MediaRecorder.java revision ab15bce98d44b67f221b6fb8a377744940dda46c
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("time-between-time-lapse-frame-capture=%d", 303 timeBetweenTimeLapseFrameCaptureMs)); 304 setVideoEncoderLevel(encoderLevel); 305 } 306 307 /** 308 * Enables time lapse capture and sets its parameters. This method should 309 * be called after setProfile(). 310 * 311 * @param timeBetweenTimeLapseFrameCaptureMs time between two captures of time lapse frames. 312 * @hide 313 */ 314 public void enableTimeLapse(int timeBetweenTimeLapseFrameCaptureMs) { 315 setParameter(String.format("time-lapse-enable=1")); 316 setParameter(String.format("time-between-time-lapse-frame-capture=%d", 317 timeBetweenTimeLapseFrameCaptureMs)); 318 } 319 320 /** 321 * Sets filename and parameters for auxiliary time lapse video. 322 * 323 * @param fd an open file descriptor to be written into. 324 * @param videoFrameWidth width of the auxiliary video. 325 * @param videoFrameHeight height of the auxiliary video. 326 * @param videoBitRate bit rate of the auxiliary video 327 * @hide 328 * */ 329 public void setAuxVideoParameters(FileDescriptor fd, 330 int videoFrameWidth, int videoFrameHeight, 331 int videoBitRate) { 332 setAuxiliaryOutputFile(fd); 333 setParameter(String.format("video-aux-param-width=%d", videoFrameWidth)); 334 setParameter(String.format("video-aux-param-height=%d", videoFrameHeight)); 335 setParameter(String.format("video-aux-param-encoding-bitrate=%d", videoBitRate)); 336 } 337 338 /** 339 * Sets filename and parameters for auxiliary time lapse video. 340 * 341 * @param path The pathname to use for the auxiliary video. 342 * @param videoFrameWidth width of the auxiliary video. 343 * @param videoFrameHeight height of the auxiliary video. 344 * @param videoBitRate bit rate of the auxiliary video 345 * @hide 346 * */ 347 public void setAuxVideoParameters(String path, 348 int videoFrameWidth, int videoFrameHeight, 349 int videoBitRate) { 350 setAuxiliaryOutputFile(path); 351 setParameter(String.format("video-aux-param-width=%d", videoFrameWidth)); 352 setParameter(String.format("video-aux-param-height=%d", videoFrameHeight)); 353 setParameter(String.format("video-aux-param-encoding-bitrate=%d", videoBitRate)); 354 } 355 356 /** 357 * Sets the format of the output file produced during recording. Call this 358 * after setAudioSource()/setVideoSource() but before prepare(). 359 * 360 * <p>It is recommended to always use 3GP format when using the H.263 361 * video encoder and AMR audio encoder. Using an MPEG-4 container format 362 * may confuse some desktop players.</p> 363 * 364 * @param output_format the output format to use. The output format 365 * needs to be specified before setting recording-parameters or encoders. 366 * @throws IllegalStateException if it is called after prepare() or before 367 * setAudioSource()/setVideoSource(). 368 * @see android.media.MediaRecorder.OutputFormat 369 */ 370 public native void setOutputFormat(int output_format) 371 throws IllegalStateException; 372 373 /** 374 * Sets the width and height of the video to be captured. Must be called 375 * after setVideoSource(). Call this after setOutFormat() but before 376 * prepare(). 377 * 378 * @param width the width of the video to be captured 379 * @param height the height of the video to be captured 380 * @throws IllegalStateException if it is called after 381 * prepare() or before setOutputFormat() 382 */ 383 public native void setVideoSize(int width, int height) 384 throws IllegalStateException; 385 386 /** 387 * Sets the frame rate of the video to be captured. Must be called 388 * after setVideoSource(). Call this after setOutFormat() but before 389 * prepare(). 390 * 391 * @param rate the number of frames per second of video to capture 392 * @throws IllegalStateException if it is called after 393 * prepare() or before setOutputFormat(). 394 * 395 * NOTE: On some devices that have auto-frame rate, this sets the 396 * maximum frame rate, not a constant frame rate. Actual frame rate 397 * will vary according to lighting conditions. 398 */ 399 public native void setVideoFrameRate(int rate) throws IllegalStateException; 400 401 /** 402 * Sets the maximum duration (in ms) of the recording session. 403 * Call this after setOutFormat() but before prepare(). 404 * After recording reaches the specified duration, a notification 405 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 406 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 407 * and recording will be stopped. Stopping happens asynchronously, there 408 * is no guarantee that the recorder will have stopped by the time the 409 * listener is notified. 410 * 411 * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 412 * 413 */ 414 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 415 416 /** 417 * Sets the maximum filesize (in bytes) of the recording session. 