videojs-contrib-media-sources/Gruntfile.js

A Media Source Extensions plugin for video.js

module.exports = function(grunt) {
  var pkg = grunt.file.readJSON('package.json');

  grunt.initConfig({
    // Metadata.
    pkg: pkg,
    banner: '/*! <%= pkg.name %> - v<%= pkg.version %> - ' +
      '<%= grunt.template.today("yyyy-mm-dd") %>\n' +
      '* Copyright (c) <%= grunt.template.today("yyyy") %> Brightcove;' +
      ' Licensed <%= _.pluck(pkg.licenses, "type").join(", ") %> */\n',
    // Task configuration.
    clean: {
      files: ['tmp', 'dist']
    },
    jshint: {
      files: ['Gruntfile.js', 'src/**/*.js', 'test/**/*.js']
    },
    karma: {
      test: {
        configFile: 'test/karma.conf.js'
      }
    },
    importscripts: {
      build: {
        src: 'src/transmuxer_worker.js',
        dest: 'tmp/transmuxer_worker.js'
      }
    },
    concat: {
      dist: {
        options: {
          banner: '<%= banner %>'
        },
        src: [
          'node_modules/mux.js/lib/utils/stream.js',
          'node_modules/mux.js/lib/utils/exp-golomb.js',
          'node_modules/mux.js/lib/codecs/aac.js',
          'node_modules/mux.js/lib/codecs/h264.js',
          'node_modules/mux.js/lib/m2ts/m2ts.js',
          'node_modules/mux.js/lib/flv/flv-tag.js',
          'node_modules/mux.js/lib/m2ts/metadata-stream.js',
          'node_modules/mux.js/lib/m2ts/caption-stream.js',
          'node_modules/mux.js/lib/flv/transmuxer.js',
          '<%= blobify.build.dest %>'
        ],
        dest: 'dist/videojs-media-sources.js'
      }
    },
    blobify: {
      build: {
        src: 'src/videojs-media-sources.js',
        dest: 'tmp/videojs-media-sources.js'
      }
    },
    uglify: {
      webworker: {
        src: '<%= importscripts.build.dest %>',
        dest: 'tmp/transmuxer_worker.min.js'
      },
      mediasource: {
        options: {
          banner: '<%= banner %>'
        },
        src: '<%=concat.dist.src%>',
        dest: 'dist/videojs-media-sources.min.js'
      }
    },
    connect: {
      server: {
        options: {
          keepalive: true
        }
      }
    },
    watch: {
      scripts: {
        files: [
          'src/**/*.js',
          'node_modules/mux.js/lib/**/*.js',
          'node_modules/mux.js/legacy/**/*.js'
        ],
        tasks: ['build'],
        options: {
          spawn: false,
        }
      }
    }
  });

  grunt.task.registerMultiTask(
    'importscripts',
    'Inline files references via importScripts in a WebWorker',
    function (arg1, arg2) {
      var fs = require('fs');
      var path = require('path');
      var falafel = require('falafel');

      this.files.forEach(function(f) {
        var src = f.src[0];
        // Warn on and remove invalid source files (if nonull was set).
        if (!grunt.file.exists(src)) {
          grunt.log.warn('Source file "' + filepath + '" not found.');
          return;
        }

        // Don't process directories
        if (grunt.file.isDir(src)) {
          return;
        }

        // Read file source.
        var srcContents = grunt.file.read(src);
        var currentPath = path.dirname(src);

        // Process the file looking for `importScripts` calls
        grunt.file.write(f.dest, falafel(srcContents, function (node) {
          // Check every function call for one that calls importScripts
          if (node.type === 'CallExpression' && node.callee.name === 'importScripts') {
            var fileName = node.arguments[0].value;
            var inlineSrc = grunt.file.read(path.resolve(currentPath, fileName));

            grunt.log.debug('Inlining importScripts file "' + path.resolve(currentPath, fileName) + '"...');

            // Replace the entire importScripts expression with the source of the file
            node.update(inlineSrc);
          }
        }).toString());
      });
    });

  grunt.task.registerMultiTask(
    'blobify',
    'Create a blob-based  WebWorker to inline a source file',
    function (arg1, arg2) {
      var fs = require('fs');
      var path = require('path');
      var falafel = require('falafel');

      this.files.forEach(function(f) {
        var src = f.src[0];
        // Warn on and remove invalid source files (if nonull was set).
        if (!grunt.file.exists(src)) {
          grunt.log.warn('Source file "' + filepath + '" not found.');
          return;
        }

        // Don't process directories
        if (grunt.file.isDir(src)) {
          return;
        }

        // Read file source.
        var srcContents = grunt.file.read(src);
        var currentPath = path.dirname(src);

        // Process the file looking for `importScripts` calls
        grunt.file.write(f.dest, falafel(srcContents, function (node) {
          // Check every function call for one that calls importScripts
          // and only imports the file we are looking for
          if (node.type === 'NewExpression' &&
            node.callee.name === 'Worker' &&
            node.arguments[0].right.value.indexOf('transmuxer_worker') > -1) {
            var inlineSrc = grunt.file.read(path.resolve(currentPath, '../tmp/transmuxer_worker.min.js'));

            // Replace the entire importScripts expression with the source of the file
            node.update('new Worker(URL.createObjectURL(new Blob([' + JSON.stringify(inlineSrc) + '], {type: "application/javascript"})))');
          }
        }).toString());
      });
    });

  grunt.loadNpmTasks('grunt-contrib-clean');
  grunt.loadNpmTasks('grunt-contrib-concat');
  grunt.loadNpmTasks('grunt-contrib-connect');
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-karma');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-watch');

  grunt.registerTask('default', ['test', 'build']);
  grunt.registerTask('test', ['jshint', 'karma']);
  grunt.registerTask('build', ['clean', 'importscripts', 'uglify:webworker', 'blobify', 'concat', 'uglify:mediasource']);
  grunt.registerTask('dev', ['jshint', 'build', 'watch']);
};