| /* |
| * Copyright (C) 2012 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. |
| */ |
| |
| // FIXME: add well-defined names for cameras |
| |
| #ifndef ANDROID_INCLUDE_CAMERA_COMMON_H |
| #define ANDROID_INCLUDE_CAMERA_COMMON_H |
| |
| #include <stdint.h> |
| #include <stdbool.h> |
| #include <sys/cdefs.h> |
| #include <sys/types.h> |
| #include <cutils/native_handle.h> |
| #include <system/camera.h> |
| #include <system/camera_vendor_tags.h> |
| #include <hardware/hardware.h> |
| #include <hardware/gralloc.h> |
| |
| __BEGIN_DECLS |
| |
| /** |
| * The id of this module |
| */ |
| #define CAMERA_HARDWARE_MODULE_ID "camera" |
| |
| /** |
| * Module versioning information for the Camera hardware module, based on |
| * camera_module_t.common.module_api_version. The two most significant hex |
| * digits represent the major version, and the two least significant represent |
| * the minor version. |
| * |
| ******************************************************************************* |
| * Versions: 0.X - 1.X [CAMERA_MODULE_API_VERSION_1_0] |
| * |
| * Camera modules that report these version numbers implement the initial |
| * camera module HAL interface. All camera devices openable through this |
| * module support only version 1 of the camera device HAL. The device_version |
| * and static_camera_characteristics fields of camera_info are not valid. Only |
| * the android.hardware.Camera API can be supported by this module and its |
| * devices. |
| * |
| ******************************************************************************* |
| * Version: 2.0 [CAMERA_MODULE_API_VERSION_2_0] |
| * |
| * Camera modules that report this version number implement the second version |
| * of the camera module HAL interface. Camera devices openable through this |
| * module may support either version 1.0 or version 2.0 of the camera device |
| * HAL interface. The device_version field of camera_info is always valid; the |
| * static_camera_characteristics field of camera_info is valid if the |
| * device_version field is 2.0 or higher. |
| * |
| ******************************************************************************* |
| * Version: 2.1 [CAMERA_MODULE_API_VERSION_2_1] |
| * |
| * This camera module version adds support for asynchronous callbacks to the |
| * framework from the camera HAL module, which is used to notify the framework |
| * about changes to the camera module state. Modules that provide a valid |
| * set_callbacks() method must report at least this version number. |
| * |
| ******************************************************************************* |
| * Version: 2.2 [CAMERA_MODULE_API_VERSION_2_2] |
| * |
| * This camera module version adds vendor tag support from the module, and |
| * deprecates the old vendor_tag_query_ops that were previously only |
| * accessible with a device open. |
| * |
| ******************************************************************************* |
| * Version: 2.3 [CAMERA_MODULE_API_VERSION_2_3] |
| * |
| * This camera module version adds open legacy camera HAL device support. |
| * Framework can use it to open the camera device as lower device HAL version |
| * HAL device if the same device can support multiple device API versions. |
| * The standard hardware module open call (common.methods->open) continues |
| * to open the camera device with the latest supported version, which is |
| * also the version listed in camera_info_t.device_version. |
| * |
| ******************************************************************************* |
| * Version: 2.4 [CAMERA_MODULE_API_VERSION_2_4] |
| * |
| * This camera module version adds below API changes: |
| * |
| * 1. Torch mode support. The framework can use it to turn on torch mode for |
| * any camera device that has a flash unit, without opening a camera device. The |
| * camera device has a higher priority accessing the flash unit than the camera |
| * module; opening a camera device will turn off the torch if it had been enabled |
| * through the module interface. When there are any resource conflicts, such as |
| * open() is called to open a camera device, the camera HAL module must notify the |
| * framework through the torch mode status callback that the torch mode has been |
| * turned off. |
| * |
| * 2. External camera (e.g. USB hot-plug camera) support. The API updates specify that |
| * the camera static info is only available when camera is connected and ready to |
| * use for external hot-plug cameras. Calls to get static info will be invalid |
