MediaRecorder.java revision b33a5aea130b025f30966828562fcba56f25b265
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 boolean mPrepareAuxiliaryFile = false; 76 private String mPathAux; 77 private FileDescriptor mFdAux; 78 private EventHandler mEventHandler; 79 private OnErrorListener mOnErrorListener; 80 private OnInfoListener mOnInfoListener; 81 82 /** 83 * Default constructor. 84 */ 85 public MediaRecorder() { 86 87 Looper looper; 88 if ((looper = Looper.myLooper()) != null) { 89 mEventHandler = new EventHandler(this, looper); 90 } else if ((looper = Looper.getMainLooper()) != null) { 91 mEventHandler = new EventHandler(this, looper); 92 } else { 93 mEventHandler = null; 94 } 95 96 /* Native setup requires a weak reference to our object. 97 * It's easier to create it here than in C++. 98 */ 99 native_setup(new WeakReference<MediaRecorder>(this)); 100 } 101 102 /** 103 * Sets a Camera to use for recording. Use this function to switch 104 * quickly between preview and capture mode without a teardown of 105 * the camera object. Must call before prepare(). 106 * 107 * @param c the Camera to use for recording 108 */ 109 public native void setCamera(Camera c); 110 111 /** 112 * Sets a Surface to show a preview of recorded media (video). Calls this 113 * before prepare() to make sure that the desirable preview display is 114 * set. 115 * 116 * @param sv the Surface to use for the preview 117 */ 118 public void setPreviewDisplay(Surface sv) { 119 mSurface = sv; 120 } 121 122 /** 123 * Defines the audio source. These constants are used with 124 * {@link MediaRecorder#setAudioSource(int)}. 125 */ 126 public final class AudioSource { 127 /* Do not change these values without updating their counterparts 128 * in include/media/mediarecorder.h! 129 */ 130 private AudioSource() {} 131 public static final int DEFAULT = 0; 132 /** Microphone audio source */ 133 public static final int MIC = 1; 134 135 /** Voice call uplink (Tx) audio source */ 136 public static final int VOICE_UPLINK = 2; 137 138 /** Voice call downlink (Rx) audio source */ 139 public static final int VOICE_DOWNLINK = 3; 140 141 /** Voice call uplink + downlink audio source */ 142 public static final int VOICE_CALL = 4; 143 144 /** Microphone audio source with same orientation as camera if available, the main 145 * device microphone otherwise */ 146 public static final int CAMCORDER = 5; 147 148 /** Microphone audio source tuned for voice recognition if available, behaves like 149 * {@link #DEFAULT} otherwise. */ 150 public static final int VOICE_RECOGNITION = 6; 151 } 152 153 /** 154 * Defines the video source. These constants are used with 155 * {@link MediaRecorder#setVideoSource(int)}. 156 */ 157 public final class VideoSource { 158 /* Do not change these values without updating their counterparts 159 * in include/media/mediarecorder.h! 160 */ 161 private VideoSource() {} 162 public static final int DEFAULT = 0; 163 /** Camera video source */ 164 public static final int CAMERA = 1; 165 } 166 167 /** 168 * Defines the output format. These constants are used with 169 * {@link MediaRecorder#setOutputFormat(int)}. 170 */ 171 public final class OutputFormat { 172 /* Do not change these values without updating their counterparts 173 * in include/media/mediarecorder.h! 174 */ 175 private OutputFormat() {} 176 public static final int DEFAULT = 0; 177 /** 3GPP media file format*/ 178 public static final int THREE_GPP = 1; 179 /** MPEG4 media file format*/ 180 public static final int MPEG_4 = 2; 181 182 /** The following formats are audio only .aac or .amr formats **/ 183 /** @deprecated Deprecated in favor of AMR_NB */ 184 /** TODO: change link when AMR_NB is exposed. Deprecated in favor of MediaRecorder.OutputFormat.AMR_NB */ 185 public static final int RAW_AMR = 3; 186 /** @hide AMR NB file format */ 187 public static final int AMR_NB = 3; 188 /** @hide AMR WB file format */ 189 public static final int AMR_WB = 4; 190 /** @hide AAC ADIF file format */ 191 public static final int AAC_ADIF = 5; 192 /** @hide AAC ADTS file format */ 193 public static final int AAC_ADTS = 6; 194 195 /** @hide Stream over a socket, limited to a single stream */ 196 public static final int OUTPUT_FORMAT_RTP_AVP = 7; 197 }; 198 199 /** 200 * Defines the audio encoding. These constants are used with 201 * {@link MediaRecorder#setAudioEncoder(int)}. 