1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /*
18 * Contains implementation of a class EmulatedFakeCameraDevice that encapsulates
19 * fake camera device.
20 */
21
22 #define LOG_NDEBUG 0
23 #define LOG_TAG "EmulatedCamera_FakeDevice"
24 #include <cutils/log.h>
25 #include "EmulatedFakeCamera.h"
26 #include "EmulatedFakeCameraDevice.h"
27
28 #undef min
29 #undef max
30 #include <algorithm>
31
32 namespace android {
33
34 static const double kCheckXSpeed = 0.00000000096;
35 static const double kCheckYSpeed = 0.00000000032;
36
37 static const double kSquareXSpeed = 0.000000000096;
38 static const double kSquareYSpeed = 0.000000000160;
39
40 static const nsecs_t kSquareColorChangeIntervalNs = seconds(5);
41
EmulatedFakeCameraDevice(EmulatedFakeCamera * camera_hal)42 EmulatedFakeCameraDevice::EmulatedFakeCameraDevice(EmulatedFakeCamera* camera_hal)
43 : EmulatedCameraDevice(camera_hal),
44 mBlackYUV(kBlack32),
45 mWhiteYUV(kWhite32),
46 mRedYUV(kRed8),
47 mGreenYUV(kGreen8),
48 mBlueYUV(kBlue8),
49 mSquareColor(&mRedYUV),
50 mLastRedrawn(0),
51 mLastColorChange(0),
52 mCheckX(0),
53 mCheckY(0),
54 mSquareX(0),
55 mSquareY(0),
56 mSquareXSpeed(kSquareXSpeed),
57 mSquareYSpeed(kSquareYSpeed)
58 #if EFCD_ROTATE_FRAME
59 , mLastRotatedAt(0),
60 mCurrentFrameType(0),
61 mCurrentColor(&mWhiteYUV)
62 #endif // EFCD_ROTATE_FRAME
63 {
64 // Makes the image with the original exposure compensation darker.
65 // So the effects of changing the exposure compensation can be seen.
66 mBlackYUV.Y = mBlackYUV.Y / 2;
67 mWhiteYUV.Y = mWhiteYUV.Y / 2;
68 mRedYUV.Y = mRedYUV.Y / 2;
69 mGreenYUV.Y = mGreenYUV.Y / 2;
70 mBlueYUV.Y = mBlueYUV.Y / 2;
71 }
72
~EmulatedFakeCameraDevice()73 EmulatedFakeCameraDevice::~EmulatedFakeCameraDevice()
74 {
75 }
76
77 /****************************************************************************
78 * Emulated camera device abstract interface implementation.
79 ***************************************************************************/
80
connectDevice()81 status_t EmulatedFakeCameraDevice::connectDevice()
82 {
83 ALOGV("%s", __FUNCTION__);
84
85 Mutex::Autolock locker(&mObjectLock);
86 if (!isInitialized()) {
87 ALOGE("%s: Fake camera device is not initialized.", __FUNCTION__);
88 return EINVAL;
89 }
90 if (isConnected()) {
91 ALOGW("%s: Fake camera device is already connected.", __FUNCTION__);
92 return NO_ERROR;
93 }
94
95 /* There is no device to connect to. */
96 mState = ECDS_CONNECTED;
97
98 return NO_ERROR;
99 }
100
disconnectDevice()101 status_t EmulatedFakeCameraDevice::disconnectDevice()
102 {
103 ALOGV("%s", __FUNCTION__);
104
105 Mutex::Autolock locker(&mObjectLock);
106 if (!isConnected()) {
107 ALOGW("%s: Fake camera device is already disconnected.", __FUNCTION__);
108 return NO_ERROR;
109 }
110 if (isStarted()) {
111 ALOGE("%s: Cannot disconnect from the started device.", __FUNCTION__);
112 return EINVAL;
113 }
114
115 /* There is no device to disconnect from. */
116 mState = ECDS_INITIALIZED;
117
118 return NO_ERROR;
119 }
120
startDevice(int width,int height,uint32_t pix_fmt)121 status_t EmulatedFakeCameraDevice::startDevice(int width,
122 int height,
123 uint32_t pix_fmt)
124 {
125 ALOGV("%s", __FUNCTION__);
126
127 Mutex::Autolock locker(&mObjectLock);
128 if (!isConnected()) {
129 ALOGE("%s: Fake camera device is not connected.", __FUNCTION__);
130 return EINVAL;
131 }
132 if (isStarted()) {
133 ALOGE("%s: Fake camera device is already started.", __FUNCTION__);
134 return EINVAL;
135 }
136
137 /* Initialize the base class. */
138 const status_t res =
139 EmulatedCameraDevice::commonStartDevice(width, height, pix_fmt);
140 if (res == NO_ERROR) {
