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rf-tools/src/broadcast_tv/composite.c

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///////////////////////////////////////////////////////////////////////////////////
//-------------------------------------------------------------------------------//
//-------------------------------------------------------------------------------//
//-----------H----H--X----X-----CCCCC----22222----0000-----0000------11----------//
//----------H----H----X-X-----C--------------2---0----0---0----0--1--1-----------//
//---------HHHHHH-----X------C----------22222---0----0---0----0-----1------------//
//--------H----H----X--X----C----------2-------0----0---0----0-----1-------------//
//-------H----H---X-----X---CCCCC-----222222----0000-----0000----1111------------//
//-------------------------------------------------------------------------------//
//----------------------------------------------------- http://hxc2001.free.fr --//
///////////////////////////////////////////////////////////////////////////////////
// File : composite.c
// Contains: Composite video signal generator
//
// This file is part of rf-tools.
//
// Written by: Jean-François DEL NERO
//
// Copyright (C) 2023 Jean-François DEL NERO
//
// You are free to do what you want with this code.
// A credit is always appreciated if you use it into your product :)
//
// Change History (most recent first):
///////////////////////////////////////////////////////////////////////////////////
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "composite.h"
#define EQUALIZING_PULSE_LEN 2.35
#define LINE_PULSE_LEN 4.7
#define ASSERTED_LEVEL 0
#define DEASSERTED_LEVEL 40
#define COMPOSITE_LINE_PERIOD_US 64
// PAL / Secam : 768 x 576
// NTSC : 720 x 480 (Old : 640 x 480)
// PAL-L timings
pulses_state vertical_blanking[]=
{
// First sequence of equalizing pulses
{ 5, ASSERTED_LEVEL, DEASSERTED_LEVEL, EQUALIZING_PULSE_LEN/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US/2)/(double)1E6),0},
// Sequence of synchronizing pulses (Line 1 count)
{ 5, ASSERTED_LEVEL, DEASSERTED_LEVEL, 27.3/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US/2)/(double)1E6),0},
// Duration of second sequence of equalizing pulses
{ 5, ASSERTED_LEVEL, DEASSERTED_LEVEL, EQUALIZING_PULSE_LEN/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US/2)/(double)1E6),0},
// Blank Lines (6 > 23)
{18, ASSERTED_LEVEL, DEASSERTED_LEVEL, LINE_PULSE_LEN/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US)/(double)1E6),0},
// Lines (24 > 310)
{287, ASSERTED_LEVEL, DEASSERTED_LEVEL, LINE_PULSE_LEN/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US)/(double)1E6),1},
// First sequence of equalizing pulses
{ 5, ASSERTED_LEVEL, DEASSERTED_LEVEL, EQUALIZING_PULSE_LEN/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US/2)/(double)1E6),0},
// Sequence of synchronizing pulses (Line 1 count)
{ 5, ASSERTED_LEVEL, DEASSERTED_LEVEL, 27.3/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US/2)/(double)1E6),0},
// Duration of second sequence of equalizing pulses
{ 5, ASSERTED_LEVEL, DEASSERTED_LEVEL, EQUALIZING_PULSE_LEN/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US/2)/(double)1E6),0},
// -- end of line 318
{ 1, DEASSERTED_LEVEL, DEASSERTED_LEVEL, 0 ,(COMPOSITE_LINE_PERIOD_US/2)/(double)1E6,0},
// Blank Lines (319 > 335)
{17, ASSERTED_LEVEL, DEASSERTED_LEVEL, LINE_PULSE_LEN/(double)1E6 ,(COMPOSITE_LINE_PERIOD_US)/(double)1E6,0},
// Lines (336 > 622)
{287, ASSERTED_LEVEL, DEASSERTED_LEVEL, LINE_PULSE_LEN/(double)1E6 ,(COMPOSITE_LINE_PERIOD_US)/(double)1E6,3},
// Line 623 - (half)
{ 1, ASSERTED_LEVEL, DEASSERTED_LEVEL, LINE_PULSE_LEN/(double)1E6 ,((COMPOSITE_LINE_PERIOD_US)/2)/(double)1E6,0},
// End
{ 0, 0, 0, 0 ,0,0}
};
void init_composite(composite_state * state, int sample_rate, int x_res, int y_res, uint32_t * bmp)
{
int i;
state->sample_period = (double)1 / (double)sample_rate;
