312 lines
11 KiB
HTML
312 lines
11 KiB
HTML
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<title>JSDoc: Source: ffprobe.js</title>
|
|
|
|
<script src="scripts/prettify/prettify.js"> </script>
|
|
<script src="scripts/prettify/lang-css.js"> </script>
|
|
<!--[if lt IE 9]>
|
|
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
|
|
<![endif]-->
|
|
<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
|
|
<link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<div id="main">
|
|
|
|
<h1 class="page-title">Source: ffprobe.js</h1>
|
|
|
|
|
|
|
|
|
|
|
|
<section>
|
|
<article>
|
|
<pre class="prettyprint source linenums"><code>/*jshint node:true, laxcomma:true*/
|
|
'use strict';
|
|
|
|
var spawn = require('child_process').spawn;
|
|
|
|
|
|
function legacyTag(key) { return key.match(/^TAG:/); }
|
|
function legacyDisposition(key) { return key.match(/^DISPOSITION:/); }
|
|
|
|
function parseFfprobeOutput(out) {
|
|
var lines = out.split(/\r\n|\r|\n/);
|
|
|
|
lines = lines.filter(function (line) {
|
|
return line.length > 0;
|
|
});
|
|
|
|
var data = {
|
|
streams: [],
|
|
format: {},
|
|
chapters: []
|
|
};
|
|
|
|
function parseBlock(name) {
|
|
var data = {};
|
|
|
|
var line = lines.shift();
|
|
while (typeof line !== 'undefined') {
|
|
if (line.toLowerCase() == '[/'+name+']') {
|
|
return data;
|
|
} else if (line.match(/^\[/)) {
|
|
line = lines.shift();
|
|
continue;
|
|
}
|
|
|
|
var kv = line.match(/^([^=]+)=(.*)$/);
|
|
if (kv) {
|
|
if (!(kv[1].match(/^TAG:/)) && kv[2].match(/^[0-9]+(\.[0-9]+)?$/)) {
|
|
data[kv[1]] = Number(kv[2]);
|
|
} else {
|
|
data[kv[1]] = kv[2];
|
|
}
|
|
}
|
|
|
|
line = lines.shift();
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
var line = lines.shift();
|
|
while (typeof line !== 'undefined') {
|
|
if (line.match(/^\[stream/i)) {
|
|
var stream = parseBlock('stream');
|
|
data.streams.push(stream);
|
|
} else if (line.match(/^\[chapter/i)) {
|
|
var chapter = parseBlock('chapter');
|
|
data.chapters.push(chapter);
|
|
} else if (line.toLowerCase() === '[format]') {
|
|
data.format = parseBlock('format');
|
|
}
|
|
|
|
line = lines.shift();
|
|
}
|
|
|
|
return data;
|
|
}
|
|
|
|
|
|
|
|
module.exports = function(proto) {
|
|
/**
|
|
* A callback passed to the {@link FfmpegCommand#ffprobe} method.
|
|
*
|
|
* @callback FfmpegCommand~ffprobeCallback
|
|
*
|
|
* @param {Error|null} err error object or null if no error happened
|
|
* @param {Object} ffprobeData ffprobe output data; this object
|
|
* has the same format as what the following command returns:
|
|
*
|
|
* `ffprobe -print_format json -show_streams -show_format INPUTFILE`
|
|
* @param {Array} ffprobeData.streams stream information
|
|
* @param {Object} ffprobeData.format format information
|
|
*/
|
|
|
|
/**
|
|
* Run ffprobe on last specified input
|
|
*
|
|
* @method FfmpegCommand#ffprobe
|
|
* @category Metadata
|
|
*
|
|
* @param {?Number} [index] 0-based index of input to probe (defaults to last input)
|
|
* @param {?String[]} [options] array of output options to return
|
|
* @param {FfmpegCommand~ffprobeCallback} callback callback function
|
|
*
|
|
*/
|
|
proto.ffprobe = function() {
|
|
var input, index = null, options = [], callback;
|
|
|
|
// the last argument should be the callback
|
|
var callback = arguments[arguments.length - 1];
|
|
|
|
var ended = false
|
|
function handleCallback(err, data) {
|
|
if (!ended) {
|
|
ended = true;
|
|
callback(err, data);
|
|
}
|
|
};
|
|
|
|
// map the arguments to the correct variable names
|
|
switch (arguments.length) {
|
|
case 3:
|
|
index = arguments[0];
|
|
options = arguments[1];
|
|
break;
|
|
case 2:
|
|
if (typeof arguments[0] === 'number') {
|
|
index = arguments[0];
|
|
} else if (Array.isArray(arguments[0])) {
|
|
options = arguments[0];
|
|
}
|
|
break;
|
|
}
|
|
|
|
|
|
if (index === null) {
|
|
if (!this._currentInput) {
|
|
return handleCallback(new Error('No input specified'));
|
|
}
|
|
|
|
input = this._currentInput;
|
|
} else {
|
|
input = this._inputs[index];
|
|
|
|
if (!input) {
|
|
return handleCallback(new Error('Invalid input index'));
|
|
}
|
|
}
|
|
|
|
// Find ffprobe
|
|
this._getFfprobePath(function(err, path) {
|
|
if (err) {
|
|
return handleCallback(err);
|
|
} else if (!path) {
|
|
return handleCallback(new Error('Cannot find ffprobe'));
|
|
}
|
|
|
|
var stdout = '';
|
|
var stdoutClosed = false;
|
|
var stderr = '';
|
|
var stderrClosed = false;
|
|
|
|
// Spawn ffprobe
|
|
var src = input.isStream ? 'pipe:0' : input.source;
|
|
var ffprobe = spawn(path, ['-show_streams', '-show_format'].concat(options, src));
|
|
|
|
if (input.isStream) {
|
|
// Skip errors on stdin. These get thrown when ffprobe is complete and
|
|
// there seems to be no way hook in and close stdin before it throws.
