MediaRecorder.java revision bf3699a55853c4f1ccca7816945f83a1b80a4619
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 * Enables/Disables time lapse capture and sets its parameters. This method should 283 * be called after setProfile(). 284 * 285 * @param enableTimeLapse Pass true to enable time lapse capture, false to disable it. 286 * @param useStillCameraForTimeLapse Pass true to use still camera for capturing time lapse 287 * frames, false to use the video camera. 288 * @param timeBetweenTimeLapseFrameCaptureMs time between two captures of time lapse frames. 289 * @param encoderLevel the video encoder level. 290 */ 291 public void setTimeLapseParameters(boolean enableTimeLapse, 292 boolean useStillCameraForTimeLapse, 293 int timeBetweenTimeLapseFrameCaptureMs, int encoderLevel) { 294 setParameter(String.format("time-lapse-enable=%d", 295 (enableTimeLapse) ? 1 : 0)); 296 setParameter(String.format("use-still-camera-for-time-lapse=%d", 297 (useStillCameraForTimeLapse) ? 1 : 0)); 298 setParameter(String.format("time-between-time-lapse-frame-capture=%d", 299 timeBetweenTimeLapseFrameCaptureMs)); 300 setVideoEncoderLevel(encoderLevel); 301 } 302 303 /** 304 * Sets the format of the output file produced during recording. Call this 305 * after setAudioSource()/setVideoSource() but before prepare(). 306 * 307 * <p>It is recommended to always use 3GP format when using the H.263 308 * video encoder and AMR audio encoder. Using an MPEG-4 container format 309 * may confuse some desktop players.</p> 310 * 311 * @param output_format the output format to use. The output format 312 * needs to be specified before setting recording-parameters or encoders. 313 * @throws IllegalStateException if it is called after prepare() or before 314 * setAudioSource()/setVideoSource(). 315 * @see android.media.MediaRecorder.OutputFormat 316 */ 317 public native void setOutputFormat(int output_format) 318 throws IllegalStateException; 319 320 /** 321 * Sets the width and height of the video to be captured. Must be called 322 * after setVideoSource(). Call this after setOutFormat() but before 323 * prepare(). 324 * 325 * @param width the width of the video to be captured 326 * @param height the height of the video to be captured 327 * @throws IllegalStateException if it is called after 328 * prepare() or before setOutputFormat() 329 */ 330 public native void setVideoSize(int width, int height) 331 throws IllegalStateException; 332 333 /** 334 * Sets the frame rate of the video to be captured. Must be called 335 * after setVideoSource(). Call this after setOutFormat() but before 336 * prepare(). 337 * 338 * @param rate the number of frames per second of video to capture 339 * @throws IllegalStateException if it is called after 340 * prepare() or before setOutputFormat(). 341 * 342 * NOTE: On some devices that have auto-frame rate, this sets the 343 * maximum frame rate, not a constant frame rate. Actual frame rate 344 * will vary according to lighting conditions. 345 */ 346 public native void setVideoFrameRate(int rate) throws IllegalStateException; 347 348 /** 349 * Sets the maximum duration (in ms) of the recording session. 350 * Call this after setOutFormat() but before prepare(). 351 * After recording reaches the specified duration, a notification 352 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 353 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 354 * and recording will be stopped. Stopping happens asynchronously, there 355 * is no guarantee that the recorder will have stopped by the time the 356 * listener is notified. 357 * 358 * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 359 * 360 */ 361 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 362 363 /** 364 * Sets the maximum filesize (in bytes) of the recording session. 365 * Call this after setOutFormat() but before prepare(). 366 * After recording reaches the specified filesize, a notification 367 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 368 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 369 * and recording will be stopped. Stopping happens asynchronously, there 370 * is no guarantee that the recorder will have stopped by the time the 371 * listener is notified. 372 * 373 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 374 * 375 */ 376 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 377 378 /** 379 * Sets the audio encoder to be used for recording. If this method is not 380 * called, the output file will not contain an audio track. Call this after 381 * setOutputFormat() but before prepare(). 382 * 383 * @param audio_encoder the audio encoder to use. 384 * @throws IllegalStateException if it is called before 385 * setOutputFormat() or after prepare(). 386 * @see android.media.MediaRecorder.AudioEncoder 387 */ 388 public native void setAudioEncoder(int audio_encoder) 389 throws IllegalStateException; 390 391 /** 392 * Sets the video encoder to be used for recording. If this method is not 393 * called, the output file will not contain an video track. Call this after 394 * setOutputFormat() and before prepare(). 395 * 396 * @param video_encoder the video encoder to use. 397 * @throws IllegalStateException if it is called before 398 * setOutputFormat() or after prepare() 399 * @see android.media.MediaRecorder.VideoEncoder 400 */ 401 public native void setVideoEncoder(int video_encoder) 402 throws IllegalStateException; 403 404 /** 405 * Sets the audio sampling rate for recording. Call this method before prepare(). 