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musix-oss/node_modules/ffmpeg/lib/utils.js

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2020-03-03 20:30:50 +00:00
var exec = require('child_process').exec
, fs = require('fs')
, path = require('path');
var errors = require('./errors');
/**
* Exec the list of commands and call the callback function at the end of the process
*/
module.exports.exec = function (commands, settings, callback) {
// Create final command line
var finalCommand = commands.join(" ");
// Create the timeoutId for stop the timeout at the end the process
var timeoutID = null;
// Exec the command
var process = exec(finalCommand, settings, function (error, stdout, stderr) {
// Clear timeout if 'timeoutID' are setted
if (timeoutID !== null) clearTimeout(timeoutID);
// Call the callback function
callback(error, stdout, stderr);
});
// Verify if the timeout are setting
if (settings.timeout > 0) {
// Set the timeout
timeoutID = setTimeout(function () {
process.kill();
}, 100);
}
}
/**
* Check if object is empty
*/
module.exports.isEmptyObj = function (obj) {
// Scan all properties
for(var prop in obj)
// Check if obj has a property
if(obj.hasOwnProperty(prop))
// The object is not empty
return false;
// The object is empty
return true;
}
/**
* Merge obj1 into obj
*/
module.exports.mergeObject = function (obj, obj1) {
// Check if there are options set
if (!module.exports.isEmptyObj(obj1)) {
// Scan all settings
for (var key in obj1) {
// Check if the option is valid
if (!obj.hasOwnProperty(key))
throw errors.renderError('invalid_option_name', key);
// Set new option value
obj[key] = obj1[key];
}
}
}
/**
* Calculate the duration in seconds from the string retrieved by the ffmpeg info
*/
module.exports.durationToSeconds = function(duration) {
var parts = duration.substr(0,8).split(':');
return parseInt(parts[0], 10) * 3600 + parseInt(parts[1], 10) * 60 + parseInt(parts[2], 10);
};
/**
* Calculate the greatest common divisor
*/
module.exports.gcd = function (a, b) {
if (b === 0) return a;
return module.exports.gcd(b, a % b);
}
/**
* Offers functionality similar to mkdir -p
*/
module.exports.mkdir = function (dirpath, mode, callback, position) {
// Split all directories
var parts = path.normalize(dirpath).split('/');
// If the first part is empty then remove this part
if (parts[0] == "")
parts = parts.slice(1);
// Set the initial configuration
mode = mode || 0777;
position = position || 0;
// Check se current position is greater than the list of folders
if (position > parts.length) {
// If isset the callback then it will be invoked
if (callback)
callback();
// Exit and return a positive value
return true;
}
// Build the directory path
var directory = (dirpath.charAt(0) == '/' ? '/' : '') + parts.slice(0, position + 1).join('/');
// Check if directory exists
if (fs.existsSync(directory)) {
module.exports.mkdir(dirpath, mode, callback, position + 1);
} else {
if (fs.mkdirSync(directory, mode)) {
// If isset the callback then it will be invoked
if (callback)
callback(errors.renderError('mkdir', directory));
// Send the new exception
throw errors.renderError('mkdir', directory);
} else {
module.exports.mkdir(dirpath, mode, callback, position + 1);
}
}
}
/**
* Check if a value is present inside an array
*/
module.exports.in_array = function (value, array) {
// Scan all element
for (var i in array)
// Check if value exists
if (array[i] == value)
// Return the position of value
return i;
// The value not exists
return false;
}