Add implementation of analog TV signal generator (PAL so far)
Quick and dirty Howto: make && tv/osmotv --sdr-soapy --sdr-tx-gain 60 -r 15000000 -c 21 tx-fubk --sdr-tune-args "OFFSET=-3000000"
This commit is contained in:
Andreas Eversberg
492
src/tv/main.c
Normal file
492
src/tv/main.c
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@@ -0,0 +1,492 @@
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/* main function
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*
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* (C) 2017 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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*
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* This program 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 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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enum paging_signal;
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <signal.h>
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#include <math.h>
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#include "../common/sample.h"
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#include "../common/iir_filter.h"
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#include "../common/fm_modulation.h"
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#include "../common/wave.h"
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#include "../common/img.h"
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#include "../common/debug.h"
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#ifdef HAVE_SDR
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#include "../common/sdr_config.h"
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#include "../common/sdr.h"
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#endif
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#include "bas.h"
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#include "tv_modulate.h"
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#include "channels.h"
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int use_sdr = 0;
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int num_kanal = 1; /* only one channel used for debugging */
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void clear_console_text() {}
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void print_console_text() {}
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void display_status_limit_scroll() {}
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static double __attribute__((__unused__)) modulation = 0.7; /* level of modulation for I/Q amplitudes */
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static double frequency = 0.0;
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static int fbas = 1;
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static int tone = 1;
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static double circle_radius = 6.7;
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static int color_bar = 0;
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static int grid_only = 0;
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static const char *station_id = "Jolly Roger";
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static int __attribute__((__unused__)) latency = 30;
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static double samplerate = 10e6;
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static const char *wave_file = NULL;
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/* global variable to quit main loop */
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int quit = 0;
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void sighandler(int sigset)
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{
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if (sigset == SIGHUP)
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return;
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if (sigset == SIGPIPE)
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return;
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// clear_console_text();
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printf("Signal received: %d\n", sigset);
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quit = 1;
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}
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void print_help(const char *arg0)
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{
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printf("Usage: %s -f <frequency> | -c <channel> <command>\n", arg0);
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/* - - */
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printf("\ncommand:\n");
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printf(" tx-fubk Transmit FUBK test image (German PAL image)\n");
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printf(" tx-vcr Transmit VCR calibration pattern\n");
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printf(" tx-img <image> Transmit given image file\n");
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printf(" Use 4:3 image with 574 lines for best result.\n");
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printf("\ngeneral options:\n");
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printf(" -f --frequency <frequency>\n");
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printf(" Give frequency in Hertz.\n");
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printf(" -c --channel <channel>\n");
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printf(" Or give channel number.\n");
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printf(" Use 'list' to get a channel list.\n");
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printf(" -r --samplerate <frequency>\n");
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printf(" Give sample rate in Hertz.\n");
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printf(" -w --wave-file <filename>\n");
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printf(" Output to wave file instead of SDR\n");
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printf("\nsignal options:\n");
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printf(" -F --fbas 1 | 0\n");
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printf(" Turn color on or off. (default = %d)\n", fbas);
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printf(" -T --tone 1 | 0\n");
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printf(" Turn tone on or off. (default = %d)\n", tone);
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printf("\nFUBK options:\n");
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printf(" -R --circle-radius <radius> | 0\n");
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printf(" Use circle radius or 0 for off. (default = %.1f)\n", circle_radius);
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printf(" -C --color-bar 1 | 0\n");
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printf(" 1 == Color bar on, 0 = Show complete middle field. (default = %d)\n", color_bar);
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printf(" For clean scope signal, also turn off circle by setting radius to 0.\n");
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printf(" -G --grid-only 1 | 0\n");
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printf(" 1 == Show only the grid of the test image. (default = %d)\n", grid_only);
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printf(" -I --sation-id \"<text>\"\n");
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printf(" Give exactly 12 characters to display as Station ID.\n");
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printf(" (default = \"%s\")\n", station_id);
