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aeval.js
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const addFilter = require('./utils').addFilter;
const registerFilter = require('./utils').registerFilter;
/**
* Augment FfmpegCommand with the aeval function.
*
*
* @example
* ffmpeg().aeval()
* ... // 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 aeval function.
*/
function aeval(ffmpegCommand) {
registerFilter(ffmpegCommand, 'aeval', function() {
return new AevalFilter(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 AevalFilter {
/**
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
*/
constructor (ffmpeg) {
this.ffmpeg = ffmpeg;
AevalFilter.prototype.withExprs = this.exprs;
AevalFilter.prototype.withChannel_layout = this.channel_layout;
}
/**
* Set the ’|’-separated expressions list for each separate channel. If
* the number of input channels is greater than the number of
* expressions, the last specified expression is used for the remaining
* output channels.
*
*
* @param val
*/
exprs(val) {
this._exprs = val;
return this;
}
/**
* Set output channel layout. If not specified, the channel layout is
* specified by the number of expressions. If set to ‘same’, it will
* use by default the same input channel layout.
*
* @param val
*/
channel_layout(val) {
this._channel_layout = val;
return this;
}
/**
* Creates this filter configuration and registers it in the ffmpeg instance.
* @return {ffmpegCommand} The ffmpeg instance.
*/
build() {
let opt = {};
if (this._exprs) {
opt['exprs'] = this._exprs;
}
if (this._channel_layout) {
opt['channel_layout'] = this._channel_layout;
}
addFilter(this.ffmpeg, {
filter: 'aeval',
options: opt
});
return this.ffmpeg;
}
}
module.exports.aeval = aeval;