match old Q values)
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return (double)vp8_ac_yquant( qindex, 0 ) / 4.0;
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}
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int vp8_gfboost_qadjust( int qindex )
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{
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int retval;
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double q;
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q = vp8_convert_qindex_to_q(qindex);
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retval = (int)( ( 0.00000828 * q * q * q ) +
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( -0.0055 * q * q ) +
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( 1.32 * q ) + 79.3 );
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return retval;
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}
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int kfboost_qadjust( int qindex )
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{
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int retval;
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double q;
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q = vp8_convert_qindex_to_q(qindex);
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retval = (int)( ( 0.00000973 * q * q * q ) +
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( -0.00613 * q * q ) +
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( 1.316 * q ) + 121.2 );
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return retval;
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}
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int vp8_bits_per_mb( FRAME_TYPE frame_type, int qindex )
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{
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if ( frame_type == KEY_FRAME )
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return (int)(4500000 / vp8_convert_qindex_to_q(qindex));
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else
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return (int)(2850000 / vp8_convert_qindex_to_q(qindex));
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}
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void vp8_save_coding_context(VP8_COMP *cpi)
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{
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CODING_CONTEXT *const cc = & cpi->coding_context;
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// Stores a snapshot of key state variables which can subsequently be
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// restored with a call to vp8_restore_coding_context. These functions are
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// intended for use in a re-code loop in vp8_compress_frame where the
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// quantizer value is adjusted between loop iterations.
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cc->frames_since_key = cpi->frames_since_key;
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cc->filter_level = cpi->common.filter_level;
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cc->frames_till_gf_update_due = cpi->frames_till_gf_update_due;
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cc->frames_since_golden = cpi->common.frames_since_golden;
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vp8_copy(cc->mvc, cpi->common.fc.mvc);
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vp8_copy(cc->mvcosts, cpi->mb.mvcosts);
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#if CONFIG_HIGH_PRECISION_MV
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vp8_copy(cc->mvc_hp, cpi->common.fc.mvc_hp);
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vp8_copy(cc->mvcosts_hp, cpi->mb.mvcosts_hp);
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#endif
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vp8_copy(cc->kf_ymode_prob, cpi->common.kf_ymode_prob);
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vp8_copy(cc->ymode_prob, cpi->common.fc.ymode_prob);
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vp8_copy(cc->kf_uv_mode_prob, cpi->common.kf_uv_mode_prob);
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vp8_copy(cc->uv_mode_prob, cpi->common.fc.uv_mode_prob);
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vp8_copy(cc->ymode_count, cpi->ymode_count);
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vp8_copy(cc->uv_mode_count, cpi->uv_mode_count);
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// Stats
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#ifdef MODE_STATS
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vp8_copy(cc->y_modes, y_modes);
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vp8_copy(cc->uv_modes, uv_modes);
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vp8_copy(cc->b_modes, b_modes);
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vp8_copy(cc->inter_y_modes, inter_y_modes);
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vp8_copy(cc->inter_uv_modes, inter_uv_modes);
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vp8_copy(cc->inter_b_modes, inter_b_modes);
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#endif
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cc->this_frame_percent_intra = cpi->this_frame_percent_intra;
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}
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void vp8_restore_coding_context(VP8_COMP *cpi)
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{
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CODING_CONTEXT *const cc = & cpi->coding_context;
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// Restore key state variables to the snapshot state stored in the
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// previous call to vp8_save_coding_context.
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cpi->frames_since_key = cc->frames_since_key;
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cpi->common.filter_level = cc->filter_level;
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cpi->frames_till_gf_update_due = cc->frames_till_gf_update_due;
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cpi->common.frames_since_golden = cc->frames_since_golden;
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vp8_copy(cpi->common.fc.mvc, cc->mvc);
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vp8_copy(cpi->mb.mvcosts, cc->mvcosts);
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#if CONFIG_HIGH_PRECISION_MV
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vp8_copy(cpi->common.fc.mvc_hp, cc->mvc_hp);
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vp8_copy(cpi->mb.mvcosts_hp, cc->mvcosts_hp);
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#endif
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vp8_copy(cpi->common.kf_ymode_prob, cc->kf_ymode_prob);
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vp8_copy(cpi->common.fc.ymode_prob, cc->ymode_prob);
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vp8_copy(cpi->common.kf_uv_mode_prob, cc->kf_uv_mode_prob);
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vp8_copy(cpi->common.fc.uv_mode_prob, cc->uv_mode_prob);
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vp8_copy(cpi->ymode_count, cc->ymode_count);
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vp8_copy(cpi->uv_mode_count, cc->uv_mode_count);
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// Stats
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#ifdef MODE_STATS
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vp8_copy(y_modes, cc->y_modes);
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vp8_copy(uv_modes, cc->uv_modes);
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vp8_copy(b_modes, cc->b_modes);
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vp8_copy(inter_y_modes, cc->inter_y_modes);
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vp8_copy(inter_uv_modes, cc->inter_uv_modes);
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vp8_copy(inter_b_modes, cc->inter_b_modes);
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#endif
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cpi->this_frame_percent_intra = cc->this_frame_percent_intra;
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}
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void vp8_setup_key_frame(VP8_COMP *cpi)
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{
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// Setup for Key frame:
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vp8_default_coef_probs(& cpi->common);
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vp8_kf_default_bmode_probs(cpi->common.kf_bmode_prob);
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vpx_memcpy(cpi->common.fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));
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{
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int flag[2] = {1, 1};
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vp8_build_component_cost_table(cpi->mb.mvcost, (const MV_CONTEXT *) cpi->common.fc.mvc, flag);
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}
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vpx_memset(cpi->common.fc.pre_mvc, 0, sizeof(cpi->common.fc.pre_mvc)); //initialize pre_mvc to all zero.
