services/camera/libcameraservice/CameraHardwareStub.cpp - platform/frameworks/base - Gitiles

 /*
 **
 ** Copyright 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.
 */

 #define LOG_TAG "CameraHardwareStub"
 #include <utils/Log.h>

 #include "CameraHardwareStub.h"
 #include <utils/threads.h>
 #include <fcntl.h>
 #include <sys/mman.h>

 #include "CannedJpeg.h"

 namespace android {

 CameraHardwareStub::CameraHardwareStub()
                   : mParameters(),
                     mPreviewHeap(0),
                     mRawHeap(0),
                     mFakeCamera(0),
                     mPreviewFrameSize(0),
                     mNotifyCb(0),
                     mDataCb(0),
                     mDataCbTimestamp(0),
                     mCallbackCookie(0),
                     mMsgEnabled(0),
                     mCurrentPreviewFrame(0)
 {
     initDefaultParameters();
 }

 void CameraHardwareStub::initDefaultParameters()
 {
     CameraParameters p;

     p.set(CameraParameters::KEY_SUPPORTED_PREVIEW_SIZES, "320x240");
     p.setPreviewSize(320, 240);
     p.setPreviewFrameRate(15);
     p.setPreviewFormat(CameraParameters::PIXEL_FORMAT_YUV420SP);

     p.set(CameraParameters::KEY_SUPPORTED_PICTURE_SIZES, "320x240");
     p.setPictureSize(320, 240);
     p.setPictureFormat(CameraParameters::PIXEL_FORMAT_JPEG);

     if (setParameters(p) != NO_ERROR) {
         LOGE("Failed to set default parameters?!");
     }
 }

 void CameraHardwareStub::initHeapLocked()
 {
     // Create raw heap.
     int picture_width, picture_height;
     mParameters.getPictureSize(&picture_width, &picture_height);
     mRawHeap = new MemoryHeapBase(picture_width * picture_height * 3 / 2);

     int preview_width, preview_height;
     mParameters.getPreviewSize(&preview_width, &preview_height);
     ALOGD("initHeapLocked: preview size=%dx%d", preview_width, preview_height);

     // Note that we enforce yuv420sp in setParameters().
     int how_big = preview_width * preview_height * 3 / 2;

     // If we are being reinitialized to the same size as before, no
     // work needs to be done.
     if (how_big == mPreviewFrameSize)
         return;

     mPreviewFrameSize = how_big;

     // Make a new mmap'ed heap that can be shared across processes.
     // use code below to test with pmem
     mPreviewHeap = new MemoryHeapBase(mPreviewFrameSize * kBufferCount);
     // Make an IMemory for each frame so that we can reuse them in callbacks.
     for (int i = 0; i < kBufferCount; i++) {
         mBuffers[i] = new MemoryBase(mPreviewHeap, i * mPreviewFrameSize, mPreviewFrameSize);
     }

     // Recreate the fake camera to reflect the current size.
     delete mFakeCamera;
     mFakeCamera = new FakeCamera(preview_width, preview_height);
 }

 CameraHardwareStub::~CameraHardwareStub()
 {
     delete mFakeCamera;
     mFakeCamera = 0; // paranoia
 }

 status_t CameraHardwareStub::setPreviewWindow(const sp<ANativeWindow>& buf)
 {
     return NO_ERROR;
 }

 sp<IMemoryHeap> CameraHardwareStub::getRawHeap() const
 {
     return mRawHeap;
 }

 void CameraHardwareStub::setCallbacks(notify_callback notify_cb,
                                       data_callback data_cb,
                                       data_callback_timestamp data_cb_timestamp,
                                       void* user)
 {
     Mutex::Autolock lock(mLock);
     mNotifyCb = notify_cb;
     mDataCb = data_cb;
     mDataCbTimestamp = data_cb_timestamp;
     mCallbackCookie = user;
 }

 void CameraHardwareStub::enableMsgType(int32_t msgType)
 {
     Mutex::Autolock lock(mLock);
     mMsgEnabled |= msgType;
 }

 void CameraHardwareStub::disableMsgType(int32_t msgType)
 {
     Mutex::Autolock lock(mLock);
     mMsgEnabled &= ~msgType;
 }

 bool CameraHardwareStub::msgTypeEnabled(int32_t msgType)
 {
     Mutex::Autolock lock(mLock);
     return (mMsgEnabled & msgType);
 }

