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channelmap.js
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channelmap.js
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const addFilter = require('./utils').addFilter;
const registerFilter = require('./utils').registerFilter;
/**
* Augment FfmpegCommand with the channelmap function.
*
*
* @example
* ffmpeg().channelmap()
* ... // 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 channelmap function.
*/
function channelmap(ffmpegCommand) {
registerFilter(ffmpegCommand, 'channelmap', function() {
return new ChannelmapFilter(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 ChannelmapFilter {
/**
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
*/
constructor (ffmpeg) {
this.ffmpeg = ffmpeg;
ChannelmapFilter.prototype.withMap = this.map;
ChannelmapFilter.prototype.withChannel_layout = this.channel_layout;
}
/**
* Map channels from input to output. The argument is a ’|’-separated list of
* mappings, each in the in_channel-out_channel or
* in_channel form. in_channel can be either the name of the input
* channel (e.g. FL for front left) or its index in the input channel layout.
* out_channel is the name of the output channel or its index in the output
* channel layout. If out_channel is not given then it is implicitly an
* index, starting with zero and increasing by one for each mapping.
*
*
* @param val
*/
map(val) {
this._map = val;
return this;
}
/**
* The channel layout of the output stream.
*
* @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._map) {
opt['map'] = this._map;
}
if (this._channel_layout) {
opt['channel_layout'] = this._channel_layout;
}
addFilter(this.ffmpeg, {
filter: 'channelmap',
options: opt
});
return this.ffmpeg;
}
}
module.exports.channelmap = channelmap;