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aemphasis.js
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aemphasis.js
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const addFilter = require('./utils').addFilter;
const registerFilter = require('./utils').registerFilter;
/**
* Augment FfmpegCommand with the aemphasis function.
*
*
* @example
* ffmpeg().aemphasis()
* ... // 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 aemphasis function.
*/
function aemphasis(ffmpegCommand) {
registerFilter(ffmpegCommand, 'aemphasis', function() {
return new AemphasisFilter(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 AemphasisFilter {
/**
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
*/
constructor (ffmpeg) {
this.ffmpeg = ffmpeg;
AemphasisFilter.prototype.withLevel_in = this.level_in;
AemphasisFilter.prototype.withLevel_out = this.level_out;
AemphasisFilter.prototype.withMode = this.mode;
AemphasisFilter.prototype.withType = this.type;
}
/**
* Set input gain.
*
*
* @param val
*/
level_in(val) {
this._level_in = val;
return this;
}
/**
* Set output gain.
*
*
* @param val
*/
level_out(val) {
this._level_out = val;
return this;
}
/**
* Set filter mode. For restoring material use reproduction mode, otherwise
* use production mode. Default is reproduction mode.
*
*
* @param val
*/
mode(val) {
this._mode = val;
return this;
}
/**
*
* @param val
*/
type(val) {
this._type = val;
return this;
}
/**
* Creates this filter configuration and registers it in the ffmpeg instance.
* @return {ffmpegCommand} The ffmpeg instance.
*/
build() {
let opt = {};
if (this._level_in) {
opt['level_in'] = this._level_in;
}
if (this._level_out) {
opt['level_out'] = this._level_out;
}
if (this._mode) {
opt['mode'] = this._mode;
}
if (this._type) {
opt['type'] = this._type;
}
addFilter(this.ffmpeg, {
filter: 'aemphasis',
options: opt
});
return this.ffmpeg;
}
}
module.exports.aemphasis = aemphasis;