406 * Prepare() may perform additional checks on the parameter to make sure whether 407 * the specified audio sampling rate is applicable. The sampling rate really depends 408 * on the format for the audio recording, as well as the capabilities of the platform. 409 * For instance, the sampling rate supported by AAC audio coding standard ranges 410 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 411 * supported audio sampling rate. 412 * 413 * @param samplingRate the sampling rate for audio in samples per second. 414 */ 415 public void setAudioSamplingRate(int samplingRate) { 416 if (samplingRate <= 0) { 417 throw new IllegalArgumentException("Audio sampling rate is not positive"); 418 } 419 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 420 } 421 422 /** 423 * Sets the number of audio channels for recording. Call this method before prepare(). 424 * Prepare() may perform additional checks on the parameter to make sure whether the 425 * specified number of audio channels are applicable. 426 * 427 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 428 * (stereo). 429 */ 430 public void setAudioChannels(int numChannels) { 431 if (numChannels <= 0) { 432 throw new IllegalArgumentException("Number of channels is not positive"); 433 } 434 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 435 } 436 437 /** 438 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 439 * Prepare() may perform additional checks on the parameter to make sure whether the 440 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 441 * internally to ensure the audio recording can proceed smoothly based on the 442 * capabilities of the platform. 443 * 444 * @param bitRate the audio encoding bit rate in bits per second. 445 */ 446 public void setAudioEncodingBitRate(int bitRate) { 447 if (bitRate <= 0) { 448 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 449 } 450 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 451 } 452 453 /** 454 * Sets the video encoding bit rate for recording. Call this method before prepare(). 455 * Prepare() may perform additional checks on the parameter to make sure whether the 456 * specified bit rate is applicable, and sometimes the passed bitRate will be 457 * clipped internally to ensure the video recording can proceed smoothly based on 458 * the capabilities of the platform. 459 * 460 * @param bitRate the video encoding bit rate in bits per second. 461 */ 462 public void setVideoEncodingBitRate(int bitRate) { 463 if (bitRate <= 0) { 464 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 465 } 466 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 467 } 468 469 /** 470 * Sets the level of the encoder. Call this before prepare(). 471 * 472 * @param encoderLevel the video encoder level. 473 * @hide 474 */ 475 public void setVideoEncoderLevel(int encoderLevel) { 476 setParameter(String.format("video-param-encoder-level=%d", encoderLevel)); 477 } 478 479 /** 480 * Pass in the file descriptor of the file to be written. Call this after 481 * setOutputFormat() but before prepare(). 482 * 483 * @param fd an open file descriptor to be written into. 484 * @throws IllegalStateException if it is called before 485 * setOutputFormat() or after prepare() 486 */ 487 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 488 { 489 mPath = null; 490 mFd = fd; 491 } 492 493 /** 494 * Sets the path of the output file to be produced. Call this after 495 * setOutputFormat() but before prepare(). 496 * 497 * @param path The pathname to use. 498 * @throws IllegalStateException if it is called before 499 * setOutputFormat() or after prepare() 500 */ 501 public void setOutputFile(String path) throws IllegalStateException 502 { 503 mFd = null; 504 mPath = path; 505 } 506 507 // native implementation 508 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 509 throws IllegalStateException, IOException; 510 private native void _prepare() throws IllegalStateException, IOException; 511 512 /** 513 * Prepares the recorder to begin capturing and encoding data. This method 514 * must be called after setting up the desired audio and video sources, 515 * encoders, file format, etc., but before start(). 516 * 517 * @throws IllegalStateException if it is called after 518 * start() or before setOutputFormat(). 519 * @throws IOException if prepare fails otherwise. 520 */ 521 public void prepare() throws IllegalStateException, IOException 522 { 523 if (mPath != null) { 524 FileOutputStream fos = new FileOutputStream(mPath); 525 try { 526 _setOutputFile(fos.getFD(), 0, 0); 527 } finally { 528 fos.close(); 529 } 530 } else if (mFd != null) { 531 _setOutputFile(mFd, 0, 0); 532 } else { 533 throw new IOException("No valid output file"); 534 } 535 _prepare(); 536 } 537 538 /** 539 * Begins capturing and encoding data to the file specified with 540 * setOutputFile(). Call this after prepare(). 541 * 542 * @throws IllegalStateException if it is called before 543 * prepare(). 544 */ 545 public native void start() throws IllegalStateException; 546 547 /** 548 * Stops recording. Call this after start(). Once recording is stopped, 549 * you will have to configure it again as if it has just been constructed. 550 * 551 * @throws IllegalStateException if it is called before start() 552 */ 553 public native void stop() throws IllegalStateException; 554 555 /** 556 * Restarts the MediaRecorder to its idle state. After calling 557 * this method, you will have to configure it again as if it had just been 558 * constructed. 