Android-系统服务-MediaRecorder
2024-04-16 16:16:50
0 快速索引表
- 权限汇总
https://developer.android.google.cn/reference/android/Manifest.permission
/frameworks/base/core/res/AndroidManifest.xml
1
- 接口 汇总
https://developer.android.google.cn/reference/android/media/MediaRecorder
/frameworks/base/media/java/android/media/MediaRecorder.java
android.media.MediaRecorder.prepare
android.media.MediaRecorder.start
android.media.MediaRecorder.stop
https://developer.android.google.cn/reference/android/media/AudioRecord
/frameworks/base/media/java/android/media/AudioRecord.java
android.media.AudioRecord.getState
android.media.AudioRecord.startRecording
android.media.AudioRecord.stop
android.media.AudioRecord.read
https://developer.android.google.cn/reference/android/media/ImageReader
/frameworks/base/media/java/android/media/ImageReader.java
android.media.ImageReader.acquireLatestImage
https://developer.android.google.cn/reference/android/media/projection/MediaProjection
/frameworks/base/media/java/android/media/projection/MediaProjection.java
android.media.projection.MediaProjection.createVirtualDisplay
android.media.projection.MediaProjection.registerCallback
- adb shell media命令汇总
adb shell media
- developer
5
1 需求
2 权限
3 接口
android.media.MediaRecorder.prepare
- Added in API level 1
1289 /**
1290 * Prepares the recorder to begin capturing and encoding data. This method
1291 * must be called after setting up the desired audio and video sources,
1292 * encoders, file format, etc., but before start().
1293 *
1294 * @throws IllegalStateException if it is called after
1295 * start() or before setOutputFormat().
1296 * @throws IOException if prepare fails otherwise.
1297 */
1298 public void prepare() throws IllegalStateException, IOException
1299 {
1300 if (mPath != null) {
1301 RandomAccessFile file = new RandomAccessFile(mPath, "rw");
1302 try {
1303 _setOutputFile(file.getFD());
1304 } finally {
1305 file.close();
1306 }
1307 } else if (mFd != null) {
1308 _setOutputFile(mFd);
1309 } else if (mFile != null) {
1310 RandomAccessFile file = new RandomAccessFile(mFile, "rw");
1311 try {
1312 _setOutputFile(file.getFD());
1313 } finally {
1314 file.close();
1315 }
1316 } else {
1317 throw new IOException("No valid output file");
1318 }
1319
1320 _prepare();
1321 }android.media.MediaRecorder.start
- Added in API level 1
1323 /**
1324 * Begins capturing and encoding data to the file specified with
1325 * setOutputFile(). Call this after prepare().
1326 *
1327 * <p>Since API level 13, if applications set a camera via
1328 * {@link #setCamera(Camera)}, the apps can use the camera after this method
1329 * call. The apps do not need to lock the camera again. However, if this
1330 * method fails, the apps should still lock the camera back. The apps should
1331 * not start another recording session during recording.
1332 *
1333 * @throws IllegalStateException if it is called before
1334 * prepare() or when the camera is already in use by another app.
1335 */
1336 public native void start() throws IllegalStateException;android.media.MediaRecorder.stop
- Added in API level 1
1338 /**
1339 * Stops recording. Call this after start(). Once recording is stopped,
1340 * you will have to configure it again as if it has just been constructed.
1341 * Note that a RuntimeException is intentionally thrown to the
1342 * application, if no valid audio/video data has been received when stop()
1343 * is called. This happens if stop() is called immediately after
1344 * start(). The failure lets the application take action accordingly to
1345 * clean up the output file (delete the output file, for instance), since
1346 * the output file is not properly constructed when this happens.
1347 *
1348 * @throws IllegalStateException if it is called before start()
1349 */
1350 public native void stop() throws IllegalStateException;android.media.AudioRecord.getState
- Added in API level 3
1186 /**
1187 * Returns the state of the AudioRecord instance. This is useful after the
1188 * AudioRecord instance has been created to check if it was initialized
1189 * properly. This ensures that the appropriate hardware resources have been
1190 * acquired.
1191 * @see AudioRecord#STATE_INITIALIZED
1192 * @see AudioRecord#STATE_UNINITIALIZED
1193 */
1194 public int getState() {
1195 return mState;
1196 }android.media.AudioRecord.startRecording
- Added in API level 3/16
1339 //---------------------------------------------------------
1340 // Transport control methods
1341 //--------------------
1342 /**
1343 * Starts recording from the AudioRecord instance.
1344 * @throws IllegalStateException
1345 */
1346 public void startRecording()
1347 throws IllegalStateException {
1348 if (mState != STATE_INITIALIZED) {
1349 throw new IllegalStateException("startRecording() called on an "
1350 + "uninitialized AudioRecord.");
1351 }
1352
1353 // start recording
1354 synchronized(mRecordingStateLock) {
1355 if (native_start(MediaSyncEvent.SYNC_EVENT_NONE, 0) == SUCCESS) {
1356 handleFullVolumeRec(true);
1357 mRecordingState = RECORDSTATE_RECORDING;
1358 }
1359 }
1360 }1362 /**
1363 * Starts recording from the AudioRecord instance when the specified synchronization event
1364 * occurs on the specified audio session.
