MediaRecorder.java revision e64d9a236e4704abf53d3b7eea2eb066f23cf402
1/* 2 * Copyright (C) 2007 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.media.CamcorderProfile; 20import android.hardware.Camera; 21import android.os.Handler; 22import android.os.Looper; 23import android.os.Message; 24import android.util.Log; 25import android.view.Surface; 26import java.io.IOException; 27import java.io.FileNotFoundException; 28import java.io.FileOutputStream; 29import java.io.FileDescriptor; 30import java.lang.ref.WeakReference; 31 32/** 33 * Used to record audio and video. The recording control is based on a 34 * simple state machine (see below). 35 * 36 * <p><img src="{@docRoot}images/mediarecorder_state_diagram.gif" border="0" /> 37 * </p> 38 * 39 * <p>A common case of using MediaRecorder to record audio works as follows: 40 * 41 * <pre>MediaRecorder recorder = new MediaRecorder(); 42 * recorder.setAudioSource(MediaRecorder.AudioSource.MIC); 43 * recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); 44 * recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); 45 * recorder.setOutputFile(PATH_NAME); 46 * recorder.prepare(); 47 * recorder.start(); // Recording is now started 48 * ... 49 * recorder.stop(); 50 * recorder.reset(); // You can reuse the object by going back to setAudioSource() step 51 * recorder.release(); // Now the object cannot be reused 52 * </pre> 53 * 54 * <p>See the <a href="{@docRoot}guide/topics/media/index.html">Audio and Video</a> 55 * documentation for additional help with using MediaRecorder. 56 * <p>Note: Currently, MediaRecorder does not work on the emulator. 57 */ 58public class MediaRecorder 59{ 60 static { 61 System.loadLibrary("media_jni"); 62 native_init(); 63 } 64 private final static String TAG = "MediaRecorder"; 65 66 // The two fields below are accessed by native methods 67 @SuppressWarnings("unused") 68 private int mNativeContext; 69 70 @SuppressWarnings("unused") 71 private Surface mSurface; 72 73 private String mPath; 74 private FileDescriptor mFd; 75 private EventHandler mEventHandler; 76 private OnErrorListener mOnErrorListener; 77 private OnInfoListener mOnInfoListener; 78 79 /** 80 * Default constructor. 81 */ 82 public MediaRecorder() { 83 84 Looper looper; 85 if ((looper = Looper.myLooper()) != null) { 86 mEventHandler = new EventHandler(this, looper); 87 } else if ((looper = Looper.getMainLooper()) != null) { 88 mEventHandler = new EventHandler(this, looper); 89 } else { 90 mEventHandler = null; 91 } 92 93 /* Native setup requires a weak reference to our object. 94 * It's easier to create it here than in C++. 95 */ 96 native_setup(new WeakReference<MediaRecorder>(this)); 97 } 98 99 /** 100 * Sets a Camera to use for recording. Use this function to switch 101 * quickly between preview and capture mode without a teardown of 102 * the camera object. Must call before prepare(). 103 * 104 * @param c the Camera to use for recording 105 */ 106 public native void setCamera(Camera c); 107 108 /** 109 * Sets a Surface to show a preview of recorded media (video). Calls this 110 * before prepare() to make sure that the desirable preview display is 111 * set. 112 * 113 * @param sv the Surface to use for the preview 114 */ 115 public void setPreviewDisplay(Surface sv) { 116 mSurface = sv; 117 } 118 119 /** 120 * Defines the audio source. These constants are used with 121 * {@link MediaRecorder#setAudioSource(int)}. 122 */ 123 public final class AudioSource { 124 /* Do not change these values without updating their counterparts 125 * in include/media/mediarecorder.h! 126 */ 127 private AudioSource() {} 128 public static final int DEFAULT = 0; 129 /** Microphone audio source */ 130 public static final int MIC = 1; 131 132 /** Voice call uplink (Tx) audio source */ 133 public static final int VOICE_UPLINK = 2; 134 135 /** Voice call downlink (Rx) audio source */ 136 public static final int VOICE_DOWNLINK = 3; 137 138 /** Voice call uplink + downlink audio source */ 139 public static final int VOICE_CALL = 4; 140 141 /** Microphone audio source with same orientation as camera if available, the main 142 * device microphone otherwise */ 143 public static final int CAMCORDER = 5; 144 145 /** Microphone audio source tuned for voice recognition if available, behaves like 146 * {@link #DEFAULT} otherwise. */ 147 public static final int VOICE_RECOGNITION = 6; 148 } 149 150 /** 151 * Defines the video source. These constants are used with 152 * {@link MediaRecorder#setVideoSource(int)}. 153 */ 154 public final class VideoSource { 155 /* Do not change these values without updating their counterparts 156 * in include/media/mediarecorder.h! 157 */ 158 private VideoSource() {} 159 public static final int DEFAULT = 0; 160 /** Camera video source */ 161 public static final int CAMERA = 1; 162 } 163 164 /** 165 * Defines the output format. These constants are used with 166 * {@link MediaRecorder#setOutputFormat(int)}. 