716 lines
23 KiB
HTML
716 lines
23 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>JSDoc: Source: capabilities.js</title>
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<script src="scripts/prettify/prettify.js"> </script>
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<script src="scripts/prettify/lang-css.js"> </script>
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<!--[if lt IE 9]>
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<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
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<![endif]-->
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<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
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<link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
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</head>
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<body>
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<div id="main">
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<h1 class="page-title">Source: capabilities.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>/*jshint node:true*/
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'use strict';
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var fs = require('fs');
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var path = require('path');
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var async = require('async');
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var utils = require('./utils');
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/*
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*! Capability helpers
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*/
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var avCodecRegexp = /^\s*([D ])([E ])([VAS])([S ])([D ])([T ]) ([^ ]+) +(.*)$/;
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var ffCodecRegexp = /^\s*([D\.])([E\.])([VAS])([I\.])([L\.])([S\.]) ([^ ]+) +(.*)$/;
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var ffEncodersRegexp = /\(encoders:([^\)]+)\)/;
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var ffDecodersRegexp = /\(decoders:([^\)]+)\)/;
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var encodersRegexp = /^\s*([VAS\.])([F\.])([S\.])([X\.])([B\.])([D\.]) ([^ ]+) +(.*)$/;
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var formatRegexp = /^\s*([D ])([E ]) ([^ ]+) +(.*)$/;
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var lineBreakRegexp = /\r\n|\r|\n/;
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var filterRegexp = /^(?: [T\.][S\.][C\.] )?([^ ]+) +(AA?|VV?|\|)->(AA?|VV?|\|) +(.*)$/;
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var cache = {};
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module.exports = function(proto) {
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/**
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* Manually define the ffmpeg binary full path.
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*
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* @method FfmpegCommand#setFfmpegPath
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*
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* @param {String} ffmpegPath The full path to the ffmpeg binary.
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* @return FfmpegCommand
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*/
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proto.setFfmpegPath = function(ffmpegPath) {
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cache.ffmpegPath = ffmpegPath;
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return this;
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};
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/**
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* Manually define the ffprobe binary full path.
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*
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* @method FfmpegCommand#setFfprobePath
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*
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* @param {String} ffprobePath The full path to the ffprobe binary.
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* @return FfmpegCommand
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*/
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proto.setFfprobePath = function(ffprobePath) {
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cache.ffprobePath = ffprobePath;
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return this;
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};
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/**
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* Manually define the flvtool2/flvmeta binary full path.
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*
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* @method FfmpegCommand#setFlvtoolPath
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*
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* @param {String} flvtool The full path to the flvtool2 or flvmeta binary.
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* @return FfmpegCommand
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*/
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proto.setFlvtoolPath = function(flvtool) {
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cache.flvtoolPath = flvtool;
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return this;
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};
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/**
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* Forget executable paths
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*
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* (only used for testing purposes)
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*
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* @method FfmpegCommand#_forgetPaths
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* @private
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*/
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proto._forgetPaths = function() {
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delete cache.ffmpegPath;
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delete cache.ffprobePath;
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delete cache.flvtoolPath;
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};
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/**
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* Check for ffmpeg availability
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*
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* If the FFMPEG_PATH environment variable is set, try to use it.
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* If it is unset or incorrect, try to find ffmpeg in the PATH instead.
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*
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* @method FfmpegCommand#_getFfmpegPath
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* @param {Function} callback callback with signature (err, path)
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* @private
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*/
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proto._getFfmpegPath = function(callback) {
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if ('ffmpegPath' in cache) {
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return callback(null, cache.ffmpegPath);
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}
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async.waterfall([
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// Try FFMPEG_PATH
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function(cb) {
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if (process.env.FFMPEG_PATH) {
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fs.exists(process.env.FFMPEG_PATH, function(exists) {
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if (exists) {
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cb(null, process.env.FFMPEG_PATH);
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} else {
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cb(null, '');
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}
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});
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} else {
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cb(null, '');
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}
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},
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// Search in the PATH
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function(ffmpeg, cb) {
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if (ffmpeg.length) {
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return cb(null, ffmpeg);
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}
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utils.which('ffmpeg', function(err, ffmpeg) {
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cb(err, ffmpeg);
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});
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}
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], function(err, ffmpeg) {
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if (err) {
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callback(err);
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} else {
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callback(null, cache.ffmpegPath = (ffmpeg || ''));
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}
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});
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};
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/**
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* Check for ffprobe availability
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*
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* If the FFPROBE_PATH environment variable is set, try to use it.
