MediaRecorder.java revision 4a90f93781622e5cbca52b962cfe5325a29ec28e
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 /** @hide H.264/AAC data encapsulated in MPEG2/TS */ 199 public static final int OUTPUT_FORMAT_MPEG2TS = 8; 200 }; 201 202 /** 203 * Defines the audio encoding. These constants are used with 204 * {@link MediaRecorder#setAudioEncoder(int)}. 205 */ 206 public final class AudioEncoder { 207 /* Do not change these values without updating their counterparts 208 * in include/media/mediarecorder.h! 209 */ 210 private AudioEncoder() {} 211 public static final int DEFAULT = 0; 212 /** AMR (Narrowband) audio codec */ 213 public static final int AMR_NB = 1; 214 /** @hide AMR (Wideband) audio codec */ 215 public static final int AMR_WB = 2; 216 /** @hide AAC audio codec */ 217 public static final int AAC = 3; 218 /** @hide enhanced AAC audio codec */ 219 public static final int AAC_PLUS = 4; 220 /** @hide enhanced AAC plus audio codec */ 221 public static final int EAAC_PLUS = 5; 222 } 223 224 /** 225 * Defines the video encoding. These constants are used with 226 * {@link MediaRecorder#setVideoEncoder(int)}. 227 */ 228 public final class VideoEncoder { 229 /* Do not change these values without updating their counterparts 230 * in include/media/mediarecorder.h! 231 */ 232 private VideoEncoder() {} 233 public static final int DEFAULT = 0; 234 public static final int H263 = 1; 235 public static final int H264 = 2; 236 public static final int MPEG_4_SP = 3; 237 } 238 239 /** 240 * Sets the audio source to be used for recording. If this method is not 241 * called, the output file will not contain an audio track. The source needs 242 * to be specified before setting recording-parameters or encoders. Call 243 * this only before setOutputFormat(). 244 * 245 * @param audio_source the audio source to use 246 * @throws IllegalStateException if it is called after setOutputFormat() 247 * @see android.media.MediaRecorder.AudioSource 248 */ 249 public native void setAudioSource(int audio_source) 250 throws IllegalStateException; 251 252 /** 253 * Gets the maximum value for audio sources. 254 * @see android.media.MediaRecorder.AudioSource 255 */ 256 public static final int getAudioSourceMax() { return AudioSource.VOICE_RECOGNITION; } 257 258 /** 259 * Sets the video source to be used for recording. If this method is not 260 * called, the output file will not contain an video track. The source needs 261 * to be specified before setting recording-parameters or encoders. Call 262 * this only before setOutputFormat(). 263 * 264 * @param video_source the video source to use 265 * @throws IllegalStateException if it is called after setOutputFormat() 266 * @see android.media.MediaRecorder.VideoSource 267 */ 268 public native void setVideoSource(int video_source) 269 throws IllegalStateException; 270 271 /** 272 * Uses the settings from a CamcorderProfile object for recording. This method should 273 * be called after the video AND audio sources are set, and before setOutputFile(). 274 * 275 * @param profile the CamcorderProfile to use 276 * @see android.media.CamcorderProfile 277 */ 278 public void setProfile(CamcorderProfile profile) { 279 setOutputFormat(profile.fileFormat); 280 setVideoFrameRate(profile.videoFrameRate); 281 setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight); 282 setVideoEncodingBitRate(profile.videoBitRate); 283 setVideoEncoder(profile.videoCodec); 284 if (profile.quality >= CamcorderProfile.QUALITY_TIME_LAPSE_LOW && 285 profile.quality <= CamcorderProfile.QUALITY_TIME_LAPSE_1080P) { 286 // Enable time lapse. Also don't set audio for time lapse. 287 setParameter(String.format("time-lapse-enable=1")); 288 } else { 289 setAudioEncodingBitRate(profile.audioBitRate); 290 setAudioChannels(profile.audioChannels); 291 setAudioSamplingRate(profile.audioSampleRate); 292 setAudioEncoder(profile.audioCodec); 293 } 294 } 295 296 /** 297 * Set video frame capture rate. This can be used to set a different video frame capture 298 * rate than the recorded video's playback rate. Currently this works only for time lapse mode. 299 * 300 * @param fps Rate at which frames should be captured in frames per second. 301 * The fps can go as low as desired. However the fastest fps will be limited by the hardware. 