aboutsummaryrefslogtreecommitdiffstats
path: root/dvb-c/de-Muenchen
diff options
context:
space:
mode:
Diffstat (limited to 'dvb-c/de-Muenchen')
0 files changed, 0 insertions, 0 deletions
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220
a>
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
/*
 * wavemon - a wireless network monitoring aplication
 *
 * Copyright (c) 2001-2002 Jan Morgenstern <jan@jm-music.de>
 *
 * wavemon 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 2, or (at your option) any later
 * version.
 *
 * wavemon 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 wavemon; see the file COPYING.  If not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#include "iw_if.h"

/* Number of lines in the key window at the bottom */
#define KEY_WIN_HEIGHT	3

/* Total number of lines in the histogram window */
#define HIST_WIN_HEIGHT	(WAV_HEIGHT - KEY_WIN_HEIGHT)

/*
 * Analogous to MAXYLEN, the following sets both the
 * - highest y/line index and the
 * - total count of lines inside the histogram window.
 */
#define HIST_MAXYLEN	(HIST_WIN_HEIGHT - 1)

/* Position (relative to right border) and maximum length of dBm level tags. */
#define LEVEL_TAG_POS	5

/* GLOBALS */
static WINDOW *w_lhist, *w_key;

/*
 *	Keeping track of global minima/maxima
 */
static struct iw_extrema {
	bool	initialised;
	float	min;
	float	max;
} e_signal, e_noise, e_snr;

static void init_extrema(struct iw_extrema *ie)
{
	memset(ie, 0, sizeof(*ie));
}

static void track_extrema(const float new_sample, struct iw_extrema *ie)
{
	if (! ie->initialised) {
		ie->initialised = true;
		ie->min = ie->max = new_sample;
	} else if (new_sample < ie->min) {
		ie->min = new_sample;
	} else if (new_sample > ie->max) {
		ie->max = new_sample;
	}
}

static char *fmt_extrema(const struct iw_extrema *ie, const char *unit)
{
	static char range[256];

	if (! ie->initialised)
		snprintf(range, sizeof(range), "unknown");
	else if (ie->min == ie->max)
		snprintf(range, sizeof(range), "%+.0f %s", ie->min, unit);
	else
		snprintf(range, sizeof(range), "%+.0f..%+.0f %s", ie->min,
								ie->max, unit);
	return range;
}