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* If it is unset or incorrect, try to find ffprobe in the PATH instead.
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* If this still fails, try to find ffprobe in the same directory as ffmpeg.
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*
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* @method FfmpegCommand#_getFfprobePath
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* @param {Function} callback callback with signature (err, path)
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* @private
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*/
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proto._getFfprobePath = function(callback) {
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var self = this;
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if ('ffprobePath' in cache) {
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return callback(null, cache.ffprobePath);
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}
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async.waterfall([
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// Try FFPROBE_PATH
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function(cb) {
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if (process.env.FFPROBE_PATH) {
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fs.exists(process.env.FFPROBE_PATH, function(exists) {
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cb(null, exists ? process.env.FFPROBE_PATH : '');
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});
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} else {
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cb(null, '');
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}
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},
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// Search in the PATH
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function(ffprobe, cb) {
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if (ffprobe.length) {
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return cb(null, ffprobe);
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}
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utils.which('ffprobe', function(err, ffprobe) {
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cb(err, ffprobe);
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});
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},
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// Search in the same directory as ffmpeg
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function(ffprobe, cb) {
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if (ffprobe.length) {
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return cb(null, ffprobe);
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}
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self._getFfmpegPath(function(err, ffmpeg) {
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if (err) {
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cb(err);
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} else if (ffmpeg.length) {
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var name = utils.isWindows ? 'ffprobe.exe' : 'ffprobe';
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var ffprobe = path.join(path.dirname(ffmpeg), name);
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fs.exists(ffprobe, function(exists) {
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cb(null, exists ? ffprobe : '');
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});
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} else {
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cb(null, '');
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}
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});
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}
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], function(err, ffprobe) {
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if (err) {
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callback(err);
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} else {
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callback(null, cache.ffprobePath = (ffprobe || ''));
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}
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});
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};
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/**
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* Check for flvtool2/flvmeta availability
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*
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* If the FLVTOOL2_PATH or FLVMETA_PATH environment variable are set, try to use them.
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* If both are either unset or incorrect, try to find flvtool2 or flvmeta in the PATH instead.
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*
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* @method FfmpegCommand#_getFlvtoolPath
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* @param {Function} callback callback with signature (err, path)
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* @private
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*/
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proto._getFlvtoolPath = function(callback) {
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if ('flvtoolPath' in cache) {
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return callback(null, cache.flvtoolPath);
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}
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async.waterfall([
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// Try FLVMETA_PATH
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function(cb) {
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if (process.env.FLVMETA_PATH) {
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fs.exists(process.env.FLVMETA_PATH, function(exists) {
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cb(null, exists ? process.env.FLVMETA_PATH : '');
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});
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} else {
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cb(null, '');
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}
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},
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// Try FLVTOOL2_PATH
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function(flvtool, cb) {
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if (flvtool.length) {
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return cb(null, flvtool);
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}
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if (process.env.FLVTOOL2_PATH) {
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fs.exists(process.env.FLVTOOL2_PATH, function(exists) {
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cb(null, exists ? process.env.FLVTOOL2_PATH : '');
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});
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} else {
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cb(null, '');
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}
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},
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// Search for flvmeta in the PATH
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function(flvtool, cb) {
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if (flvtool.length) {
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return cb(null, flvtool);
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}
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utils.which('flvmeta', function(err, flvmeta) {
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cb(err, flvmeta);
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});
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},
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// Search for flvtool2 in the PATH
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function(flvtool, cb) {
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if (flvtool.length) {
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return cb(null, flvtool);
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}
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utils.which('flvtool2', function(err, flvtool2) {
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cb(err, flvtool2);
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});
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},
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], function(err, flvtool) {
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if (err) {
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callback(err);
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} else {
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callback(null, cache.flvtoolPath = (flvtool || ''));
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}
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});
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};
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/**
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* A callback passed to {@link FfmpegCommand#availableFilters}.
