image processing - android camera2 process each frame and display its preview -

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i use https://github.com/googlesamples/android-camera2basic, try modify in way access each frame before drawn on surfaceview. understood, should add additional surface (imagereader.getsurface()), , read frame in callback:

private final imagereader.onimageavailablelistener monimageavailablelistener             = new imagereader.onimageavailablelistener() {          @override         public void onimageavailable(imagereader reader) {             log.d("img", "onimageavailable");             mbackgroundhandler.post(new imagesaver(reader.acquirenextimage(), mfile));         }      };

the problem callback gets called when image capture user , not on eacg frame sent preview screen camera.

here tried add:

private void createcamerapreviewsession() {         try {             surfacetexture texture = mtextureview.getsurfacetexture();             assert texture != null;              // configure size of default buffer size of camera preview want.             texture.setdefaultbuffersize(mpreviewsize.getwidth(), mpreviewsize.getheight());              // output surface need start preview.             surface surface = new surface(texture);              // set capturerequest.builder output surface.             mpreviewrequestbuilder                     = mcameradevice.createcapturerequest(cameradevice.template_preview);             mpreviewrequestbuilder.addtarget(surface);              // here, create cameracapturesession camera preview.             mcameradevice.createcapturesession(arrays.aslist(surface, mimagereader.getsurface()),                     new cameracapturesession.statecallback() {                          @override                         public void onconfigured(cameracapturesession cameracapturesession) {                             // camera closed                             if (null == mcameradevice) {                                 return;                             }                              // when session ready, start displaying preview.                             mcapturesession = cameracapturesession;                             try {                                 // auto focus should continuous camera preview.                                 mpreviewrequestbuilder.set(capturerequest.control_af_mode,                                         capturerequest.control_af_mode_continuous_picture);                                 // flash automatically enabled when necessary.                                 mpreviewrequestbuilder.set(capturerequest.control_ae_mode,                                         capturerequest.control_ae_mode_on_auto_flash);                                  // finally, start displaying camera preview.                                 mpreviewrequest = mpreviewrequestbuilder.build();                                 mcapturesession.setrepeatingrequest(mpreviewrequest,                                         mcapturecallback, mbackgroundhandler);                                 //mpreviewrequestbuilder.addtarget(mimagereader.getsurface());                             } catch (cameraaccessexception e) {                                 e.printstacktrace();                             }                         }                          @override                         public void onconfigurefailed(cameracapturesession cameracapturesession) {                             showtoast("failed");                         }                     }, null             );              /**todo added capturing aeach frame*/             // capturerequest.builder use take picture.             final capturerequest.builder capturebuilder =                     mcameradevice.createcapturerequest(cameradevice.template_still_capture);             capturebuilder.addtarget(mimagereader.getsurface());              // use same ae , af modes preview.             capturebuilder.set(capturerequest.control_af_mode,                     capturerequest.control_af_mode_continuous_picture);             capturebuilder.set(capturerequest.control_ae_mode,                     capturerequest.control_ae_mode_on_auto_flash);              /**end added capture each frame*/           } catch (cameraaccessexception e) {             e.printstacktrace();         }     }

instead of creating new instance of capturerequest.builder, add imagereader's surface mpreviewrequestbuilder's output target.


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