chromecast/media/cdm/browser_cdm_cast.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_
   6 #define CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_
   7
   8 #include <stdint.h>
   9
  10 #include <map>
  11 #include <string>
  12
  13 #include "base/callback.h"
  14 #include "base/macros.h"
  15 #include "base/memory/ref_counted.h"
  16 #include "base/synchronization/lock.h"
  17 #include "media/base/browser_cdm.h"
  18 #include "media/cdm/json_web_key.h"
  19
  20 namespace chromecast {
  21 namespace media {
  22 class DecryptContext;
  23
  24 // BrowserCdmCast is an extension of BrowserCdm that provides common
  25 // functionality across CDM implementations.
  26 // All these additional functions are synchronous so:
  27 // - either both the CDM and the media pipeline must be running on the same
  28 //   thread,
  29 // - or BrowserCdmCast implementations must use some locks.
  30 //
  31 class BrowserCdmCast : public ::media::BrowserCdm {
  32  public:
  33   BrowserCdmCast();
  34   ~BrowserCdmCast() override;
  35
  36   void SetCallbacks(
  37       const ::media::SessionMessageCB& session_message_cb,
  38       const ::media::SessionClosedCB& session_closed_cb,
  39       const ::media::SessionErrorCB& session_error_cb,
  40       const ::media::SessionKeysChangeCB& session_keys_change_cb,
  41       const ::media::SessionExpirationUpdateCB& session_expiration_update_cb);
  42
  43   // PlayerTracker implementation.
  44   int RegisterPlayer(const base::Closure& new_key_cb,
  45                      const base::Closure& cdm_unset_cb) override;
  46   void UnregisterPlayer(int registration_id) override;
  47
  48   // ::media::BrowserCdm implementation:
  49   void LoadSession(::media::MediaKeys::SessionType session_type,
  50                    const std::string& session_id,
  51                    scoped_ptr<::media::NewSessionCdmPromise> promise) override;
  52   ::media::CdmContext* GetCdmContext() override;
  53
  54   // Returns the decryption context needed to decrypt frames encrypted with
  55   // |key_id|.
  56   // Returns null if |key_id| is not available.
  57   virtual scoped_refptr<DecryptContext> GetDecryptContext(
  58       const std::string& key_id) = 0;
  59
  60  protected:
  61   void OnSessionMessage(const std::string& session_id,
  62                         const std::vector<uint8>& message,
  63                         const GURL& destination_url);
  64   void OnSessionClosed(const std::string& session_id);
  65   void OnSessionKeysChange(const std::string& session_id,
  66                            const ::media::KeyIdAndKeyPairs& keys);
  67
  68  private:
  69   ::media::SessionMessageCB session_message_cb_;
  70   ::media::SessionClosedCB session_closed_cb_;
  71   ::media::SessionErrorCB session_error_cb_;
  72   ::media::SessionKeysChangeCB session_keys_change_cb_;
  73   ::media::SessionExpirationUpdateCB session_expiration_update_cb_;
  74
  75   base::Lock callback_lock_;
  76   uint32_t next_registration_id_;
  77   std::map<uint32_t, base::Closure> new_key_callbacks_;
  78   std::map<uint32_t, base::Closure> cdm_unset_callbacks_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(BrowserCdmCast);
  81 };
  82
  83 }  // namespace media
  84 }  // namespace chromecast
  85
  86 #endif  // CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_