| * calls when camera status is not CAMERA_DEVICE_STATUS_PRESENT. The frameworks |
| * will only count on device status change callbacks to manage the available external |
| * camera list. |
| * |
| * 3. Camera arbitration hints. This module version adds support for explicitly |
| * indicating the number of camera devices that can be simultaneously opened and used. |
| * To specify valid combinations of devices, the resource_cost and conflicting_devices |
| * fields should always be set in the camera_info structure returned by the |
| * get_camera_info call. |
| * |
| * 4. Module initialization method. This will be called by the camera service |
| * right after the HAL module is loaded, to allow for one-time initialization |
| * of the HAL. It is called before any other module methods are invoked. |
| */ |
| |
| /** |
| * Predefined macros for currently-defined version numbers |
| */ |
| |
| /** |
| * All module versions <= HARDWARE_MODULE_API_VERSION(1, 0xFF) must be treated |
| * as CAMERA_MODULE_API_VERSION_1_0 |
| */ |
| #define CAMERA_MODULE_API_VERSION_1_0 HARDWARE_MODULE_API_VERSION(1, 0) |
| #define CAMERA_MODULE_API_VERSION_2_0 HARDWARE_MODULE_API_VERSION(2, 0) |
| #define CAMERA_MODULE_API_VERSION_2_1 HARDWARE_MODULE_API_VERSION(2, 1) |
| #define CAMERA_MODULE_API_VERSION_2_2 HARDWARE_MODULE_API_VERSION(2, 2) |
| #define CAMERA_MODULE_API_VERSION_2_3 HARDWARE_MODULE_API_VERSION(2, 3) |
| #define CAMERA_MODULE_API_VERSION_2_4 HARDWARE_MODULE_API_VERSION(2, 4) |
| |
| #define CAMERA_MODULE_API_VERSION_CURRENT CAMERA_MODULE_API_VERSION_2_4 |
| |
| /** |
| * All device versions <= HARDWARE_DEVICE_API_VERSION(1, 0xFF) must be treated |
| * as CAMERA_DEVICE_API_VERSION_1_0 |
| */ |
| #define CAMERA_DEVICE_API_VERSION_1_0 HARDWARE_DEVICE_API_VERSION(1, 0) // DEPRECATED |
| #define CAMERA_DEVICE_API_VERSION_2_0 HARDWARE_DEVICE_API_VERSION(2, 0) // NO LONGER SUPPORTED |
| #define CAMERA_DEVICE_API_VERSION_2_1 HARDWARE_DEVICE_API_VERSION(2, 1) // NO LONGER SUPPORTED |
| #define CAMERA_DEVICE_API_VERSION_3_0 HARDWARE_DEVICE_API_VERSION(3, 0) // NO LONGER SUPPORTED |
| #define CAMERA_DEVICE_API_VERSION_3_1 HARDWARE_DEVICE_API_VERSION(3, 1) // NO LONGER SUPPORTED |
| #define CAMERA_DEVICE_API_VERSION_3_2 HARDWARE_DEVICE_API_VERSION(3, 2) |
| #define CAMERA_DEVICE_API_VERSION_3_3 HARDWARE_DEVICE_API_VERSION(3, 3) |
| #define CAMERA_DEVICE_API_VERSION_3_4 HARDWARE_DEVICE_API_VERSION(3, 4) |
| |
| // Device version 3.4 is current, older HAL camera device versions are not |
| // recommended for new devices. |
| #define CAMERA_DEVICE_API_VERSION_CURRENT CAMERA_DEVICE_API_VERSION_3_4 |
| |
| /** |
| * Defined in /system/media/camera/include/system/camera_metadata.h |
| */ |
| typedef struct camera_metadata camera_metadata_t; |
| |
| typedef struct camera_info { |
| /** |
| * The direction that the camera faces to. See system/core/include/system/camera.h |
| * for camera facing definitions. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * It should be CAMERA_FACING_BACK or CAMERA_FACING_FRONT. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4 or higher: |
| * |
| * It should be CAMERA_FACING_BACK, CAMERA_FACING_FRONT or |
| * CAMERA_FACING_EXTERNAL. |
| */ |
| int facing; |
| |
| /** |
| * The orientation of the camera image. The value is the angle that the |
| * camera image needs to be rotated clockwise so it shows correctly on the |
| * display in its natural orientation. It should be 0, 90, 180, or 270. |
| * |
| * For example, suppose a device has a naturally tall screen. The |
| * back-facing camera sensor is mounted in landscape. You are looking at the |
| * screen. If the top side of the camera sensor is aligned with the right |
| * edge of the screen in natural orientation, the value should be 90. If the |
| * top side of a front-facing camera sensor is aligned with the right of the |
| * screen, the value should be 270. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * Valid in all camera_module versions. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4 or higher: |
| * |
| * Valid if camera facing is CAMERA_FACING_BACK or CAMERA_FACING_FRONT, |
| * not valid if camera facing is CAMERA_FACING_EXTERNAL. |
| */ |
| int orientation; |
| |
| /** |
| * The value of camera_device_t.common.version. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_1_0: |
| * |
| * Not valid. Can be assumed to be CAMERA_DEVICE_API_VERSION_1_0. Do |
| * not read this field. |
| * |
| * CAMERA_MODULE_API_VERSION_2_0 or higher: |
| * |
| * Always valid |
| * |
| */ |
| uint32_t device_version; |
| |
| /** |