202 */ 203 public final class AudioEncoder { 204 /* Do not change these values without updating their counterparts 205 * in include/media/mediarecorder.h! 206 */ 207 private AudioEncoder() {} 208 public static final int DEFAULT = 0; 209 /** AMR (Narrowband) audio codec */ 210 public static final int AMR_NB = 1; 211 /** @hide AMR (Wideband) audio codec */ 212 public static final int AMR_WB = 2; 213 /** @hide AAC audio codec */ 214 public static final int AAC = 3; 215 /** @hide enhanced AAC audio codec */ 216 public static final int AAC_PLUS = 4; 217 /** @hide enhanced AAC plus audio codec */ 218 public static final int EAAC_PLUS = 5; 219 } 220 221 /** 222 * Defines the video encoding. These constants are used with 223 * {@link MediaRecorder#setVideoEncoder(int)}. 224 */ 225 public final class VideoEncoder { 226 /* Do not change these values without updating their counterparts 227 * in include/media/mediarecorder.h! 228 */ 229 private VideoEncoder() {} 230 public static final int DEFAULT = 0; 231 public static final int H263 = 1; 232 public static final int H264 = 2; 233 public static final int MPEG_4_SP = 3; 234 } 235 236 /** 237 * Sets the audio source to be used for recording. If this method is not 238 * called, the output file will not contain an audio track. The source needs 239 * to be specified before setting recording-parameters or encoders. Call 240 * this only before setOutputFormat(). 241 * 242 * @param audio_source the audio source to use 243 * @throws IllegalStateException if it is called after setOutputFormat() 244 * @see android.media.MediaRecorder.AudioSource 245 */ 246 public native void setAudioSource(int audio_source) 247 throws IllegalStateException; 248 249 /** 250 * Gets the maximum value for audio sources. 251 * @see android.media.MediaRecorder.AudioSource 252 */ 253 public static final int getAudioSourceMax() { return AudioSource.VOICE_RECOGNITION; } 254 255 /** 256 * Sets the video source to be used for recording. If this method is not 257 * called, the output file will not contain an video track. The source needs 258 * to be specified before setting recording-parameters or encoders. Call 259 * this only before setOutputFormat(). 260 * 261 * @param video_source the video source to use 262 * @throws IllegalStateException if it is called after setOutputFormat() 263 * @see android.media.MediaRecorder.VideoSource 264 */ 265 public native void setVideoSource(int video_source) 266 throws IllegalStateException; 267 268 /** 269 * Uses the settings from a CamcorderProfile object for recording. This method should 270 * be called after the video AND audio sources are set, and before setOutputFile(). 271 * 272 * @param profile the CamcorderProfile to use 273 * @see android.media.CamcorderProfile 274 */ 275 public void setProfile(CamcorderProfile profile) { 276 setOutputFormat(profile.fileFormat); 277 setVideoFrameRate(profile.videoFrameRate); 278 setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight); 279 setVideoEncodingBitRate(profile.videoBitRate); 280 setAudioEncodingBitRate(profile.audioBitRate); 281 setAudioChannels(profile.audioChannels); 282 setAudioSamplingRate(profile.audioSampleRate); 283 setVideoEncoder(profile.videoCodec); 284 setAudioEncoder(profile.audioCodec); 285 } 286 287 /** 288 * Enables/Disables time lapse capture and sets its parameters. This method should 289 * be called after setProfile(). 290 * 291 * @param enableTimeLapse Pass true to enable time lapse capture, false to disable it. 292 * @param useStillCameraForTimeLapse Pass true to use still camera for capturing time lapse 293 * frames, false to use the video camera. 294 * @param timeBetweenTimeLapseFrameCaptureMs time between two captures of time lapse frames. 295 * @param encoderLevel the video encoder level. 296 */ 297 public void setTimeLapseParameters(boolean enableTimeLapse, 298 boolean useStillCameraForTimeLapse, 299 int timeBetweenTimeLapseFrameCaptureMs, int encoderLevel) { 300 setParameter(String.format("time-lapse-enable=%d", 301 (enableTimeLapse) ? 1 : 0)); 302 setParameter(String.format("use-still-camera-for-time-lapse=%d", 303 (useStillCameraForTimeLapse) ? 