MediaRecorder.java revision 1fec21be65ddda46fe39c40e00d2fb94a8ce59f1
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 setVideoEncoder(profile.videoCodec); 281 if (profile.quality >= CamcorderProfile.QUALITY_TIME_LAPSE_LOW && 282 profile.quality <= CamcorderProfile.QUALITY_TIME_LAPSE_1080P) { 283 // Enable time lapse. Also don't set audio for time lapse. 284 setParameter(String.format("time-lapse-enable=1")); 285 } else { 286 setAudioEncodingBitRate(profile.audioBitRate); 287 setAudioChannels(profile.audioChannels); 288 setAudioSamplingRate(profile.audioSampleRate); 289 setAudioEncoder(profile.audioCodec); 290 } 291 } 292 293 /** 294 * Set video frame capture rate. This can be used to set a different video frame capture 295 * rate than the recorded video's playback rate. Currently this works only for time lapse mode. 296 * 297 * @param fps Rate at which frames should be captured in frames per second. 298 * The fps can go as low as desired. However the fastest fps will be limited by the hardware. 299 * For resolutions that can be captured by the video camera, the fastest fps can be computed using 300 * {@link android.hardware.Camera.Parameters#getPreviewFpsRange(int[])}. For higher 301 * resolutions the fastest fps may be more restrictive. 302 * Note that the recorder cannot guarantee that frames will be captured at the 303 * given rate due to camera/encoder limitations. However it tries to be as close as 304 * possible. 305 */ 306 public void setCaptureRate(double fps) { 307 double timeBetweenFrameCapture = 1 / fps; 308 int timeBetweenFrameCaptureMs = (int) (1000 * timeBetweenFrameCapture); 309 setParameter(String.format("time-between-time-lapse-frame-capture=%d", 310 timeBetweenFrameCaptureMs)); 311 } 312 313 /** 314 * Sets the format of the output file produced during recording. Call this 315 * after setAudioSource()/setVideoSource() but before prepare(). 316 * 317 * <p>It is recommended to always use 3GP format when using the H.263 318 * video encoder and AMR audio encoder. Using an MPEG-4 container format 319 * may confuse some desktop players.</p> 320 * 321 * @param output_format the output format to use. The output format 322 * needs to be specified before setting recording-parameters or encoders. 323 * @throws IllegalStateException if it is called after prepare() or before 324 * setAudioSource()/setVideoSource(). 325 * @see android.media.MediaRecorder.OutputFormat 326 */ 327 public native void setOutputFormat(int output_format) 328 throws IllegalStateException; 329 330 /** 331 * Sets the width and height of the video to be captured. Must be called 332 * after setVideoSource(). Call this after setOutFormat() but before 333 * prepare(). 334 * 335 * @param width the width of the video to be captured 336 * @param height the height of the video to be captured 337 * @throws IllegalStateException if it is called after 338 * prepare() or before setOutputFormat() 339 */ 340 public native void setVideoSize(int width, int height) 341 throws IllegalStateException; 342 343 /** 344 * Sets the frame rate of the video to be captured. Must be called 345 * after setVideoSource(). Call this after setOutFormat() but before 346 * prepare(). 347 * 348 * @param rate the number of frames per second of video to capture 349 * @throws IllegalStateException if it is called after 350 * prepare() or before setOutputFormat(). 351 * 352 * NOTE: On some devices that have auto-frame rate, this sets the 353 * maximum frame rate, not a constant frame rate. Actual frame rate 354 * will vary according to lighting conditions. 355 */ 356 public native void setVideoFrameRate(int rate) throws IllegalStateException; 357 358 /** 359 * Sets the maximum duration (in ms) of the recording session. 360 * Call this after setOutFormat() but before prepare(). 361 * After recording reaches the specified duration, a notification 362 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 363 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_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_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 369 * 370 */ 371 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 372 373 /** 374 * Sets the maximum filesize (in bytes) of the recording session. 375 * Call this after setOutFormat() but before prepare(). 