| * The camera's fixed characteristics, which include all static camera metadata |
| * specified in system/media/camera/docs/docs.html. This should be a sorted metadata |
| * buffer, and may not be modified or freed by the caller. The pointer should remain |
| * valid for the lifetime of the camera module, and values in it may not |
| * change after it is returned by get_camera_info(). |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_1_0: |
| * |
| * Not valid. Extra characteristics are not available. Do not read this |
| * field. |
| * |
| * CAMERA_MODULE_API_VERSION_2_0 or higher: |
| * |
| * Valid if device_version >= CAMERA_DEVICE_API_VERSION_2_0. Do not read |
| * otherwise. |
| * |
| */ |
| const camera_metadata_t *static_camera_characteristics; |
| |
| /** |
| * The total resource "cost" of using this camera, represented as an integer |
| * value in the range [0, 100] where 100 represents total usage of the shared |
| * resource that is the limiting bottleneck of the camera subsystem. This may |
| * be a very rough estimate, and is used as a hint to the camera service to |
| * determine when to disallow multiple applications from simultaneously |
| * opening different cameras advertised by the camera service. |
| * |
| * The camera service must be able to simultaneously open and use any |
| * combination of camera devices exposed by the HAL where the sum of |
| * the resource costs of these cameras is <= 100. For determining cost, |
| * each camera device must be assumed to be configured and operating at |
| * the maximally resource-consuming framerate and stream size settings |
| * available in the configuration settings exposed for that device through |
| * the camera metadata. |
| * |
| * The camera service may still attempt to simultaneously open combinations |
| * of camera devices with a total resource cost > 100. This may succeed or |
| * fail. If this succeeds, combinations of configurations that are not |
| * supported due to resource constraints from having multiple open devices |
| * should fail during the configure calls. If the total resource cost is |
| * <= 100, open and configure should never fail for any stream configuration |
| * settings or other device capabilities that would normally succeed for a |
| * device when it is the only open camera device. |
| * |
| * This field will be used to determine whether background applications are |
| * allowed to use this camera device while other applications are using other |
| * camera devices. Note: multiple applications will never be allowed by the |
| * camera service to simultaneously open the same camera device. |
| * |
| * Example use cases: |
| * |
| * Ex. 1: Camera Device 0 = Back Camera |
| * Camera Device 1 = Front Camera |
| * - Using both camera devices causes a large framerate slowdown due to |
| * limited ISP bandwidth. |
| * |
| * Configuration: |
| * |
| * Camera Device 0 - resource_cost = 51 |
| * conflicting_devices = null |
| * Camera Device 1 - resource_cost = 51 |
| * conflicting_devices = null |
| * |
| * Result: |
| * |
| * Since the sum of the resource costs is > 100, if a higher-priority |
| * application has either device open, no lower-priority applications will be |
| * allowed by the camera service to open either device. If a lower-priority |
| * application is using a device that a higher-priority subsequently attempts |
| * to open, the lower-priority application will be forced to disconnect the |
| * the device. |
| * |
| * If the highest-priority application chooses, it may still attempt to open |
| * both devices (since these devices are not listed as conflicting in the |
| * conflicting_devices fields), but usage of these devices may fail in the |
| * open or configure calls. |
| * |
| * Ex. 2: Camera Device 0 = Left Back Camera |
| * Camera Device 1 = Right Back Camera |
| * Camera Device 2 = Combined stereo camera using both right and left |
| * back camera sensors used by devices 0, and 1 |
| * Camera Device 3 = Front Camera |
| * - Due to do hardware constraints, up to two cameras may be open at once. The |
| * combined stereo camera may never be used at the same time as either of the |
| * two back camera devices (device 0, 1), and typically requires too much |
| * bandwidth to use at the same time as the front camera (device 3). |
| * |
| * Configuration: |
| * |
| * Camera Device 0 - resource_cost = 50 |
| * conflicting_devices = { 2 } |
| * Camera Device 1 - resource_cost = 50 |
| * conflicting_devices = { 2 } |
| * Camera Device 2 - resource_cost = 100 |
| * conflicting_devices = { 0, 1 } |
