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path: root/v3/EmulatedFakeCameraDevice.cpp (plain)
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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
28namespace android {
29
30EmulatedFakeCameraDevice::EmulatedFakeCameraDevice(EmulatedFakeCamera* camera_hal)
31 : EmulatedCameraDevice(camera_hal),
32 mBlackYUV(kBlack32),
33 mWhiteYUV(kWhite32),
34 mRedYUV(kRed8),
35 mGreenYUV(kGreen8),
36 mBlueYUV(kBlue8),
37 mLastRedrawn(0),
38 mCheckX(0),
39 mCheckY(0),
40 mCcounter(0)
41#if EFCD_ROTATE_FRAME
42 , mLastRotatedAt(0),
43 mCurrentFrameType(0),
44 mCurrentColor(&mWhiteYUV)
45#endif // EFCD_ROTATE_FRAME
46{
47 // Makes the image with the original exposure compensation darker.
48 // So the effects of changing the exposure compensation can be seen.
49 mBlackYUV.Y = mBlackYUV.Y / 2;
50 mWhiteYUV.Y = mWhiteYUV.Y / 2;
51 mRedYUV.Y = mRedYUV.Y / 2;
52 mGreenYUV.Y = mGreenYUV.Y / 2;
53 mBlueYUV.Y = mBlueYUV.Y / 2;
54}
55
56EmulatedFakeCameraDevice::~EmulatedFakeCameraDevice()
57{
58}
59
60/****************************************************************************
61 * Emulated camera device abstract interface implementation.
62 ***************************************************************************/
63
64status_t EmulatedFakeCameraDevice::connectDevice()
65{
66 ALOGV("%s", __FUNCTION__);
67
68 Mutex::Autolock locker(&mObjectLock);
69 if (!isInitialized()) {
70 ALOGE("%s: Fake camera device is not initialized.", __FUNCTION__);
71 return EINVAL;
72 }
73 if (isConnected()) {
74 ALOGW("%s: Fake camera device is already connected.", __FUNCTION__);
75 return NO_ERROR;
76 }
77
78 /* There is no device to connect to. */
79 mState = ECDS_CONNECTED;
80
81 return NO_ERROR;
82}
83
84status_t EmulatedFakeCameraDevice::disconnectDevice()
85{
86 ALOGV("%s", __FUNCTION__);
87
88 Mutex::Autolock locker(&mObjectLock);
89 if (!isConnected()) {
90 ALOGW("%s: Fake camera device is already disconnected.", __FUNCTION__);
91 return NO_ERROR;
92 }
93 if (isStarted()) {
94 ALOGE("%s: Cannot disconnect from the started device.", __FUNCTION__);
95 return EINVAL;
96 }
97
98 /* There is no device to disconnect from. */
99 mState = ECDS_INITIALIZED;
100
101 return NO_ERROR;
102}
103
104status_t EmulatedFakeCameraDevice::startDevice(int width,
105 int height,
106 uint32_t pix_fmt)
107{
108 ALOGV("%s", __FUNCTION__);
109
110 Mutex::Autolock locker(&mObjectLock);
111 if (!isConnected()) {
112 ALOGE("%s: Fake camera device is not connected.", __FUNCTION__);
113 return EINVAL;
114 }
115 if (isStarted()) {
116 ALOGE("%s: Fake camera device is already started.", __FUNCTION__);
117 return EINVAL;
118 }
119
120 /* Initialize the base class. */
121 const status_t res =
122 EmulatedCameraDevice::commonStartDevice(width, height, pix_fmt);
123 if (res == NO_ERROR) {
124 /* Calculate U/V panes inside the framebuffer. */
125 switch (mPixelFormat) {
126 case V4L2_PIX_FMT_YVU420:
127 mFrameV = mCurrentFrame + mTotalPixels;
128 mFrameU = mFrameU + mTotalPixels / 4;
129 mUVStep = 1;
130 mUVTotalNum = mTotalPixels / 4;
131 break;
132
133 case V4L2_PIX_FMT_YUV420:
134 mFrameU = mCurrentFrame + mTotalPixels;
135 mFrameV = mFrameU + mTotalPixels / 4;
136 mUVStep = 1;
137 mUVTotalNum = mTotalPixels / 4;
138 break;
139
140 case V4L2_PIX_FMT_NV21:
141 /* Interleaved UV pane, V first. */
142 mFrameV = mCurrentFrame + mTotalPixels;
143 mFrameU = mFrameV + 1;
144 mUVStep = 2;
145 mUVTotalNum = mTotalPixels / 4;
146 break;
147
148 case V4L2_PIX_FMT_NV12:
149 /* Interleaved UV pane, U first. */
150 mFrameU = mCurrentFrame + mTotalPixels;
151 mFrameV = mFrameU + 1;
152 mUVStep = 2;
153 mUVTotalNum = mTotalPixels / 4;
154 break;
155
156 default:
157 ALOGE("%s: Unknown pixel format %.4s", __FUNCTION__,
158 reinterpret_cast<const char*>(&mPixelFormat));
159 return EINVAL;
160 }
161 /* Number of items in a single row inside U/V panes. */
162 mUVInRow = (width / 2) * mUVStep;
163 mState = ECDS_STARTED;
164 } else {
165 ALOGE("%s: commonStartDevice failed", __FUNCTION__);
166 }
167
168 return res;
169}
170
171status_t EmulatedFakeCameraDevice::stopDevice()
172{
173 ALOGV("%s", __FUNCTION__);
174
175 Mutex::Autolock locker(&mObjectLock);
176 if (!isStarted()) {
177 ALOGW("%s: Fake camera device is not started.", __FUNCTION__);
178 return NO_ERROR;
179 }
180
181 mFrameU = mFrameV = NULL;
182 EmulatedCameraDevice::commonStopDevice();
183 mState = ECDS_CONNECTED;
184
185 return NO_ERROR;
186}
187
188/****************************************************************************
189 * Worker thread management overrides.
