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https://github.com/mpv-player/mpv
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305 lines
10 KiB
C
305 lines
10 KiB
C
/*
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* GTF calculations formulas are taken from GTF_V1R1.xls
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* created by ANDY.MORRISH@NSC.COM
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*
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* copyright (C) 2002 Rudolf Marek <r.marek@assembler.cz>
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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//Version 0.4
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include "gtf.h"
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#undef GTF_DEBUG
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#ifdef GTF_DEBUG
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#define DEBUG_PRINTF(a,b) printf(a,b);
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#else
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#define DEBUG_PRINTF(a,b)
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#endif
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static GTF_constants GTF_given_constants = { 3.0,550.0,1,8,1.8,8,40,20,128,600 };
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static void GetRoundedConstants(GTF_constants *c)
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{
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c->Vsync_need = round(GTF_given_constants.Vsync_need);
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c->min_Vsync_BP = GTF_given_constants.min_Vsync_BP;
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c->min_front_porch = round(GTF_given_constants.min_front_porch);
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c->char_cell_granularity = GTF_given_constants.char_cell_granularity;
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c->margin_width = GTF_given_constants.margin_width;
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c->sync_width = GTF_given_constants.sync_width;
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c->c = ((GTF_given_constants.c - GTF_given_constants.j)*(GTF_given_constants.k / 256)) + GTF_given_constants.j;
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c->j = GTF_given_constants.j;
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c->k = GTF_given_constants.k;
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c->m = (GTF_given_constants.k / 256) * GTF_given_constants.m;
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}
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void GTF_calcTimings(double X,double Y,double freq, int type,
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int want_margins, int want_interlace,struct VesaCRTCInfoBlock *result )
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{
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GTF_constants c;
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double RR, margin_top, margin_bottom, margin_left, margin_right;
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double estimated_H_period,sync_plus_BP,BP,interlace,V_total_lines_field;
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double estimated_V_field_rate,actual_H_period,actual_V_field_freq;
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double total_active_pixels, ideal_duty_cycle, blanking_time, H_total_pixels;
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double H_freq, pixel_freq,actual_V_frame_freq;
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double H_sync_start, H_sync_end, H_back_porch, H_front_porch, H_sync_width;
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double V_back_porch, V_front_porch, V_sync_start, V_sync_end,V_sync_width;
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double ideal_H_period;
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GetRoundedConstants(&c);
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pixel_freq = RR = freq;
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/* DETERMINE IF 1/2 LINE INTERLACE IS PRESENT */
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interlace = 0;
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if (want_interlace) {
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RR = RR * 2;
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Y=Y/2;
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interlace = 0.5;
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}
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result->Flags = 0;
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if ((Y==300)||(Y==200)||(Y==240))
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{
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Y*=2;
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result->Flags = VESA_CRTC_DOUBLESCAN; /* TODO: check if mode support */
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}
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/* DETERMINE NUMBER OF LINES IN V MARGIN */
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/* DETERMINE NUMBER OF PIXELS IN H MARGIN [pixels] */
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margin_left = margin_right = 0;
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margin_top = margin_bottom = 0;
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if (want_margins) {
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margin_top = margin_bottom = (c.margin_width / 100) * Y;
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margin_left = round(( X* c.margin_width/100)/c.char_cell_granularity) \
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* c.char_cell_granularity;
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margin_right = margin_left;
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DEBUG_PRINTF("margin_left_right : %f\n",margin_right)
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DEBUG_PRINTF("margin_top_bottom : %f\n",margin_top)
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}
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/* FIND TOTAL NUMBER OF ACTIVE PIXELS (IMAGE + MARGIN) [pixels] */
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total_active_pixels = margin_left + margin_right + X;
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DEBUG_PRINTF("total_active_pixels: %f\n",total_active_pixels)
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if (type == GTF_PF)
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{
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ideal_H_period = ((c.c-100)+(sqrt(((100-c.c)*(100-c.c) )+(0.4*c.m*(total_active_pixels + margin_left + margin_right) / freq))))/2/c.m*1000;
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DEBUG_PRINTF("ideal_H_period: %f\n",ideal_H_period)