 // ---------------------------------------------------------------------------

 int CameraHardwareStub::previewThread()
 {
     mLock.lock();
         // the attributes below can change under our feet...

         int previewFrameRate = mParameters.getPreviewFrameRate();

         // Find the offset within the heap of the current buffer.
         ssize_t offset = mCurrentPreviewFrame * mPreviewFrameSize;

         sp<MemoryHeapBase> heap = mPreviewHeap;

         // this assumes the internal state of fake camera doesn't change
         // (or is thread safe)
         FakeCamera* fakeCamera = mFakeCamera;

         sp<MemoryBase> buffer = mBuffers[mCurrentPreviewFrame];

     mLock.unlock();

     // TODO: here check all the conditions that could go wrong
     if (buffer != 0) {
         // Calculate how long to wait between frames.
         int delay = (int)(1000000.0f / float(previewFrameRate));

         // This is always valid, even if the client died -- the memory
         // is still mapped in our process.
         void *base = heap->base();

         // Fill the current frame with the fake camera.
         uint8_t *frame = ((uint8_t *)base) + offset;
         fakeCamera->getNextFrameAsYuv420(frame);

         //ALOGV("previewThread: generated frame to buffer %d", mCurrentPreviewFrame);

         // Notify the client of a new frame.
         if (mMsgEnabled & CAMERA_MSG_PREVIEW_FRAME)
             mDataCb(CAMERA_MSG_PREVIEW_FRAME, buffer, NULL, mCallbackCookie);

         // Advance the buffer pointer.
         mCurrentPreviewFrame = (mCurrentPreviewFrame + 1) % kBufferCount;

         // Wait for it...
         usleep(delay);
     }

     return NO_ERROR;
 }

 status_t CameraHardwareStub::startPreview()
 {
     Mutex::Autolock lock(mLock);
     if (mPreviewThread != 0) {
         // already running
         return INVALID_OPERATION;
     }
     mPreviewThread = new PreviewThread(this);
     return NO_ERROR;
 }

 void CameraHardwareStub::stopPreview()
 {
     sp<PreviewThread> previewThread;

     { // scope for the lock
         Mutex::Autolock lock(mLock);
         previewThread = mPreviewThread;
     }

     // don't hold the lock while waiting for the thread to quit
     if (previewThread != 0) {
         previewThread->requestExitAndWait();
     }

     Mutex::Autolock lock(mLock);
     mPreviewThread.clear();
 }

 bool CameraHardwareStub::previewEnabled() {
     return mPreviewThread != 0;
 }

 status_t CameraHardwareStub::startRecording()
 {
     return UNKNOWN_ERROR;
 }

 void CameraHardwareStub::stopRecording()
 {
 }

 bool CameraHardwareStub::recordingEnabled()
 {
     return false;
 }

 void CameraHardwareStub::releaseRecordingFrame(const sp<IMemory>& mem)
 {
 }

 // ---------------------------------------------------------------------------

 int CameraHardwareStub::beginAutoFocusThread(void *cookie)
 {
     CameraHardwareStub *c = (CameraHardwareStub *)cookie;
     return c->autoFocusThread();
 }

 int CameraHardwareStub::autoFocusThread()
 {
     if (mMsgEnabled & CAMERA_MSG_FOCUS)
         mNotifyCb(CAMERA_MSG_FOCUS, true, 0, mCallbackCookie);
     return NO_ERROR;
 }

 status_t CameraHardwareStub::autoFocus()
 {
     Mutex::Autolock lock(mLock);
     if (createThread(beginAutoFocusThread, this) == false)
         return UNKNOWN_ERROR;
     return NO_ERROR;
 }

 status_t CameraHardwareStub::cancelAutoFocus()
 {
     return NO_ERROR;
 }

 /*static*/ int CameraHardwareStub::beginPictureThread(void *cookie)
 {
     CameraHardwareStub *c = (CameraHardwareStub *)cookie;
     return c->pictureThread();
 }

 int CameraHardwareStub::pictureThread()
 {
     if (mMsgEnabled & CAMERA_MSG_SHUTTER)
         mNotifyCb(CAMERA_MSG_SHUTTER, 0, 0, mCallbackCookie);