302 * For resolutions that can be captured by the video camera, the fastest fps can be computed using 303 * {@link android.hardware.Camera.Parameters#getPreviewFpsRange(int[])}. For higher 304 * resolutions the fastest fps may be more restrictive. 305 * Note that the recorder cannot guarantee that frames will be captured at the 306 * given rate due to camera/encoder limitations. However it tries to be as close as 307 * possible. 308 */ 309 public void setCaptureRate(double fps) { 310 double timeBetweenFrameCapture = 1 / fps; 311 int timeBetweenFrameCaptureMs = (int) (1000 * timeBetweenFrameCapture); 312 setParameter(String.format("time-between-time-lapse-frame-capture=%d", 313 timeBetweenFrameCaptureMs)); 314 } 315 316 /** 317 * Sets the format of the output file produced during recording. Call this 318 * after setAudioSource()/setVideoSource() but before prepare(). 319 * 320 * <p>It is recommended to always use 3GP format when using the H.263 321 * video encoder and AMR audio encoder. Using an MPEG-4 container format 322 * may confuse some desktop players.</p> 323 * 324 * @param output_format the output format to use. The output format 325 * needs to be specified before setting recording-parameters or encoders. 326 * @throws IllegalStateException if it is called after prepare() or before 327 * setAudioSource()/setVideoSource(). 328 * @see android.media.MediaRecorder.OutputFormat 329 */ 330 public native void setOutputFormat(int output_format) 331 throws IllegalStateException; 332 333 /** 334 * Sets the width and height of the video to be captured. Must be called 335 * after setVideoSource(). Call this after setOutFormat() but before 336 * prepare(). 337 * 338 * @param width the width of the video to be captured 339 * @param height the height of the video to be captured 340 * @throws IllegalStateException if it is called after 341 * prepare() or before setOutputFormat() 342 */ 343 public native void setVideoSize(int width, int height) 344 throws IllegalStateException; 345 346 /** 347 * Sets the frame rate of the video to be captured. Must be called 348 * after setVideoSource(). Call this after setOutFormat() but before 349 * prepare(). 350 * 351 * @param rate the number of frames per second of video to capture 352 * @throws IllegalStateException if it is called after 353 * prepare() or before setOutputFormat(). 354 * 355 * NOTE: On some devices that have auto-frame rate, this sets the 356 * maximum frame rate, not a constant frame rate. Actual frame rate 357 * will vary according to lighting conditions. 358 */ 359 public native void setVideoFrameRate(int rate) throws IllegalStateException; 360 361 /** 362 * Sets the maximum duration (in ms) of the recording session. 363 * Call this after setOutFormat() but before prepare(). 364 * After recording reaches the specified duration, a notification 365 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 366 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 367 * and recording will be stopped. Stopping happens asynchronously, there 368 * is no guarantee that the recorder will have stopped by the time the 369 * listener is notified. 370 * 371 * @param max_duration_ms the maximum duration in ms (if zero or negative, disables the duration limit) 372 * 373 */ 374 public native void setMaxDuration(int max_duration_ms) throws IllegalArgumentException; 375 376 /** 377 * Sets the maximum filesize (in bytes) of the recording session. 378 * Call this after setOutFormat() but before prepare(). 379 * After recording reaches the specified filesize, a notification 380 * will be sent to the {@link android.media.MediaRecorder.OnInfoListener} 381 * with a "what" code of {@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 382 * and recording will be stopped. Stopping happens asynchronously, there 383 * is no guarantee that the recorder will have stopped by the time the 384 * listener is notified. 385 * 386 * @param max_filesize_bytes the maximum filesize in bytes (if zero or negative, disables the limit) 387 * 388 */ 389 public native void setMaxFileSize(long max_filesize_bytes) throws IllegalArgumentException; 390 391 /** 392 * Sets the audio encoder to be used for recording. If this method is not 393 * called, the output file will not contain an audio track. Call this after 394 * setOutputFormat() but before prepare(). 