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#ifdef HAVE_SDR
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sdr_config_print_help();
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#endif
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}
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static struct option long_options_common[] = {
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{"help", 0, 0, 'h'},
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{"frequency", 1, 0, 'f'},
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{"channel", 1, 0, 'c'},
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{"samplerate", 1, 0, 'r'},
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{"wave-file", 1, 0, 'w'},
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{"fbas", 1, 0, 'F'},
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{"tone", 1, 0, 'T'},
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{"circle-radius", 1, 0, 'R'},
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{"color-bar", 1, 0, 'C'},
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{"grid-only", 1, 0, 'G'},
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{"station-id", 1, 0, 'I'},
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{0, 0, 0, 0}
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};
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static const char *optstring_common = "hf:c:r:w:F:T:R:C:G:I:";
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struct option *long_options;
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char *optstring;
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static void check_duplicate_option(int num, struct option *option)
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{
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int i;
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for (i = 0; i < num; i++) {
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if (long_options[i].val == option->val) {
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fprintf(stderr, "Duplicate option %d. Please fix!\n", option->val);
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abort();
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}
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}
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}
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void set_options_common(void)
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{
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int i = 0, j;
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long_options = calloc(sizeof(*long_options), 256);
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for (j = 0; long_options_common[i].name; i++, j++) {
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check_duplicate_option(i, &long_options_common[j]);
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memcpy(&long_options[i], &long_options_common[j], sizeof(*long_options));
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}
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#ifdef HAVE_SDR
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for (j = 0; sdr_config_long_options[j].name; i++, j++) {
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check_duplicate_option(i, &sdr_config_long_options[j]);
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memcpy(&long_options[i], &sdr_config_long_options[j], sizeof(*long_options));
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}
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#endif
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optstring = calloc(256, 2);
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strcpy(optstring, optstring_common);
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#ifdef HAVE_SDR
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strcat(optstring, sdr_config_optstring);
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#endif
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}
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static int handle_options(int argc, char **argv)
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{
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int skip_args = 0;
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#ifdef HAVE_SDR
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int rc;
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#endif
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set_options_common();
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while (1) {
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int option_index = 0, c;
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c = getopt_long(argc, argv, optstring, long_options, &option_index);
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if (c == -1)
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break;
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switch (c) {
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case 'h':
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print_help(argv[0]);
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exit(0);
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case 'f':
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frequency = atof(optarg);
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skip_args += 2;
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break;
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case 'c':
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if (!strcmp(optarg, "list")) {
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list_tv_channels();
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exit(0);
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}
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frequency = get_tv_video_frequency(atoi(optarg));
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if (frequency == 0.0) {
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fprintf(stderr, "Given channel number unknown, use \"-c list\" to get a list.\n");
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exit(0);
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}
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skip_args += 2;
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break;
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case 'r':
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samplerate = atof(optarg);
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skip_args += 2;
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break;
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case 'w':
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wave_file = strdup(optarg);
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skip_args += 2;
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break;
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case 'F':
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fbas = atoi(optarg);
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skip_args += 2;
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break;
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case 'T':
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tone = atoi(optarg);
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skip_args += 2;
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break;
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case 'R':
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circle_radius = atof(optarg);
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skip_args += 2;
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break;
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case 'C':