/*
 * Simple array-based circular FIFO buffer
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * Insertion works from lower to higher indices.
 * Access works from higher down to lower indices.
 *
 * Cases & assumptions:
 * ~~~~~~~~~~~~~~~~~~~~
 * - principle: unsigned counter + hash function to handle array wrap-around;
 * - buffer is empty if count == 0;
 * - else count indicates the next place to insert(modulo %IW_STACKSIZE).
 */
#define IW_STACKSIZE		1024
static struct iw_levelstat	iw_stats_cache[IW_STACKSIZE];
static uint32_t			count;
#define COUNTMAX		(typeof(count))-1

static void iw_cache_insert(const struct iw_levelstat new)
{
	iw_stats_cache[count % IW_STACKSIZE] = new;
	/*
	 * Handle counter overflow by mapping into a smaller index which is
	 * identical (modulo %IW_STACKSIZE) to the old value. (The datatype
	 * of 'count' must be able to express at least 2 * IW_STACKSIZE.)
	 */
	if (++count == COUNTMAX)
		count = IW_STACKSIZE + (COUNTMAX % IW_STACKSIZE);
}

static struct iw_levelstat iw_cache_get(const uint32_t index)
{
	struct iw_levelstat zero = IW_LSTAT_INIT;

	if (index > IW_STACKSIZE || index > count)
		return zero;
	return iw_stats_cache[(count - index) % IW_STACKSIZE];
}

void iw_cache_update(struct iw_stat *iw)
{
	static struct iw_levelstat prev, avg = IW_LSTAT_INIT;
	static int slot;

	if (! (iw->stat.qual.updated & IW_QUAL_LEVEL_INVALID)) {
		avg.flags  &= ~IW_QUAL_LEVEL_INVALID;
		avg.signal += iw->dbm.signal / conf.slotsize;
		track_extrema(iw->dbm.signal, &e_signal);
	}

	if (! (iw->stat.qual.updated & IW_QUAL_NOISE_INVALID)) {
		avg.flags &= ~IW_QUAL_NOISE_INVALID;
		avg.noise += iw->dbm.noise / conf.slotsize;
		track_extrema(iw->dbm.noise, &e_noise);
		track_extrema(iw->dbm.signal - iw->dbm.noise, &e_snr);
	}

	if (++slot >= conf.slotsize) {
		iw_cache_insert(avg);

		if (conf.lthreshold_action &&
		    prev.signal < conf.lthreshold &&
		    avg.signal >= conf.lthreshold)
			threshold_action(conf.lthreshold);
		else if (conf.hthreshold_action &&
			 prev.signal > conf.hthreshold &&
			 avg.signal <= conf.hthreshold)
			threshold_action(conf.hthreshold);

		prev = avg;
		avg.signal = avg.noise = slot = 0;
		avg.flags  = IW_QUAL_LEVEL_INVALID | IW_QUAL_NOISE_INVALID;
	}
}

/*
 * Histogram-specific display functions
 */
static double hist_level(double val, int min, int max)
{
	return map_range(val, min, max, 1, HIST_MAXYLEN);
}

static double hist_level_inverse(int y_level, int min, int max)
{
	return map_range(y_level, 1, HIST_MAXYLEN, min, max);
}

/* Order needs to be reversed as y-coordinates grow downwards */
static int hist_y(int yval)
{
	return reverse_range(yval, 1, HIST_MAXYLEN);
}

/* Values come in from the right, so 'x' also needs to be reversed */
static int hist_x(int xval)
{
	return reverse_range(xval, 1, MAXXLEN);
}

/* plot single values, without clamping to min/max */
static void hist_plot(double yval, int xval, enum colour_pair plot_colour)
{
	double level, fraction;
	chtype ch;

	fraction = modf(yval, &level);

	if (in_range(level, 1, HIST_MAXYLEN)) {
		/*
		 * The 5 different scanline chars provide a pretty good accuracy.
		 * ncurses will fall back to standard ASCII chars anyway if they
		 * are not available.
		 */
		if (fraction < 0.2)
			ch = ACS_S9;
		else if (fraction < 0.4)
			ch = ACS_S7;
		else if (fraction < 0.6)
			ch = ACS_HLINE;
		else if (fraction < 0.8)
			ch = ACS_S3;
		else
			ch = ACS_S1;

		wattrset(w_lhist, COLOR_PAIR(plot_colour) | A_BOLD);
		mvwaddch(w_lhist, hist_y(level), hist_x(xval), ch);