395 * 396 * @param audio_encoder the audio encoder to use. 397 * @throws IllegalStateException if it is called before 398 * setOutputFormat() or after prepare(). 399 * @see android.media.MediaRecorder.AudioEncoder 400 */ 401 public native void setAudioEncoder(int audio_encoder) 402 throws IllegalStateException; 403 404 /** 405 * Sets the video encoder to be used for recording. If this method is not 406 * called, the output file will not contain an video track. Call this after 407 * setOutputFormat() and before prepare(). 408 * 409 * @param video_encoder the video encoder to use. 410 * @throws IllegalStateException if it is called before 411 * setOutputFormat() or after prepare() 412 * @see android.media.MediaRecorder.VideoEncoder 413 */ 414 public native void setVideoEncoder(int video_encoder) 415 throws IllegalStateException; 416 417 /** 418 * Sets the audio sampling rate for recording. Call this method before prepare(). 419 * Prepare() may perform additional checks on the parameter to make sure whether 420 * the specified audio sampling rate is applicable. The sampling rate really depends 421 * on the format for the audio recording, as well as the capabilities of the platform. 422 * For instance, the sampling rate supported by AAC audio coding standard ranges 423 * from 8 to 96 kHz. Please consult with the related audio coding standard for the 424 * supported audio sampling rate. 425 * 426 * @param samplingRate the sampling rate for audio in samples per second. 427 */ 428 public void setAudioSamplingRate(int samplingRate) { 429 if (samplingRate <= 0) { 430 throw new IllegalArgumentException("Audio sampling rate is not positive"); 431 } 432 setParameter(String.format("audio-param-sampling-rate=%d", samplingRate)); 433 } 434 435 /** 436 * Sets the number of audio channels for recording. Call this method before prepare(). 437 * Prepare() may perform additional checks on the parameter to make sure whether the 438 * specified number of audio channels are applicable. 439 * 440 * @param numChannels the number of audio channels. Usually it is either 1 (mono) or 2 441 * (stereo). 442 */ 443 public void setAudioChannels(int numChannels) { 444 if (numChannels <= 0) { 445 throw new IllegalArgumentException("Number of channels is not positive"); 446 } 447 setParameter(String.format("audio-param-number-of-channels=%d", numChannels)); 448 } 449 450 /** 451 * Sets the audio encoding bit rate for recording. Call this method before prepare(). 452 * Prepare() may perform additional checks on the parameter to make sure whether the 453 * specified bit rate is applicable, and sometimes the passed bitRate will be clipped 454 * internally to ensure the audio recording can proceed smoothly based on the 455 * capabilities of the platform. 456 * 457 * @param bitRate the audio encoding bit rate in bits per second. 458 */ 459 public void setAudioEncodingBitRate(int bitRate) { 460 if (bitRate <= 0) { 461 throw new IllegalArgumentException("Audio encoding bit rate is not positive"); 462 } 463 setParameter(String.format("audio-param-encoding-bitrate=%d", bitRate)); 464 } 465 466 /** 467 * Sets the video encoding bit rate for recording. Call this method before prepare(). 468 * Prepare() may perform additional checks on the parameter to make sure whether the 469 * specified bit rate is applicable, and sometimes the passed bitRate will be 470 * clipped internally to ensure the video recording can proceed smoothly based on 471 * the capabilities of the platform. 472 * 473 * @param bitRate the video encoding bit rate in bits per second. 474 */ 475 public void setVideoEncodingBitRate(int bitRate) { 476 if (bitRate <= 0) { 477 throw new IllegalArgumentException("Video encoding bit rate is not positive"); 478 } 479 setParameter(String.format("video-param-encoding-bitrate=%d", bitRate)); 480 } 481 482 /** 483 * Sets the level of the encoder. Call this before prepare(). 484 * 485 * @param encoderLevel the video encoder level. 486 * @hide 487 */ 488 public void setVideoEncoderLevel(int encoderLevel) { 489 setParameter(String.format("video-param-encoder-level=%d", encoderLevel)); 490 } 491 492 /** 493 * Sets the auxiliary time lapse video's resolution and bitrate. 