     if (mMsgEnabled & CAMERA_MSG_RAW_IMAGE) {
         //FIXME: use a canned YUV image!
         // In the meantime just make another fake camera picture.
         int w, h;
         mParameters.getPictureSize(&w, &h);
         sp<MemoryBase> mem = new MemoryBase(mRawHeap, 0, w * h * 3 / 2);
         FakeCamera cam(w, h);
         cam.getNextFrameAsYuv420((uint8_t *)mRawHeap->base());
         mDataCb(CAMERA_MSG_RAW_IMAGE, mem, NULL, mCallbackCookie);
     }

     if (mMsgEnabled & CAMERA_MSG_COMPRESSED_IMAGE) {
         sp<MemoryHeapBase> heap = new MemoryHeapBase(kCannedJpegSize);
         sp<MemoryBase> mem = new MemoryBase(heap, 0, kCannedJpegSize);
         memcpy(heap->base(), kCannedJpeg, kCannedJpegSize);
         mDataCb(CAMERA_MSG_COMPRESSED_IMAGE, mem, NULL, mCallbackCookie);
     }
     return NO_ERROR;
 }

 status_t CameraHardwareStub::takePicture()
 {
     stopPreview();
     if (createThread(beginPictureThread, this) == false)
         return UNKNOWN_ERROR;
     return NO_ERROR;
 }

 status_t CameraHardwareStub::cancelPicture()
 {
     return NO_ERROR;
 }

 status_t CameraHardwareStub::dump(int fd, const Vector<String16>& args) const
 {
     const size_t SIZE = 256;
     char buffer[SIZE];
     String8 result;
     AutoMutex lock(&mLock);
     if (mFakeCamera != 0) {
         mFakeCamera->dump(fd);
         mParameters.dump(fd, args);
         snprintf(buffer, 255, " preview frame(%d), size (%d), running(%s)\n", mCurrentPreviewFrame, mPreviewFrameSize, mPreviewRunning?"true": "false");
         result.append(buffer);
     } else {
         result.append("No camera client yet.\n");
     }
     write(fd, result.string(), result.size());
     return NO_ERROR;
 }

 status_t CameraHardwareStub::setParameters(const CameraParameters& params)
 {
     Mutex::Autolock lock(mLock);
     // XXX verify params

     if (strcmp(params.getPreviewFormat(),
         CameraParameters::PIXEL_FORMAT_YUV420SP) != 0) {
         LOGE("Only yuv420sp preview is supported");
         return -1;
     }

     if (strcmp(params.getPictureFormat(),
         CameraParameters::PIXEL_FORMAT_JPEG) != 0) {
         LOGE("Only jpeg still pictures are supported");
         return -1;
     }

     int w, h;
     params.getPictureSize(&w, &h);
     if (w != kCannedJpegWidth && h != kCannedJpegHeight) {
         LOGE("Still picture size must be size of canned JPEG (%dx%d)",
              kCannedJpegWidth, kCannedJpegHeight);
         return -1;
     }

     mParameters = params;
     initHeapLocked();

     return NO_ERROR;
 }

 CameraParameters CameraHardwareStub::getParameters() const
 {
     Mutex::Autolock lock(mLock);
     return mParameters;
 }

 status_t CameraHardwareStub::sendCommand(int32_t command, int32_t arg1,
                                          int32_t arg2)
 {
     return BAD_VALUE;
 }

 void CameraHardwareStub::release()
 {
 }

 sp<CameraHardwareInterface> CameraHardwareStub::createInstance()
 {
     return new CameraHardwareStub();
 }

 static CameraInfo sCameraInfo[] = {
     {
         CAMERA_FACING_BACK,
         90,  /* orientation */
     }
 };

 extern "C" int HAL_getNumberOfCameras()
 {
     return sizeof(sCameraInfo) / sizeof(sCameraInfo[0]);
 }

 extern "C" void HAL_getCameraInfo(int cameraId, struct CameraInfo* cameraInfo)
 {
     memcpy(cameraInfo, &sCameraInfo[cameraId], sizeof(CameraInfo));
 }

 extern "C" sp<CameraHardwareInterface> HAL_openCameraHardware(int cameraId)
 {
     return CameraHardwareStub::createInstance();
 }

