[Chromecast] Upgrade to new CMA backend API

chromecast/media/cma/backend/media_clock_device_default.cc

-// Copyright 2015 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.
-
-#include "chromecast/media/cma/backend/media_clock_device_default.h"
-
-#include "media/base/timestamp_constants.h"
-
-namespace chromecast {
-namespace media {
-namespace {
-
-// Return true if transition from |state1| to |state2| is a valid state
-// transition.
-inline static bool IsValidStateTransition(MediaClockDevice::State state1,
-                                          MediaClockDevice::State state2) {
-  if (state2 == state1)
-    return true;
-
-  // All states can transition to |kStateError|.
-  if (state2 == MediaClockDevice::kStateError)
-    return true;
-
-  // All the other valid FSM transitions.
-  switch (state1) {
-    case MediaClockDevice::kStateUninitialized:
-      return state2 == MediaClockDevice::kStateIdle;
-    case MediaClockDevice::kStateIdle:
-      return state2 == MediaClockDevice::kStateRunning ||
-             state2 == MediaClockDevice::kStateUninitialized;
-    case MediaClockDevice::kStateRunning:
-      return state2 == MediaClockDevice::kStateIdle;
-    case MediaClockDevice::kStateError:
-      return state2 == MediaClockDevice::kStateUninitialized;
-    default:
-      return false;
-  }
-}
-
-}  // namespace
-
-MediaClockDeviceDefault::MediaClockDeviceDefault()
-    : state_(kStateUninitialized),
-      media_time_(::media::kNoTimestamp()),
-      rate_(0.0f) {
-  thread_checker_.DetachFromThread();
-}
-
-MediaClockDeviceDefault::~MediaClockDeviceDefault() {
-}
-
-MediaClockDevice::State MediaClockDeviceDefault::GetState() const {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  return state_;
-}
-
-bool MediaClockDeviceDefault::SetState(State new_state) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(IsValidStateTransition(state_, new_state));
-
-  if (new_state == state_)
-    return true;
-
-  state_ = new_state;
-
-  if (state_ == kStateRunning) {
-    stc_ = base::TimeTicks::Now();
-    DCHECK(media_time_ != ::media::kNoTimestamp());
-    return true;
-  }
-
-  if (state_ == kStateIdle) {
-    media_time_ = ::media::kNoTimestamp();
-    return true;
-  }
-
-  return true;
-}
-
-bool MediaClockDeviceDefault::ResetTimeline(int64_t time_microseconds) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK_EQ(state_, kStateIdle);
-  media_time_ = base::TimeDelta::FromMicroseconds(time_microseconds);
-  return true;
-}
-
-bool MediaClockDeviceDefault::SetRate(float rate) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  if (state_ == kStateRunning) {
-    base::TimeTicks now = base::TimeTicks::Now();
-    media_time_ = media_time_ + (now - stc_) * rate_;
-    stc_ = now;
-  }
-
-  rate_ = rate;
-  return true;
-}
-
-int64_t MediaClockDeviceDefault::GetTimeMicroseconds() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  if (state_ != kStateRunning)
-    return media_time_.InMicroseconds();
-
-  if (media_time_ == ::media::kNoTimestamp())
-    return media_time_.InMicroseconds();
-
-  base::TimeTicks now = base::TimeTicks::Now();
-  base::TimeDelta interpolated_media_time =
-      media_time_ + (now - stc_) * rate_;
-  return interpolated_media_time.InMicroseconds();
-}
-
-}  // namespace media
-}  // namespace chromecast