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Diffstat (limited to 'include_all/hardware/camera2.h')
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diff --git a/include_all/hardware/camera2.h b/include_all/hardware/camera2.h new file mode 100644 index 00000000..547a1d78 --- /dev/null +++ b/include_all/hardware/camera2.h @@ -0,0 +1,842 @@ +/* + * 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. + */ + +#ifndef ANDROID_INCLUDE_CAMERA2_H +#define ANDROID_INCLUDE_CAMERA2_H + +#include "camera_common.h" +#include "system/camera_metadata.h" + +/** + * Camera device HAL 2.1 [ CAMERA_DEVICE_API_VERSION_2_0, CAMERA_DEVICE_API_VERSION_2_1 ] + * + * NO LONGER SUPPORTED. The camera service will no longer load HAL modules that + * contain HAL v2.0 or v2.1 devices. + * + * New devices should use Camera HAL v3.2 or newer. + * + * Supports the android.hardware.Camera API, and the android.hardware.camera2 + * API in legacy mode only. + * + * Camera devices that support this version of the HAL must return + * CAMERA_DEVICE_API_VERSION_2_1 in camera_device_t.common.version and in + * camera_info_t.device_version (from camera_module_t.get_camera_info). + * + * Camera modules that may contain version 2.x devices must implement at least + * version 2.0 of the camera module interface (as defined by + * camera_module_t.common.module_api_version). + * + * See camera_common.h for more versioning details. + * + * Version history: + * + * 2.0: CAMERA_DEVICE_API_VERSION_2_0. Initial release (Android 4.2): + * - Sufficient for implementing existing android.hardware.Camera API. + * - Allows for ZSL queue in camera service layer + * - Not tested for any new features such manual capture control, + * Bayer RAW capture, reprocessing of RAW data. + * + * 2.1: CAMERA_DEVICE_API_VERSION_2_1. Support per-device static metadata: + * - Add get_instance_metadata() method to retrieve metadata that is fixed + * after device open, but may be variable between open() calls. + */ + +__BEGIN_DECLS + +struct camera2_device; + +/********************************************************************** + * + * Input/output stream buffer queue interface definitions + * + */ + +/** + * Output image stream queue interface. A set of these methods is provided to + * the HAL device in allocate_stream(), and are used to interact with the + * gralloc buffer queue for that stream. They may not be called until after + * allocate_stream returns. + */ +typedef struct camera2_stream_ops { + /** + * Get a buffer to fill from the queue. The size and format of the buffer + * are fixed for a given stream (defined in allocate_stream), and the stride + * should be queried from the platform gralloc module. The gralloc buffer + * will have been allocated based on the usage flags provided by + * allocate_stream, and will be locked for use. + */ + int (*dequeue_buffer)(const struct camera2_stream_ops* w, + buffer_handle_t** buffer); + + /** + * Push a filled buffer to the stream to be used by the consumer. + * + * The timestamp represents the time at start of exposure of the first row + * of the image; it must be from a monotonic clock, and is measured in + * nanoseconds. The timestamps do not need to be comparable between + * different cameras, or consecutive instances of the same camera. However, + * they must be comparable between streams from the same camera. If one + * capture produces buffers for multiple streams, each stream must have the + * same timestamp for that buffer, and that timestamp must match the + * timestamp in the output frame metadata. + */ + int (*enqueue_buffer)(const struct camera2_stream_ops* w, + int64_t timestamp, + buffer_handle_t* buffer); + /** + * Return a buffer to the queue without marking it as filled. + */ + int (*cancel_buffer)(const struct camera2_stream_ops* w, + buffer_handle_t* buffer); + /** + * Set the crop window for subsequently enqueued buffers. The parameters are + * measured in pixels relative to the buffer width and height. + */ + int (*set_crop)(const struct camera2_stream_ops *w, + int left, int top, int right, int bottom); + +} camera2_stream_ops_t; + +/** + * Temporary definition during transition. + * + * These formats will be removed and replaced with + * HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED. To maximize forward compatibility, + * HAL implementations are strongly recommended to treat FORMAT_OPAQUE and + * FORMAT_ZSL as equivalent to HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED, and + * return HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED in the format_actual output + * parameter of allocate_stream, allowing