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*
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* @callback FfmpegCommand~filterCallback
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* @param {Error|null} err error object or null if no error happened
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* @param {Object} filters filter object with filter names as keys and the following
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* properties for each filter:
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* @param {String} filters.description filter description
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* @param {String} filters.input input type, one of 'audio', 'video' and 'none'
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* @param {Boolean} filters.multipleInputs whether the filter supports multiple inputs
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* @param {String} filters.output output type, one of 'audio', 'video' and 'none'
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* @param {Boolean} filters.multipleOutputs whether the filter supports multiple outputs
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*/
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/**
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* Query ffmpeg for available filters
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*
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* @method FfmpegCommand#availableFilters
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* @category Capabilities
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* @aliases getAvailableFilters
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*
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* @param {FfmpegCommand~filterCallback} callback callback function
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*/
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proto.availableFilters =
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proto.getAvailableFilters = function(callback) {
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if ('filters' in cache) {
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return callback(null, cache.filters);
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}
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this._spawnFfmpeg(['-filters'], { captureStdout: true, stdoutLines: 0 }, function (err, stdoutRing) {
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if (err) {
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return callback(err);
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}
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var stdout = stdoutRing.get();
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var lines = stdout.split('\n');
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var data = {};
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var types = { A: 'audio', V: 'video', '|': 'none' };
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lines.forEach(function(line) {
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var match = line.match(filterRegexp);
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if (match) {
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data[match[1]] = {
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description: match[4],
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input: types[match[2].charAt(0)],
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multipleInputs: match[2].length > 1,
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output: types[match[3].charAt(0)],
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multipleOutputs: match[3].length > 1
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};
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}
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});
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callback(null, cache.filters = data);
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});
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};
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/**
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* A callback passed to {@link FfmpegCommand#availableCodecs}.
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*
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* @callback FfmpegCommand~codecCallback
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* @param {Error|null} err error object or null if no error happened
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* @param {Object} codecs codec object with codec names as keys and the following
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* properties for each codec (more properties may be available depending on the
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* ffmpeg version used):
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* @param {String} codecs.description codec description
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* @param {Boolean} codecs.canDecode whether the codec is able to decode streams
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* @param {Boolean} codecs.canEncode whether the codec is able to encode streams
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*/
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/**
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* Query ffmpeg for available codecs
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*
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* @method FfmpegCommand#availableCodecs
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* @category Capabilities
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* @aliases getAvailableCodecs
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*
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* @param {FfmpegCommand~codecCallback} callback callback function
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*/
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proto.availableCodecs =
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proto.getAvailableCodecs = function(callback) {
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if ('codecs' in cache) {
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return callback(null, cache.codecs);
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}
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this._spawnFfmpeg(['-codecs'], { captureStdout: true, stdoutLines: 0 }, function(err, stdoutRing) {
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if (err) {
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return callback(err);
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}
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var stdout = stdoutRing.get();
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var lines = stdout.split(lineBreakRegexp);
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var data = {};
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lines.forEach(function(line) {
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var match = line.match(avCodecRegexp);
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if (match && match[7] !== '=') {
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data[match[7]] = {
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type: { 'V': 'video', 'A': 'audio', 'S': 'subtitle' }[match[3]],
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description: match[8],
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canDecode: match[1] === 'D',
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canEncode: match[2] === 'E',
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drawHorizBand: match[4] === 'S',
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directRendering: match[5] === 'D',
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weirdFrameTruncation: match[6] === 'T'
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};
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}
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match = line.match(ffCodecRegexp);
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if (match && match[7] !== '=') {
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var codecData = data[match[7]] = {
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type: { 'V': 'video', 'A': 'audio', 'S': 'subtitle' }[match[3]],
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description: match[8],
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canDecode: match[1] === 'D',
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canEncode: match[2] === 'E',
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intraFrameOnly: match[4] === 'I',
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isLossy: match[5] === 'L',
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isLossless: match[6] === 'S'
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};
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var encoders = codecData.description.match(ffEncodersRegexp);
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encoders = encoders ? encoders[1].trim().split(' ') : [];
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var decoders = codecData.description.match(ffDecodersRegexp);
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decoders = decoders ? decoders[1].trim().split(' ') : [];
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if (encoders.length || decoders.length) {
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var coderData = {};
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utils.copy(codecData, coderData);
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delete coderData.canEncode;
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delete coderData.canDecode;
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encoders.forEach(function(name) {
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data[name] = {};
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utils.copy(coderData, data[name]);
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data[name].canEncode = true;
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});
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decoders.forEach(function(name) {
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if (name in data) {
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data[name].canDecode = true;
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} else {
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data[name] = {};
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utils.copy(coderData, data[name]);
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data[name].canDecode = true;
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}
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});
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}
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}
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});
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callback(null, cache.codecs = data);
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});
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};
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/**
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* A callback passed to {@link FfmpegCommand#availableEncoders}.
