123 lines
3.6 KiB
JavaScript
123 lines
3.6 KiB
JavaScript
function Scanner(bookmarkBar, msec) {
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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 = null;
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this.threshold = -80;
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this.data = [];
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}
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Scanner.prototype.tuneBookmark = function(b) {
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// Must have frequency, skip digital voice modes
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if (!b || !b.frequency || !b.modulation || b.modulation=='dmr') {
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return false;
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}
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//console.log("TUNE: " + b.name + " at " + b.frequency + ": " + b.modulation);
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// Make this bookmark current
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this.current = b;
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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.getLevel = function(b) {
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// Must have bookmark and frequency
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if(!b || !b.frequency || !this.data.length) return -1000;
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// Compute relevant FFT slot index
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var x = this.data.length * ((b.frequency - center_freq) / bandwidth + 0.5);
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return this.data[x | 0];
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}
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Scanner.prototype.update = function(data) {
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// Do not update if no timer
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if (!this.timer) return;
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var i = this.data.length < data.length? this.data.length : data.length;
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// Truncate stored data length, add and fill missing data
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if (this.data.length > i) {
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this.data.length = i;
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} else if(this.data.length < data.length) {
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this.data.length = data.length;
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for(var j=i; j<data.length; ++j) this.data[j] = data[j];
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}
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// Average level over time
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for(var j=0; j<i; ++j) this.data[j] += (data[j] - this.data[j]) / 10.0;
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}
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Scanner.prototype.scan = function() {
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// Do not scan if no timer or no data
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if (!this.bookmarks || !this.bookmarks.length) return;
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if (!this.timer || !this.data.length) return;
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// Get current squelch threshold from the slider
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var $slider = $('#openwebrx-panel-receiver .openwebrx-squelch-slider');
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this.threshold = $slider.val();
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// If there is currently selected bookmark...
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if (this.current) {
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var level = this.getLevel(this.current);
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if (level>this.threshold) return; else this.current = null;
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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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// Get bookmark's current level
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var b = this.bookmarks[j];
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var level = this.getLevel(b);
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//console.log("SCAN: " + b.name + " at " + b.frequency + ": " + level);
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// If level exceeds threshold, tune to the bookmark
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if (level>this.threshold && this.tuneBookmark(b)) return;
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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 and data
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this.bookmarks = null;
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this.current = null;
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this.data.length = 0;
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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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// Get all bookmarks from the bookmark bar
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this.bookmarks = this.bbar.getAllBookmarks();
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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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// 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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