MediaPlayer.java revision cf4550c3198d6b3d92cdc52707fe70d7cc0caa9f
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.media; 18 19import android.content.ContentResolver; 20import android.content.Context; 21import android.content.res.AssetFileDescriptor; 22import android.net.Uri; 23import android.os.Handler; 24import android.os.Looper; 25import android.os.Message; 26import android.os.ParcelFileDescriptor; 27import android.os.PowerManager; 28import android.util.Log; 29import android.view.Surface; 30import android.view.SurfaceHolder; 31import android.graphics.Bitmap; 32import android.media.AudioManager; 33 34import java.io.FileDescriptor; 35import java.io.IOException; 36 37import java.lang.ref.WeakReference; 38 39/** 40 * MediaPlayer class can be used to control playback 41 * of audio/video files and streams. An example on how to use the methods in 42 * this class can be found in {@link android.widget.VideoView}. 43 * Please see <a href="{@docRoot}guide/topics/media/index.html">Audio and Video</a> 44 * for additional help using MediaPlayer. 45 * 46 * <p>Topics covered here are: 47 * <ol> 48 * <li><a href="#StateDiagram">State Diagram</a> 49 * <li><a href="#Valid_and_Invalid_States">Valid and Invalid States</a> 50 * <li><a href="#Permissions">Permissions</a> 51 * </ol> 52 * 53 * <a name="StateDiagram"></a> 54 * <h3>State Diagram</h3> 55 * 56 * <p>Playback control of audio/video files and streams is managed as a state 57 * machine. The following diagram shows the life cycle and the states of a 58 * MediaPlayer object driven by the supported playback control operations. 59 * The ovals represent the states a MediaPlayer object may reside 60 * in. The arcs represent the playback control operations that drive the object 61 * state transition. There are two types of arcs. The arcs with a single arrow 62 * head represent synchronous method calls, while those with 63 * a double arrow head represent asynchronous method calls.</p> 64 * 65 * <p><img src="../../../images/mediaplayer_state_diagram.gif" 66 * alt="MediaPlayer State diagram" 67 * border="0" /></p> 68 * 69 * <p>From this state diagram, one can see that a MediaPlayer object has the 70 * following states:</p> 71 * <ul> 72 * <li>When a MediaPlayer object is just created using <code>new</code> or 73 * after {@link #reset()} is called, it is in the <em>Idle</em> state; and after 74 * {@link #release()} is called, it is in the <em>End</em> state. Between these 75 * two states is the life cycle of the MediaPlayer object. 76 * <ul> 77 * <li>There is a subtle but important difference between a newly constructed 78 * MediaPlayer object and the MediaPlayer object after {@link #reset()} 79 * is called. It is a programming error to invoke methods such 80 * as {@link #getCurrentPosition()}, 81 * {@link #getDuration()}, {@link #getVideoHeight()}, 82 * {@link #getVideoWidth()}, {@link #setAudioStreamType(int)}, 83 * {@link #setLooping(boolean)}, 84 * {@link #setVolume(float, float)}, {@link #pause()}, {@link #start()}, 85 * {@link #stop()}, {@link #seekTo(int)}, {@link #prepare()} or 86 * {@link #prepareAsync()} in the <em>Idle</em> state for both cases. If any of these 87 * methods is called right after a MediaPlayer object is constructed, 88 * the user supplied callback method OnErrorListener.onError() won't be 89 * called by the internal player engine and the object state remains 90 * unchanged; but if these methods are called right after {@link #reset()}, 91 * the user supplied callback method OnErrorListener.onError() will be 92 * invoked by the internal player engine and the object will be 93 * transfered to the <em>Error</em> state. </li> 94 * <li>It is also recommended that once 95 * a MediaPlayer object is no longer being used, call {@link #release()} immediately 96 * so that resources used by the internal player engine associated with the 97 * MediaPlayer object can be released immediately. Resource may include 98 * singleton resources such as hardware acceleration components and 99 * failure to call {@link #release()} may cause subsequent instances of 100 * MediaPlayer objects to fallback to software implementations or fail 101 * altogether. Once the MediaPlayer 102 * object is in the <em>End</em> state, it can no longer be used and 103 * there is no way to bring it back to any other state. </li> 104 * <li>Furthermore, 105 * the MediaPlayer objects created using <code>new</code> is in the 106 * <em>Idle</em> state, while those created with one 107 * of the overloaded convenient <code>create</code> methods are <em>NOT</em> 108 * in the <em>Idle</em> state. In fact, the objects are in the <em>Prepared</em> 109 * state if the creation using <code>create</code> method is successful. 110 * </li> 111 * </ul> 112 * </li> 113 * <li>In general, some playback control operation may fail due to various 114 * reasons, such as unsupported audio/video format, poorly interleaved 115 * audio/video, resolution too high, streaming timeout, and the like. 116 * Thus, error reporting and recovery is an important concern under 117 * these circumstances. Sometimes, due to programming errors, invoking a playback 118 * control operation in an invalid state may also occur. Under all these 119 * error conditions, the internal player engine invokes a user supplied 120 * OnErrorListener.onError() method if an OnErrorListener has been 121 * registered beforehand via 122 * {@link #setOnErrorListener(android.media.MediaPlayer.OnErrorListener)}. 123 * <ul> 124 * <li>It is important to note that once an error occurs, the 125 * MediaPlayer object enters the <em>Error</em> state (except as noted 126 * above), even if an error listener has not been registered by the application.</li> 127 * <li>In order to reuse a MediaPlayer object that is in the <em> 128 * Error</em> state and recover from the error, 129 * {@link #reset()} can be called to restore the object to its <em>Idle</em> 130 * state.</li> 131 * <li>It is good programming practice to have your application 132 * register a OnErrorListener to look out for error notifications from 133 * the internal player engine.