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/*
* 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 <ui/ISurface.h>
#include <ui/Camera.h>
#include <ui/CameraParameters.h>
#include <ui/Overlay.h>
namespace android {
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;
/**
* 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;
};
/** factory function to instantiate a camera hardware object */
extern "C" sp<CameraHardwareInterface> openCameraHardware();
}; // namespace android
#endif
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