	}
}

static void display_lhist(void)
{
	struct iw_levelstat iwl;
	double snr_level, noise_level, sig_level;
	enum colour_pair plot_colour;
	int x, y;

	for (x = 1; x <= MAXXLEN; x++) {

		iwl = iw_cache_get(x);

		/* Clear screen and set up horizontal grid lines */
		wattrset(w_lhist, COLOR_PAIR(CP_STATBKG));
		for (y = 1; y <= HIST_MAXYLEN; y++)
			mvwaddch(w_lhist, hist_y(y), hist_x(x), y % 5 ? ' ' : '-');

		/*
		 * SNR comes first, as it determines the background. If either
		 * noise or signal is invalid, set level below minimum value to
		 * indicate that no background is present.
		 */
		if (iwl.flags & (IW_QUAL_NOISE_INVALID | IW_QUAL_LEVEL_INVALID)) {
			snr_level = 0;
		} else {
			snr_level = hist_level(iwl.signal - iwl.noise,
					       conf.sig_min - conf.noise_max,
					       conf.sig_max - conf.noise_min);

			wattrset(w_lhist, COLOR_PAIR(CP_STATSNR));
			for (y = 1; y <= clamp(snr_level, 1, HIST_MAXYLEN); y++)
				mvwaddch(w_lhist, hist_y(y), hist_x(x), ' ');
		}

		if (! (iwl.flags & IW_QUAL_NOISE_INVALID)) {
			noise_level = hist_level(iwl.noise, conf.noise_min, conf.noise_max);
			plot_colour = noise_level > snr_level ? CP_STATNOISE : CP_STATNOISE_S;
			hist_plot(noise_level, x, plot_colour);

		} else if (x == LEVEL_TAG_POS && ! (iwl.flags & IW_QUAL_LEVEL_INVALID)) {
			char	tmp[LEVEL_TAG_POS + 1];
			int	len;
			/*
			 * Tag the horizontal grid lines with dBm levels.
			 * This is only supported for signal levels, when the screen is not
			 * shared by several graphs (each having a different scale).
			 */
			wattrset(w_lhist, COLOR_PAIR(CP_STATSIG));
			for (y = 1; y <= HIST_MAXYLEN; y++) {
				if (y != 1 && (y % 5) && y != HIST_MAXYLEN)
					continue;
				len = snprintf(tmp, sizeof(tmp), "%.0f",
					       hist_level_inverse(y, conf.sig_min,
								     conf.sig_max));
				mvwaddstr(w_lhist, hist_y(y), hist_x(len), tmp);
			}
		}

		if (! (iwl.flags & IW_QUAL_LEVEL_INVALID)) {
			sig_level   = hist_level(iwl.signal, conf.sig_min, conf.sig_max);
			plot_colour = sig_level > snr_level ? CP_STATSIG : CP_STATSIG_S;
			hist_plot(sig_level, x, plot_colour);
		}
	}

	wrefresh(w_lhist);
}

static void display_key(WINDOW *w_key)
{
	/* Clear the (one-line) screen) */
	wmove(w_key, 1, 1);
	wclrtoborder(w_key);

	wattrset(w_key, COLOR_PAIR(CP_STANDARD));
	waddch(w_key, '[');
	wattrset(w_key, COLOR_PAIR(CP_STATSIG));
	waddch(w_key, ACS_HLINE);
	wattrset(w_key, COLOR_PAIR(CP_STANDARD));

	wprintw(w_key, "] sig lvl (%s)  [", fmt_extrema(&e_signal, "dBm"));

	wattrset(w_key, COLOR_PAIR(CP_STATNOISE));
	waddch(w_key, ACS_HLINE);
	wattrset(w_key, COLOR_PAIR(CP_STANDARD));

	wprintw(w_key, "] ns lvl (%s)  [", fmt_extrema(&e_noise, "dBm"));

	wattrset(w_key, COLOR_PAIR(CP_STATSNR));
	waddch(w_key, ' ');

	wattrset(w_key, COLOR_PAIR(CP_STANDARD));
	wprintw(w_key, "] S-N ratio (%s)", fmt_extrema(&e_snr, "dB"));

	wrefresh(w_key);
}

static void redraw_lhist(int signum)
{
	static int vcount = 1;

	sampling_do_poll();
	if (!--vcount) {
		vcount = conf.slotsize;
		display_lhist();
		display_key(w_key);
	}
}

void scr_lhist_init(void)
{
	w_lhist = newwin_title(0, HIST_WIN_HEIGHT, "Level histogram", true);
	w_key   = newwin_title(HIST_MAXYLEN + 1, KEY_WIN_HEIGHT, "Key", false);

	init_extrema(&e_signal);
	init_extrema(&e_noise);
	init_extrema(&e_snr);
	sampling_init(redraw_lhist);

	display_key(w_key);
}

int scr_lhist_loop(WINDOW *w_menu)
{
	return wgetch(w_menu);
}

void scr_lhist_fini(void)
{
	sampling_stop();
	delwin(w_lhist);
	delwin(w_key);
}