Index: chromecast/public/media/media_clock_device.h |
diff --git a/chromecast/public/media/media_clock_device.h b/chromecast/public/media/media_clock_device.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..ac5a2f68d25ad5ce7fe3e621ad47a3bc615f6943 |
--- /dev/null |
+++ b/chromecast/public/media/media_clock_device.h |
@@ -0,0 +1,63 @@ |
+// 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_PUBLIC_MEDIA_MEDIA_CLOCK_DEVICE_H_ |
+#define CHROMECAST_PUBLIC_MEDIA_MEDIA_CLOCK_DEVICE_H_ |
+ |
+#include <string> |
+ |
+namespace chromecast { |
+namespace media { |
+ |
+// Interface for platform-specific pipeline clock. |
+// Pipeline clocks follow this state machine: |
+// ------------------- |
+// | | |
+// v | |
+// kUninitialized --> kIdle --------- kRunning |
+// |
+// {any state} --> kError |
+// |
+// Notes: |
+// - Hardware resources should be acquired when transitioning from the |
+// |kUninitialized| state to the |kIdle| state. |
+// - The initial value of the timeline will only be set in the kIdle state. |
+class MediaClockDevice { |
+ public: |
+ enum State { |
+ kStateUninitialized, |
+ kStateIdle, |
+ kStateRunning, |
+ kStateError, |
+ }; |
+ |
+ virtual ~MediaClockDevice() {} |
+ |
+ // Returns the current state of the media clock. |
+ virtual State GetState() const = 0; |
+ |
+ // Changes the state and performs any necessary transitions. |
+ // Returns true when successful. |
+ virtual bool SetState(State new_state) = 0; |
+ |
+ // Sets the initial value of the timeline in microseconds. |
+ // Will only be invoked in state kStateIdle. |
+ // Returns true when successful. |
+ virtual bool ResetTimeline(int64_t time_microseconds) = 0; |
+ |
+ // Sets the clock rate. |
+ // |rate| == 0 means the clock is not progressing and that the renderer |
+ // tied to this media clock should pause rendering. |
+ // Will only be invoked in states kStateIdle or kStateRunning. |
+ virtual bool SetRate(float rate) = 0; |
+ |
+ // Retrieves the media clock time in microseconds. |
+ // Will only be invoked in states kStateIdle or kStateRunning. |
+ virtual int64_t GetTime() = 0; |
servolk
2015/07/30 17:50:29
Now that it returns just int64_t, let's rename it
halliwell
2015/07/30 18:20:18
Done.
|
+}; |
+ |
+} // namespace media |
+} // namespace chromecast |
+ |
+#endif // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_H_ |