494 * 495 * The auxiliary video's resolution and bitrate are determined by the CamcorderProfile 496 * quality level {@link android.media.CamcorderProfile#QUALITY_HIGH}. 497 */ 498 private void setAuxVideoParameters() { 499 CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH); 500 setParameter(String.format("video-aux-param-width=%d", profile.videoFrameWidth)); 501 setParameter(String.format("video-aux-param-height=%d", profile.videoFrameHeight)); 502 setParameter(String.format("video-aux-param-encoding-bitrate=%d", profile.videoBitRate)); 503 } 504 505 /** 506 * Pass in the file descriptor for the auxiliary time lapse video. Call this before 507 * prepare(). 508 * 509 * Sets file descriptor and parameters for auxiliary time lapse video. Time lapse mode 510 * can capture video (using the still camera) at resolutions higher than that can be 511 * played back on the device. This function or 512 * {@link #setAuxiliaryOutputFile(String)} enable capture of a smaller video in 513 * parallel with the main time lapse video, which can be used to play back on the 514 * device. The smaller video is created by downsampling the main video. This call is 515 * optional and does not have to be called if parallel capture of a downsampled video 516 * is not desired. 517 * 518 * Note that while the main video resolution and bitrate is determined from the 519 * CamcorderProfile in {@link #setProfile(CamcorderProfile)}, the auxiliary video's 520 * resolution and bitrate are determined by the CamcorderProfile quality level 521 * {@link android.media.CamcorderProfile#QUALITY_HIGH}. All other encoding parameters 522 * remain the same for the main video and the auxiliary video. 523 * 524 * E.g. if the device supports the time lapse profile quality level 525 * {@link android.media.CamcorderProfile#QUALITY_TIME_LAPSE_1080P} but can playback at 526 * most 480p, the application might want to capture an auxiliary video of resolution 527 * 480p using this call. 528 * 529 * @param fd an open file descriptor to be written into. 530 */ 531 public void setAuxiliaryOutputFile(FileDescriptor fd) 532 { 533 mPrepareAuxiliaryFile = true; 534 mPathAux = null; 535 mFdAux = fd; 536 setAuxVideoParameters(); 537 } 538 539 /** 540 * Pass in the file path for the auxiliary time lapse video. Call this before 541 * prepare(). 542 * 543 * Sets file path and parameters for auxiliary time lapse video. Time lapse mode can 544 * capture video (using the still camera) at resolutions higher than that can be 545 * played back on the device. This function or 546 * {@link #setAuxiliaryOutputFile(FileDescriptor)} enable capture of a smaller 547 * video in parallel with the main time lapse video, which can be used to play back on 548 * the device. The smaller video is created by downsampling the main video. This call 549 * is optional and does not have to be called if parallel capture of a downsampled 550 * video is not desired. 551 * 552 * Note that while the main video resolution and bitrate is determined from the 553 * CamcorderProfile in {@link #setProfile(CamcorderProfile)}, the auxiliary video's 554 * resolution and bitrate are determined by the CamcorderProfile quality level 555 * {@link android.media.CamcorderProfile#QUALITY_HIGH}. All other encoding parameters 556 * remain the same for the main video and the auxiliary video. 557 * 558 * E.g. if the device supports the time lapse profile quality level 559 * {@link android.media.CamcorderProfile#QUALITY_TIME_LAPSE_1080P} but can playback at 560 * most 480p, the application might want to capture an auxiliary video of resolution 561 * 480p using this call. 562 * 563 * @param path The pathname to use. 564 */ 565 public void setAuxiliaryOutputFile(String path) 566 { 567 mPrepareAuxiliaryFile = true; 568 mFdAux = null; 569 mPathAux = path; 570 setAuxVideoParameters(); 571 } 572 573 /** 574 * Pass in the file descriptor of the file to be written. Call this after 575 * setOutputFormat() but before prepare(). 576 * 577 * @param fd an open file descriptor to be written into. 578 * @throws IllegalStateException if it is called before 579 * setOutputFormat() or after prepare() 580 */ 581 public void setOutputFile(FileDescriptor fd) throws IllegalStateException 582 { 583 mPath = null; 584 mFd = fd; 585 } 586 587 /** 588 * Sets the path of the output file to be produced. Call this after 589 * setOutputFormat() but before prepare(). 