Decryptors can report kNoKey to WebMediaPlayer

media/base/audio_decoder.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_H_
 #define MEDIA_BASE_AUDIO_DECODER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 38 matching lines @@
   // depends on |this|.
   virtual ~AudioDecoder();
 
   // Returns the name of the decoder for logging purpose.
   virtual std::string GetDisplayName() const = 0;
 
   // Initializes an AudioDecoder with the given DemuxerStream, executing the
   // callback upon completion.
   //  |statistics_cb| is used to update global pipeline statistics.
   //  |output_cb| is called for decoded audio buffers (see Decode()).
-  virtual void Initialize(const AudioDecoderConfig& config,
-                          const PipelineStatusCB& status_cb,
-                          const OutputCB& output_cb) = 0;
+  //  |waiting_for_encryption_key_cb| is called whenever a new key needs to be

[ddorwin, 2015/02/19 05:33:17]

...whenever the key needed to decrypt the stream is not available.

[jrummell, 2015/02/23 22:06:31]

Done.

+  //                                  provided in order to decrypt the stream.
+  virtual void Initialize(
+      const AudioDecoderConfig& config,
+      const PipelineStatusCB& status_cb,
+      const OutputCB& output_cb,
+      const base::Closure& waiting_for_encryption_key_cb) = 0;

[ddorwin, 2015/02/19 05:33:17]

s/encryption/decryption/

[jrummell, 2015/02/23 22:06:31]

Done.

 
   // Requests samples to be decoded. Only one decode may be in flight at any
   // given time. Once the buffer is decoded the decoder calls |decode_cb|.
   // |output_cb| specified in Initialize() is called for each decoded buffer,
   // before or after |decode_cb|.
   //
   // Implementations guarantee that the callbacks will not be called from within
   // this method.
   //
   // If |buffer| is an EOS buffer then the decoder must be flushed, i.e.
   // |output_cb| must be called for each frame pending in the queue and
   // |decode_cb| must be called after that.
   virtual void Decode(const scoped_refptr<DecoderBuffer>& buffer,
                       const DecodeCB& decode_cb) = 0;
 
   // Resets decoder state. All pending Decode() requests will be finished or
   // aborted before |closure| is called.
   virtual void Reset(const base::Closure& closure) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_DECODER_H_