376 * After recording reaches the specified filesize, a notification 377 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 378 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 379 * and recording will be stopped. Stopping happens asynchronously, there 380 * is no guarantee that the recorder will have stopped by the time the 381 * listener is notified. 382 * 383 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 384 * 385 */ 386 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 387 388 /** 389 * Sets the audio encoder to be used for recording. If this method is not 390 * called, the output file will not contain an audio track. Call this after 391 * setOutputFormat() but before prepare(). 392 * 393 * @param audio_encoder the audio encoder to use. 394 * @throws IllegalStateException if it is called before 395 * setOutputFormat() or after prepare(). 396 * @see android.media.MediaRecorder.AudioEncoder 397 */ 398 public native void setAudioEncoder(int audio_encoder) 399 throws IllegalStateException; 400 401 /** 402 * Sets the video encoder to be used for recording. If this method is not 403 * called, the output file will not contain an video track. Call this after 404 * setOutputFormat() and before prepare(). 405 * 406 * @param video_encoder the video encoder to use. 407 * @throws IllegalStateException if it is called before 408 * setOutputFormat() or after prepare() 409 * @see android.media.MediaRecorder.VideoEncoder 410 */ 411 public native void setVideoEncoder(int video_encoder) 412 throws IllegalStateException; 413 414 /** 415 * Sets the audio sampling rate for recording. Call this method before prepare(). 416 * Prepare() may perform additional checks on the parameter to make sure whether 417 * the specified audio sampling rate is applicable. The sampling rate really depends 418 * on the format for the audio recording, as well as the capabilities of the platform. 419 * For instance, the sampling rate supported by AAC audio coding standard ranges 420 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 421 * supported audio sampling rate. 422 * 423 * @param samplingRate the sampling rate for audio in samples per second. 424 */ 425 public void setAudioSamplingRate(int samplingRate) { 426 if (samplingRate <= 0) { 427 throw new IllegalArgumentException("Audio sampling rate is not positive"); 428 } 429 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 430 } 431 432 /** 433 * Sets the number of audio channels for recording. Call this method before prepare(). 434 * Prepare() may perform additional checks on the parameter to make sure whether the 435 * specified number of audio channels are applicable. 436 * 437 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 438 * (stereo). 439 */ 440 public void setAudioChannels(int numChannels) { 441 if (numChannels <= 0) { 442 throw new IllegalArgumentException("Number of channels is not positive"); 443 } 444 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 445 } 446 447 /** 448 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 449 * Prepare() may perform additional checks on the parameter to make sure whether the 450 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 451 * internally to ensure the audio recording can proceed smoothly based on the 452 * capabilities of the platform. 453 * 454 * @param bitRate the audio encoding bit rate in bits per second. 455 */ 456 public void setAudioEncodingBitRate(int bitRate) { 457 if (bitRate <= 0) { 458 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 459 } 460 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 461 } 462 463 /** 464 * Sets the video encoding bit rate for recording. Call this method before prepare(). 465 * Prepare() may perform additional checks on the parameter to make sure whether the 466 * specified bit rate is applicable, and sometimes the passed bitRate will be 467 * clipped internally to ensure the video recording can proceed smoothly based on 468 * the capabilities of the platform. 469 * 470 * @param bitRate the video encoding bit rate in bits per second. 471 */ 472 public void setVideoEncodingBitRate(int bitRate) { 473 if (bitRate <= 0) { 474 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 475 } 476 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 477 } 478 479 /** 480 * Sets the level of the encoder. Call this before prepare(). 