</li> 134 * <li>IlleglStateException is 135 * thrown to prevent programming errors such as calling {@link #prepare()}, 136 * {@link #prepareAsync()}, or one of the overloaded <code>setDataSource 137 * </code> methods in an invalid state. </li> 138 * </ul> 139 * </li> 140 * <li>Calling 141 * {@link #setDataSource(FileDescriptor)}, or 142 * {@link #setDataSource(String)}, or 143 * {@link #setDataSource(Context, Uri)}, or 144 * {@link #setDataSource(FileDescriptor, long, long)} transfers a 145 * MediaPlayer object in the <em>Idle</em> state to the 146 * <em>Initialized</em> state. 147 * <ul> 148 * <li>An IllegalStateException is thrown if 149 * setDataSource() is called in any other state.</li> 150 * <li>It is good programming 151 * practice to always look out for <code>IllegalArgumentException</code> 152 * and <code>IOException</code> that may be thrown from the overloaded 153 * <code>setDataSource</code> methods.</li> 154 * </ul> 155 * </li> 156 * <li>A MediaPlayer object must first enter the <em>Prepared</em> state 157 * before playback can be started. 158 * <ul> 159 * <li>There are two ways (synchronous vs. 160 * asynchronous) that the <em>Prepared</em> state can be reached: 161 * either a call to {@link #prepare()} (synchronous) which 162 * transfers the object to the <em>Prepared</em> state once the method call 163 * returns, or a call to {@link #prepareAsync()} (asynchronous) which 164 * first transfers the object to the <em>Preparing</em> state after the 165 * call returns (which occurs almost right way) while the internal 166 * player engine continues working on the rest of preparation work 167 * until the preparation work completes. When the preparation completes or when {@link #prepare()} call returns, 168 * the internal player engine then calls a user supplied callback method, 169 * onPrepared() of the OnPreparedListener interface, if an 170 * OnPreparedListener is registered beforehand via {@link 171 * #setOnPreparedListener(android.media.MediaPlayer.OnPreparedListener)}.</li> 172 * <li>It is important to note that 173 * the <em>Preparing</em> state is a transient state, and the behavior 174 * of calling any method with side effect while a MediaPlayer object is 175 * in the <em>Preparing</em> state is undefined.</li> 176 * <li>An IllegalStateException is 177 * thrown if {@link #prepare()} or {@link #prepareAsync()} is called in 178 * any other state.</li> 179 * <li>While in the <em>Prepared</em> state, properties 180 * such as audio/sound volume, screenOnWhilePlaying, looping can be 181 * adjusted by invoking the corresponding set methods.</li> 182 * </ul> 183 * </li> 184 * <li>To start the playback, {@link #start()} must be called. After 185 * {@link #start()} returns successfully, the MediaPlayer object is in the 186 * <em>Started</em> state. {@link #isPlaying()} can be called to test 187 * whether the MediaPlayer object is in the <em>Started</em> state. 188 * <ul> 189 * <li>While in the <em>Started</em> state, the internal player engine calls 190 * a user supplied OnBufferingUpdateListener.onBufferingUpdate() callback 191 * method if a OnBufferingUpdateListener has been registered beforehand 192 * via {@link #setOnBufferingUpdateListener(OnBufferingUpdateListener)}. 193 * This callback allows applications to keep track of the buffering status 194 * while streaming audio/video.</li> 195 * <li>Calling {@link #start()} has not effect 196 * on a MediaPlayer object that is already in the <em>Started</em> state.</li> 197 * </ul> 198 * </li> 199 * <li>Playback can be paused and stopped, and the current playback position 200 * can be adjusted. Playback can be paused via {@link #pause()}. When the call to 201 * {@link #pause()} returns, the MediaPlayer object enters the 202 * <em>Paused</em> state. Note that the transition from the <em>Started</em> 203 * state to the <em>Paused</em> state and vice versa happens 204 * asynchronously in the player engine. It may take some time before 205 * the state is updated in calls to {@link #isPlaying()}, and it can be 206 * a number of seconds in the case of streamed content. 207 * <ul> 208 * <li>Calling {@link #start()} to resume playback for a paused 209 * MediaPlayer object, and the resumed playback 210 * position is the same as where it was paused. When the call to 211 * {@link #start()} returns, the paused MediaPlayer object goes back to 212 * the <em>Started</em> state.</li> 213 * <li>Calling {@link #pause()} has no effect on 214 * a MediaPlayer object that is already in the <em>Paused</em> state.</li> 215 * </ul> 216 * </li> 217 * <li>Calling {@link #stop()} stops playback and causes a 218 * MediaPlayer in the <em>Started</em>, <em>Paused</em>, <em>Prepared 219 * </em> or <em>PlaybackCompleted</em> state to enter the 220 * <em>Stopped</em> state. 221 * <ul> 222 * <li>Once in the <em>Stopped</em> state, playback cannot be started 223 * until {@link #prepare()} or {@link #prepareAsync()} are called to set 224 * the MediaPlayer object to the <em>Prepared</em> state again.</li> 225 * <li>Calling {@link #stop()} has no effect on a MediaPlayer 226 * object that is already in the <em>Stopped</em> state.</li> 227 * </ul> 228 * </li> 229 * <li>The playback position can be adjusted with a call to 230 * {@link #seekTo(int)}. 231 * <ul> 232 * <li>Although the asynchronuous {@link #seekTo(int)} 233 * call returns right way, the actual seek operation may take a while to 234 * finish, especially for audio/video being streamed. When the actual 235 * seek operation completes, the internal player engine calls a user 236 * supplied OnSeekComplete.onSeekComplete() if an OnSeekCompleteListener 237 * has been registered beforehand via 238 * {@link #setOnSeekCompleteListener(OnSeekCompleteListener)}.</li> 239 * <li>Please 240 * note that {@link #seekTo(int)} can also be called in the other states, 241 * such as <em>Prepared</em>, <em>Paused</em> and <em>PlaybackCompleted 242 * </em> state.</li> 243 * <li>Furthermore, the actual current playback position 244 * can be retrieved with a call to {@link #getCurrentPosition()}, which 245 * is helpful for applications such as a Music player that need to keep 246 * track of the playback progress.</li> 247 * </ul> 248 * </li> 249 * <li>When the playback reaches the end of stream, the playback completes. 250 * <ul> 251 * <li>If the looping mode was being set to <var>true</var>with 252 * {@link #setLooping(boolean)}, the MediaPlayer object shall remain in 253 * the <em>Started</em> state.