AudioRecord.java revision 2ba92c71b5684dce700cf848bf157153c156df1d
1/* 2 * Copyright (C) 2008 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 java.lang.ref.WeakReference; 20import java.io.OutputStream; 21import java.io.IOException; 22import java.lang.IllegalArgumentException; 23import java.lang.IllegalStateException; 24import java.lang.Thread; 25import java.nio.ByteBuffer; 26 27import android.os.Handler; 28import android.os.Looper; 29import android.os.Message; 30import android.util.Log; 31 32/** 33 * The AudioRecord class manages the audio resources for Java applications 34 * to record audio from the audio input hardware of the platform. This is 35 * achieved by "pulling" (reading) the data from the AudioRecord object. The 36 * application is responsible for polling the AudioRecord object in time using one of 37 * the following three methods: {@link #read(byte[],int, int)}, {@link #read(short[], int, int)} 38 * or {@link #read(ByteBuffer, int)}. The choice of which method to use will be based 39 * on the audio data storage format that is the most convenient for the user of AudioRecord. 40 * <p>Upon creation, an AudioRecord object initializes its associated audio buffer that it will 41 * fill with the new audio data. The size of this buffer, specified during the construction, 42 * determines how long an AudioRecord can record before "over-running" data that has not 43 * been read yet. Data should be read from the audio hardware in chunks of sizes inferior to 44 * the total recording buffer size. 45 */ 46public class AudioRecord 47{ 48 //--------------------------------------------------------- 49 // Constants 50 //-------------------- 51 /** 52 * indicates AudioRecord state is not successfully initialized. 53 */ 54 public static final int STATE_UNINITIALIZED = 0; 55 /** 56 * indicates AudioRecord state is ready to be used 57 */ 58 public static final int STATE_INITIALIZED = 1; 59 60 /** 61 * indicates AudioRecord recording state is not recording 62 */ 63 public static final int RECORDSTATE_STOPPED = 1; // matches SL_RECORDSTATE_STOPPED 64 /** 65 * indicates AudioRecord recording state is recording 66 */ 67 public static final int RECORDSTATE_RECORDING = 3;// matches SL_RECORDSTATE_RECORDING 68 69 // Error codes: 70 // to keep in sync with frameworks/base/core/jni/android_media_AudioRecord.cpp 71 /** 72 * Denotes a successful operation. 73 */ 74 public static final int SUCCESS = 0; 75 /** 76 * Denotes a generic operation failure. 77 */ 78 public static final int ERROR = -1; 79 /** 80 * Denotes a failure due to the use of an invalid value. 81 */ 82 public static final int ERROR_BAD_VALUE = -2; 83 /** 84 * Denotes a failure due to the improper use of a method. 85 */ 86 public static final int ERROR_INVALID_OPERATION = -3; 87 88 private static final int AUDIORECORD_ERROR_SETUP_ZEROFRAMECOUNT = -16; 89 private static final int AUDIORECORD_ERROR_SETUP_INVALIDCHANNELMASK = -17; 90 private static final int AUDIORECORD_ERROR_SETUP_INVALIDFORMAT = -18; 91 private static final int AUDIORECORD_ERROR_SETUP_INVALIDSOURCE = -19; 92 private static final int AUDIORECORD_ERROR_SETUP_NATIVEINITFAILED = -20; 93 94 // Events: 95 // to keep in sync with frameworks/base/include/media/AudioRecord.h 96 /** 97 * Event id denotes when record head has reached a previously set marker. 98 */ 99 private static final int NATIVE_EVENT_MARKER = 2; 100 /** 101 * Event id denotes when previously set update period has elapsed during recording. 