1365 * @throws IllegalStateException
1366 * @param syncEvent event that triggers the capture.
1367 * @see MediaSyncEvent
1368 */
1369 public void startRecording(MediaSyncEvent syncEvent)
1370 throws IllegalStateException {
1371 if (mState != STATE_INITIALIZED) {
1372 throw new IllegalStateException("startRecording() called on an "
1373 + "uninitialized AudioRecord.");
1374 }
1375
1376 // start recording
1377 synchronized(mRecordingStateLock) {
1378 if (native_start(syncEvent.getType(), syncEvent.getAudioSessionId()) == SUCCESS) {
1379 handleFullVolumeRec(true);
1380 mRecordingState = RECORDSTATE_RECORDING;
1381 }
1382 }
1383 }android.media.AudioRecord.stop
- Added in API level 3
1385 /**
1386 * Stops recording.
1387 * @throws IllegalStateException
1388 */
1389 public void stop()
1390 throws IllegalStateException {
1391 if (mState != STATE_INITIALIZED) {
1392 throw new IllegalStateException("stop() called on an uninitialized AudioRecord.");
1393 }
1394
1395 // stop recording
1396 synchronized(mRecordingStateLock) {
1397 handleFullVolumeRec(false);
1398 native_stop();
1399 mRecordingState = RECORDSTATE_STOPPED;
1400 }
1401 }android.media.AudioRecord.read
- Added in API level 3/23
1417 //---------------------------------------------------------
1418 // Audio data supply
1419 //--------------------
1420 /**
1421 * Reads audio data from the audio hardware for recording into a byte array.
1422 * The format specified in the AudioRecord constructor should be
1423 * {@link AudioFormat#ENCODING_PCM_8BIT} to correspond to the data in the array.
1424 * @param audioData the array to which the recorded audio data is written.
1425 * @param offsetInBytes index in audioData from which the data is written expressed in bytes.
1426 * @param sizeInBytes the number of requested bytes.
1427 * @return zero or the positive number of bytes that were read, or one of the following
1428 * error codes. The number of bytes will not exceed sizeInBytes.
1429 * <ul>
1430 * <li>{@link #ERROR_INVALID_OPERATION} if the object isn't properly initialized</li>
1431 * <li>{@link #ERROR_BAD_VALUE} if the parameters don't resolve to valid data and indexes</li>
1432 * <li>{@link #ERROR_DEAD_OBJECT} if the object is not valid anymore and
1433 * needs to be recreated. The dead object error code is not returned if some data was
1434 * successfully transferred. In this case, the error is returned at the next read()</li>
1435 * <li>{@link #ERROR} in case of other error</li>
1436 * </ul>
1437 */
1438 public int read(@NonNull byte[] audioData, int offsetInBytes, int sizeInBytes) {
1439 return read(audioData, offsetInBytes, sizeInBytes, READ_BLOCKING);
1440 }android.media.ImageReader.acquireLatestImage
474 /**
475 * <p>
476 * Acquire the latest {@link Image} from the ImageReader's queue, dropping older
477 * {@link Image images}. Returns {@code null} if no new image is available.
478 * </p>
479 * <p>
480 * This operation will acquire all the images possible from the ImageReader,
481 * but {@link #close} all images that aren't the latest. This function is
482 * recommended to use over {@link #acquireNextImage} for most use-cases, as it's
483 * more suited for real-time processing.
484 * </p>
485 * <p>
486 * Note that {@link #getMaxImages maxImages} should be at least 2 for
487 * {@link #acquireLatestImage} to be any different than {@link #acquireNextImage} -
488 * discarding all-but-the-newest {@link Image} requires temporarily acquiring two
489 * {@link Image Images} at once. Or more generally, calling {@link #acquireLatestImage}
490 * with less than two images of margin, that is
491 * {@code (maxImages - currentAcquiredImages < 2)} will not discard as expected.
492 * </p>
493 * <p>
494 * This operation will fail by throwing an {@link IllegalStateException} if
495 * {@code maxImages} have been acquired with {@link #acquireLatestImage} or
496 * {@link #acquireNextImage}. In particular a sequence of {@link #acquireLatestImage}
497 * calls greater than {@link #getMaxImages} without calling {@link Image#close} in-between
498 * will exhaust the underlying queue. At such a time, {@link IllegalStateException}
499 * will be thrown until more images are
500 * released with {@link Image#close}.
501 * </p>
502 *
503 * @return latest frame of image data, or {@code null} if no image data is available.
