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 17 package android.media; 18 19 import android.media.CamcorderProfile; 20 import android.hardware.Camera; 21 import android.os.Handler; 22 import android.os.Looper; 23 import android.os.Message; 24 import android.util.Log; 25 import android.view.Surface; 26 import java.io.IOException; 27 import java.io.FileNotFoundException; 28 import java.io.FileOutputStream; 29 import java.io.FileDescriptor; 30 import 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 */ 58 public 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 * @hide 151 * Microphone audio source tuned for voice communications such as VoIP. It 152 * will for instance take advantage of echo cancellation or automatic gain control 153 * if available. It otherwise behaves like {@link #DEFAULT} if no voice processing 154 * is available. 155 */ 156 public static final int VOICE_COMMUNICATION = 7; 157 } 158 159 /** 160 * Defines the video source. These constants are used with 161 * {@link MediaRecorder#setVideoSource(int)}. 162 */ 163 public final class VideoSource { 164 /* Do not change these values without updating their counterparts 165 * in include/media/mediarecorder.h! 166 */ 167 private VideoSource() {} 168 public static final int DEFAULT = 0; 169 /** Camera video source */ 170 public static final int CAMERA = 1; 171 } 172 173 /** 174 * Defines the output format. These constants are used with 175 * {@link MediaRecorder#setOutputFormat(int)}. 176 */ 177 public final class OutputFormat { 178 /* Do not change these values without updating their counterparts 179 * in include/media/mediarecorder.h! 180 */ 181 private OutputFormat() {} 182 public static final int DEFAULT = 0; 183 /** 3GPP media file format*/ 184 public static final int THREE_GPP = 1; 185 /** MPEG4 media file format*/ 186 public static final int MPEG_4 = 2; 187 188 /** The following formats are audio only .aac or .amr formats **/ 189 /** @deprecated Deprecated in favor of AMR_NB */ 190 /** Deprecated in favor of MediaRecorder.OutputFormat.AMR_NB */ 191 /** AMR NB file format */ 192 public static final int RAW_AMR = 3; 193 /** AMR NB file format */ 194 public static final int AMR_NB = 3; 195 /** AMR WB file format */ 196 public static final int AMR_WB = 4; 197 /** @hide AAC ADIF file format */ 198 public static final int AAC_ADIF = 5; 199 /** @hide AAC ADTS file format */ 200 public static final int AAC_ADTS = 6; 201 202 /** @hide Stream over a socket, limited to a single stream */ 203 public static final int OUTPUT_FORMAT_RTP_AVP = 7; 204 205 /** @hide H.264/AAC data encapsulated in MPEG2/TS */ 206 public static final int OUTPUT_FORMAT_MPEG2TS = 8; 207 }; 208 209 /** 210 * Defines the audio encoding. These constants are used with 211 * {@link MediaRecorder#setAudioEncoder(int)}. 212 */ 213 public final class AudioEncoder { 214 /* Do not change these values without updating their counterparts 215 * in include/media/mediarecorder.h! 216 */ 217 private AudioEncoder() {} 218 public static final int DEFAULT = 0; 219 /** AMR (Narrowband) audio codec */ 220 public static final int AMR_NB = 1; 221 /** AMR (Wideband) audio codec */ 222 public static final int AMR_WB = 2; 223 /** AAC audio codec */ 224 public static final int AAC = 3; 225 /** @hide enhanced AAC audio codec */ 226 public static final int AAC_PLUS = 4; 227 /** @hide enhanced AAC plus audio codec */ 228 public static final int EAAC_PLUS = 5; 229 } 230 231 /** 232 * Defines the video encoding. These constants are used with 233 * {@link MediaRecorder#setVideoEncoder(int)}. 234 */ 235 public final class VideoEncoder { 236 /* Do not change these values without updating their counterparts 237 * in include/media/mediarecorder.h! 238 */ 239 private VideoEncoder() {} 240 public static final int DEFAULT = 0; 241 public static final int H263 = 1; 242 public static final int H264 = 2; 243 public static final int MPEG_4_SP = 3; 244 } 245 246 /** 247 * Sets the audio source to be used for recording. If this method is not 248 * called, the output file will not contain an audio track. The source needs 249 * to be specified before setting recording-parameters or encoders. Call 250 * this only before setOutputFormat(). 251 * 252 * @param audio_source the audio source to use 253 * @throws IllegalStateException if it is called after setOutputFormat() 254 * @see android.media.MediaRecorder.AudioSource 255 */ 256 public native void setAudioSource(int audio_source) 257 throws IllegalStateException; 258 259 /** 260 * Gets the maximum value for audio sources. 