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/*
* Copyright (C) 2011 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.
*/
/*
* Contains implementation of a class EmulatedFakeCameraDevice that encapsulates
* fake camera device.
*/
#define LOG_NDEBUG 0
#define LOG_TAG "EmulatedCamera_FakeDevice"
#include <cutils/log.h>
#include "EmulatedFakeCamera.h"
#include "EmulatedFakeCameraDevice.h"
namespace android {
EmulatedFakeCameraDevice::EmulatedFakeCameraDevice(EmulatedFakeCamera* camera_hal)
: EmulatedCameraDevice(camera_hal),
mBlackYUV(kBlack32),
mWhiteYUV(kWhite32),
mRedYUV(kRed8),
mGreenYUV(kGreen8),
mBlueYUV(kBlue8),
mLastRedrawn(0),
mCheckX(0),
mCheckY(0),
mCcounter(0)
#if EFCD_ROTATE_FRAME
, mLastRotatedAt(0),
mCurrentFrameType(0),
mCurrentColor(&mWhiteYUV)
#endif // EFCD_ROTATE_FRAME
{
// Makes the image with the original exposure compensation darker.
// So the effects of changing the exposure compensation can be seen.
mBlackYUV.Y = mBlackYUV.Y / 2;
mWhiteYUV.Y = mWhiteYUV.Y / 2;
mRedYUV.Y = mRedYUV.Y / 2;
mGreenYUV.Y = mGreenYUV.Y / 2;
mBlueYUV.Y = mBlueYUV.Y / 2;
}
EmulatedFakeCameraDevice::~EmulatedFakeCameraDevice()
{
}
/****************************************************************************
* Emulated camera device abstract interface implementation.
***************************************************************************/
status_t EmulatedFakeCameraDevice::connectDevice()
{
ALOGV("%s", __FUNCTION__);
Mutex::Autolock locker(&mObjectLock);
if (!isInitialized()) {
ALOGE("%s: Fake camera device is not initialized.", __FUNCTION__);
return EINVAL;
}
if (isConnected()) {
ALOGW("%s: Fake camera device is already connected.", __FUNCTION__);
return NO_ERROR;
}
/* There is no device to connect to. */
mState = ECDS_CONNECTED;
return NO_ERROR;
}
status_t EmulatedFakeCameraDevice::disconnectDevice()
{
ALOGV("%s", __FUNCTION__);
Mutex::Autolock locker(&mObjectLock);
if (!isConnected()) {
ALOGW("%s: Fake camera device is already disconnected.", __FUNCTION__);
return NO_ERROR;
}
if (isStarted()) {
ALOGE("%s: Cannot disconnect from the started device.", __FUNCTION__);
return EINVAL;
}
/* There is no device to disconnect from. */
mState = ECDS_INITIALIZED;
return NO_ERROR;
}
status_t EmulatedFakeCameraDevice::startDevice(int width,
int height,
uint32_t pix_fmt)
{
ALOGV("%s", __FUNCTION__);
Mutex::Autolock locker(&mObjectLock);
if (!isConnected()) {
ALOGE("%s: Fake camera device is not connected.", __FUNCTION__);
return EINVAL;
}
if (isStarted()) {
ALOGE("%s: Fake camera device is already started.", __FUNCTION__);
return EINVAL;
}
/* Initialize the base class. */
const status_t res =
EmulatedCameraDevice::commonStartDevice(width, height, pix_fmt);
if (res == NO_ERROR) {
/* Calculate U/V panes inside the framebuffer. */
switch (mPixelFormat) {
case V4L2_PIX_FMT_YVU420:
mFrameV = mCurrentFrame + mTotalPixels;
mFrameU = mFrameU + mTotalPixels / 4;
mUVStep = 1;
mUVTotalNum = mTotalPixels / 4;
break;
case V4L2_PIX_FMT_YUV420:
mFrameU = mCurrentFrame + mTotalPixels;
mFrameV = mFrameU + mTotalPixels / 4;
mUVStep = 1;
mUVTotalNum = mTotalPixels / 4;
break;
case V4L2_PIX_FMT_NV21:
/* Interleaved UV pane, V first. */
mFrameV = mCurrentFrame + mTotalPixels;
mFrameU = mFrameV + 1;
mUVStep = 2;
mUVTotalNum = mTotalPixels / 4;
break;
case V4L2_PIX_FMT_NV12:
/* Interleaved UV pane, U first. */
mFrameU = mCurrentFrame + mTotalPixels;
mFrameV = mFrameU + 1;
mUVStep = 2;
mUVTotalNum = mTotalPixels / 4;
break;
default:
ALOGE("%s: Unknown pixel format %.4s", __FUNCTION__,
reinterpret_cast<const char*>(&mPixelFormat));
return EINVAL;
}
/* Number of items in a single row inside U/V panes. */
mUVInRow = (width / 2) * mUVStep;
mState = ECDS_STARTED;
} else {
ALOGE("%s: commonStartDevice failed", __FUNCTION__);
}
return res;
}
status_t EmulatedFakeCameraDevice::stopDevice()
{
ALOGV("%s", __FUNCTION__);
Mutex::Autolock locker(&mObjectLock);
if (!isStarted()) {
ALOGW("%s: Fake camera device is not started.", __FUNCTION__);
return NO_ERROR;
}
mFrameU = mFrameV = NULL;
EmulatedCameraDevice::commonStopDevice();
mState = ECDS_CONNECTED;
return NO_ERROR;
}
/****************************************************************************
* Worker thread management overrides.