the gralloc module to select the + * specific format based on the usage flags from the camera and the stream + * consumer. + */ +enum { + CAMERA2_HAL_PIXEL_FORMAT_OPAQUE = HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED, + CAMERA2_HAL_PIXEL_FORMAT_ZSL = -1 +}; + +/** + * Transport header for compressed JPEG buffers in output streams. + * + * To capture JPEG images, a stream is created using the pixel format + * HAL_PIXEL_FORMAT_BLOB, and the static metadata field android.jpeg.maxSize is + * used as the buffer size. Since compressed JPEG images are of variable size, + * the HAL needs to include the final size of the compressed image using this + * structure inside the output stream buffer. The JPEG blob ID field must be set + * to CAMERA2_JPEG_BLOB_ID. + * + * Transport header should be at the end of the JPEG output stream buffer. That + * means the jpeg_blob_id must start at byte[android.jpeg.maxSize - + * sizeof(camera2_jpeg_blob)]. Any HAL using this transport header must + * account for it in android.jpeg.maxSize. The JPEG data itself starts at + * byte[0] and should be jpeg_size bytes long. + */ +typedef struct camera2_jpeg_blob { + uint16_t jpeg_blob_id; + uint32_t jpeg_size; +} camera2_jpeg_blob_t; + +enum { + CAMERA2_JPEG_BLOB_ID = 0x00FF +}; + +/** + * Input reprocess stream queue management. A set of these methods is provided + * to the HAL device in allocate_reprocess_stream(); they are used to interact + * with the reprocess stream's input gralloc buffer queue. + */ +typedef struct camera2_stream_in_ops { + /** + * Get the next buffer of image data to reprocess. The width, height, and + * format of the buffer is fixed in allocate_reprocess_stream(), and the + * stride and other details should be queried from the platform gralloc + * module as needed. The buffer will already be locked for use. + */ + int (*acquire_buffer)(const struct camera2_stream_in_ops *w, + buffer_handle_t** buffer); + /** + * Return a used buffer to the buffer queue for reuse. + */ + int (*release_buffer)(const struct camera2_stream_in_ops *w, + buffer_handle_t* buffer); + +} camera2_stream_in_ops_t; + +/********************************************************************** + * + * Metadata queue management, used for requests sent to HAL module, and for + * frames produced by the HAL. + * + */ + +enum { + CAMERA2_REQUEST_QUEUE_IS_BOTTOMLESS = -1 +}; + +/** + * Request input queue protocol: + * + * The framework holds the queue and its contents. At start, the queue is empty. + * + * 1. When the first metadata buffer is placed into the queue, the framework + * signals the device by calling notify_request_queue_not_empty(). + * + * 2. After receiving notify_request_queue_not_empty, the device must call + * dequeue() once it's ready to handle the next buffer. + * + * 3. Once the device has processed a buffer, and is ready for the next buffer, + * it must call dequeue() again instead of waiting for a notification. If + * there are no more buffers available, dequeue() will return NULL. After + * this point, when a buffer becomes available, the framework must call + * notify_request_queue_not_empty() again. If the device receives a NULL + * return from dequeue, it does not need to query the queue again until a + * notify_request_queue_not_empty() call is received from the source. + * + * 4. If the device calls buffer_count() and receives 0, this does not mean that + * the framework will provide a notify_request_queue_not_empty() call. The + * framework will only provide such a notification after the device has + * received a NULL from dequeue, or on initial startup. + * + * 5. The dequeue() call in response to notify_request_queue_not_empty() may be + * on the same thread as the notify_request_queue_not_empty() call, and may + * be performed from within the notify call. + * + * 6. All dequeued request buffers must be returned to the framework by calling + * free_request, including when errors occur, a device flush is requested, or + * when the device is shutting down. + */ +typedef struct camera2_request_queue_src_ops { + /** + * Get the count of request buffers pending in the queue. May return + * CAMERA2_REQUEST_QUEUE_IS_BOTTOMLESS if a repeating request (stream + * request) is currently configured. Calling this method has no effect on + * whether the notify_request_queue_not_empty() method will be called by the + * framework. + */ + int (*request_count)(const struct camera2_request_queue_src_ops *q); + + /** + * Get a metadata buffer from the framework. Returns OK if there is no + * error. If the queue is empty, returns NULL in buffer. In that case, the + * device