418 * Call this after setOutFormat() but before prepare(). 419 * After recording reaches the specified filesize, a notification 420 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 421 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 422 * and recording will be stopped. Stopping happens asynchronously, there 423 * is no guarantee that the recorder will have stopped by the time the 424 * listener is notified. 425 * 426 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 427 * 428 */ 429 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 430 431 /** 432 * Sets the audio encoder to be used for recording. If this method is not 433 * called, the output file will not contain an audio track. Call this after 434 * setOutputFormat() but before prepare(). 435 * 436 * @param audio_encoder the audio encoder to use. 437 * @throws IllegalStateException if it is called before 438 * setOutputFormat() or after prepare(). 439 * @see android.media.MediaRecorder.AudioEncoder 440 */ 441 public native void setAudioEncoder(int audio_encoder) 442 throws IllegalStateException; 443 444 /** 445 * Sets the video encoder to be used for recording. If this method is not 446 * called, the output file will not contain an video track. Call this after 447 * setOutputFormat() and before prepare(). 448 * 449 * @param video_encoder the video encoder to use. 450 * @throws IllegalStateException if it is called before 451 * setOutputFormat() or after prepare() 452 * @see android.media.MediaRecorder.VideoEncoder 453 */ 454 public native void setVideoEncoder(int video_encoder) 455 throws IllegalStateException; 456 457 /** 458 * Sets the audio sampling rate for recording. Call this method before prepare(). 459 * Prepare() may perform additional checks on the parameter to make sure whether 460 * the specified audio sampling rate is applicable. The sampling rate really depends 461 * on the format for the audio recording, as well as the capabilities of the platform. 462 * For instance, the sampling rate supported by AAC audio coding standard ranges 463 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 464 * supported audio sampling rate. 465 * 466 * @param samplingRate the sampling rate for audio in samples per second. 467 */ 468 public void setAudioSamplingRate(int samplingRate) { 469 if (samplingRate <= 0) { 470 throw new IllegalArgumentException("Audio sampling rate is not positive"); 471 } 472 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 473 } 474 475 /** 476 * Sets the number of audio channels for recording. Call this method before prepare(). 477 * Prepare() may perform additional checks on the parameter to make sure whether the 478 * specified number of audio channels are applicable. 479 * 480 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 481 * (stereo). 482 */ 483 public void setAudioChannels(int numChannels) { 484 if (numChannels <= 0) { 485 throw new IllegalArgumentException("Number of channels is not positive"); 486 } 487 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 488 } 489 490 /** 491 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 492 * Prepare() may perform additional checks on the parameter to make sure whether the 493 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 494 * internally to ensure the audio recording can proceed smoothly based on the 495 * capabilities of the platform. 496 * 497 * @param bitRate the audio encoding bit rate in bits per second. 498 */ 499 public void setAudioEncodingBitRate(int bitRate) { 500 if (bitRate <= 0) { 501 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 502 } 503 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 504 } 505 506 /** 507 * Sets the video encoding bit rate for recording. Call this method before prepare(). 508 * Prepare() may perform additional checks on the parameter to make sure whether the 509 * specified bit rate is applicable, and sometimes the passed bitRate will be 510 * clipped internally to ensure the video recording can proceed smoothly based on 511 * the capabilities of the platform. 512 * 513 * @param bitRate the video encoding bit rate in bits per second. 514 */ 515 public void setVideoEncodingBitRate(int bitRate) { 516 if (bitRate <= 0) { 517 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 518 } 519 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 520 } 521 522 /** 523 * Sets the level of the encoder. Call this before prepare(). 524 * 525 * @param encoderLevel the video encoder level. 526 * @hide 527 */ 528 public void setVideoEncoderLevel(int encoderLevel) { 529 setParameter(String.format("video-param-encoder-level=%d", encoderLevel)); 530 } 531 532 /** 533 * Pass in the file descriptor of the auxiliary file to be written. Call this after 534 * setOutputFormat() but before prepare(). 