Media: AudioVideoMetadataParser - Parse rotation metadata.

chrome/common/extensions/api/media_galleries.idl

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Use the <code>chrome.mediaGalleries</code> API to access media files (audio,
 // images, video) from the user's local disks (with the user's consent).
 namespace mediaGalleries {
 
   [inline_doc] enum GetMediaFileSystemsInteractivity {
     // Do not act interactively.
@@ skipping 88 matching lines @@
   dictionary MediaMetadata {
     // The browser sniffed mime type.
     DOMString mimeType;
 
     // Defined for images and video. In pixels.
     long? height;
     long? width;
 
     // Defined for audio and video. In seconds.
     double? duration;
+    
+    // Defined for images and video. In degrees counterclockwise.

[Lei Zhang, 2014/02/13 02:59:26]

Is this how it's usually done in the video world? seem un-intuitive to do
counterclock-wise

[tommycli, 2014/02/13 22:32:33]

Yeah I agree the comment is confusing. I changed it.

I defined it the same way as exiftool and ffmpeg does it - just looks like
someone rotated the video 90 degrees CCW.

+    long? rotation;
 
     // Generic metadata tags.
     DOMString? album;
     DOMString? artist;
     DOMString? comment;
     DOMString? copyright;
     long? disc;
     DOMString? genre;
     DOMString? language;
     DOMString? title;
@@ skipping 45 matching lines @@
                             optional MediaMetadataOptions options,
                             MediaMetadataCallback callback);
   };
 
   interface Events {
     // The pending media scan has changed state. See details for more
     // information.
     static void onScanProgress(ScanProgressDetails details);
   };
 };