102 */ 103 private static final int NATIVE_EVENT_NEW_POS = 3; 104 105 private final static String TAG = "AudioRecord-Java"; 106 107 108 //--------------------------------------------------------- 109 // Used exclusively by native code 110 //-------------------- 111 /** 112 * Accessed by native methods: provides access to C++ AudioRecord object 113 */ 114 @SuppressWarnings("unused") 115 private int mNativeRecorderInJavaObj; 116 117 /** 118 * Accessed by native methods: provides access to the callback data. 119 */ 120 @SuppressWarnings("unused") 121 private int mNativeCallbackCookie; 122 123 124 //--------------------------------------------------------- 125 // Member variables 126 //-------------------- 127 /** 128 * The audio data sampling rate in Hz. 129 */ 130 private int mSampleRate = 22050; 131 /** 132 * The number of input audio channels (1 is mono, 2 is stereo) 133 */ 134 private int mChannelCount = 1; 135 /** 136 * The audio channel mask 137 */ 138 private int mChannels = AudioFormat.CHANNEL_IN_MONO; 139 /** 140 * The current audio channel configuration 141 */ 142 private int mChannelConfiguration = AudioFormat.CHANNEL_IN_MONO; 143 /** 144 * The encoding of the audio samples. 145 * @see AudioFormat#ENCODING_PCM_8BIT 146 * @see AudioFormat#ENCODING_PCM_16BIT 147 */ 148 private int mAudioFormat = AudioFormat.ENCODING_PCM_16BIT; 149 /** 150 * Where the audio data is recorded from. 151 */ 152 private int mRecordSource = MediaRecorder.AudioSource.DEFAULT; 153 /** 154 * Indicates the state of the AudioRecord instance. 155 */ 156 private int mState = STATE_UNINITIALIZED; 157 /** 158 * Indicates the recording state of the AudioRecord instance. 159 */ 160 private int mRecordingState = RECORDSTATE_STOPPED; 161 /** 162 * Lock to make sure mRecordingState updates are reflecting the actual state of the object. 163 */ 164 private Object mRecordingStateLock = new Object(); 165 /** 166 * The listener the AudioRecord notifies when the record position reaches a marker 167 * or for periodic updates during the progression of the record head. 168 * @see #setRecordPositionUpdateListener(OnRecordPositionUpdateListener) 169 * @see #setRecordPositionUpdateListener(OnRecordPositionUpdateListener, Handler) 170 */ 171 private OnRecordPositionUpdateListener mPositionListener = null; 172 /** 173 * Lock to protect position listener updates against event notifications 174 */ 175 private final Object mPositionListenerLock = new Object(); 176 /** 177 * Handler for marker events coming from the native code 178 */ 179 private NativeEventHandler mEventHandler = null; 180 /** 181 * Looper associated with the thread that creates the AudioRecord instance 182 */ 183 private Looper mInitializationLooper = null; 184 /** 185 * Size of the native audio buffer. 186 */ 187 private int mNativeBufferSizeInBytes = 0; 188 189 190 //--------------------------------------------------------- 191 // Constructor, Finalize 192 //-------------------- 193 /** 194 * Class constructor. 195 * @param audioSource the recording source. See {@link MediaRecorder.AudioSource} for 196 * recording source definitions. 197 * @param sampleRateInHz the sample rate expressed in Hertz. Examples of rates are (but 198 * not limited to) 44100, 22050 and 11025. 199 * @param channelConfig describes the configuration of the audio channels. 200 * See {@link AudioFormat#CHANNEL_IN_MONO} and 201 * {@link AudioFormat#CHANNEL_IN_STEREO} 202 * @param audioFormat the format in which the audio data is represented. 203 * See {@link AudioFormat#ENCODING_PCM_16BIT} and 204 * {@link AudioFormat#ENCODING_PCM_8BIT} 205 * @param bufferSizeInBytes the total size (in bytes) of the buffer where audio data is written 206 * to during the recording. New audio data can be read from this buffer in smaller chunks 207 * than this size. See {@link #getMinBufferSize(int, int, int)} to determine the minimum 208 * required buffer size for the successful creation of an AudioRecord instance. Using values 209 * smaller than getMinBufferSize() will result in an initialization failure. 