1 : 0)); 304 setParameter(String.format("time-between-time-lapse-frame-capture=%d", 305 timeBetweenTimeLapseFrameCaptureMs)); 306 setVideoEncoderLevel(encoderLevel); 307 } 308 309 /** 310 * Sets the format of the output file produced during recording. Call this 311 * after setAudioSource()/setVideoSource() but before prepare(). 312 * 313 * <p>It is recommended to always use 3GP format when using the H.263 314 * video encoder and AMR audio encoder. Using an MPEG-4 container format 315 * may confuse some desktop players.</p> 316 * 317 * @param output_format the output format to use. The output format 318 * needs to be specified before setting recording-parameters or encoders. 319 * @throws IllegalStateException if it is called after prepare() or before 320 * setAudioSource()/setVideoSource(). 321 * @see android.media.MediaRecorder.OutputFormat 322 */ 323 public native void setOutputFormat(int output_format) 324 throws IllegalStateException; 325 326 /** 327 * Sets the width and height of the video to be captured. Must be called 328 * after setVideoSource(). Call this after setOutFormat() but before 329 * prepare(). 330 * 331 * @param width the width of the video to be captured 332 * @param height the height of the video to be captured 333 * @throws IllegalStateException if it is called after 334 * prepare() or before setOutputFormat() 335 */ 336 public native void setVideoSize(int width, int height) 337 throws IllegalStateException; 338 339 /** 340 * Sets the frame rate of the video to be captured. Must be called 341 * after setVideoSource(). Call this after setOutFormat() but before 342 * prepare(). 343 * 344 * @param rate the number of frames per second of video to capture 345 * @throws IllegalStateException if it is called after 346 * prepare() or before setOutputFormat(). 347 * 348 * NOTE: On some devices that have auto-frame rate, this sets the 349 * maximum frame rate, not a constant frame rate. Actual frame rate 350 * will vary according to lighting conditions. 351 */ 352 public native void setVideoFrameRate(int rate) throws IllegalStateException; 353 354 /** 355 * Sets the maximum duration (in ms) of the recording session. 356 * Call this after setOutFormat() but before prepare(). 357 * After recording reaches the specified duration, a notification 358 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 359 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 360 * and recording will be stopped. Stopping happens asynchronously, there 361 * is no guarantee that the recorder will have stopped by the time the 362 * listener is notified. 363 * 364 * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 365 * 366 */ 367 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 368 369 /** 370 * Sets the maximum filesize (in bytes) of the recording session. 371 * Call this after setOutFormat() but before prepare(). 372 * After recording reaches the specified filesize, a notification 373 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 374 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 375 * and recording will be stopped. Stopping happens asynchronously, there 376 * is no guarantee that the recorder will have stopped by the time the 377 * listener is notified. 378 * 379 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 380 * 381 */ 382 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 383 384 /** 385 * Sets the audio encoder to be used for recording. If this method is not 386 * called, the output file will not contain an audio track. Call this after 387 * setOutputFormat() but before prepare(). 388 * 389 * @param audio_encoder the audio encoder to use. 390 * @throws IllegalStateException if it is called before 391 * setOutputFormat() or after prepare(). 392 * @see android.media.MediaRecorder.AudioEncoder 393 */ 394 public native void setAudioEncoder(int audio_encoder) 395 throws IllegalStateException; 396 397 /** 398 * Sets the video encoder to be used for recording. If this method is not 399 * called, the output file will not contain an video track. Call this after 400 * setOutputFormat() and before prepare(). 401 * 402 * @param video_encoder the video encoder to use. 403 * @throws IllegalStateException if it is called before 404 * setOutputFormat() or after prepare() 405 * @see android.media.MediaRecorder.VideoEncoder 406 */ 407 public native void setVideoEncoder(int video_encoder) 408 throws IllegalStateException; 409 410 /** 411 * Sets the audio sampling rate for recording. Call this method before prepare(). 