fix: Fix normalized codec for VP9 (#7645)

Author: avelad

lib/util/mime_utils.js

@@ -166,6 +166,8 @@ shaka.util.MimeUtils = class {
         return 'dtsx'; // DTS:X
       case base === 'mp4a' && profile === 'a9':
         return 'dtsc'; // DTS Digital Surround
+      case base === 'vp09':
+        return 'vp9';
       case base === 'avc1':
       case base === 'avc3':
         return 'avc'; // H264

test/util/mime_utils_unit.js

@@ -42,6 +42,9 @@ describe('MimeUtils', () => {
     expect(getNormalizedCodec('vp8')).toBe('vp8');
     expect(getNormalizedCodec('vp8.0')).toBe('vp8');
 
+    expect(getNormalizedCodec('vp9')).toBe('vp9');
+    expect(getNormalizedCodec('vp09')).toBe('vp9');
+
     expect(getNormalizedCodec('avc1')).toBe('avc');
     expect(getNormalizedCodec('avc3')).toBe('avc');