| * Camera Device 3 - resource_cost = 50 |
| * conflicting_devices = null |
| * |
| * Result: |
| * |
| * Based on the conflicting_devices fields, the camera service guarantees that |
| * the following sets of open devices will never be allowed: { 1, 2 }, { 0, 2 }. |
| * |
| * Based on the resource_cost fields, if a high-priority foreground application |
| * is using camera device 0, a background application would be allowed to open |
| * camera device 1 or 3 (but would be forced to disconnect it again if the |
| * foreground application opened another device). |
| * |
| * The highest priority application may still attempt to simultaneously open |
| * devices 0, 2, and 3, but the HAL may fail in open or configure calls for |
| * this combination. |
| * |
| * Ex. 3: Camera Device 0 = Back Camera |
| * Camera Device 1 = Front Camera |
| * Camera Device 2 = Low-power Front Camera that uses the same |
| * sensor as device 1, but only exposes image stream |
| * resolutions that can be used in low-power mode |
| * - Using both front cameras (device 1, 2) at the same time is impossible due |
| * a shared physical sensor. Using the back and "high-power" front camera |
| * (device 1) may be impossible for some stream configurations due to hardware |
| * limitations, but the "low-power" front camera option may always be used as |
| * it has special dedicated hardware. |
| * |
| * Configuration: |
| * |
| * Camera Device 0 - resource_cost = 100 |
| * conflicting_devices = null |
| * Camera Device 1 - resource_cost = 100 |
| * conflicting_devices = { 2 } |
| * Camera Device 2 - resource_cost = 0 |
| * conflicting_devices = { 1 } |
| * Result: |
| * |
| * Based on the conflicting_devices fields, the camera service guarantees that |
| * the following sets of open devices will never be allowed: { 1, 2 }. |
| * |
| * Based on the resource_cost fields, only the highest priority application |
| * may attempt to open both device 0 and 1 at the same time. If a higher-priority |
| * application is not using device 1 or 2, a low-priority background application |
| * may open device 2 (but will be forced to disconnect it if a higher-priority |
| * application subsequently opens device 1 or 2). |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * Not valid. Can be assumed to be 100. Do not read this field. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4 or higher: |
| * |
| * Always valid. |
| */ |
| int resource_cost; |
| |
| /** |
| * An array of camera device IDs represented as NULL-terminated strings |
| * indicating other devices that cannot be simultaneously opened while this |
| * camera device is in use. |
| * |
| * This field is intended to be used to indicate that this camera device |
| * is a composite of several other camera devices, or otherwise has |
| * hardware dependencies that prohibit simultaneous usage. If there are no |
| * dependencies, a NULL may be returned in this field to indicate this. |
| * |
| * The camera service will never simultaneously open any of the devices |
| * in this list while this camera device is open. |
| * |
| * The strings pointed to in this field will not be cleaned up by the camera |
| * service, and must remain while this device is plugged in. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * Not valid. Can be assumed to be NULL. Do not read this field. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4 or higher: |
| * |
| * Always valid. |
| */ |
| char** conflicting_devices; |
| |
| /** |
| * The length of the array given in the conflicting_devices field. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * Not valid. Can be assumed to be 0. Do not read this field. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4 or higher: |
| * |
| * Always valid. |
| */ |
| size_t conflicting_devices_length; |
| |
| } camera_info_t; |
| |
| /** |
| * camera_device_status_t: |
| * |
| * The current status of the camera device, as provided by the HAL through the |
| * camera_module_callbacks.camera_device_status_change() call. |
| * |
| * At module load time, the framework will assume all camera devices are in the |
| * CAMERA_DEVICE_STATUS_PRESENT state. The HAL should invoke |
| * camera_module_callbacks::camera_device_status_change to inform the framework |
| * of any initially NOT_PRESENT devices. |
| * |
| * Allowed transitions: |
| * PRESENT -> NOT_PRESENT |
| * NOT_PRESENT -> ENUMERATING |
| * NOT_PRESENT -> PRESENT |
| * ENUMERATING -> PRESENT |
| * ENUMERATING -> NOT_PRESENT |
| */ |
| typedef enum camera_device_status { |
| /** |
