Support encrypted audio stream in demuxer.

media/webm/webm_stream_parser.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_WEBM_WEBM_STREAM_PARSER_H_
 #define MEDIA_WEBM_WEBM_STREAM_PARSER_H_
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/audio_decoder_config.h"
@@ skipping 42 matching lines @@
 
   // Incrementally parses WebM cluster elements. This method also skips
   // CUES elements if they are encountered since we currently don't use the
   // data in these elements.
   //
   // Returns < 0 if the parse fails.
   // Returns 0 if more data is needed.
   // Returning > 0 indicates success & the number of bytes parsed.
   int ParseCluster(const uint8* data, int size);
 
+  // Fire needkey event through the |need_key_cb_|.
+  void FireNeedKey(const std::string& key_id);
+
   State state_;
   InitCB init_cb_;
   NewConfigCB config_cb_;
   NewBuffersCB audio_cb_;
   NewBuffersCB video_cb_;
   NeedKeyCB need_key_cb_;
   NewMediaSegmentCB new_segment_cb_;
   base::Closure end_of_segment_cb_;
 
   // True if a new cluster id has been seen, but no audio or video buffers have
   // been parsed yet.
   bool waiting_for_buffers_;
 
   scoped_ptr<WebMClusterParser> cluster_parser_;
   ByteQueue byte_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMStreamParser);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_WEBM_WEBM_STREAM_PARSER_H_