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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "chromecast/media/cma/backend/media_clock_device.h" | |
6 | |
7 #include "base/logging.h" | |
8 | |
9 namespace chromecast { | |
10 namespace media { | |
11 | |
12 MediaClockDevice::MediaClockDevice() { | |
13 } | |
14 | |
15 MediaClockDevice::~MediaClockDevice() { | |
16 } | |
17 | |
18 // static | |
19 bool MediaClockDevice::IsValidStateTransition(State state1, State state2) { | |
20 if (state2 == state1) | |
21 return true; | |
22 | |
23 // All states can transition to |kStateError|. | |
24 bool is_transition_valid = (state2 == kStateError); | |
25 | |
26 // All the other valid FSM transitions. | |
27 is_transition_valid = is_transition_valid || | |
28 (state1 == kStateUninitialized && (state2 == kStateIdle)) || | |
29 (state1 == kStateIdle && (state2 == kStateRunning || | |
30 state2 == kStateUninitialized)) || | |
31 (state1 == kStateRunning && (state2 == kStateIdle)) || | |
32 (state1 == kStateError && (state2 == kStateUninitialized)); | |
33 | |
34 return is_transition_valid; | |
35 } | |
36 | |
37 // static | |
38 std::string MediaClockDevice::StateToString(const State& state) { | |
39 switch (state) { | |
40 case kStateUninitialized: | |
41 return "Uninitialized"; | |
42 case kStateIdle: | |
43 return "Idle"; | |
44 case kStateRunning: | |
45 return "Running"; | |
46 case kStateError: | |
47 return "Error"; | |
48 default: | |
49 NOTREACHED() << "Unknown MediaClockDevice::State: " << state; | |
50 return ""; | |
51 } | |
52 } | |
53 | |
54 } // namespace media | |
55 } // namespace chromecast | |
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