我正在使用新的相机API(camera2)在android 5.0.2上创建一个应用程序.该应用程序每2.5秒拍摄一张照片,持续3个小时(总共4320张照片).正如您在下面的代码中看到的那样,我使用“ timer”对重复的内容进行编码,而没有针对Capture picture without preview using camera2 API的预览.我正在使用NEXUS7 2013 16G 5.0.2进行测试.它对于开头的200-300张图片正常工作,并失败,并显示以下错误消息.失败总是以“ E / RequestThread-1：jpeg回调的命中超时！”开始,它必须触发某些事件.有人会帮助摆脱这种触发吗？否则,如果是AndroID BUG,这将在5.1.0中修复？
03-30 15:46:04.472 11432-11432/com.example.androID.camera2basic V/yo click﹕ ---- 174 ---- click03-30 15:46:05.026 11432-11537/com.example.androID.camera2basic E/RequestThread-1﹕ Hit timeout for jpeg callback!03-30 15:46:05.027 11432-11537/com.example.androID.camera2basic W/CaptureCollector﹕ Jpeg buffers dropped for request: 17303-30 15:46:05.076 11432-11480/com.example.androID.camera2basic E/CameraDevice-JV-1﹕ Lost output buffer reported for frame 17303-30 15:46:05.090 11432-11537/com.example.androID.camera2basic W/LegacyRequestMapper﹕ convertRequestMetadata - control.awbRegions setting is not supported, ignoring value03-30 15:46:05.090 11432-11537/com.example.androID.camera2basic W/LegacyRequestMapper﹕ Only received metering rectangles with weight 0.03-30 15:46:05.091 11432-11537/com.example.androID.camera2basic W/LegacyMetadataMapper﹕ convertAfModetoLegacy - ignoring unsupported mode 4, defaulting to fixed03-30 15:46:05.091 11432-11537/com.example.androID.camera2basic W/LegacyRequestMapper﹕ convertRequestToMetadata - Ignoring androID.lens.focusdistance false, only 0.0f is supported03-30 15:46:05.098 11432-11537/com.example.androID.camera2basic E/AndroIDRuntime﹕ FATAL EXCEPTION: RequestThread-1Process: com.example.androID.camera2basic, PID: 11432java.lang.RuntimeException: startPrevIEw Failed at androID.harDWare.Camera.startPrevIEw(Native Method) at androID.harDWare.camera2.legacy.RequestThreadManager.startPrevIEw(RequestThreadManager.java:275) at androID.harDWare.camera2.legacy.RequestThreadManager.doJpegCapturePrepare(RequestThreadManager.java:288) at androID.harDWare.camera2.legacy.RequestThreadManager.access00(RequestThreadManager.java:61) at androID.harDWare.camera2.legacy.RequestThreadManager.handleMessage(RequestThreadManager.java:767) at androID.os.Handler.dispatchMessage(Handler.java:98) at androID.os.Looper.loop(Looper.java:135) at androID.os.HandlerThread.run(HandlerThread.java:61)这是我的代码：
public class CameraActivity extends Activity { Timer mTimer = null; Handler mHandler = new Handler(); private ImageReader imageReader; private Handler backgroundHandler; private HandlerThread backgroundThread; private String cameraID; private CameraDevice cameraDevice; private CameraCaptureSession cameraCaptureSession; static int count = 0; static int count2 = 0; /** * Conversion from screen rotation to JPEG orIEntation. */ private static final SparseIntArray ORIENTATIONS = new SparseIntArray(); static { ORIENTATIONS.append(Surface.ROTATION_0, 90); ORIENTATIONS.append(Surface.ROTATION_90, 0); ORIENTATIONS.append(Surface.ROTATION_180, 270); ORIENTATIONS.append(Surface.ROTATION_270, 180); }@OverrIDeprotected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //setContentVIEw(R.layout.activity_camera); setContentVIEw(R.layout.activity_main); button takePicture = (button)findVIEwByID(R.ID.takepic); takePicture.setonClickListener(onClickPicture); //(1) setting up camera but stop before camera createCaptureRequest setupCamera2();}private voID setupCamera2() { CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); try { for (String cameraID : manager.getCameraIDList()) { Cameracharacteristics characteristics = manager.getCameracharacteristics(cameraID); //if (characteristics.get(Cameracharacteristics.LENS_FACING) != Cameracharacteristics.LENS_FACING_BACK) { if (characteristics.get(Cameracharacteristics.LENS_FACING) != Cameracharacteristics.LENS_FACING_FRONT) { continue; } StreamConfigurationMap configs = characteristics.get( Cameracharacteristics.SCALER_STREAM_CONfigURATION_MAP); this.cameraID = cameraID; manager.openCamera(this.cameraID, cameraStateCallback, backgroundHandler); Size[] sizes = configs.getoutputSizes(ImageFormat.JPEG); int picWIDth = 640;//1920; int picHeight = 480;//1080; imageReader = ImageReader.newInstance(picWIDth, picHeight, ImageFormat.JPEG, 2); imageReader.setonImageAvailableListener(onImageAvailableListener, backgroundHandler); } } catch (CameraAccessException | NullPointerException e) { e.printstacktrace(); }}private final CameraDevice.StateCallback cameraStateCallback = new CameraDevice.StateCallback() { @OverrIDe public voID onopened(CameraDevice device) { cameraDevice = device; //(2) Camera capture session createCameraCaptureSession(); } @OverrIDe public voID ondisconnected(CameraDevice cameraDevice) {} @OverrIDe