camera3: Pass vendor tags through binder.

Bug: 12134423

- Adds a class for parceling vendor tag definitions.
- Passes vendor tag definitions to clients of the camera service.
- Switches over to new vendor tag mechanism when reading from HAL.

Change-Id: Icef3fe9e67160767bdb8244ac49c85b68b497123

2 files changed, 126 insertions, 0 deletions

diff --git a/include/camera/ICameraService.h b/include/camera/ICameraService.h
index f342122..6ccbf67 100644
--- a/include/camera/ICameraService.h
+++ b/include/camera/ICameraService.h
@@ -31,6 +31,7 @@ class ICameraServiceListener;
 class ICameraDeviceUser;
 class ICameraDeviceCallbacks;
 class CameraMetadata;
+class VendorTagDescriptor;
 
 class ICameraService : public IInterface
 {
@@ -47,6 +48,7 @@ public:
         ADD_LISTENER,
         REMOVE_LISTENER,
         GET_CAMERA_CHARACTERISTICS,
+        GET_CAMERA_VENDOR_TAG_DESCRIPTOR,
     };
 
     enum {
@@ -63,6 +65,8 @@ public:
     virtual status_t getCameraCharacteristics(int cameraId,
                                               CameraMetadata* cameraInfo) = 0;
 
+    virtual status_t getCameraVendorTagDescriptor(sp<VendorTagDescriptor>& desc) = 0;
+
     // Returns 'OK' if operation succeeded
     // - Errors: ALREADY_EXISTS if the listener was already added
     virtual status_t addListener(const sp<ICameraServiceListener>& listener)
diff --git a/include/camera/VendorTagDescriptor.h b/include/camera/VendorTagDescriptor.h
new file mode 100644
index 0000000..0fefe1a
--- /dev/null
+++ b/include/camera/VendorTagDescriptor.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef VENDOR_TAG_DESCRIPTOR_H
+
+#include <utils/KeyedVector.h>
+#include <utils/String8.h>
+#include <utils/RefBase.h>
+#include <system/camera_vendor_tags.h>
+
+#include <stdint.h>
+
+namespace android {
+
+class Parcel;
+
+/**
+ * VendorTagDescriptor objects are parcelable containers for the vendor tag
+ * definitions provided, and are typically used to pass the vendor tag
+ * information enumerated by the HAL to clients of the camera service.
+ */
+class VendorTagDescriptor
+        : public LightRefBase<VendorTagDescriptor> {
+    public:
+        virtual ~VendorTagDescriptor();
+
+        /**
+         * The following 'get*' methods implement the corresponding
+         * functions defined in
+         * system/media/camera/include/system/camera_vendor_tags.h
+         */
+
+        // Returns the number of vendor tags defined.
+        int getTagCount() const;
+
+        // Returns an array containing the id's of vendor tags defined.
+        void getTagArray(uint32_t* tagArray) const;
+
+        // Returns the section name string for a given vendor tag id.
+        const char* getSectionName(uint32_t tag) const;
+
+        // Returns the tag name string for a given vendor tag id.
+        const char* getTagName(uint32_t tag) const;
+
+        // Returns the tag type for a given vendor tag id.
+        int getTagType(uint32_t tag) const;
+
+        /**
+         * Write the VendorTagDescriptor object into the given parcel.
+         *
+         * Returns OK on success, or a negative error code.
+         */
+        status_t writeToParcel(/*out*/Parcel* parcel) const;
+
+        // Static methods:
+
+        /**
+         * Create a VendorTagDescriptor object from the given parcel.
+         *
+         * Returns OK on success, or a negative error code.
+         */
+        static status_t createFromParcel(const Parcel* parcel,
+                /*out*/
+                sp<VendorTagDescriptor>& descriptor);
+
+        /**
+         * Create a VendorTagDescriptor object from the given vendor_tag_ops_t
+         * struct.
+         *
+         * Returns OK on success, or a negative error code.
+         */
+        static status_t createDescriptorFromOps(const vendor_tag_ops_t* vOps,
+                /*out*/
+                sp<VendorTagDescriptor>& descriptor);
+
+        /**
+         * Sets the global vendor tag descriptor to use for this process.
+         * Camera metadata operations that access vendor tags will use the
+         * vendor tag definitions set this way.
+         *
+         * Returns OK on success, or a negative error code.
+         */
+        static status_t setAsGlobalVendorTagDescriptor(sp<VendorTagDescriptor>& desc);
+
+        /**
+         * Clears the global vendor tag descriptor used by this process.
+         */
+        static void clearGlobalVendorTagDescriptor();
+
+        /**
+         * Returns the global vendor tag descriptor used by this process.
+         * This will contain NULL if no vendor tags are defined.
+         */
+        static sp<VendorTagDescriptor> getGlobalVendorTagDescriptor();
+    protected:
+        VendorTagDescriptor();
+        KeyedVector<uint32_t, String8> mTagToNameMap;
+        KeyedVector<uint32_t, String8> mTagToSectionMap;
+        KeyedVector<uint32_t, int32_t> mTagToTypeMap;
+        // must be int32_t to be compatible with Parcel::writeInt32
+        int32_t mTagCount;
+    private:
+        vendor_tag_ops mVendorOps;
+};
+
+} /* namespace android */
+
+#define VENDOR_TAG_DESCRIPTOR_H
+#endif /* VENDOR_TAG_DESCRIPTOR_H */