Load CMA backend from shared library

chromecast/media/cdm/browser_cdm_cast.h

 // Copyright 2014 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 CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_
 #define CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 10 matching lines @@
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
 class PlayerTrackerImpl;
 }
 
 namespace chromecast {
 namespace media {
-class DecryptContext;
+class DecryptContextImpl;
 
 // BrowserCdmCast is an extension of BrowserCdm that provides common
 // functionality across CDM implementations.
 // All these additional functions are synchronous so:
 // - either both the CDM and the media pipeline must be running on the same
 //   thread,
 // - or BrowserCdmCast implementations must use some locks.
 //
 class BrowserCdmCast : public ::media::BrowserCdm {
  public:
@@ skipping 11 matching lines @@
   int RegisterPlayer(const base::Closure& new_key_cb,
                      const base::Closure& cdm_unset_cb) override;
   void UnregisterPlayer(int registration_id) override;
 
   // ::media::BrowserCdm implementation:
   ::media::CdmContext* GetCdmContext() override;
 
   // Returns the decryption context needed to decrypt frames encrypted with
   // |key_id|.
   // Returns null if |key_id| is not available.
-  virtual scoped_refptr<DecryptContext> GetDecryptContext(
+  virtual scoped_ptr<DecryptContextImpl> GetDecryptContext(
       const std::string& key_id) const = 0;
 
  protected:
   void OnSessionMessage(const std::string& session_id,
                         const std::vector<uint8_t>& message,
                         const GURL& destination_url,
                         ::media::MediaKeys::MessageType message_type);
   void OnSessionClosed(const std::string& session_id);
   void OnSessionKeysChange(const std::string& session_id,
                            const ::media::KeyIdAndKeyPairs& keys);
@@ skipping 62 matching lines @@
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCdmCastUi);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_