141 /* Calculate U/V panes inside the framebuffer. */
142 switch (mPixelFormat) {
143 case V4L2_PIX_FMT_YVU420:
144 mFrameVOffset = mYStride * mFrameHeight;
145 mFrameUOffset = mFrameVOffset + mUVStride * (mFrameHeight / 2);
146 mUVStep = 1;
147 break;
148
149 case V4L2_PIX_FMT_YUV420:
150 mFrameUOffset = mYStride * mFrameHeight;
151 mFrameVOffset = mFrameUOffset + mUVStride * (mFrameHeight / 2);
152 mUVStep = 1;
153 break;
154
155 case V4L2_PIX_FMT_NV21:
156 /* Interleaved UV pane, V first. */
157 mFrameVOffset = mYStride * mFrameHeight;
158 mFrameUOffset = mFrameVOffset + 1;
159 mUVStep = 2;
160 break;
161
162 case V4L2_PIX_FMT_NV12:
163 /* Interleaved UV pane, U first. */
164 mFrameUOffset = mYStride * mFrameHeight;
165 mFrameVOffset = mFrameUOffset + 1;
166 mUVStep = 2;
167 break;
168
169 default:
170 ALOGE("%s: Unknown pixel format %.4s", __FUNCTION__,
171 reinterpret_cast<const char*>(&mPixelFormat));
172 return EINVAL;
173 }
174 mLastRedrawn = systemTime(SYSTEM_TIME_MONOTONIC);
175 mLastColorChange = mLastRedrawn;
176 /* Number of items in a single row inside U/V panes. */
177 mUVInRow = (width / 2) * mUVStep;
178 mState = ECDS_STARTED;
179 } else {
180 ALOGE("%s: commonStartDevice failed", __FUNCTION__);
181 }
182
183 return res;
184 }
185
stopDevice()186 status_t EmulatedFakeCameraDevice::stopDevice()
187 {
188 ALOGV("%s", __FUNCTION__);
189
190 Mutex::Autolock locker(&mObjectLock);
191 if (!isStarted()) {
192 ALOGW("%s: Fake camera device is not started.", __FUNCTION__);
193 return NO_ERROR;
194 }
195
196 EmulatedCameraDevice::commonStopDevice();
197 mState = ECDS_CONNECTED;
198
199 return NO_ERROR;
200 }
201
202 /****************************************************************************
203 * Worker thread management overrides.
204 ***************************************************************************/
205
produceFrame(void * buffer)206 bool EmulatedFakeCameraDevice::produceFrame(void* buffer)
207 {
208 #if EFCD_ROTATE_FRAME
209 const int frame_type = rotateFrame();
210 switch (frame_type) {
211 case 0:
212 drawCheckerboard(buffer);
213 break;
214 case 1:
215 drawStripes(buffer);
216 break;
217 case 2:
218 drawSolid(buffer, mCurrentColor);
219 break;
220 }
221 #else
222 drawCheckerboard(buffer);
223 #endif // EFCD_ROTATE_FRAME
224 return true;
225 }
226
227 /****************************************************************************
228 * Fake camera device private API
229 ***************************************************************************/
230
drawCheckerboard(void * buffer)231 void EmulatedFakeCameraDevice::drawCheckerboard(void* buffer)
232 {
233 nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
234 nsecs_t elapsed = now - mLastRedrawn;
235 uint8_t* currentFrame = reinterpret_cast<uint8_t*>(buffer);
236 uint8_t* frameU = currentFrame + mFrameUOffset;
237 uint8_t* frameV = currentFrame + mFrameVOffset;
238
239 const int size = std::min(mFrameWidth, mFrameHeight) / 10;
240 bool black = true;
241
242 if (size == 0) {
243 // When this happens, it happens at a very high rate,
244 // so don't log any messages and just return.
245 return;
246 }
247
248 mCheckX += kCheckXSpeed * elapsed;
249 mCheckY += kCheckYSpeed * elapsed;
250
251 // Allow the X and Y values to transition across two checkerboard boxes
252 // before resetting it back. This allows for the gray to black transition.
253 // Note that this is in screen size independent coordinates so that frames
254 // will look similar regardless of resolution
255 if (mCheckX > 2.0) {
256 mCheckX -= 2.0;
257 }
258 if (mCheckY > 2.0) {
259 mCheckY -= 2.0;
260 }
261
262 // Are we in the gray or black zone?
