media: Add MediaDrmBridgeCdmContext.

media/base/android/media_drm_bridge_cdm_context.h

+// Copyright 2016 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_ANDROID_MEDIA_DRM_BRIDGE_CDM_CONTEXT_H_
+#define MEDIA_BASE_ANDROID_MEDIA_DRM_BRIDGE_CDM_CONTEXT_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/callback.h"
+#include "base/macros.h"
+#include "media/base/cdm_context.h"
+#include "media/base/media_export.h"
+#include "media/base/player_tracker.h"
+
+namespace media {
+
+class MediaDrmBridge;
+
+// The CdmContext implementation for MediaDrmBridge. MediaDrmBridge supports
+// neither Decryptor nor CDM ID, but uses MediaCrypto to connect to MediaCodec.
+// MediaCodec based decoders should cast the given CdmContext to this class to

[ddorwin, 2016/03/22 17:20:12]

nit '-' before "based"

[xhwang, 2016/03/22 17:35:10]

Done.

+// access APIs defined in this class.
+//
+// Methods can be called on any thread. The registered callbacks will be fired
+// on the thread |media_drm_bridge_| is running on. The caller should make sure
+// that the callbacks are posted to the correct thread.
+//
+// TODO(xhwang): Remove PlayerTracker interface.
+class MEDIA_EXPORT MediaDrmBridgeCdmContext : public CdmContext,
+                                              public PlayerTracker {
+ public:
+  using JavaObjectPtr = scoped_ptr<base::android::ScopedJavaGlobalRef<jobject>>;
+
+  // Notification called when MediaCrypto object is ready.
+  // Parameters:
+  // |media_crypto| - reference to MediaCrypto object
+  // |needs_protected_surface| - true if protected surface is required
+  using MediaCryptoReadyCB = base::Callback<void(JavaObjectPtr media_crypto,
+                                                 bool needs_protected_surface)>;
+
+  // The |media_drm_bridge| owns |this| and is guaranteed to outlive |this|.
+  explicit MediaDrmBridgeCdmContext(MediaDrmBridge* media_drm_bridge);
+
+  ~MediaDrmBridgeCdmContext() final;
+
+  // CdmContext implementation.
+  Decryptor* GetDecryptor() final;
+  int GetCdmId() const final;
+
+  // PlayerTracker implementation.
+  // Methods can be called on any thread. The registered callbacks will be fired
+  // on |task_runner_|. The caller should make sure that the callbacks are
+  // posted to the correct thread.
+  //
+  // Note: RegisterPlayer() must be called before SetMediaCryptoReadyCB() to
+  // avoid missing any new key notifications.
+  int RegisterPlayer(const base::Closure& new_key_cb,
+                     const base::Closure& cdm_unset_cb) final;
+  void UnregisterPlayer(int registration_id) final;
+
+  void SetMediaCryptoReadyCB(const MediaCryptoReadyCB& media_crypto_ready_cb);
+
+ private:
+  MediaDrmBridge* const media_drm_bridge_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaDrmBridgeCdmContext);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_ANDROID_MEDIA_DRM_BRIDGE_CDM_CONTEXT_H_