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bass.js
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const addFilter = require('./utils').addFilter;
const registerFilter = require('./utils').registerFilter;
/**
* Augment FfmpegCommand with the bass function.
*
*
* @example
* ffmpeg().bass()
* ... // call filter configuration functions
* .build() // end filter configuration
* ...
* .applyFilters() // called once all filters have been configured
*
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
* @return {FfmpegCommand} The ffmpegCommand augmented with the bass function.
*/
function bass(ffmpegCommand) {
registerFilter(ffmpegCommand, 'bass', function() {
return new BassFilter(this);
});
return ffmpegCommand;
}
/**
* Class exposing methods to configure the vstack filter in a builder pattern way.
*
* See {@link http://ffmpeg.org/ffmpeg-filters.html#vstack} for a description
* of each configuration option.
*/
class BassFilter {
/**
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
*/
constructor (ffmpeg) {
this.ffmpeg = ffmpeg;
BassFilter.prototype.withGain = this.gain;
BassFilter.prototype.withFrequency = this.frequency;
BassFilter.prototype.withWidth_type = this.width_type;
BassFilter.prototype.withWidth = this.width;
}
/**
* Give the gain at 0 Hz. Its useful range is about -20
* (for a large cut) to +20 (for a large boost).
* Beware of clipping when using a positive gain.
*
*
* @param val
*/
gain(val) {
this._gain = val;
return this;
}
/**
* Set the filter’s central frequency and so can be used
* to extend or reduce the frequency range to be boosted or cut.
* The default value is 100 Hz.
*
*
* @param val
*/
frequency(val) {
this._frequency = val;
return this;
}
/**
*
* @param val
*/
width_type(val) {
this._width_type = val;
return this;
}
/**
* Determine how steep is the filter’s shelf transition.
*
* @param val
*/
width(val) {
this._width = val;
return this;
}
/**
* Creates this filter configuration and registers it in the ffmpeg instance.
* @return {ffmpegCommand} The ffmpeg instance.
*/
build() {
let opt = {};
if (this._gain) {
opt['gain'] = this._gain;
}
if (this._frequency) {
opt['frequency'] = this._frequency;
}
if (this._width_type) {
opt['width_type'] = this._width_type;
}
if (this._width) {
opt['width'] = this._width;
}
addFilter(this.ffmpeg, {
filter: 'bass',
options: opt
});
return this.ffmpeg;
}
}
module.exports.bass = bass;