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coreimage.js
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coreimage.js
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const addFilter = require('./utils').addFilter;
const registerFilter = require('./utils').registerFilter;
/**
* Augment FfmpegCommand with the coreimage function.
*
*
* @example
* ffmpeg().coreimage()
* ... // 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 coreimage function.
*/
function coreimage(ffmpegCommand) {
registerFilter(ffmpegCommand, 'coreimage', function() {
return new CoreimageFilter(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 CoreimageFilter {
/**
* @param {FfmpegCommand} ffmpegCommand The fluent-ffmpeg constructor.
*/
constructor (ffmpeg) {
this.ffmpeg = ffmpeg;
CoreimageFilter.prototype.withList_filters = this.list_filters;
CoreimageFilter.prototype.withFilter = this.filter;
CoreimageFilter.prototype.withOutput_rect = this.output_rect;
}
/**
* List all available filters and generators along with all their respective
* options as well as possible minimum and maximum values along with the default
* values.
*
* list_filters=true
*
*
*
* @param val
*/
list_filters(val) {
this._list_filters = val;
return this;
}
/**
* Specify all filters by their respective name and options.
* Use list_filters to determine all valid filter names and options.
* Numerical options are specified by a float value and are automatically clamped
* to their respective value range. Vector and color options have to be specified
* by a list of space separated float values. Character escaping has to be done.
* A special option name default is available to use default options for a
* filter.
*
* It is required to specify either default or at least one of the filter options.
* All omitted options are used with their default values.
* The syntax of the filter string is as follows:
*
* filter=<NAME>@<OPTION>=<VALUE>[@<OPTION>=<VALUE>][@...][#<NAME>@<OPTION>=<VALUE>[@<OPTION>=<VALUE>][@...]][#...]
*
*
*
* @param val
*/
filter(val) {
this._filter = val;
return this;
}
/**
* Specify a rectangle where the output of the filter chain is copied into the
* input image. It is given by a list of space separated float values:
*
* output_rect=x\ y\ width\ height
*
* If not given, the output rectangle equals the dimensions of the input image.
* The output rectangle is automatically cropped at the borders of the input
* image. Negative values are valid for each component.
*
* output_rect=25\ 25\ 100\ 100
*
*
* @param val
*/
output_rect(val) {
this._output_rect = val;
return this;
}
/**
* Creates this filter configuration and registers it in the ffmpeg instance.
* @return {ffmpegCommand} The ffmpeg instance.
*/
build() {
let opt = {};
if (this._list_filters) {
opt['list_filters'] = this._list_filters;
}
if (this._filter) {
opt['filter'] = this._filter;
}
if (this._output_rect) {
opt['output_rect'] = this._output_rect;
}
addFilter(this.ffmpeg, {
filter: 'coreimage',
options: opt
});
return this.ffmpeg;
}
}
module.exports.coreimage = coreimage;