media: Support better decoder switching

media/base/audio_decoder_config.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_BASE_AUDIO_DECODER_CONFIG_H_
 #define MEDIA_BASE_AUDIO_DECODER_CONFIG_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 70 matching lines @@
   // Note that in a potentially encrypted audio stream, individual buffers
   // can be encrypted or not encrypted.
   bool is_encrypted() const { return encryption_scheme_.is_encrypted(); }
 
   // Encryption scheme used for encrypted buffers.
   const EncryptionScheme& encryption_scheme() const {
     return encryption_scheme_;
   }
 
   // Sets the config to be encrypted or not encrypted manually. This can be
-  // useful for decryptors that decrypts an encrypted stream to a clear stream,
-  // or for decoder selectors that wants to select decrypting decoders instead
-  // of clear decoders.
+  // useful for decryptors that decrypts an encrypted stream to a clear stream.

[watk, 2017/05/04 21:35:32]

If you want to fix this while you're at it :) s/decrypts/decrypt

   void SetIsEncrypted(bool is_encrypted);
 
  private:
   AudioCodec codec_;
   SampleFormat sample_format_;
   int bytes_per_channel_;
   ChannelLayout channel_layout_;
   int samples_per_second_;
   int bytes_per_frame_;
   std::vector<uint8_t> extra_data_;
   EncryptionScheme encryption_scheme_;
 
   // |seek_preroll_| is the duration of the data that the decoder must decode
   // before the decoded data is valid.
   base::TimeDelta seek_preroll_;
 
   // |codec_delay_| is the number of frames the decoder should discard before
   // returning decoded data.  This value can include both decoder delay as well
   // as padding added during encoding.
   int codec_delay_;
 
   // Not using DISALLOW_COPY_AND_ASSIGN here intentionally to allow the compiler
   // generated copy constructor and assignment operator. Since the extra data is
   // typically small, the performance impact is minimal.
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_DECODER_CONFIG_H_