|
|
ffprobe.stdin.on('error', function(err) {
|
|
if (['ECONNRESET', 'EPIPE'].indexOf(err.code) >= 0) { return; }
|
|
handleCallback(err);
|
|
});
|
|
|
|
// Once ffprobe's input stream closes, we need no more data from the
|
|
// input
|
|
ffprobe.stdin.on('close', function() {
|
|
input.source.pause();
|
|
input.source.unpipe(ffprobe.stdin);
|
|
});
|
|
|
|
input.source.pipe(ffprobe.stdin);
|
|
}
|
|
|
|
ffprobe.on('error', callback);
|
|
|
|
// Ensure we wait for captured streams to end before calling callback
|
|
var exitError = null;
|
|
function handleExit(err) {
|
|
if (err) {
|
|
exitError = err;
|
|
}
|
|
|
|
if (processExited && stdoutClosed && stderrClosed) {
|
|
if (exitError) {
|
|
if (stderr) {
|
|
exitError.message += '\n' + stderr;
|
|
}
|
|
|
|
return handleCallback(exitError);
|
|
}
|
|
|
|
// Process output
|
|
var data = parseFfprobeOutput(stdout);
|
|
|
|
// Handle legacy output with "TAG:x" and "DISPOSITION:x" keys
|
|
[data.format].concat(data.streams).forEach(function(target) {
|
|
if (target) {
|
|
var legacyTagKeys = Object.keys(target).filter(legacyTag);
|
|
|
|
if (legacyTagKeys.length) {
|
|
target.tags = target.tags || {};
|
|
|
|
legacyTagKeys.forEach(function(tagKey) {
|
|
target.tags[tagKey.substr(4)] = target[tagKey];
|
|
delete target[tagKey];
|
|
});
|
|
}
|
|
|
|
var legacyDispositionKeys = Object.keys(target).filter(legacyDisposition);
|
|
|
|
if (legacyDispositionKeys.length) {
|
|
target.disposition = target.disposition || {};
|
|
|
|
legacyDispositionKeys.forEach(function(dispositionKey) {
|
|
target.disposition[dispositionKey.substr(12)] = target[dispositionKey];
|
|
delete target[dispositionKey];
|
|
});
|
|
}
|
|
}
|
|
});
|
|
|
|
handleCallback(null, data);
|
|
}
|
|
}
|
|
|
|
// Handle ffprobe exit
|
|
var processExited = false;
|
|
ffprobe.on('exit', function(code, signal) {
|
|
processExited = true;
|
|
|
|
if (code) {
|
|
handleExit(new Error('ffprobe exited with code ' + code));
|
|
} else if (signal) {
|
|
handleExit(new Error('ffprobe was killed with signal ' + signal));
|
|
} else {
|
|
handleExit();
|
|
}
|
|
});
|
|
|
|
// Handle stdout/stderr streams
|
|
ffprobe.stdout.on('data', function(data) {
|
|
stdout += data;
|
|
});
|
|
|
|
ffprobe.stdout.on('close', function() {
|
|
stdoutClosed = true;
|
|
handleExit();
|
|
});
|
|
|
|
ffprobe.stderr.on('data', function(data) {
|
|
stderr += data;
|
|
});
|
|
|
|
ffprobe.stderr.on('close', function() {
|
|
stderrClosed = true;
|
|
handleExit();
|
|
});
|
|
});
|
|
};
|
|
};
|
|
</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>
|
|
</nav>
|
|
|
|
<br clear="both">
|
|
|
|
<footer>
|
|
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)
|
|
</footer>
|
|
|
|
<script> prettyPrint(); </script>
|
|
<script src="scripts/linenumber.js"> </script>
|
|
</body>
|
|
</html>
|