128 lines
3.9 KiB
JavaScript
128 lines
3.9 KiB
JavaScript
function Scanner(bookmarkBar, msec) {
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this.modes = ['lsb', 'usb', 'cw', 'am', 'sam', 'nfm'];
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this.bbar = bookmarkBar;
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this.bookmarks = null;
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this.msec = msec;
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this.current = -1;
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this.threshold = -80;
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}
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Scanner.prototype.tuneBookmark = function(b) {
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//console.log("TUNE: " + b.name + " at " + b.frequency + ": " + b.modulation);
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// Tune to the bookmark frequency
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var panel = $('#openwebrx-panel-receiver').demodulatorPanel();
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panel.getDemodulator().set_offset_frequency(b.frequency - center_freq);
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panel.setMode(b.modulation, b.underlying);
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// Done
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return true;
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}
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Scanner.prototype.update = function(data) {
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// Do not update if no timer or no bookmarks
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if (!this.timer || !this.bookmarks || !this.bookmarks.length) return;
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// Average level over time for each bookmark
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for(var j=0 ; j<this.bookmarks.length ; ++j) {
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var b = this.bookmarks[j];
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if (b.frequency > 0) {
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var l = data[Math.round(b.pos * data.length)];
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b.level += (l - b.level) / 3.0;
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}
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}
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}
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Scanner.prototype.scan = function() {
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// Do not scan if no timer or no bookmarks
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if (!this.timer || !this.bookmarks || !this.bookmarks.length) return;
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// Get current squelch threshold from the slider
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// (why do we need to subtract ~13dB here to make FFT match the S-meter?)
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var $slider = $('#openwebrx-panel-receiver .openwebrx-squelch-slider');
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this.threshold = $slider.val() - 13.0;
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// This is going to be our starting scan location
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var current = 0;
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// If there is currently selected bookmark...
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if (this.current>=0) {
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// Check if its current level still exceeds threshold
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var level = this.bookmarks[this.current].level;
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if (level>this.threshold) return;
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// If current bookmark no longer relevant, scan further
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current = this.current;
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this.current = -1;
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}
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// For every shown bookmark...
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for(var j=0 ; j<this.bookmarks.length ; ++j) {
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var b = this.bookmarks[current];
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//console.log("SCAN: " + b.name + " at " + b.frequency + ": " + b.level);
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// If level exceeds threshold, tune to the bookmark
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if (b.level>this.threshold && this.tuneBookmark(b)) {
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this.current = current;
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return;
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}
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// Go to the next bookmark
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current = (current + 1) % this.bookmarks.length;
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}
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};
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Scanner.prototype.stop = function() {
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// If timer running...
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if (this.timer) {
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// Stop redraw timer
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clearInterval(this.timer);
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this.timer = 0;
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// Remove current bookmarks
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this.bookmarks = null;
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}
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// Done
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return this.timer == null;
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}
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Scanner.prototype.start = function() {
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// If timer is not running...
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if (!this.timer) {
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// Nothing found yet
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this.current = -1;
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// Get all scannable bookmarks from the bookmark bar
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this.bookmarks = this.bbar.getAllBookmarks().filter(
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(b) => !!b.frequency && !!b.modulation && this.modes.indexOf(b.modulation)>=0
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);
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// If there are bookmarks to scan...
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if (this.bookmarks && this.bookmarks.length>0) {
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// Precompute FFT offsets, initialize levels
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for(var j=0 ; j<this.bookmarks.length ; ++j) {
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var f = this.bookmarks[j].frequency;
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this.bookmarks[j].level = -1000;
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this.bookmarks[j].pos = f>0? (f - center_freq) / bandwidth + 0.5 : 0;
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}
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// Start redraw timer
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var me = this;
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this.timer = setInterval(function() { me.scan(); }, this.msec);
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}
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}
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// Done
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return this.timer != null;
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}
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Scanner.prototype.toggle = function() {
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// Toggle based on the current timer state
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return this.timer? this.stop() : this.start();
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};
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Scanner.prototype.isRunning = function() {
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// Return current state
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return this.timer != null;
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};
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