| * The camera device is not currently connected, and opening it will return |
| * failure. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * Calls to get_camera_info must still succeed, and provide the same information |
| * it would if the camera were connected. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4: |
| * |
| * The camera device at this status must return -EINVAL for get_camera_info call, |
| * as the device is not connected. |
| */ |
| CAMERA_DEVICE_STATUS_NOT_PRESENT = 0, |
| |
| /** |
| * The camera device is connected, and opening it will succeed. |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * The information returned by get_camera_info cannot change due to this status |
| * change. By default, the framework will assume all devices are in this state. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4: |
| * |
| * The information returned by get_camera_info will become valid after a device's |
| * status changes to this. By default, the framework will assume all devices are in |
| * this state. |
| */ |
| CAMERA_DEVICE_STATUS_PRESENT = 1, |
| |
| /** |
| * The camera device is connected, but it is undergoing an enumeration and |
| * so opening the device will return -EBUSY. |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * Calls to get_camera_info must still succeed, as if the camera was in the |
| * PRESENT status. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4: |
| * |
| * The camera device at this status must return -EINVAL for get_camera_info for call, |
| * as the device is not ready. |
| */ |
| CAMERA_DEVICE_STATUS_ENUMERATING = 2, |
| |
| } camera_device_status_t; |
| |
| /** |
| * torch_mode_status_t: |
| * |
| * The current status of the torch mode, as provided by the HAL through the |
| * camera_module_callbacks.torch_mode_status_change() call. |
| * |
| * The torch mode status of a camera device is applicable only when the camera |
| * device is present. The framework will not call set_torch_mode() to turn on |
| * torch mode of a camera device if the camera device is not present. At module |
| * load time, the framework will assume torch modes are in the |
| * TORCH_MODE_STATUS_AVAILABLE_OFF state if the camera device is present and |
| * android.flash.info.available is reported as true via get_camera_info() call. |
| * |
| * The behaviors of the camera HAL module that the framework expects in the |
| * following situations when a camera device's status changes: |
| * 1. A previously-disconnected camera device becomes connected. |
| * After camera_module_callbacks::camera_device_status_change() is invoked |
| * to inform the framework that the camera device is present, the framework |
| * will assume the camera device's torch mode is in |
| * TORCH_MODE_STATUS_AVAILABLE_OFF state. The camera HAL module does not need |
| * to invoke camera_module_callbacks::torch_mode_status_change() unless the |
| * flash unit is unavailable to use by set_torch_mode(). |
| * |
| * 2. A previously-connected camera becomes disconnected. |
| * After camera_module_callbacks::camera_device_status_change() is invoked |
| * to inform the framework that the camera device is not present, the |
| * framework will not call set_torch_mode() for the disconnected camera |
| * device until its flash unit becomes available again. The camera HAL |
| * module does not need to invoke |
| * camera_module_callbacks::torch_mode_status_change() separately to inform |
| * that the flash unit has become unavailable. |
| * |
| * 3. open() is called to open a camera device. |
| * The camera HAL module must invoke |
| * camera_module_callbacks::torch_mode_status_change() for all flash units |
| * that have entered TORCH_MODE_STATUS_NOT_AVAILABLE state and can not be |
| * turned on by calling set_torch_mode() anymore due to this open() call. |
| * open() must not trigger TORCH_MODE_STATUS_AVAILABLE_OFF before |
| * TORCH_MODE_STATUS_NOT_AVAILABLE for all flash units that have become |
| * unavailable. |
| * |
| * 4. close() is called to close a camera device. |
| * The camera HAL module must invoke |
| * camera_module_callbacks::torch_mode_status_change() for all flash units |
| * that have entered TORCH_MODE_STATUS_AVAILABLE_OFF state and can be turned |
| * on by calling set_torch_mode() again because of enough resources freed |
| * up by this close() call. |
| * |
| * Note that the framework calling set_torch_mode() successfully must trigger |
| * TORCH_MODE_STATUS_AVAILABLE_OFF or TORCH_MODE_STATUS_AVAILABLE_ON callback |
| * for the given camera device. Additionally it must trigger |