263 if (mCheckX >= 1.0)
264 black = false;
265 if (mCheckY >= 1.0)
266 black = !black;
267
268 int county = static_cast<int>(mCheckY * size) % size;
269 int checkxremainder = static_cast<int>(mCheckX * size) % size;
270
271 YUVPixel adjustedWhite = YUVPixel(mWhiteYUV);
272 changeWhiteBalance(adjustedWhite.Y, adjustedWhite.U, adjustedWhite.V);
273 adjustedWhite.Y = changeExposure(adjustedWhite.Y);
274 YUVPixel adjustedBlack = YUVPixel(mBlackYUV);
275 adjustedBlack.Y = changeExposure(adjustedBlack.Y);
276
277 for(int y = 0; y < mFrameHeight; y++) {
278 int countx = checkxremainder;
279 bool current = black;
280 uint8_t* Y = currentFrame + mYStride * y;
281 uint8_t* U = frameU + mUVStride * (y / 2);
282 uint8_t* V = frameV + mUVStride * (y / 2);
283 for(int x = 0; x < mFrameWidth; x += 2) {
284 if (current) {
285 adjustedBlack.get(Y, U, V);
286 } else {
287 adjustedWhite.get(Y, U, V);
288 }
289 Y[1] = *Y;
290 Y += 2; U += mUVStep; V += mUVStep;
291 countx += 2;
292 if(countx >= size) {
293 countx = 0;
294 current = !current;
295 }
296 }
297 if(county++ >= size) {
298 county = 0;
299 black = !black;
300 }
301 }
302
303 /* Run the square. */
304 const int squareSize = std::min(mFrameWidth, mFrameHeight) / 4;
305 mSquareX += mSquareXSpeed * elapsed;
306 mSquareY += mSquareYSpeed * elapsed;
307 int squareX = mSquareX * mFrameWidth;
308 int squareY = mSquareY * mFrameHeight;
309 if (squareX + squareSize > mFrameWidth) {
310 mSquareXSpeed = -mSquareXSpeed;
311 double relativeWidth = static_cast<double>(squareSize) / mFrameWidth;
312 mSquareX -= 2.0 * (mSquareX + relativeWidth - 1.0);
313 squareX = mSquareX * mFrameWidth;
314 } else if (squareX < 0) {
315 mSquareXSpeed = -mSquareXSpeed;
316 mSquareX = -mSquareX;
317 squareX = mSquareX * mFrameWidth;
318 }
319 if (squareY + squareSize > mFrameHeight) {
320 mSquareYSpeed = -mSquareYSpeed;
321 double relativeHeight = static_cast<double>(squareSize) / mFrameHeight;
322 mSquareY -= 2.0 * (mSquareY + relativeHeight - 1.0);
323 squareY = mSquareY * mFrameHeight;
324 } else if (squareY < 0) {
325 mSquareYSpeed = -mSquareYSpeed;
326 mSquareY = -mSquareY;
327 squareY = mSquareY * mFrameHeight;
328 }
329
330 if (now - mLastColorChange > kSquareColorChangeIntervalNs) {
331 mLastColorChange = now;
332 mSquareColor = mSquareColor == &mRedYUV ? &mGreenYUV : &mRedYUV;
333 }
334
335 drawSquare(buffer, squareX, squareY, squareSize, mSquareColor);
336 mLastRedrawn = now;
337 }
338
drawSquare(void * buffer,int x,int y,int size,const YUVPixel * color)339 void EmulatedFakeCameraDevice::drawSquare(void* buffer,
340 int x,
341 int y,
342 int size,
343 const YUVPixel* color)
344 {
345 uint8_t* currentFrame = reinterpret_cast<uint8_t*>(buffer);
346 uint8_t* frameU = currentFrame + mFrameUOffset;
347 uint8_t* frameV = currentFrame + mFrameVOffset;
348
349 const int square_xstop = std::min(mFrameWidth, x + size);
350 const int square_ystop = std::min(mFrameHeight, y + size);
351 uint8_t* Y_pos = currentFrame + y * mYStride + x;
352
353 YUVPixel adjustedColor = *color;
354 changeWhiteBalance(adjustedColor.Y, adjustedColor.U, adjustedColor.V);
355
356 // Draw the square.