must wait for a notify_request_queue_not_empty() message before + * attempting to dequeue again. Buffers obtained in this way must be + * returned to the framework with free_request(). + */ + int (*dequeue_request)(const struct camera2_request_queue_src_ops *q, + camera_metadata_t **buffer); + /** + * Return a metadata buffer to the framework once it has been used, or if + * an error or shutdown occurs. + */ + int (*free_request)(const struct camera2_request_queue_src_ops *q, + camera_metadata_t *old_buffer); + +} camera2_request_queue_src_ops_t; + +/** + * Frame output queue protocol: + * + * The framework holds the queue and its contents. At start, the queue is empty. + * + * 1. When the device is ready to fill an output metadata frame, it must dequeue + * a metadata buffer of the required size. + * + * 2. It should then fill the metadata buffer, and place it on the frame queue + * using enqueue_frame. The framework takes ownership of the frame. + * + * 3. In case of an error, a request to flush the pipeline, or shutdown, the + * device must return any affected dequeued frames to the framework by + * calling cancel_frame. + */ +typedef struct camera2_frame_queue_dst_ops { + /** + * Get an empty metadata buffer to fill from the framework. The new metadata + * buffer will have room for entries number of metadata entries, plus + * data_bytes worth of extra storage. Frames dequeued here must be returned + * to the framework with either cancel_frame or enqueue_frame. + */ + int (*dequeue_frame)(const struct camera2_frame_queue_dst_ops *q, + size_t entries, size_t data_bytes, + camera_metadata_t **buffer); + + /** + * Return a dequeued metadata buffer to the framework for reuse; do not mark it as + * filled. Use when encountering errors, or flushing the internal request queue. + */ + int (*cancel_frame)(const struct camera2_frame_queue_dst_ops *q, + camera_metadata_t *buffer); + + /** + * Place a completed metadata frame on the frame output queue. + */ + int (*enqueue_frame)(const struct camera2_frame_queue_dst_ops *q, + camera_metadata_t *buffer); + +} camera2_frame_queue_dst_ops_t; + +/********************************************************************** + * + * Notification callback and message definition, and trigger definitions + * + */ + +/** + * Asynchronous notification callback from the HAL, fired for various + * reasons. Only for information independent of frame capture, or that require + * specific timing. The user pointer must be the same one that was passed to the + * device in set_notify_callback(). + */ +typedef void (*camera2_notify_callback)(int32_t msg_type, + int32_t ext1, + int32_t ext2, + int32_t ext3, + void *user); + +/** + * Possible message types for camera2_notify_callback + */ +enum { + /** + * An error has occurred. Argument ext1 contains the error code, and + * ext2 and ext3 contain any error-specific information. + */ + CAMERA2_MSG_ERROR = 0x0001, + /** + * The exposure of a given request has begun. Argument ext1 contains the + * frame number, and ext2 and ext3 contain the low-order and high-order + * bytes of the timestamp for when exposure began. + * (timestamp = (ext3 << 32 | ext2)) + */ + CAMERA2_MSG_SHUTTER = 0x0010, + /** + * The autofocus routine has changed state. Argument ext1 contains the new + * state; the values are the same as those for the metadata field + * android.control.afState. Ext2 contains the latest trigger ID passed to + * trigger_action(CAMERA2_TRIGGER_AUTOFOCUS) or + * trigger_action(CAMERA2_TRIGGER_CANCEL_AUTOFOCUS), or 0 if trigger has not + * been called with either of those actions. + */ + CAMERA2_MSG_AUTOFOCUS = 0x0020, + /** + * The autoexposure routine has changed state. Argument ext1 contains the + * new state; the values are the same as those for the metadata field + * android.control.aeState. Ext2 contains the latest trigger ID value passed to + * trigger_action(CAMERA2_TRIGGER_PRECAPTURE_METERING), or 0 if that method + * has not been called. + */ + CAMERA2_MSG_AUTOEXPOSURE = 0x0021, + /** + * The auto-whitebalance routine has changed state. Argument ext1 contains + * the new state; the values are the same as those for the metadata field + * android.control.awbState. Ext2 contains the latest trigger ID passed to + * trigger_action(CAMERA2_TRIGGER_PRECAPTURE_METERING), or 0 if that method + * has not been called. + */ + CAMERA2_MSG_AUTOWB = 0x0022 +}; + +/** + * Error codes for CAMERA_MSG_ERROR + */ +enum { + /** + * A serious failure occured. Camera device may not work without reboot, and + * no further frames or buffer streams will be produced by the + * device. Device should be