MediaRecorder.java revision 820b9e0d3b6f94fe0b524aebf756ce25df273e6a
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 * @hide 154 * Microphone audio source tuned for voice communications such as VoIP. It 155 * will for instance take advantage of echo cancellation or automatic gain control 156 * if available. It otherwise behaves like {@link #DEFAULT} if no voice processing 157 * is available. 158 */ 159 public static final int VOICE_COMMUNICATION = 7; 160 } 161 162 /** 163 * Defines the video source. These constants are used with 164 * {@link MediaRecorder#setVideoSource(int)}. 165 */ 166 public final class VideoSource { 167 /* Do not change these values without updating their counterparts 168 * in include/media/mediarecorder.h! 169 */ 170 private VideoSource() {} 171 public static final int DEFAULT = 0; 172 /** Camera video source */ 173 public static final int CAMERA = 1; 174 } 175 176 /** 177 * Defines the output format. These constants are used with 178 * {@link MediaRecorder#setOutputFormat(int)}. 179 */ 180 public final class OutputFormat { 181 /* Do not change these values without updating their counterparts 182 * in include/media/mediarecorder.h! 183 */ 184 private OutputFormat() {} 185 public static final int DEFAULT = 0; 186 /** 3GPP media file format*/ 187 public static final int THREE_GPP = 1; 188 /** MPEG4 media file format*/ 189 public static final int MPEG_4 = 2; 190 191 /** The following formats are audio only .aac or .amr formats **/ 192 /** @deprecated Deprecated in favor of AMR_NB */ 193 /** TODO: change link when AMR_NB is exposed. Deprecated in favor of MediaRecorder.OutputFormat.AMR_NB */ 194 public static final int RAW_AMR = 3; 195 /** @hide AMR NB file format */ 196 public static final int AMR_NB = 3; 197 /** @hide AMR WB file format */ 198 public static final int AMR_WB = 4; 199 /** @hide AAC ADIF file format */ 200 public static final int AAC_ADIF = 5; 201 /** @hide AAC ADTS file format */ 202 public static final int AAC_ADTS = 6; 203 204 /** @hide Stream over a socket, limited to a single stream */ 205 public static final int OUTPUT_FORMAT_RTP_AVP = 7; 206 207 /** @hide H.264/AAC data encapsulated in MPEG2/TS */ 208 public static final int OUTPUT_FORMAT_MPEG2TS = 8; 209 }; 210 211 /** 212 * Defines the audio encoding. These constants are used with 213 * {@link MediaRecorder#setAudioEncoder(int)}. 214 */ 215 public final class AudioEncoder { 216 /* Do not change these values without updating their counterparts 217 * in include/media/mediarecorder.h! 218 */ 219 private AudioEncoder() {} 220 public static final int DEFAULT = 0; 221 /** AMR (Narrowband) audio codec */ 222 public static final int AMR_NB = 1; 223 /** @hide AMR (Wideband) audio codec */ 224 public static final int AMR_WB = 2; 225 /** @hide AAC audio codec */ 226 public static final int AAC = 3; 227 /** @hide enhanced AAC audio codec */ 228 public static final int AAC_PLUS = 4; 229 /** @hide enhanced AAC plus audio codec */ 230 public static final int EAAC_PLUS = 5; 231 } 232 233 /** 234 * Defines the video encoding. These constants are used with 235 * {@link MediaRecorder#setVideoEncoder(int)}. 236 */ 237 public final class VideoEncoder { 238 /* Do not change these values without updating their counterparts 239 * in include/media/mediarecorder.h! 240 */ 241 private VideoEncoder() {} 242 public static final int DEFAULT = 0; 243 public static final int H263 = 1; 244 public static final int H264 = 2; 245 public static final int MPEG_4_SP = 3; 246 } 247 248 /** 249 * Sets the audio source to be used for recording. If this method is not 250 * called, the output file will not contain an audio track. The source needs 251 * to be specified before setting recording-parameters or encoders. Call 252 * this only before setOutputFormat(). 253 * 254 * @param audio_source the audio source to use 255 * @throws IllegalStateException if it is called after setOutputFormat() 256 * @see android.media.MediaRecorder.AudioSource 257 */ 258 public native void setAudioSource(int audio_source) 259 throws IllegalStateException; 260 261 /** 262 * Gets the maximum value for audio sources. 263 * @see android.media.MediaRecorder.AudioSource 264 */ 265 public static final int getAudioSourceMax() { return AudioSource.VOICE_COMMUNICATION; } 266 267 /** 268 * Sets the video source to be used for recording. If this method is not 269 * called, the output file will not contain an video track. The source needs 270 * to be specified before setting recording-parameters or encoders. Call 271 * this only before setOutputFormat(). 