| * TORCH_MODE_STATUS_AVAILABLE_OFF callbacks for other previously-on torch |
| * modes if HAL cannot keep multiple torch modes on simultaneously. |
| */ |
| typedef enum torch_mode_status { |
| |
| /** |
| * The flash unit is no longer available and the torch mode can not be |
| * turned on by calling set_torch_mode(). If the torch mode is on, it |
| * will be turned off by HAL before HAL calls torch_mode_status_change(). |
| */ |
| TORCH_MODE_STATUS_NOT_AVAILABLE = 0, |
| |
| /** |
| * A torch mode has become off and available to be turned on via |
| * set_torch_mode(). This may happen in the following |
| * cases: |
| * 1. After the resources to turn on the torch mode have become available. |
| * 2. After set_torch_mode() is called to turn off the torch mode. |
| * 3. After the framework turned on the torch mode of some other camera |
| * device and HAL had to turn off the torch modes of any camera devices |
| * that were previously on. |
| */ |
| TORCH_MODE_STATUS_AVAILABLE_OFF = 1, |
| |
| /** |
| * A torch mode has become on and available to be turned off via |
| * set_torch_mode(). This can happen only after set_torch_mode() is called |
| * to turn on the torch mode. |
| */ |
| TORCH_MODE_STATUS_AVAILABLE_ON = 2, |
| |
| } torch_mode_status_t; |
| |
| /** |
| * Callback functions for the camera HAL module to use to inform the framework |
| * of changes to the camera subsystem. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * Each callback is called only by HAL modules implementing the indicated |
| * version or higher of the HAL module API interface. |
| * |
| * CAMERA_MODULE_API_VERSION_2_1: |
| * camera_device_status_change() |
| * |
| * CAMERA_MODULE_API_VERSION_2_4: |
| * torch_mode_status_change() |
| |
| */ |
| typedef struct camera_module_callbacks { |
| |
| /** |
| * camera_device_status_change: |
| * |
| * Callback to the framework to indicate that the state of a specific camera |
| * device has changed. At module load time, the framework will assume all |
| * camera devices are in the CAMERA_DEVICE_STATUS_PRESENT state. The HAL |
| * must call this method to inform the framework of any initially |
| * NOT_PRESENT devices. |
| * |
| * This callback is added for CAMERA_MODULE_API_VERSION_2_1. |
| * |
| * camera_module_callbacks: The instance of camera_module_callbacks_t passed |
| * to the module with set_callbacks. |
| * |
| * camera_id: The ID of the camera device that has a new status. |
| * |
| * new_status: The new status code, one of the camera_device_status_t enums, |
| * or a platform-specific status. |
| * |
| */ |
| void (*camera_device_status_change)(const struct camera_module_callbacks*, |
| int camera_id, |
| int new_status); |
| |
| /** |
| * torch_mode_status_change: |
| * |
| * Callback to the framework to indicate that the state of the torch mode |
| * of the flash unit associated with a specific camera device has changed. |
| * At module load time, the framework will assume the torch modes are in |
| * the TORCH_MODE_STATUS_AVAILABLE_OFF state if android.flash.info.available |
| * is reported as true via get_camera_info() call. |
| * |
| * This callback is added for CAMERA_MODULE_API_VERSION_2_4. |
| * |
| * camera_module_callbacks: The instance of camera_module_callbacks_t |
| * passed to the module with set_callbacks. |
| * |
| * camera_id: The ID of camera device whose flash unit has a new torch mode |
| * status. |
| * |
| * new_status: The new status code, one of the torch_mode_status_t enums. |
| */ |
| void (*torch_mode_status_change)(const struct camera_module_callbacks*, |
| const char* camera_id, |
| int new_status); |
| |
| |
| } camera_module_callbacks_t; |
| |
| typedef struct camera_module { |
| /** |
| * Common methods of the camera module. This *must* be the first member of |
| * camera_module as users of this structure will cast a hw_module_t to |
| * camera_module pointer in contexts where it's known the hw_module_t |
| * references a camera_module. |
| * |
| * The return values for common.methods->open for camera_module are: |
| * |
| * 0: On a successful open of the camera device. |
| * |
| * -ENODEV: The camera device cannot be opened due to an internal |
| * error. |
| * |
| * -EINVAL: The input arguments are invalid, i.e. the id is invalid, |
| * and/or the module is invalid. |
| * |
| * -EBUSY: The camera device was already opened for this camera id |
| * (by using this method or open_legacy), |
| * regardless of the device HAL version it was opened as. |
| * |
| * -EUSERS: The maximal number of camera devices that can be |