treated as closed. + */ + CAMERA2_MSG_ERROR_HARDWARE = 0x0001, + /** + * A serious failure occured. No further frames or buffer streams will be + * produced by the device. Device should be treated as closed. The client + * must reopen the device to use it again. + */ + CAMERA2_MSG_ERROR_DEVICE, + /** + * An error has occurred in processing a request. No output (metadata or + * buffers) will be produced for this request. ext2 contains the frame + * number of the request. Subsequent requests are unaffected, and the device + * remains operational. + */ + CAMERA2_MSG_ERROR_REQUEST, + /** + * An error has occurred in producing an output frame metadata buffer for a + * request, but image buffers for it will still be available. Subsequent + * requests are unaffected, and the device remains operational. ext2 + * contains the frame number of the request. + */ + CAMERA2_MSG_ERROR_FRAME, + /** + * An error has occurred in placing an output buffer into a stream for a + * request. The frame metadata and other buffers may still be + * available. Subsequent requests are unaffected, and the device remains + * operational. ext2 contains the frame number of the request, and ext3 + * contains the stream id. + */ + CAMERA2_MSG_ERROR_STREAM, + /** + * Number of error types + */ + CAMERA2_MSG_NUM_ERRORS +}; + +/** + * Possible trigger ids for trigger_action() + */ +enum { + /** + * Trigger an autofocus cycle. The effect of the trigger depends on the + * autofocus mode in effect when the trigger is received, which is the mode + * listed in the latest capture request to be dequeued by the HAL. If the + * mode is OFF, EDOF, or FIXED, the trigger has no effect. In AUTO, MACRO, + * or CONTINUOUS_* modes, see below for the expected behavior. The state of + * the autofocus cycle can be tracked in android.control.afMode and the + * corresponding notifications. + * + ** + * In AUTO or MACRO mode, the AF state transitions (and notifications) + * when calling with trigger ID = N with the previous ID being K are: + * + * Initial state Transitions + * INACTIVE (K) -> ACTIVE_SCAN (N) -> AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * AF_FOCUSED (K) -> ACTIVE_SCAN (N) -> AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * AF_NOT_FOCUSED (K) -> ACTIVE_SCAN (N) -> AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * ACTIVE_SCAN (K) -> AF_FOCUSED(N) or AF_NOT_FOCUSED(N) + * PASSIVE_SCAN (K) Not used in AUTO/MACRO mode + * PASSIVE_FOCUSED (K) Not used in AUTO/MACRO mode + * + ** + * In CONTINUOUS_PICTURE mode, triggering AF must lock the AF to the current + * lens position and transition the AF state to either AF_FOCUSED or + * NOT_FOCUSED. If a passive scan is underway, that scan must complete and + * then lock the lens position and change AF state. TRIGGER_CANCEL_AUTOFOCUS + * will allow the AF to restart its operation. + * + * Initial state Transitions + * INACTIVE (K) -> immediate AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * PASSIVE_FOCUSED (K) -> immediate AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * PASSIVE_SCAN (K) -> AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * AF_FOCUSED (K) no effect except to change next notification ID to N + * AF_NOT_FOCUSED (K) no effect except to change next notification ID to N + * + ** + * In CONTINUOUS_VIDEO mode, triggering AF must lock the AF to the current + * lens position and transition the AF state to either AF_FOCUSED or + * NOT_FOCUSED. If a passive scan is underway, it must immediately halt, in + * contrast with CONTINUOUS_PICTURE mode. TRIGGER_CANCEL_AUTOFOCUS will + * allow the AF to restart its operation. + * + * Initial state Transitions + * INACTIVE (K) -> immediate AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * PASSIVE_FOCUSED (K) -> immediate AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * PASSIVE_SCAN (K) -> immediate AF_FOCUSED (N) or AF_NOT_FOCUSED (N) + * AF_FOCUSED (K) no effect except to change next notification ID to N + * AF_NOT_FOCUSED (K) no effect except to change next notification ID to N + * + * Ext1 is an ID that must be returned in subsequent auto-focus state change + * notifications through camera2_notify_callback() and stored in + * android.control.afTriggerId. + */ + CAMERA2_TRIGGER_AUTOFOCUS = 0x0001, + /** + * Send a cancel message to the autofocus algorithm. The effect of the + * cancellation depends on the autofocus mode in effect when the trigger is + * received, which is the mode listed in the latest capture request to be + * dequeued by the HAL. If the AF mode is OFF or EDOF, the cancel has no + * effect. For other modes, the lens should return to