272 * 273 * @param video_source the video source to use 274 * @throws IllegalStateException if it is called after setOutputFormat() 275 * @see android.media.MediaRecorder.VideoSource 276 */ 277 public native void setVideoSource(int video_source) 278 throws IllegalStateException; 279 280 /** 281 * Uses the settings from a CamcorderProfile object for recording. This method should 282 * be called after the video AND audio sources are set, and before setOutputFile(). 283 * 284 * @param profile the CamcorderProfile to use 285 * @see android.media.CamcorderProfile 286 */ 287 public void setProfile(CamcorderProfile profile) { 288 setOutputFormat(profile.fileFormat); 289 setVideoFrameRate(profile.videoFrameRate); 290 setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight); 291 setVideoEncodingBitRate(profile.videoBitRate); 292 setVideoEncoder(profile.videoCodec); 293 if (profile.quality >= CamcorderProfile.QUALITY_TIME_LAPSE_LOW && 294 profile.quality <= CamcorderProfile.QUALITY_TIME_LAPSE_1080P) { 295 // Enable time lapse. Also don't set audio for time lapse. 296 setParameter(String.format("time-lapse-enable=1")); 297 } else { 298 setAudioEncodingBitRate(profile.audioBitRate); 299 setAudioChannels(profile.audioChannels); 300 setAudioSamplingRate(profile.audioSampleRate); 301 setAudioEncoder(profile.audioCodec); 302 } 303 } 304 305 /** 306 * Set video frame capture rate. This can be used to set a different video frame capture 307 * rate than the recorded video's playback rate. Currently this works only for time lapse mode. 308 * 309 * @param fps Rate at which frames should be captured in frames per second. 310 * The fps can go as low as desired. However the fastest fps will be limited by the hardware. 311 * For resolutions that can be captured by the video camera, the fastest fps can be computed using 312 * {@link android.hardware.Camera.Parameters#getPreviewFpsRange(int[])}. For higher 313 * resolutions the fastest fps may be more restrictive. 314 * Note that the recorder cannot guarantee that frames will be captured at the 315 * given rate due to camera/encoder limitations. However it tries to be as close as 316 * possible. 317 */ 318 public void setCaptureRate(double fps) { 319 double timeBetweenFrameCapture = 1 / fps; 320 int timeBetweenFrameCaptureMs = (int) (1000 * timeBetweenFrameCapture); 321 setParameter(String.format("time-between-time-lapse-frame-capture=%d", 322 timeBetweenFrameCaptureMs)); 323 } 324 325 /** 326 * Sets the orientation hint for output video playback. 327 * This method should be called before prepare(). This method will not 328 * trigger the source video frame to rotate during video recording, but to 329 * add a composition matrix containing the rotation angle in the output 330 * video if the output format is OutputFormat.THREE_GPP or 331 * OutputFormat.MPEG_4 so that a video player can choose the proper 332 * orientation for playback. Note that some video players may choose 333 * to ignore the compostion matrix in a video during playback. 334 * 335 * @param degrees the angle to be rotated clockwise in degrees. 336 * The supported angles are 0, 90, 180, and 270 degrees. 337 * @throws IllegalArgumentException if the angle is not supported. 338 * 339 */ 340 public void setOrientationHint(int degrees) { 341 if (degrees != 0 && 342 degrees != 90 && 343 degrees != 180 && 344 degrees != 270) { 345 throw new IllegalArgumentException("Unsupported angle: " + degrees); 346 } 347 setParameter(String.format("video-param-rotation-angle-degrees=%d", degrees)); 348 } 349 350 /** 351 * Sets the format of the output file produced during recording. Call this 352 * after setAudioSource()/setVideoSource() but before prepare(). 353 * 354 * <p>It is recommended to always use 3GP format when using the H.263 355 * video encoder and AMR audio encoder. Using an MPEG-4 container format 356 * may confuse some desktop players.</p> 357 * 358 * @param output_format the output format to use. The output format 359 * needs to be specified before setting recording-parameters or encoders. 360 * @throws IllegalStateException if it is called after prepare() or before 361 * setAudioSource()/setVideoSource(). 362 * @see android.media.MediaRecorder.OutputFormat 363 */ 364 public native void setOutputFormat(int output_format) 365 throws IllegalStateException; 366 367 /** 368 * Sets the width and height of the video to be captured. Must be called 369 * after setVideoSource(). Call this after setOutFormat() but before 370 * prepare(). 