167 */ 168 public final class OutputFormat { 169 /* Do not change these values without updating their counterparts 170 * in include/media/mediarecorder.h! 171 */ 172 private OutputFormat() {} 173 public static final int DEFAULT = 0; 174 /** 3GPP media file format*/ 175 public static final int THREE_GPP = 1; 176 /** MPEG4 media file format*/ 177 public static final int MPEG_4 = 2; 178 179 /** The following formats are audio only .aac or .amr formats **/ 180 /** @deprecated Deprecated in favor of AMR_NB */ 181 /** TODO: change link when AMR_NB is exposed. Deprecated in favor of MediaRecorder.OutputFormat.AMR_NB */ 182 public static final int RAW_AMR = 3; 183 /** @hide AMR NB file format */ 184 public static final int AMR_NB = 3; 185 /** @hide AMR WB file format */ 186 public static final int AMR_WB = 4; 187 /** @hide AAC ADIF file format */ 188 public static final int AAC_ADIF = 5; 189 /** @hide AAC ADTS file format */ 190 public static final int AAC_ADTS = 6; 191 }; 192 193 /** 194 * Defines the audio encoding. These constants are used with 195 * {@link MediaRecorder#setAudioEncoder(int)}. 196 */ 197 public final class AudioEncoder { 198 /* Do not change these values without updating their counterparts 199 * in include/media/mediarecorder.h! 200 */ 201 private AudioEncoder() {} 202 public static final int DEFAULT = 0; 203 /** AMR (Narrowband) audio codec */ 204 public static final int AMR_NB = 1; 205 /** @hide AMR (Wideband) audio codec */ 206 public static final int AMR_WB = 2; 207 /** @hide AAC audio codec */ 208 public static final int AAC = 3; 209 /** @hide enhanced AAC audio codec */ 210 public static final int AAC_PLUS = 4; 211 /** @hide enhanced AAC plus audio codec */ 212 public static final int EAAC_PLUS = 5; 213 } 214 215 /** 216 * Defines the video encoding. These constants are used with 217 * {@link MediaRecorder#setVideoEncoder(int)}. 218 */ 219 public final class VideoEncoder { 220 /* Do not change these values without updating their counterparts 221 * in include/media/mediarecorder.h! 222 */ 223 private VideoEncoder() {} 224 public static final int DEFAULT = 0; 225 public static final int H263 = 1; 226 public static final int H264 = 2; 227 public static final int MPEG_4_SP = 3; 228 } 229 230 /** 231 * Sets the audio source to be used for recording. If this method is not 232 * called, the output file will not contain an audio track. The source needs 233 * to be specified before setting recording-parameters or encoders. Call 234 * this only before setOutputFormat(). 235 * 236 * @param audio_source the audio source to use 237 * @throws IllegalStateException if it is called after setOutputFormat() 238 * @see android.media.MediaRecorder.AudioSource 239 */ 240 public native void setAudioSource(int audio_source) 241 throws IllegalStateException; 242 243 /** 244 * Gets the maximum value for audio sources. 245 * @see android.media.MediaRecorder.AudioSource 246 */ 247 public static final int getAudioSourceMax() { return AudioSource.VOICE_RECOGNITION; } 248 249 /** 250 * Sets the video source to be used for recording. If this method is not 251 * called, the output file will not contain an video track. The source needs 252 * to be specified before setting recording-parameters or encoders. Call 253 * this only before setOutputFormat(). 254 * 255 * @param video_source the video source to use 256 * @throws IllegalStateException if it is called after setOutputFormat() 257 * @see android.media.MediaRecorder.VideoSource 258 */ 259 public native void setVideoSource(int video_source) 260 throws IllegalStateException; 261 262 /** 263 * Uses the settings from a CamcorderProfile object for recording. This method should 264 * be called after the video AND audio sources are set, and before setOutputFile(). 265 * 266 * @param profile the CamcorderProfile to use 267 * @see android.media.CamcorderProfile 268 */ 269 public void setProfile(CamcorderProfile profile) { 270 setOutputFormat(profile.fileFormat); 271 setVideoFrameRate(profile.videoFrameRate); 272 setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight); 273 setVideoEncodingBitRate(profile.videoBitRate); 274 setAudioEncodingBitRate(profile.audioBitRate); 275 setAudioChannels(profile.audioChannels); 276 setAudioSamplingRate(profile.audioSampleRate); 277 setVideoEncoder(profile.videoCodec); 278 setAudioEncoder(profile.audioCodec); 279 } 280 281 /** 282 * Sets the format of the output file produced during recording. Call this 283 * after setAudioSource()/setVideoSource() but before prepare(). 284 * 285 * <p>It is recommended to always use 3GP format when using the H.263 286 * video encoder and AMR audio encoder. Using an MPEG-4 container format 287 * may confuse some desktop players.</p> 288 * 289 * @param output_format the output format to use. The output format 290 * needs to be specified before setting recording-parameters or encoders. 