</li> 254 * <li>If the looping mode was set to <var>false 255 * </var>, the player engine calls a user supplied callback method, 256 * OnCompletion.onCompletion(), if a OnCompletionListener is registered 257 * beforehand via {@link #setOnCompletionListener(OnCompletionListener)}. 258 * The invoke of the callback signals that the object is now in the <em> 259 * PlaybackCompleted</em> state.</li> 260 * <li>While in the <em>PlaybackCompleted</em> 261 * state, calling {@link #start()} can restart the playback from the 262 * beginning of the audio/video source.</li> 263 * </ul> 264 * 265 * 266 * <a name="Valid_and_Invalid_States"></a> 267 * <h3>Valid and invalid states</h3> 268 * 269 * <table border="0" cellspacing="0" cellpadding="0"> 270 * <tr><td>Method Name </p></td> 271 * <td>Valid Sates </p></td> 272 * <td>Invalid States </p></td> 273 * <td>Comments </p></td></tr> 274 * <tr><td>getCurrentPosition </p></td> 275 * <td>{Idle, Initialized, Prepared, Started, Paused, Stopped, 276 * PlaybackCompleted} </p></td> 277 * <td>{Error}</p></td> 278 * <td>Successful invoke of this method in a valid state does not change the 279 * state. Calling this method in an invalid state transfers the object 280 * to the <em>Error</em> state. </p></td></tr> 281 * <tr><td>getDuration </p></td> 282 * <td>{Prepared, Started, Paused, Stopped, PlaybackCompleted} </p></td> 283 * <td>{Idle, Initialized, Error} </p></td> 284 * <td>Successful invoke of this method in a valid state does not change the 285 * state. Calling this method in an invalid state transfers the object 286 * to the <em>Error</em> state. </p></td></tr> 287 * <tr><td>getVideoHeight </p></td> 288 * <td>{Idle, Initialized, Prepared, Started, Paused, Stopped, 289 * PlaybackCompleted}</p></td> 290 * <td>{Error}</p></td> 291 * <td>Successful invoke of this method in a valid state does not change the 292 * state. Calling this method in an invalid state transfers the object 293 * to the <em>Error</em> state. </p></td></tr> 294 * <tr><td>getVideoWidth </p></td> 295 * <td>{Idle, Initialized, Prepared, Started, Paused, Stopped, 296 * PlaybackCompleted}</p></td> 297 * <td>{Error}</p></td> 298 * <td>Successful invoke of this method in a valid state does not change 299 * the state. Calling this method in an invalid state transfers the 300 * object to the <em>Error</em> state. </p></td></tr> 301 * <tr><td>isPlaying </p></td> 302 * <td>{Idle, Initialized, Prepared, Started, Paused, Stopped, 303 * PlaybackCompleted}</p></td> 304 * <td>{Error}</p></td> 305 * <td>Successful invoke of this method in a valid state does not change 306 * the state. Calling this method in an invalid state transfers the 307 * object to the <em>Error</em> state. </p></td></tr> 308 * <tr><td>pause </p></td> 309 * <td>{Started, Paused}</p></td> 310 * <td>{Idle, Initialized, Prepared, Stopped, PlaybackCompleted, Error}</p></td> 311 * <td>Successful invoke of this method in a valid state transfers the 312 * object to the <em>Paused</em> state. Calling this method in an 313 * invalid state transfers the object to the <em>Error</em> state.</p></td></tr> 314 * <tr><td>prepare </p></td> 315 * <td>{Initialized, Stopped} </p></td> 316 * <td>{Idle, Prepared, Started, Paused, PlaybackCompleted, Error} </p></td> 317 * <td>Successful invoke of this method in a valid state transfers the 318 * object to the <em>Prepared</em> state. Calling this method in an 319 * invalid state throws an IllegalStateException.</p></td></tr> 320 * <tr><td>prepareAsync </p></td> 321 * <td>{Initialized, Stopped} </p></td> 322 * <td>{Idle, Prepared, Started, Paused, PlaybackCompleted, Error} </p></td> 323 * <td>Successful invoke of this method in a valid state transfers the 324 * object to the <em>Preparing</em> state. Calling this method in an 325 * invalid state throws an IllegalStateException.</p></td></tr> 326 * <tr><td>release </p></td> 327 * <td>any </p></td> 328 * <td>{} </p></td> 329 * <td>After {@link #release()}, the object is no longer available. </p></td></tr> 330 * <tr><td>reset </p></td> 331 * <td>{Idle, Initialized, Prepared, Started, Paused, Stopped, 332 * PlaybackCompleted, Error}</p></td> 333 * <td>{}</p></td> 334 * <td>After {@link #reset()}, the object is like being just created.</p></td></tr> 335 * <tr><td>seekTo </p></td> 336 * <td>{Prepared, Started, Paused, PlaybackCompleted} </p></td> 337 * <td>{Idle, Initialized, Stopped, Error}</p></td> 338 * <td>Successful invoke of this method in a valid state does not change 339 * the state. Calling this method in an invalid state transfers the 340 * object to the <em>Error</em> state. </p></td></tr> 341 * <tr><td>setAudioStreamType </p></td> 342 * <td>{Idle, Initialized, Stopped, Prepared, Started, Paused, 343 * PlaybackCompleted}</p></td> 344 * <td>{Error}</p></td> 345 * <td>Successful invoke of this method does not change the state.</p></td></tr> 346 * <tr><td>setDataSource </p></td> 347 * <td>{Idle} </p></td> 348 * <td>{Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted, 349 * Error} </p></td> 350 * <td>Successful invoke of this method in a valid state transfers the 351 * object to the <em>Initialized</em> state. Calling this method in an 352 * invalid state throws an IllegalStateException.</p></td></tr> 353 * <tr><td>setDisplay </p></td> 354 * <td>any </p></td> 355 * <td>{} </p></td> 356 * <td>This method can be called in any state and calling it does not change 357 * the object state. </p></td></tr> 358 * <tr><td>setLooping </p></td> 359 * <td>{Idle, Initialized, Stopped, Prepared, Started, Paused, 360 * PlaybackCompleted}</p></td> 361 * <td>{Error}</p></td> 362 * <td>Successful invoke of this method in a valid state does not change 363 * the state. Calling this method in an 364 * invalid state transfers the object to the <em>Error</em> state.