chromecast/media/cma/backend/media_component_device.cc

   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_component_device.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace chromecast {
  10 namespace media {
  11
  12 MediaComponentDevice::Client::Client() {
  13 }
  14
  15 MediaComponentDevice::Client::~Client() {
  16 }
  17
  18 MediaComponentDevice::MediaComponentDevice() {
  19 }
  20
  21 MediaComponentDevice::~MediaComponentDevice() {
  22 }
  23
  24 // static
  25 bool MediaComponentDevice::IsValidStateTransition(State state1, State state2) {
  26   if (state2 == state1)
  27     return true;
  28
  29   // All states can transition to |kStateError|.
  30   bool is_transition_valid = (state2 == kStateError);
  31
  32   // All the other valid FSM transitions.
  33   is_transition_valid = is_transition_valid ||
  34       (state1 == kStateUninitialized && (state2 == kStateIdle)) ||
  35       (state1 == kStateIdle && (state2 == kStateRunning ||
  36                                 state2 == kStatePaused ||
  37                                 state2 == kStateUninitialized)) ||
  38       (state1 == kStatePaused && (state2 == kStateIdle ||
  39                                   state2 == kStateRunning)) ||
  40       (state1 == kStateRunning && (state2 == kStateIdle ||
  41                                    state2 == kStatePaused)) ||
  42       (state1 == kStateError && (state2 == kStateUninitialized));
  43
  44   return is_transition_valid;
  45 }
  46
  47 // static
  48 std::string MediaComponentDevice::StateToString(const State& state) {
  49   switch (state) {
  50     case kStateUninitialized:
  51       return "Uninitialized";
  52     case kStateIdle:
  53       return "Idle";
  54     case kStateRunning:
  55       return "Running";
  56     case kStatePaused:
  57       return "Paused";
  58     case kStateError:
  59       return "Error";
  60     default:
  61       NOTREACHED() << "Unknown MediaComponentDevice::State: " << state;
  62       return "";
  63   }
  64 }
  65
  66 }  // namespace media
  67 }  // namespace chromecast