210 * @throws java.lang.IllegalArgumentException 211 */ 212 public AudioRecord(int audioSource, int sampleRateInHz, int channelConfig, int audioFormat, 213 int bufferSizeInBytes) 214 throws IllegalArgumentException { 215 mState = STATE_UNINITIALIZED; 216 mRecordingState = RECORDSTATE_STOPPED; 217 218 // remember which looper is associated with the AudioRecord instanciation 219 if ((mInitializationLooper = Looper.myLooper()) == null) { 220 mInitializationLooper = Looper.getMainLooper(); 221 } 222 223 audioParamCheck(audioSource, sampleRateInHz, channelConfig, audioFormat); 224 225 audioBuffSizeCheck(bufferSizeInBytes); 226 227 // native initialization 228 //TODO: update native initialization when information about hardware init failure 229 // due to capture device already open is available. 230 int initResult = native_setup( new WeakReference<AudioRecord>(this), 231 mRecordSource, mSampleRate, mChannels, mAudioFormat, mNativeBufferSizeInBytes); 232 if (initResult != SUCCESS) { 233 loge("Error code "+initResult+" when initializing native AudioRecord object."); 234 return; // with mState == STATE_UNINITIALIZED 235 } 236 237 mState = STATE_INITIALIZED; 238 } 239 240 241 // Convenience method for the constructor's parameter checks. 242 // This is where constructor IllegalArgumentException-s are thrown 243 // postconditions: 244 // mRecordSource is valid 245 // mChannelCount is valid 246 // mChannels is valid 247 // mAudioFormat is valid 248 // mSampleRate is valid 249 private void audioParamCheck(int audioSource, int sampleRateInHz, 250 int channelConfig, int audioFormat) { 251 252 //-------------- 253 // audio source 254 if ( (audioSource < MediaRecorder.AudioSource.DEFAULT) || 255 (audioSource > MediaRecorder.AudioSource.VOICE_COMMUNICATION) ) { 256 //(audioSource > MediaRecorder.getAudioSourceMax()) ) { 257 throw (new IllegalArgumentException("Invalid audio source.")); 258 } else { 259 mRecordSource = audioSource; 260 } 261 262 //-------------- 263 // sample rate 264 if ( (sampleRateInHz < 4000) || (sampleRateInHz > 48000) ) { 265 throw (new IllegalArgumentException(sampleRateInHz 266 + "Hz is not a supported sample rate.")); 267 } else { 268 mSampleRate = sampleRateInHz; 269 } 270 271 //-------------- 272 // channel config 273 mChannelConfiguration = channelConfig; 274 275 switch (channelConfig) { 276 case AudioFormat.CHANNEL_IN_DEFAULT: // AudioFormat.CHANNEL_CONFIGURATION_DEFAULT 277 case AudioFormat.CHANNEL_IN_MONO: 278 case AudioFormat.CHANNEL_CONFIGURATION_MONO: 279 mChannelCount = 1; 280 mChannels = AudioFormat.CHANNEL_IN_MONO; 281 break; 282 case AudioFormat.CHANNEL_IN_STEREO: 283 case AudioFormat.CHANNEL_CONFIGURATION_STEREO: 284 mChannelCount = 2; 285 mChannels = AudioFormat.CHANNEL_IN_STEREO; 286 break; 287 default: 288 mChannelCount = 0; 289 mChannels = AudioFormat.CHANNEL_INVALID; 290 mChannelConfiguration = AudioFormat.CHANNEL_INVALID; 291 throw (new IllegalArgumentException("Unsupported channel configuration.")); 292 } 293 294 //-------------- 295 // audio format 296 switch (audioFormat) { 297 case AudioFormat.ENCODING_DEFAULT: 298 mAudioFormat = AudioFormat.ENCODING_PCM_16BIT; 299 break; 300 case AudioFormat.ENCODING_PCM_16BIT: 301 case AudioFormat.ENCODING_PCM_8BIT: 302 mAudioFormat = audioFormat; 303 break; 304 default: 305 mAudioFormat = AudioFormat.ENCODING_INVALID; 306 throw (new IllegalArgumentException("Unsupported sample encoding." 307 + " Should be ENCODING_PCM_8BIT or ENCODING_PCM_16BIT.")); 308 } 309 } 310 311 312 // Convenience method for the contructor's audio buffer size check. 313 // preconditions: 314 // mChannelCount is valid 315 // mAudioFormat is AudioFormat.ENCODING_PCM_8BIT OR AudioFormat.ENCODING_PCM_16BIT 316 // postcondition: 317 // mNativeBufferSizeInBytes is valid (multiple of frame size, positive) 318 private void audioBuffSizeCheck(int audioBufferSize) { 319 // NB: this section is only valid with PCM data. 320 // To update when supporting compressed formats 321 int frameSizeInBytes = mChannelCount 322 * (mAudioFormat == AudioFormat.ENCODING_PCM_8BIT ? 1 : 2); 323 if ((audioBufferSize % frameSizeInBytes != 0) || (audioBufferSize < 1)) { 324 throw (new IllegalArgumentException("Invalid audio buffer size.")); 325 } 326 327 mNativeBufferSizeInBytes = audioBufferSize; 328 } 329 330 331 332 /** 333 * Releases the native AudioRecord resources. 