</p></td></tr> 365 * <tr><td>isLooping </p></td> 366 * <td>any </p></td> 367 * <td>{} </p></td> 368 * <td>This method can be called in any state and calling it does not change 369 * the object state. </p></td></tr> 370 * <tr><td>setOnBufferingUpdateListener </p></td> 371 * <td>any </p></td> 372 * <td>{} </p></td> 373 * <td>This method can be called in any state and calling it does not change 374 * the object state. </p></td></tr> 375 * <tr><td>setOnCompletionListener </p></td> 376 * <td>any </p></td> 377 * <td>{} </p></td> 378 * <td>This method can be called in any state and calling it does not change 379 * the object state. </p></td></tr> 380 * <tr><td>setOnErrorListener </p></td> 381 * <td>any </p></td> 382 * <td>{} </p></td> 383 * <td>This method can be called in any state and calling it does not change 384 * the object state. </p></td></tr> 385 * <tr><td>setOnPreparedListener </p></td> 386 * <td>any </p></td> 387 * <td>{} </p></td> 388 * <td>This method can be called in any state and calling it does not change 389 * the object state. </p></td></tr> 390 * <tr><td>setOnSeekCompleteListener </p></td> 391 * <td>any </p></td> 392 * <td>{} </p></td> 393 * <td>This method can be called in any state and calling it does not change 394 * the object state. </p></td></tr> 395 * <tr><td>setScreenOnWhilePlaying</></td> 396 * <td>any </p></td> 397 * <td>{} </p></td> 398 * <td>This method can be called in any state and calling it does not change 399 * the object state. </p></td></tr> 400 * <tr><td>setVolume </p></td> 401 * <td>{Idle, Initialized, Stopped, Prepared, Started, Paused, 402 * PlaybackCompleted}</p></td> 403 * <td>{Error}</p></td> 404 * <td>Successful invoke of this method does not change the state. 405 * <tr><td>setWakeMode </p></td> 406 * <td>any </p></td> 407 * <td>{} </p></td> 408 * <td>This method can be called in any state and calling it does not change 409 * the object state.</p></td></tr> 410 * <tr><td>start </p></td> 411 * <td>{Prepared, Started, Paused, PlaybackCompleted}</p></td> 412 * <td>{Idle, Initialized, Stopped, Error}</p></td> 413 * <td>Successful invoke of this method in a valid state transfers the 414 * object to the <em>Started</em> state. Calling this method in an 415 * invalid state transfers the object to the <em>Error</em> state.</p></td></tr> 416 * <tr><td>stop </p></td> 417 * <td>{Prepared, Started, Stopped, Paused, PlaybackCompleted}</p></td> 418 * <td>{Idle, Initialized, Error}</p></td> 419 * <td>Successful invoke of this method in a valid state transfers the 420 * object to the <em>Stopped</em> state. Calling this method in an 421 * invalid state transfers the object to the <em>Error</em> state.</p></td></tr> 422 * </table> 423 * 424 * <a name="Permissions"></a> 425 * <h3>Permissions</h3> 426 * <p>One may need to declare a corresponding WAKE_LOCK permission {@link 427 * android.R.styleable#AndroidManifestUsesPermission <uses-permission>} 428 * element. 429 * 430 */ 431public class MediaPlayer 432{ 433 static { 434 System.loadLibrary("media_jni"); 435 } 436 437 private final static String TAG = "MediaPlayer"; 438 439 private int mNativeContext; // accessed by native methods 440 private int mListenerContext; // accessed by native methods 441 private Surface mSurface; // accessed by native methods 442 private SurfaceHolder mSurfaceHolder; 443 private EventHandler mEventHandler; 444 private PowerManager.WakeLock mWakeLock = null; 445 private boolean mScreenOnWhilePlaying; 446 private boolean mStayAwake; 447 448 /** 449 * Default constructor. Consider using one of the create() methods for 450 * synchronously instantiating a MediaPlayer from a Uri or resource. 451 * <p>When done with the MediaPlayer, you should call {@link #release()}, 452 * to free the resources. If not released, too many MediaPlayer instances may 453 * result in an exception.</p> 454 */ 455 public MediaPlayer() { 456 457 Looper looper; 458 if ((looper = Looper.myLooper()) != null) { 459 mEventHandler = new EventHandler(this, looper); 460 } else if ((looper = Looper.getMainLooper()) != null) { 461 mEventHandler = new EventHandler(this, looper); 462 } else { 463 mEventHandler = null; 464 } 465 466 /* Native setup requires a weak reference to our object. 467 * It's easier to create it here than in C++. 468 */ 469 native_setup(new WeakReference<MediaPlayer>(this)); 470 } 471 472 /* 473 * Update the MediaPlayer ISurface. Call after updating mSurface. 474 */ 475 private native void _setVideoSurface(); 476 477 /** 478 * Sets the SurfaceHolder to use for displaying the video portion of the media. 479 * This call is optional. Not calling it when playing back a video will 480 * result in only the audio track being played. 481 * 482 * @param sh the SurfaceHolder to use for video display 483 */ 484 public void setDisplay(SurfaceHolder sh) { 485 mSurfaceHolder = sh; 486 if (sh != null) { 487 mSurface = sh.getSurface(); 488 } else { 489 mSurface = null; 490 } 491 _setVideoSurface(); 492 updateSurfaceScreenOn(); 493 } 494 495 /** 496 * Convenience method to create a MediaPlayer for a given Uri. 497 * On success, {@link #prepare()} will already have been called and must not be called again. 498 * <p>When done with the MediaPlayer, you should call {@link #release()}, 499 * to free the resources. If not released, too many MediaPlayer instances will 500 * result in an exception.</p> 501 * 502 * @param context the Context to use 503 * @param uri the Uri from which to get the datasource 504 * @return a MediaPlayer object, or null if creation failed 505 */ 506 public static MediaPlayer create(Context context, Uri uri) { 507 return create (context, uri, null); 508 } 509 510 /** 511 * Convenience method to create a MediaPlayer for a given Uri. 512 * On success, {@link #prepare()} will already have been called and must not be called again. 513 * <p>When done with the MediaPlayer, you should call {@link #release()}, 514 * to free the resources. If not released, too many MediaPlayer instances will 515 * result in an exception.</p> 516 * 517 * @param context the Context to use 518 * @param uri the Uri from which to get the datasource 519 * @param holder the SurfaceHolder to use for displaying the video 520 * @return a MediaPlayer object, or null if creation failed 521 */ 522 public static MediaPlayer create(Context context, Uri uri, SurfaceHolder holder) { 523 524 try { 525 MediaPlayer mp = new MediaPlayer(); 526 mp.setDataSource(context, uri); 527 if (holder != null) { 528 mp.setDisplay(holder); 529 } 530 mp.prepare(); 531 return mp; 532 } catch (IOException ex) { 533 Log.d(TAG, "create failed:", ex); 534 // fall through 535 } catch (IllegalArgumentException ex) { 536 Log.d(TAG, "create failed:", ex); 537 // fall through 538 } catch (SecurityException ex) { 539 Log.d(TAG, "create failed:", ex); 540 // fall through 541 } 542 543 return null; 544 } 545 546 /** 547 * Convenience method to create a MediaPlayer for a given resource id. 548 * On success, {@link #prepare()} will already have been called and must not be called again. 