190 ***************************************************************************/
191
192bool EmulatedFakeCameraDevice::inWorkerThread()
193{
194 /* Wait till FPS timeout expires, or thread exit message is received. */
195 WorkerThread::SelectRes res =
196 getWorkerThread()->Select(-1, 1000000 / mEmulatedFPS);
197 if (res == WorkerThread::EXIT_THREAD) {
198 ALOGV("%s: Worker thread has been terminated.", __FUNCTION__);
199 return false;
200 }
201
202 /* Lets see if we need to generate a new frame. */
203 if ((systemTime(SYSTEM_TIME_MONOTONIC) - mLastRedrawn) >= mRedrawAfter) {
204 /*
205 * Time to generate a new frame.
206 */
207
208#if EFCD_ROTATE_FRAME
209 const int frame_type = rotateFrame();
210 switch (frame_type) {
211 case 0:
212 drawCheckerboard();
213 break;
214 case 1:
215 drawStripes();
216 break;
217 case 2:
218 drawSolid(mCurrentColor);
219 break;
220 }
221#else
222 /* Draw the checker board. */
223 drawCheckerboard();
224
225#endif // EFCD_ROTATE_FRAME
226
227 mLastRedrawn = systemTime(SYSTEM_TIME_MONOTONIC);
228 }
229
230 /* Timestamp the current frame, and notify the camera HAL about new frame. */
231 mCurFrameTimestamp = systemTime(SYSTEM_TIME_MONOTONIC);
232 mCameraHAL->onNextFrameAvailable(mCurrentFrame, mCurFrameTimestamp, this);
233
234 return true;
235}
236
237/****************************************************************************
238 * Fake camera device private API
239 ***************************************************************************/
240
241void EmulatedFakeCameraDevice::drawCheckerboard()
242{
243 const int size = mFrameWidth / 10;
244 bool black = true;
245
246 if (size == 0) {
247 // When this happens, it happens at a very high rate,
248 // so don't log any messages and just return.
249 return;
250 }
251
252
253 if((mCheckX / size) & 1)
254 black = false;
255 if((mCheckY / size) & 1)
256 black = !black;
257
258 int county = mCheckY % size;
259 int checkxremainder = mCheckX % size;
260 uint8_t* Y = mCurrentFrame;
261 uint8_t* U_pos = mFrameU;
262 uint8_t* V_pos = mFrameV;
263 uint8_t* U = U_pos;
264 uint8_t* V = V_pos;
265
266 YUVPixel adjustedWhite = YUVPixel(mWhiteYUV);
267 changeWhiteBalance(adjustedWhite.Y, adjustedWhite.U, adjustedWhite.V);
268
269 for(int y = 0; y < mFrameHeight; y++) {
270 int countx = checkxremainder;
271 bool current = black;
272 for(int x = 0; x < mFrameWidth; x += 2) {
273 if (current) {
274 mBlackYUV.get(Y, U, V);
275 } else {
276 adjustedWhite.get(Y, U, V);
277 }
278 *Y = changeExposure(*Y);
279 Y[1] = *Y;
280 Y += 2; U += mUVStep; V += mUVStep;
281 countx += 2;
282 if(countx >= size) {
283 countx = 0;
284 current = !current;
285 }
286 }
287 if (y & 0x1) {
288 U_pos = U;
289 V_pos = V;
290 } else {
291 U = U_pos;
292 V = V_pos;
293 }
294 if(county++ >= size) {
295 county = 0;
296 black = !black;
297 }
298 }
299 mCheckX += 3;
300 mCheckY++;
301
302 /* Run the square. */
303 int sqx = ((mCcounter * 3) & 255);
304 if(sqx > 128) sqx = 255 - sqx;
305 int sqy = ((mCcounter * 5) & 255);
306 if(sqy > 128) sqy = 255 - sqy;
307 const int sqsize = mFrameWidth / 10;
308 drawSquare(sqx * sqsize / 32, sqy * sqsize / 32, (sqsize * 5) >> 1,
309 (mCcounter & 0x100) ? &mRedYUV : &mGreenYUV);
310 mCcounter++;
311}
312
313void EmulatedFakeCameraDevice::drawSquare(int x,
314 int y,
315 int size,
316 const YUVPixel* color)
317{
318 const int square_xstop = min(mFrameWidth, x + size);
319 const int square_ystop = min(mFrameHeight, y + size);
320 uint8_t* Y_pos = mCurrentFrame + y * mFrameWidth + x;
321
322 YUVPixel adjustedColor = *color;
323 changeWhiteBalance(adjustedColor.Y, adjustedColor.U, adjustedColor.V);
324
325 // Draw the square.