its default position, + * any current autofocus scan must be canceled, and the AF state should be + * set to INACTIVE. + * + * The state of the autofocus cycle can be tracked in android.control.afMode + * and the corresponding notification. Continuous autofocus modes may resume + * focusing operations thereafter exactly as if the camera had just been set + * to a continuous AF mode. + * + * Ext1 is an ID that must be returned in subsequent auto-focus state change + * notifications through camera2_notify_callback() and stored in + * android.control.afTriggerId. + */ + CAMERA2_TRIGGER_CANCEL_AUTOFOCUS, + /** + * Trigger a pre-capture metering cycle, which may include firing the flash + * to determine proper capture parameters. Typically, this trigger would be + * fired for a half-depress of a camera shutter key, or before a snapshot + * capture in general. The state of the metering cycle can be tracked in + * android.control.aeMode and the corresponding notification. If the + * auto-exposure mode is OFF, the trigger does nothing. + * + * Ext1 is an ID that must be returned in subsequent + * auto-exposure/auto-white balance state change notifications through + * camera2_notify_callback() and stored in android.control.aePrecaptureId. + */ + CAMERA2_TRIGGER_PRECAPTURE_METERING +}; + +/** + * Possible template types for construct_default_request() + */ +enum { + /** + * Standard camera preview operation with 3A on auto. + */ + CAMERA2_TEMPLATE_PREVIEW = 1, + /** + * Standard camera high-quality still capture with 3A and flash on auto. + */ + CAMERA2_TEMPLATE_STILL_CAPTURE, + /** + * Standard video recording plus preview with 3A on auto, torch off. + */ + CAMERA2_TEMPLATE_VIDEO_RECORD, + /** + * High-quality still capture while recording video. Application will + * include preview, video record, and full-resolution YUV or JPEG streams in + * request. Must not cause stuttering on video stream. 3A on auto. + */ + CAMERA2_TEMPLATE_VIDEO_SNAPSHOT, + /** + * Zero-shutter-lag mode. Application will request preview and + * full-resolution data for each frame, and reprocess it to JPEG when a + * still image is requested by user. Settings should provide highest-quality + * full-resolution images without compromising preview frame rate. 3A on + * auto. + */ + CAMERA2_TEMPLATE_ZERO_SHUTTER_LAG, + + /* Total number of templates */ + CAMERA2_TEMPLATE_COUNT +}; + + +/********************************************************************** + * + * Camera device operations + * + */ +typedef struct camera2_device_ops { + + /********************************************************************** + * Request and frame queue setup and management methods + */ + + /** + * Pass in input request queue interface methods. + */ + int (*set_request_queue_src_ops)(const struct camera2_device *, + const camera2_request_queue_src_ops_t *request_src_ops); + + /** + * Notify device that the request queue is no longer empty. Must only be + * called when the first buffer is added a new queue, or after the source + * has returned NULL in response to a dequeue call. + */ + int (*notify_request_queue_not_empty)(const struct camera2_device *); + + /** + * Pass in output frame queue interface methods + */ + int (*set_frame_queue_dst_ops)(const struct camera2_device *, + const camera2_frame_queue_dst_ops_t *frame_dst_ops); + + /** + * Number of camera requests being processed by the device at the moment + * (captures/reprocesses that have had their request dequeued, but have not + * yet been enqueued onto output pipeline(s) ). No streams may be released + * by the framework until the in-progress count is 0. + */ + int (*get_in_progress_count)(const struct camera2_device *); + + /** + * Flush all in-progress captures. This includes all dequeued requests + * (regular or reprocessing) that have not yet placed any outputs into a + * stream or the frame queue. Partially completed captures must be completed + * normally. No new requests may be dequeued from the request queue until + * the flush completes. + */ + int (*flush_captures_in_progress)(const struct camera2_device *); + + /** + * Create a filled-in default request for standard camera use cases. + * + * The device must return a complete request that is configured to meet the + * requested use case, which must be one of the CAMERA2_TEMPLATE_* + * enums. All request control fields must be included, except for + * android.request.outputStreams. + * + * The metadata buffer returned must be allocated with + * allocate_camera_metadata. The framework takes ownership of the buffer. + */ + int (*construct_default_request)(const struct camera2_device *, + int