291 * @throws IllegalStateException if it is called after prepare() or before 292 * setAudioSource()/setVideoSource(). 293 * @see android.media.MediaRecorder.OutputFormat 294 */ 295 public native void setOutputFormat(int output_format) 296 throws IllegalStateException; 297 298 /** 299 * Sets the width and height of the video to be captured. Must be called 300 * after setVideoSource(). Call this after setOutFormat() but before 301 * prepare(). 302 * 303 * @param width the width of the video to be captured 304 * @param height the height of the video to be captured 305 * @throws IllegalStateException if it is called after 306 * prepare() or before setOutputFormat() 307 */ 308 public native void setVideoSize(int width, int height) 309 throws IllegalStateException; 310 311 /** 312 * Sets the frame rate of the video to be captured. Must be called 313 * after setVideoSource(). Call this after setOutFormat() but before 314 * prepare(). 315 * 316 * @param rate the number of frames per second of video to capture 317 * @throws IllegalStateException if it is called after 318 * prepare() or before setOutputFormat(). 319 * 320 * NOTE: On some devices that have auto-frame rate, this sets the 321 * maximum frame rate, not a constant frame rate. Actual frame rate 322 * will vary according to lighting conditions. 323 */ 324 public native void setVideoFrameRate(int rate) throws IllegalStateException; 325 326 /** 327 * Sets the maximum duration (in ms) of the recording session. 328 * Call this after setOutFormat() but before prepare(). 329 * After recording reaches the specified duration, a notification 330 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 331 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 332 * and recording will be stopped. Stopping happens asynchronously, there 333 * is no guarantee that the recorder will have stopped by the time the 334 * listener is notified. 335 * 336 * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 337 * 338 */ 339 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 340 341 /** 342 * Sets the maximum filesize (in bytes) of the recording session. 343 * Call this after setOutFormat() but before prepare(). 344 * After recording reaches the specified filesize, a notification 345 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 346 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 347 * and recording will be stopped. Stopping happens asynchronously, there 348 * is no guarantee that the recorder will have stopped by the time the 349 * listener is notified. 350 * 351 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 352 * 353 */ 354 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 355 356 /** 357 * Sets the audio encoder to be used for recording. If this method is not 358 * called, the output file will not contain an audio track. Call this after 359 * setOutputFormat() but before prepare(). 360 * 361 * @param audio_encoder the audio encoder to use. 362 * @throws IllegalStateException if it is called before 363 * setOutputFormat() or after prepare(). 364 * @see android.media.MediaRecorder.AudioEncoder 365 */ 366 public native void setAudioEncoder(int audio_encoder) 367 throws IllegalStateException; 368 369 /** 370 * Sets the video encoder to be used for recording. If this method is not 371 * called, the output file will not contain an video track. Call this after 372 * setOutputFormat() and before prepare(). 373 * 374 * @param video_encoder the video encoder to use. 375 * @throws IllegalStateException if it is called before 376 * setOutputFormat() or after prepare() 377 * @see android.media.MediaRecorder.VideoEncoder 378 */ 379 public native void setVideoEncoder(int video_encoder) 380 throws IllegalStateException; 381 382 /** 383 * Sets the audio sampling rate for recording. Call this method before prepare(). 384 * Prepare() may perform additional checks on the parameter to make sure whether 385 * the specified audio sampling rate is applicable. The sampling rate really depends 386 * on the format for the audio recording, as well as the capabilities of the platform. 387 * For instance, the sampling rate supported by AAC audio coding standard ranges 388 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 389 * supported audio sampling rate. 390 * 391 * @param samplingRate the sampling rate for audio in samples per second. 392 */ 393 public void setAudioSamplingRate(int samplingRate) { 394 if (samplingRate <= 0) { 395 throw new IllegalArgumentException("Audio sampling rate is not positive"); 396 } 397 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 398 } 399 400 /** 401 * Sets the number of audio channels for recording. Call this method before prepare(). 402 * Prepare() may perform additional checks on the parameter to make sure whether the 403 * specified number of audio channels are applicable. 404 * 405 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 406 * (stereo). 