334 * The object can no longer be used and the reference should be set to null 335 * after a call to release() 336 */ 337 public void release() { 338 try { 339 stop(); 340 } catch(IllegalStateException ise) { 341 // don't raise an exception, we're releasing the resources. 342 } 343 native_release(); 344 mState = STATE_UNINITIALIZED; 345 } 346 347 348 @Override 349 protected void finalize() { 350 native_finalize(); 351 } 352 353 354 //-------------------------------------------------------------------------- 355 // Getters 356 //-------------------- 357 /** 358 * Returns the configured audio data sample rate in Hz 359 */ 360 public int getSampleRate() { 361 return mSampleRate; 362 } 363 364 /** 365 * Returns the audio recording source. 366 * @see MediaRecorder.AudioSource 367 */ 368 public int getAudioSource() { 369 return mRecordSource; 370 } 371 372 /** 373 * Returns the configured audio data format. See {@link AudioFormat#ENCODING_PCM_16BIT} 374 * and {@link AudioFormat#ENCODING_PCM_8BIT}. 375 */ 376 public int getAudioFormat() { 377 return mAudioFormat; 378 } 379 380 /** 381 * Returns the configured channel configuration. 382 * See {@link AudioFormat#CHANNEL_IN_MONO} 383 * and {@link AudioFormat#CHANNEL_IN_STEREO}. 384 */ 385 public int getChannelConfiguration() { 386 return mChannelConfiguration; 387 } 388 389 /** 390 * Returns the configured number of channels. 391 */ 392 public int getChannelCount() { 393 return mChannelCount; 394 } 395 396 /** 397 * Returns the state of the AudioRecord instance. This is useful after the 398 * AudioRecord instance has been created to check if it was initialized 399 * properly. This ensures that the appropriate hardware resources have been 400 * acquired. 401 * @see AudioRecord#STATE_INITIALIZED 402 * @see AudioRecord#STATE_UNINITIALIZED 403 */ 404 public int getState() { 405 return mState; 406 } 407 408 /** 409 * Returns the recording state of the AudioRecord instance. 410 * @see AudioRecord#RECORDSTATE_STOPPED 411 * @see AudioRecord#RECORDSTATE_RECORDING 412 */ 413 public int getRecordingState() { 414 return mRecordingState; 415 } 416 417 /** 418 * Returns the notification marker position expressed in frames. 419 */ 420 public int getNotificationMarkerPosition() { 421 return native_get_marker_pos(); 422 } 423 424 /** 425 * Returns the notification update period expressed in frames. 426 */ 427 public int getPositionNotificationPeriod() { 428 return native_get_pos_update_period(); 429 } 430 431 /** 432 * Returns the minimum buffer size required for the successful creation of an AudioRecord 433 * object. 434 * Note that this size doesn't guarantee a smooth recording under load, and higher values 435 * should be chosen according to the expected frequency at which the AudioRecord instance 436 * will be polled for new data. 437 * @param sampleRateInHz the sample rate expressed in Hertz. 438 * @param channelConfig describes the configuration of the audio channels. 439 * See {@link AudioFormat#CHANNEL_IN_MONO} and 440 * {@link AudioFormat#CHANNEL_IN_STEREO} 441 * @param audioFormat the format in which the audio data is represented. 442 * See {@link AudioFormat#ENCODING_PCM_16BIT}. 443 * @return {@link #ERROR_BAD_VALUE} if the recording parameters are not supported by the 444 * hardware, or an invalid parameter was passed, 445 * or {@link #ERROR} if the implementation was unable to query the hardware for its 446 * output properties, 447 * or the minimum buffer size expressed in bytes. 