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*
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* @callback FfmpegCommand~encodersCallback
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* @param {Error|null} err error object or null if no error happened
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* @param {Object} encoders encoders object with encoder names as keys and the following
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* properties for each encoder:
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* @param {String} encoders.description codec description
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* @param {Boolean} encoders.type "audio", "video" or "subtitle"
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* @param {Boolean} encoders.frameMT whether the encoder is able to do frame-level multithreading
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* @param {Boolean} encoders.sliceMT whether the encoder is able to do slice-level multithreading
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* @param {Boolean} encoders.experimental whether the encoder is experimental
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* @param {Boolean} encoders.drawHorizBand whether the encoder supports draw_horiz_band
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* @param {Boolean} encoders.directRendering whether the encoder supports direct encoding method 1
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*/
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/**
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* Query ffmpeg for available encoders
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*
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* @method FfmpegCommand#availableEncoders
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* @category Capabilities
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* @aliases getAvailableEncoders
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*
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* @param {FfmpegCommand~encodersCallback} callback callback function
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*/
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proto.availableEncoders =
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proto.getAvailableEncoders = function(callback) {
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if ('encoders' in cache) {
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return callback(null, cache.encoders);
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}
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this._spawnFfmpeg(['-encoders'], { captureStdout: true, stdoutLines: 0 }, function(err, stdoutRing) {
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if (err) {
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return callback(err);
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}
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var stdout = stdoutRing.get();
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var lines = stdout.split(lineBreakRegexp);
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var data = {};
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lines.forEach(function(line) {
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var match = line.match(encodersRegexp);
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if (match && match[7] !== '=') {
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data[match[7]] = {
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type: { 'V': 'video', 'A': 'audio', 'S': 'subtitle' }[match[1]],
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description: match[8],
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frameMT: match[2] === 'F',
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sliceMT: match[3] === 'S',
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experimental: match[4] === 'X',
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drawHorizBand: match[5] === 'B',
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directRendering: match[6] === 'D'
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};
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}
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});
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callback(null, cache.encoders = data);
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});
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};
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/**
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* A callback passed to {@link FfmpegCommand#availableFormats}.
