156 lines
5.9 KiB
C++
156 lines
5.9 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_HARDWARE_CAMERA_HARDWARE_INTERFACE_H
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#define ANDROID_HARDWARE_CAMERA_HARDWARE_INTERFACE_H
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#include <utils/IMemory.h>
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#include <utils/RefBase.h>
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#include <ui/CameraParameters.h>
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namespace android {
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/** Callback for startPreview() */
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typedef void (*preview_callback)(const sp<IMemory>& mem, void* user);
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/** Callback for takePicture() */
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typedef void (*shutter_callback)(void* user);
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/** Callback for takePicture() */
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typedef void (*raw_callback)(const sp<IMemory>& mem, void* user);
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/** Callback for takePicture() */
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typedef void (*jpeg_callback)(const sp<IMemory>& mem, void* user);
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/** Callback for autoFocus() */
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typedef void (*autofocus_callback)(bool focused, void* user);
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/**
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* CameraHardwareInterface.h defines the interface to the
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* camera hardware abstraction layer, used for setting and getting
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* parameters, live previewing, and taking pictures.
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*
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* It is a referenced counted interface with RefBase as its base class.
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* CameraService calls openCameraHardware() to retrieve a strong pointer to the
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* instance of this interface and may be called multiple times. The
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* following steps describe a typical sequence:
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*
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* -# After CameraService calls openCameraHardware(), getParameters() and
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* setParameters() are used to initialize the camera instance.
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* CameraService calls getPreviewHeap() to establish access to the
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* preview heap so it can be registered with SurfaceFlinger for
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* efficient display updating while in preview mode.
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* -# startPreview() is called, which is passed a preview_callback()
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* function and a user parameter. The camera instance then periodically
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* calls preview_callback() each time a new preview frame is available.
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* The callback routine has two parameters: the first is a pointer to
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* the IMemory containing the frame and the second a user parameter. If
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* the preview_callback code needs to use this memory after returning,
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* it must copy the data.
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*
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* Prior to taking a picture, CameraService calls autofocus() with
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* autofocus_callback() and a user parameter. When auto focusing has
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* completed, the camera instance calls autofocus_callback(), which informs
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* the application whether focusing was successful. The camera instance
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* only calls autofocus_callback() once and it is up to the application to
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* call autoFocus() again if refocusing is desired.
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*
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* CameraService calls takePicture() to request the camera instance take a
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* picture. This method has two callbacks: raw_callback() and jpeg_callback().
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* When the raw image is available, raw_callback() is called with a pointer
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* to the IMemory containing the raw image. When the jpeg image is available,
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* jpeg_callback() is called with a pointer to the IMemory containing the
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* jpeg image. As with preview_callback(), the memory must be copied if it's
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* needed after returning.
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*/
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class CameraHardwareInterface : public virtual RefBase {
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public:
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virtual ~CameraHardwareInterface() { }
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/** Return the IMemoryHeap for the preview image heap */
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virtual sp<IMemoryHeap> getPreviewHeap() const = 0;
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/**
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* Start preview mode. When a preview image is available
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* preview_callback is called with the user parameter. The
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* call back parameter may be null.
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*/
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virtual status_t startPreview(preview_callback cb, void* user) = 0;
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/**
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* Stop a previously started preview.
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*/
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virtual void stopPreview() = 0;
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/**
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* Returns true if preview is enabled.
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*/
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virtual bool previewEnabled() = 0;
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/**
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* Start auto focus, the callback routine is called
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* once when focusing is complete. autoFocus() will
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* be called again if another auto focus is needed.
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*/
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virtual status_t autoFocus(autofocus_callback,
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void* user) = 0;
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/**
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* Take a picture. The raw_callback is called when
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* the uncompressed image is available. The jpeg_callback
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* is called when the compressed image is available. These
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* call backs may be null. The user parameter is passed
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* to each of the call back routines.
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*/
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virtual status_t takePicture(shutter_callback,
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raw_callback,
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jpeg_callback,
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void* user) = 0;
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/**
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* Cancel a picture that was started with takePicture. You may cancel any
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* of the shutter, raw, or jpeg callbacks. Calling this method when no
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* picture is being taken is a no-op.
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*/
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virtual status_t cancelPicture(bool cancel_shutter,
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bool cancel_raw,
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bool cancel_jpeg) = 0;
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/** Set the camera parameters. */
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virtual status_t setParameters(const CameraParameters& params) = 0;
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/** Return the camera parameters. */
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virtual CameraParameters getParameters() const = 0;
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/**
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* Release the hardware resources owned by this object. Note that this is
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* *not* done in the destructor.
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*/
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virtual void release() = 0;
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/**
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* Dump state of the camera hardware
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*/
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virtual status_t dump(int fd, const Vector<String16>& args) const = 0;
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};
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/** factory function to instantiate a camera hardware object */
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extern "C" sp<CameraHardwareInterface> openCameraHardware();
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}; // namespace android
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#endif
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