481 * 482 * @param encoderLevel the video encoder level. 483 * @hide 484 */ 485 public void setVideoEncoderLevel(int encoderLevel) { 486 setParameter(String.format("video-param-encoder-level=%d", encoderLevel)); 487 } 488 489 /** 490 * Sets the auxiliary time lapse video's resolution and bitrate. 491 * 492 * The auxiliary video's resolution and bitrate are determined by the CamcorderProfile 493 * quality level {@link android.media.CamcorderProfile#QUALITY_HIGH}. 494 */ 495 private void setAuxVideoParameters() { 496 CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH); 497 setParameter(String.format("video-aux-param-width=%d", profile.videoFrameWidth)); 498 setParameter(String.format("video-aux-param-height=%d", profile.videoFrameHeight)); 499 setParameter(String.format("video-aux-param-encoding-bitrate=%d", profile.videoBitRate)); 500 } 501 502 /** 503 * Pass in the file descriptor for the auxiliary time lapse video. Call this before 504 * prepare(). 505 * 506 * Sets file descriptor and parameters for auxiliary time lapse video. Time lapse mode 507 * can capture video (using the still camera) at resolutions higher than that can be 508 * played back on the device. This function or 509 * {@link #setAuxiliaryOutputFile(String)} enable capture of a smaller video in 510 * parallel with the main time lapse video, which can be used to play back on the 511 * device. The smaller video is created by downsampling the main video. This call is 512 * optional and does not have to be called if parallel capture of a downsampled video 513 * is not desired. 514 * 515 * Note that while the main video resolution and bitrate is determined from the 516 * CamcorderProfile in {@link #setProfile(CamcorderProfile)}, the auxiliary video's 517 * resolution and bitrate are determined by the CamcorderProfile quality level 518 * {@link android.media.CamcorderProfile#QUALITY_HIGH}. All other encoding parameters 519 * remain the same for the main video and the auxiliary video. 520 * 521 * E.g. if the device supports the time lapse profile quality level 522 * {@link android.media.CamcorderProfile#QUALITY_TIME_LAPSE_1080P} but can playback at 523 * most 480p, the application might want to capture an auxiliary video of resolution 524 * 480p using this call. 525 * 526 * @param fd an open file descriptor to be written into. 527 */ 528 public void setAuxiliaryOutputFile(FileDescriptor fd) 529 { 530 mPrepareAuxiliaryFile = true; 531 mPathAux = null; 532 mFdAux = fd; 533 setAuxVideoParameters(); 534 } 535 536 /** 537 * Pass in the file path for the auxiliary time lapse video. Call this before 538 * prepare(). 539 * 540 * Sets file path and parameters for auxiliary time lapse video. Time lapse mode can 541 * capture video (using the still camera) at resolutions higher than that can be 542 * played back on the device. This function or 543 * {@link #setAuxiliaryOutputFile(FileDescriptor)} enable capture of a smaller 544 * video in parallel with the main time lapse video, which can be used to play back on 545 * the device. The smaller video is created by downsampling the main video. This call 546 * is optional and does not have to be called if parallel capture of a downsampled 547 * video is not desired. 548 * 549 * Note that while the main video resolution and bitrate is determined from the 550 * CamcorderProfile in {@link #setProfile(CamcorderProfile)}, the auxiliary video's 551 * resolution and bitrate are determined by the CamcorderProfile quality level 552 * {@link android.media.CamcorderProfile#QUALITY_HIGH}. All other encoding parameters 553 * remain the same for the main video and the auxiliary video. 554 * 555 * E.g. if the device supports the time lapse profile quality level 556 * {@link android.media.CamcorderProfile#QUALITY_TIME_LAPSE_1080P} but can playback at 557 * most 480p, the application might want to capture an auxiliary video of resolution 558 * 480p using this call. 559 * 560 * @param path The pathname to use. 561 */ 562 public void setAuxiliaryOutputFile(String path) 563 { 564 mPrepareAuxiliaryFile = true; 565 mFdAux = null; 566 mPathAux = path; 567 setAuxVideoParameters(); 568 } 569 570 /** 571 * Pass in the file descriptor of the file to be written. Call this after 572 * setOutputFormat() but before prepare(). 