371 * 372 * @param width the width of the video to be captured 373 * @param height the height of the video to be captured 374 * @throws IllegalStateException if it is called after 375 * prepare() or before setOutputFormat() 376 */ 377 public native void setVideoSize(int width, int height) 378 throws IllegalStateException; 379 380 /** 381 * Sets the frame rate of the video to be captured. Must be called 382 * after setVideoSource(). Call this after setOutFormat() but before 383 * prepare(). 384 * 385 * @param rate the number of frames per second of video to capture 386 * @throws IllegalStateException if it is called after 387 * prepare() or before setOutputFormat(). 388 * 389 * NOTE: On some devices that have auto-frame rate, this sets the 390 * maximum frame rate, not a constant frame rate. Actual frame rate 391 * will vary according to lighting conditions. 392 */ 393 public native void setVideoFrameRate(int rate) throws IllegalStateException; 394 395 /** 396 * Sets the maximum duration (in ms) of the recording session. 397 * Call this after setOutFormat() but before prepare(). 398 * After recording reaches the specified duration, a notification 399 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 400 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 401 * and recording will be stopped. Stopping happens asynchronously, there 402 * is no guarantee that the recorder will have stopped by the time the 403 * listener is notified. 404 * 405 * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 406 * 407 */ 408 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 409 410 /** 411 * Sets the maximum filesize (in bytes) of the recording session. 412 * Call this after setOutFormat() but before prepare(). 413 * After recording reaches the specified filesize, a notification 414 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 415 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 416 * and recording will be stopped. Stopping happens asynchronously, there 417 * is no guarantee that the recorder will have stopped by the time the 418 * listener is notified. 419 * 420 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 421 * 422 */ 423 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 424 425 /** 426 * Sets the audio encoder to be used for recording. If this method is not 427 * called, the output file will not contain an audio track. Call this after 428 * setOutputFormat() but before prepare(). 429 * 430 * @param audio_encoder the audio encoder to use. 431 * @throws IllegalStateException if it is called before 432 * setOutputFormat() or after prepare(). 433 * @see android.media.MediaRecorder.AudioEncoder 434 */ 435 public native void setAudioEncoder(int audio_encoder) 436 throws IllegalStateException; 437 438 /** 439 * Sets the video encoder to be used for recording. If this method is not 440 * called, the output file will not contain an video track. Call this after 441 * setOutputFormat() and before prepare(). 442 * 443 * @param video_encoder the video encoder to use. 444 * @throws IllegalStateException if it is called before 445 * setOutputFormat() or after prepare() 446 * @see android.media.MediaRecorder.VideoEncoder 447 */ 448 public native void setVideoEncoder(int video_encoder) 449 throws IllegalStateException; 450 451 /** 452 * Sets the audio sampling rate for recording. Call this method before prepare(). 453 * Prepare() may perform additional checks on the parameter to make sure whether 454 * the specified audio sampling rate is applicable. The sampling rate really depends 455 * on the format for the audio recording, as well as the capabilities of the platform. 456 * For instance, the sampling rate supported by AAC audio coding standard ranges 457 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 458 * supported audio sampling rate. 459 * 460 * @param samplingRate the sampling rate for audio in samples per second. 461 */ 462 public void setAudioSamplingRate(int samplingRate) { 463 if (samplingRate <= 0) { 464 throw new IllegalArgumentException("Audio sampling rate is not positive"); 465 } 466 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 467 } 468 469 /** 470 * Sets the number of audio channels for recording. Call this method before prepare(). 471 * Prepare() may perform additional checks on the parameter to make sure whether the 472 * specified number of audio channels are applicable. 473 * 474 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 475 * (stereo). 476 */ 477 public void setAudioChannels(int numChannels) { 478 if (numChannels <= 0) { 479 throw new IllegalArgumentException("Number of channels is not positive"); 480 } 481 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 482 } 483 484 /** 485 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 486 * Prepare() may perform additional checks on the parameter to make sure whether the 487 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 488 * internally to ensure the audio recording can proceed smoothly based on the 489 * capabilities of the platform. 