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color_bar = atoi(optarg);
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skip_args += 2;
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break;
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case 'G':
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grid_only = atoi(optarg);
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skip_args += 2;
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break;
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case 'I':
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station_id = strdup(optarg);
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if (strlen(station_id) != 12) {
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fprintf(stderr, "Given station ID must be exactly 12 charaters long. (Use spaces to fill it.)\n");
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exit(0);
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}
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skip_args += 2;
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break;
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default:
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#ifdef HAVE_SDR
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rc = sdr_config_opt_switch(c, &skip_args);
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if (rc < 0)
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exit(0);
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#endif
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break;
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}
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}
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return skip_args;
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}
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static void tx_bas(sample_t *sample_bas, __attribute__((__unused__)) sample_t *sample_tone, uint8_t *power_tone, int samples)
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{
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/* catch signals */
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signal(SIGINT, sighandler);
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signal(SIGHUP, sighandler);
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signal(SIGTERM, sighandler);
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signal(SIGPIPE, sighandler);
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if (wave_file) {
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wave_rec_t rec;
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int rc;
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sample_t *buffers[1];
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rc = wave_create_record(&rec, wave_file, samplerate, 1, 1.0);
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if (rc < 0) {
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// FIXME cleanup
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exit(0);
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}
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buffers[0] = sample_bas;
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wave_write(&rec, buffers, samples);
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wave_destroy_record(&rec);
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} else {
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#ifdef HAVE_SDR
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float *buff = NULL;
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void *sdr = NULL;
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int latspl = samplerate * latency / 1000;
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float *sendbuff;
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sendbuff = calloc(latspl * 2, sizeof(*sendbuff));
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if (!sendbuff) {
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fprintf(stderr, "No mem!\n");
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goto error;
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}
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/* modulate */
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buff = calloc(samples + 10.0, sizeof(sample_t) * 2);
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if (!buff) {
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fprintf(stderr, "No mem!\n");
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goto error;
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}
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tv_modulate(buff, samples, sample_bas, modulation);
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if (sample_tone) {
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/* bandwidth is 2*(deviation + 2*f(sig)) = 2 * (50 + 2*15) = 160khz */
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fm_mod_t mod;
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fm_mod_init(&mod, samplerate, 5500000.0, modulation * 0.1);
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mod.state = MOD_STATE_ON; /* do not ramp up */
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fm_modulate_complex(&mod, sample_tone, power_tone, samples, buff);
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}
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double tx_frequencies[1], rx_frequencies[1];
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tx_frequencies[0] = frequency;
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rx_frequencies[0] = frequency;
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sdr = sdr_open(NULL, tx_frequencies, rx_frequencies, 1, 0.0, samplerate, latspl, 0.0, 0.0);
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if (!sdr)
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goto error;
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sdr_start(sdr);
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int pos = 0, max = samples * 2;
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int s, ss, tosend;
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while (!quit) {
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usleep(1000);
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sdr_read(sdr, (void *)sendbuff, latspl, 0);
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tosend = sdr_get_tosend(sdr, latspl);
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if (tosend > latspl / 10)
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tosend = latspl / 10;
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if (tosend == 0) {
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continue;
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}
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for (s = 0, ss = 0; s < tosend; s++) {
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sendbuff[ss++] = buff[pos++];
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sendbuff[ss++] = buff[pos++];
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if (pos == max) {
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pos = 0;
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}
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}
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sdr_write(sdr, (void *)sendbuff, NULL, tosend, NULL, NULL, 0);
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}
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error:
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free(sendbuff);
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free(buff);
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if (sdr)
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sdr_close(sdr);
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#endif