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#if CONFIG_HIGH_PRECISION_MV
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vpx_memcpy(cpi->common.fc.mvc_hp, vp8_default_mv_context_hp, sizeof(vp8_default_mv_context_hp));
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{
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int flag[2] = {1, 1};
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vp8_build_component_cost_table_hp(cpi->mb.mvcost_hp, (const MV_CONTEXT_HP *) cpi->common.fc.mvc_hp, flag);
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}
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vpx_memset(cpi->common.fc.pre_mvc_hp, 0, sizeof(cpi->common.fc.pre_mvc_hp)); //initialize pre_mvc to all zero.
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#endif
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cpi->common.txfm_mode = ONLY_4X4;
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//cpi->common.filter_level = 0; // Reset every key frame.
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cpi->common.filter_level = cpi->common.base_qindex * 3 / 8 ;
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// interval before next GF
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cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
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cpi->common.refresh_golden_frame = TRUE;
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cpi->common.refresh_alt_ref_frame = TRUE;
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vpx_memcpy(&cpi->common.lfc, &cpi->common.fc, sizeof(cpi->common.fc));
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vpx_memcpy(&cpi->common.lfc_a, &cpi->common.fc, sizeof(cpi->common.fc));
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vp8_init_mode_contexts(&cpi->common);
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vpx_memcpy( cpi->common.vp8_mode_contexts,
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cpi->common.mode_context,
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sizeof(cpi->common.mode_context));
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vpx_memcpy( cpi->common.vp8_mode_contexts,
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default_vp8_mode_contexts,
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sizeof(default_vp8_mode_contexts));
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}
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void vp8_setup_inter_frame(VP8_COMP *cpi)
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{
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if(cpi->common.Width * cpi->common.Height > 640*360)
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//||cpi->this_frame_target < 7 * cpi->common.MBs)
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cpi->common.txfm_mode = ALLOW_8X8;
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else
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cpi->common.txfm_mode = ONLY_4X4;
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if(cpi->common.refresh_alt_ref_frame)
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{
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vpx_memcpy( &cpi->common.fc,
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&cpi->common.lfc_a,
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sizeof(cpi->common.fc));
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vpx_memcpy( cpi->common.vp8_mode_contexts,
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cpi->common.mode_context_a,
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sizeof(cpi->common.vp8_mode_contexts));
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}
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else
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{
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vpx_memcpy( &cpi->common.fc,
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&cpi->common.lfc,
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sizeof(cpi->common.fc));
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vpx_memcpy( cpi->common.vp8_mode_contexts,
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cpi->common.mode_context,
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sizeof(cpi->common.vp8_mode_contexts));
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}
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}
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static int estimate_bits_at_q(int frame_kind, int Q, int MBs,
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double correction_factor)
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{
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int Bpm = (int)(.5 + correction_factor * vp8_bits_per_mb(frame_kind, Q));
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/* Attempt to retain reasonable accuracy without overflow. The cutoff is
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* chosen such that the maximum product of Bpm and MBs fits 31 bits. The
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* largest Bpm takes 20 bits.
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*/
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if (MBs > (1 << 11))
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return (Bpm >> BPER_MB_NORMBITS) * MBs;
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else
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return (Bpm * MBs) >> BPER_MB_NORMBITS;
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}
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static void calc_iframe_target_size(VP8_COMP *cpi)
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{
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// boost defaults to half second
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int kf_boost;
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int target;
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// Clear down mmx registers to allow floating point in what follows
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vp8_clear_system_state(); //__asm emms;
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// New Two pass RC
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target = cpi->per_frame_bandwidth;
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if (cpi->oxcf.rc_max_intra_bitrate_pct)
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{
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unsigned int max_rate = cpi->per_frame_bandwidth
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* cpi->oxcf.rc_max_intra_bitrate_pct / 100;
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if (target > max_rate)
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target = max_rate;
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}
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cpi->this_frame_target = target;
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}
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// Do the best we can to define the parameteres for the next GF based
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// on what information we have available.