412 * Prepare() may perform additional checks on the parameter to make sure whether 413 * the specified audio sampling rate is applicable. The sampling rate really depends 414 * on the format for the audio recording, as well as the capabilities of the platform. 415 * For instance, the sampling rate supported by AAC audio coding standard ranges 416 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 417 * supported audio sampling rate. 418 * 419 * @param samplingRate the sampling rate for audio in samples per second. 420 */ 421 public void setAudioSamplingRate(int samplingRate) { 422 if (samplingRate <= 0) { 423 throw new IllegalArgumentException("Audio sampling rate is not positive"); 424 } 425 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 426 } 427 428 /** 429 * Sets the number of audio channels for recording. Call this method before prepare(). 430 * Prepare() may perform additional checks on the parameter to make sure whether the 431 * specified number of audio channels are applicable. 432 * 433 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 434 * (stereo). 435 */ 436 public void setAudioChannels(int numChannels) { 437 if (numChannels <= 0) { 438 throw new IllegalArgumentException("Number of channels is not positive"); 439 } 440 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 441 } 442 443 /** 444 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 445 * Prepare() may perform additional checks on the parameter to make sure whether the 446 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 447 * internally to ensure the audio recording can proceed smoothly based on the 448 * capabilities of the platform. 449 * 450 * @param bitRate the audio encoding bit rate in bits per second. 451 */ 452 public void setAudioEncodingBitRate(int bitRate) { 453 if (bitRate <= 0) { 454 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 455 } 456 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 457 } 458 459 /** 460 * Sets the video encoding bit rate for recording. Call this method before prepare(). 461 * Prepare() may perform additional checks on the parameter to make sure whether the 462 * specified bit rate is applicable, and sometimes the passed bitRate will be 463 * clipped internally to ensure the video recording can proceed smoothly based on 464 * the capabilities of the platform. 465 * 466 * @param bitRate the video encoding bit rate in bits per second. 467 */ 468 public void setVideoEncodingBitRate(int bitRate) { 469 if (bitRate <= 0) { 470 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 471 } 472 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 473 } 474 475 /** 476 * Sets the level of the encoder. Call this before prepare(). 477 * 478 * @param encoderLevel the video encoder level. 479 * @hide 480 */ 481 public void setVideoEncoderLevel(int encoderLevel) { 482 setParameter(String.format("video-param-encoder-level=%d", encoderLevel)); 483 } 484 485 /** 486 * Pass in the file descriptor of the auxiliary file to be written. Call this after 487 * setOutputFormat() but before prepare(). 488 * 489 * @param fd an open file descriptor to be written into. 490 * @throws IllegalStateException if it is called before 491 * setOutputFormat() or after prepare() 492 * @hide 493 */ 494 public void setAuxiliaryOutputFile(FileDescriptor fd) throws IllegalStateException 495 { 496 mPrepareAuxiliaryFile = true; 497 mPathAux = null; 498 mFdAux = fd; 499 } 500 501 /** 502 * Sets the path of the auxiliary output file to be produced. Call this after 503 * setOutputFormat() but before prepare(). 504 * 505 * @param path The pathname to use. 506 * @throws IllegalStateException if it is called before 507 * setOutputFormat() or after prepare() 508 * @hide 509 */ 510 public void setAuxiliaryOutputFile(String path) throws IllegalStateException 511 { 512 mPrepareAuxiliaryFile = true; 513 mFdAux = null; 514 mPathAux = path; 515 } 516 517 /** 518 * Pass in the file descriptor of the file to be written. Call this after 519 * setOutputFormat() but before prepare(). 