559 */ 560 public void reset() { 561 native_reset(); 562 563 // make sure none of the listeners get called anymore 564 mEventHandler.removeCallbacksAndMessages(null); 565 } 566 567 private native void native_reset(); 568 569 /** 570 * Returns the maximum absolute amplitude that was sampled since the last 571 * call to this method. Call this only after the setAudioSource(). 572 * 573 * @return the maximum absolute amplitude measured since the last call, or 574 * 0 when called for the first time 575 * @throws IllegalStateException if it is called before 576 * the audio source has been set. 577 */ 578 public native int getMaxAmplitude() throws IllegalStateException; 579 580 /* Do not change this value without updating its counterpart 581 * in include/media/mediarecorder.h! 582 */ 583 /** Unspecified media recorder error. 584 * @see android.media.MediaRecorder.OnErrorListener 585 */ 586 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 587 588 /** 589 * Interface definition for a callback to be invoked when an error 590 * occurs while recording. 591 */ 592 public interface OnErrorListener 593 { 594 /** 595 * Called when an error occurs while recording. 596 * 597 * @param mr the MediaRecorder that encountered the error 598 * @param what the type of error that has occurred: 599 * <ul> 600 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 601 * </ul> 602 * @param extra an extra code, specific to the error type 603 */ 604 void onError(MediaRecorder mr, int what, int extra); 605 } 606 607 /** 608 * Register a callback to be invoked when an error occurs while 609 * recording. 610 * 611 * @param l the callback that will be run 612 */ 613 public void setOnErrorListener(OnErrorListener l) 614 { 615 mOnErrorListener = l; 616 } 617 618 /* Do not change these values without updating their counterparts 619 * in include/media/mediarecorder.h! 620 */ 621 /** Unspecified media recorder error. 622 * @see android.media.MediaRecorder.OnInfoListener 623 */ 624 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 625 /** A maximum duration had been setup and has now been reached. 626 * @see android.media.MediaRecorder.OnInfoListener 627 */ 628 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 629 /** A maximum filesize had been setup and has now been reached. 630 * @see android.media.MediaRecorder.OnInfoListener 631 */ 632 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 633 634 /** 635 * Interface definition for a callback to be invoked when an error 636 * occurs while recording. 637 */ 638 public interface OnInfoListener 639 { 640 /** 641 * Called when an error occurs while recording. 642 * 643 * @param mr the MediaRecorder that encountered the error 644 * @param what the type of error that has occurred: 645 * <ul> 646 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 647 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 648 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 649 * </ul> 650 * @param extra an extra code, specific to the error type 651 */ 652 void onInfo(MediaRecorder mr, int what, int extra); 653 } 654 655 /** 656 * Register a callback to be invoked when an informational event occurs while 657 * recording. 658 * 659 * @param listener the callback that will be run 660 */ 661 public void setOnInfoListener(OnInfoListener listener) 662 { 663 mOnInfoListener = listener; 664 } 665 666 private class EventHandler extends Handler 667 { 668 private MediaRecorder mMediaRecorder; 669 670 public EventHandler(MediaRecorder mr, Looper looper) { 671 super(looper); 672 mMediaRecorder = mr; 673 } 674 675 /* Do not change these values without updating their counterparts 676 * in include/media/mediarecorder.h! 677 */ 678 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 679 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 680 681 @Override 682 public void handleMessage(Message msg) { 683 if (mMediaRecorder.mNativeContext == 0) { 684 Log.w(TAG, "mediarecorder went away with unhandled events"); 685 return; 686 } 687 switch(msg.what) { 688 case MEDIA_RECORDER_EVENT_ERROR: 689 if (mOnErrorListener != null) 690 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 691 692 return; 693 694 case MEDIA_RECORDER_EVENT_INFO: 695 if (mOnInfoListener != null) 696 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 697 698 return; 699 700 default: 701 Log.e(TAG, "Unknown message type " + msg.what); 702 return; 703 } 704 } 705 } 706 707 /** 708 * Called from native code when an interesting event happens. This method 709 * just uses the EventHandler system to post the event back to the main app thread. 710 * We use a weak reference to the original MediaRecorder object so that the native 711 * code is safe from the object disappearing from underneath it. (This is 712 * the cookie passed to native_setup().) 713 */ 714 private static void postEventFromNative(Object mediarecorder_ref, 715 int what, int arg1, int arg2, Object obj) 716 { 717 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 718 if (mr == null) { 719 return; 720 } 721 722 if (mr.mEventHandler != null) { 723 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 724 mr.mEventHandler.sendMessage(m); 725 } 726 } 727 728 /** 729 * Releases resources associated with this MediaRecorder object. 730 * It is good practice to call this method when you're done 731 * using the MediaRecorder. 732 */ 733 public native void release(); 734 735 private static native final void native_init(); 736 737 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 738 739 private native final void native_finalize(); 740 741 private native void setParameter(String nameValuePair); 742 743 @Override 744 protected void finalize() { native_finalize(); } 745} 746