Add AAC codec specific data for MSE on android

media/mp4/aac.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_AAC_H_
 #define MEDIA_MP4_AAC_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 34 matching lines @@
   // Returns the channel_layout value that should used in an
   // AudioDecoderConfig.
   ChannelLayout GetChannelLayout(bool sbr_in_mimetype) const;
 
   // This function converts a raw AAC frame into an AAC frame with an ADTS
   // header. On success, the function returns true and stores the converted data
   // in the buffer. The function returns false on failure and leaves the buffer
   // unchanged.
   bool ConvertEsdsToADTS(std::vector<uint8>* buffer) const;
 
+#if defined(OS_ANDROID)
+  // Returns the codec specific data needed by android MediaCodec.
+  // The codec specific data contains 2 bytes in the format of:
+  // oooo offf fccc c000
+  // o - audioObjectType
+  // f - samplingFreqIndex
+  // c - channelConfig
+  std::vector<uint8> GetCodecSpecificData() const;
+#endif
+
   // Size in bytes of the ADTS header added by ConvertEsdsToADTS().
   static const size_t kADTSHeaderSize = 7;
 
  private:
   bool SkipDecoderGASpecificConfig(BitReader* bit_reader) const;
   bool SkipErrorSpecificConfig() const;
   bool SkipGASpecificConfig(BitReader* bit_reader) const;
 
   // The following variables store the AAC specific configuration information
   // that are used to generate the ADTS header.
   uint8 profile_;
   uint8 frequency_index_;
   uint8 channel_config_;
 
   // The following variables store audio configuration information that
   // can be used by Chromium. They are based on the AAC specific
   // configuration but can be overridden by extensions in elementary
   // stream descriptor.
   int frequency_;
   int extension_frequency_;
   ChannelLayout channel_layout_;
 };
 
 }  // namespace mp4
 
 }  // namespace media
 
 #endif  // MEDIA_MP4_AAC_H_