520 * 521 * @param fd an open file descriptor to be written into. 522 * @throws IllegalStateException if it is called before 523 * setOutputFormat() or after prepare() 524 */ 525 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 526 { 527 mPath = null; 528 mFd = fd; 529 } 530 531 /** 532 * Sets the path of the output file to be produced. Call this after 533 * setOutputFormat() but before prepare(). 534 * 535 * @param path The pathname to use. 536 * @throws IllegalStateException if it is called before 537 * setOutputFormat() or after prepare() 538 */ 539 public void setOutputFile(String path) throws IllegalStateException 540 { 541 mFd = null; 542 mPath = path; 543 } 544 545 // native implementation 546 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 547 throws IllegalStateException, IOException; 548 private native void _setOutputFileAux(FileDescriptor fd) 549 throws IllegalStateException, IOException; 550 private native void _prepare() throws IllegalStateException, IOException; 551 552 /** 553 * Prepares the recorder to begin capturing and encoding data. This method 554 * must be called after setting up the desired audio and video sources, 555 * encoders, file format, etc., but before start(). 556 * 557 * @throws IllegalStateException if it is called after 558 * start() or before setOutputFormat(). 559 * @throws IOException if prepare fails otherwise. 560 */ 561 public void prepare() throws IllegalStateException, IOException 562 { 563 if (mPath != null) { 564 FileOutputStream fos = new FileOutputStream(mPath); 565 try { 566 _setOutputFile(fos.getFD(), 0, 0); 567 } finally { 568 fos.close(); 569 } 570 } else if (mFd != null) { 571 _setOutputFile(mFd, 0, 0); 572 } else { 573 throw new IOException("No valid output file"); 574 } 575 576 if (mPrepareAuxiliaryFile) { 577 if (mPathAux != null) { 578 FileOutputStream fos = new FileOutputStream(mPathAux); 579 try { 580 _setOutputFileAux(fos.getFD()); 581 } finally { 582 fos.close(); 583 } 584 } else if (mFdAux != null) { 585 _setOutputFileAux(mFdAux); 586 } else { 587 throw new IOException("No valid output file"); 588 } 589 } 590 591 _prepare(); 592 } 593 594 /** 595 * Begins capturing and encoding data to the file specified with 596 * setOutputFile(). Call this after prepare(). 597 * 598 * @throws IllegalStateException if it is called before 599 * prepare(). 600 */ 601 public native void start() throws IllegalStateException; 602 603 /** 604 * Stops recording. Call this after start(). Once recording is stopped, 605 * you will have to configure it again as if it has just been constructed. 606 * 607 * @throws IllegalStateException if it is called before start() 608 */ 609 public native void stop() throws IllegalStateException; 610 611 /** 612 * Restarts the MediaRecorder to its idle state. After calling 613 * this method, you will have to configure it again as if it had just been 614 * constructed. 615 */ 616 public void reset() { 617 native_reset(); 618 619 // make sure none of the listeners get called anymore 620 mEventHandler.removeCallbacksAndMessages(null); 621 } 622 623 private native void native_reset(); 624 625 /** 626 * Returns the maximum absolute amplitude that was sampled since the last 627 * call to this method. Call this only after the setAudioSource(). 628 * 629 * @return the maximum absolute amplitude measured since the last call, or 630 * 0 when called for the first time 631 * @throws IllegalStateException if it is called before 632 * the audio source has been set. 633 */ 634 public native int getMaxAmplitude() throws IllegalStateException; 635 636 /* Do not change this value without updating its counterpart 637 * in include/media/mediarecorder.h! 638 */ 639 /** Unspecified media recorder error. 640 * @see android.media.MediaRecorder.OnErrorListener 641 */ 642 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 643 644 /** 645 * Interface definition for a callback to be invoked when an error 646 * occurs while recording. 647 */ 648 public interface OnErrorListener 649 { 650 /** 651 * Called when an error occurs while recording. 652 * 653 * @param mr the MediaRecorder that encountered the error 654 * @param what the type of error that has occurred: 655 * <ul> 656 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 657 * </ul> 658 * @param extra an extra code, specific to the error type 659 */ 660 void onError(MediaRecorder mr, int what, int extra); 661 } 662 663 /** 664 * Register a callback to be invoked when an error occurs while 665 * recording. 