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/* hacktv - Analogue video transmitter for the HackRF */
/*=======================================================================*/
/* Copyright 2017 Philip Heron <phil@sanslogic.co.uk> */
/* */
/* This program is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation, either version 3 of the License, or */
/* (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <math.h>
#include <stdlib.h>
#include "hacktv.h"
/* A small 2-bit hacktv logo */
#define LOGO_WIDTH 48
#define LOGO_HEIGHT 9
#define LOGO_SCALE 4
static const char *_logo =
" "
" ## ## ## #### ## ## ###### ## ## "
" ## ## #### ## ## ## ## ## ## ## "
" ## ## ## ## ## #### ## ## ## "
" ###### ###### ## ### ## ## ## "
" ## ## ## ## ## #### ## ## ## "
" ## ## ## ## ## ## ## ## ## #### "
" ## ## ## ## #### ## ## ## ## "
" ";
/* AV test pattern source */
typedef struct {
int width;
int height;
uint32_t *video;
int16_t *audio;
size_t audio_samples;
} av_test_t;
static uint32_t *_av_test_read_video(void *private, float *ratio)
{
av_test_t *av = private;
if(ratio) *ratio = 4.0 / 3.0;
return(av->video);
}
static int16_t *_av_test_read_audio(void *private, size_t *samples)
{
av_test_t *av = private;
*samples = av->audio_samples;
return(av->audio);
}
static int _av_test_close(void *private)
{
av_test_t *av = private;
if(av->video) free(av->video);
if(av->audio) free(av->audio);
free(av);
return(HACKTV_OK);
}
int av_test_open(vid_t *s)
{
uint32_t const bars[8] = {
0x000000,
0x0000BF,
0xBF0000,
0xBF00BF,
0x00BF00,
0x00BFBF,
0xBFBF00,
0xFFFFFF,
};
av_test_t *av;
int c, x, y;
double d;
int16_t l;
av = calloc(1, sizeof(av_test_t));
if(!av)
{
return(HACKTV_OUT_OF_MEMORY);
}
/* Generate a basic test pattern */
av->width = s->active_width;
av->height = s->conf.active_lines;
av->video = malloc(vid_get_framebuffer_length(s));
if(!av->video)
{
free(av);
return(HACKTV_OUT_OF_MEMORY);
}
for(y = 0; y < s->conf.active_lines; y++)
{
for(x = 0; x < s->active_width; x++)
{
if(y < s->conf.active_lines - 140)
{
/* 75% colour bars */
c = 7 - x * 8 / s->active_width;
c = bars[c];
}
else if(y < s->conf.active_lines - 120)
{
/* 75% red */
c = 0xBF0000;
}
else if(y < s->conf.active_lines - 100)
{
/* Gradient black to white */
c = x * 0xFF / (s->active_width - 1);
c = c << 16 | c << 8 | c;
}
else
{
/* 8 level grey bars */
c = x * 0xFF / (s->active_width - 1);
c &= 0xE0;
c = c | (c >> 3) | (c >> 6);
c = c << 16 | c << 8 | c;
}
av->video[y * s->active_width + x] = c;
}
}
/* Overlay the logo */
if(s->active_width >= LOGO_WIDTH * LOGO_SCALE &&
s->conf.active_lines >= LOGO_HEIGHT * LOGO_SCALE)
{
x = s->active_width / 2;
y = s->conf.active_lines / 10;
for(x = 0; x < LOGO_WIDTH * LOGO_SCALE; x++)
{
for(y = 0; y < LOGO_HEIGHT * LOGO_SCALE; y++)
{
c = _logo[y / LOGO_SCALE * LOGO_WIDTH + x / LOGO_SCALE] == ' ' ? 0x000000 : 0xFFFFFF;
av->video[(s->conf.active_lines / 10 + y) * s->active_width + ((s->active_width - LOGO_WIDTH * LOGO_SCALE) / 2) + x] = c;
}
}
}
/* Generate the 1khz test tones (BBC 1 style) */
d = 1000.0 * 2 * M_PI / HACKTV_AUDIO_SAMPLE_RATE;
y = HACKTV_AUDIO_SAMPLE_RATE * 64 / 100; /* 640ms */
av->audio_samples = y * 10; /* 6.4 seconds */
av->audio = malloc(av->audio_samples * 2 * sizeof(int16_t));
if(!av->audio)
{
free(av);
return(HACKTV_OUT_OF_MEMORY);
}
for(x = 0; x < av->audio_samples; x++)
{
l = sin(x * d) * INT16_MAX * 0.1;
if(x < y)
{
/* 0 - 640ms, interrupt left channel */
av->audio[x * 2 + 0] = 0;
av->audio[x * 2 + 1] = l;
}
else if(x >= y * 2 && x < y * 3)
{
/* 1280ms - 1920ms, interrupt right channel */
av->audio[x * 2 + 0] = l;
av->audio[x * 2 + 1] = 0;
}
else if(x >= y * 4 && x < y * 5)
{
/* 2560ms - 3200ms, interrupt right channel again */
av->audio[x * 2 + 0] = l;
av->audio[x * 2 + 1] = 0;
}
else
{
/* Use both channels for all other times */
av->audio[x * 2 + 0] = l; /* Left */
av->audio[x * 2 + 1] = l; /* Right */
}
}
/* Register the callback functions */
s->av_private = av;
s->av_read_video = _av_test_read_video;
s->av_read_audio = _av_test_read_audio;
s->av_close = _av_test_close;
return(HACKTV_OK);
}
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