优化拍照

测光如果50次还不能锁定，则取消重新开始测光

app/src/main/cpp/camera2/ndkcamera.cpp

@@ -124,6 +124,8 @@ NdkCamera::NdkCamera(int32_t width, int32_t height, const NdkCamera::CAMERA_PARA
 
     sceneModeSupported = false;
 
+    numberOfPrecaptures = 0;
+
     activeArraySize[0] = 0;
     activeArraySize[1] = 0;
 
@@ -625,7 +627,7 @@ int NdkCamera::open(const std::string& cameraId) {
             // status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AF_TRIGGER, 1, &trig);
 
             trig = ACAMERA_CONTROL_AF_TRIGGER_START;
-            // status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AF_TRIGGER, 1, &trig);
+            status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AF_TRIGGER, 1, &trig);
         }
         if (status == ACAMERA_OK)
         {
@@ -641,13 +643,13 @@ int NdkCamera::open(const std::string& cameraId) {
 
     // std::this_thread::sleep_for(std::chrono::milliseconds(128));
 
-    {
     if (m_params.sceneMode != 0)
     {
         uint8_t sceneMode = m_params.sceneMode;
         status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_SCENE_MODE, 1, &sceneMode);
     }
 
+    {
         if (m_params.autoExposure)
         {
             uint8_t aeMode = ACAMERA_CONTROL_AE_MODE_ON;
@@ -686,13 +688,6 @@ int NdkCamera::open(const std::string& cameraId) {
                 }
             }
 
-            uint8_t aePrecatureTrigger = ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_START;
-            status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER, 1, &aePrecatureTrigger);
-            if (status == ACAMERA_OK)
-            {
-                m_imagesCaptured = ~0;
-            }
-
             if (aeLockAvailable)
             {
                 uint8_t aeLock = ACAMERA_CONTROL_AE_LOCK_ON;
@@ -705,6 +700,16 @@ int NdkCamera::open(const std::string& cameraId) {
             {
                 XYLOG(XYLOG_SEVERITY_DEBUG, "AE_Lock Not Supported");
             }
+
+            uint8_t aePrecatureTrigger = ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_START;
+            status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER, 1, &aePrecatureTrigger);
+            XYLOG(XYLOG_SEVERITY_DEBUG, "Trigger PRECAPTURE status=%d", (int)status);
+            if (status == ACAMERA_OK)
+            {
+                m_imagesCaptured = ~0;
+            }
+
+
             // ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AE_LOCK, 1, &aeLockOff);
         }
         else
@@ -1241,11 +1246,26 @@ void NdkCamera::onCaptureCompleted(ACameraCaptureSession* session, ACaptureReque
 
     if (m_params.autoExposure != 0)
     {
+        if (mResult.aeState == ACAMERA_CONTROL_AE_STATE_SEARCHING)
+        {
+            numberOfPrecaptures ++;
+            if (numberOfPrecaptures > 50)
+            {
+                uint8_t aePrecatureTrigger = ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_CANCEL;
+                status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER, 1, &aePrecatureTrigger);
+
+                aePrecatureTrigger = ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_START;
+                status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER, 1, &aePrecatureTrigger);
+
+                XYLOG(XYLOG_SEVERITY_WARNING, "Retrigger PRECAPTURE status=%d AES=%u", (int)status, (unsigned int)mResult.aeState);
+                numberOfPrecaptures = 0;
+            }
+        }
         if (mResult.aeState == ACAMERA_CONTROL_AE_STATE_PRECAPTURE)
         {
             uint8_t aePrecatureTrigger = ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_START;
             status = ACaptureRequest_setEntry_u8(capture_request, ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER, 1, &aePrecatureTrigger);
-            XYLOG(XYLOG_SEVERITY_DEBUG, "PreCapture AES=%u", (unsigned int)mResult.aeState);
+            XYLOG(XYLOG_SEVERITY_DEBUG, "Trigger PRECAPTURE status=%d AES=%u", (int)status, (unsigned int)mResult.aeState);
         }
     }
 

app/src/main/cpp/camera2/ndkcamera.h

@@ -155,6 +155,7 @@ protected:
     bool aeLockAvailable;
     bool awbLockAvailable;
 
+    uint64_t numberOfPrecaptures;
     bool lightDetected;
 
     // int64_t exposureTime_;