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ahistogram.js
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const addFilter = require('./utils').addFilter;
const registerFilter = require('./utils').registerFilter;
/**
* Augment FfmpegCommand with the ahistogram function.
*
*
* @example
* ffmpeg().ahistogram()
* ... // 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 ahistogram function.
*/
function ahistogram(ffmpegCommand) {
registerFilter(ffmpegCommand, 'ahistogram', function() {
return new AhistogramFilter(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 AhistogramFilter {
/**
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
*/
constructor (ffmpeg) {
this.ffmpeg = ffmpeg;
AhistogramFilter.prototype.withDmode = this.dmode;
AhistogramFilter.prototype.withRate = this.rate;
AhistogramFilter.prototype.withSize = this.size;
AhistogramFilter.prototype.withScale = this.scale;
AhistogramFilter.prototype.withAscale = this.ascale;
AhistogramFilter.prototype.withAcount = this.acount;
AhistogramFilter.prototype.withRheight = this.rheight;
AhistogramFilter.prototype.withSlide = this.slide;
}
/**
*
* @param val
*/
dmode(val) {
this._dmode = val;
return this;
}
/**
* 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 hd720.
*
*
* @param val
*/
size(val) {
this._size = val;
return this;
}
/**
*
* @param val
*/
scale(val) {
this._scale = val;
return this;
}
/**
*
* @param val
*/
ascale(val) {
this._ascale = val;
return this;
}
/**
* Set how much frames to accumulate in histogram.
* Defauls is 1. Setting this to -1 accumulates all frames.
*
*
* @param val
*/
acount(val) {
this._acount = val;
return this;
}
/**
* Set histogram ratio of window height.
*
*
* @param val
*/
rheight(val) {
this._rheight = val;
return this;
}
/**
*
* @param val
*/
slide(val) {
this._slide = val;
return this;
}
/**
* Creates this filter configuration and registers it in the ffmpeg instance.
* @return {ffmpegCommand} The ffmpeg instance.
*/
build() {
let opt = {};
if (this._dmode) {
opt['dmode'] = this._dmode;
}
if (this._rate) {
opt['rate'] = this._rate;
}
if (this._size) {
opt['size'] = this._size;
}
if (this._scale) {
opt['scale'] = this._scale;
}
if (this._ascale) {
opt['ascale'] = this._ascale;
}
if (this._acount) {
opt['acount'] = this._acount;
}
if (this._rheight) {
opt['rheight'] = this._rheight;
}
if (this._slide) {
opt['slide'] = this._slide;
}
addFilter(this.ffmpeg, {
filter: 'ahistogram',
options: opt
});
return this.ffmpeg;
}
}
module.exports.ahistogram = ahistogram;