author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 27 May 2010 12:49:31 +0300 | |
changeset 26 | dc7c549001d5 |
parent 23 | 98ccebc37403 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: This class is general player implementation of Player interface |
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* |
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*/ |
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|
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|
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package com.nokia.microedition.media; |
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|
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import javax.microedition.media.TimeBase; |
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import javax.microedition.media.MediaException; |
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import javax.microedition.media.Manager; |
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import com.nokia.mj.impl.utils.Logger; |
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/** |
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* This abstract player implementation must be derived. This class implements |
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* general player functionality such as state checking. |
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*/ |
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public abstract class PlayerBase implements InternalPlayer |
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{ |
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protected TimeBase iTimeBase; |
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|
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// state as defined in Player interface |
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// at first player is unrealized |
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protected int iState = UNREALIZED; |
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|
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/** |
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* Constructor |
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*/ |
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protected PlayerBase() |
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{ |
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} |
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|
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/** |
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* Every method has to check if player is closed with this method |
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*/ |
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protected void closeCheck() |
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{ |
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if (iState == CLOSED) |
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{ |
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throw new IllegalStateException("Player is CLOSED."); |
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} |
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} |
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|
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/** |
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* This method is from methods that are |
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* not allowed to be called, when player |
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* is in UNREALIZED state |
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*/ |
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protected void unrealizedCheck() |
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{ |
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if (getState() == UNREALIZED) |
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{ |
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throw new IllegalStateException("Player is UNREALIZED."); |
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} |
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} |
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|
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/** |
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* From Player |
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* @see Player |
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*/ |
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public TimeBase getTimeBase() |
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{ |
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closeCheck(); |
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unrealizedCheck(); |
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|
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// set default timebase |
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if (iTimeBase==null) |
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{ |
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iTimeBase = Manager.getSystemTimeBase(); |
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} |
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|
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return iTimeBase; |
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} |
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|
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/** |
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* From Player |
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* @see Player |
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*/ |
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public void setTimeBase(TimeBase aMaster) throws MediaException |
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{ |
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closeCheck(); |
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unrealizedCheck(); |
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|
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// A MediaException is thrown if |
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// setTimeBase is called on a STARTED Player. |
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if (getState() == STARTED) |
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{ |
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throw new IllegalStateException("Player is STARTED"); |
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} |
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|
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if (aMaster == null) |
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{ |
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105 |
// set default timebase |
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iTimeBase = Manager.getSystemTimeBase(); |
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107 |
} |
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108 |
else |
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109 |
{ |
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if (aMaster instanceof SystemTimeBase) |
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111 |
{ |
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iTimeBase = aMaster; |
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113 |
return; |
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114 |
} |
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115 |
else |
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116 |
{ |
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117 |
// default doesn't support any other TimeBases |
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throw new MediaException("Invalid timebase or timebase not supported"); |
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119 |
} |
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120 |
} |
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121 |
} |
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122 |
|
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123 |
/** |
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124 |
* From Player |
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125 |
* @see Player |
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126 |
*/ |
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127 |
public void realize() throws MediaException |
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128 |
{ |
26
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129 |
Logger.LOG(Logger.EJavaMMAPI, Logger.EInfo,"+ PlayerBase.realize() "); |
23
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130 |
closeCheck(); |
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131 |
int state = getState(); |
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132 |
Logger.LOG(Logger.EJavaMMAPI, Logger.EInfo,"+ PlayerBase.realize() after getstate() "); |
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133 |
|
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134 |
// If realize is called when the Player is in the |
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135 |
// REALIZED, PREFETCHTED or STARTED state, |
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136 |
// the request will be ignored. |
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137 |
if (state == UNREALIZED) |
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138 |
{ |
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139 |
doRealize(); |
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140 |
} |
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|
141 |
Logger.LOG(Logger.EJavaMMAPI, Logger.EInfo,"- PlayerBase.realize() "); |
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142 |
} |
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143 |
|
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144 |
/** |
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145 |
* Called from realize method. This method must be implemented in |
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146 |
