SnapdragonCamera: Longshot with Burst Functionality.

This is a new Longshot feature where in the snapshot frames
captured at ISP is @ 3fps and output JPEG encoded rate is @ 1.2 fps.

This can be enabled by setting following setprop with
the maximum number of snapshots.
adb shell setprop persist.camera.longshot.max <max_number>
e.g.:adb shell setprop persist.camera.longshot.max 10
If the number is -1, then the existing Longshot will be used.

Main changes:
1) The number of Snapshot/Preview/Metadata buffers are increased to
make sure no frames will be dropped @ ISP and to maintain burst fps.
e.g.: For max number of 10 snapshots, Snapshot buffers are increased to 9
from existing 6.
This buffer numbers are derived considering snapshot YUV frames @ 3 fps
and JPEG encoding @ 1.2 fps.
2) Shutter will be played after receiving YUV frame instead of reprocess frame.
3) New Longshot stop command is sent after receiving all the required YUV
callbacks or releasing the shutter before reaching Max number.
4) Existing Longshot off command is sent after receiving all JPEG CB.s for the issued
TakePictures() and also shutter button will be disabled until all the JPEG
callbacks are received.

Change-Id: Id0c21aeb67245530768bf3ab859d39dea7e2bc40

1 files changed, 45 insertions, 19 deletions

diff --git a/src/com/android/camera/PhotoModule.java b/src/com/android/camera/PhotoModule.java
index 906b79c91..273c205f7 100644
--- a/src/com/android/camera/PhotoModule.java
+++ b/src/com/android/camera/PhotoModule.java
@@ -124,6 +124,7 @@ public class PhotoModule
     private int mSnapshotMode;
     private int mBurstSnapNum = 1;
     private int mReceivedSnapNum = 0;
+    private int mLongshotSnapNum = 0;
     public boolean mFaceDetectionEnabled = false;
     private DrawAutoHDR mDrawAutoHDR;
    /*Histogram variables*/
@@ -212,6 +213,8 @@ public class PhotoModule
     private static final String PERSIST_LONG_SAVE = "persist.camera.longshot.save";
     private static final String PERSIST_PREVIEW_RESTART = "persist.camera.feature.restart";
     private static final String PERSIST_CAPTURE_ANIMATION = "persist.camera.capture.animate";
+    private static final String PERSIST_LONGSHOT_MAX_SNAP = "persist.camera.longshot.max";
+    private static int mLongShotMaxSnap = -1;
 
     private static final int MINIMUM_BRIGHTNESS = 0;
     private static final int MAXIMUM_BRIGHTNESS = 6;
@@ -967,8 +970,17 @@ public class PhotoModule
             Log.e(TAG, "[KPI Perf] PROFILE_SHUTTER_LAG mShutterLag = " + mShutterLag + "ms");
             synchronized(mCameraDevice) {
 
+                if (++mLongshotSnapNum >= mLongShotMaxSnap &&
+                    (mLongShotMaxSnap != -1)) {
+                    mLongshotActive = false;
+                    mUI.enableShutter(false);
+                    mCameraDevice.stopLongshot();
+                    return;
+                }
+
                 if (mCameraState != LONGSHOT ||
                     !mLongshotActive) {
+                    mCameraDevice.stopLongshot();
                     return;
                 }
 
@@ -1170,7 +1182,9 @@ public class PhotoModule
 
         @Override
         public void onPictureTaken(final byte [] jpegData, CameraProxy camera) {
-            mUI.enableShutter(true);
+            if (mCameraState != LONGSHOT) {
+                mUI.enableShutter(true);
+            }
             if (mPaused) {
                 return;
             }
@@ -1209,19 +1223,25 @@ public class PhotoModule
 
             mFocusManager.updateFocusUI(); // Ensure focus indicator is hidden.
 
