2 * Copyright (C) 2010-2011 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 // FIXME: add well-defined names for cameras
19 #ifndef ANDROID_INCLUDE_CAMERA_H
20 #define ANDROID_INCLUDE_CAMERA_H
23 #include <sys/cdefs.h>
24 #include <sys/types.h>
25 #include <cutils/native_handle.h>
26 #include <system/camera.h>
27 #include <hardware/hardware.h>
28 #include <hardware/gralloc.h>
33 * The id of this module
35 #define CAMERA_HARDWARE_MODULE_ID "camera"
39 * The direction that the camera faces to. It should be CAMERA_FACING_BACK
40 * or CAMERA_FACING_FRONT.
45 * The orientation of the camera image. The value is the angle that the
46 * camera image needs to be rotated clockwise so it shows correctly on the
47 * display in its natural orientation. It should be 0, 90, 180, or 270.
49 * For example, suppose a device has a naturally tall screen. The
50 * back-facing camera sensor is mounted in landscape. You are looking at
51 * the screen. If the top side of the camera sensor is aligned with the
52 * right edge of the screen in natural orientation, the value should be
53 * 90. If the top side of a front-facing camera sensor is aligned with the
54 * right of the screen, the value should be 270.
59 typedef struct camera_module {
61 int (*get_number_of_cameras)(void);
62 int (*get_camera_info)(int camera_id, struct camera_info *info);
66 typedef void (*camera_release_memory)(struct camera_memory *mem);
68 typedef struct camera_memory {
72 camera_release_memory release;
75 typedef camera_memory_t* (*camera_request_memory)(int fd, size_t buf_size, unsigned int num_bufs,
78 typedef void (*camera_notify_callback)(int32_t msg_type,
83 typedef void (*camera_data_callback)(int32_t msg_type,
84 const camera_memory_t *data, unsigned int index,
87 typedef void (*camera_data_timestamp_callback)(int64_t timestamp,
89 const camera_memory_t *data, unsigned int index,
92 #define HAL_CAMERA_PREVIEW_WINDOW_TAG 0xcafed00d
94 typedef struct preview_stream_ops {
95 int (*dequeue_buffer)(struct preview_stream_ops* w,
96 buffer_handle_t** buffer, int *stride);
97 int (*enqueue_buffer)(struct preview_stream_ops* w,
98 buffer_handle_t* buffer);
99 int (*cancel_buffer)(struct preview_stream_ops* w,
100 buffer_handle_t* buffer);
101 int (*set_buffer_count)(struct preview_stream_ops* w, int count);
102 int (*set_buffers_geometry)(struct preview_stream_ops* pw,
103 int w, int h, int format);
104 int (*set_crop)(struct preview_stream_ops *w,
105 int left, int top, int right, int bottom);
106 int (*set_usage)(struct preview_stream_ops* w, int usage);
107 int (*set_swap_interval)(struct preview_stream_ops *w, int interval);
108 int (*get_min_undequeued_buffer_count)(const struct preview_stream_ops *w,
110 int (*lock_buffer)(struct preview_stream_ops* w,
111 buffer_handle_t* buffer);
112 } preview_stream_ops_t;
114 struct camera_device;
115 typedef struct camera_device_ops {
116 /** Set the ANativeWindow to which preview frames are sent */
117 int (*set_preview_window)(struct camera_device *,
118 struct preview_stream_ops *window);
120 /** Set the notification and data callbacks */
121 void (*set_callbacks)(struct camera_device *,
122 camera_notify_callback notify_cb,
123 camera_data_callback data_cb,
124 camera_data_timestamp_callback data_cb_timestamp,
125 camera_request_memory get_memory,
129 * The following three functions all take a msg_type, which is a bitmask of
130 * the messages defined in include/ui/Camera.h
134 * Enable a message, or set of messages.
136 void (*enable_msg_type)(struct camera_device *, int32_t msg_type);
139 * Disable a message, or a set of messages.
141 * Once received a call to disableMsgType(CAMERA_MSG_VIDEO_FRAME), camera
142 * HAL should not rely on its client to call releaseRecordingFrame() to
143 * release video recording frames sent out by the cameral HAL before and
144 * after the disableMsgType(CAMERA_MSG_VIDEO_FRAME) call. Camera HAL
145 * clients must not modify/access any video recording frame after calling
146 * disableMsgType(CAMERA_MSG_VIDEO_FRAME).
148 void (*disable_msg_type)(struct camera_device *, int32_t msg_type);
151 * Query whether a message, or a set of messages, is enabled. Note that
152 * this is operates as an AND, if any of the messages queried are off, this
155 int (*msg_type_enabled)(struct camera_device *, int32_t msg_type);
158 * Start preview mode.