590 * 591 * @param path The pathname to use. 592 * @throws IllegalStateException if it is called before 593 * setOutputFormat() or after prepare() 594 */ 595 public void setOutputFile(String path) throws IllegalStateException 596 { 597 mFd = null; 598 mPath = path; 599 } 600 601 // native implementation 602 private native void _setOutputFile(FileDescriptor fd, long offset, long length) 603 throws IllegalStateException, IOException; 604 private native void _setOutputFileAux(FileDescriptor fd) 605 throws IllegalStateException, IOException; 606 private native void _prepare() throws IllegalStateException, IOException; 607 608 /** 609 * Prepares the recorder to begin capturing and encoding data. This method 610 * must be called after setting up the desired audio and video sources, 611 * encoders, file format, etc., but before start(). 612 * 613 * @throws IllegalStateException if it is called after 614 * start() or before setOutputFormat(). 615 * @throws IOException if prepare fails otherwise. 616 */ 617 public void prepare() throws IllegalStateException, IOException 618 { 619 if (mPath != null) { 620 FileOutputStream fos = new FileOutputStream(mPath); 621 try { 622 _setOutputFile(fos.getFD(), 0, 0); 623 } finally { 624 fos.close(); 625 } 626 } else if (mFd != null) { 627 _setOutputFile(mFd, 0, 0); 628 } else { 629 throw new IOException("No valid output file"); 630 } 631 632 if (mPrepareAuxiliaryFile) { 633 if (mPathAux != null) { 634 FileOutputStream fos = new FileOutputStream(mPathAux); 635 try { 636 _setOutputFileAux(fos.getFD()); 637 } finally { 638 fos.close(); 639 } 640 } else if (mFdAux != null) { 641 _setOutputFileAux(mFdAux); 642 } else { 643 throw new IOException("No valid output file"); 644 } 645 } 646 647 _prepare(); 648 } 649 650 /** 651 * Begins capturing and encoding data to the file specified with 652 * setOutputFile(). Call this after prepare(). 653 * 654 * @throws IllegalStateException if it is called before 655 * prepare(). 656 */ 657 public native void start() throws IllegalStateException; 658 659 /** 660 * Stops recording. Call this after start(). Once recording is stopped, 661 * you will have to configure it again as if it has just been constructed. 662 * 663 * @throws IllegalStateException if it is called before start() 664 */ 665 public native void stop() throws IllegalStateException; 666 667 /** 668 * Restarts the MediaRecorder to its idle state. After calling 669 * this method, you will have to configure it again as if it had just been 670 * constructed. 671 */ 672 public void reset() { 673 native_reset(); 674 675 // make sure none of the listeners get called anymore 676 mEventHandler.removeCallbacksAndMessages(null); 677 } 678 679 private native void native_reset(); 680 681 /** 682 * Returns the maximum absolute amplitude that was sampled since the last 683 * call to this method. Call this only after the setAudioSource(). 684 * 685 * @return the maximum absolute amplitude measured since the last call, or 686 * 0 when called for the first time 687 * @throws IllegalStateException if it is called before 688 * the audio source has been set. 689 */ 690 public native int getMaxAmplitude() throws IllegalStateException; 691 692 /* Do not change this value without updating its counterpart 693 * in include/media/mediarecorder.h! 694 */ 695 /** Unspecified media recorder error. 696 * @see android.media.MediaRecorder.OnErrorListener 697 */ 698 public static final int MEDIA_RECORDER_ERROR_UNKNOWN = 1; 699 700 /** 701 * Interface definition for a callback to be invoked when an error 702 * occurs while recording. 703 */ 704 public interface OnErrorListener 705 { 706 /** 707 * Called when an error occurs while recording. 708 * 709 * @param mr the MediaRecorder that encountered the error 710 * @param what the type of error that has occurred: 711 * <ul> 712 * <li>{@link #MEDIA_RECORDER_ERROR_UNKNOWN} 713 * </ul> 714 * @param extra an extra code, specific to the error type 715 */ 716 void onError(MediaRecorder mr, int what, int extra); 717 } 718 719 /** 720 * Register a callback to be invoked when an error occurs while 721 * recording. 