549 * <p>When done with the MediaPlayer, you should call {@link #release()}, 550 * to free the resources. If not released, too many MediaPlayer instances will 551 * result in an exception.</p> 552 * 553 * @param context the Context to use 554 * @param resid the raw resource id (<var>R.raw.<something></var>) for 555 * the resource to use as the datasource 556 * @return a MediaPlayer object, or null if creation failed 557 */ 558 public static MediaPlayer create(Context context, int resid) { 559 try { 560 AssetFileDescriptor afd = context.getResources().openRawResourceFd(resid); 561 if (afd == null) return null; 562 563 MediaPlayer mp = new MediaPlayer(); 564 mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength()); 565 afd.close(); 566 mp.prepare(); 567 return mp; 568 } catch (IOException ex) { 569 Log.d(TAG, "create failed:", ex); 570 // fall through 571 } catch (IllegalArgumentException ex) { 572 Log.d(TAG, "create failed:", ex); 573 // fall through 574 } catch (SecurityException ex) { 575 Log.d(TAG, "create failed:", ex); 576 // fall through 577 } 578 return null; 579 } 580 581 /** 582 * Sets the data source as a content Uri. 583 * 584 * @param context the Context to use when resolving the Uri 585 * @param uri the Content URI of the data you want to play 586 * @throws IllegalStateException if it is called in an invalid state 587 */ 588 public void setDataSource(Context context, Uri uri) 589 throws IOException, IllegalArgumentException, SecurityException, IllegalStateException { 590 591 String scheme = uri.getScheme(); 592 if(scheme == null || scheme.equals("file")) { 593 setDataSource(uri.getPath()); 594 return; 595 } 596 597 AssetFileDescriptor fd = null; 598 try { 599 ContentResolver resolver = context.getContentResolver(); 600 fd = resolver.openAssetFileDescriptor(uri, "r"); 601 if (fd == null) { 602 return; 603 } 604 // Note: using getDeclaredLength so that our behavior is the same 605 // as previous versions when the content provider is returning 606 // a full file. 607 if (fd.getDeclaredLength() < 0) { 608 setDataSource(fd.getFileDescriptor()); 609 } else { 610 setDataSource(fd.getFileDescriptor(), fd.getStartOffset(), fd.getDeclaredLength()); 611 } 612 return; 613 } catch (SecurityException ex) { 614 } catch (IOException ex) { 615 } finally { 616 if (fd != null) { 617 fd.close(); 618 } 619 } 620 Log.d(TAG, "Couldn't open file on client side, trying server side"); 621 setDataSource(uri.toString()); 622 return; 623 } 624 625 /** 626 * Sets the data source (file-path or http/rtsp URL) to use. 627 * 628 * @param path the path of the file, or the http/rtsp URL of the stream you want to play 629 * @throws IllegalStateException if it is called in an invalid state 630 */ 631 public native void setDataSource(String path) throws IOException, IllegalArgumentException, IllegalStateException; 632 633 /** 634 * Sets the data source (FileDescriptor) to use. It is the caller's responsibility 635 * to close the file descriptor. It is safe to do so as soon as this call returns. 636 * 637 * @param fd the FileDescriptor for the file you want to play 638 * @throws IllegalStateException if it is called in an invalid state 639 */ 640 public void setDataSource(FileDescriptor fd) 641 throws IOException, IllegalArgumentException, IllegalStateException { 642 // intentionally less than LONG_MAX 643 setDataSource(fd, 0, 0x7ffffffffffffffL); 644 } 645 646 /** 647 * Sets the data source (FileDescriptor) to use. It is the caller's responsibility 648 * to close the file descriptor. It is safe to do so as soon as this call returns. 649 * 650 * @param fd the FileDescriptor for the file you want to play 651 * @param offset the offset into the file where the data to be played starts, in bytes 652 * @param length the length in bytes of the data to be played 653 * @throws IllegalStateException if it is called in an invalid state 654 */ 655 public native void setDataSource(FileDescriptor fd, long offset, long length) 656 throws IOException, IllegalArgumentException, IllegalStateException; 657 658 /** 659 * Prepares the player for playback, synchronously. 660 * 661 * After setting the datasource and the display surface, you need to either 662 * call prepare() or prepareAsync(). For files, it is OK to call prepare(), 663 * which blocks until MediaPlayer is ready for playback. 664 * 665 * @throws IllegalStateException if it is called in an invalid state 666 */ 667 public native void prepare() throws IOException, IllegalStateException; 668 669 /** 670 * Prepares the player for playback, asynchronously. 671 * 672 * After setting the datasource and the display surface, you need to either 673 * call prepare() or prepareAsync(). For streams, you should call prepareAsync(), 674 * which returns immediately, rather than blocking until enough data has been 675 * buffered. 676 * 677 * @throws IllegalStateException if it is called in an invalid state 678 */ 679 public native void prepareAsync() throws IllegalStateException; 680 681 /** 682 * Starts or resumes playback. If playback had previously been paused, 683 * playback will continue from where it was paused. If playback had 684 * been stopped, or never started before, playback will start at the 685 * beginning. 686 * 687 * @throws IllegalStateException if it is called in an invalid state 688 */ 689 public void start() throws IllegalStateException { 690 stayAwake(true); 691 _start(); 692 } 693 694 private native void _start() throws IllegalStateException; 695 696 /** 697 * Stops playback after playback has been stopped or paused. 698 * 699 * @throws IllegalStateException if the internal player engine has not been 700 * initialized. 701 */ 702 public void stop() throws IllegalStateException { 703 stayAwake(false); 704 _stop(); 705 } 706 707 private native void _stop() throws IllegalStateException; 708 709 /** 710 * Pauses playback. Call start() to resume. 