commit 96e39d99cd1b838cf1e501ac988b4f89fb126745
author insup.choi <insup.choi@lge.com> Tue Sep 25 15:57:06 2012 -0700
committer Iliyan Malchev <malchev@google.com> Wed Sep 26 14:55:15 2012 -0700
tree d9cfb277bcfebc2238097339ef3d6c74eccab89d
parent 1316fe96f9386208a3a03c72f816830d7fa26576

camera: add exposure-time value in EXIF

Bug: 7234966

for tuning sensor brightness, sensor vendor want to extract ev value
from picture via exit header. now mako can support ev value.

Change-Id: Ie27586be4f23b9001da767dcb09cc6d0f4f6a5b2
Signed-off-by: Iliyan Malchev <malchev@google.com>

camera/QCameraHWI.h

diff --git a/camera/QCameraHWI.h b/camera/QCameraHWI.h
old mode 100755
new mode 100644
index 1bd27a5..d530e82
--- a/camera/QCameraHWI.h
+++ b/camera/QCameraHWI.h
@@ -221,6 +221,7 @@
     rat_t       focalLength;
     uint16_t    flashMode;
     uint16_t    isoSpeed;
+    rat_t       exposure_time;
 
     bool        mAltitude;
     bool        mLongitude;

camera/QCameraHWI_Parm.cpp

diff --git a/camera/QCameraHWI_Parm.cpp b/camera/QCameraHWI_Parm.cpp
old mode 100755
new mode 100644
index 70dedf6..b57c599
--- a/camera/QCameraHWI_Parm.cpp
+++ b/camera/QCameraHWI_Parm.cpp
@@ -3987,17 +3987,30 @@
     rc = cam_config_get_parm(mCameraId, MM_CAMERA_PARM_FOCAL_LENGTH,(void *)&focusDistances);
     if (rc == MM_CAMERA_OK){
         uint16_t temp1;
+        rat_t temp;
         if(mIsoValue == 0) // ISO is auto
         {
             temp1 = (uint16_t)(focusDistances.real_gain + 0.5)*100;
             mExifValues.isoSpeed = temp1;
-            ALOGE("zc: The new ISO value is %d", temp1);
+            ALOGV("zc: The new ISO value is %d", temp1);
         }
         else{
             temp1 = iso_speed_values[mIsoValue];
             mExifValues.isoSpeed = temp1;
-            ALOGE("zc: else The new ISO value is %d", temp1);
+            ALOGV("zc: else The new ISO value is %d", temp1);
         }
+
+        if(focusDistances.exp_time <= 0) // avoid zero-divide problem
+            focusDistances.exp_time = 0.01668; // expoure time will be 1/60 s
+
+        uint16_t temp2 = (uint16_t)(focusDistances.exp_time * 100000);
+        temp2 = (uint16_t)(100000 / temp2);
+        temp.num = 1;
+        temp.denom = temp2;
+        memcpy(&mExifValues.exposure_time, &temp, sizeof(mExifValues.exposure_time));
+        addExifTag(EXIFTAGID_EXPOSURE_TIME, EXIF_RATIONAL, 1, 1, (void *)&mExifValues.exposure_time);
+
+        ALOGV(" The exposure value is %f", temp2);
     }
     //get time and date from system
     time_t rawtime;