| * opened concurrently were opened already, either by |
| * this method or the open_legacy method. |
| * |
| * All other return values from common.methods->open will be treated as |
| * -ENODEV. |
| */ |
| hw_module_t common; |
| |
| /** |
| * get_number_of_cameras: |
| * |
| * Returns the number of camera devices accessible through the camera |
| * module. The camera devices are numbered 0 through N-1, where N is the |
| * value returned by this call. The name of the camera device for open() is |
| * simply the number converted to a string. That is, "0" for camera ID 0, |
| * "1" for camera ID 1. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_2_3 or lower: |
| * |
| * The value here must be static, and cannot change after the first call |
| * to this method. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4 or higher: |
| * |
| * The value here must be static, and must count only built-in cameras, |
| * which have CAMERA_FACING_BACK or CAMERA_FACING_FRONT camera facing values |
| * (camera_info.facing). The HAL must not include the external cameras |
| * (camera_info.facing == CAMERA_FACING_EXTERNAL) into the return value |
| * of this call. Frameworks will use camera_device_status_change callback |
| * to manage number of external cameras. |
| */ |
| int (*get_number_of_cameras)(void); |
| |
| /** |
| * get_camera_info: |
| * |
| * Return the static camera information for a given camera device. This |
| * information may not change for a camera device. |
| * |
| * Return values: |
| * |
| * 0: On a successful operation |
| * |
| * -ENODEV: The information cannot be provided due to an internal |
| * error. |
| * |
| * -EINVAL: The input arguments are invalid, i.e. the id is invalid, |
| * and/or the module is invalid. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_2_4 or higher: |
| * |
| * When a camera is disconnected, its camera id becomes invalid. Calling this |
| * this method with this invalid camera id will get -EINVAL and NULL camera |
| * static metadata (camera_info.static_camera_characteristics). |
| */ |
| int (*get_camera_info)(int camera_id, struct camera_info *info); |
| |
| /** |
| * set_callbacks: |
| * |
| * Provide callback function pointers to the HAL module to inform framework |
| * of asynchronous camera module events. The framework will call this |
| * function once after initial camera HAL module load, after the |
| * get_number_of_cameras() method is called for the first time, and before |
| * any other calls to the module. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_1_0, CAMERA_MODULE_API_VERSION_2_0: |
| * |
| * Not provided by HAL module. Framework may not call this function. |
| * |
| * CAMERA_MODULE_API_VERSION_2_1: |
| * |
| * Valid to be called by the framework. |
| * |
| * Return values: |
| * |
| * 0: On a successful operation |
| * |
| * -ENODEV: The operation cannot be completed due to an internal |
| * error. |
| * |
| * -EINVAL: The input arguments are invalid, i.e. the callbacks are |
| * null |
| */ |
| int (*set_callbacks)(const camera_module_callbacks_t *callbacks); |
| |
| /** |
| * get_vendor_tag_ops: |
| * |
| * Get methods to query for vendor extension metadata tag information. The |
| * HAL should fill in all the vendor tag operation methods, or leave ops |
| * unchanged if no vendor tags are defined. |
| * |
| * The vendor_tag_ops structure used here is defined in: |
| * system/media/camera/include/system/vendor_tags.h |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_1_x/2_0/2_1: |
| * Not provided by HAL module. Framework may not call this function. |
| * |
| * CAMERA_MODULE_API_VERSION_2_2: |
| * Valid to be called by the framework. |
| */ |
| void (*get_vendor_tag_ops)(vendor_tag_ops_t* ops); |
| |
| /** |
| * open_legacy: |
| * |
| * Open a specific legacy camera HAL device if multiple device HAL API |
| * versions are supported by this camera HAL module. For example, if the |
| * camera module supports both CAMERA_DEVICE_API_VERSION_1_0 and |
| * CAMERA_DEVICE_API_VERSION_3_2 device API for the same camera id, |
| * framework can call this function to open the camera device as |
| * CAMERA_DEVICE_API_VERSION_1_0 device. |
| * |
| * This is an optional method. A Camera HAL module does not need to support |
| * more than one device HAL version per device, and such modules may return |
| * -ENOSYS for all calls to this method. For all older HAL device API |
| * versions that are not supported, it may return -EOPNOTSUPP. When above |
| * cases occur, The normal open() method (common.methods->open) will be |
