/* * Copyright (C) 2010-2011 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_CAMERA_H #define ANDROID_INCLUDE_CAMERA_H #include "camera_common.h" /** * Camera device HAL, initial version [ CAMERA_DEVICE_API_VERSION_1_0 ] * * Supports the android.hardware.Camera API. * * Camera devices that support this version of the HAL must return a value in * the range HARDWARE_DEVICE_API_VERSION(0,0)-(1,FF) in * camera_device_t.common.version. CAMERA_DEVICE_API_VERSION_1_0 is the * recommended value. * * Camera modules that implement version 2.0 or higher of camera_module_t must * also return the value of camera_device_t.common.version in * camera_info_t.device_version. * * See camera_common.h for more details. */ __BEGIN_DECLS struct camera_memory; typedef void (*camera_release_memory)(struct camera_memory *mem); typedef struct camera_memory { void *data; size_t size; void *handle; camera_release_memory release; } camera_memory_t; typedef camera_memory_t* (*camera_request_memory)(int fd, size_t buf_size, unsigned int num_bufs, void *user); typedef void (*camera_notify_callback)(int32_t msg_type, int32_t ext1, int32_t ext2, void *user); typedef void (*camera_data_callback)(int32_t msg_type, const camera_memory_t *data, unsigned int index, camera_frame_metadata_t *metadata, void *user); typedef void (*camera_data_timestamp_callback)(int64_t timestamp, int32_t msg_type, const camera_memory_t *data, unsigned int index, void *user); #define HAL_CAMERA_PREVIEW_WINDOW_TAG 0xcafed00d typedef struct preview_stream_ops { int (*dequeue_buffer)(struct preview_stream_ops* w, buffer_handle_t** buffer, int *stride); int (*enqueue_buffer)(struct preview_stream_ops* w, buffer_handle_t* buffer); int (*cancel_buffer)(struct preview_stream_ops* w, buffer_handle_t* buffer); int (*set_buffer_count)(struct preview_stream_ops* w, int count); int (*set_buffers_geometry)(struct preview_stream_ops* pw, int w, int h, int format); int (*set_crop)(struct preview_stream_ops *w, int left, int top, int right, int bottom); int (*set_usage)(struct preview_stream_ops* w, int usage); int (*set_swap_interval)(struct preview_stream_ops *w, int interval); int (*get_min_undequeued_buffer_count)(const struct preview_stream_ops *w, int *count); int (*lock_buffer)(struct preview_stream_ops* w, buffer_handle_t* buffer); // Timestamps are measured in nanoseconds, and must be comparable // and monotonically increasing between two frames in the same // preview stream. They do not need to be comparable between // consecutive or parallel preview streams, cameras, or app runs. int (*set_timestamp)(struct preview_stream_ops *w, int64_t timestamp); } preview_stream_ops_t; struct camera_device; typedef struct camera_device_ops { /** Set the ANativeWindow to which preview frames are sent */ int (*set_preview_window)(struct camera_device *, struct preview_stream_ops *window); /** Set the notification and data callbacks */ void (*set_callbacks)(struct camera_device *, camera_notify_callback notify_cb, camera_data_callback data_cb, camera_data_timestamp_callback data_cb_timestamp, camera_request_memory get_memory, void *user); /** * The following three functions all take a msg_type, which is a bitmask of * the messages defined in include/ui/Camera.h */ /** * Enable a message, or set of messages. */ void (*enable_msg_type)(struct camera_device *, int32_t msg_type); /** * Disable a message, or a set of messages. * * Once received a call to disableMsgType(CAMERA_MSG_VIDEO_FRAME), camera * HAL should not rely on its client to call releaseRecordingFrame() to * release video recording frames sent out by the cameral HAL before and * after the disableMsgType(CAMERA_MSG_VIDEO_FRAME) call. Camera HAL * clients must not modify/access any video recording frame after calling * disableMsgType(CAMERA_MSG_VIDEO_FRAME). */ void (*disable_msg_type)(struct camera_device *, int32_t msg_type); /** * Query whether a message, or a set of messages, is enabled. Note that * this is operates as an AND, if any of the messages queried are off, this * will return false. */ int (*msg_type_enabled)(struct camera_device *, int32_t msg_type); /** * Start preview mode. */ int (*start_preview)(struct camera_device *); /** * Stop a previously started preview. */ void (*stop_preview)(struct camera_device *); /** * Returns true if preview is enabled. */ int (*preview_enabled)(struct camera_device *); /** * Request the camera HAL to store meta data or real YUV data in the video * buffers sent out via CAMERA_MSG_VIDEO_FRAME for a recording session. If * it is not called, the default camera HAL behavior is to store real YUV * data in the video buffers. * * This