 }; // namespace android
	/*
	**
	** Copyright 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.
	*/

	#define LOG_TAG "CameraHardwareStub"
	#include <utils/Log.h>

	#include "CameraHardwareStub.h"
	#include <utils/threads.h>
	#include <fcntl.h>
	#include <sys/mman.h>

	#include "CannedJpeg.h"

	namespace android {

	CameraHardwareStub::CameraHardwareStub()
	: mParameters(),
	mPreviewHeap(0),
	mRawHeap(0),
	mFakeCamera(0),
	mPreviewFrameSize(0),
	mNotifyCb(0),
	mDataCb(0),
	mDataCbTimestamp(0),
	mCallbackCookie(0),
	mMsgEnabled(0),
	mCurrentPreviewFrame(0)
	{
	initDefaultParameters();
	}

	void CameraHardwareStub::initDefaultParameters()
	{
	CameraParameters p;

	p.set(CameraParameters::KEY_SUPPORTED_PREVIEW_SIZES, "320x240");
	p.setPreviewSize(320, 240);
	p.setPreviewFrameRate(15);
	p.setPreviewFormat(CameraParameters::PIXEL_FORMAT_YUV420SP);

	p.set(CameraParameters::KEY_SUPPORTED_PICTURE_SIZES, "320x240");
	p.setPictureSize(320, 240);
	p.setPictureFormat(CameraParameters::PIXEL_FORMAT_JPEG);

	if (setParameters(p) != NO_ERROR) {
	LOGE("Failed to set default parameters?!");
	}
	}

	void CameraHardwareStub::initHeapLocked()
	{
	// Create raw heap.
	int picture_width, picture_height;
	mParameters.getPictureSize(&picture_width, &picture_height);
	mRawHeap = new MemoryHeapBase(picture_width * picture_height * 3 / 2);

	int preview_width, preview_height;
	mParameters.getPreviewSize(&preview_width, &preview_height);
	ALOGD("initHeapLocked: preview size=%dx%d", preview_width, preview_height);

	// Note that we enforce yuv420sp in setParameters().
	int how_big = preview_width * preview_height * 3 / 2;

	// If we are being reinitialized to the same size as before, no
	// work needs to be done.
	if (how_big == mPreviewFrameSize)
	return;

	mPreviewFrameSize = how_big;

	// Make a new mmap'ed heap that can be shared across processes.
	// use code below to test with pmem
	mPreviewHeap = new MemoryHeapBase(mPreviewFrameSize * kBufferCount);
	// Make an IMemory for each frame so that we can reuse them in callbacks.
	for (int i = 0; i < kBufferCount; i++) {
	mBuffers[i] = new MemoryBase(mPreviewHeap, i * mPreviewFrameSize, mPreviewFrameSize);
	}

	// Recreate the fake camera to reflect the current size.
	delete mFakeCamera;
	mFakeCamera = new FakeCamera(preview_width, preview_height);
	}

	CameraHardwareStub::~CameraHardwareStub()
	{
	delete mFakeCamera;
	mFakeCamera = 0; // paranoia
	}

	status_t CameraHardwareStub::setPreviewWindow(const sp<ANativeWindow>& buf)
	{
	return NO_ERROR;
	}

	sp<IMemoryHeap> CameraHardwareStub::getRawHeap() const
	{
	return mRawHeap;
	}

	void CameraHardwareStub::setCallbacks(notify_callback notify_cb,
	data_callback data_cb,
	data_callback_timestamp data_cb_timestamp,
	void* user)
	{
	Mutex::Autolock lock(mLock);
	mNotifyCb = notify_cb;
	mDataCb = data_cb;
	mDataCbTimestamp = data_cb_timestamp;
	mCallbackCookie = user;
	}

	void CameraHardwareStub::enableMsgType(int32_t msgType)
	{
	Mutex::Autolock lock(mLock);
	mMsgEnabled \|= msgType;
	}

	void CameraHardwareStub::disableMsgType(int32_t msgType)
	{
	Mutex::Autolock lock(mLock);
	mMsgEnabled &= ~msgType;
	}

	bool CameraHardwareStub::msgTypeEnabled(int32_t msgType)
	{
	Mutex::Autolock lock(mLock);
	return (mMsgEnabled & msgType);
	}