490 * 491 * @param bitRate the audio encoding bit rate in bits per second. 492 */ 493 public void setAudioEncodingBitRate(int bitRate) { 494 if (bitRate <= 0) { 495 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 496 } 497 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 498 } 499 500 /** 501 * Sets the video encoding bit rate for recording. Call this method before prepare(). 502 * Prepare() may perform additional checks on the parameter to make sure whether the 503 * specified bit rate is applicable, and sometimes the passed bitRate will be 504 * clipped internally to ensure the video recording can proceed smoothly based on 505 * the capabilities of the platform. 506 * 507 * @param bitRate the video encoding bit rate in bits per second. 508 */ 509 public void setVideoEncodingBitRate(int bitRate) { 510 if (bitRate <= 0) { 511 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 512 } 513 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 514 } 515 516 /** 517 * Sets the auxiliary time lapse video's resolution and bitrate. 518 * 519 * The auxiliary video's resolution and bitrate are determined by the CamcorderProfile 520 * quality level {@link android.media.CamcorderProfile#QUALITY_HIGH}. 521 */ 522 private void setAuxVideoParameters() { 523 CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH); 524 setParameter(String.format("video-aux-param-width=%d", profile.videoFrameWidth)); 525 setParameter(String.format("video-aux-param-height=%d", profile.videoFrameHeight)); 526 setParameter(String.format("video-aux-param-encoding-bitrate=%d", profile.videoBitRate)); 527 } 528 529 /** 530 * Pass in the file descriptor for the auxiliary time lapse video. Call this before 531 * prepare(). 532 * 533 * Sets file descriptor and parameters for auxiliary time lapse video. Time lapse mode 534 * can capture video (using the still camera) at resolutions higher than that can be 535 * played back on the device. This function or 536 * {@link #setAuxiliaryOutputFile(String)} enable capture of a smaller video in 537 * parallel with the main time lapse video, which can be used to play back on the 538 * device. The smaller video is created by downsampling the main video. This call is 539 * optional and does not have to be called if parallel capture of a downsampled video 540 * is not desired. 541 * 542 * Note that while the main video resolution and bitrate is determined from the 543 * CamcorderProfile in {@link #setProfile(CamcorderProfile)}, the auxiliary video's 544 * resolution and bitrate are determined by the CamcorderProfile quality level 545 * {@link android.media.CamcorderProfile#QUALITY_HIGH}. All other encoding parameters 546 * remain the same for the main video and the auxiliary video. 547 * 548 * E.g. if the device supports the time lapse profile quality level 549 * {@link android.media.CamcorderProfile#QUALITY_TIME_LAPSE_1080P} but can playback at 550 * most 480p, the application might want to capture an auxiliary video of resolution 551 * 480p using this call. 552 * 553 * @param fd an open file descriptor to be written into. 554 */ 555 public void setAuxiliaryOutputFile(FileDescriptor fd) 556 { 557 mPrepareAuxiliaryFile = true; 558 mPathAux = null; 559 mFdAux = fd; 560 setAuxVideoParameters(); 561 } 562 563 /** 564 * Pass in the file path for the auxiliary time lapse video. Call this before 565 * prepare(). 566 * 567 * Sets file path and parameters for auxiliary time lapse video. Time lapse mode can 568 * capture video (using the still camera) at resolutions higher than that can be 569 * played back on the device. This function or 570 * {@link #setAuxiliaryOutputFile(FileDescriptor)} enable capture of a smaller 571 * video in parallel with the main time lapse video, which can be used to play back on 572 * the device. The smaller video is created by downsampling the main video. This call 573 * is optional and does not have to be called if parallel capture of a downsampled 574 * video is not desired. 575 * 576 * Note that while the main video resolution and bitrate is determined from the 577 * CamcorderProfile in {@link #setProfile(CamcorderProfile)}, the auxiliary video's 578 * resolution and bitrate are determined by the CamcorderProfile quality level 579 * {@link android.media.CamcorderProfile#QUALITY_HIGH}. All other encoding parameters 580 * remain the same for the main video and the auxiliary video. 