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/* FIND IDEAL BLANKING DUTY CYCLE FROM FORMULA [%] */
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ideal_duty_cycle = c.c - (c.m * ideal_H_period /1000);
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DEBUG_PRINTF("ideal_duty_cycle: %f\n",ideal_duty_cycle)
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/* FIND BLANKING TIME (TO NEAREST CHAR CELL) [pixels] */
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blanking_time = round(total_active_pixels * ideal_duty_cycle \
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/ (100-ideal_duty_cycle) / (2*c.char_cell_granularity)) \
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* (2*c.char_cell_granularity);
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DEBUG_PRINTF("blanking_time : %f\n",blanking_time )
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/* FIND TOTAL NUMBER OF PIXELS IN A LINE [pixels] */
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H_total_pixels = total_active_pixels + blanking_time ;
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DEBUG_PRINTF("H_total_pixels: %f\n",H_total_pixels)
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H_freq = freq / H_total_pixels * 1000;
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DEBUG_PRINTF("H_freq: %f\n",H_freq)
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actual_H_period = 1000 / H_freq;
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DEBUG_PRINTF("actual_H_period: %f\n",actual_H_period)
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sync_plus_BP = round(H_freq * c.min_Vsync_BP/1000);
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// sync_plus_BP = round( freq / H_total_pixels * c.min_Vsync_BP);
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DEBUG_PRINTF("sync_plus_BP: %f\n",sync_plus_BP)
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} else if (type == GTF_VF)
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{
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/* ESTIMATE HORIZ. PERIOD [us] */
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estimated_H_period = (( 1/RR ) - c.min_Vsync_BP/1000000 ) / (Y + (2 * margin_top) + c.min_front_porch + interlace) * 1000000;
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DEBUG_PRINTF("estimated_H_period: %f\n",estimated_H_period)
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/* FIND NUMBER OF LINES IN (SYNC + BACK PORCH) [lines] */
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sync_plus_BP = round( c.min_Vsync_BP / estimated_H_period );
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DEBUG_PRINTF("sync_plus_BP: %f\n",sync_plus_BP)
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} else if (type == GTF_HF)
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{
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sync_plus_BP = round(freq * c.min_Vsync_BP/1000);
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DEBUG_PRINTF("sync_plus_BP: %f\n",sync_plus_BP)
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}
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/* FIND TOTAL NUMBER OF LINES IN VERTICAL FIELD */
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V_total_lines_field = sync_plus_BP+interlace+margin_bottom+margin_top+Y+c.min_front_porch;
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DEBUG_PRINTF("V_total_lines_field : %f\n",V_total_lines_field )
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if (type == GTF_VF)
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{
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/* ESTIMATE VERTICAL FIELD RATE [hz] */
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estimated_V_field_rate = 1 / estimated_H_period / V_total_lines_field * 1000000;
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DEBUG_PRINTF(" estimated_V_field_rate: %f\n", estimated_V_field_rate)
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/* FIND ACTUAL HORIZONTAL PERIOD [us] */
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actual_H_period = estimated_H_period / (RR / estimated_V_field_rate);
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DEBUG_PRINTF("actual_H_period: %f\n",actual_H_period)
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/* FIND ACTUAL VERTICAL FIELD FREQUENCY [Hz] */
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actual_V_field_freq = 1 / actual_H_period / V_total_lines_field * 1000000;
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DEBUG_PRINTF("actual_V_field_freq: %f\n",actual_V_field_freq)
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/* FIND IDEAL BLANKING DUTY CYCLE FROM FORMULA [%] */
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ideal_duty_cycle = c.c - (c.m * actual_H_period /1000);
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DEBUG_PRINTF("ideal_duty_cycle: %f\n",ideal_duty_cycle)
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//if (type == GTF_VF)
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//{
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//moved
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//}
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} else if (type == GTF_HF)
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{
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/* FIND IDEAL BLANKING DUTY CYCLE FROM FORMULA [%] */
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ideal_duty_cycle = c.c - (c.m / freq);
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DEBUG_PRINTF("ideal_duty_cycle: %f\n",ideal_duty_cycle)
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}
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/* FIND BLANKING TIME (TO NEAREST CHAR CELL) [pixels] */
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if (!(type == GTF_PF))
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{
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blanking_time = round(total_active_pixels * ideal_duty_cycle \
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/ (100-ideal_duty_cycle) / (2*c.char_cell_granularity)) \
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* (2*c.char_cell_granularity);
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DEBUG_PRINTF("blanking_time : %f\n",blanking_time )
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}
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else
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// if (type == GTF_PF)
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{
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actual_V_field_freq = H_freq / V_total_lines_field * 1000;
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}
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if (type == GTF_HF)
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{
