/*
* 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 <log/log.h>
#include "EmulatedFakeCamera.h"
#include "EmulatedFakeCameraDevice.h"
#undef min
#undef max
#include <algorithm>
namespace android {
static const double kCheckXSpeed = 0.00000000096;
static const double kCheckYSpeed = 0.00000000032;
static const double kSquareXSpeed = 0.000000000096;
static const double kSquareYSpeed = 0.000000000160;
static const nsecs_t kSquareColorChangeIntervalNs = seconds(5);
EmulatedFakeCameraDevice::EmulatedFakeCameraDevice(EmulatedFakeCamera* camera_hal)
: EmulatedCameraDevice(camera_hal),
mBlackYUV(kBlack32),
mWhiteYUV(kWhite32),
mRedYUV(kRed8),
mGreenYUV(kGreen8),
mBlueYUV(kBlue8),
mSquareColor(&mRedYUV),
mLastRedrawn(0),
mLastColorChange(0),
mCheckX(0),
mCheckY(0),
mSquareX(0),
mSquareY(0),
mSquareXSpeed(kSquareXSpeed),
mSquareYSpeed(kSquareYSpeed)
#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:
mFrameVOffset = mYStride * mFrameHeight;
mFrameUOffset = mFrameVOffset + mUVStride * (mFrameHeight / 2);
mUVStep = 1;
break;
case V4L2_PIX_FMT_YUV420:
mFrameUOffset = mYStride * mFrameHeight;
mFrameVOffset = mFrameUOffset + mUVStride * (mFrameHeight / 2);
mUVStep = 1;
break;
case V4L2_PIX_FMT_NV21:
/* Interleaved UV pane, V first. */
mFrameVOffset = mYStride * mFrameHeight;
mFrameUOffset = mFrameVOffset + 1;
mUVStep = 2;
break;
case V4L2_PIX_FMT_NV12:
/* Interleaved UV pane, U first. */
mFrameUOffset = mYStride * mFrameHeight;
mFrameVOffset = mFrameUOffset + 1;
mUVStep = 2;
break;
default:
ALOGE("%s: Unknown pixel format %.4s", __FUNCTION__,
reinterpret_cast<const char*>(&mPixelFormat));
return EINVAL;
}
mLastRedrawn = systemTime(SYSTEM_TIME_MONOTONIC);
mLastColorChange = mLastRedrawn;
/* 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;
}
EmulatedCameraDevice::commonStopDevice();
mState = ECDS_CONNECTED;
return NO_ERROR;
}
/****************************************************************************
* Worker thread management overrides.
***************************************************************************/
bool EmulatedFakeCameraDevice::produceFrame(void* buffer, int64_t* timestamp)
{
#if EFCD_ROTATE_FRAME
const int frame_type = rotateFrame();
switch (frame_type) {
case 0:
drawCheckerboard(buffer);
break;
case 1:
drawStripes(buffer);
break;
case 2:
drawSolid(buffer, mCurrentColor);
break;
}
#else
drawCheckerboard(buffer);
#endif // EFCD_ROTATE_FRAME
if (timestamp != nullptr) {
*timestamp = 0L;
}
return true;
}
/****************************************************************************
* Fake camera device private API
***************************************************************************/
void EmulatedFakeCameraDevice::drawCheckerboard(void* buffer)
{
nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
nsecs_t elapsed = now - mLastRedrawn;
uint8_t* currentFrame = reinterpret_cast<uint8_t*>(buffer);
uint8_t* frameU = currentFrame + mFrameUOffset;
uint8_t* frameV = currentFrame + mFrameVOffset;
const int size = std::min(mFrameWidth, mFrameHeight) / 10;
bool black = true;
if (size == 0) {
// When this happens, it happens at a very high rate,
// so don't log any messages and just return.
return;
}
mCheckX += kCheckXSpeed * elapsed;
mCheckY += kCheckYSpeed * elapsed;
// Allow the X and Y values to transition across two checkerboard boxes
// before resetting it back. This allows for the gray to black transition.
