Support EAC3 (Dolby Digital Plus) codec

media/mp4/es_descriptor.h

 // 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.
 
 #ifndef MEDIA_MP4_ES_DESCRIPTOR_H_
 #define MEDIA_MP4_ES_DESCRIPTOR_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 class BitReader;
 
 namespace mp4 {
 
 // The following values are extracted from ISO 14496 Part 1 Table 5 -
 // objectTypeIndication Values. Only values currently in use are included.
 enum ObjectType {
   kForbidden = 0,
   kISO_14496_3 = 0x40,  // MPEG4 AAC
-  kISO_13818_7_AAC_LC = 0x67  // MPEG2 AAC-LC
+  kISO_13818_7_AAC_LC = 0x67,  // MPEG2 AAC-LC
+  kEAC3 = 0xa6  // Dolby Digital Plus
 };
 
 // This class parse object type and decoder specific information from an
 // elementary stream descriptor, which is usually contained in an esds box.
 // Please refer to ISO 14496 Part 1 7.2.6.5 for more details.
 class MEDIA_EXPORT ESDescriptor {
  public:
+  // Utility function to check if the given object type is AAC.
+  static bool IsAAC(uint8 object_type);
+
   ESDescriptor();
   ~ESDescriptor();
 
   bool Parse(const std::vector<uint8>& data);
 
   uint8 object_type() const;
   const std::vector<uint8>& decoder_specific_info() const;
 
  private:
   enum Tag {
     kESDescrTag = 0x03,
     kDecoderConfigDescrTag = 0x04,
     kDecoderSpecificInfoTag = 0x05
   };
 
   bool ParseDecoderConfigDescriptor(BitReader* reader);
   bool ParseDecoderSpecificInfo(BitReader* reader);
 
   uint8 object_type_;
   std::vector<uint8> decoder_specific_info_;
 };
 
 }  // namespace mp4
 
 }  // namespace media
 
 #endif  // MEDIA_MP4_ES_DESCRIPTOR_H_