261 * @see android.media.MediaRecorder.AudioSource 262 */ 263 public static final int getAudioSourceMax() { return AudioSource.VOICE_RECOGNITION; } 264 265 /** 266 * Sets the video source to be used for recording. If this method is not 267 * called, the output file will not contain an video track. The source needs 268 * to be specified before setting recording-parameters or encoders. Call 269 * this only before setOutputFormat(). 270 * 271 * @param video_source the video source to use 272 * @throws IllegalStateException if it is called after setOutputFormat() 273 * @see android.media.MediaRecorder.VideoSource 274 */ 275 public native void setVideoSource(int video_source) 276 throws IllegalStateException; 277 278 /** 279 * Uses the settings from a CamcorderProfile object for recording. This method should 280 * be called after the video AND audio sources are set, and before setOutputFile(). 281 * 282 * @param profile the CamcorderProfile to use 283 * @see android.media.CamcorderProfile 284 */ 285 public void setProfile(CamcorderProfile profile) { 286 setOutputFormat(profile.fileFormat); 287 setVideoFrameRate(profile.videoFrameRate); 288 setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight); 289 setVideoEncodingBitRate(profile.videoBitRate); 290 setAudioEncodingBitRate(profile.audioBitRate); 291 setAudioChannels(profile.audioChannels); 292 setAudioSamplingRate(profile.audioSampleRate); 293 setVideoEncoder(profile.videoCodec); 294 setAudioEncoder(profile.audioCodec); 295 } 296 297 /** 298 * Sets the orientation hint for output video playback. 299 * This method should be called before prepare(). This method will not 300 * trigger the source video frame to rotate during video recording, but to 301 * add a composition matrix containing the rotation angle in the output 302 * video if the output format is OutputFormat.THREE_GPP or 303 * OutputFormat.MPEG_4 so that a video player can choose the proper 304 * orientation for playback. Note that some video players may choose 305 * to ignore the compostion matrix in a video during playback. 306 * 307 * @param degrees the angle to be rotated clockwise in degrees. 308 * The supported angles are 0, 90, 180, and 270 degrees. 309 * @throws IllegalArgumentException if the angle is not supported. 310 * 311 */ 312 public void setOrientationHint(int degrees) { 313 if (degrees != 0 && 314 degrees != 90 && 315 degrees != 180 && 316 degrees != 270) { 317 throw new IllegalArgumentException("Unsupported angle: " + degrees); 318 } 319 setParameter(String.format("video-param-rotation-angle-degrees=%d", degrees)); 320 } 321 322 /** 323 * Sets the format of the output file produced during recording. Call this 324 * after setAudioSource()/setVideoSource() but before prepare(). 325 * 326 * <p>It is recommended to always use 3GP format when using the H.263 327 * video encoder and AMR audio encoder. Using an MPEG-4 container format 328 * may confuse some desktop players.</p> 329 * 330 * @param output_format the output format to use. The output format 331 * needs to be specified before setting recording-parameters or encoders. 332 * @throws IllegalStateException if it is called after prepare() or before 333 * setAudioSource()/setVideoSource(). 334 * @see android.media.MediaRecorder.OutputFormat 335 */ 336 public native void setOutputFormat(int output_format) 337 throws IllegalStateException; 338 339 /** 340 * Sets the width and height of the video to be captured. Must be called 341 * after setVideoSource(). Call this after setOutFormat() but before 342 * prepare(). 343 * 344 * @param width the width of the video to be captured 345 * @param height the height of the video to be captured 346 * @throws IllegalStateException if it is called after 347 * prepare() or before setOutputFormat() 348 */ 349 public native void setVideoSize(int width, int height) 350 throws IllegalStateException; 351 352 /** 353 * Sets the frame rate of the video to be captured. Must be called 354 * after setVideoSource(). Call this after setOutFormat() but before 355 * prepare(). 356 * 357 * @param rate the number of frames per second of video to capture 358 * @throws IllegalStateException if it is called after 359 * prepare() or before setOutputFormat(). 360 * 361 * NOTE: On some devices that have auto-frame rate, this sets the 362 * maximum frame rate, not a constant frame rate. Actual frame rate 363 * will vary according to lighting conditions. 