326 for (; y < square_ystop; y++) {
327 const int iUV = (y / 2) * mUVInRow + (x / 2) * mUVStep;
328 uint8_t* sqU = mFrameU + iUV;
329 uint8_t* sqV = mFrameV + iUV;
330 uint8_t* sqY = Y_pos;
331 for (int i = x; i < square_xstop; i += 2) {
332 adjustedColor.get(sqY, sqU, sqV);
333 *sqY = changeExposure(*sqY);
334 sqY[1] = *sqY;
335 sqY += 2; sqU += mUVStep; sqV += mUVStep;
336 }
337 Y_pos += mFrameWidth;
338 }
339}
340
341#if EFCD_ROTATE_FRAME
342
343void EmulatedFakeCameraDevice::drawSolid(YUVPixel* color)
344{
345 YUVPixel adjustedColor = *color;
346 changeWhiteBalance(adjustedColor.Y, adjustedColor.U, adjustedColor.V);
347
348 /* All Ys are the same. */
349 memset(mCurrentFrame, changeExposure(adjustedColor.Y), mTotalPixels);
350
351 /* Fill U, and V panes. */
352 uint8_t* U = mFrameU;
353 uint8_t* V = mFrameV;
354 for (int k = 0; k < mUVTotalNum; k++, U += mUVStep, V += mUVStep) {
355 *U = color->U;
356 *V = color->V;
357 }
358}
359
360void EmulatedFakeCameraDevice::drawStripes()
361{
362 /* Divide frame into 4 stripes. */
363 const int change_color_at = mFrameHeight / 4;
364 const int each_in_row = mUVInRow / mUVStep;
365 uint8_t* pY = mCurrentFrame;
366 for (int y = 0; y < mFrameHeight; y++, pY += mFrameWidth) {
367 /* Select the color. */
368 YUVPixel* color;
369 const int color_index = y / change_color_at;
370 if (color_index == 0) {
371 /* White stripe on top. */
372 color = &mWhiteYUV;
373 } else if (color_index == 1) {
374 /* Then the red stripe. */
375 color = &mRedYUV;
376 } else if (color_index == 2) {
377 /* Then the green stripe. */
378 color = &mGreenYUV;
379 } else {
380 /* And the blue stripe at the bottom. */
381 color = &mBlueYUV;
382 }
383 changeWhiteBalance(color->Y, color->U, color->V);
384
385 /* All Ys at the row are the same. */
386 memset(pY, changeExposure(color->Y), mFrameWidth);
387
388 /* Offset of the current row inside U/V panes. */
389 const int uv_off = (y / 2) * mUVInRow;
390 /* Fill U, and V panes. */
391 uint8_t* U = mFrameU + uv_off;
392 uint8_t* V = mFrameV + uv_off;
393 for (int k = 0; k < each_in_row; k++, U += mUVStep, V += mUVStep) {
394 *U = color->U;
395 *V = color->V;
396 }
397 }
398}
399
400int EmulatedFakeCameraDevice::rotateFrame()
401{
402 if ((systemTime(SYSTEM_TIME_MONOTONIC) - mLastRotatedAt) >= mRotateFreq) {
403 mLastRotatedAt = systemTime(SYSTEM_TIME_MONOTONIC);
404 mCurrentFrameType++;
405 if (mCurrentFrameType > 2) {
406 mCurrentFrameType = 0;
407 }
408 if (mCurrentFrameType == 2) {
409 ALOGD("********** Rotated to the SOLID COLOR frame **********");
410 /* Solid color: lets rotate color too. */
411 if (mCurrentColor == &mWhiteYUV) {
412 ALOGD("----- Painting a solid RED frame -----");
413 mCurrentColor = &mRedYUV;
414 } else if (mCurrentColor == &mRedYUV) {
415 ALOGD("----- Painting a solid GREEN frame -----");
416 mCurrentColor = &mGreenYUV;
417 } else if (mCurrentColor == &mGreenYUV) {
418 ALOGD("----- Painting a solid BLUE frame -----");
419 mCurrentColor = &mBlueYUV;
420 } else {
421 /* Back to white. */
422 ALOGD("----- Painting a solid WHITE frame -----");
423 mCurrentColor = &mWhiteYUV;
424 }
425 } else if (mCurrentFrameType == 0) {
426 ALOGD("********** Rotated to the CHECKERBOARD frame **********");
427 } else if (mCurrentFrameType == 1) {
428 ALOGD("********** Rotated to the STRIPED frame **********");
429 }
430 }
431
432 return mCurrentFrameType;
433}
434
435#endif // EFCD_ROTATE_FRAME
436
437}; /* namespace android */
438
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