160 int (*start_preview)(struct camera_device *);
163 * Stop a previously started preview.
165 void (*stop_preview)(struct camera_device *);
168 * Returns true if preview is enabled.
170 int (*preview_enabled)(struct camera_device *);
173 * Request the camera HAL to store meta data or real YUV data in the video
174 * buffers sent out via CAMERA_MSG_VIDEO_FRAME for a recording session. If
175 * it is not called, the default camera HAL behavior is to store real YUV
176 * data in the video buffers.
178 * This method should be called before startRecording() in order to be
181 * If meta data is stored in the video buffers, it is up to the receiver of
182 * the video buffers to interpret the contents and to find the actual frame
183 * data with the help of the meta data in the buffer. How this is done is
184 * outside of the scope of this method.
186 * Some camera HALs may not support storing meta data in the video buffers,
187 * but all camera HALs should support storing real YUV data in the video
188 * buffers. If the camera HAL does not support storing the meta data in the
189 * video buffers when it is requested to do do, INVALID_OPERATION must be
190 * returned. It is very useful for the camera HAL to pass meta data rather
191 * than the actual frame data directly to the video encoder, since the
192 * amount of the uncompressed frame data can be very large if video size is
195 * @param enable if true to instruct the camera HAL to store
196 * meta data in the video buffers; false to instruct
197 * the camera HAL to store real YUV data in the video
200 * @return OK on success.
202 int (*store_meta_data_in_buffers)(struct camera_device *, int enable);
205 * Start record mode. When a record image is available, a
206 * CAMERA_MSG_VIDEO_FRAME message is sent with the corresponding
207 * frame. Every record frame must be released by a camera HAL client via
208 * releaseRecordingFrame() before the client calls
209 * disableMsgType(CAMERA_MSG_VIDEO_FRAME). After the client calls
210 * disableMsgType(CAMERA_MSG_VIDEO_FRAME), it is the camera HAL's
211 * responsibility to manage the life-cycle of the video recording frames,
212 * and the client must not modify/access any video recording frames.
214 int (*start_recording)(struct camera_device *);
217 * Stop a previously started recording.
219 void (*stop_recording)(struct camera_device *);
222 * Returns true if recording is enabled.
224 int (*recording_enabled)(struct camera_device *);
227 * Release a record frame previously returned by CAMERA_MSG_VIDEO_FRAME.
229 * It is camera HAL client's responsibility to release video recording
230 * frames sent out by the camera HAL before the camera HAL receives a call
231 * to disableMsgType(CAMERA_MSG_VIDEO_FRAME). After it receives the call to
232 * disableMsgType(CAMERA_MSG_VIDEO_FRAME), it is the camera HAL's
233 * responsibility to manage the life-cycle of the video recording frames.
235 void (*release_recording_frame)(struct camera_device *,
239 * Start auto focus, the notification callback routine is called with
240 * CAMERA_MSG_FOCUS once when focusing is complete. autoFocus() will be
241 * called again if another auto focus is needed.
243 int (*auto_focus)(struct camera_device *);
246 * Cancels auto-focus function. If the auto-focus is still in progress,
247 * this function will cancel it. Whether the auto-focus is in progress or
248 * not, this function will return the focus position to the default. If
249 * the camera does not support auto-focus, this is a no-op.
251 int (*cancel_auto_focus)(struct camera_device *);
256 int (*take_picture)(struct camera_device *);
259 * Cancel a picture that was started with takePicture. Calling this method
260 * when no picture is being taken is a no-op.
262 int (*cancel_picture)(struct camera_device *);
265 * Set the camera parameters. This returns BAD_VALUE if any parameter is
266 * invalid or not supported.
268 int (*set_parameters)(struct camera_device *, const char *parms);
270 /** Retrieve the camera parameters. The buffer returned by the camera HAL
271 must be returned back to it with put_parameters, if put_parameters
274 char *(*get_parameters)(struct camera_device *);
276 /** The camera HAL uses its own memory to pass us the parameters when we
277 call get_parameters. Use this function to return the memory back to
278 the camera HAL, if put_parameters is not NULL. If put_parameters
279 is NULL, then you have to use free() to release the memory.
281 void (*put_parameters)(struct camera_device *, char *);
284 * Send command to camera driver.
286 int (*send_command)(struct camera_device *,
287 int32_t cmd, int32_t arg1, int32_t arg2);
290 * Release the hardware resources owned by this object. Note that this is
291 * *not* done in the destructor.
293 void (*release)(struct camera_device *);
296 * Dump state of the camera hardware
298 int (*dump)(struct camera_device *, int fd);
299 } camera_device_ops_t;
301 typedef struct camera_device {
303 camera_device_ops_t *ops;
309 #endif /* ANDROID_INCLUDE_CAMERA_H */