media: Pass SetCdmReadyCB in {Audio|Video}Decoder::Initialize().

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"
 #include "base/memory/ref_counted.h"
 #include "media/base/audio_decoder_config.h"
+#include "media/base/cdm_context.h"
 #include "media/base/channel_layout.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/media_export.h"
 #include "media/base/pipeline_status.h"
 
 namespace media {
 
 class AudioBuffer;
 class DemuxerStream;
 
@@ skipping 26 matching lines @@
   // Note: Since this is a destructor, |this| will be destroyed after this call.
   // Make sure the callbacks fired from this call doesn't post any task that
   // 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.
+  //
+  // |set_cdm_ready_cb| can be used to set/cancel a CdmReadyCB with which the
+  // decoder can be notified when a CDM is ready. The decoder can use the CDM to
+  // handle encrypted video stream.
+  //
   //  |init_cb| is used to return initialization status.
   //  |output_cb| is called for decoded audio buffers (see Decode()).
   virtual void Initialize(const AudioDecoderConfig& config,
+                          const SetCdmReadyCB& set_cdm_ready_cb,
                           const InitCB& init_cb,
                           const OutputCB& output_cb) = 0;
 
   // 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_