request_template, + camera_metadata_t **request); + + /********************************************************************** + * Stream management + */ + + /** + * allocate_stream: + * + * Allocate a new output stream for use, defined by the output buffer width, + * height, target, and possibly the pixel format. Returns the new stream's + * ID, gralloc usage flags, minimum queue buffer count, and possibly the + * pixel format, on success. Error conditions: + * + * - Requesting a width/height/format combination not listed as + * supported by the sensor's static characteristics + * + * - Asking for too many streams of a given format type (2 bayer raw + * streams, for example). + * + * Input parameters: + * + * - width, height, format: Specification for the buffers to be sent through + * this stream. Format is a value from the HAL_PIXEL_FORMAT_* list. If + * HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED is used, then the platform + * gralloc module will select a format based on the usage flags provided + * by the camera HAL and the consumer of the stream. The camera HAL should + * inspect the buffers handed to it in the register_stream_buffers call to + * obtain the implementation-specific format if necessary. + * + * - stream_ops: A structure of function pointers for obtaining and queuing + * up buffers for this stream. The underlying stream will be configured + * based on the usage and max_buffers outputs. The methods in this + * structure may not be called until after allocate_stream returns. + * + * Output parameters: + * + * - stream_id: An unsigned integer identifying this stream. This value is + * used in incoming requests to identify the stream, and in releasing the + * stream. + * + * - usage: The gralloc usage mask needed by the HAL device for producing + * the requested type of data. This is used in allocating new gralloc + * buffers for the stream buffer queue. + * + * - max_buffers: The maximum number of buffers the HAL device may need to + * have dequeued at the same time. The device may not dequeue more buffers + * than this value at the same time. + * + */ + int (*allocate_stream)( + const struct camera2_device *, + // inputs + uint32_t width, + uint32_t height, + int format, + const camera2_stream_ops_t *stream_ops, + // outputs + uint32_t *stream_id, + uint32_t *format_actual, // IGNORED, will be removed + uint32_t *usage, + uint32_t *max_buffers); + + /** + * Register buffers for a given stream. This is called after a successful + * allocate_stream call, and before the first request referencing the stream + * is enqueued. This method is intended to allow the HAL device to map or + * otherwise prepare the buffers for later use. num_buffers is guaranteed to + * be at least max_buffers (from allocate_stream), but may be larger. The + * buffers will already be locked for use. At the end of the call, all the + * buffers must be ready to be returned to the queue. If the stream format + * was set to HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED, the camera HAL should + * inspect the passed-in buffers here to determine any platform-private + * pixel format information. + */ + int (*register_stream_buffers)( + const struct camera2_device *, + uint32_t stream_id, + int num_buffers, + buffer_handle_t *buffers); + + /** + * Release a stream. Returns an error if called when get_in_progress_count + * is non-zero, or if the stream id is invalid. + */ + int (*release_stream)( + const struct camera2_device *, + uint32_t stream_id); + + /** + * allocate_reprocess_stream: + * + * Allocate a new input stream for use, defined by the output buffer width, + * height, and the pixel format. Returns the new stream's ID, gralloc usage + * flags, and required simultaneously acquirable buffer count, on + * success. Error conditions: + * + * - Requesting a width/height/format combination not listed as + * supported by the sensor's static characteristics + * + * - Asking for too many reprocessing streams to be configured at once. + * + * Input parameters: + * + * - width, height, format: Specification for the buffers to be sent through + * this stream. Format must be a value from the HAL_PIXEL_FORMAT_* list. + * + * - reprocess_stream_ops: A structure of function pointers for acquiring + * and releasing buffers for this stream. The underlying stream will be + * configured based on the usage and max_buffers outputs. + * + * Output parameters: + * + * - stream_id: An unsigned integer identifying this stream. This value is + * used in incoming requests to identify the stream, and in releasing the + * stream. These ids are numbered separately