	// ---------------------------------------------------------------------------

	int CameraHardwareStub::previewThread()
	{
	mLock.lock();
	// the attributes below can change under our feet...

	int previewFrameRate = mParameters.getPreviewFrameRate();

	// Find the offset within the heap of the current buffer.
	ssize_t offset = mCurrentPreviewFrame * mPreviewFrameSize;

	sp<MemoryHeapBase> heap = mPreviewHeap;

	// this assumes the internal state of fake camera doesn't change
	// (or is thread safe)
	FakeCamera* fakeCamera = mFakeCamera;

	sp<MemoryBase> buffer = mBuffers[mCurrentPreviewFrame];

	mLock.unlock();

	// TODO: here check all the conditions that could go wrong
	if (buffer != 0) {
	// Calculate how long to wait between frames.
	int delay = (int)(1000000.0f / float(previewFrameRate));

	// This is always valid, even if the client died -- the memory
	// is still mapped in our process.
	void *base = heap->base();

	// Fill the current frame with the fake camera.
	uint8_t frame = ((uint8_t )base) + offset;
	fakeCamera->getNextFrameAsYuv420(frame);

	//ALOGV("previewThread: generated frame to buffer %d", mCurrentPreviewFrame);

	// Notify the client of a new frame.
	if (mMsgEnabled & CAMERA_MSG_PREVIEW_FRAME)
	mDataCb(CAMERA_MSG_PREVIEW_FRAME, buffer, NULL, mCallbackCookie);

	// Advance the buffer pointer.
	mCurrentPreviewFrame = (mCurrentPreviewFrame + 1) % kBufferCount;

	// Wait for it...
	usleep(delay);
	}

	return NO_ERROR;
	}

	status_t CameraHardwareStub::startPreview()
	{
	Mutex::Autolock lock(mLock);
	if (mPreviewThread != 0) {
	// already running
	return INVALID_OPERATION;
	}
	mPreviewThread = new PreviewThread(this);
	return NO_ERROR;
	}

	void CameraHardwareStub::stopPreview()
	{
	sp<PreviewThread> previewThread;

	{ // scope for the lock
	Mutex::Autolock lock(mLock);
	previewThread = mPreviewThread;
	}

	// don't hold the lock while waiting for the thread to quit
	if (previewThread != 0) {
	previewThread->requestExitAndWait();
	}

	Mutex::Autolock lock(mLock);
	mPreviewThread.clear();
	}

	bool CameraHardwareStub::previewEnabled() {
	return mPreviewThread != 0;
	}

	status_t CameraHardwareStub::startRecording()
	{
	return UNKNOWN_ERROR;
	}

	void CameraHardwareStub::stopRecording()
	{
	}

	bool CameraHardwareStub::recordingEnabled()
	{
	return false;
	}

	void CameraHardwareStub::releaseRecordingFrame(const sp<IMemory>& mem)
	{
	}

	// ---------------------------------------------------------------------------

	int CameraHardwareStub::beginAutoFocusThread(void *cookie)
	{
	CameraHardwareStub c = (CameraHardwareStub )cookie;
	return c->autoFocusThread();
	}

	int CameraHardwareStub::autoFocusThread()
	{
	if (mMsgEnabled & CAMERA_MSG_FOCUS)
	mNotifyCb(CAMERA_MSG_FOCUS, true, 0, mCallbackCookie);
	return NO_ERROR;
	}

	status_t CameraHardwareStub::autoFocus()
	{
	Mutex::Autolock lock(mLock);
	if (createThread(beginAutoFocusThread, this) == false)
	return UNKNOWN_ERROR;
	return NO_ERROR;
	}

	status_t CameraHardwareStub::cancelAutoFocus()
	{
	return NO_ERROR;
	}

	/static/ int CameraHardwareStub::beginPictureThread(void *cookie)
	{
	CameraHardwareStub c = (CameraHardwareStub )cookie;
	return c->pictureThread();
	}

	int CameraHardwareStub::pictureThread()
	{
	if (mMsgEnabled & CAMERA_MSG_SHUTTER)
	mNotifyCb(CAMERA_MSG_SHUTTER, 0, 0, mCallbackCookie);