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}
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/* reset signals */
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signal(SIGINT, SIG_DFL);
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signal(SIGHUP, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGPIPE, SIG_DFL);
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}
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static int tx_test_picture(enum bas_type type)
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{
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bas_t bas;
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sample_t *test_bas = NULL;
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sample_t *test_tone = NULL;
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uint8_t *test_power = NULL;
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int i;
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int ret = -1;
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int count;
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/* test image, add some samples in case of overflow due to rounding errors */
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test_bas = calloc(samplerate / 25.0 * 4.0 + 10.0, sizeof(sample_t));
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if (!test_bas) {
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fprintf(stderr, "No mem!\n");
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goto error;
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}
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bas_init(&bas, samplerate, type, fbas, circle_radius, color_bar, grid_only, station_id, NULL, 0, 0);
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count = bas_generate(&bas, test_bas);
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count += bas_generate(&bas, test_bas + count);
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count += bas_generate(&bas, test_bas + count);
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count += bas_generate(&bas, test_bas + count);
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if (tone) {
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/* for more about audio modulation on tv, see: http://elektroniktutor.de/geraetetechnik/fston.html */
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test_tone = calloc(count, sizeof(sample_t));
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if (!test_tone) {
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fprintf(stderr, "No mem!\n");
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goto error;
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}
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test_power = calloc(count, sizeof(uint8_t));
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if (!test_power) {
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fprintf(stderr, "No mem!\n");
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goto error;
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}
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/* emphasis 50us, but 1000Hz does not change level */
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for (i = 0; i < count; i++)
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test_tone[i] = sin((double)i * 2.0 * M_PI * 1000.0 / samplerate) * 50000;
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memset(test_power, 1, count);
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}
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tx_bas(test_bas, test_tone, test_power, count);
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ret = 0;
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error:
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free(test_bas);
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free(test_tone);
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free(test_power);
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return ret;
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}
|
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|
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static int tx_img(const char *filename)
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{
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unsigned short *img = NULL;
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int width, height;
|
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bas_t bas;
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sample_t *img_bas = NULL;
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int ret = -1;
|
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int count;
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|
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img = load_img(&width, &height, filename, 0);
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if (!img) {
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fprintf(stderr, "Failed to load grey image '%s'\n", filename);
|
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return -1;
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}
|
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|
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/* test image, add some samples in case of overflow due to rounding errors */
|
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img_bas = calloc(samplerate / 25.0 * 4.0 + 10.0, sizeof(sample_t));
|
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if (!img_bas) {
|
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fprintf(stderr, "No mem!\n");
|
||||
goto error;
|
||||
}
|
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bas_init(&bas, samplerate, BAS_IMAGE, fbas, circle_radius, color_bar, grid_only, NULL, img, width, height);
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count = bas_generate(&bas, img_bas);
|
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count += bas_generate(&bas, img_bas + count);
|
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count += bas_generate(&bas, img_bas + count);
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count += bas_generate(&bas, img_bas + count);
|
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|
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tx_bas(img_bas, NULL, NULL, count);
|
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|
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ret = 0;
|
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error:
|
||||
free(img_bas);
|
||||
free(img);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
int skip_args;
|
||||
int __attribute__((__unused__)) rc;
|
||||
const char *arg0 = argv[0];
|
||||
|
||||
debuglevel = 0;
|
||||
|
||||
#ifdef HAVE_SDR
|
||||
sdr_config_init();
|
||||
#endif
|
||||
|
||||
skip_args = handle_options(argc, argv);
|
||||
argc -= skip_args + 1;
|
||||
argv += skip_args + 1;
|
||||
|
||||
if (frequency == 0.0 && !wave_file) {
|
||||
print_help(arg0);
|
||||
exit(0);
|
||||
}
|
||||
|
||||
if (!wave_file) {
|
||||
#ifdef HAVE_SDR
|
||||
rc = sdr_configure(samplerate);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
#endif
|
||||
}
|
||||
|
||||
if (argc < 1) {
|
||||
fprintf(stderr, "Expecting command, see help!\n");
|
||||
exit(0);
|
||||
} else if (!strcmp(argv[0], "tx-fubk")) {
|
||||
tx_test_picture(BAS_FUBK);
|
||||
} else if (!strcmp(argv[0], "tx-vcr")) {
|
||||
tx_test_picture(BAS_VCR);
|
||||
} else if (!strcmp(argv[0], "tx-img")) {
|
||||
if (argc < 2) {
|
||||
fprintf(stderr, "Expecting image file, see help!\n");
|
||||
exit(0);
|
||||
}
|
||||
tx_img(argv[1]);
|
||||
} else {
|
||||
fprintf(stderr, "Unknown command '%s', see help!\n", argv[0]);
|
||||
exit(0);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user