535 * 536 * @param fd an open file descriptor to be written into. 537 * @throws IllegalStateException if it is called before 538 * setOutputFormat() or after prepare() 539 */ 540 private void setAuxiliaryOutputFile(FileDescriptor fd) throws IllegalStateException 541 { 542 mPrepareAuxiliaryFile = true; 543 mPathAux = null; 544 mFdAux = fd; 545 } 546 547 /** 548 * Sets the path of the auxiliary output file to be produced. Call this after 549 * setOutputFormat() but before prepare(). 550 * 551 * @param path The pathname to use. 552 * @throws IllegalStateException if it is called before 553 * setOutputFormat() or after prepare() 554 */ 555 private void setAuxiliaryOutputFile(String path) throws IllegalStateException 556 { 557 mPrepareAuxiliaryFile = true; 558 mFdAux = null; 559 mPathAux = path; 560 } 561 562 /** 563 * Pass in the file descriptor of the file to be written. Call this after 564 * setOutputFormat() but before prepare(). 565 * 566 * @param fd an open file descriptor to be written into. 567 * @throws IllegalStateException if it is called before 568 * setOutputFormat() or after prepare() 569 */ 570 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 571 { 572 mPath = null; 573 mFd = fd; 574 } 575 576 /** 577 * Sets the path of the output file to be produced. Call this after 578 * setOutputFormat() but before prepare(). 579 * 580 * @param path The pathname to use. 581 * @throws IllegalStateException if it is called before 582 * setOutputFormat() or after prepare() 583 */ 584 public void setOutputFile(String path) throws IllegalStateException 585 { 586 mFd = null; 587 mPath = path; 588 } 589 590 // native implementation 591 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 592 throws IllegalStateException, IOException; 593 private native void _setOutputFileAux(FileDescriptor fd) 594 throws IllegalStateException, IOException; 595 private native void _prepare() throws IllegalStateException, IOException; 596 597 /** 598 * Prepares the recorder to begin capturing and encoding data. This method 599 * must be called after setting up the desired audio and video sources, 600 * encoders, file format, etc., but before start(). 601 * 602 * @throws IllegalStateException if it is called after 603 * start() or before setOutputFormat(). 604 * @throws IOException if prepare fails otherwise. 605 */ 606 public void prepare() throws IllegalStateException, IOException 607 { 608 if (mPath != null) { 609 FileOutputStream fos = new FileOutputStream(mPath); 610 try { 611 _setOutputFile(fos.getFD(), 0, 0); 612 } finally { 613 fos.close(); 614 } 615 } else if (mFd != null) { 616 _setOutputFile(mFd, 0, 0); 617 } else { 618 throw new IOException("No valid output file"); 619 } 620 621 if (mPrepareAuxiliaryFile) { 622 if (mPathAux != null) { 623 FileOutputStream fos = new FileOutputStream(mPathAux); 624 try { 625 _setOutputFileAux(fos.getFD()); 626 } finally { 627 fos.close(); 628 } 629 } else if (mFdAux != null) { 630 _setOutputFileAux(mFdAux); 631 } else { 632 throw new IOException("No valid output file"); 633 } 634 } 635 636 _prepare(); 637 } 638 639 /** 640 * Begins capturing and encoding data to the file specified with 641 * setOutputFile(). Call this after prepare(). 642 * 643 * @throws IllegalStateException if it is called before 644 * prepare(). 645 */ 646 public native void start() throws IllegalStateException; 647 648 /** 649 * Stops recording. Call this after start(). Once recording is stopped, 650 * you will have to configure it again as if it has just been constructed. 651 * 652 * @throws IllegalStateException if it is called before start() 653 */ 654 public native void stop() throws IllegalStateException; 655 656 /** 657 * Restarts the MediaRecorder to its idle state. After calling 658 * this method, you will have to configure it again as if it had just been 659 * constructed. 660 */ 661 public void reset() { 662 native_reset(); 663 664 // make sure none of the listeners get called anymore 665 mEventHandler.removeCallbacksAndMessages(null); 666 } 667 668 private native void native_reset(); 669 670 /** 671 * Returns the maximum absolute amplitude that was sampled since the last 672 * call to this method. Call this only after the setAudioSource(). 673 * 674 * @return the maximum absolute amplitude measured since the last call, or 675 * 0 when called for the first time 676 * @throws IllegalStateException if it is called before 677 * the audio source has been set. 678 */ 679 public native int getMaxAmplitude() throws IllegalStateException; 680 681 /* Do not change this value without updating its counterpart 682 * in include/media/mediarecorder.h! 683 */ 684 /** Unspecified media recorder error. 