357 for (; y < square_ystop; y++) {
358 const int iUV = (y / 2) * mUVStride + (x / 2) * mUVStep;
359 uint8_t* sqU = frameU + iUV;
360 uint8_t* sqV = frameV + iUV;
361 uint8_t* sqY = Y_pos;
362 for (int i = x; i < square_xstop; i += 2) {
363 adjustedColor.get(sqY, sqU, sqV);
364 *sqY = changeExposure(*sqY);
365 sqY[1] = *sqY;
366 sqY += 2; sqU += mUVStep; sqV += mUVStep;
367 }
368 Y_pos += mYStride;
369 }
370 }
371
372 #if EFCD_ROTATE_FRAME
373
drawSolid(void * buffer,YUVPixel * color)374 void EmulatedFakeCameraDevice::drawSolid(void* buffer, YUVPixel* color)
375 {
376 YUVPixel adjustedColor = *color;
377 changeWhiteBalance(adjustedColor.Y, adjustedColor.U, adjustedColor.V);
378
379 /* All Ys are the same, will fill any alignment padding but that's OK */
380 memset(mCurrentFrame, changeExposure(adjustedColor.Y),
381 mFrameHeight * mYStride);
382
383 /* Fill U, and V panes. */
384 for (int y = 0; y < mFrameHeight / 2; ++y) {
385 uint8_t* U = mFrameU + y * mUVStride;
386 uint8_t* V = mFrameV + y * mUVStride;
387
388 for (int x = 0; x < mFrameWidth / 2; ++x, U += mUVStep, V += mUVStep) {
389 *U = color->U;
390 *V = color->V;
391 }
392 }
393 }
394
drawStripes(void * buffer)395 void EmulatedFakeCameraDevice::drawStripes(void* buffer)
396 {
397 /* Divide frame into 4 stripes. */
398 const int change_color_at = mFrameHeight / 4;
399 const int each_in_row = mUVInRow / mUVStep;
400 uint8_t* pY = mCurrentFrame;
401 for (int y = 0; y < mFrameHeight; y++, pY += mYStride) {
402 /* Select the color. */
403 YUVPixel* color;
404 const int color_index = y / change_color_at;
405 if (color_index == 0) {
406 /* White stripe on top. */
407 color = &mWhiteYUV;
408 } else if (color_index == 1) {
409 /* Then the red stripe. */
410 color = &mRedYUV;
411 } else if (color_index == 2) {
412 /* Then the green stripe. */
413 color = &mGreenYUV;
414 } else {
415 /* And the blue stripe at the bottom. */
416 color = &mBlueYUV;
417 }
418 changeWhiteBalance(color->Y, color->U, color->V);
419
420 /* All Ys at the row are the same. */
421 memset(pY, changeExposure(color->Y), mFrameWidth);
422
423 /* Offset of the current row inside U/V panes. */
424 const int uv_off = (y / 2) * mUVStride;
425 /* Fill U, and V panes. */
426 uint8_t* U = mFrameU + uv_off;
427 uint8_t* V = mFrameV + uv_off;
428 for (int k = 0; k < each_in_row; k++, U += mUVStep, V += mUVStep) {
429 *U = color->U;
430 *V = color->V;
431 }
432 }
433 }
434
rotateFrame()435 int EmulatedFakeCameraDevice::rotateFrame()
436 {
437 if ((systemTime(SYSTEM_TIME_MONOTONIC) - mLastRotatedAt) >= mRotateFreq) {
438 mLastRotatedAt = systemTime(SYSTEM_TIME_MONOTONIC);
439 mCurrentFrameType++;
440 if (mCurrentFrameType > 2) {
441 mCurrentFrameType = 0;
442 }
443 if (mCurrentFrameType == 2) {
444 ALOGD("********** Rotated to the SOLID COLOR frame **********");
445 /* Solid color: lets rotate color too. */
446 if (mCurrentColor == &mWhiteYUV) {
447 ALOGD("----- Painting a solid RED frame -----");
448 mCurrentColor = &mRedYUV;
449 } else if (mCurrentColor == &mRedYUV) {
450 ALOGD("----- Painting a solid GREEN frame -----");
451 mCurrentColor = &mGreenYUV;
452 } else if (mCurrentColor == &mGreenYUV) {
453 ALOGD("----- Painting a solid BLUE frame -----");
454 mCurrentColor = &mBlueYUV;
455 } else {
456 /* Back to white. */
457 ALOGD("----- Painting a solid WHITE frame -----");
458 mCurrentColor = &mWhiteYUV;
459 }
460 } else if (mCurrentFrameType == 0) {
461 ALOGD("********** Rotated to the CHECKERBOARD frame **********");
462 } else if (mCurrentFrameType == 1) {
463 ALOGD("********** Rotated to the STRIPED frame **********");
464 }
465 }
466
467 return mCurrentFrameType;
468 }
469
470 #endif // EFCD_ROTATE_FRAME
471
472 }; /* namespace android */
473