***************************************************************************/
bool EmulatedFakeCameraDevice::inWorkerThread()
{
/* Wait till FPS timeout expires, or thread exit message is received. */
WorkerThread::SelectRes res =
getWorkerThread()->Select(-1, 1000000 / mEmulatedFPS);
if (res == WorkerThread::EXIT_THREAD) {
ALOGV("%s: Worker thread has been terminated.", __FUNCTION__);
return false;
}
/* Lets see if we need to generate a new frame. */
if ((systemTime(SYSTEM_TIME_MONOTONIC) - mLastRedrawn) >= mRedrawAfter) {
/*
* Time to generate a new frame.
*/
#if EFCD_ROTATE_FRAME
const int frame_type = rotateFrame();
switch (frame_type) {
case 0:
drawCheckerboard();
break;
case 1:
drawStripes();
break;
case 2:
drawSolid(mCurrentColor);
break;
}
#else
/* Draw the checker board. */
drawCheckerboard();
#endif // EFCD_ROTATE_FRAME
mLastRedrawn = systemTime(SYSTEM_TIME_MONOTONIC);
}
/* Timestamp the current frame, and notify the camera HAL about new frame. */
mCurFrameTimestamp = systemTime(SYSTEM_TIME_MONOTONIC);
mCameraHAL->onNextFrameAvailable(mCurrentFrame, mCurFrameTimestamp, this);
return true;
}
/****************************************************************************
* Fake camera device private API
***************************************************************************/
void EmulatedFakeCameraDevice::drawCheckerboard()
{
const int size = mFrameWidth / 10;
bool black = true;
if((mCheckX / size) & 1)
black = false;
if((mCheckY / size) & 1)
black = !black;
int county = mCheckY % size;
int checkxremainder = mCheckX % size;
uint8_t* Y = mCurrentFrame;
uint8_t* U_pos = mFrameU;
uint8_t* V_pos = mFrameV;
uint8_t* U = U_pos;
uint8_t* V = V_pos;
YUVPixel adjustedWhite = YUVPixel(mWhiteYUV);
changeWhiteBalance(adjustedWhite.Y, adjustedWhite.U, adjustedWhite.V);
for(int y = 0; y < mFrameHeight; y++) {
int countx = checkxremainder;
bool current = black;
for(int x = 0; x < mFrameWidth; x += 2) {
if (current) {
mBlackYUV.get(Y, U, V);
} else {
adjustedWhite.get(Y, U, V);
}
*Y = changeExposure(*Y);
Y[1] = *Y;
Y += 2; U += mUVStep; V += mUVStep;
countx += 2;
if(countx >= size) {
countx = 0;
current = !current;
}
}
if (y & 0x1) {
U_pos = U;
V_pos = V;
} else {
U = U_pos;
V = V_pos;
}
if(county++ >= size) {
county = 0;
black = !black;
}
}
mCheckX += 3;
mCheckY++;
/* Run the square. */
int sqx = ((mCcounter * 3) & 255);
if(sqx > 128) sqx = 255 - sqx;
int sqy = ((mCcounter * 5) & 255);
if(sqy > 128) sqy = 255 - sqy;
const int sqsize = mFrameWidth / 10;
drawSquare(sqx * sqsize / 32, sqy * sqsize / 32, (sqsize * 5) >> 1,
(mCcounter & 0x100) ? &mRedYUV : &mGreenYUV);
mCcounter++;
}
void EmulatedFakeCameraDevice::drawSquare(int x,
int y,
int size,
const YUVPixel* color)
{
const int square_xstop = min(mFrameWidth, x + size);
const int square_ystop = min(mFrameHeight, y + size);
uint8_t* Y_pos = mCurrentFrame + y * mFrameWidth + x;
YUVPixel adjustedColor = *color;
changeWhiteBalance(adjustedColor.Y, adjustedColor.U, adjustedColor.V);
// Draw the square.