722 * 723 * @param l the callback that will be run 724 */ 725 public void setOnErrorListener(OnErrorListener l) 726 { 727 mOnErrorListener = l; 728 } 729 730 /* Do not change these values without updating their counterparts 731 * in include/media/mediarecorder.h! 732 */ 733 /** Unspecified media recorder error. 734 * @see android.media.MediaRecorder.OnInfoListener 735 */ 736 public static final int MEDIA_RECORDER_INFO_UNKNOWN = 1; 737 /** A maximum duration had been setup and has now been reached. 738 * @see android.media.MediaRecorder.OnInfoListener 739 */ 740 public static final int MEDIA_RECORDER_INFO_MAX_DURATION_REACHED = 800; 741 /** A maximum filesize had been setup and has now been reached. 742 * @see android.media.MediaRecorder.OnInfoListener 743 */ 744 public static final int MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED = 801; 745 746 /** 747 * Interface definition for a callback to be invoked when an error 748 * occurs while recording. 749 */ 750 public interface OnInfoListener 751 { 752 /** 753 * Called when an error occurs while recording. 754 * 755 * @param mr the MediaRecorder that encountered the error 756 * @param what the type of error that has occurred: 757 * <ul> 758 * <li>{@link #MEDIA_RECORDER_INFO_UNKNOWN} 759 * <li>{@link #MEDIA_RECORDER_INFO_MAX_DURATION_REACHED} 760 * <li>{@link #MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED} 761 * </ul> 762 * @param extra an extra code, specific to the error type 763 */ 764 void onInfo(MediaRecorder mr, int what, int extra); 765 } 766 767 /** 768 * Register a callback to be invoked when an informational event occurs while 769 * recording. 770 * 771 * @param listener the callback that will be run 772 */ 773 public void setOnInfoListener(OnInfoListener listener) 774 { 775 mOnInfoListener = listener; 776 } 777 778 private class EventHandler extends Handler 779 { 780 private MediaRecorder mMediaRecorder; 781 782 public EventHandler(MediaRecorder mr, Looper looper) { 783 super(looper); 784 mMediaRecorder = mr; 785 } 786 787 /* Do not change these values without updating their counterparts 788 * in include/media/mediarecorder.h! 789 */ 790 private static final int MEDIA_RECORDER_EVENT_ERROR = 1; 791 private static final int MEDIA_RECORDER_EVENT_INFO = 2; 792 793 @Override 794 public void handleMessage(Message msg) { 795 if (mMediaRecorder.mNativeContext == 0) { 796 Log.w(TAG, "mediarecorder went away with unhandled events"); 797 return; 798 } 799 switch(msg.what) { 800 case MEDIA_RECORDER_EVENT_ERROR: 801 if (mOnErrorListener != null) 802 mOnErrorListener.onError(mMediaRecorder, msg.arg1, msg.arg2); 803 804 return; 805 806 case MEDIA_RECORDER_EVENT_INFO: 807 if (mOnInfoListener != null) 808 mOnInfoListener.onInfo(mMediaRecorder, msg.arg1, msg.arg2); 809 810 return; 811 812 default: 813 Log.e(TAG, "Unknown message type " + msg.what); 814 return; 815 } 816 } 817 } 818 819 /** 820 * Called from native code when an interesting event happens. This method 821 * just uses the EventHandler system to post the event back to the main app thread. 822 * We use a weak reference to the original MediaRecorder object so that the native 823 * code is safe from the object disappearing from underneath it. (This is 824 * the cookie passed to native_setup().) 825 */ 826 private static void postEventFromNative(Object mediarecorder_ref, 827 int what, int arg1, int arg2, Object obj) 828 { 829 MediaRecorder mr = (MediaRecorder)((WeakReference)mediarecorder_ref).get(); 830 if (mr == null) { 831 return; 832 } 833 834 if (mr.mEventHandler != null) { 835 Message m = mr.mEventHandler.obtainMessage(what, arg1, arg2, obj); 836 mr.mEventHandler.sendMessage(m); 837 } 838 } 839 840 /** 841 * Releases resources associated with this MediaRecorder object. 842 * It is good practice to call this method when you're done 843 * using the MediaRecorder. 844 */ 845 public native void release(); 846 847 private static native final void native_init(); 848 849 private native final void native_setup(Object mediarecorder_this) throws IllegalStateException; 850 851 private native final void native_finalize(); 852 853 private native void setParameter(String nameValuePair); 854 855 @Override 856 protected void finalize() { native_finalize(); } 857} 858