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*
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* @callback FfmpegCommand~formatCallback
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* @param {Error|null} err error object or null if no error happened
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* @param {Object} formats format object with format names as keys and the following
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* properties for each format:
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* @param {String} formats.description format description
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* @param {Boolean} formats.canDemux whether the format is able to demux streams from an input file
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* @param {Boolean} formats.canMux whether the format is able to mux streams into an output file
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*/
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/**
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* Query ffmpeg for available formats
|
|
*
|
|
* @method FfmpegCommand#availableFormats
|
|
* @category Capabilities
|
|
* @aliases getAvailableFormats
|
|
*
|
|
* @param {FfmpegCommand~formatCallback} callback callback function
|
|
*/
|
|
proto.availableFormats =
|
|
proto.getAvailableFormats = function(callback) {
|
|
if ('formats' in cache) {
|
|
return callback(null, cache.formats);
|
|
}
|
|
|
|
// Run ffmpeg -formats
|
|
this._spawnFfmpeg(['-formats'], { captureStdout: true, stdoutLines: 0 }, function (err, stdoutRing) {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
|
|
// Parse output
|
|
var stdout = stdoutRing.get();
|
|
var lines = stdout.split(lineBreakRegexp);
|
|
var data = {};
|
|
|
|
lines.forEach(function(line) {
|
|
var match = line.match(formatRegexp);
|
|
if (match) {
|
|
match[3].split(',').forEach(function(format) {
|
|
if (!(format in data)) {
|
|
data[format] = {
|
|
description: match[4],
|
|
canDemux: false,
|
|
canMux: false
|
|
};
|
|
}
|
|
|
|
if (match[1] === 'D') {
|
|
data[format].canDemux = true;
|
|
}
|
|
if (match[2] === 'E') {
|
|
data[format].canMux = true;
|
|
}
|
|
});
|
|
}
|
|
});
|
|
|
|
callback(null, cache.formats = data);
|
|
});
|
|
};
|
|
|
|
|
|
/**
|
|
* Check capabilities before executing a command
|
|
*
|
|
* Checks whether all used codecs and formats are indeed available
|
|
*
|
|
* @method FfmpegCommand#_checkCapabilities
|
|
* @param {Function} callback callback with signature (err)
|
|
* @private
|
|
*/
|
|
proto._checkCapabilities = function(callback) {
|
|
var self = this;
|
|
async.waterfall([
|
|
// Get available formats
|
|
function(cb) {
|
|
self.availableFormats(cb);
|
|
},
|
|
|
|
// Check whether specified formats are available
|
|
function(formats, cb) {
|
|
var unavailable;
|
|
|
|
// Output format(s)
|
|
unavailable = self._outputs
|
|
.reduce(function(fmts, output) {
|
|
var format = output.options.find('-f', 1);
|
|
if (format) {
|
|
if (!(format[0] in formats) || !(formats[format[0]].canMux)) {
|
|
fmts.push(format);
|
|
}
|
|
}
|
|
|
|
return fmts;
|
|
}, []);
|
|
|
|
if (unavailable.length === 1) {
|
|
return cb(new Error('Output format ' + unavailable[0] + ' is not available'));
|
|
} else if (unavailable.length > 1) {
|
|
return cb(new Error('Output formats ' + unavailable.join(', ') + ' are not available'));
|
|
}
|
|
|
|
// Input format(s)
|
|
unavailable = self._inputs
|
|
.reduce(function(fmts, input) {
|
|
var format = input.options.find('-f', 1);
|
|
if (format) {
|
|
if (!(format[0] in formats) || !(formats[format[0]].canDemux)) {
|
|
fmts.push(format[0]);
|
|
}
|
|
}
|
|
|
|
return fmts;
|
|
}, []);
|
|
|
|
if (unavailable.length === 1) {
|
|
return cb(new Error('Input format ' + unavailable[0] + ' is not available'));
|
|
} else if (unavailable.length > 1) {
|
|
return cb(new Error('Input formats ' + unavailable.join(', ') + ' are not available'));
|
|
}
|
|
|
|
cb();
|
|
},
|
|
|
|
// Get available codecs
|
|
function(cb) {
|
|
self.availableEncoders(cb);
|
|
},
|
|
|
|
// Check whether specified codecs are available and add strict experimental options if needed
|
|
function(encoders, cb) {
|
|
var unavailable;
|
|
|
|
// Audio codec(s)
|
|
