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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 <utils/IMemory.h>
#include <utils/RefBase.h>
#include <ui/CameraParameters.h>
namespace android {
/** Callback for startPreview() */
typedef void (*preview_callback)(const sp<IMemory>& mem, void* user);
/** Callback for takePicture() */
typedef void (*shutter_callback)(void* user);
/** Callback for takePicture() */
typedef void (*raw_callback)(const sp<IMemory>& mem, void* user);
/** Callback for takePicture() */
typedef void (*jpeg_callback)(const sp<IMemory>& mem, void* user);
/** Callback for autoFocus() */
typedef void (*autofocus_callback)(bool focused, 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, which is passed a preview_callback()
* function and a user parameter. The camera instance then periodically
* calls preview_callback() each time a new preview frame is available.
* The callback routine has two parameters: the first is a pointer to
* the IMemory containing the frame and the second a user parameter. If
* the preview_callback code needs to use this memory after returning,
* it must copy the data.
*
* Prior to taking a picture, CameraService calls autofocus() with
* autofocus_callback() and a user parameter. When auto focusing has
* completed, the camera instance calls autofocus_callback(), which informs
* the application whether focusing was successful. The camera instance
* only calls autofocus_callback() 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. This method has two callbacks: raw_callback() and jpeg_callback().
* When the raw image is available, raw_callback() is called with a pointer
* to the IMemory containing the raw image. When the jpeg image is available,
* jpeg_callback() is called with a pointer to the IMemory containing the
* jpeg image. As with preview_callback(), the memory 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;
/**
* Start preview mode. When a preview image is available
* preview_callback is called with the user parameter. The
* call back parameter may be null.
*/
virtual status_t startPreview(preview_callback cb, void* user) = 0;
/**
* Stop a previously started preview.
*/
virtual void stopPreview() = 0;
/**
* Returns true if preview is enabled.
*/
virtual bool previewEnabled() = 0;
/**
* Start auto focus, the callback routine is called
* once when focusing is complete. autoFocus() will
* be called again if another auto focus is needed.
*/
virtual status_t autoFocus(autofocus_callback,
void* user) = 0;
/**
* Take a picture. The raw_callback is called when
* the uncompressed image is available. The jpeg_callback
* is called when the compressed image is available. These
* call backs may be null. The user parameter is passed
* to each of the call back routines.
*/
virtual status_t takePicture(shutter_callback,
raw_callback,
jpeg_callback,
void* user) = 0;
/**
* Cancel a picture that was started with takePicture. You may cancel any
* of the shutter, raw, or jpeg callbacks. Calling this method when no
* picture is being taken is a no-op.
*/
virtual status_t cancelPicture(bool cancel_shutter,
bool cancel_raw,
bool cancel_jpeg) = 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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