Update MediaKeys interface for EME

content/renderer/media/webcontentdecryptionmoduleresult_helper.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 CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULERESULT_HELPER_H_
+#define CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULERESULT_HELPER_H_
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/media_keys.h"
+#include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
+
+namespace content {
+
+// Keep track of a WebContentDecryptionModuleResults as they need to be kept
+// around until the corresponding operation completes.
+class WebContentDecryptionModuleResultHelper {
+ public:
+  WebContentDecryptionModuleResultHelper();
+  virtual ~WebContentDecryptionModuleResultHelper();
+
+  // Take a copy of |result| and keep it around until needed. Returns a
+  // SimpleCdmPromise that can be passed to the other methods to complete the
+  // WebContentDecryptionModuleResult. When SimpleCdmPromise is resolved,
+  // Complete() is called. If the SimpleCdmPromise is rejected,
+  // CompleteWithError() is called.
+  scoped_ptr<media::SimpleCdmPromise> CreateSimpleCdmPromise(
+      blink::WebContentDecryptionModuleResult result);
+
+  // Take a copy of |result| and keep it around until needed. Returns a
+  // KeyIdsPromise that can be passed to the other methods to complete the
+  // WebContentDecryptionModuleResult. When KeyIdsPromise is resolved,
+  // CompleteWithKeyIds() is called. If the KeyIdsPromise is rejected,
+  // CompleteWithError() is called.
+  scoped_ptr<media::KeyIdsPromise> CreateKeyIdsPromise(
+      blink::WebContentDecryptionModuleResult result);
+
+  // Take a copy of |result| and keep it around until needed. Returns an
+  // index that is passed to the Complete... methods to complete the
+  // WebContentDecryptionModuleResult.
+  uint32 AddResult(blink::WebContentDecryptionModuleResult result);
+
+  // Locate the corresponding WebContentDecryptionModuleResult for
+  // |result_index|, and call completeWithSession() on it.
+  // WebContentDecryptionModuleResult is destroyed afterwards. Does nothing if
+  // |result_index| does not map to a previously saved (and unused)
+  // WebContentDecryptionModuleResult object.
+  void CompleteWithSession(
+      uint32 result_index,
+      blink::WebContentDecryptionModuleResult::SessionStatus status);
+
+  // Locate the corresponding WebContentDecryptionModuleResult for
+  // |result_index|, and call completeWithError() on it.
+  // WebContentDecryptionModuleResult is destroyed afterwards. Does nothing if
+  // |result_index| does not map to a previously saved (and unused)
+  // WebContentDecryptionModuleResult object.
+  void CompleteWithError(uint32 result_index,
+                         media::MediaKeys::Exception exception_code,
+                         uint32 system_code,
+                         const std::string& error_message);
+
+ private:
+  typedef std::map<uint32, blink::WebContentDecryptionModuleResult> ResultMap;
+
+  // Locate the corresponding WebContentDecryptionModuleResult for
+  // |result_index|, and call complete() on it. WebContentDecryptionModuleResult
+  // is destroyed afterwards. Does nothing if |result_index| does not map to
+  // a previously saved (and unused) WebContentDecryptionModuleResult object.
+  void Complete(uint32 result_index);
+
+  // Locate the corresponding WebContentDecryptionModuleResult for
+  // |result_index|, and call completeWithKeyIds() on it.
+  // WebContentDecryptionModuleResult is destroyed afterwards. Does nothing if
+  // |result_index| does not map to a previously saved (and unused)
+  // WebContentDecryptionModuleResult object.
+  void CompleteWithKeyIds(uint32 result_index,
+                          const media::KeyIdsVector& key_ids);
+
+  // Keep track of all the outstanding WebContentDecryptionModuleResult objects.
+  uint32 next_available_result_index_;
+  ResultMap outstanding_results_;
+
+  // Since promises will live until they are fired, use a weak reference when
+  // creating a promise in case this class disappears before the promise
+  // actually fires.
+  base::WeakPtrFactory<WebContentDecryptionModuleResultHelper>
+      weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebContentDecryptionModuleResultHelper);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULERESULT_HELPER_H_