711 * 712 * @throws IllegalStateException if the internal player engine has not been 713 * initialized. 714 */ 715 public void pause() throws IllegalStateException { 716 stayAwake(false); 717 _pause(); 718 } 719 720 private native void _pause() throws IllegalStateException; 721 722 /** 723 * Set the low-level power management behavior for this MediaPlayer. This 724 * can be used when the MediaPlayer is not playing through a SurfaceHolder 725 * set with {@link #setDisplay(SurfaceHolder)} and thus can use the 726 * high-level {@link #setScreenOnWhilePlaying(boolean)} feature. 727 * 728 * <p>This function has the MediaPlayer access the low-level power manager 729 * service to control the device's power usage while playing is occurring. 730 * The parameter is a combination of {@link android.os.PowerManager} wake flags. 731 * Use of this method requires {@link android.Manifest.permission#WAKE_LOCK} 732 * permission. 733 * By default, no attempt is made to keep the device awake during playback. 734 * 735 * @param context the Context to use 736 * @param mode the power/wake mode to set 737 * @see android.os.PowerManager 738 */ 739 public void setWakeMode(Context context, int mode) { 740 boolean washeld = false; 741 if (mWakeLock != null) { 742 if (mWakeLock.isHeld()) { 743 washeld = true; 744 mWakeLock.release(); 745 } 746 mWakeLock = null; 747 } 748 749 PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE); 750 mWakeLock = pm.newWakeLock(mode|PowerManager.ON_AFTER_RELEASE, MediaPlayer.class.getName()); 751 mWakeLock.setReferenceCounted(false); 752 if (washeld) { 753 mWakeLock.acquire(); 754 } 755 } 756 757 /** 758 * Control whether we should use the attached SurfaceHolder to keep the 759 * screen on while video playback is occurring. This is the preferred 760 * method over {@link #setWakeMode} where possible, since it doesn't 761 * require that the application have permission for low-level wake lock 762 * access. 763 * 764 * @param screenOn Supply true to keep the screen on, false to allow it 765 * to turn off. 766 */ 767 public void setScreenOnWhilePlaying(boolean screenOn) { 768 if (mScreenOnWhilePlaying != screenOn) { 769 mScreenOnWhilePlaying = screenOn; 770 updateSurfaceScreenOn(); 771 } 772 } 773 774 private void stayAwake(boolean awake) { 775 if (mWakeLock != null) { 776 if (awake && !mWakeLock.isHeld()) { 777 mWakeLock.acquire(); 778 } else if (!awake && mWakeLock.isHeld()) { 779 mWakeLock.release(); 780 } 781 } 782 mStayAwake = awake; 783 updateSurfaceScreenOn(); 784 } 785 786 private void updateSurfaceScreenOn() { 787 if (mSurfaceHolder != null) { 788 mSurfaceHolder.setKeepScreenOn(mScreenOnWhilePlaying && mStayAwake); 789 } 790 } 791 792 /** 793 * Returns the width of the video. 794 * 795 * @return the width of the video, or 0 if there is no video, 796 * no display surface was set, or prepare()/prepareAsync() 797 * have not completed yet 798 */ 799 public native int getVideoWidth(); 800 801 /** 802 * Returns the height of the video. 803 * 804 * @return the height of the video, or 0 if there is no video, 805 * no display surface was set, or prepare()/prepareAsync() 806 * have not completed yet 807 */ 808 public native int getVideoHeight(); 809 810 /** 811 * Checks whether the MediaPlayer is playing. 812 * 813 * @return true if currently playing, false otherwise 814 */ 815 public native boolean isPlaying(); 816 817 /** 818 * Seeks to specified time position. 819 * 820 * @param msec the offset in milliseconds from the start to seek to 821 * @throws IllegalStateException if the internal player engine has not been 822 * initialized 823 */ 824 public native void seekTo(int msec) throws IllegalStateException; 825 826 /** 827 * Gets the current playback position. 828 * 829 * @return the current position in milliseconds 830 */ 831 public native int getCurrentPosition(); 832 833 /** 834 * Gets the duration of the file. 835 * 836 * @return the duration in milliseconds 837 */ 838 public native int getDuration(); 839 840 /** 841 * Releases resources associated with this MediaPlayer object. 842 * It is considered good practice to call this method when you're 843 * done using the MediaPlayer. 844 */ 845 public void release() { 846 stayAwake(false); 847 updateSurfaceScreenOn(); 848 mOnPreparedListener = null; 849 mOnBufferingUpdateListener = null; 850 mOnCompletionListener = null; 851 mOnSeekCompleteListener = null; 852 mOnErrorListener = null; 853 mOnInfoListener = null; 854 mOnVideoSizeChangedListener = null; 855 _release(); 856 } 857 858 private native void _release(); 859 860 /** 861 * Resets the MediaPlayer to its uninitialized state. After calling 862 * this method, you will have to initialize it again by setting the 863 * data source and calling prepare(). 864 */ 865 public void reset() { 866 stayAwake(false); 867 _reset(); 868 // make sure none of the listeners get called anymore 869 mEventHandler.removeCallbacksAndMessages(null); 870 } 871 872 private native void _reset(); 873 874 /** 875 * Sets the audio stream type for this MediaPlayer. See {@link AudioManager} 876 * for a list of stream types. 877 * 878 * @param streamtype the audio stream type 879 * @see android.media.AudioManager 880 */ 881 public native void setAudioStreamType(int streamtype); 882 883 /** 884 * Sets the player to be looping or non-looping. 885 * 886 * @param looping whether to loop or not 887 */ 888 public native void setLooping(boolean looping); 889 890 /** 891 * Checks whether the MediaPlayer is looping or non-looping. 892 * 893 * @return true if the MediaPlayer is currently looping, false otherwise 894 */ 895 public native boolean isLooping(); 896 897 /** 898 * Sets the volume on this player. 899 * This API is recommended for balancing the output of audio streams 900 * within an application. Unless you are writing an application to 901 * control user settings, this API should be used in preference to 902 * {@link AudioManager#setStreamVolume(int, int, int)} which sets the volume of ALL streams of 903 * a particular type. Note that the passed volume values are raw scalars. 904 * UI controls should be scaled logarithmically. 