MediaRecorder.java revision d01371bf691ff04e4957e49805503dbf20b338df
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 timeBetweenTimeLapseFrameCaptureMs time between two captures of time lapse frames. 287 * @param encoderLevel the video encoder level. 288 */ 289 public void setTimeLapseParameters(boolean enableTimeLapse, 290 int timeBetweenTimeLapseFrameCaptureMs, int encoderLevel) { 291 setParameter(String.format("time-lapse-enable=%d", 292 (enableTimeLapse) ? 1 : 0)); 293 setParameter(String.format("time-between-time-lapse-frame-capture=%d", 294 timeBetweenTimeLapseFrameCaptureMs)); 295 setVideoEncoderLevel(encoderLevel); 296 } 297 298 /** 299 * Sets the format of the output file produced during recording. Call this 300 * after setAudioSource()/setVideoSource() but before prepare(). 301 * 302 * <p>It is recommended to always use 3GP format when using the H.263 303 * video encoder and AMR audio encoder. Using an MPEG-4 container format 304 * may confuse some desktop players.</p> 305 * 306 * @param output_format the output format to use. The output format 307 * needs to be specified before setting recording-parameters or encoders. 308 * @throws IllegalStateException if it is called after prepare() or before 309 * setAudioSource()/setVideoSource(). 310 * @see android.media.MediaRecorder.OutputFormat 311 */ 312 public native void setOutputFormat(int output_format) 313 throws IllegalStateException; 314 315 /** 316 * Sets the width and height of the video to be captured. Must be called 317 * after setVideoSource(). Call this after setOutFormat() but before 318 * prepare(). 319 * 320 * @param width the width of the video to be captured 321 * @param height the height of the video to be captured 322 * @throws IllegalStateException if it is called after 323 * prepare() or before setOutputFormat() 324 */ 325 public native void setVideoSize(int width, int height) 326 throws IllegalStateException; 327 328 /** 329 * Sets the frame rate of the video to be captured. Must be called 330 * after setVideoSource(). Call this after setOutFormat() but before 331 * prepare(). 332 * 333 * @param rate the number of frames per second of video to capture 334 * @throws IllegalStateException if it is called after 335 * prepare() or before setOutputFormat(). 336 * 337 * NOTE: On some devices that have auto-frame rate, this sets the 338 * maximum frame rate, not a constant frame rate. Actual frame rate 339 * will vary according to lighting conditions. 340 */ 341 public native void setVideoFrameRate(int rate) throws IllegalStateException; 342 343 /** 344 * Sets the maximum duration (in ms) of the recording session. 345 * Call this after setOutFormat() but before prepare(). 346 * After recording reaches the specified duration, a notification 347 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 348 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 349 * and recording will be stopped. Stopping happens asynchronously, there 350 * is no guarantee that the recorder will have stopped by the time the 351 * listener is notified. 352 * 353 * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 354 * 355 */ 356 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 357 358 /** 359 * Sets the maximum filesize (in bytes) of the recording session. 360 * Call this after setOutFormat() but before prepare(). 361 * After recording reaches the specified filesize, a notification 362 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 363 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 364 * and recording will be stopped. Stopping happens asynchronously, there 365 * is no guarantee that the recorder will have stopped by the time the 366 * listener is notified. 367 * 368 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 369 * 370 */ 371 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 372 373 /** 374 * Sets the audio encoder to be used for recording. If this method is not 375 * called, the output file will not contain an audio track. Call this after 376 * setOutputFormat() but before prepare(). 377 * 378 * @param audio_encoder the audio encoder to use. 379 * @throws IllegalStateException if it is called before 380 * setOutputFormat() or after prepare(). 381 * @see android.media.MediaRecorder.AudioEncoder 382 */ 383 public native void setAudioEncoder(int audio_encoder) 384 throws IllegalStateException; 385 386 /** 387 * Sets the video encoder to be used for recording. If this method is not 388 * called, the output file will not contain an video track. Call this after 389 * setOutputFormat() and before prepare(). 390 * 391 * @param video_encoder the video encoder to use. 392 * @throws IllegalStateException if it is called before 393 * setOutputFormat() or after prepare() 394 * @see android.media.MediaRecorder.VideoEncoder 395 */ 396 public native void setVideoEncoder(int video_encoder) 397 throws IllegalStateException; 398 399 /** 400 * Sets the audio sampling rate for recording. Call this method before prepare(). 401 * Prepare() may perform additional checks on the parameter to make sure whether 402 * the specified audio sampling rate is applicable. The sampling rate really depends 403 * on the format for the audio recording, as well as the capabilities of the platform. 404 * For instance, the sampling rate supported by AAC audio coding standard ranges 405 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 406 * supported audio sampling rate. 407 * 408 * @param samplingRate the sampling rate for audio in samples per second. 