+            if (isLongshotDone()) {
+                mCameraDevice.setLongshot(false);
+            }
+
             boolean needRestartPreview = !mIsImageCaptureIntent
                     && !mPreviewRestartSupport
                     && (mCameraState != LONGSHOT)
                     && (mSnapshotMode != CameraInfo.CAMERA_SUPPORT_MODE_ZSL)
-                    && (mReceivedSnapNum == mBurstSnapNum);
+                    && ((mReceivedSnapNum == mBurstSnapNum) && (mCameraState != LONGSHOT));
+            needRestartPreview |= (isLongshotDone() && !mFocusManager.isZslEnabled());
             if (needRestartPreview) {
                 setupPreview();
                 if (CameraUtil.FOCUS_MODE_CONTINUOUS_PICTURE.equals(
                     mFocusManager.getFocusMode())) {
                     mCameraDevice.cancelAutoFocus();
                 }
-            } else if ((mReceivedSnapNum == mBurstSnapNum)
-                        && (mCameraState != LONGSHOT)){
+            } else if (((mCameraState != LONGSHOT) && (mReceivedSnapNum == mBurstSnapNum))
+                        || isLongshotDone()){
+                mUI.enableShutter(true);
                 mFocusManager.resetTouchFocus();
                 if (CameraUtil.FOCUS_MODE_CONTINUOUS_PICTURE.equals(
                         mFocusManager.getFocusMode())) {
@@ -1315,7 +1335,8 @@ public class PhotoModule
                             }
                         }
                         // Animate capture with real jpeg data instead of a preview frame.
-                        if (mCameraState != LONGSHOT) {
+                        if ((mCameraState != LONGSHOT) ||
+                            isLongshotDone()) {
                             Size pic_size = mParameters.getPictureSize();
                             if ((pic_size.width <= 352) && (pic_size.height<= 288)) {
                                 mUI.setDownFactor(2); //Downsample by 2 for CIF & below
@@ -1356,6 +1377,10 @@ public class PhotoModule
                         mJpegPictureCallbackTime = 0;
                     }
 
+                    if (isLongshotDone()) {
+                        mLongshotSnapNum = 0;
+                    }
+
                     if (mHiston && (mSnapshotMode ==CameraInfo.CAMERA_SUPPORT_MODE_ZSL)) {
                         mActivity.runOnUiThread(new Runnable() {
                         public void run() {
@@ -1514,6 +1539,7 @@ public class PhotoModule
         }
 
         if (mCameraState == LONGSHOT) {
+            mLongshotSnapNum = 0;
             mCameraDevice.setLongshot(true);
         }
 
@@ -2019,19 +2045,7 @@ public class PhotoModule
         synchronized(mCameraDevice) {
            if (mCameraState == LONGSHOT) {
                mLongshotActive = false;
-               mCameraDevice.setLongshot(false);
-               mUI.animateCapture(mLastJpegData, mLastJpegOrientation, mMirror);
-               if (!mFocusManager.isZslEnabled()) {
-                   setupPreview();
-               } else {
-                   setCameraState(IDLE);
-                   mFocusManager.resetTouchFocus();
-                   if (CameraUtil.FOCUS_MODE_CONTINUOUS_PICTURE.equals(
-                           mFocusManager.getFocusMode())) {
-                       mCameraDevice.cancelAutoFocus();
-                   }
-                   mUI.resumeFaceDetection();
-               }
+               mUI.enableShutter(false);
            }
         }
 
@@ -2218,7 +2232,7 @@ public class PhotoModule
 
     private void updateRemainingPhotos() {
         if (mJpegFileSizeEstimation != 0) {
-            mRemainingPhotos = (int) 
+            mRemainingPhotos = (int)
                     ((mActivity.getStorageSpaceBytes() - Storage.LOW_STORAGE_THRESHOLD_BYTES)
                     / mJpegFileSizeEstimation);
         } else {
@@ -2656,6 +2670,10 @@ public class PhotoModule
     @Override
     public void stopPreview() {
         if (mCameraDevice != null && mCameraState != PREVIEW_STOPPED) {
+            if (mCameraState == LONGSHOT) {
+                mCameraDevice.setLongshot(false);
+                mLongshotActive = false;
+            }
             Log.v(TAG, "stopPreview");
             mCameraDevice.stopPreview();
         }
@@ -3214,6 +3232,9 @@ public class PhotoModule
         }
 
         updatePowerMode();
+
+        mLongShotMaxSnap = SystemProperties.getInt(PERSIST_LONGSHOT_MAX_SNAP, -1);
+        mParameters.set("max-longshot-snap",mLongShotMaxSnap);
     }
 
     private int estimateJpegFileSize(final Size size, final String quality) {
@@ -4440,6 +4461,11 @@ public class PhotoModule
         mCameraDevice.setParameters(mParameters);
         mParameters = mCameraDevice.getParameters();
     }
+
+    public boolean isLongshotDone() {
+        return ((mCameraState == LONGSHOT) && (mLongshotSnapNum == mReceivedSnapNum) &&
+                !mLongshotActive);
+    }
 }
 
 /* Below is no longer needed, except to get rid of compile error