from the input stream ids. + * + * - consumer_usage: The gralloc usage mask needed by the HAL device for + * consuming the requested type of data. This is used in allocating new + * gralloc buffers for the stream buffer queue. + * + * - max_buffers: The maximum number of buffers the HAL device may need to + * have acquired at the same time. The device may not have more buffers + * acquired at the same time than this value. + * + */ + int (*allocate_reprocess_stream)(const struct camera2_device *, + uint32_t width, + uint32_t height, + uint32_t format, + const camera2_stream_in_ops_t *reprocess_stream_ops, + // outputs + uint32_t *stream_id, + uint32_t *consumer_usage, + uint32_t *max_buffers); + + /** + * allocate_reprocess_stream_from_stream: + * + * Allocate a new input stream for use, which will use the buffers allocated + * for an existing output stream. That is, after the HAL enqueues a buffer + * onto the output stream, it may see that same buffer handed to it from + * this input reprocessing stream. After the HAL releases the buffer back to + * the reprocessing stream, it will be returned to the output queue for + * reuse. + * + * Error conditions: + * + * - Using an output stream of unsuitable size/format for the basis of the + * reprocessing stream. + * + * - Attempting to allocatee too many reprocessing streams at once. + * + * Input parameters: + * + * - output_stream_id: The ID of an existing output stream which has + * a size and format suitable for reprocessing. + * + * - reprocess_stream_ops: A structure of function pointers for acquiring + * and releasing buffers for this stream. The underlying stream will use + * the same graphics buffer handles as the output stream uses. + * + * Output parameters: + * + * - stream_id: An unsigned integer identifying this stream. This value is + * used in incoming requests to identify the stream, and in releasing the + * stream. These ids are numbered separately from the input stream ids. + * + * The HAL client must always release the reprocessing stream before it + * releases the output stream it is based on. + * + */ + int (*allocate_reprocess_stream_from_stream)(const struct camera2_device *, + uint32_t output_stream_id, + const camera2_stream_in_ops_t *reprocess_stream_ops, + // outputs + uint32_t *stream_id); + + /** + * Release a reprocessing stream. Returns an error if called when + * get_in_progress_count is non-zero, or if the stream id is not + * valid. + */ + int (*release_reprocess_stream)( + const struct camera2_device *, + uint32_t stream_id); + + /********************************************************************** + * Miscellaneous methods + */ + + /** + * Trigger asynchronous activity. This is used for triggering special + * behaviors of the camera 3A routines when they are in use. See the + * documentation for CAMERA2_TRIGGER_* above for details of the trigger ids + * and their arguments. + */ + int (*trigger_action)(const struct camera2_device *, + uint32_t trigger_id, + int32_t ext1, + int32_t ext2); + + /** + * Notification callback setup + */ + int (*set_notify_callback)(const struct camera2_device *, + camera2_notify_callback notify_cb, + void *user); + + /** + * Get methods to query for vendor extension metadata tag infomation. May + * set ops to NULL if no vendor extension tags are defined. + */ + int (*get_metadata_vendor_tag_ops)(const struct camera2_device*, + vendor_tag_query_ops_t **ops); + + /** + * Dump state of the camera hardware + */ + int (*dump)(const struct camera2_device *, int fd); + + /** + * Get device-instance-specific metadata. This metadata must be constant for + * a single instance of the camera device, but may be different between + * open() calls. The returned camera_metadata pointer must be valid until + * the device close() method is called. + * + * Version information: + * + * CAMERA_DEVICE_API_VERSION_2_0: + * + * Not available. Framework may not access this function pointer. + * + * CAMERA_DEVICE_API_VERSION_2_1: + * + * Valid. Can be called by the framework. + * + */ + int (*get_instance_metadata)(const struct camera2_device *, + camera_metadata **instance_metadata); + +} camera2_device_ops_t; + +/********************************************************************** + * + * Camera device definition + * + */ +typedef struct camera2_device { + /** + * common.version must equal CAMERA_DEVICE_API_VERSION_2_0 to identify + * this device as implementing version 2.0 of the camera device HAL. + */ + hw_device_t common; + camera2_device_ops_t *ops; + void *priv; +} camera2_device_t; + +__END_DECLS + +#endif /* #ifdef ANDROID_INCLUDE_CAMERA2_H */ |