504 * @throws IllegalStateException if too many images are currently acquired
505 */
506 public Image acquireLatestImage() {
507 Image image = acquireNextImage();
508 if (image == null) {
509 return null;
510 }
511 try {
512 for (;;) {
513 Image next = acquireNextImageNoThrowISE();
514 if (next == null) {
515 Image result = image;
516 image = null;
517 return result;
518 }
519 image.close();
520 image = next;
521 }
522 } finally {
523 if (image != null) {
524 image.close();
525 }
526 if (mParent != null) {
527 mParent.flushOther(this);
528 }
529 }
530 }android.media.projection.MediaProjection.createVirtualDisplay
101 /**
102 * @hide
103 */
104 public VirtualDisplay createVirtualDisplay(@NonNull String name,
105 int width, int height, int dpi, boolean isSecure, @Nullable Surface surface,
106 @Nullable VirtualDisplay.Callback callback, @Nullable Handler handler) {
107 int flags = DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR
108 | DisplayManager.VIRTUAL_DISPLAY_FLAG_PRESENTATION;
109 if (isSecure) {
110 flags |= DisplayManager.VIRTUAL_DISPLAY_FLAG_SECURE;
111 }
112 final VirtualDisplayConfig.Builder builder = new VirtualDisplayConfig.Builder(name, width,
113 height, dpi).setFlags(flags);
114 if (surface != null) {
115 builder.setSurface(surface);
116 }
117 VirtualDisplay virtualDisplay = createVirtualDisplay(builder, callback, handler);
118 return virtualDisplay;
119 }android.media.projection.MediaProjection.registerCallback
69 /** Register a listener to receive notifications about when the {@link
70 * MediaProjection} changes state.
71 *
72 * @param callback The callback to call.
73 * @param handler The handler on which the callback should be invoked, or
74 * null if the callback should be invoked on the calling thread's looper.
75 *
76 * @see #unregisterCallback
77 */
78 public void registerCallback(Callback callback, Handler handler) {
79 if (callback == null) {
80 throw new IllegalArgumentException("callback should not be null");
81 }
82 if (handler == null) {
83 handler = new Handler();
84 }
85 mCallbacks.put(callback, new CallbackRecord(callback, handler));
86 }4 示例
5 adb命令
adb shell media
6 参考资料
音频和视频 | Android 开发者 | Android Developers
MediaRecorder 概览 | Android 开发者 | Android Developers
MediaPlayer 概览 | Android 开发者 | Android Developers
Android 录音实现（MediaRecorder） - 简书
Android 录音实现（AudioRecord） - 简书
Android 实现录音功能_AfinalStone的专栏-CSDN博客_android 录音
本地录音 权限（android.permission.RECORD_AUDIO）
Manifest.permission | Android Developers
AndroidManifest.xml - OpenGrok cross reference for /frameworks/base/core/res/AndroidManifest.xml
本地录音 接口（MediaRecorder方案）
- android.media.MediaRecorder.start()
- android.media.MediaRecorder.stop()
http://androidxref.com/6.0.1_r10/xref/frameworks/base/media/java/android/media/MediaRecorder.java
本地录音 接口（AudioRecord方案）
- android.media.AudioRecord.startRecording()
- android.media.AudioRecord.stop()
http://androidxref.com/6.0.1_r10/xref/frameworks/base/media/java/android/media/AudioRecord.java
示例代码（MediaRecorder）
package com.learn_android.media_recorder;import androidx.appcompat.app.AppCompatActivity;import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;import java.io.IOException;public class MainActivity extends AppCompatActivity implements View.OnClickListener {private static final String TAG = "MainActivity";private static String fileName = null;private MediaRecorder mediaRecorder = null;private Button start_record = null;private Button stop_record = null;private MediaPlayer mediaPlayer = null;private Button start_play = null;private Button stop_play = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);fileName = getFilesDir().getPath();fileName += "/audiorecordtest.3gp";start_record = (Button) findViewById(R.id.start_record);stop_record = (Button) findViewById(R.id.stop_record);start_play = (Button) findViewById(R.id.start_play);stop_play = (Button) findViewById(R.id.stop_play);start_record.setOnClickListener(this);stop_record.setOnClickListener(this);start_play.setOnClickListener(this);stop_play.setOnClickListener(this);}@Overridepublic void onClick(View view) {switch (view.getId()) {case R.id.start_record:Log.i(TAG, "onClick: start record");startRecord();break;case R.id.stop_record:Log.i(TAG, "onClick: stop record");stopRecord();break;case R.id.start_play:Log.i(TAG, "onClick: start play");startPlay();break;case R.id.stop_play:Log.i(TAG, "onClick: stop play");stopPlay();break;default:break;}}public void startRecord() {mediaRecorder = new MediaRecorder();try {mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);mediaRecorder.setOutputFile(fileName);mediaRecorder.prepare();mediaRecorder.start();} catch (IOException e) {e.printStackTrace();}}public void stopRecord() {mediaRecorder.stop();mediaRecorder.release();}public void startPlay() {mediaPlayer = new MediaPlayer();try {mediaPlayer.setDataSource(fileName);mediaPlayer.prepare();mediaPlayer.start();} catch (IOException e) {e.printStackTrace();}}public void stopPlay() {mediaPlayer.release();mediaPlayer = null;}
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