unavailable = self._outputs.reduce(function(cdcs, output) {
|
|
var acodec = output.audio.find('-acodec', 1);
|
|
if (acodec && acodec[0] !== 'copy') {
|
|
if (!(acodec[0] in encoders) || encoders[acodec[0]].type !== 'audio') {
|
|
cdcs.push(acodec[0]);
|
|
}
|
|
}
|
|
|
|
return cdcs;
|
|
}, []);
|
|
|
|
if (unavailable.length === 1) {
|
|
return cb(new Error('Audio codec ' + unavailable[0] + ' is not available'));
|
|
} else if (unavailable.length > 1) {
|
|
return cb(new Error('Audio codecs ' + unavailable.join(', ') + ' are not available'));
|
|
}
|
|
|
|
// Video codec(s)
|
|
unavailable = self._outputs.reduce(function(cdcs, output) {
|
|
var vcodec = output.video.find('-vcodec', 1);
|
|
if (vcodec && vcodec[0] !== 'copy') {
|
|
if (!(vcodec[0] in encoders) || encoders[vcodec[0]].type !== 'video') {
|
|
cdcs.push(vcodec[0]);
|
|
}
|
|
}
|
|
|
|
return cdcs;
|
|
}, []);
|
|
|
|
if (unavailable.length === 1) {
|
|
return cb(new Error('Video codec ' + unavailable[0] + ' is not available'));
|
|
} else if (unavailable.length > 1) {
|
|
return cb(new Error('Video codecs ' + unavailable.join(', ') + ' are not available'));
|
|
}
|
|
|
|
cb();
|
|
}
|
|
], callback);
|
|
};
|
|
};
|
|
</code></pre>
|
|
</article>
|
|
</section>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
<nav>
|
|
<h2><a href="index.html">Index</a></h2><ul><li><a href="index.html#installation">Installation</a></li><ul></ul><li><a href="index.html#usage">Usage</a></li><ul><li><a href="index.html#prerequisites">Prerequisites</a></li><li><a href="index.html#creating-an-ffmpeg-command">Creating an FFmpeg command</a></li><li><a href="index.html#specifying-inputs">Specifying inputs</a></li><li><a href="index.html#input-options">Input options</a></li><li><a href="index.html#audio-options">Audio options</a></li><li><a href="index.html#video-options">Video options</a></li><li><a href="index.html#video-frame-size-options">Video frame size options</a></li><li><a href="index.html#specifying-multiple-outputs">Specifying multiple outputs</a></li><li><a href="index.html#output-options">Output options</a></li><li><a href="index.html#miscellaneous-options">Miscellaneous options</a></li><li><a href="index.html#setting-event-handlers">Setting event handlers</a></li><li><a href="index.html#starting-ffmpeg-processing">Starting FFmpeg processing</a></li><li><a href="index.html#controlling-the-ffmpeg-process">Controlling the FFmpeg process</a></li><li><a href="index.html#reading-video-metadata">Reading video metadata</a></li><li><a href="index.html#querying-ffmpeg-capabilities">Querying ffmpeg capabilities</a></li><li><a href="index.html#cloning-an-ffmpegcommand">Cloning an FfmpegCommand</a></li></ul><li><a href="index.html#contributing">Contributing</a></li><ul><li><a href="index.html#code-contributions">Code contributions</a></li><li><a href="index.html#documentation-contributions">Documentation contributions</a></li><li><a href="index.html#updating-the-documentation">Updating the documentation</a></li><li><a href="index.html#running-tests">Running tests</a></li></ul><li><a href="index.html#main-contributors">Main contributors</a></li><ul></ul><li><a href="index.html#license">License</a></li><ul></ul></ul><h3>Classes</h3><ul><li><a href="FfmpegCommand.html">FfmpegCommand</a></li><ul><li> <a href="FfmpegCommand.html#audio-methods">Audio methods</a></li><li> <a href="FfmpegCommand.html#capabilities-methods">Capabilities methods</a></li><li> <a href="FfmpegCommand.html#custom-options-methods">Custom options methods</a></li><li> <a href="FfmpegCommand.html#input-methods">Input methods</a></li><li> <a href="FfmpegCommand.html#metadata-methods">Metadata methods</a></li><li> <a href="FfmpegCommand.html#miscellaneous-methods">Miscellaneous methods</a></li><li> <a href="FfmpegCommand.html#other-methods">Other methods</a></li><li> <a href="FfmpegCommand.html#output-methods">Output methods</a></li><li> <a href="FfmpegCommand.html#processing-methods">Processing methods</a></li><li> <a href="FfmpegCommand.html#video-methods">Video methods</a></li><li> <a href="FfmpegCommand.html#video-size-methods">Video size methods</a></li></ul></ul>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.4.0</a> on Sun May 01 2016 12:10:37 GMT+0200 (CEST)
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