mirror of
https://github.com/musix-org/musix-oss
synced 2024-12-23 22:33:17 +00:00
251 lines
9.1 KiB
JavaScript
251 lines
9.1 KiB
JavaScript
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var when = require('when')
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, fs = require('fs');
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var errors = require('./errors')
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, utils = require('./utils')
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, configs = require('./configs')
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, video = require('./video');
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var ffmpeg = function (/* inputFilepath, settings, callback */) {
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/**
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* Retrieve the list of the codec supported by the ffmpeg software
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*/
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var _ffmpegInfoConfiguration = function (settings) {
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// New 'promise' instance
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var deferred = when.defer();
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// Instance the new arrays for the format
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var format = { modules : new Array(), encode : new Array(), decode : new Array() };
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// Make the call to retrieve information about the ffmpeg
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utils.exec(['ffmpeg','-formats','2>&1'], settings, function (error, stdout, stderr) {
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// Get the list of modules
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var configuration = /configuration:(.*)/.exec(stdout);
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// Check if exists the configuration
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if (configuration) {
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// Get the list of modules
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var modules = configuration[1].match(/--enable-([a-zA-Z0-9\-]+)/g);
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// Scan all modules
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for (var indexModule in modules) {
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// Add module to the list
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format.modules.push(/--enable-([a-zA-Z0-9\-]+)/.exec(modules[indexModule])[1]);
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}
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}
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// Get the codec list
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var codecList = stdout.match(/ (DE|D|E) (.*) {1,} (.*)/g);
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// Scan all codec
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for (var i in codecList) {
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// Get the match value
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var match = / (DE|D|E) (.*) {1,} (.*)/.exec(codecList[i]);
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// Check if match is valid
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if (match) {
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// Get the value from the match
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var scope = match[1].replace(/\s/g,'')
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, extension = match[2].replace(/\s/g,'');
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// Check which scope is best suited
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if (scope == 'D' || scope == 'DE')
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format.decode.push(extension);
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if (scope == 'E' || scope == 'DE')
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format.encode.push(extension);
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}
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}
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// Returns the list of supported formats
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deferred.resolve(format);
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});
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// Return 'promise' instance
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return deferred.promise;
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}
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/**
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* Get the video info
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*/
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var _videoInfo = function (fileInput, settings) {
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// New 'promise' instance
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var deferred = when.defer();
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// Make the call to retrieve information about the ffmpeg
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utils.exec(['ffmpeg','-i',fileInput,'2>&1'], settings, function (error, stdout, stderr) {
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// Perse output for retrieve the file info
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var filename = /from \'(.*)\'/.exec(stdout) || []
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, title = /(INAM|title)\s+:\s(.+)/.exec(stdout) || []
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, artist = /artist\s+:\s(.+)/.exec(stdout) || []
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, album = /album\s+:\s(.+)/.exec(stdout) || []
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, track = /track\s+:\s(.+)/.exec(stdout) || []
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, date = /date\s+:\s(.+)/.exec(stdout) || []
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, is_synched = (/start: 0.000000/.exec(stdout) !== null)
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, duration = /Duration: (([0-9]+):([0-9]{2}):([0-9]{2}).([0-9]+))/.exec(stdout) || []
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, container = /Input #0, ([a-zA-Z0-9]+),/.exec(stdout) || []
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, video_bitrate = /bitrate: ([0-9]+) kb\/s/.exec(stdout) || []
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, video_stream = /Stream #([0-9\.]+)([a-z0-9\(\)\[\]]*)[:] Video/.exec(stdout) || []
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, video_codec = /Video: ([\w]+)/.exec(stdout) || []
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, resolution = /(([0-9]{2,5})x([0-9]{2,5}))/.exec(stdout) || []
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, pixel = /[SP]AR ([0-9\:]+)/.exec(stdout) || []
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, aspect = /DAR ([0-9\:]+)/.exec(stdout) || []
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, fps = /([0-9\.]+) (fps|tb\(r\))/.exec(stdout) || []
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, audio_stream = /Stream #([0-9\.]+)([a-z0-9\(\)\[\]]*)[:] Audio/.exec(stdout) || []
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, audio_codec = /Audio: ([\w]+)/.exec(stdout) || []
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, sample_rate = /([0-9]+) Hz/i.exec(stdout) || []
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, channels = /Audio:.* (stereo|mono)/.exec(stdout) || []
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, audio_bitrate = /Audio:.* ([0-9]+) kb\/s/.exec(stdout) || []
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, rotate = /rotate[\s]+:[\s]([\d]{2,3})/.exec(stdout) || [];
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// Build return object
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var ret = {
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filename : filename[1] || ''
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, title : title[2] || ''
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, artist : artist[1] || ''
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, album : album[1] || ''
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, track : track[1] || ''
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, date : date[1] || ''
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, synched : is_synched
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, duration : {
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raw : duration[1] || ''
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, seconds : duration[1] ? utils.durationToSeconds(duration[1]) : 0
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}
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, video : {
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container : container[1] || ''
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, bitrate : (video_bitrate.length > 1) ? parseInt(video_bitrate[1], 10) : 0
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, stream : video_stream.length > 1 ? parseFloat(video_stream[1]) : 0.0
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, codec : video_codec[1] || ''
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, resolution : {
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w : resolution.length > 2 ? parseInt(resolution[2], 10) : 0
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, h : resolution.length > 3 ? parseInt(resolution[3], 10) : 0
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}
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, resolutionSquare : {}
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, aspect : {}
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, rotate : rotate.length > 1 ? parseInt(rotate[1], 10) : 0
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, fps : fps.length > 1 ? parseFloat(fps[1]) : 0.0
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}
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, audio : {
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codec : audio_codec[1] || ''
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, bitrate : audio_bitrate[1] || ''
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, sample_rate : sample_rate.length > 1 ? parseInt(sample_rate[1], 10) : 0
