Extract requestMediaKeySystemAccess() algorithm.

media/blink/key_system_config_selector.h

+// Copyright 2015 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_BLINK_KEY_SYSTEM_CONFIG_SELECTOR_H_
+#define MEDIA_BLINK_KEY_SYSTEM_CONFIG_SELECTOR_H_
+
+#include <string>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/eme_constants.h"
+#include "third_party/WebKit/public/platform/WebVector.h"
+
+namespace blink {
+
+struct WebMediaKeySystemConfiguration;
+struct WebMediaKeySystemMediaCapability;
+class WebSecurityOrigin;
+class WebString;
+
+}  // namespace blink
+
+namespace media {
+
+class KeySystems;
+class MediaPermission;
+
+class KeySystemConfigSelector {
+ public:
+  KeySystemConfigSelector(const KeySystems* key_systems,
+                          MediaPermission* media_permission);
+
+  ~KeySystemConfigSelector();
+
+  void SelectConfig(
+      const blink::WebString& key_system,
+      const blink::WebVector<blink::WebMediaKeySystemConfiguration>&
+          candidate_configurations,
+      const blink::WebSecurityOrigin& security_origin,
+      base::Callback<void(const blink::WebMediaKeySystemConfiguration&)>
+          succeeded_cb,
+      base::Callback<void(const blink::WebString&)> not_supported_cb);
+
+ private:
+  struct SelectionRequest;
+  class ConfigState;
+
+  enum ConfigurationSupport {
+    CONFIGURATION_NOT_SUPPORTED,
+    CONFIGURATION_REQUIRES_PERMISSION,
+    CONFIGURATION_SUPPORTED,
+  };
+
+  void SelectConfigInternal(scoped_ptr<SelectionRequest> request);
+
+  void OnPermissionResult(scoped_ptr<SelectionRequest> request,
+                          bool is_permission_granted);
+
+  ConfigurationSupport GetSupportedConfiguration(
+      const std::string& key_system,
+      const blink::WebMediaKeySystemConfiguration& candidate,
+      ConfigState* config_state,
+      blink::WebMediaKeySystemConfiguration* accumulated_configuration);
+
+  bool GetSupportedCapabilities(
+      const std::string& key_system,
+      EmeMediaType media_type,
+      const blink::WebVector<blink::WebMediaKeySystemMediaCapability>&
+          requested_media_capabilities,
+      ConfigState* config_state,
+      std::vector<blink::WebMediaKeySystemMediaCapability>*
+          supported_media_capabilities);
+
+  bool IsSupportedContentType(const std::string& key_system,
+                              EmeMediaType media_type,
+                              const std::string& container_mime_type,
+                              const std::string& codecs);
+
+  const KeySystems* key_systems_;
+  MediaPermission* media_permission_;
+  base::WeakPtrFactory<KeySystemConfigSelector> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(KeySystemConfigSelector);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BLINK_KEY_SYSTEM_CONFIG_SELECTOR_H_