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//
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// In this experimental code only two pass is supported
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// so we just use the interval determined in the two pass code.
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static void calc_gf_params(VP8_COMP *cpi)
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{
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// Set the gf interval
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cpi->frames_till_gf_update_due = cpi->baseline_gf_interval;
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}
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static void calc_pframe_target_size(VP8_COMP *cpi)
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{
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int min_frame_target;
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int Adjustment;
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min_frame_target = 0;
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min_frame_target = cpi->min_frame_bandwidth;
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if (min_frame_target < (cpi->av_per_frame_bandwidth >> 5))
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min_frame_target = cpi->av_per_frame_bandwidth >> 5;
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// Special alt reference frame case
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if (cpi->common.refresh_alt_ref_frame)
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{
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// Per frame bit target for the alt ref frame
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cpi->per_frame_bandwidth = cpi->twopass.gf_bits;
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cpi->this_frame_target = cpi->per_frame_bandwidth;
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}
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// Normal frames (gf,and inter)
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else
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{
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cpi->this_frame_target = cpi->per_frame_bandwidth;
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}
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// Sanity check that the total sum of adjustments is not above the maximum allowed
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// That is that having allowed for KF and GF penalties we have not pushed the
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// current interframe target to low. If the adjustment we apply here is not capable of recovering
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// all the extra bits we have spent in the KF or GF then the remainder will have to be recovered over
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// a longer time span via other buffer / rate control mechanisms.
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if (cpi->this_frame_target < min_frame_target)
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cpi->this_frame_target = min_frame_target;
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if (!cpi->common.refresh_alt_ref_frame)
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// Note the baseline target data rate for this inter frame.
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cpi->inter_frame_target = cpi->this_frame_target;
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// Adjust target frame size for Golden Frames:
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if ( cpi->frames_till_gf_update_due == 0 )
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{
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//int Boost = 0;
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int Q = (cpi->oxcf.fixed_q < 0) ? cpi->last_q[INTER_FRAME] : cpi->oxcf.fixed_q;
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cpi->common.refresh_golden_frame = TRUE;
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calc_gf_params(cpi);
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// If we are using alternate ref instead of gf then do not apply the boost
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// It will instead be applied to the altref update
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// Jims modified boost
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if (!cpi->source_alt_ref_active)
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{
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if (cpi->oxcf.fixed_q < 0)
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{
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// The spend on the GF is defined in the two pass code
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// for two pass encodes
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cpi->this_frame_target = cpi->per_frame_bandwidth;
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}
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else
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cpi->this_frame_target =
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(estimate_bits_at_q(1, Q, cpi->common.MBs, 1.0)
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* cpi->last_boost) / 100;
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}
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// If there is an active ARF at this location use the minimum
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// bits on this frame even if it is a contructed arf.
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// The active maximum quantizer insures that an appropriate
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// number of bits will be spent if needed for contstructed ARFs.
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else
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{
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cpi->this_frame_target = 0;
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}
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cpi->current_gf_interval = cpi->frames_till_gf_update_due;
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}
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}
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void vp8_update_rate_correction_factors(VP8_COMP *cpi, int damp_var)
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{
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int Q = cpi->common.base_qindex;
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int correction_factor = 100;
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double rate_correction_factor;
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double adjustment_limit;
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int projected_size_based_on_q = 0;
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// Clear down mmx registers to allow floating point in what follows
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vp8_clear_system_state(); //__asm emms;
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if (cpi->common.frame_type == KEY_FRAME)
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{
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rate_correction_factor = cpi->key_frame_rate_correction_factor;
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}
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else
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{
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if (cpi->common.refresh_alt_ref_frame || cpi->common.refresh_golden_frame)
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rate_correction_factor = cpi->gf_rate_correction_factor;
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else
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rate_correction_factor = cpi->rate_correction_factor;
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}
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// Work out how big we would have expected the frame to be at this Q given the current correction factor.
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// Stay in double to avoid int overflow when values are large
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projected_size_based_on_q =
|
|
(int)(((.5 + rate_correction_factor *
|
|
vp8_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 vp8_regulate_q(VP8_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 *
|
|
vp8_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(VP8_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 vp8_adjust_key_frame_context(VP8_COMP *cpi)
|
|
{
|
|
// Clear down mmx registers to allow floating point in what follows
|
|
vp8_clear_system_state();
|
|
|
|
cpi->frames_since_key = 0;
|
|
cpi->key_frame_count++;
|
|
}
|
|
|
|
|
|
void vp8_compute_frame_size_bounds(VP8_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 vp8_pick_frame_size(VP8_COMP *cpi)
|
|
{
|
|
VP8_COMMON *cm = &cpi->common;
|
|
|
|
if (cm->frame_type == KEY_FRAME)
|
|
calc_iframe_target_size(cpi);
|
|
else
|
|
calc_pframe_target_size(cpi);
|
|
|
|
return 1;
|
|
}
|