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| Original file line number | Diff line number | Diff line change |
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| /*! wavesurfer.js 1.1.1 (Mon, 04 Apr 2016 09:49:47 GMT) | ||
| * https://github.com/katspaugh/wavesurfer.js | ||
| * @license CC-BY-3.0 */ | ||
|
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||
| 'use strict'; | ||
|
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||
| /** | ||
| * Purpose: | ||
| * Add methods getFrequencyRGB, getFrequencies, resample, drawSpectrogram | ||
| * to WaveSurfer.Drawer.Canvas. These methods are modified versions from the the | ||
| * spectrogram plugin (https://github.com/katspaugh/wavesurfer.js/blob/master/plugin/wavesurfer.spectrogram.js) | ||
| * to allow the wavesurfer drawer to draw a spectrogram representation when this.params.visualization is | ||
| * set to "spectrogram" | ||
| * Dependencies: | ||
| * WaveSurfer (lib/wavesurfer.min.js & lib/wavesurfer.spectrogram.min.js) | ||
| */ | ||
| WaveSurfer.util.extend(WaveSurfer.Drawer.Canvas, { | ||
|
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| // Takes in integer 0-255 and maps it to rgb string | ||
| getFrequencyRGB: function(colorValue) { | ||
| if (this.params.colorMap) { | ||
| // If the wavesurfer has a specified colour map | ||
| var rgb = this.params.colorMap[colorValue]; | ||
| return 'rgb(' + rgb[0] + ',' + rgb[1] + ',' + rgb[2] + ')'; | ||
| } else { | ||
| // If not just use gray scale | ||
| return 'rgb(' + colorValue + ',' + colorValue + ',' + colorValue + ')'; | ||
| } | ||
|
|
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| }, | ||
|
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| getFrequencies: function(buffer) { | ||
| var fftSamples = this.params.fftSamples || 512; | ||
| var channelOne = Array.prototype.slice.call(buffer.getChannelData(0)); | ||
| var bufferLength = buffer.length; | ||
| var sampleRate = buffer.sampleRate; | ||
| var frequencies = []; | ||
|
|
||
| if (! buffer) { | ||
| this.fireEvent('error', 'Web Audio buffer is not available'); | ||
| return; | ||
| } | ||
|
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| var noverlap = this.params.noverlap; | ||
| if (! noverlap) { | ||
| var uniqueSamplesPerPx = buffer.length / this.width; | ||
| noverlap = Math.max(0, Math.round(fftSamples - uniqueSamplesPerPx)); | ||
| } | ||
|
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| var fft = new WaveSurfer.FFT(fftSamples, sampleRate); | ||
|
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| var maxSlicesCount = Math.floor(bufferLength/ (fftSamples - noverlap)); | ||
|
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| var currentOffset = 0; | ||
|
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| while (currentOffset + fftSamples < channelOne.length) { | ||
| var segment = channelOne.slice(currentOffset, currentOffset + fftSamples); | ||
| var spectrum = fft.calculateSpectrum(segment); | ||
| var length = fftSamples / 2 + 1; | ||
| var array = new Uint8Array(length); | ||
| for (var j = 0; j < length; j++) { | ||
| array[j] = Math.max(-255, Math.log10(spectrum[j])*45); | ||
| } | ||
| frequencies.push(array); | ||
| currentOffset += (fftSamples - noverlap); | ||
| } | ||
|
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| return frequencies; | ||
| }, | ||
|
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| resample: function(oldMatrix) { | ||
| var columnsNumber = this.width; | ||
| var newMatrix = []; | ||
|
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| var oldPiece = 1 / oldMatrix.length; | ||
| var newPiece = 1 / columnsNumber; | ||
|
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| for (var i = 0; i < columnsNumber; i++) { | ||
| var column = new Array(oldMatrix[0].length); | ||