685 * @see android.media.MediaRecorder.OnErrorListener 686 */ 687 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 688 689 /** 690 * Interface definition for a callback to be invoked when an error 691 * occurs while recording. 692 */ 693 public interface OnErrorListener 694 { 695 /** 696 * Called when an error occurs while recording. 697 * 698 * @param mr the MediaRecorder that encountered the error 699 * @param what the type of error that has occurred: 700 * <ul> 701 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 702 * </ul> 703 * @param extra an extra code, specific to the error type 704 */ 705 void onError(MediaRecorder mr, int what, int extra); 706 } 707 708 /** 709 * Register a callback to be invoked when an error occurs while 710 * recording. 711 * 712 * @param l the callback that will be run 713 */ 714 public void setOnErrorListener(OnErrorListener l) 715 { 716 mOnErrorListener = l; 717 } 718 719 /* Do not change these values without updating their counterparts 720 * in include/media/mediarecorder.h! 721 */ 722 /** Unspecified media recorder error. 723 * @see android.media.MediaRecorder.OnInfoListener 724 */ 725 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 726 /** A maximum duration had been setup and has now been reached. 727 * @see android.media.MediaRecorder.OnInfoListener 728 */ 729 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 730 /** A maximum filesize had been setup and has now been reached. 731 * @see android.media.MediaRecorder.OnInfoListener 732 */ 733 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 734 735 /** 736 * Interface definition for a callback to be invoked when an error 737 * occurs while recording. 738 */ 739 public interface OnInfoListener 740 { 741 /** 742 * Called when an error occurs while recording. 743 * 744 * @param mr the MediaRecorder that encountered the error 745 * @param what the type of error that has occurred: 746 * <ul> 747 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 748 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 749 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 750 * </ul> 751 * @param extra an extra code, specific to the error type 752 */ 753 void onInfo(MediaRecorder mr, int what, int extra); 754 } 755 756 /** 757 * Register a callback to be invoked when an informational event occurs while 758 * recording. 759 * 760 * @param listener the callback that will be run 761 */ 762 public void setOnInfoListener(OnInfoListener listener) 763 { 764 mOnInfoListener = listener; 765 } 766 767 private class EventHandler extends Handler 768 { 769 private MediaRecorder mMediaRecorder; 770 771 public EventHandler(MediaRecorder mr, Looper looper) { 772 super(looper); 773 mMediaRecorder = mr; 774 } 775 776 /* Do not change these values without updating their counterparts 777 * in include/media/mediarecorder.h! 778 */ 779 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 780 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 781 782 @Override 783 public void handleMessage(Message msg) { 784 if (mMediaRecorder.mNativeContext == 0) { 785 Log.w(TAG, "mediarecorder went away with unhandled events"); 786 return; 787 } 788 switch(msg.what) { 789 case MEDIA_RECORDER_EVENT_ERROR: 790 if (mOnErrorListener != null) 791 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 792 793 return; 794 795 case MEDIA_RECORDER_EVENT_INFO: 796 if (mOnInfoListener != null) 797 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 798 799 return; 800 801 default: 802 Log.e(TAG, "Unknown message type " + msg.what); 803 return; 804 } 805 } 806 } 807 808 /** 809 * Called from native code when an interesting event happens. This method 810 * just uses the EventHandler system to post the event back to the main app thread. 811 * We use a weak reference to the original MediaRecorder object so that the native 812 * code is safe from the object disappearing from underneath it. (This is 813 * the cookie passed to native_setup().) 814 */ 815 private static void postEventFromNative(Object mediarecorder_ref, 816 int what, int arg1, int arg2, Object obj) 817 { 818 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 819 if (mr == null) { 820 return; 821 } 822 823 if (mr.mEventHandler != null) { 824 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 825 mr.mEventHandler.sendMessage(m); 826 } 827 } 828 829 /** 830 * Releases resources associated with this MediaRecorder object. 831 * It is good practice to call this method when you're done 832 * using the MediaRecorder. 833 */ 834 public native void release(); 835 836 private static native final void native_init(); 837 838 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 839 840 private native final void native_finalize(); 841 842 private native void setParameter(String nameValuePair); 843 844 @Override 845 protected void finalize() { native_finalize(); } 846} 847