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/*
* Copyright 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 SYSTEM_MEDIA_INCLUDE_ANDROID_CAMERA_VENDOR_TAGS_H
#define SYSTEM_MEDIA_INCLUDE_ANDROID_CAMERA_VENDOR_TAGS_H
#ifdef __cplusplus
extern "C" {
#endif
#define CAMERA_METADATA_VENDOR_TAG_BOUNDARY 0x80000000u
/**
* Vendor tags:
*
* This structure contains basic functions for enumerating an immutable set of
* vendor-defined camera metadata tags, and querying static information about
* their structure/type. The intended use of this information is to validate
* the structure of metadata returned by the camera HAL, and to allow vendor-
* defined metadata tags to be visible in application facing camera API.
*/
typedef struct vendor_tag_ops vendor_tag_ops_t;
struct vendor_tag_ops {
/**
* Get the number of vendor tags supported on this platform. Used to
* calculate the size of buffer needed for holding the array of all tags
* returned by get_all_tags(). This must return -1 on error.
*/
int (*get_tag_count)(const vendor_tag_ops_t *v);
/**
* Fill an array with all of the supported vendor tags on this platform.
* get_tag_count() must return the number of tags supported, and
* tag_array will be allocated with enough space to hold the number of tags
* returned by get_tag_count().
*/
void (*get_all_tags)(const vendor_tag_ops_t *v, uint32_t *tag_array);
/**
* Get the vendor section name for a vendor-specified entry tag. This will
* only be called for vendor-defined tags.
*
* The naming convention for the vendor-specific section names should
* follow a style similar to the Java package style. For example,
* CameraZoom Inc. must prefix their sections with "com.camerazoom."
* This must return NULL if the tag is outside the bounds of
* vendor-defined sections.
*
* There may be different vendor-defined tag sections, for example the
* phone maker, the chipset maker, and the camera module maker may each
* have their own "com.vendor."-prefixed section.
*
* The memory pointed to by the return value must remain valid for the
* lifetime of the module, and is owned by the module.
*/
const char *(*get_section_name)(const vendor_tag_ops_t *v, uint32_t tag);
/**
* Get the tag name for a vendor-specified entry tag. This is only called
* for vendor-defined tags, and must return NULL if it is not a
* vendor-defined tag.
*
* The memory pointed to by the return value must remain valid for the
* lifetime of the module, and is owned by the module.
*/
const char *(*get_tag_name)(const vendor_tag_ops_t *v, uint32_t tag);
/**
* Get tag type for a vendor-specified entry tag. The type returned must be
* a valid type defined in camera_metadata.h. This method is only called
* for tags >= CAMERA_METADATA_VENDOR_TAG_BOUNDARY, and must return
* -1 if the tag is outside the bounds of the vendor-defined sections.
*/
int (*get_tag_type)(const vendor_tag_ops_t *v, uint32_t tag);
/* Reserved for future use. These must be initialized to NULL. */
void* reserved[8];
};
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* SYSTEM_MEDIA_INCLUDE_ANDROID_CAMERA_VENDOR_TAGS_H */
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