public voID one rror(CameraDevice cameraDevice, int error) {}}; //private voID createCaptureSession() {private voID createCameraCaptureSession() { List<Surface> outputSurfaces = new linkedList<>(); outputSurfaces.add(imageReader.getSurface()); Log.v("-yo(2)-", "in createcameraCaptureSession Now"); try { cameraDevice.createCaptureSession(outputSurfaces, new CameraCaptureSession.StateCallback() { @OverrIDe public voID onConfigured(CameraCaptureSession session) { //cameraCaptureSession = session; cameraCaptureSession = session; //commented out to invoked from button //createCaptureRequest(); } @OverrIDe public voID onConfigureFailed(CameraCaptureSession session) {} }, null); } catch (CameraAccessException e) { e.printstacktrace(); }}private final ImageReader.OnImageAvailableListener onImageAvailableListener = new ImageReader.OnImageAvailableListener() { @OverrIDe public voID onImageAvailable(ImageReader reader) { //createCaptureRequest(); Log.v("yo ireader ","---- "+(count2++)+" ---- ireader"); //Image mImage = imageReader.acquireLatestimage(); Image mImage = reader.acquireLatestimage(); file mfile = new file(Environment.getExternalStorageDirectory() + "/yP2PTEST/0P2Pimage.jpg"); Log.v("--yo--", "In ImageReader Now writing to "+mfile); ///////////////////////////////////// ByteBuffer buffer = mImage.getPlanes()[0].getBuffer(); byte[] bytes = new byte[buffer.remaining()]; buffer.get(bytes); fileOutputStream output = null; try { output = new fileOutputStream(mfile); output.write(bytes); } catch (fileNotFoundException e) { e.printstacktrace(); } catch (IOException e) { e.printstacktrace(); } finally { mImage.close(); if (null != output) { try { output.close(); } catch (IOException e) { e.printstacktrace(); } } } ImageVIEw curPic = (ImageVIEw)findVIEwByID(R.ID.imageVIEw1); Bitmap mCurrentBitmap = BitmapFactory.decodefile(mfile.getPath()); curPic.setimageBitmap(mCurrentBitmap); } /////////////////////////////////// };private voID createCaptureRequest() { Log.v("-yo(3)-", "in createCaptureRequest Now"); try { CaptureRequest.Builder requestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE); requestBuilder.addTarget(imageReader.getSurface()); // Focus requestBuilder.set(CaptureRequest.CONTRol_AF_MODE, CaptureRequest.CONTRol_AF_MODE_CONTINUOUS_PICTURE); // OrIEntation //yo int rotation = windowManager.getDefaultdisplay().getRotation(); int rotation = this.getwindowManager().getDefaultdisplay().getRotation(); requestBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation)); // cameraCaptureSession.capture(requestBuilder.build(), camera2Callback, null); cameraCaptureSession.capture(requestBuilder.build(), mCaptureCallback, null); } catch (CameraAccessException e) { e.printstacktrace(); }} CameraCaptureSession.CaptureCallback mCaptureCallback = new CameraCaptureSession.CaptureCallback() { @OverrIDe public voID onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) { //showToast("JPEG Saved : "); //Log.v("yo save","- saved JPEG -"); //unlockFocus(); } }; private Handler mMessageHandler = new Handler() { @OverrIDe public voID handleMessage(Message msg) { if (this != null) { Toast.makeText(CameraActivity.this, (String) msg.obj, Toast.LENGTH_SHORT).show(); } } }; private voID showToast(String text) { // We show a Toast by sending request message to mMessageHandler. This makes sure that the // Toast is shown on the UI thread. Message message = Message.obtain(); message.obj = text; mMessageHandler.sendMessage(message); }//------------------------------------------------------------// public VIEw.OnClickListener onClickPicture = new VIEw.OnClickListener() { public voID onClick(VIEw v) { /*------- camera2 --------------*/ mTimer = null; mTimer = new Timer(true); mTimer.schedule( new TimerTask(){ @OverrIDe public voID run() { /*------------------------*/ mHandler.post( new Runnable() { public voID run() { createCaptureRequest(); Log.v("yo click ","---- "+(count++)+" ---- click"); } }); } }, 1000, 2500);//1500,1600, 1800 etc }; };};提前致谢.
编辑
我调查了CAMERA2 API的源程序,并发现了错误消息的出处.
JPEG_FRAME_TIMEOUT当前为300ms,我猜它太小了,想要增加它.如果有人知道该怎么做,请告诉我？
if (holder.hasJpegTargets()) { doJpegCapture(holder); if (!mReceivedJpeg.block(JPEG_FRAME_TIMEOUT)) { Log.e(TAG, "Hit timeout for jpeg callback!"); mCaptureCollector.failNextJpeg(); } }解决方法:
修改过的Google示例遇到了相同的问题.
拍完两张照片后,出现了此错误,因此您只需要根据需要扩展最后一个参数,它就可以工作.
imageReader = ImageReader.newInstance(largest.getWIDth(), largest.getHeight(),ImageFormat.JPEG, 2);但是请记住以下几点：
@param maxImages用户想要同时访问的最大图像数.该值应尽可能小以限制内存使用.用户获得maxImages图像后,必须释放其中一个图像,然后才能通过{@link #acquireLatestimage()}或{@link #acquireNextimage()}访问新图像.必须大于0.
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