364 */ 365 public native void setVideoFrameRate(int rate) throws IllegalStateException; 366 367 /** 368 * Sets the maximum duration (in ms) of the recording session. 369 * Call this after setOutFormat() but before prepare(). 370 * After recording reaches the specified duration, a notification 371 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 372 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 373 * and recording will be stopped. Stopping happens asynchronously, there 374 * is no guarantee that the recorder will have stopped by the time the 375 * listener is notified. 376 * 377 * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 378 * 379 */ 380 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 381 382 /** 383 * Sets the maximum filesize (in bytes) of the recording session. 384 * Call this after setOutFormat() but before prepare(). 385 * After recording reaches the specified filesize, a notification 386 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 387 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 388 * and recording will be stopped. Stopping happens asynchronously, there 389 * is no guarantee that the recorder will have stopped by the time the 390 * listener is notified. 391 * 392 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 393 * 394 */ 395 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 396 397 /** 398 * Sets the audio encoder to be used for recording. If this method is not 399 * called, the output file will not contain an audio track. Call this after 400 * setOutputFormat() but before prepare(). 401 * 402 * @param audio_encoder the audio encoder to use. 403 * @throws IllegalStateException if it is called before 404 * setOutputFormat() or after prepare(). 405 * @see android.media.MediaRecorder.AudioEncoder 406 */ 407 public native void setAudioEncoder(int audio_encoder) 408 throws IllegalStateException; 409 410 /** 411 * Sets the video encoder to be used for recording. If this method is not 412 * called, the output file will not contain an video track. Call this after 413 * setOutputFormat() and before prepare(). 414 * 415 * @param video_encoder the video encoder to use. 416 * @throws IllegalStateException if it is called before 417 * setOutputFormat() or after prepare() 418 * @see android.media.MediaRecorder.VideoEncoder 419 */ 420 public native void setVideoEncoder(int video_encoder) 421 throws IllegalStateException; 422 423 /** 424 * Sets the audio sampling rate for recording. Call this method before prepare(). 425 * Prepare() may perform additional checks on the parameter to make sure whether 426 * the specified audio sampling rate is applicable. The sampling rate really depends 427 * on the format for the audio recording, as well as the capabilities of the platform. 428 * For instance, the sampling rate supported by AAC audio coding standard ranges 429 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 430 * supported audio sampling rate. 431 * 432 * @param samplingRate the sampling rate for audio in samples per second. 433 */ 434 public void setAudioSamplingRate(int samplingRate) { 435 if (samplingRate <= 0) { 436 throw new IllegalArgumentException("Audio sampling rate is not positive"); 437 } 438 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 439 } 440 441 /** 442 * Sets the number of audio channels for recording. Call this method before prepare(). 443 * Prepare() may perform additional checks on the parameter to make sure whether the 444 * specified number of audio channels are applicable. 445 * 446 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 447 * (stereo). 448 */ 449 public void setAudioChannels(int numChannels) { 450 if (numChannels <= 0) { 451 throw new IllegalArgumentException("Number of channels is not positive"); 452 } 453 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 454 } 455 456 /** 457 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 458 * Prepare() may perform additional checks on the parameter to make sure whether the 459 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 460 * internally to ensure the audio recording can proceed smoothly based on the 461 * capabilities of the platform. 462 * 463 * @param bitRate the audio encoding bit rate in bits per second. 464 */ 465 public void setAudioEncodingBitRate(int bitRate) { 466 if (bitRate <= 0) { 467 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 468 } 469 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 470 } 471 472 /** 473 * Sets the video encoding bit rate for recording. Call this method before prepare(). 