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/* Hz */
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actual_V_field_freq = freq / V_total_lines_field * 1000;
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DEBUG_PRINTF("actual_V_field_freq: %f\n",actual_V_field_freq)
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}
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actual_V_frame_freq = actual_V_field_freq;
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/* FIND ACTUAL VERTICAL FRAME FREQUENCY [Hz]*/
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if (want_interlace) actual_V_frame_freq = actual_V_field_freq / 2;
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DEBUG_PRINTF("actual_V_frame_freq: %f\n",actual_V_frame_freq)
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// V_freq = actual_V_frame_freq;
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// DEBUG_PRINTF("V_freq %f\n",V_freq)
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if (!(type == GTF_PF))
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{
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/* FIND TOTAL NUMBER OF PIXELS IN A LINE [pixels] */
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H_total_pixels = total_active_pixels + blanking_time ;
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DEBUG_PRINTF("H_total_pixels: %f\n",H_total_pixels)
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if (type == GTF_VF)
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{
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/* FIND PIXEL FREQUENCY [Mhz] */
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pixel_freq = H_total_pixels / actual_H_period ;
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DEBUG_PRINTF("pixel_freq: %f\n",pixel_freq)
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} else if (type == GTF_HF)
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{
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/* FIND PIXEL FREQUENCY [Mhz] */
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pixel_freq = H_total_pixels * freq / 1000 ;
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DEBUG_PRINTF("pixel_freq: %f\n",pixel_freq)
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actual_H_period = 1000/freq;
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}
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/* FIND ACTUAL HORIZONTAL FREQUENCY [KHz] */
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H_freq = 1000 / actual_H_period;
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DEBUG_PRINTF("H_freq %f\n",H_freq)
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}
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/* FIND NUMBER OF LINES IN BACK PORCH [lines] */
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BP = sync_plus_BP - c.Vsync_need;
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DEBUG_PRINTF("BP: %f\n",BP)
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/*------------------------------------------------------------------------------------------------*/
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/* FIND H SYNC WIDTH (TO NEAREST CHAR CELL) */
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H_sync_width = round(c.sync_width/100*H_total_pixels/c.char_cell_granularity)*c.char_cell_granularity;
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DEBUG_PRINTF("H_sync_width %f\n",H_sync_width)
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/* FIND FRONT H PORCH(TO NEAREST CHAR CELL) */
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H_front_porch = (blanking_time/2) - H_sync_width;
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DEBUG_PRINTF("H_front_porch %f\n",H_front_porch)
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/* FIND BACK H PORCH(TO NEAREST CHAR CELL) */
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H_back_porch = H_sync_width + H_front_porch;
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DEBUG_PRINTF("H_back_porch%f\n",H_back_porch)
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H_sync_start = H_total_pixels - (H_sync_width + H_back_porch);
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DEBUG_PRINTF("H_sync_start %f\n",H_sync_start)
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H_sync_end = H_total_pixels - H_back_porch;
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DEBUG_PRINTF("H_sync_end %f\n",H_sync_end)
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V_back_porch = interlace + BP;
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DEBUG_PRINTF("V_back_porch%f\n",V_back_porch)
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V_front_porch = interlace + c.min_front_porch;
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DEBUG_PRINTF("V_front_porch%f\n",V_front_porch)
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V_sync_width = c.Vsync_need;
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V_sync_start = V_total_lines_field - (V_sync_width + V_back_porch);
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DEBUG_PRINTF("V_sync_start %f\n",V_sync_start)
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V_sync_end = V_total_lines_field - V_back_porch;
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DEBUG_PRINTF("V_sync_end %f\n",V_sync_end)
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result->hTotal = H_total_pixels;
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result-> hSyncStart = H_sync_start; /* Horizontal sync start in pixels */
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result-> hSyncEnd = H_sync_end; /* Horizontal sync end in pixels */
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result-> vTotal= V_total_lines_field; /* Vertical total in lines */
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result-> vSyncStart = V_sync_start; /* Vertical sync start in lines */
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result-> vSyncEnd = V_sync_end; /* Vertical sync end in lines */
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result-> Flags = (result->Flags)|VESA_CRTC_HSYNC_NEG; /* Flags (Interlaced, Double Scan etc) */
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if (want_interlace)
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{
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result->Flags = (result->Flags) | VESA_CRTC_INTERLACED;
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}
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result-> PixelClock = pixel_freq*1000000; /* Pixel clock in units of Hz */
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result-> RefreshRate = actual_V_frame_freq*100;/* Refresh rate in units of 0.01 Hz*/
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}
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