for (; y < square_ystop; y++) {
const int iUV = (y / 2) * mUVInRow + (x / 2) * mUVStep;
uint8_t* sqU = mFrameU + iUV;
uint8_t* sqV = mFrameV + iUV;
uint8_t* sqY = Y_pos;
for (int i = x; i < square_xstop; i += 2) {
adjustedColor.get(sqY, sqU, sqV);
*sqY = changeExposure(*sqY);
sqY[1] = *sqY;
sqY += 2; sqU += mUVStep; sqV += mUVStep;
}
Y_pos += mFrameWidth;
}
}
#if EFCD_ROTATE_FRAME
void EmulatedFakeCameraDevice::drawSolid(YUVPixel* color)
{
YUVPixel adjustedColor = *color;
changeWhiteBalance(adjustedColor.Y, adjustedColor.U, adjustedColor.V);
/* All Ys are the same. */
memset(mCurrentFrame, changeExposure(adjustedColor.Y), mTotalPixels);
/* Fill U, and V panes. */
uint8_t* U = mFrameU;
uint8_t* V = mFrameV;
for (int k = 0; k < mUVTotalNum; k++, U += mUVStep, V += mUVStep) {
*U = color->U;
*V = color->V;
}
}
void EmulatedFakeCameraDevice::drawStripes()
{
/* Divide frame into 4 stripes. */
const int change_color_at = mFrameHeight / 4;
const int each_in_row = mUVInRow / mUVStep;
uint8_t* pY = mCurrentFrame;
for (int y = 0; y < mFrameHeight; y++, pY += mFrameWidth) {
/* Select the color. */
YUVPixel* color;
const int color_index = y / change_color_at;
if (color_index == 0) {
/* White stripe on top. */
color = &mWhiteYUV;
} else if (color_index == 1) {
/* Then the red stripe. */
color = &mRedYUV;
} else if (color_index == 2) {
/* Then the green stripe. */
color = &mGreenYUV;
} else {
/* And the blue stripe at the bottom. */
color = &mBlueYUV;
}
changeWhiteBalance(color->Y, color->U, color->V);
/* All Ys at the row are the same. */
memset(pY, changeExposure(color->Y), mFrameWidth);
/* Offset of the current row inside U/V panes. */
const int uv_off = (y / 2) * mUVInRow;
/* Fill U, and V panes. */
uint8_t* U = mFrameU + uv_off;
uint8_t* V = mFrameV + uv_off;
for (int k = 0; k < each_in_row; k++, U += mUVStep, V += mUVStep) {
*U = color->U;
*V = color->V;
}
}
}
int EmulatedFakeCameraDevice::rotateFrame()
{
if ((systemTime(SYSTEM_TIME_MONOTONIC) - mLastRotatedAt) >= mRotateFreq) {
mLastRotatedAt = systemTime(SYSTEM_TIME_MONOTONIC);
mCurrentFrameType++;
if (mCurrentFrameType > 2) {
mCurrentFrameType = 0;
}
if (mCurrentFrameType == 2) {
ALOGD("********** Rotated to the SOLID COLOR frame **********");
/* Solid color: lets rotate color too. */
if (mCurrentColor == &mWhiteYUV) {
ALOGD("----- Painting a solid RED frame -----");
mCurrentColor = &mRedYUV;
} else if (mCurrentColor == &mRedYUV) {
ALOGD("----- Painting a solid GREEN frame -----");
mCurrentColor = &mGreenYUV;
} else if (mCurrentColor == &mGreenYUV) {
ALOGD("----- Painting a solid BLUE frame -----");
mCurrentColor = &mBlueYUV;
} else {
/* Back to white. */
ALOGD("----- Painting a solid WHITE frame -----");
mCurrentColor = &mWhiteYUV;
}
} else if (mCurrentFrameType == 0) {
ALOGD("********** Rotated to the CHECKERBOARD frame **********");
} else if (mCurrentFrameType == 1) {
ALOGD("********** Rotated to the STRIPED frame **********");
}
}
return mCurrentFrameType;
}
#endif // EFCD_ROTATE_FRAME
}; /* namespace android */