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, stream : audio_stream.length > 1 ? parseFloat(audio_stream[1]) : 0.0
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, channels : {
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raw : channels[1] || ''
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, value : (channels.length > 0) ? ({ stereo : 2, mono : 1 }[channels[1]] || 0) : ''
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}
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}
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};
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// Check if exist aspect ratio
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if (aspect.length > 0) {
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var aspectValue = aspect[1].split(":");
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ret.video.aspect.x = parseInt(aspectValue[0], 10);
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ret.video.aspect.y = parseInt(aspectValue[1], 10);
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ret.video.aspect.string = aspect[1];
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ret.video.aspect.value = parseFloat((ret.video.aspect.x / ret.video.aspect.y));
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} else {
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// If exists horizontal resolution then calculate aspect ratio
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if(ret.video.resolution.w > 0) {
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var gcdValue = utils.gcd(ret.video.resolution.w, ret.video.resolution.h);
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// Calculate aspect ratio
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ret.video.aspect.x = ret.video.resolution.w / gcdValue;
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ret.video.aspect.y = ret.video.resolution.h / gcdValue;
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ret.video.aspect.string = ret.video.aspect.x + ':' + ret.video.aspect.y;
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ret.video.aspect.value = parseFloat((ret.video.aspect.x / ret.video.aspect.y));
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}
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}
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// Save pixel ratio for output size calculation
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if (pixel.length > 0) {
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ret.video.pixelString = pixel[1];
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var pixelValue = pixel[1].split(":");
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ret.video.pixel = parseFloat((parseInt(pixelValue[0], 10) / parseInt(pixelValue[1], 10)));
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} else {
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if (ret.video.resolution.w !== 0) {
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ret.video.pixelString = '1:1';
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ret.video.pixel = 1;
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} else {
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ret.video.pixelString = '';
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ret.video.pixel = 0.0;
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}
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}
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// Correct video.resolution when pixel aspectratio is not 1
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if (ret.video.pixel !== 1 || ret.video.pixel !== 0) {
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if( ret.video.pixel > 1 ) {
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ret.video.resolutionSquare.w = parseInt(ret.video.resolution.w * ret.video.pixel, 10);
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ret.video.resolutionSquare.h = ret.video.resolution.h;
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} else {
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ret.video.resolutionSquare.w = ret.video.resolution.w;
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ret.video.resolutionSquare.h = parseInt(ret.video.resolution.h / ret.video.pixel, 10);
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}
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}
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// Returns the list of supported formats
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deferred.resolve(ret);
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});
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// Return 'promise' instance
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return deferred.promise;
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}
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/**
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* Get the info about ffmpeg's codec and about file
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*/
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var _getInformation = function (fileInput, settings) {
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var deferreds = [];
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// Add promise
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deferreds.push(_ffmpegInfoConfiguration(settings));
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deferreds.push(_videoInfo(fileInput, settings));
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// Return defer
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return when.all(deferreds);
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}
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var __constructor = function (args) {
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// Check if exist at least one option
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if (args.length == 0 || args[0] == undefined)
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throw errors.renderError('empty_input_filepath');
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// Check if first argument is a string
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if (typeof args[0] != 'string')
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throw errors.renderError('input_filepath_must_be_string');
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// Get the input filepath
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var inputFilepath = args[0];
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// Check if file exist
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if (!fs.existsSync(inputFilepath))
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throw errors.renderError('fileinput_not_exist');
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// New instance of the base configuration
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var settings = new configs();
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// Callback to call
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var callback = null;
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// Scan all arguments
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for (var i = 1; i < args.length; i++) {
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// Check the type of variable
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switch (typeof args[i]) {
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case 'object' :
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utils.mergeObject(settings, args[i]);
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break;
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case 'function' :
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callback = args[i];
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break;
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}
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}
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// Building the value for return value. Check if the callback is not a function. In this case will created a new instance of the deferred class
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var deferred = typeof callback != 'function' ? when.defer() : { promise : null };
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when(_getInformation(inputFilepath, settings), function (data) {
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// Check if the callback is a function
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if (typeof callback == 'function') {
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// Call the callback function e return the new instance of 'video' class
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callback(null, new video(inputFilepath, settings, data[0], data[1]));
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} else {
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// Positive response
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deferred.resolve(new video(inputFilepath, settings, data[0], data[1]));
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}
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}, function (error) {
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// Check if the callback is a function
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if (typeof callback == 'function') {
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// Call the callback function e return the error found
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callback(error, null);
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} else {
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// Negative response
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deferred.reject(error);
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}
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});
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// Return a possible promise instance
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return deferred.promise;
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}
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return __constructor.call(this, arguments);
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};
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module.exports = ffmpeg;
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