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gaia/apps/camera/js/lib/dcf.js

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+define(function(require, exports, module) {
+'use strict';
+
+// This handles the logic pertaining to the naming of files according
+// to the Design rule for Camera File System
+// * http://en.wikipedia.org/wiki/Design_rule_for_Camera_File_system
+
+/**
+ * Dependencies
+ */
+
+var asyncStorage = require('asyncStorage');
+var debug = require('debug')('dcf');
+var format = require('format');
+
+/**
+ * Locals
+ */
+
+var dcfConfigLoaded = false;
+var deferredArgs = null;
+var defaultSeq = {file: 1, dir: 100};
+var dcfConfig = {
+  key: 'dcf_key',
+  seq: null,
+  postFix: 'MZLLA',
+  prefix: {video: 'VID_', image: 'IMG_'},
+  ext: {video: '3gp', image: 'jpg'}
+};
+
+exports.init = function() {
+  debug('initializing');
+  exports.checkFileCounter(function() {
+    // We have a previous call to createDCFFilename that is waiting for
+    // a response, fire it again
+    if (deferredArgs) {
+      var args = deferredArgs;
+      exports.createDCFFilename(args.storage, args.type, args.callback);
+      deferredArgs = null;
+    }
+
+    debug('initialized');
+  });
+};
+
+exports.checkFileCounter = function(callback) {
+  asyncStorage.getItem(dcfConfig.key, function(value) {
+    dcfConfigLoaded = true;
+    dcfConfig.seq = value ? value : defaultSeq;
+
+    if (callback) {
+      callback();
+    }
+  });
+};
+
+exports.createDCFFilename = function(storage, type, callback) {
+
+  // We havent loaded the current counters from indexedDB yet, defer
+  // the call
+  if (!dcfConfigLoaded) {
+    deferredArgs = {storage: storage, type: type, callback: callback};
+    return;
+  }
+
+  var dir = 'DCIM/' + dcfConfig.seq.dir + dcfConfig.postFix + '/';
+  var filename = dcfConfig.prefix[type] +
+    format.padLeft(dcfConfig.seq.file, 4, '0') + '.' +
+    dcfConfig.ext[type];
+  var filepath = dir + filename;
+
+  // A file with this name may have been written by the user or
+  // our indexeddb sequence tracker was cleared, check we wont overwrite
+  // anything
+  var req = storage.get(filepath);
+
+  // A file existed, we bump the directory then try to generate a
+  // new filename
+  req.onsuccess = function() {
+    dcfConfig.seq.file = 1;
+    dcfConfig.seq.dir += 1;
+    asyncStorage.setItem(dcfConfig.key, dcfConfig.seq, function() {
+      exports.createDCFFilename(storage, type, callback);
+    });
+  };
+
+  // No file existed, we are good to go
+  req.onerror = function() {
+    if (dcfConfig.seq.file < 9999) {
+      dcfConfig.seq.file += 1;
+    } else {
+      dcfConfig.seq.file = 1;
+      dcfConfig.seq.dir += 1;
+    }
+    asyncStorage.setItem(dcfConfig.key, dcfConfig.seq, function() {
+      callback(filepath, filename, dir);
+    });
+  };
+};
+
+});