method should be called before startRecording() in order to be * effective. * * If meta data is stored in the video buffers, it is up to the receiver of * the video buffers to interpret the contents and to find the actual frame * data with the help of the meta data in the buffer. How this is done is * outside of the scope of this method. * * Some camera HALs may not support storing meta data in the video buffers, * but all camera HALs should support storing real YUV data in the video * buffers. If the camera HAL does not support storing the meta data in the * video buffers when it is requested to do do, INVALID_OPERATION must be * returned. It is very useful for the camera HAL to pass meta data rather * than the actual frame data directly to the video encoder, since the * amount of the uncompressed frame data can be very large if video size is * large. * * @param enable if true to instruct the camera HAL to store * meta data in the video buffers; false to instruct * the camera HAL to store real YUV data in the video * buffers. * * @return OK on success. */ int (*store_meta_data_in_buffers)(struct camera_device *, int enable); /** * Start record mode. When a record image is available, a * CAMERA_MSG_VIDEO_FRAME message is sent with the corresponding * frame. Every record frame must be released by a camera HAL client via * releaseRecordingFrame() before the client calls * disableMsgType(CAMERA_MSG_VIDEO_FRAME). After the client calls * disableMsgType(CAMERA_MSG_VIDEO_FRAME), it is the camera HAL's * responsibility to manage the life-cycle of the video recording frames, * and the client must not modify/access any video recording frames. */ int (*start_recording)(struct camera_device *); /** * Stop a previously started recording. */ void (*stop_recording)(struct camera_device *); /** * Returns true if recording is enabled. */ int (*recording_enabled)(struct camera_device *); /** * Release a record frame previously returned by CAMERA_MSG_VIDEO_FRAME. * * It is camera HAL client's responsibility to release video recording * frames sent out by the camera HAL before the camera HAL receives a call * to disableMsgType(CAMERA_MSG_VIDEO_FRAME). After it receives the call to * disableMsgType(CAMERA_MSG_VIDEO_FRAME), it is the camera HAL's * responsibility to manage the life-cycle of the video recording frames. */ void (*release_recording_frame)(struct camera_device *, const void *opaque); /** * Start auto focus, the notification callback routine is called with * CAMERA_MSG_FOCUS once when focusing is complete. autoFocus() will be * called again if another auto focus is needed. */ int (*auto_focus)(struct camera_device *); /** * Cancels auto-focus function. If the auto-focus is still in progress, * this function will cancel it. Whether the auto-focus is in progress or * not, this function will return the focus position to the default. If * the camera does not support auto-focus, this is a no-op. */ int (*cancel_auto_focus)(struct camera_device *); /** * Take a picture. */ int (*take_picture)(struct camera_device *); /** * Cancel a picture that was started with takePicture. Calling this method * when no picture is being taken is a no-op. */ int (*cancel_picture)(struct camera_device *); /** * Set the camera parameters. This returns BAD_VALUE if any parameter is * invalid or not supported. */ int (*set_parameters)(struct camera_device *, const char *parms); /** Retrieve the camera parameters. The buffer returned by the camera HAL must be returned back to it with put_parameters, if put_parameters is not NULL. */ char *(*get_parameters)(struct camera_device *); /** The camera HAL uses its own memory to pass us the parameters when we call get_parameters. Use this function to return the memory back to the camera HAL, if put_parameters is not NULL. If put_parameters is NULL, then you have to use free() to release the memory. */ void (*put_parameters)(struct camera_device *, char *); /** * Send command to camera driver. */ int (*send_command)(struct camera_device *, int32_t cmd, int32_t arg1, int32_t arg2); /** * Release the hardware resources owned by this object. Note that this is * *not* done in the destructor. */ void (*release)(struct camera_device *); /** * Dump state of the camera hardware */ int (*dump)(struct camera_device *, int fd); } camera_device_ops_t; typedef struct camera_device { /** * camera_device.common.version must be in the range * HARDWARE_DEVICE_API_VERSION(0,0)-(1,FF). CAMERA_DEVICE_API_VERSION_1_0 is * recommended. */ hw_device_t common; camera_device_ops_t *ops; void *priv; } camera_device_t; __END_DECLS #endif /* #ifdef ANDROID_INCLUDE_CAMERA_H */