666 * 667 * @param l the callback that will be run 668 */ 669 public void setOnErrorListener(OnErrorListener l) 670 { 671 mOnErrorListener = l; 672 } 673 674 /* Do not change these values without updating their counterparts 675 * in include/media/mediarecorder.h! 676 */ 677 /** Unspecified media recorder error. 678 * @see android.media.MediaRecorder.OnInfoListener 679 */ 680 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 681 /** A maximum duration had been setup and has now been reached. 682 * @see android.media.MediaRecorder.OnInfoListener 683 */ 684 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 685 /** A maximum filesize had been setup and has now been reached. 686 * @see android.media.MediaRecorder.OnInfoListener 687 */ 688 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 689 690 /** 691 * Interface definition for a callback to be invoked when an error 692 * occurs while recording. 693 */ 694 public interface OnInfoListener 695 { 696 /** 697 * Called when an error occurs while recording. 698 * 699 * @param mr the MediaRecorder that encountered the error 700 * @param what the type of error that has occurred: 701 * <ul> 702 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 703 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 704 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 705 * </ul> 706 * @param extra an extra code, specific to the error type 707 */ 708 void onInfo(MediaRecorder mr, int what, int extra); 709 } 710 711 /** 712 * Register a callback to be invoked when an informational event occurs while 713 * recording. 714 * 715 * @param listener the callback that will be run 716 */ 717 public void setOnInfoListener(OnInfoListener listener) 718 { 719 mOnInfoListener = listener; 720 } 721 722 private class EventHandler extends Handler 723 { 724 private MediaRecorder mMediaRecorder; 725 726 public EventHandler(MediaRecorder mr, Looper looper) { 727 super(looper); 728 mMediaRecorder = mr; 729 } 730 731 /* Do not change these values without updating their counterparts 732 * in include/media/mediarecorder.h! 733 */ 734 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 735 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 736 737 @Override 738 public void handleMessage(Message msg) { 739 if (mMediaRecorder.mNativeContext == 0) { 740 Log.w(TAG, "mediarecorder went away with unhandled events"); 741 return; 742 } 743 switch(msg.what) { 744 case MEDIA_RECORDER_EVENT_ERROR: 745 if (mOnErrorListener != null) 746 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 747 748 return; 749 750 case MEDIA_RECORDER_EVENT_INFO: 751 if (mOnInfoListener != null) 752 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 753 754 return; 755 756 default: 757 Log.e(TAG, "Unknown message type " + msg.what); 758 return; 759 } 760 } 761 } 762 763 /** 764 * Called from native code when an interesting event happens. This method 765 * just uses the EventHandler system to post the event back to the main app thread. 766 * We use a weak reference to the original MediaRecorder object so that the native 767 * code is safe from the object disappearing from underneath it. (This is 768 * the cookie passed to native_setup().) 769 */ 770 private static void postEventFromNative(Object mediarecorder_ref, 771 int what, int arg1, int arg2, Object obj) 772 { 773 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 774 if (mr == null) { 775 return; 776 } 777 778 if (mr.mEventHandler != null) { 779 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 780 mr.mEventHandler.sendMessage(m); 781 } 782 } 783 784 /** 785 * Releases resources associated with this MediaRecorder object. 786 * It is good practice to call this method when you're done 787 * using the MediaRecorder. 788 */ 789 public native void release(); 790 791 private static native final void native_init(); 792 793 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 794 795 private native final void native_finalize(); 796 797 private native void setParameter(String nameValuePair); 798 799 @Override 800 protected void finalize() { native_finalize(); } 801} 802