448 */ 449 static public int getMinBufferSize(int sampleRateInHz, int channelConfig, int audioFormat) { 450 int channelCount = 0; 451 switch(channelConfig) { 452 case AudioFormat.CHANNEL_IN_DEFAULT: // AudioFormat.CHANNEL_CONFIGURATION_DEFAULT 453 case AudioFormat.CHANNEL_IN_MONO: 454 case AudioFormat.CHANNEL_CONFIGURATION_MONO: 455 channelCount = 1; 456 break; 457 case AudioFormat.CHANNEL_IN_STEREO: 458 case AudioFormat.CHANNEL_CONFIGURATION_STEREO: 459 channelCount = 2; 460 break; 461 case AudioFormat.CHANNEL_INVALID: 462 default: 463 loge("getMinBufferSize(): Invalid channel configuration."); 464 return AudioRecord.ERROR_BAD_VALUE; 465 } 466 467 // PCM_8BIT is not supported at the moment 468 if (audioFormat != AudioFormat.ENCODING_PCM_16BIT) { 469 loge("getMinBufferSize(): Invalid audio format."); 470 return AudioRecord.ERROR_BAD_VALUE; 471 } 472 473 int size = native_get_min_buff_size(sampleRateInHz, channelCount, audioFormat); 474 if (size == 0) { 475 return AudioRecord.ERROR_BAD_VALUE; 476 } 477 else if (size == -1) { 478 return AudioRecord.ERROR; 479 } 480 else { 481 return size; 482 } 483 } 484 485 486 //--------------------------------------------------------- 487 // Transport control methods 488 //-------------------- 489 /** 490 * Starts recording from the AudioRecord instance. 491 * @throws IllegalStateException 492 */ 493 public void startRecording() 494 throws IllegalStateException { 495 if (mState != STATE_INITIALIZED) { 496 throw(new IllegalStateException("startRecording() called on an " 497 +"uninitialized AudioRecord.")); 498 } 499 500 // start recording 501 synchronized(mRecordingStateLock) { 502 if (native_start() == SUCCESS) { 503 mRecordingState = RECORDSTATE_RECORDING; 504 } 505 } 506 } 507 508 509 510 /** 511 * Stops recording. 512 * @throws IllegalStateException 513 */ 514 public void stop() 515 throws IllegalStateException { 516 if (mState != STATE_INITIALIZED) { 517 throw(new IllegalStateException("stop() called on an uninitialized AudioRecord.")); 518 } 519 520 // stop recording 521 synchronized(mRecordingStateLock) { 522 native_stop(); 523 mRecordingState = RECORDSTATE_STOPPED; 524 } 525 } 526 527 528 //--------------------------------------------------------- 529 // Audio data supply 530 //-------------------- 531 /** 532 * Reads audio data from the audio hardware for recording into a buffer. 533 * @param audioData the array to which the recorded audio data is written. 534 * @param offsetInBytes index in audioData from which the data is written expressed in bytes. 535 * @param sizeInBytes the number of requested bytes. 536 * @return the number of bytes that were read or or {@link #ERROR_INVALID_OPERATION} 537 * if the object wasn't properly initialized, or {@link #ERROR_BAD_VALUE} if 538 * the parameters don't resolve to valid data and indexes. 539 * The number of bytes will not exceed sizeInBytes. 540 */ 541 public int read(byte[] audioData, int offsetInBytes, int sizeInBytes) { 542 if (mState != STATE_INITIALIZED) { 543 return ERROR_INVALID_OPERATION; 544 } 545 546 if ( (audioData == null) || (offsetInBytes < 0 ) || (sizeInBytes < 0) 547 || (offsetInBytes + sizeInBytes > audioData.length)) { 548 return ERROR_BAD_VALUE; 549 } 550 551 return native_read_in_byte_array(audioData, offsetInBytes, sizeInBytes); 552 } 553 554 555 /** 556 * Reads audio data from the audio hardware for recording into a buffer. 557 * @param audioData the array to which the recorded audio data is written. 558 * @param offsetInShorts index in audioData from which the data is written expressed in shorts. 559 * @param sizeInShorts the number of requested shorts. 560 * @return the number of shorts that were read or or {@link #ERROR_INVALID_OPERATION} 561 * if the object wasn't properly initialized, or {@link #ERROR_BAD_VALUE} if 562 * the parameters don't resolve to valid data and indexes. 563 * The number of shorts will not exceed sizeInShorts. 564 */ 565 public int read(short[] audioData, int offsetInShorts, int sizeInShorts) { 566 if (mState != STATE_INITIALIZED) { 567 return ERROR_INVALID_OPERATION; 568 } 569 570 if ( (audioData == null) || (offsetInShorts < 0 ) || (sizeInShorts < 0) 571 || (offsetInShorts + sizeInShorts > audioData.length)) { 572 return ERROR_BAD_VALUE; 573 } 574 575 return native_read_in_short_array(audioData, offsetInShorts, sizeInShorts); 576 } 577 578 579 /** 580 * Reads audio data from the audio hardware for recording into a direct buffer. If this buffer 581 * is not a direct buffer, this method will always return 0. 