Chromecast: extensions to the BrowserCdm interface.

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>
+#include <string>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "media/base/browser_cdm.h"
+
+namespace chromecast {
+namespace media {
+class DecryptContext;
+
+// 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:
+  BrowserCdmCast();
+  virtual ~BrowserCdmCast() override;
+
+  // PlayerTracker implementation.
+  int RegisterPlayer(const base::Closure& new_key_cb,
+                     const base::Closure& cdm_unset_cb) override;
+  void UnregisterPlayer(int registration_id) 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(
+      const std::string& key_id) const = 0;
+
+ protected:
+  // Notifies all listeners a new key was added on the next message loop cycle.
+  void NotifyKeyAdded() const;
+
+ private:
+  uint32_t next_registration_id_;
+  std::map<uint32_t, base::Closure> new_key_callbacks_;
+  std::map<uint32_t, base::Closure> cdm_unset_callbacks_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserCdmCast);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CDM_BROWSER_CDM_CAST_H_