474 * Prepare() may perform additional checks on the parameter to make sure whether the 475 * specified bit rate is applicable, and sometimes the passed bitRate will be 476 * clipped internally to ensure the video recording can proceed smoothly based on 477 * the capabilities of the platform. 478 * 479 * @param bitRate the video encoding bit rate in bits per second. 480 */ 481 public void setVideoEncodingBitRate(int bitRate) { 482 if (bitRate <= 0) { 483 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 484 } 485 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 486 } 487 488 /** 489 * Pass in the file descriptor of the file to be written. Call this after 490 * setOutputFormat() but before prepare(). 491 * 492 * @param fd an open file descriptor to be written into. 493 * @throws IllegalStateException if it is called before 494 * setOutputFormat() or after prepare() 495 */ 496 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 497 { 498 mPath = null; 499 mFd = fd; 500 } 501 502 /** 503 * Sets the path of the output file to be produced. Call this after 504 * setOutputFormat() but before prepare(). 505 * 506 * @param path The pathname to use. 507 * @throws IllegalStateException if it is called before 508 * setOutputFormat() or after prepare() 509 */ 510 public void setOutputFile(String path) throws IllegalStateException 511 { 512 mFd = null; 513 mPath = path; 514 } 515 516 // native implementation 517 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 518 throws IllegalStateException, IOException; 519 private native void _prepare() throws IllegalStateException, IOException; 520 521 /** 522 * Prepares the recorder to begin capturing and encoding data. This method 523 * must be called after setting up the desired audio and video sources, 524 * encoders, file format, etc., but before start(). 525 * 526 * @throws IllegalStateException if it is called after 527 * start() or before setOutputFormat(). 528 * @throws IOException if prepare fails otherwise. 529 */ 530 public void prepare() throws IllegalStateException, IOException 531 { 532 if (mPath != null) { 533 FileOutputStream fos = new FileOutputStream(mPath); 534 try { 535 _setOutputFile(fos.getFD(), 0, 0); 536 } finally { 537 fos.close(); 538 } 539 } else if (mFd != null) { 540 _setOutputFile(mFd, 0, 0); 541 } else { 542 throw new IOException("No valid output file"); 543 } 544 _prepare(); 545 } 546 547 /** 548 * Begins capturing and encoding data to the file specified with 549 * setOutputFile(). Call this after prepare(). 550 * 551 * @throws IllegalStateException if it is called before 552 * prepare(). 553 */ 554 public native void start() throws IllegalStateException; 555 556 /** 557 * Stops recording. Call this after start(). Once recording is stopped, 558 * you will have to configure it again as if it has just been constructed. 559 * 560 * @throws IllegalStateException if it is called before start() 561 */ 562 public native void stop() throws IllegalStateException; 563 564 /** 565 * Restarts the MediaRecorder to its idle state. After calling 566 * this method, you will have to configure it again as if it had just been 567 * constructed. 568 */ 569 public void reset() { 570 native_reset(); 571 572 // make sure none of the listeners get called anymore 573 mEventHandler.removeCallbacksAndMessages(null); 574 } 575 576 private native void native_reset(); 577 578 /** 579 * Returns the maximum absolute amplitude that was sampled since the last 580 * call to this method. Call this only after the setAudioSource(). 581 * 582 * @return the maximum absolute amplitude measured since the last call, or 583 * 0 when called for the first time 584 * @throws IllegalStateException if it is called before 585 * the audio source has been set. 586 */ 587 public native int getMaxAmplitude() throws IllegalStateException; 588 589 /* Do not change this value without updating its counterpart 590 * in include/media/mediarecorder.h! 591 */ 592 /** Unspecified media recorder error. 593 * @see android.media.MediaRecorder.OnErrorListener 594 */ 595 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 596 597 /** 598 * Interface definition for a callback to be invoked when an error 599 * occurs while recording. 600 */ 601 public interface OnErrorListener 602 { 603 /** 604 * Called when an error occurs while recording. 