Camera: Add camera type to ICameraService.getNumberOfCameras.

Also determine the number of 'normal' cameras present on
camera service startup, and ensure that all normal cameras have
IDs lower than the 'strange' cameras.

Bug: 23194168
Change-Id: I1f7b14825cb52707de698a955f85da1eaa932663

2 files changed, 96 insertions, 14 deletions

diff --git a/services/camera/libcameraservice/CameraService.cpp b/services/camera/libcameraservice/CameraService.cpp
index 92df4e3..43a8ec4 100644
--- a/services/camera/libcameraservice/CameraService.cpp
+++ b/services/camera/libcameraservice/CameraService.cpp
@@ -171,6 +171,7 @@ void CameraService::onFirstRef()
     }
 
     mNumberOfCameras = mModule->getNumberOfCameras();
+    mNumberOfNormalCameras = mNumberOfCameras;
 
     mFlashlight = new CameraFlashlight(*mModule, *this);
     status_t res = mFlashlight->findFlashUnits();
@@ -179,27 +180,41 @@ void CameraService::onFirstRef()
         ALOGE("Failed to find flash units.");
     }
 
+    int latestStrangeCameraId = INT_MAX;
     for (int i = 0; i < mNumberOfCameras; i++) {
         String8 cameraId = String8::format("%d", i);
 
+        // Get camera info
+
+        struct camera_info info;
+        bool haveInfo = true;
+        status_t rc = mModule->getCameraInfo(i, &info);
+        if (rc != NO_ERROR) {
+            ALOGE("%s: Received error loading camera info for device %d, cost and"
+                    " conflicting devices fields set to defaults for this device.",
+                    __FUNCTION__, i);
+            haveInfo = false;
+        }
+
+        // Check for backwards-compatibility support
+        if (haveInfo) {
+            if (checkCameraCapabilities(i, info, &latestStrangeCameraId) != OK) {
+                delete mModule;
+                mModule = nullptr;
+                return;
+            }
+        }
+
         // Defaults to use for cost and conflicting devices
         int cost = 100;
         char** conflicting_devices = nullptr;
         size_t conflicting_devices_length = 0;
 
         // If using post-2.4 module version, query the cost + conflicting devices from the HAL
-        if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_4) {
-            struct camera_info info;
-            status_t rc = mModule->getCameraInfo(i, &info);
-            if (rc == NO_ERROR) {
-                cost = info.resource_cost;
-                conflicting_devices = info.conflicting_devices;
-                conflicting_devices_length = info.conflicting_devices_length;
-            } else {
-                ALOGE("%s: Received error loading camera info for device %d, cost and"
-                        " conflicting devices fields set to defaults for this device.",
-                        __FUNCTION__, i);
-            }
+        if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_4 && haveInfo) {
+            cost = info.resource_cost;
+            conflicting_devices = info.conflicting_devices;
+            conflicting_devices_length = info.conflicting_devices_length;
         }
 
         std::set<String8> conflicting;
@@ -382,9 +397,21 @@ void CameraService::onTorchStatusChangedLocked(const String8& cameraId,
     }
 }
 
-
 int32_t CameraService::getNumberOfCameras() {
-    return mNumberOfCameras;
+    return getNumberOfCameras(CAMERA_TYPE_BACKWARD_COMPATIBLE);
+}
+
+int32_t CameraService::getNumberOfCameras(int type) {
+    switch (type) {
+        case CAMERA_TYPE_BACKWARD_COMPATIBLE:
+            return mNumberOfNormalCameras;
+        case CAMERA_TYPE_ALL:
+            return mNumberOfCameras;
+        default:
+            ALOGW("%s: Unknown camera type %d, returning 0",
+                    __FUNCTION__, type);
+            return 0;
+    }
 }
 
 status_t CameraService::getCameraInfo(int cameraId,
@@ -1494,6 +1521,53 @@ bool CameraService::evictClientIdByRemote(const wp<IBinder>& remote) {
 }
 
 
+/**
+ * Check camera capabilities, such as support for basic color operation
+ */
+int CameraService::checkCameraCapabilities(int id, camera_info info, int *latestStrangeCameraId) {
+
+    // Assume all devices pre-v3.3 are backward-compatible
+    bool isBackwardCompatible = true;
+    if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_0
+            && info.device_version >= CAMERA_DEVICE_API_VERSION_3_3) {
+        isBackwardCompatible = false;
+        status_t res;
+        camera_metadata_ro_entry_t caps;
+        res = find_camera_metadata_ro_entry(
+            info.static_camera_characteristics,
+            ANDROID_REQUEST_AVAILABLE_CAPABILITIES,
+            &caps);
+        if (res != 0) {
+            ALOGW("%s: Unable to find camera capabilities for camera device %d",
+                    __FUNCTION__, id);
+            caps.count = 0;
+        }
+        for (size_t i = 0; i < caps.count; i++) {
+            if (caps.data.u8[i] ==
+                    ANDROID_REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE) {
+                isBackwardCompatible = true;
+                break;
+            }
+        }
+    }
+
+    if (!isBackwardCompatible) {
+        mNumberOfNormalCameras--;
+        *latestStrangeCameraId = id;
+    } else {
+        if (id > *latestStrangeCameraId) {
+            ALOGE("%s: Normal camera ID %d higher than strange camera ID %d. "
+                    "This is not allowed due backward-compatibility requirements",
+                    __FUNCTION__, id, *latestStrangeCameraId);
+            logServiceError("Invalid order of camera devices", ENODEV);
+            mNumberOfCameras = 0;
+            mNumberOfNormalCameras = 0;
+            return INVALID_OPERATION;
+        }
+    }
+    return OK;
+}
+
 std::shared_ptr<CameraService::CameraState> CameraService::getCameraState(
         const String8& cameraId) const {
     std::shared_ptr<CameraState> state;
diff --git a/services/camera/libcameraservice/CameraService.h b/services/camera/libcameraservice/CameraService.h
index 3298772..7f4d43f 100644
--- a/services/camera/libcameraservice/CameraService.h
+++ b/services/camera/libcameraservice/CameraService.h
@@ -100,7 +100,9 @@ public:
 
     /////////////////////////////////////////////////////////////////////
     // ICameraService
+    virtual int32_t     getNumberOfCameras(int type);
     virtual int32_t     getNumberOfCameras();
+
     virtual status_t    getCameraInfo(int cameraId,
                                       struct CameraInfo* cameraInfo);
     virtual status_t    getCameraCharacteristics(int cameraId,
@@ -509,6 +511,11 @@ private:
     std::set<userid_t> mAllowedUsers;
 
     /**
+     * Check camera capabilities, such as support for basic color operation
+     */
+    int checkCameraCapabilities(int id, camera_info info, int *latestStrangeCameraId);
+
+    /**
      * Get the camera state for a given camera id.
      *
      * This acquires mCameraStatesLock.
@@ -610,6 +617,7 @@ private:
     void dumpEventLog(int fd);
 
     int                 mNumberOfCameras;
+    int                 mNumberOfNormalCameras;
 
     // sounds
     MediaPlayer*        newMediaPlayer(const char *file);