407 */ 408 public void setAudioChannels(int numChannels) { 409 if (numChannels <= 0) { 410 throw new IllegalArgumentException("Number of channels is not positive"); 411 } 412 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 413 } 414 415 /** 416 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 417 * Prepare() may perform additional checks on the parameter to make sure whether the 418 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 419 * internally to ensure the audio recording can proceed smoothly based on the 420 * capabilities of the platform. 421 * 422 * @param bitRate the audio encoding bit rate in bits per second. 423 */ 424 public void setAudioEncodingBitRate(int bitRate) { 425 if (bitRate <= 0) { 426 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 427 } 428 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 429 } 430 431 /** 432 * Sets the video encoding bit rate for recording. Call this method before prepare(). 433 * Prepare() may perform additional checks on the parameter to make sure whether the 434 * specified bit rate is applicable, and sometimes the passed bitRate will be 435 * clipped internally to ensure the video recording can proceed smoothly based on 436 * the capabilities of the platform. 437 * 438 * @param bitRate the video encoding bit rate in bits per second. 439 */ 440 public void setVideoEncodingBitRate(int bitRate) { 441 if (bitRate <= 0) { 442 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 443 } 444 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 445 } 446 447 /** 448 * Pass in the file descriptor of the file to be written. Call this after 449 * setOutputFormat() but before prepare(). 450 * 451 * @param fd an open file descriptor to be written into. 452 * @throws IllegalStateException if it is called before 453 * setOutputFormat() or after prepare() 454 */ 455 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 456 { 457 mPath = null; 458 mFd = fd; 459 } 460 461 /** 462 * Sets the path of the output file to be produced. Call this after 463 * setOutputFormat() but before prepare(). 464 * 465 * @param path The pathname to use. 466 * @throws IllegalStateException if it is called before 467 * setOutputFormat() or after prepare() 468 */ 469 public void setOutputFile(String path) throws IllegalStateException 470 { 471 mFd = null; 472 mPath = path; 473 } 474 475 // native implementation 476 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 477 throws IllegalStateException, IOException; 478 private native void _prepare() throws IllegalStateException, IOException; 479 480 /** 481 * Prepares the recorder to begin capturing and encoding data. This method 482 * must be called after setting up the desired audio and video sources, 483 * encoders, file format, etc., but before start(). 484 * 485 * @throws IllegalStateException if it is called after 486 * start() or before setOutputFormat(). 487 * @throws IOException if prepare fails otherwise. 488 */ 489 public void prepare() throws IllegalStateException, IOException 490 { 491 if (mPath != null) { 492 FileOutputStream fos = new FileOutputStream(mPath); 493 try { 494 _setOutputFile(fos.getFD(), 0, 0); 495 } finally { 496 fos.close(); 497 } 498 } else if (mFd != null) { 499 _setOutputFile(mFd, 0, 0); 500 } else { 501 throw new IOException("No valid output file"); 502 } 503 _prepare(); 504 } 505 506 /** 507 * Begins capturing and encoding data to the file specified with 508 * setOutputFile(). Call this after prepare(). 509 * 510 * @throws IllegalStateException if it is called before 511 * prepare(). 512 */ 513 public native void start() throws IllegalStateException; 514 515 /** 516 * Stops recording. Call this after start(). Once recording is stopped, 517 * you will have to configure it again as if it has just been constructed. 518 * 519 * @throws IllegalStateException if it is called before start() 520 */ 521 public native void stop() throws IllegalStateException; 522 523 /** 524 * Restarts the MediaRecorder to its idle state. After calling 525 * this method, you will have to configure it again as if it had just been 526 * constructed. 527 */ 528 public void reset() { 529 native_reset(); 530 531 // make sure none of the listeners get called anymore 532 mEventHandler.removeCallbacksAndMessages(null); 533 } 534 535 private native void native_reset(); 536 537 /** 538 * Returns the maximum absolute amplitude that was sampled since the last 539 * call to this method. Call this only after the setAudioSource(). 540 * 541 * @return the maximum absolute amplitude measured since the last call, or 542 * 0 when called for the first time 543 * @throws IllegalStateException if it is called before 544 * the audio source has been set. 545 */ 546 public native int getMaxAmplitude() throws IllegalStateException; 547 548 /* Do not change this value without updating its counterpart 549 * in include/media/mediarecorder.h! 550 */ 551 /** Unspecified media recorder error. 