Index: media/base/time_source.h |
diff --git a/media/base/time_source.h b/media/base/time_source.h |
new file mode 100644 |
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+++ b/media/base/time_source.h |
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+// 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 MEDIA_BASE_TIME_SOURCE_H_ |
+#define MEDIA_BASE_TIME_SOURCE_H_ |
+ |
+#include "base/time/time.h" |
+#include "media/base/media_export.h" |
+ |
+namespace media { |
+ |
+// A TimeSource is capable of providing the current media time. |
+class MEDIA_EXPORT TimeSource { |
+ public: |
+ TimeSource() {} |
+ virtual ~TimeSource() {} |
+ |
+ // Signal the time source to start ticking. It is expected that values from |
+ // CurrentMediaTime() will start increasing. |
+ virtual void StartTicking() = 0; |
+ |
+ // Signal the time source to stop ticking. It is expected that values from |
+ // CurrentMediaTime() will remain constant. |
+ virtual void StopTicking() = 0; |
+ |
+ // Updates the current playback rate. It is expected that values from |
+ // CurrentMediaTime() will eventually reflect the new playback rate (e.g., the |
+ // media time will advance at half speed if the rate was set to 0.5f). |
+ virtual void SetPlaybackRate(float playback_rate) = 0; |
+ |
+ // Sets the media time to start ticking from. Only valid to call while the |
+ // time source is not ticking. |
+ virtual void SetMediaTime(base::TimeDelta time) = 0; |
+ |
+ // Returns the current media time. |
+ virtual base::TimeDelta CurrentMediaTime() = 0; |
+}; |
+ |
+} // namespace media |
+ |
+#endif // MEDIA_BASE_TIME_SOURCE_H_ |