409 */ 410 public void setAudioSamplingRate(int samplingRate) { 411 if (samplingRate <= 0) { 412 throw new IllegalArgumentException("Audio sampling rate is not positive"); 413 } 414 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 415 } 416 417 /** 418 * Sets the number of audio channels for recording. Call this method before prepare(). 419 * Prepare() may perform additional checks on the parameter to make sure whether the 420 * specified number of audio channels are applicable. 421 * 422 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 423 * (stereo). 424 */ 425 public void setAudioChannels(int numChannels) { 426 if (numChannels <= 0) { 427 throw new IllegalArgumentException("Number of channels is not positive"); 428 } 429 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 430 } 431 432 /** 433 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 434 * Prepare() may perform additional checks on the parameter to make sure whether the 435 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 436 * internally to ensure the audio recording can proceed smoothly based on the 437 * capabilities of the platform. 438 * 439 * @param bitRate the audio encoding bit rate in bits per second. 440 */ 441 public void setAudioEncodingBitRate(int bitRate) { 442 if (bitRate <= 0) { 443 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 444 } 445 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 446 } 447 448 /** 449 * Sets the video encoding bit rate for recording. Call this method before prepare(). 450 * Prepare() may perform additional checks on the parameter to make sure whether the 451 * specified bit rate is applicable, and sometimes the passed bitRate will be 452 * clipped internally to ensure the video recording can proceed smoothly based on 453 * the capabilities of the platform. 454 * 455 * @param bitRate the video encoding bit rate in bits per second. 456 */ 457 public void setVideoEncodingBitRate(int bitRate) { 458 if (bitRate <= 0) { 459 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 460 } 461 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 462 } 463 464 /** 465 * Sets the level of the encoder. Call this before prepare(). 466 * 467 * @param encoderLevel the video encoder level. 468 */ 469 public void setVideoEncoderLevel(int encoderLevel) { 470 setParameter(String.format("video-param-encoder-level=%d", encoderLevel)); 471 } 472 473 /** 474 * Pass in the file descriptor of the file to be written. Call this after 475 * setOutputFormat() but before prepare(). 476 * 477 * @param fd an open file descriptor to be written into. 478 * @throws IllegalStateException if it is called before 479 * setOutputFormat() or after prepare() 480 */ 481 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 482 { 483 mPath = null; 484 mFd = fd; 485 } 486 487 /** 488 * Sets the path of the output file to be produced. Call this after 489 * setOutputFormat() but before prepare(). 490 * 491 * @param path The pathname to use. 492 * @throws IllegalStateException if it is called before 493 * setOutputFormat() or after prepare() 494 */ 495 public void setOutputFile(String path) throws IllegalStateException 496 { 497 mFd = null; 498 mPath = path; 499 } 500 501 // native implementation 502 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 503 throws IllegalStateException, IOException; 504 private native void _prepare() throws IllegalStateException, IOException; 505 506 /** 507 * Prepares the recorder to begin capturing and encoding data. This method 508 * must be called after setting up the desired audio and video sources, 509 * encoders, file format, etc., but before start(). 510 * 511 * @throws IllegalStateException if it is called after 512 * start() or before setOutputFormat(). 513 * @throws IOException if prepare fails otherwise. 514 */ 515 public void prepare() throws IllegalStateException, IOException 516 { 517 if (mPath != null) { 518 FileOutputStream fos = new FileOutputStream(mPath); 519 try { 520 _setOutputFile(fos.getFD(), 0, 0); 521 } finally { 522 fos.close(); 523 } 524 } else if (mFd != null) { 525 _setOutputFile(mFd, 0, 0); 526 } else { 527 throw new IOException("No valid output file"); 528 } 529 _prepare(); 530 } 531 532 /** 533 * Begins capturing and encoding data to the file specified with 534 * setOutputFile(). Call this after prepare(). 535 * 536 * @throws IllegalStateException if it is called before 537 * prepare(). 538 */ 539 public native void start() throws IllegalStateException; 540 541 /** 542 * Stops recording. Call this after start(). Once recording is stopped, 543 * you will have to configure it again as if it has just been constructed. 544 * 545 * @throws IllegalStateException if it is called before start() 546 */ 547 public native void stop() throws IllegalStateException; 548 549 /** 550 * Restarts the MediaRecorder to its idle state. After calling 551 * this method, you will have to configure it again as if it had just been 552 * constructed. 553 */ 554 public void reset() { 555 native_reset(); 556 557 // make sure none of the listeners get called anymore 558 mEventHandler.removeCallbacksAndMessages(null); 559 } 560 561 private native void native_reset(); 562 563 /** 564 * Returns the maximum absolute amplitude that was sampled since the last 565 * call to this method. Call this only after the setAudioSource(). 