| * used by the framework instead. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_1_x/2_0/2_1/2_2: |
| * Not provided by HAL module. Framework will not call this function. |
| * |
| * CAMERA_MODULE_API_VERSION_2_3: |
| * Valid to be called by the framework. |
| * |
| * Return values: |
| * |
| * 0: On a successful open of the camera device. |
| * |
| * -ENOSYS This method is not supported. |
| * |
| * -EOPNOTSUPP: The requested HAL version is not supported by this method. |
| * |
| * -EINVAL: The input arguments are invalid, i.e. the id is invalid, |
| * and/or the module is invalid. |
| * |
| * -EBUSY: The camera device was already opened for this camera id |
| * (by using this method or common.methods->open method), |
| * regardless of the device HAL version it was opened as. |
| * |
| * -EUSERS: The maximal number of camera devices that can be |
| * opened concurrently were opened already, either by |
| * this method or common.methods->open method. |
| */ |
| int (*open_legacy)(const struct hw_module_t* module, const char* id, |
| uint32_t halVersion, struct hw_device_t** device); |
| |
| /** |
| * set_torch_mode: |
| * |
| * Turn on or off the torch mode of the flash unit associated with a given |
| * camera ID. If the operation is successful, HAL must notify the framework |
| * torch state by invoking |
| * camera_module_callbacks.torch_mode_status_change() with the new state. |
| * |
| * The camera device has a higher priority accessing the flash unit. When |
| * there are any resource conflicts, such as open() is called to open a |
| * camera device, HAL module must notify the framework through |
| * camera_module_callbacks.torch_mode_status_change() that the |
| * torch mode has been turned off and the torch mode state has become |
| * TORCH_MODE_STATUS_NOT_AVAILABLE. When resources to turn on torch mode |
| * become available again, HAL module must notify the framework through |
| * camera_module_callbacks.torch_mode_status_change() that the torch mode |
| * state has become TORCH_MODE_STATUS_AVAILABLE_OFF for set_torch_mode() to |
| * be called. |
| * |
| * When the framework calls set_torch_mode() to turn on the torch mode of a |
| * flash unit, if HAL cannot keep multiple torch modes on simultaneously, |
| * HAL should turn off the torch mode that was turned on by |
| * a previous set_torch_mode() call and notify the framework that the torch |
| * mode state of that flash unit has become TORCH_MODE_STATUS_AVAILABLE_OFF. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_1_x/2_0/2_1/2_2/2_3: |
| * Not provided by HAL module. Framework will not call this function. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4: |
| * Valid to be called by the framework. |
| * |
| * Return values: |
| * |
| * 0: On a successful operation. |
| * |
| * -ENOSYS: The camera device does not support this operation. It is |
| * returned if and only if android.flash.info.available is |
| * false. |
| * |
| * -EBUSY: The camera device is already in use. |
| * |
| * -EUSERS: The resources needed to turn on the torch mode are not |
| * available, typically because other camera devices are |
| * holding the resources to make using the flash unit not |
| * possible. |
| * |
| * -EINVAL: camera_id is invalid. |
| * |
| */ |
| int (*set_torch_mode)(const char* camera_id, bool enabled); |
| |
| /** |
| * init: |
| * |
| * This method is called by the camera service before any other methods |
| * are invoked, right after the camera HAL library has been successfully |
| * loaded. It may be left as NULL by the HAL module, if no initialization |
| * in needed. |
| * |
| * It can be used by HAL implementations to perform initialization and |
| * other one-time operations. |
| * |
| * Version information (based on camera_module_t.common.module_api_version): |
| * |
| * CAMERA_MODULE_API_VERSION_1_x/2_0/2_1/2_2/2_3: |
| * Not provided by HAL module. Framework will not call this function. |
| * |
| * CAMERA_MODULE_API_VERSION_2_4: |
| * If not NULL, will always be called by the framework once after the HAL |
| * module is loaded, before any other HAL module method is called. |
| * |
| * Return values: |
| * |
| * 0: On a successful operation. |
| * |
| * -ENODEV: Initialization cannot be completed due to an internal |
| * error. The HAL must be assumed to be in a nonfunctional |
| * state. |
| * |
| */ |
| int (*init)(); |
| |
| /* reserved for future use */ |
| void* reserved[5]; |
| } camera_module_t; |
| |
| __END_DECLS |
| |
| #endif /* ANDROID_INCLUDE_CAMERA_COMMON_H */ |
