191 lines
7.1 KiB
C++
191 lines
7.1 KiB
C++
/*
|
|
* 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>
|
|
#include <ui/Overlay.h>
|
|
|
|
namespace android {
|
|
|
|
/** Callback for startPreview() */
|
|
typedef void (*preview_callback)(const sp<IMemory>& mem, void* user);
|
|
|
|
/** Callback for startRecord() */
|
|
typedef void (*recording_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;
|
|
|
|
/** Return the IMemoryHeap for the raw image heap */
|
|
virtual sp<IMemoryHeap> getRawHeap() 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;
|
|
/**
|
|
* 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 recording_callback()
|
|
* is called with the user parameter. Every record frame must be released
|
|
* by calling releaseRecordingFrame().
|
|
*/
|
|
virtual status_t startRecording(recording_callback cb, void* user) = 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 the recording_callback()
|
|
* passed to startRecord().
|
|
*/
|
|
virtual void releaseRecordingFrame(const sp<IMemory>& mem) = 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
|