| /* |
| * Copyright (C) 2008 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_HARDWARE_CAMERA_HARDWARE_INTERFACE_H |
| #define ANDROID_HARDWARE_CAMERA_HARDWARE_INTERFACE_H |
| |
| #include <binder/IMemory.h> |
| #include <utils/RefBase.h> |
| #include <surfaceflinger/ISurface.h> |
| #include <camera/Camera.h> |
| #include <camera/CameraParameters.h> |
| |
| namespace android { |
| |
| class Overlay; |
| |
| /** |
| * The size of image for display. |
| */ |
| typedef struct image_rect_struct |
| { |
| uint32_t width; /* Image width */ |
| uint32_t height; /* Image height */ |
| } image_rect_type; |
| |
| |
| typedef void (*notify_callback)(int32_t msgType, |
| int32_t ext1, |
| int32_t ext2, |
| void* user); |
| |
| typedef void (*data_callback)(int32_t msgType, |
| const sp<IMemory>& dataPtr, |
| void* user); |
| |
| typedef void (*data_callback_timestamp)(nsecs_t timestamp, |
| int32_t msgType, |
| const sp<IMemory>& dataPtr, |
| void* user); |
| |
| /** |
| * CameraHardwareInterface.h defines the interface to the |
| * camera hardware abstraction layer, used for setting and getting |
| * parameters, live previewing, and taking pictures. |
| * |
| * It is a referenced counted interface with RefBase as its base class. |
| * CameraService calls openCameraHardware() to retrieve a strong pointer to the |
| * instance of this interface and may be called multiple times. The |
| * following steps describe a typical sequence: |
| * |
| * -# After CameraService calls openCameraHardware(), getParameters() and |
| * setParameters() are used to initialize the camera instance. |
| * CameraService calls getPreviewHeap() to establish access to the |
| * preview heap so it can be registered with SurfaceFlinger for |
| * efficient display updating while in preview mode. |
| * -# startPreview() is called. The camera instance then periodically |
| * sends the message CAMERA_MSG_PREVIEW_FRAME (if enabled) each time |
| * a new preview frame is available. If data callback code needs to use |
| * this memory after returning, it must copy the data. |
| * |
| * Prior to taking a picture, CameraService calls autofocus(). When auto |
| * focusing has completed, the camera instance sends a CAMERA_MSG_FOCUS notification, |
| * which informs the application whether focusing was successful. The camera instance |
| * only sends this message once and it is up to the application to call autoFocus() |
| * again if refocusing is desired. |
| * |
| * CameraService calls takePicture() to request the camera instance take a |
| * picture. At this point, if a shutter, postview, raw, and/or compressed callback |
| * is desired, the corresponding message must be enabled. As with CAMERA_MSG_PREVIEW_FRAME, |
| * any memory provided in a data callback must be copied if it's needed after returning. |
| */ |
| class CameraHardwareInterface : public virtual RefBase { |
| public: |
| virtual ~CameraHardwareInterface() { } |
| |
| /** Return the IMemoryHeap for the preview image heap */ |
| virtual sp<IMemoryHeap> getPreviewHeap() const = 0; |
| |
| /** Return the IMemoryHeap for the raw image heap */ |
| virtual sp<IMemoryHeap> getRawHeap() const = 0; |
| |
| /** Set the notification and data callbacks */ |
| virtual void setCallbacks(notify_callback notify_cb, |
| data_callback data_cb, |
| data_callback_timestamp data_cb_timestamp, |
| void* user) = 0; |
| |
| /** |
| * The following three functions all take a msgtype, |
| * which is a bitmask of the messages defined in |
| * include/ui/Camera.h |
| */ |
| |
| /** |
| * Enable a message, or set of messages. |
| */ |
| virtual void enableMsgType(int32_t msgType) = 0; |
| |
| /** |
| * Disable a message, or a set of messages. |
| */ |
| virtual void disableMsgType(int32_t msgType) = 0; |
| |
| /** |
| * 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. |
| */ |
| virtual bool msgTypeEnabled(int32_t msgType) = 0; |
| |
| /** |
| * Start preview mode. |
| */ |
| virtual status_t startPreview() = 0; |
| |
| /** |
| * Only used if overlays are used for camera preview. |
| */ |
| virtual bool useOverlay() {return false;} |
| virtual status_t setOverlay(const sp<Overlay> &overlay) {return BAD_VALUE;} |
| |
| /** |
| * Stop a previously started preview. |
| */ |
| virtual void stopPreview() = 0; |
| |
| /** |
| * Returns true if preview is enabled. |
| */ |
| virtual bool previewEnabled() = 0; |
| |
| /** |
| * 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 calling releaseRecordingFrame(). |
| */ |
| virtual status_t startRecording() = 0; |
| |
| /** |
| * Stop a previously started recording. |
| */ |
| virtual void stopRecording() = 0; |
| |
| /** |
| * Returns true if recording is enabled. |
| */ |
| virtual bool recordingEnabled() = 0; |
| |
| /** |
| * Release a record frame previously returned by CAMERA_MSG_VIDEO_FRAME. |
| */ |
| virtual void releaseRecordingFrame(const sp<IMemory>& mem) = 0; |
| |
| /** |
| * 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. |
| */ |
| virtual status_t autoFocus() = 0; |
| |
| /** |
| * 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. |
| */ |
| virtual status_t cancelAutoFocus() = 0; |
| |
| /** |
| * Take a picture. |
| */ |
| virtual status_t takePicture() = 0; |
| |
| /** |
| * Cancel a picture that was started with takePicture. Calling this |
| * method when no picture is being taken is a no-op. |
| */ |
| virtual status_t cancelPicture() = 0; |
| |
| /** Set the camera parameters. */ |
| virtual status_t setParameters(const CameraParameters& params) = 0; |
| |
| /** Return the camera parameters. */ |
| virtual CameraParameters getParameters() const = 0; |
| |
| /** |
| * Send command to camera driver. |
| */ |
| virtual status_t sendCommand(int32_t cmd, int32_t arg1, int32_t arg2) = 0; |
| |
| /** |
| * Release the hardware resources owned by this object. Note that this is |
| * *not* done in the destructor. |
| */ |
| virtual void release() = 0; |
| |
| /** |
| * Dump state of the camera hardware |
| */ |
| virtual status_t dump(int fd, const Vector<String16>& args) const = 0; |
| }; |
| |
| /** |
| * The functions need to be provided by the camera HAL. |
| * |
| * If getNumberOfCameras() returns N, the valid cameraId for getCameraInfo() |
| * and openCameraHardware() is 0 to N-1. |
| */ |
| extern "C" int HAL_getNumberOfCameras(); |
| extern "C" void HAL_getCameraInfo(int cameraId, struct CameraInfo* cameraInfo); |
| /* HAL should return NULL if it fails to open camera hardware. */ |
| extern "C" sp<CameraHardwareInterface> HAL_openCameraHardware(int cameraId); |
| |
| }; // namespace android |
| |
| #endif |