573 * 574 * @param fd an open file descriptor to be written into. 575 * @throws IllegalStateException if it is called before 576 * setOutputFormat() or after prepare() 577 */ 578 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 579 { 580 mPath = null; 581 mFd = fd; 582 } 583 584 /** 585 * Sets the path of the output file to be produced. Call this after 586 * setOutputFormat() but before prepare(). 587 * 588 * @param path The pathname to use. 589 * @throws IllegalStateException if it is called before 590 * setOutputFormat() or after prepare() 591 */ 592 public void setOutputFile(String path) throws IllegalStateException 593 { 594 mFd = null; 595 mPath = path; 596 } 597 598 // native implementation 599 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 600 throws IllegalStateException, IOException; 601 private native void _setOutputFileAux(FileDescriptor fd) 602 throws IllegalStateException, IOException; 603 private native void _prepare() throws IllegalStateException, IOException; 604 605 /** 606 * Prepares the recorder to begin capturing and encoding data. This method 607 * must be called after setting up the desired audio and video sources, 608 * encoders, file format, etc., but before start(). 609 * 610 * @throws IllegalStateException if it is called after 611 * start() or before setOutputFormat(). 612 * @throws IOException if prepare fails otherwise. 613 */ 614 public void prepare() throws IllegalStateException, IOException 615 { 616 if (mPath != null) { 617 FileOutputStream fos = new FileOutputStream(mPath); 618 try { 619 _setOutputFile(fos.getFD(), 0, 0); 620 } finally { 621 fos.close(); 622 } 623 } else if (mFd != null) { 624 _setOutputFile(mFd, 0, 0); 625 } else { 626 throw new IOException("No valid output file"); 627 } 628 629 if (mPrepareAuxiliaryFile) { 630 if (mPathAux != null) { 631 FileOutputStream fos = new FileOutputStream(mPathAux); 632 try { 633 _setOutputFileAux(fos.getFD()); 634 } finally { 635 fos.close(); 636 } 637 } else if (mFdAux != null) { 638 _setOutputFileAux(mFdAux); 639 } else { 640 throw new IOException("No valid output file"); 641 } 642 } 643 644 _prepare(); 645 } 646 647 /** 648 * Begins capturing and encoding data to the file specified with 649 * setOutputFile(). Call this after prepare(). 650 * 651 * @throws IllegalStateException if it is called before 652 * prepare(). 653 */ 654 public native void start() throws IllegalStateException; 655 656 /** 657 * Stops recording. Call this after start(). Once recording is stopped, 658 * you will have to configure it again as if it has just been constructed. 659 * 660 * @throws IllegalStateException if it is called before start() 661 */ 662 public native void stop() throws IllegalStateException; 663 664 /** 665 * Restarts the MediaRecorder to its idle state. After calling 666 * this method, you will have to configure it again as if it had just been 667 * constructed. 668 */ 669 public void reset() { 670 native_reset(); 671 672 // make sure none of the listeners get called anymore 673 mEventHandler.removeCallbacksAndMessages(null); 674 } 675 676 private native void native_reset(); 677 678 /** 679 * Returns the maximum absolute amplitude that was sampled since the last 680 * call to this method. Call this only after the setAudioSource(). 681 * 682 * @return the maximum absolute amplitude measured since the last call, or 683 * 0 when called for the first time 684 * @throws IllegalStateException if it is called before 685 * the audio source has been set. 686 */ 687 public native int getMaxAmplitude() throws IllegalStateException; 688 689 /* Do not change this value without updating its counterpart 690 * in include/media/mediarecorder.h! 691 */ 692 /** Unspecified media recorder error. 693 * @see android.media.MediaRecorder.OnErrorListener 694 */ 695 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 696 697 /** 698 * Interface definition for a callback to be invoked when an error 699 * occurs while recording. 700 */ 701 public interface OnErrorListener 702 { 703 /** 704 * Called when an error occurs while recording. 705 * 706 * @param mr the MediaRecorder that encountered the error 707 * @param what the type of error that has occurred: 708 * <ul> 709 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 710 * </ul> 711 * @param extra an extra code, specific to the error type 712 */ 713 void onError(MediaRecorder mr, int what, int extra); 714 } 715 716 /** 717 * Register a callback to be invoked when an error occurs while 718 * recording. 