	if (mMsgEnabled & CAMERA_MSG_RAW_IMAGE) {
	//FIXME: use a canned YUV image!
	// In the meantime just make another fake camera picture.
	int w, h;
	mParameters.getPictureSize(&w, &h);
	sp<MemoryBase> mem = new MemoryBase(mRawHeap, 0, w * h * 3 / 2);
	FakeCamera cam(w, h);
	cam.getNextFrameAsYuv420((uint8_t *)mRawHeap->base());
	mDataCb(CAMERA_MSG_RAW_IMAGE, mem, NULL, mCallbackCookie);
	}

	if (mMsgEnabled & CAMERA_MSG_COMPRESSED_IMAGE) {
	sp<MemoryHeapBase> heap = new MemoryHeapBase(kCannedJpegSize);
	sp<MemoryBase> mem = new MemoryBase(heap, 0, kCannedJpegSize);
	memcpy(heap->base(), kCannedJpeg, kCannedJpegSize);
	mDataCb(CAMERA_MSG_COMPRESSED_IMAGE, mem, NULL, mCallbackCookie);
	}
	return NO_ERROR;
	}

	status_t CameraHardwareStub::takePicture()
	{
	stopPreview();
	if (createThread(beginPictureThread, this) == false)
	return UNKNOWN_ERROR;
	return NO_ERROR;
	}

	status_t CameraHardwareStub::cancelPicture()
	{
	return NO_ERROR;
	}

	status_t CameraHardwareStub::dump(int fd, const Vector<String16>& args) const
	{
	const size_t SIZE = 256;
	char buffer[SIZE];
	String8 result;
	AutoMutex lock(&mLock);
	if (mFakeCamera != 0) {
	mFakeCamera->dump(fd);
	mParameters.dump(fd, args);
	snprintf(buffer, 255, " preview frame(%d), size (%d), running(%s)\n", mCurrentPreviewFrame, mPreviewFrameSize, mPreviewRunning?"true": "false");
	result.append(buffer);
	} else {
	result.append("No camera client yet.\n");
	}
	write(fd, result.string(), result.size());
	return NO_ERROR;
	}

	status_t CameraHardwareStub::setParameters(const CameraParameters& params)
	{
	Mutex::Autolock lock(mLock);
	// XXX verify params

	if (strcmp(params.getPreviewFormat(),
	CameraParameters::PIXEL_FORMAT_YUV420SP) != 0) {
	LOGE("Only yuv420sp preview is supported");
	return -1;
	}

	if (strcmp(params.getPictureFormat(),
	CameraParameters::PIXEL_FORMAT_JPEG) != 0) {
	LOGE("Only jpeg still pictures are supported");
	return -1;
	}

	int w, h;
	params.getPictureSize(&w, &h);
	if (w != kCannedJpegWidth && h != kCannedJpegHeight) {
	LOGE("Still picture size must be size of canned JPEG (%dx%d)",
	kCannedJpegWidth, kCannedJpegHeight);
	return -1;
	}

	mParameters = params;
	initHeapLocked();

	return NO_ERROR;
	}

	CameraParameters CameraHardwareStub::getParameters() const
	{
	Mutex::Autolock lock(mLock);
	return mParameters;
	}

	status_t CameraHardwareStub::sendCommand(int32_t command, int32_t arg1,
	int32_t arg2)
	{
	return BAD_VALUE;
	}

	void CameraHardwareStub::release()
	{
	}

	sp<CameraHardwareInterface> CameraHardwareStub::createInstance()
	{
	return new CameraHardwareStub();
	}

	static CameraInfo sCameraInfo[] = {
	{
	CAMERA_FACING_BACK,
	90, /* orientation */
	}
	};

	extern "C" int HAL_getNumberOfCameras()
	{
	return sizeof(sCameraInfo) / sizeof(sCameraInfo[0]);
	}

	extern "C" void HAL_getCameraInfo(int cameraId, struct CameraInfo* cameraInfo)
	{
	memcpy(cameraInfo, &sCameraInfo[cameraId], sizeof(CameraInfo));
	}

	extern "C" sp<CameraHardwareInterface> HAL_openCameraHardware(int cameraId)
	{
	return CameraHardwareStub::createInstance();
	}

	}; // namespace android