581 * 582 * E.g. if the device supports the time lapse profile quality level 583 * {@link android.media.CamcorderProfile#QUALITY_TIME_LAPSE_1080P} but can playback at 584 * most 480p, the application might want to capture an auxiliary video of resolution 585 * 480p using this call. 586 * 587 * @param path The pathname to use. 588 */ 589 public void setAuxiliaryOutputFile(String path) 590 { 591 mPrepareAuxiliaryFile = true; 592 mFdAux = null; 593 mPathAux = path; 594 setAuxVideoParameters(); 595 } 596 597 /** 598 * Pass in the file descriptor of the file to be written. Call this after 599 * setOutputFormat() but before prepare(). 600 * 601 * @param fd an open file descriptor to be written into. 602 * @throws IllegalStateException if it is called before 603 * setOutputFormat() or after prepare() 604 */ 605 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 606 { 607 mPath = null; 608 mFd = fd; 609 } 610 611 /** 612 * Sets the path of the output file to be produced. Call this after 613 * setOutputFormat() but before prepare(). 614 * 615 * @param path The pathname to use. 616 * @throws IllegalStateException if it is called before 617 * setOutputFormat() or after prepare() 618 */ 619 public void setOutputFile(String path) throws IllegalStateException 620 { 621 mFd = null; 622 mPath = path; 623 } 624 625 // native implementation 626 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 627 throws IllegalStateException, IOException; 628 private native void _setOutputFileAux(FileDescriptor fd) 629 throws IllegalStateException, IOException; 630 private native void _prepare() throws IllegalStateException, IOException; 631 632 /** 633 * Prepares the recorder to begin capturing and encoding data. This method 634 * must be called after setting up the desired audio and video sources, 635 * encoders, file format, etc., but before start(). 636 * 637 * @throws IllegalStateException if it is called after 638 * start() or before setOutputFormat(). 639 * @throws IOException if prepare fails otherwise. 640 */ 641 public void prepare() throws IllegalStateException, IOException 642 { 643 if (mPath != null) { 644 FileOutputStream fos = new FileOutputStream(mPath); 645 try { 646 _setOutputFile(fos.getFD(), 0, 0); 647 } finally { 648 fos.close(); 649 } 650 } else if (mFd != null) { 651 _setOutputFile(mFd, 0, 0); 652 } else { 653 throw new IOException("No valid output file"); 654 } 655 656 if (mPrepareAuxiliaryFile) { 657 if (mPathAux != null) { 658 FileOutputStream fos = new FileOutputStream(mPathAux); 659 try { 660 _setOutputFileAux(fos.getFD()); 661 } finally { 662 fos.close(); 663 } 664 } else if (mFdAux != null) { 665 _setOutputFileAux(mFdAux); 666 } else { 667 throw new IOException("No valid output file"); 668 } 669 } 670 671 _prepare(); 672 } 673 674 /** 675 * Begins capturing and encoding data to the file specified with 676 * setOutputFile(). Call this after prepare(). 677 * 678 * @throws IllegalStateException if it is called before 679 * prepare(). 680 */ 681 public native void start() throws IllegalStateException; 682 683 /** 684 * Stops recording. Call this after start(). Once recording is stopped, 685 * you will have to configure it again as if it has just been constructed. 686 * 687 * @throws IllegalStateException if it is called before start() 688 */ 689 public native void stop() throws IllegalStateException; 690 691 /** 692 * Restarts the MediaRecorder to its idle state. After calling 693 * this method, you will have to configure it again as if it had just been 694 * constructed. 695 */ 696 public void reset() { 697 native_reset(); 698 699 // make sure none of the listeners get called anymore 700 mEventHandler.removeCallbacksAndMessages(null); 701 } 702 703 private native void native_reset(); 704 705 /** 706 * Returns the maximum absolute amplitude that was sampled since the last 707 * call to this method. Call this only after the setAudioSource(). 708 * 709 * @return the maximum absolute amplitude measured since the last call, or 710 * 0 when called for the first time 711 * @throws IllegalStateException if it is called before 712 * the audio source has been set. 713 */ 714 public native int getMaxAmplitude() throws IllegalStateException; 715 716 /* Do not change this value without updating its counterpart 717 * in include/media/mediarecorder.h! 718 */ 719 /** Unspecified media recorder error. 720 * @see android.media.MediaRecorder.OnErrorListener 721 */ 722 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 723 724 /** 725 * Interface definition for a callback to be invoked when an error 726 * occurs while recording. 