719 * 720 * @param l the callback that will be run 721 */ 722 public void setOnErrorListener(OnErrorListener l) 723 { 724 mOnErrorListener = l; 725 } 726 727 /* Do not change these values without updating their counterparts 728 * in include/media/mediarecorder.h! 729 */ 730 /** Unspecified media recorder error. 731 * @see android.media.MediaRecorder.OnInfoListener 732 */ 733 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 734 /** A maximum duration had been setup and has now been reached. 735 * @see android.media.MediaRecorder.OnInfoListener 736 */ 737 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 738 /** A maximum filesize had been setup and has now been reached. 739 * @see android.media.MediaRecorder.OnInfoListener 740 */ 741 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 742 743 /** 744 * Interface definition for a callback to be invoked when an error 745 * occurs while recording. 746 */ 747 public interface OnInfoListener 748 { 749 /** 750 * Called when an error occurs while recording. 751 * 752 * @param mr the MediaRecorder that encountered the error 753 * @param what the type of error that has occurred: 754 * <ul> 755 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 756 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 757 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 758 * </ul> 759 * @param extra an extra code, specific to the error type 760 */ 761 void onInfo(MediaRecorder mr, int what, int extra); 762 } 763 764 /** 765 * Register a callback to be invoked when an informational event occurs while 766 * recording. 767 * 768 * @param listener the callback that will be run 769 */ 770 public void setOnInfoListener(OnInfoListener listener) 771 { 772 mOnInfoListener = listener; 773 } 774 775 private class EventHandler extends Handler 776 { 777 private MediaRecorder mMediaRecorder; 778 779 public EventHandler(MediaRecorder mr, Looper looper) { 780 super(looper); 781 mMediaRecorder = mr; 782 } 783 784 /* Do not change these values without updating their counterparts 785 * in include/media/mediarecorder.h! 786 */ 787 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 788 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 789 790 @Override 791 public void handleMessage(Message msg) { 792 if (mMediaRecorder.mNativeContext == 0) { 793 Log.w(TAG, "mediarecorder went away with unhandled events"); 794 return; 795 } 796 switch(msg.what) { 797 case MEDIA_RECORDER_EVENT_ERROR: 798 if (mOnErrorListener != null) 799 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 800 801 return; 802 803 case MEDIA_RECORDER_EVENT_INFO: 804 if (mOnInfoListener != null) 805 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 806 807 return; 808 809 default: 810 Log.e(TAG, "Unknown message type " + msg.what); 811 return; 812 } 813 } 814 } 815 816 /** 817 * Called from native code when an interesting event happens. This method 818 * just uses the EventHandler system to post the event back to the main app thread. 819 * We use a weak reference to the original MediaRecorder object so that the native 820 * code is safe from the object disappearing from underneath it. (This is 821 * the cookie passed to native_setup().) 822 */ 823 private static void postEventFromNative(Object mediarecorder_ref, 824 int what, int arg1, int arg2, Object obj) 825 { 826 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 827 if (mr == null) { 828 return; 829 } 830 831 if (mr.mEventHandler != null) { 832 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 833 mr.mEventHandler.sendMessage(m); 834 } 835 } 836 837 /** 838 * Releases resources associated with this MediaRecorder object. 839 * It is good practice to call this method when you're done 840 * using the MediaRecorder. 841 */ 842 public native void release(); 843 844 private static native final void native_init(); 845 846 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 847 848 private native final void native_finalize(); 849 850 private native void setParameter(String nameValuePair); 851 852 @Override 853 protected void finalize() { native_finalize(); } 854} 855