582 * @param audioBuffer the direct buffer to which the recorded audio data is written. 583 * @param sizeInBytes the number of requested bytes. 584 * @return the number of bytes that were read or or {@link #ERROR_INVALID_OPERATION} 585 * if the object wasn't properly initialized, or {@link #ERROR_BAD_VALUE} if 586 * the parameters don't resolve to valid data and indexes. 587 * The number of bytes will not exceed sizeInBytes. 588 */ 589 public int read(ByteBuffer audioBuffer, int sizeInBytes) { 590 if (mState != STATE_INITIALIZED) { 591 return ERROR_INVALID_OPERATION; 592 } 593 594 if ( (audioBuffer == null) || (sizeInBytes < 0) ) { 595 return ERROR_BAD_VALUE; 596 } 597 598 return native_read_in_direct_buffer(audioBuffer, sizeInBytes); 599 } 600 601 602 //-------------------------------------------------------------------------- 603 // Initialization / configuration 604 //-------------------- 605 /** 606 * Sets the listener the AudioRecord notifies when a previously set marker is reached or 607 * for each periodic record head position update. 608 * @param listener 609 */ 610 public void setRecordPositionUpdateListener(OnRecordPositionUpdateListener listener) { 611 setRecordPositionUpdateListener(listener, null); 612 } 613 614 /** 615 * Sets the listener the AudioRecord notifies when a previously set marker is reached or 616 * for each periodic record head position update. 617 * Use this method to receive AudioRecord events in the Handler associated with another 618 * thread than the one in which you created the AudioTrack instance. 619 * @param listener 620 * @param handler the Handler that will receive the event notification messages. 621 */ 622 public void setRecordPositionUpdateListener(OnRecordPositionUpdateListener listener, 623 Handler handler) { 624 synchronized (mPositionListenerLock) { 625 626 mPositionListener = listener; 627 628 if (listener != null) { 629 if (handler != null) { 630 mEventHandler = new NativeEventHandler(this, handler.getLooper()); 631 } else { 632 // no given handler, use the looper the AudioRecord was created in 633 mEventHandler = new NativeEventHandler(this, mInitializationLooper); 634 } 635 } else { 636 mEventHandler = null; 637 } 638 } 639 640 } 641 642 643 /** 644 * Sets the marker position at which the listener is called, if set with 645 * {@link #setRecordPositionUpdateListener(OnRecordPositionUpdateListener)} or 646 * {@link #setRecordPositionUpdateListener(OnRecordPositionUpdateListener, Handler)}. 647 * @param markerInFrames marker position expressed in frames 648 * @return error code or success, see {@link #SUCCESS}, {@link #ERROR_BAD_VALUE}, 649 * {@link #ERROR_INVALID_OPERATION} 650 */ 651 public int setNotificationMarkerPosition(int markerInFrames) { 652 return native_set_marker_pos(markerInFrames); 653 } 654 655 656 /** 657 * Sets the period at which the listener is called, if set with 658 * {@link #setRecordPositionUpdateListener(OnRecordPositionUpdateListener)} or 659 * {@link #setRecordPositionUpdateListener(OnRecordPositionUpdateListener, Handler)}. 660 * @param periodInFrames update period expressed in frames 661 * @return error code or success, see {@link #SUCCESS}, {@link #ERROR_INVALID_OPERATION} 662 */ 663 public int setPositionNotificationPeriod(int periodInFrames) { 664 return native_set_pos_update_period(periodInFrames); 665 } 666 667 668 //--------------------------------------------------------- 669 // Interface definitions 670 //-------------------- 671 /** 672 * Interface definition for a callback to be invoked when an AudioRecord has 673 * reached a notification marker set by {@link AudioRecord#setNotificationMarkerPosition(int)} 674 * or for periodic updates on the progress of the record head, as set by 675 * {@link AudioRecord#setPositionNotificationPeriod(int)}. 