727 */ 728 public interface OnErrorListener 729 { 730 /** 731 * Called when an error occurs while recording. 732 * 733 * @param mr the MediaRecorder that encountered the error 734 * @param what the type of error that has occurred: 735 * <ul> 736 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 737 * </ul> 738 * @param extra an extra code, specific to the error type 739 */ 740 void onError(MediaRecorder mr, int what, int extra); 741 } 742 743 /** 744 * Register a callback to be invoked when an error occurs while 745 * recording. 746 * 747 * @param l the callback that will be run 748 */ 749 public void setOnErrorListener(OnErrorListener l) 750 { 751 mOnErrorListener = l; 752 } 753 754 /* Do not change these values without updating their counterparts 755 * in include/media/mediarecorder.h! 756 */ 757 /** Unspecified media recorder error. 758 * @see android.media.MediaRecorder.OnInfoListener 759 */ 760 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 761 /** A maximum duration had been setup and has now been reached. 762 * @see android.media.MediaRecorder.OnInfoListener 763 */ 764 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 765 /** A maximum filesize had been setup and has now been reached. 766 * @see android.media.MediaRecorder.OnInfoListener 767 */ 768 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 769 770 /** 771 * Interface definition for a callback to be invoked when an error 772 * occurs while recording. 773 */ 774 public interface OnInfoListener 775 { 776 /** 777 * Called when an error occurs while recording. 778 * 779 * @param mr the MediaRecorder that encountered the error 780 * @param what the type of error that has occurred: 781 * <ul> 782 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 783 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 784 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 785 * </ul> 786 * @param extra an extra code, specific to the error type 787 */ 788 void onInfo(MediaRecorder mr, int what, int extra); 789 } 790 791 /** 792 * Register a callback to be invoked when an informational event occurs while 793 * recording. 794 * 795 * @param listener the callback that will be run 796 */ 797 public void setOnInfoListener(OnInfoListener listener) 798 { 799 mOnInfoListener = listener; 800 } 801 802 private class EventHandler extends Handler 803 { 804 private MediaRecorder mMediaRecorder; 805 806 public EventHandler(MediaRecorder mr, Looper looper) { 807 super(looper); 808 mMediaRecorder = mr; 809 } 810 811 /* Do not change these values without updating their counterparts 812 * in include/media/mediarecorder.h! 813 */ 814 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 815 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 816 817 @Override 818 public void handleMessage(Message msg) { 819 if (mMediaRecorder.mNativeContext == 0) { 820 Log.w(TAG, "mediarecorder went away with unhandled events"); 821 return; 822 } 823 switch(msg.what) { 824 case MEDIA_RECORDER_EVENT_ERROR: 825 if (mOnErrorListener != null) 826 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 827 828 return; 829 830 case MEDIA_RECORDER_EVENT_INFO: 831 if (mOnInfoListener != null) 832 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 833 834 return; 835 836 default: 837 Log.e(TAG, "Unknown message type " + msg.what); 838 return; 839 } 840 } 841 } 842 843 /** 844 * Called from native code when an interesting event happens. This method 845 * just uses the EventHandler system to post the event back to the main app thread. 846 * We use a weak reference to the original MediaRecorder object so that the native 847 * code is safe from the object disappearing from underneath it. (This is 848 * the cookie passed to native_setup().) 849 */ 850 private static void postEventFromNative(Object mediarecorder_ref, 851 int what, int arg1, int arg2, Object obj) 852 { 853 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 854 if (mr == null) { 855 return; 856 } 857 858 if (mr.mEventHandler != null) { 859 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 860 mr.mEventHandler.sendMessage(m); 861 } 862 } 863 864 /** 865 * Releases resources associated with this MediaRecorder object. 866 * It is good practice to call this method when you're done 867 * using the MediaRecorder. 868 */ 869 public native void release(); 870 871 private static native final void native_init(); 872 873 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 874 875 private native final void native_finalize(); 876 877 private native void setParameter(String nameValuePair); 878 879 @Override 880 protected void finalize() { native_finalize(); } 881} 882