905 * 906 * @param leftVolume left volume scalar 907 * @param rightVolume right volume scalar 908 */ 909 public native void setVolume(float leftVolume, float rightVolume); 910 911 /** 912 * Currently not implemented, returns null. 913 * @deprecated 914 * @hide 915 */ 916 public native Bitmap getFrameAt(int msec) throws IllegalStateException; 917 918 private native final void native_setup(Object mediaplayer_this); 919 private native final void native_finalize(); 920 @Override 921 protected void finalize() { native_finalize(); } 922 923 /* Do not change these values without updating their counterparts 924 * in include/media/mediaplayer.h! 925 */ 926 private static final int MEDIA_NOP = 0; // interface test message 927 private static final int MEDIA_PREPARED = 1; 928 private static final int MEDIA_PLAYBACK_COMPLETE = 2; 929 private static final int MEDIA_BUFFERING_UPDATE = 3; 930 private static final int MEDIA_SEEK_COMPLETE = 4; 931 private static final int MEDIA_SET_VIDEO_SIZE = 5; 932 private static final int MEDIA_ERROR = 100; 933 private static final int MEDIA_INFO = 200; 934 935 private class EventHandler extends Handler 936 { 937 private MediaPlayer mMediaPlayer; 938 939 public EventHandler(MediaPlayer mp, Looper looper) { 940 super(looper); 941 mMediaPlayer = mp; 942 } 943 944 @Override 945 public void handleMessage(Message msg) { 946 if (mMediaPlayer.mNativeContext == 0) { 947 Log.w(TAG, "mediaplayer went away with unhandled events"); 948 return; 949 } 950 switch(msg.what) { 951 case MEDIA_PREPARED: 952 if (mOnPreparedListener != null) 953 mOnPreparedListener.onPrepared(mMediaPlayer); 954 return; 955 956 case MEDIA_PLAYBACK_COMPLETE: 957 if (mOnCompletionListener != null) 958 mOnCompletionListener.onCompletion(mMediaPlayer); 959 stayAwake(false); 960 return; 961 962 case MEDIA_BUFFERING_UPDATE: 963 if (mOnBufferingUpdateListener != null) 964 mOnBufferingUpdateListener.onBufferingUpdate(mMediaPlayer, msg.arg1); 965 return; 966 967 case MEDIA_SEEK_COMPLETE: 968 if (mOnSeekCompleteListener != null) 969 mOnSeekCompleteListener.onSeekComplete(mMediaPlayer); 970 return; 971 972 case MEDIA_SET_VIDEO_SIZE: 973 if (mOnVideoSizeChangedListener != null) 974 mOnVideoSizeChangedListener.onVideoSizeChanged(mMediaPlayer, msg.arg1, msg.arg2); 975 return; 976 977 case MEDIA_ERROR: 978 // For PV specific error values (msg.arg2) look in 979 // opencore/pvmi/pvmf/include/pvmf_return_codes.h 980 Log.e(TAG, "Error (" + msg.arg1 + "," + msg.arg2 + ")"); 981 boolean error_was_handled = false; 982 if (mOnErrorListener != null) { 983 error_was_handled = mOnErrorListener.onError(mMediaPlayer, msg.arg1, msg.arg2); 984 } 985 if (mOnCompletionListener != null && ! error_was_handled) { 986 mOnCompletionListener.onCompletion(mMediaPlayer); 987 } 988 stayAwake(false); 989 return; 990 991 case MEDIA_INFO: 992 // For PV specific code values (msg.arg2) look in 993 // opencore/pvmi/pvmf/include/pvmf_return_codes.h 994 Log.i(TAG, "Info (" + msg.arg1 + "," + msg.arg2 + ")"); 995 if (mOnInfoListener != null) { 996 mOnInfoListener.onInfo(mMediaPlayer, msg.arg1, msg.arg2); 997 } 998 // No real default action so far. 999 return; 1000 1001 case MEDIA_NOP: // interface test message - ignore 1002 break; 1003 1004 default: 1005 Log.e(TAG, "Unknown message type " + msg.what); 1006 return; 1007 } 1008 } 1009 } 1010 1011 /** 1012 * Called from native code when an interesting event happens. This method 1013 * just uses the EventHandler system to post the event back to the main app thread. 1014 * We use a weak reference to the original MediaPlayer object so that the native 1015 * code is safe from the object disappearing from underneath it. (This is 1016 * the cookie passed to native_setup().) 1017 */ 1018 private static void postEventFromNative(Object mediaplayer_ref, 1019 int what, int arg1, int arg2, Object obj) 1020 { 1021 MediaPlayer mp = (MediaPlayer)((WeakReference)mediaplayer_ref).get(); 1022 if (mp == null) { 1023 return; 1024 } 1025 1026 if (mp.mEventHandler != null) { 1027 Message m = mp.mEventHandler.obtainMessage(what, arg1, arg2, obj); 1028 mp.mEventHandler.sendMessage(m); 1029 } 1030 } 1031 1032 /** 1033 * Interface definition for a callback to be invoked when the media 1034 * source is ready for playback. 1035 */ 1036 public interface OnPreparedListener 1037 { 1038 /** 1039 * Called when the media file is ready for playback. 1040 * 1041 * @param mp the MediaPlayer that is ready for playback 1042 */ 1043 void onPrepared(MediaPlayer mp); 1044 } 1045 1046 /** 1047 * Register a callback to be invoked when the media source is ready 1048 * for playback. 1049 * 1050 * @param listener the callback that will be run 1051 */ 1052 public void setOnPreparedListener(OnPreparedListener listener) 1053 { 1054 mOnPreparedListener = listener; 1055 } 1056 1057 private OnPreparedListener mOnPreparedListener; 1058 1059 /** 1060 * Interface definition for a callback to be invoked when playback of 1061 * a media source has completed. 1062 */ 1063 public interface OnCompletionListener 1064 { 1065 /** 1066 * Called when the end of a media source is reached during playback. 1067 * 1068 * @param mp the MediaPlayer that reached the end of the file 1069 */ 1070 void onCompletion(MediaPlayer mp); 1071 } 1072 1073 /** 1074 * Register a callback to be invoked when the end of a media source 1075 * has been reached during playback. 1076 * 1077 * @param listener the callback that will be run 1078 */ 1079 public void setOnCompletionListener(OnCompletionListener listener) 1080 { 1081 mOnCompletionListener = listener; 1082 } 1083 1084 private OnCompletionListener mOnCompletionListener; 1085 1086 /** 1087 * Interface definition of a callback to be invoked indicating buffering 1088 * status of a media resource being streamed over the network. 1089 */ 1090 public interface OnBufferingUpdateListener 1091 { 1092 /** 1093 * Called to update status in buffering a media stream. 1094 * 1095 * @param mp the MediaPlayer the update pertains to 1096 * @param percent the percentage (0-100) of the buffer 1097 * that has been filled thus far 1098 */ 1099 void onBufferingUpdate(MediaPlayer mp, int percent); 1100 } 1101 1102 /** 1103 * Register a callback to be invoked when the status of a network 1104 * stream's buffer has changed. 