605 * 606 * @param mr the MediaRecorder that encountered the error 607 * @param what the type of error that has occurred: 608 * <ul> 609 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 610 * </ul> 611 * @param extra an extra code, specific to the error type 612 */ 613 void onError(MediaRecorder mr, int what, int extra); 614 } 615 616 /** 617 * Register a callback to be invoked when an error occurs while 618 * recording. 619 * 620 * @param l the callback that will be run 621 */ 622 public void setOnErrorListener(OnErrorListener l) 623 { 624 mOnErrorListener = l; 625 } 626 627 /* Do not change these values without updating their counterparts 628 * in include/media/mediarecorder.h! 629 */ 630 /** Unspecified media recorder error. 631 * @see android.media.MediaRecorder.OnInfoListener 632 */ 633 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 634 /** A maximum duration had been setup and has now been reached. 635 * @see android.media.MediaRecorder.OnInfoListener 636 */ 637 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 638 /** A maximum filesize had been setup and has now been reached. 639 * @see android.media.MediaRecorder.OnInfoListener 640 */ 641 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 642 643 /** 644 * Interface definition for a callback to be invoked when an error 645 * occurs while recording. 646 */ 647 public interface OnInfoListener 648 { 649 /** 650 * Called when an error occurs while recording. 651 * 652 * @param mr the MediaRecorder that encountered the error 653 * @param what the type of error that has occurred: 654 * <ul> 655 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 656 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 657 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 658 * </ul> 659 * @param extra an extra code, specific to the error type 660 */ 661 void onInfo(MediaRecorder mr, int what, int extra); 662 } 663 664 /** 665 * Register a callback to be invoked when an informational event occurs while 666 * recording. 667 * 668 * @param listener the callback that will be run 669 */ 670 public void setOnInfoListener(OnInfoListener listener) 671 { 672 mOnInfoListener = listener; 673 } 674 675 private class EventHandler extends Handler 676 { 677 private MediaRecorder mMediaRecorder; 678 679 public EventHandler(MediaRecorder mr, Looper looper) { 680 super(looper); 681 mMediaRecorder = mr; 682 } 683 684 /* Do not change these values without updating their counterparts 685 * in include/media/mediarecorder.h! 686 */ 687 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 688 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 689 690 @Override 691 public void handleMessage(Message msg) { 692 if (mMediaRecorder.mNativeContext == 0) { 693 Log.w(TAG, "mediarecorder went away with unhandled events"); 694 return; 695 } 696 switch(msg.what) { 697 case MEDIA_RECORDER_EVENT_ERROR: 698 if (mOnErrorListener != null) 699 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 700 701 return; 702 703 case MEDIA_RECORDER_EVENT_INFO: 704 if (mOnInfoListener != null) 705 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 706 707 return; 708 709 default: 710 Log.e(TAG, "Unknown message type " + msg.what); 711 return; 712 } 713 } 714 } 715 716 /** 717 * Called from native code when an interesting event happens. This method 718 * just uses the EventHandler system to post the event back to the main app thread. 719 * We use a weak reference to the original MediaRecorder object so that the native 720 * code is safe from the object disappearing from underneath it. (This is 721 * the cookie passed to native_setup().) 722 */ 723 private static void postEventFromNative(Object mediarecorder_ref, 724 int what, int arg1, int arg2, Object obj) 725 { 726 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 727 if (mr == null) { 728 return; 729 } 730 731 if (mr.mEventHandler != null) { 732 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 733 mr.mEventHandler.sendMessage(m); 734 } 735 } 736 737 /** 738 * Releases resources associated with this MediaRecorder object. 739 * It is good practice to call this method when you're done 740 * using the MediaRecorder. 741 */ 742 public native void release(); 743 744 private static native final void native_init(); 745 746 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 747 748 private native final void native_finalize(); 749 750 private native void setParameter(String nameValuePair); 751 752 @Override 753 protected void finalize() { native_finalize(); } 754 } 755