// Note that this is in screen size independent coordinates so that frames
// will look similar regardless of resolution
if (mCheckX > 2.0) {
mCheckX -= 2.0;
}
if (mCheckY > 2.0) {
mCheckY -= 2.0;
}
// Are we in the gray or black zone?
if (mCheckX >= 1.0)
black = false;
if (mCheckY >= 1.0)
black = !black;
int county = static_cast<int>(mCheckY * size) % size;
int checkxremainder = static_cast<int>(mCheckX * size) % size;
YUVPixel adjustedWhite = YUVPixel(mWhiteYUV);
changeWhiteBalance(adjustedWhite.Y, adjustedWhite.U, adjustedWhite.V);
adjustedWhite.Y = changeExposure(adjustedWhite.Y);
YUVPixel adjustedBlack = YUVPixel(mBlackYUV);
adjustedBlack.Y = changeExposure(adjustedBlack.Y);
for(int y = 0; y < mFrameHeight; y++) {
int countx = checkxremainder;
bool current = black;
uint8_t* Y = currentFrame + mYStride * y;
uint8_t* U = frameU + mUVStride * (y / 2);
uint8_t* V = frameV + mUVStride * (y / 2);
for(int x = 0; x < mFrameWidth; x += 2) {
if (current) {
adjustedBlack.get(Y, U, V);
} else {
adjustedWhite.get(Y, U, V);
}
Y[1] = *Y;
Y += 2; U += mUVStep; V += mUVStep;
countx += 2;
if(countx >= size) {
countx = 0;
current = !current;
}
}
if(county++ >= size) {
county = 0;
black = !black;
}
}
/* Run the square. */
const int squareSize = std::min(mFrameWidth, mFrameHeight) / 4;
mSquareX += mSquareXSpeed * elapsed;
mSquareY += mSquareYSpeed * elapsed;
int squareX = mSquareX * mFrameWidth;
int squareY = mSquareY * mFrameHeight;
if (squareX + squareSize > mFrameWidth) {
mSquareXSpeed = -mSquareXSpeed;
double relativeWidth = static_cast<double>(squareSize) / mFrameWidth;
mSquareX -= 2.0 * (mSquareX + relativeWidth - 1.0);
squareX = mSquareX * mFrameWidth;
} else if (squareX < 0) {
mSquareXSpeed = -mSquareXSpeed;
mSquareX = -mSquareX;
squareX = mSquareX * mFrameWidth;
}
if (squareY + squareSize > mFrameHeight) {
mSquareYSpeed = -mSquareYSpeed;
double relativeHeight = static_cast<double>(squareSize) / mFrameHeight;
mSquareY -= 2.0 * (mSquareY + relativeHeight - 1.0);
squareY = mSquareY * mFrameHeight;
} else if (squareY < 0) {
mSquareYSpeed = -mSquareYSpeed;
mSquareY = -mSquareY;
squareY = mSquareY * mFrameHeight;
}
if (now - mLastColorChange > kSquareColorChangeIntervalNs) {
mLastColorChange = now;
mSquareColor = mSquareColor == &mRedYUV ? &mGreenYUV : &mRedYUV;
}
drawSquare(buffer, squareX, squareY, squareSize, mSquareColor);
mLastRedrawn = now;
}
void EmulatedFakeCameraDevice::drawSquare(void* buffer,
int x,
int y,
int size,
const YUVPixel* color)
{
uint8_t* currentFrame = reinterpret_cast<uint8_t*>(buffer);
uint8_t* frameU = currentFrame + mFrameUOffset;
uint8_t* frameV = currentFrame + mFrameVOffset;
const int square_xstop = std::min(mFrameWidth, x + size);
const int square_ystop = std::min(mFrameHeight, y + size);
uint8_t* Y_pos = currentFrame + y * mYStride + x;
YUVPixel adjustedColor = *color;
changeWhiteBalance(adjustedColor.Y, adjustedColor.U, adjustedColor.V);
// Draw the square.
for (; y < square_ystop; y++) {
const int iUV = (y / 2) * mUVStride + (x / 2) * mUVStep;
uint8_t* sqU = frameU + iUV;
uint8_t* sqV = frameV + 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 += mYStride;
}
}
#if EFCD_ROTATE_FRAME
void EmulatedFakeCameraDevice::drawSolid(void* buffer, YUVPixel* color)
{
YUVPixel adjustedColor = *color;
changeWhiteBalance(adjustedColor.Y, adjustedColor.U, adjustedColor.V);
/* All Ys are the same, will fill any alignment padding but that's OK */
memset(mCurrentFrame, changeExposure(adjustedColor.Y),
mFrameHeight * mYStride);
/* Fill U, and V panes. */
for (int y = 0; y < mFrameHeight / 2; ++y) {
uint8_t* U = mFrameU + y * mUVStride;
uint8_t* V = mFrameV + y * mUVStride;
for (int x = 0; x < mFrameWidth / 2; ++x, U += mUVStep, V += mUVStep) {
*U = color->U;
*V = color->V;
}
}
}
void EmulatedFakeCameraDevice::drawStripes(void* buffer)
{
/* 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 += mYStride) {
/* 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) * mUVStride;
/* 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 */