676 */ 677 public interface OnRecordPositionUpdateListener { 678 /** 679 * Called on the listener to notify it that the previously set marker has been reached 680 * by the recording head. 681 */ 682 void onMarkerReached(AudioRecord recorder); 683 684 /** 685 * Called on the listener to periodically notify it that the record head has reached 686 * a multiple of the notification period. 687 */ 688 void onPeriodicNotification(AudioRecord recorder); 689 } 690 691 692 693 //--------------------------------------------------------- 694 // Inner classes 695 //-------------------- 696 697 /** 698 * Helper class to handle the forwarding of native events to the appropriate listener 699 * (potentially) handled in a different thread 700 */ 701 private class NativeEventHandler extends Handler { 702 703 private final AudioRecord mAudioRecord; 704 705 NativeEventHandler(AudioRecord recorder, Looper looper) { 706 super(looper); 707 mAudioRecord = recorder; 708 } 709 710 @Override 711 public void handleMessage(Message msg) { 712 OnRecordPositionUpdateListener listener = null; 713 synchronized (mPositionListenerLock) { 714 listener = mAudioRecord.mPositionListener; 715 } 716 717 switch(msg.what) { 718 case NATIVE_EVENT_MARKER: 719 if (listener != null) { 720 listener.onMarkerReached(mAudioRecord); 721 } 722 break; 723 case NATIVE_EVENT_NEW_POS: 724 if (listener != null) { 725 listener.onPeriodicNotification(mAudioRecord); 726 } 727 break; 728 default: 729 Log.e(TAG, "[ android.media.AudioRecord.NativeEventHandler ] " + 730 "Unknown event type: " + msg.what); 731 break; 732 } 733 } 734 }; 735 736 737 //--------------------------------------------------------- 738 // Java methods called from the native side 739 //-------------------- 740 @SuppressWarnings("unused") 741 private static void postEventFromNative(Object audiorecord_ref, 742 int what, int arg1, int arg2, Object obj) { 743 //logd("Event posted from the native side: event="+ what + " args="+ arg1+" "+arg2); 744 AudioRecord recorder = (AudioRecord)((WeakReference)audiorecord_ref).get(); 745 if (recorder == null) { 746 return; 747 } 748 749 if (recorder.mEventHandler != null) { 750 Message m = 751 recorder.mEventHandler.obtainMessage(what, arg1, arg2, obj); 752 recorder.mEventHandler.sendMessage(m); 753 } 754 755 } 756 757 758 //--------------------------------------------------------- 759 // Native methods called from the Java side 760 //-------------------- 761 762 private native final int native_setup(Object audiorecord_this, 763 int recordSource, int sampleRate, int nbChannels, int audioFormat, int buffSizeInBytes); 764 765 private native final void native_finalize(); 766 767 private native final void native_release(); 768 769 private native final int native_start(); 770 771 private native final void native_stop(); 772 773 private native final int native_read_in_byte_array(byte[] audioData, 774 int offsetInBytes, int sizeInBytes); 775 776 private native final int native_read_in_short_array(short[] audioData, 777 int offsetInShorts, int sizeInShorts); 778 779 private native final int native_read_in_direct_buffer(Object jBuffer, int sizeInBytes); 780 781 private native final int native_set_marker_pos(int marker); 782 private native final int native_get_marker_pos(); 783 784 private native final int native_set_pos_update_period(int updatePeriod); 785 private native final int native_get_pos_update_period(); 786 787 static private native final int native_get_min_buff_size( 788 int sampleRateInHz, int channelCount, int audioFormat); 789 790 791 //--------------------------------------------------------- 792 // Utility methods 793 //------------------ 794 795 private static void logd(String msg) { 796 Log.d(TAG, "[ android.media.AudioRecord ] " + msg); 797 } 798 799 private static void loge(String msg) { 800 Log.e(TAG, "[ android.media.AudioRecord ] " + msg); 801 } 802 803} 804 805