552 * @see android.media.MediaRecorder.OnErrorListener 553 */ 554 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 555 556 /** 557 * Interface definition for a callback to be invoked when an error 558 * occurs while recording. 559 */ 560 public interface OnErrorListener 561 { 562 /** 563 * Called when an error occurs while recording. 564 * 565 * @param mr the MediaRecorder that encountered the error 566 * @param what the type of error that has occurred: 567 * <ul> 568 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 569 * </ul> 570 * @param extra an extra code, specific to the error type 571 */ 572 void onError(MediaRecorder mr, int what, int extra); 573 } 574 575 /** 576 * Register a callback to be invoked when an error occurs while 577 * recording. 578 * 579 * @param l the callback that will be run 580 */ 581 public void setOnErrorListener(OnErrorListener l) 582 { 583 mOnErrorListener = l; 584 } 585 586 /* Do not change these values without updating their counterparts 587 * in include/media/mediarecorder.h! 588 */ 589 /** Unspecified media recorder error. 590 * @see android.media.MediaRecorder.OnInfoListener 591 */ 592 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 593 /** A maximum duration had been setup and has now been reached. 594 * @see android.media.MediaRecorder.OnInfoListener 595 */ 596 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 597 /** A maximum filesize had been setup and has now been reached. 598 * @see android.media.MediaRecorder.OnInfoListener 599 */ 600 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 601 602 /** 603 * Interface definition for a callback to be invoked when an error 604 * occurs while recording. 605 */ 606 public interface OnInfoListener 607 { 608 /** 609 * Called when an error occurs while recording. 610 * 611 * @param mr the MediaRecorder that encountered the error 612 * @param what the type of error that has occurred: 613 * <ul> 614 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 615 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 616 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 617 * </ul> 618 * @param extra an extra code, specific to the error type 619 */ 620 void onInfo(MediaRecorder mr, int what, int extra); 621 } 622 623 /** 624 * Register a callback to be invoked when an informational event occurs while 625 * recording. 626 * 627 * @param listener the callback that will be run 628 */ 629 public void setOnInfoListener(OnInfoListener listener) 630 { 631 mOnInfoListener = listener; 632 } 633 634 private class EventHandler extends Handler 635 { 636 private MediaRecorder mMediaRecorder; 637 638 public EventHandler(MediaRecorder mr, Looper looper) { 639 super(looper); 640 mMediaRecorder = mr; 641 } 642 643 /* Do not change these values without updating their counterparts 644 * in include/media/mediarecorder.h! 645 */ 646 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 647 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 648 649 @Override 650 public void handleMessage(Message msg) { 651 if (mMediaRecorder.mNativeContext == 0) { 652 Log.w(TAG, "mediarecorder went away with unhandled events"); 653 return; 654 } 655 switch(msg.what) { 656 case MEDIA_RECORDER_EVENT_ERROR: 657 if (mOnErrorListener != null) 658 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 659 660 return; 661 662 case MEDIA_RECORDER_EVENT_INFO: 663 if (mOnInfoListener != null) 664 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 665 666 return; 667 668 default: 669 Log.e(TAG, "Unknown message type " + msg.what); 670 return; 671 } 672 } 673 } 674 675 /** 676 * Called from native code when an interesting event happens. This method 677 * just uses the EventHandler system to post the event back to the main app thread. 678 * We use a weak reference to the original MediaRecorder object so that the native 679 * code is safe from the object disappearing from underneath it. (This is 680 * the cookie passed to native_setup().) 681 */ 682 private static void postEventFromNative(Object mediarecorder_ref, 683 int what, int arg1, int arg2, Object obj) 684 { 685 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 686 if (mr == null) { 687 return; 688 } 689 690 if (mr.mEventHandler != null) { 691 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 692 mr.mEventHandler.sendMessage(m); 693 } 694 } 695 696 /** 697 * Releases resources associated with this MediaRecorder object. 698 * It is good practice to call this method when you're done 699 * using the MediaRecorder. 700 */ 701 public native void release(); 702 703 private static native final void native_init(); 704 705 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 706 707 private native final void native_finalize(); 708 709 private native void setParameter(String nameValuePair); 710 711 @Override 712 protected void finalize() { native_finalize(); } 713} 714