title: Android camera2 speed-up
body: <p>I need to speed-up capturing of camera2 API. I tried to build "android-Camera2Basic" project from google samples. For default capture request from example:</p>
  
  <pre><code> if (null == activity || null == mCameraDevice) {
              return;
          }
          // This is the CaptureRequest.Builder that we use to take a picture.
          final CaptureRequest.Builder captureBuilder =
                  mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
          captureBuilder.addTarget(mImageReader.getSurface());
  
          // Use the same AE and AF modes as the 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);
  
          // Orientation
          int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
          captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
  
          CameraCaptureSession.CaptureCallback CaptureCallback
                  = new CameraCaptureSession.CaptureCallback() {
  
              @Override
              public void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request,
                                             TotalCaptureResult result) {
                  showToast("Saved: " + mFile);
                  unlockFocus();
              }
          };
  
          mCaptureSession.stopRepeating();
          mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);
  </code></pre>
  
  <p>It takes 200-300ms from send request</p>
  
  <pre><code>mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);
  </code></pre>
  
  <p>And get result in</p>
  
  <pre><code>onImageAvailable(ImageReader reader)
  </code></pre>
  
  <p>Is it possible to reduce this time? I tried set different parameters for capture request, such as TEMPLATE_ZERO_SHUTTER_LAG, NOISE_REDUCTION_MODE_OFF, EDGE_MODE_OFF, etc. But it has no any effect.
  If I try to capture burst, then all images, except first are comes very fast, no more then in 30-40ms. How can I reduce capturing time for first image?</p>