state->buf_x_res = x_res;
state->buf_y_res = y_res;
state->video_buffer = bmp;
if(!state->video_buffer)
{
state->video_buffer = malloc( x_res * y_res * sizeof(uint32_t) );
if(state->video_buffer)
{
memset(state->video_buffer,0,x_res * y_res * sizeof(uint32_t) );
// Basic Mire test init
for(i=0;i<x_res;i++)
state->video_buffer[i] = 0xFFFFFF;
for(i=0;i<x_res;i++)
state->video_buffer[((y_res-1)*x_res) + i] = 0xFFFFFF;
for(i=0;i<y_res;i++)
state->video_buffer[((i)*x_res)] = 0xFFFFFF;
for(i=0;i<y_res;i++)
state->video_buffer[((i)*x_res) + (x_res - 1)] = 0xFFFFFF;
for(i=0;i<x_res/2;i++)
{
state->video_buffer[(x_res/4) + (((y_res/4)-1)*x_res) + i] = 0xFFFFFF;
state->video_buffer[(x_res/4) + (((y_res/4)-1)*x_res) + i + x_res] = 0xFFFFFF;
state->video_buffer[(x_res/4) + (((y_res - (y_res/4))-1)*x_res) + i] = 0xFFFFFF;
state->video_buffer[(x_res/4) + (((y_res - (y_res/4))-1)*x_res) + i + x_res] = 0xFFFFFF;
state->video_buffer[(x_res/4) + (((y_res - (y_res/2))-1)*x_res) + i] = 0x6F6F6F;
state->video_buffer[(x_res/4) + (((y_res - (y_res/2))-1)*x_res) + i + x_res] = 0x6F6F6F;
}
for(i=y_res/4;i<(y_res - (y_res/4));i++)
{
state->video_buffer[(x_res/4) + ((i)*x_res)] = 0xFFFFFF;
state->video_buffer[(x_res/4) + ((i)*x_res) + (x_res/4)] = 0x6F6F6F;
state->video_buffer[(x_res/2) + ((i)*x_res) + (x_res/4)] = 0xFFFFFF;
}
}
}
// RGB to Y table.
for(i=0;i<256;i++)
{
state->r_yconv[i] = (double)i * 0.299;
state->g_yconv[i] = (double)i * 0.587;
state->b_yconv[i] = (double)i * 0.114;
state->uconv[i] = (double)i * 0.492;
state->vconv[i] = (double)i * 0.877;
}
state->step_index = 0;
state->cur_state_time = 0;
}
void gen_video_signal(composite_state * state, double * vid_signal, int buf_size)
{
int i,xpos;
double value,yvalue,uvalue,vvalue;
uint32_t rgb_word;
value = 0;
i = 0;
while(i < buf_size)
{
if( state->cur_state_time >= vertical_blanking[state->step_index].total_duration)
{
state->cur_state_time = 0;
state->repeat_cnt++;
if(vertical_blanking[state->step_index].type & 1)
state->cur_line_index++;
else
state->cur_line_index = 0;
if( state->repeat_cnt >= vertical_blanking[state->step_index].repeat )
{
state->repeat_cnt = 0;
state->step_index++;
}
if(!vertical_blanking[state->step_index].repeat)
{
state->step_index = 0;
}
}
if( state->cur_state_time >= vertical_blanking[state->step_index].first_duration )
{
value = vertical_blanking[state->step_index].end_val;
}
else
{
value = vertical_blanking[state->step_index].start_val;
}
if(vertical_blanking[state->step_index].type & 1)
{
if(state->cur_state_time >= vertical_blanking[state->step_index].first_duration)
{
if(state->cur_state_time >= vertical_blanking[state->step_index].first_duration + ((3.5+4.7)/(double)1E6))
{
// Stream pixels line
if(state->cur_state_time <= vertical_blanking[state->step_index].first_duration + ((3.5+4.7)/(double)1E6) + (45.6/(double)1E6) )
{
xpos = ((state->cur_state_time - ( vertical_blanking[state->step_index].first_duration + ((3.5+4.7)/(double)1E6) )) / (45.6/(double)1E6)) * state->buf_x_res;
value = vertical_blanking[state->step_index].end_val;
rgb_word = state->video_buffer[(state->cur_line_index * state->buf_x_res * 2) + ( state->buf_x_res * (((vertical_blanking[state->step_index].type>>1)^1)&1)) + xpos];
// Y / Luminance
yvalue = state->r_yconv[rgb_word & 0xFF] + state->g_yconv[( rgb_word >> 8 )& 0xFF] + state->b_yconv[( rgb_word >> 16 )& 0xFF];
// UV
uvalue = (double)((( rgb_word >> 16 )& 0xFF) - yvalue)*0.492;
vvalue = (double)(( rgb_word & 0xFF) - yvalue)*0.877;
value += (double)( yvalue * ((double)((double)100.0 - vertical_blanking[state->step_index].end_val)/(double)256));
}
else
{
value = vertical_blanking[state->step_index].end_val;
}
}
else
{
// TODO : Color Burst
value = vertical_blanking[state->step_index].end_val;
}
}
}
else
state->cur_line_index = 0;
vid_signal[i] = value;
state->cur_state_time += state->sample_period;
i++;
}
}
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