Add video snapshot camera parameter.

The API is still hidden.

bug:5187868

Change-Id: I59e1b5774ca32be049723d1a0887faa90d8884bb
diff --git a/camera/CameraParameters.cpp b/camera/CameraParameters.cpp
index 0eb5d50..0dcab6b 100644
--- a/camera/CameraParameters.cpp
+++ b/camera/CameraParameters.cpp
@@ -87,6 +87,7 @@
 const char CameraParameters::KEY_MAX_NUM_DETECTED_FACES_HW[] = "max-num-detected-faces-hw";
 const char CameraParameters::KEY_MAX_NUM_DETECTED_FACES_SW[] = "max-num-detected-faces-sw";
 const char CameraParameters::KEY_RECORDING_HINT[] = "recording-hint";
+const char CameraParameters::KEY_VIDEO_SNAPSHOT_SUPPORTED[] = "video-snapshot-supported";
 
 const char CameraParameters::TRUE[] = "true";
 const char CameraParameters::FALSE[] = "false";
diff --git a/include/camera/CameraParameters.h b/include/camera/CameraParameters.h
index 6c91dfc..4a4bcfb 100644
--- a/include/camera/CameraParameters.h
+++ b/include/camera/CameraParameters.h
@@ -495,6 +495,25 @@
     // Example value: "true" or "false". Read/write.
     static const char KEY_RECORDING_HINT[];
 
+    // Returns true if video snapshot is supported. That is, applications
+    // can call Camera.takePicture during recording. Applications do not need to
+    // call Camera.startPreview after taking a picture. The preview will be
+    // still active. Other than that, taking a picture during recording is
+    // identical to taking a picture normally. All settings and methods related
+    // to takePicture work identically. Ex: KEY_PICTURE_SIZE,
+    // KEY_SUPPORTED_PICTURE_SIZES, KEY_JPEG_QUALITY, KEY_ROTATION, and etc.
+    // The picture will have an EXIF header. FLASH_MODE_AUTO and FLASH_MODE_ON
+    // also still work, but the video will record the flash.
+    //
+    // Applications can set shutter callback as null to avoid the shutter
+    // sound. It is also recommended to set raw picture and post view callbacks
+    // to null to avoid the interrupt of preview display.
+    //
+    // Field-of-view of the recorded video may be different from that of the
+    // captured pictures.
+    // Example value: "true" or "false". Read only.
+    static const char KEY_VIDEO_SNAPSHOT_SUPPORTED[];
+
     // Value for KEY_ZOOM_SUPPORTED or KEY_SMOOTH_ZOOM_SUPPORTED.
     static const char TRUE[];
     static const char FALSE[];
diff --git a/services/camera/libcameraservice/CameraService.cpp b/services/camera/libcameraservice/CameraService.cpp
index e193be0..b178fd9 100644
--- a/services/camera/libcameraservice/CameraService.cpp
+++ b/services/camera/libcameraservice/CameraService.cpp
@@ -769,11 +769,6 @@
     status_t result = checkPidAndHardware();
     if (result != NO_ERROR) return result;
 
-    if (mHardware->recordingEnabled()) {
-        LOGE("Cannot take picture during recording.");
-        return INVALID_OPERATION;
-    }
-
     if ((msgType & CAMERA_MSG_RAW_IMAGE) &&
         (msgType & CAMERA_MSG_RAW_IMAGE_NOTIFY)) {
         LOGE("CAMERA_MSG_RAW_IMAGE and CAMERA_MSG_RAW_IMAGE_NOTIFY"