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abitscope.js
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abitscope.js
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const addFilter = require('./utils').addFilter;
const registerFilter = require('./utils').registerFilter;
/**
* Augment FfmpegCommand with the abitscope function.
*
*
* @example
* ffmpeg().abitscope()
* ... // 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 abitscope function.
*/
function abitscope(ffmpegCommand) {
registerFilter(ffmpegCommand, 'abitscope', function() {
return new AbitscopeFilter(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 AbitscopeFilter {
/**
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
*/
constructor (ffmpeg) {
this.ffmpeg = ffmpeg;
AbitscopeFilter.prototype.withRate = this.rate;
AbitscopeFilter.prototype.withSize = this.size;
AbitscopeFilter.prototype.withColors = this.colors;
}
/**
* Set frame rate, expressed as number of frames per second. Default
* value is "25".
*
*
* @param val
*/
rate(val) {
this._rate = val;
return this;
}
/**
* Specify the video size for the output. For the syntax of this option, check the
* (ffmpeg-utils)"Video size" section in the ffmpeg-utils manual.
* Default value is 1024x256.
*
*
* @param val
*/
size(val) {
this._size = val;
return this;
}
/**
* Specify list of colors separated by space or by ’|’ which will be used to
* draw channels. Unrecognized or missing colors will be replaced
* by white color.
*
* @param val
*/
colors(val) {
this._colors = val;
return this;
}
/**
* Creates this filter configuration and registers it in the ffmpeg instance.
* @return {ffmpegCommand} The ffmpeg instance.
*/
build() {
let opt = {};
if (this._rate) {
opt['rate'] = this._rate;
}
if (this._size) {
opt['size'] = this._size;
}
if (this._colors) {
opt['colors'] = this._colors;
}
addFilter(this.ffmpeg, {
filter: 'abitscope',
options: opt
});
return this.ffmpeg;
}
}
module.exports.abitscope = abitscope;