* derived class. |
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147 |
* @see realize |
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148 |
*/ |
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149 |
abstract protected void doRealize() throws MediaException; |
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150 |
|
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151 |
/** |
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152 |
* From Player |
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153 |
* @see Player |
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154 |
*/ |
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155 |
public void prefetch() throws MediaException |
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156 |
{ |
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157 |
realize(); |
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|
158 |
|
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159 |
// prefetch must be ignored in other states |
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160 |
if (getState() == REALIZED) |
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161 |
{ |
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162 |
doPrefetch(); |
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163 |
} |
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164 |
} |
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165 |
|
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166 |
/** |
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167 |
* Called from prefetch method. |
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|
168 |
* @see prefetch |
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169 |
*/ |
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|
170 |
abstract protected void doPrefetch() throws MediaException; |
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|
171 |
|
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|
172 |
/** |
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173 |
* interface Player |
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|
174 |
* @see Player |
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175 |
*/ |
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|
176 |
public void deallocate() |
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|
177 |
{ |
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178 |
try |
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|
179 |
{ |
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180 |
stop(); |
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181 |
} |
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|
182 |
catch (MediaException me) |
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|
183 |
{ |
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|
184 |
// if stop fails we can do nothing |
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|
185 |
Logger.ELOG(Logger.EJavaMMAPI, |
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|
186 |
"MMA::PlayerBase: Stop failed in deallocate.", me); |
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|
187 |
} |
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|
188 |
if (getState() == PREFETCHED) |
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|
189 |
{ |
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|
190 |
doDeallocate(); |
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|
191 |
} |
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|
192 |
} |
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|
193 |
|
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|
194 |
/** |
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195 |
* Called from deallocate method. |
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196 |
*/ |
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|
197 |
abstract protected void doDeallocate(); |
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198 |
|
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|
199 |
/** |
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200 |
* interface Player |
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201 |
* @see Player |
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202 |
*/ |
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|
203 |
public void stop() throws MediaException |
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204 |
{ |
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205 |
closeCheck(); |
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|
206 |
if (getState() == STARTED) |
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207 |
{ |
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208 |
doStop(); |
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209 |
} |
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} |
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/** |
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* Called from realize method. |
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*/ |
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abstract protected void doStop() throws MediaException; |
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/** |
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* interface Player |
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* @see Player |
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*/ |
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public void close() |
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{ |
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/* |
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Releases all resources and cease all activity. |
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The close method indicates that the Player will no |
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longer be used and can shut itself down. |
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Methods invoked on a closed Player will throw RuntimeExceptions. |
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*/ |
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if (iState != CLOSED) |
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{ |
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deallocate(); |
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iState = CLOSED; |
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doClose(); |
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} |
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} |
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|
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/** |
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* Called from close method. |
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*/ |
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abstract protected void doClose(); |
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|
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/** |
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* interface Player. |
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* Derived classes may use this method to check parameter and state. |
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* @see Player |
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*/ |
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public void setLoopCount(int aCount) |
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{ |
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closeCheck(); |
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// -1 is valid count value meaning indefinitely looping |
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if ((aCount == 0) || |
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(aCount < -1)) |
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{ |
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throw new java.lang.IllegalArgumentException( |
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"Invalid loop count " + aCount + ", loop count cannot be 0 or < -1"); |
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} |
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if (getState() == STARTED) |
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{ |
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throw new IllegalStateException("Player is STARTED"); |
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} |
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} |
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|
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/** |
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* interface Player |
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* @see Player |
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*/ |
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public long setMediaTime(long aNow) throws MediaException |
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{ |
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closeCheck(); |
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unrealizedCheck(); |
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|
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long now = aNow; |
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|
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if (now < 0) |
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{ |
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// Setting the media time to negative values |
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// will effectively set the media time to zero. |
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now = 0; |
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} |
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return now; |
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} |
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} |
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|
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// End of File |