|
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| for (var j = 0; j < oldMatrix.length; j++) { | ||
| var oldStart = j * oldPiece; | ||
| var oldEnd = oldStart + oldPiece; | ||
| var newStart = i * newPiece; | ||
| var newEnd = newStart + newPiece; | ||
|
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| var overlap = (oldEnd <= newStart || newEnd <= oldStart) ? | ||
| 0 : | ||
| Math.min(Math.max(oldEnd, newStart), Math.max(newEnd, oldStart)) - | ||
| Math.max(Math.min(oldEnd, newStart), Math.min(newEnd, oldStart)); | ||
|
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| if (overlap > 0) { | ||
| for (var k = 0; k < oldMatrix[0].length; k++) { | ||
| if (column[k] == null) { | ||
| column[k] = 0; | ||
| } | ||
| column[k] += (overlap / newPiece) * oldMatrix[j][k]; | ||
| } | ||
| } | ||
| } | ||
|
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| var intColumn = new Uint8Array(oldMatrix[0].length); | ||
|
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| for (var k = 0; k < oldMatrix[0].length; k++) { | ||
| intColumn[k] = column[k]; | ||
| } | ||
|
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| newMatrix.push(intColumn); | ||
| } | ||
|
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| return newMatrix; | ||
| }, | ||
|
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| drawSpectrogram: function (buffer) { | ||
| var pixelRatio = this.params.pixelRatio; | ||
| var length = buffer.duration; | ||
| var height = (this.params.fftSamples / 2) * pixelRatio; | ||
| var frequenciesData = this.getFrequencies(buffer); | ||
|
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| var pixels = this.resample(frequenciesData); | ||
|
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| var heightFactor = pixelRatio; | ||
|
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| for (var i = 0; i < pixels.length; i++) { | ||
| for (var j = 0; j < pixels[i].length; j++) { | ||
| this.waveCc.fillStyle = this.getFrequencyRGB(pixels[i][j]); | ||
| this.waveCc.fillRect(i, height - j * heightFactor, 1, heightFactor); | ||
| } | ||
| } | ||
| } | ||
| }); | ||
|
|
||
| /** | ||
| * Override the method WaveSurfer.drawBuffer to pass in the this.backend.buffer to | ||
| * WaveSurfer.Drawer.drawPeaks since the buffer is needed to draw the spectrogram | ||
| */ | ||
| WaveSurfer.util.extend(WaveSurfer, { | ||
| drawBuffer: function () { | ||
| var nominalWidth = Math.round( | ||
| this.getDuration() * this.params.minPxPerSec * this.params.pixelRatio | ||
| ); | ||
| var parentWidth = this.drawer.getWidth(); | ||
| var width = nominalWidth; | ||
|
|
||
| // Fill container | ||
| if (this.params.fillParent && (!this.params.scrollParent || nominalWidth < parentWidth)) { | ||
| width = parentWidth; | ||
| } | ||
|
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| var peaks = this.backend.getPeaks(width); | ||
| this.drawer.drawPeaks(peaks, width, this.backend.buffer); | ||
| this.fireEvent('redraw', peaks, width); | ||
| }, | ||
| }); | ||
|
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| /** | ||
| * Override the methods WaveSurfer.Drawer.drawPeaks to support invisible and | ||
| * spectrogram representations | ||
| */ | ||
| WaveSurfer.util.extend(WaveSurfer.Drawer, { | ||
| drawPeaks: function (peaks, length, buffer) { | ||
| this.resetScroll(); | ||
| this.setWidth(length); | ||
| var visualization = this.params.visualization; | ||
| if (visualization === 'invisible') { | ||
| //draw nothing | ||
| } else if (visualization === 'spectrogram' && buffer) { | ||
| this.drawSpectrogram(buffer); | ||
| } else { | ||
| this.params.barWidth ? | ||
| this.drawBars(peaks) : | ||
| this.drawWave(peaks); | ||
| } | ||
| } | ||
| }); |
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