1105 * 1106 * @param listener the callback that will be run. 1107 */ 1108 public void setOnBufferingUpdateListener(OnBufferingUpdateListener listener) 1109 { 1110 mOnBufferingUpdateListener = listener; 1111 } 1112 1113 private OnBufferingUpdateListener mOnBufferingUpdateListener; 1114 1115 /** 1116 * Interface definition of a callback to be invoked indicating 1117 * the completion of a seek operation. 1118 */ 1119 public interface OnSeekCompleteListener 1120 { 1121 /** 1122 * Called to indicate the completion of a seek operation. 1123 * 1124 * @param mp the MediaPlayer that issued the seek operation 1125 */ 1126 public void onSeekComplete(MediaPlayer mp); 1127 } 1128 1129 /** 1130 * Register a callback to be invoked when a seek operation has been 1131 * completed. 1132 * 1133 * @param listener the callback that will be run 1134 */ 1135 public void setOnSeekCompleteListener(OnSeekCompleteListener listener) 1136 { 1137 mOnSeekCompleteListener = listener; 1138 } 1139 1140 private OnSeekCompleteListener mOnSeekCompleteListener; 1141 1142 /** 1143 * Interface definition of a callback to be invoked when the 1144 * video size is first known or updated 1145 */ 1146 public interface OnVideoSizeChangedListener 1147 { 1148 /** 1149 * Called to indicate the video size 1150 * 1151 * @param mp the MediaPlayer associated with this callback 1152 * @param width the width of the video 1153 * @param height the height of the video 1154 */ 1155 public void onVideoSizeChanged(MediaPlayer mp, int width, int height); 1156 } 1157 1158 /** 1159 * Register a callback to be invoked when the video size is 1160 * known or updated. 1161 * 1162 * @param listener the callback that will be run 1163 */ 1164 public void setOnVideoSizeChangedListener(OnVideoSizeChangedListener listener) 1165 { 1166 mOnVideoSizeChangedListener = listener; 1167 } 1168 1169 private OnVideoSizeChangedListener mOnVideoSizeChangedListener; 1170 1171 /* Do not change these values without updating their counterparts 1172 * in include/media/mediaplayer.h! 1173 */ 1174 /** Unspecified media player error. 1175 * @see android.media.MediaPlayer.OnErrorListener 1176 */ 1177 public static final int MEDIA_ERROR_UNKNOWN = 1; 1178 1179 /** Media server died. In this case, the application must release the 1180 * MediaPlayer object and instantiate a new one. 1181 * @see android.media.MediaPlayer.OnErrorListener 1182 */ 1183 public static final int MEDIA_ERROR_SERVER_DIED = 100; 1184 1185 /** The video is streamed and its container is not valid for progressive 1186 * playback i.e the video's index (e.g moov atom) is not at the start of the 1187 * file. 1188 * @see android.media.MediaPlayer.OnErrorListener 1189 */ 1190 public static final int MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK = 200; 1191 1192 /** 1193 * Interface definition of a callback to be invoked when there 1194 * has been an error during an asynchronous operation (other errors 1195 * will throw exceptions at method call time). 1196 */ 1197 public interface OnErrorListener 1198 { 1199 /** 1200 * Called to indicate an error. 1201 * 1202 * @param mp the MediaPlayer the error pertains to 1203 * @param what the type of error that has occurred: 1204 * <ul> 1205 * <li>{@link #MEDIA_ERROR_UNKNOWN} 1206 * <li>{@link #MEDIA_ERROR_SERVER_DIED} 1207 * </ul> 1208 * @param extra an extra code, specific to the error. Typically 1209 * implementation dependant. 1210 * @return True if the method handled the error, false if it didn't. 1211 * Returning false, or not having an OnErrorListener at all, will 1212 * cause the OnCompletionListener to be called. 1213 */ 1214 boolean onError(MediaPlayer mp, int what, int extra); 1215 } 1216 1217 /** 1218 * Register a callback to be invoked when an error has happened 1219 * during an asynchronous operation. 1220 * 1221 * @param listener the callback that will be run 1222 */ 1223 public void setOnErrorListener(OnErrorListener listener) 1224 { 1225 mOnErrorListener = listener; 1226 } 1227 1228 private OnErrorListener mOnErrorListener; 1229 1230 1231 /* Do not change these values without updating their counterparts 1232 * in include/media/mediaplayer.h! 1233 */ 1234 /** Unspecified media player info. 1235 * @see android.media.MediaPlayer.OnInfoListener 1236 */ 1237 public static final int MEDIA_INFO_UNKNOWN = 1; 1238 1239 /** The video is too complex for the decoder: it can't decode frames fast 1240 * enough. Possibly only the audio plays fine at this stage. 1241 * @see android.media.MediaPlayer.OnInfoListener 1242 */ 1243 public static final int MEDIA_INFO_VIDEO_TRACK_LAGGING = 700; 1244 1245 /** Bad interleaving means that a media has been improperly interleaved or 1246 * not interleaved at all, e.g has all the video samples first then all the 1247 * audio ones. Video is playing but a lot of disk seeks may be happening. 1248 * @see android.media.MediaPlayer.OnInfoListener 1249 */ 1250 public static final int MEDIA_INFO_BAD_INTERLEAVING = 800; 1251 1252 /** The media cannot be seeked (e.g live stream) 1253 * @see android.media.MediaPlayer.OnInfoListener 1254 */ 1255 public static final int MEDIA_INFO_NOT_SEEKABLE = 801; 1256 1257 /** 1258 * Interface definition of a callback to be invoked to communicate some 1259 * info and/or warning about the media or its playback. 1260 */ 1261 public interface OnInfoListener 1262 { 1263 /** 1264 * Called to indicate an info or a warning. 1265 * 1266 * @param mp the MediaPlayer the info pertains to. 1267 * @param what the type of info or warning. 1268 * <ul> 1269 * <li>{@link #MEDIA_INFO_UNKNOWN} 1270 * <li>{@link #MEDIA_INFO_VIDEO_TRACK_LAGGING} 1271 * <li>{@link #MEDIA_INFO_BAD_INTERLEAVING} 1272 * <li>{@link #MEDIA_INFO_NOT_SEEKABLE} 1273 * </ul> 1274 * @param extra an extra code, specific to the info. Typically 1275 * implementation dependant. 1276 * @return True if the method handled the info, false if it didn't. 1277 * Returning false, or not having an OnErrorListener at all, will 1278 * cause the info to be discarded. 1279 */ 1280 boolean onInfo(MediaPlayer mp, int what, int extra); 1281 } 1282 1283 /** 1284 * Register a callback to be invoked when an info/warning is available. 1285 * 1286 * @param listener the callback that will be run 1287 */ 1288 public void setOnInfoListener(OnInfoListener listener) 1289 { 1290 mOnInfoListener = listener; 1291 } 1292 1293 private OnInfoListener mOnInfoListener; 1294} 1295