566 * 567 * @return the maximum absolute amplitude measured since the last call, or 568 * 0 when called for the first time 569 * @throws IllegalStateException if it is called before 570 * the audio source has been set. 571 */ 572 public native int getMaxAmplitude() throws IllegalStateException; 573 574 /* Do not change this value without updating its counterpart 575 * in include/media/mediarecorder.h! 576 */ 577 /** Unspecified media recorder error. 578 * @see android.media.MediaRecorder.OnErrorListener 579 */ 580 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 581 582 /** 583 * Interface definition for a callback to be invoked when an error 584 * occurs while recording. 585 */ 586 public interface OnErrorListener 587 { 588 /** 589 * Called when an error occurs while recording. 590 * 591 * @param mr the MediaRecorder that encountered the error 592 * @param what the type of error that has occurred: 593 * <ul> 594 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 595 * </ul> 596 * @param extra an extra code, specific to the error type 597 */ 598 void onError(MediaRecorder mr, int what, int extra); 599 } 600 601 /** 602 * Register a callback to be invoked when an error occurs while 603 * recording. 604 * 605 * @param l the callback that will be run 606 */ 607 public void setOnErrorListener(OnErrorListener l) 608 { 609 mOnErrorListener = l; 610 } 611 612 /* Do not change these values without updating their counterparts 613 * in include/media/mediarecorder.h! 614 */ 615 /** Unspecified media recorder error. 616 * @see android.media.MediaRecorder.OnInfoListener 617 */ 618 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 619 /** A maximum duration had been setup and has now been reached. 620 * @see android.media.MediaRecorder.OnInfoListener 621 */ 622 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 623 /** A maximum filesize had been setup and has now been reached. 624 * @see android.media.MediaRecorder.OnInfoListener 625 */ 626 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 627 628 /** 629 * Interface definition for a callback to be invoked when an error 630 * occurs while recording. 631 */ 632 public interface OnInfoListener 633 { 634 /** 635 * Called when an error occurs while recording. 636 * 637 * @param mr the MediaRecorder that encountered the error 638 * @param what the type of error that has occurred: 639 * <ul> 640 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 641 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 642 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 643 * </ul> 644 * @param extra an extra code, specific to the error type 645 */ 646 void onInfo(MediaRecorder mr, int what, int extra); 647 } 648 649 /** 650 * Register a callback to be invoked when an informational event occurs while 651 * recording. 652 * 653 * @param listener the callback that will be run 654 */ 655 public void setOnInfoListener(OnInfoListener listener) 656 { 657 mOnInfoListener = listener; 658 } 659 660 private class EventHandler extends Handler 661 { 662 private MediaRecorder mMediaRecorder; 663 664 public EventHandler(MediaRecorder mr, Looper looper) { 665 super(looper); 666 mMediaRecorder = mr; 667 } 668 669 /* Do not change these values without updating their counterparts 670 * in include/media/mediarecorder.h! 671 */ 672 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 673 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 674 675 @Override 676 public void handleMessage(Message msg) { 677 if (mMediaRecorder.mNativeContext == 0) { 678 Log.w(TAG, "mediarecorder went away with unhandled events"); 679 return; 680 } 681 switch(msg.what) { 682 case MEDIA_RECORDER_EVENT_ERROR: 683 if (mOnErrorListener != null) 684 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 685 686 return; 687 688 case MEDIA_RECORDER_EVENT_INFO: 689 if (mOnInfoListener != null) 690 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 691 692 return; 693 694 default: 695 Log.e(TAG, "Unknown message type " + msg.what); 696 return; 697 } 698 } 699 } 700 701 /** 702 * Called from native code when an interesting event happens. This method 703 * just uses the EventHandler system to post the event back to the main app thread. 704 * We use a weak reference to the original MediaRecorder object so that the native 705 * code is safe from the object disappearing from underneath it. (This is 706 * the cookie passed to native_setup().) 707 */ 708 private static void postEventFromNative(Object mediarecorder_ref, 709 int what, int arg1, int arg2, Object obj) 710 { 711 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 712 if (mr == null) { 713 return; 714 } 715 716 if (mr.mEventHandler != null) { 717 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 718 mr.mEventHandler.sendMessage(m); 719 } 720 } 721 722 /** 723 * Releases resources associated with this MediaRecorder object. 724 * It is good practice to call this method when you're done 725 * using the MediaRecorder. 726 */ 727 public native void release(); 728 729 private static native final void native_init(); 730 731 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 732 733 private native final void native_finalize(); 734 735 private native void setParameter(String nameValuePair); 736 737 @Override 738 protected void finalize() { native_finalize(); } 739} 740