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1 /*
2  * Copyright (C) 2012 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 #include <gtest/gtest.h>
18 
19 #define LOG_TAG "CameraBurstTest"
20 //#define LOG_NDEBUG 0
21 #include <utils/Log.h>
22 
23 #include <cmath>
24 
25 #include "CameraStreamFixture.h"
26 #include "TestExtensions.h"
27 
28 #define CAMERA_FRAME_TIMEOUT    1000000000 //nsecs (1 secs)
29 #define CAMERA_HEAP_COUNT       2 //HALBUG: 1 means registerBuffers fails
30 #define CAMERA_BURST_DEBUGGING  0
31 #define CAMERA_FRAME_BURST_COUNT 10
32 
33 /* constants for the exposure test */
34 #define CAMERA_EXPOSURE_DOUBLE  2
35 #define CAMERA_EXPOSURE_DOUBLING_THRESHOLD 1.0f
36 #define CAMERA_EXPOSURE_DOUBLING_COUNT 4
37 #define CAMERA_EXPOSURE_FORMAT HAL_PIXEL_FORMAT_YCrCb_420_SP
38 #define CAMERA_EXPOSURE_STARTING 100000 // 1/10ms, up to 51.2ms with 10 steps
39 
40 #if CAMERA_BURST_DEBUGGING
41 #define dout std::cout
42 #else
43 #define dout if (0) std::cout
44 #endif
45 
46 using namespace android;
47 using namespace android::camera2;
48 
49 namespace android {
50 namespace camera2 {
51 namespace tests {
52 
53 static CameraStreamParams STREAM_PARAMETERS = {
54     /*mFormat*/     CAMERA_EXPOSURE_FORMAT,
55     /*mHeapCount*/  CAMERA_HEAP_COUNT
56 };
57 
58 class CameraBurstTest
59     : public ::testing::Test,
60       public CameraStreamFixture {
61 
62 public:
CameraBurstTest()63     CameraBurstTest() : CameraStreamFixture(STREAM_PARAMETERS) {
64         TEST_EXTENSION_FORKING_CONSTRUCTOR;
65 
66         if (HasFatalFailure()) {
67             return;
68         }
69 
70         CreateStream();
71     }
72 
~CameraBurstTest()73     ~CameraBurstTest() {
74         TEST_EXTENSION_FORKING_DESTRUCTOR;
75 
76         if (mDevice.get()) {
77             mDevice->waitUntilDrained();
78         }
79         DeleteStream();
80     }
81 
SetUp()82     virtual void SetUp() {
83         TEST_EXTENSION_FORKING_SET_UP;
84     }
TearDown()85     virtual void TearDown() {
86         TEST_EXTENSION_FORKING_TEAR_DOWN;
87     }
88 
89     /* this assumes the format is YUV420sp */
TotalBrightness(const CpuConsumer::LockedBuffer & imgBuffer,int * underexposed,int * overexposed) const90     long long TotalBrightness(const CpuConsumer::LockedBuffer& imgBuffer,
91                               int *underexposed,
92                               int *overexposed) const {
93 
94         const uint8_t* buf = imgBuffer.data;
95         size_t stride = imgBuffer.stride;
96 
97         /* iterate over the Y plane only */
98         long long acc = 0;
99 
100         *underexposed = 0;
101         *overexposed = 0;
102 
103         for (size_t y = 0; y < imgBuffer.height; ++y) {
104             for (size_t x = 0; x < imgBuffer.width; ++x) {
105                 const uint8_t p = buf[y * stride + x];
106 
107                 if (p == 0) {
108                     if (underexposed) {
109                         ++*underexposed;
110                     }
111                     continue;
112                 } else if (p == 255) {
113                     if (overexposed) {
114                         ++*overexposed;
115                     }
116                     continue;
117                 }
118 
119                 acc += p;
120             }
121         }
122 
123         return acc;
124     }
125 };
126 
TEST_F(CameraBurstTest,ManualExposureControl)127 TEST_F(CameraBurstTest, ManualExposureControl) {
128 
129     TEST_EXTENSION_FORKING_INIT;
130 
131     // Range of valid exposure times, in nanoseconds
132     int64_t minExp, maxExp;
133     {
134         camera_metadata_ro_entry exposureTimeRange =
135             GetStaticEntry(ANDROID_SENSOR_INFO_EXPOSURE_TIME_RANGE);
136 
137         ASSERT_EQ(2u, exposureTimeRange.count);
138         minExp = exposureTimeRange.data.i64[0];
139         maxExp = exposureTimeRange.data.i64[1];
140     }
141 
142     dout << "Min exposure is " << minExp;
143     dout << " max exposure is " << maxExp << std::endl;
144 
145     // Calculate some set of valid exposure times for each request
146     int64_t exposures[CAMERA_FRAME_BURST_COUNT];
147     exposures[0] = CAMERA_EXPOSURE_STARTING;
148     for (int i = 1; i < CAMERA_FRAME_BURST_COUNT; ++i) {
149         exposures[i] = exposures[i-1] * CAMERA_EXPOSURE_DOUBLE;
150     }
151     // Our calculated exposure times should be in [minExp, maxExp]
152     EXPECT_LE(minExp, exposures[0])
153         << "Minimum exposure range is too high, wanted at most "
154         << exposures[0] << "ns";
155     EXPECT_GE(maxExp, exposures[CAMERA_FRAME_BURST_COUNT-1])
156         << "Maximum exposure range is too low, wanted at least "
157         << exposures[CAMERA_FRAME_BURST_COUNT-1] << "ns";
158 
159     // Create a preview request, turning off all 3A
160     CameraMetadata previewRequest;
161     ASSERT_EQ(OK, mDevice->createDefaultRequest(CAMERA2_TEMPLATE_PREVIEW,
162                                                 &previewRequest));
163     {
164         Vector<uint8_t> outputStreamIds;
165         outputStreamIds.push(mStreamId);
166         ASSERT_EQ(OK, previewRequest.update(ANDROID_REQUEST_OUTPUT_STREAMS,
167                                             outputStreamIds));
168 
169         // Disable all 3A routines
170         uint8_t cmOff = static_cast<uint8_t>(ANDROID_CONTROL_MODE_OFF);
171         ASSERT_EQ(OK, previewRequest.update(ANDROID_CONTROL_MODE,
172                                             &cmOff, 1));
173         if (CAMERA_BURST_DEBUGGING) {
174             int frameCount = 0;
175             ASSERT_EQ(OK, previewRequest.update(ANDROID_REQUEST_FRAME_COUNT,
176                                                 &frameCount, 1));
177         }
178     }
179 
180     if (CAMERA_BURST_DEBUGGING) {
181         previewRequest.dump(STDOUT_FILENO);
182     }
183 
184     // Submit capture requests
185     for (int i = 0; i < CAMERA_FRAME_BURST_COUNT; ++i) {
186         CameraMetadata tmpRequest = previewRequest;
187         ASSERT_EQ(OK, tmpRequest.update(ANDROID_SENSOR_EXPOSURE_TIME,
188                                         &exposures[i], 1));
189         ALOGV("Submitting capture request %d with exposure %lld", i,
190             exposures[i]);
191         dout << "Capture request " << i << " exposure is "
192              << (exposures[i]/1e6f) << std::endl;
193         ASSERT_EQ(OK, mDevice->capture(tmpRequest));
194     }
195 
196     dout << "Buffer dimensions " << mWidth << "x" << mHeight << std::endl;
197 
198     float brightnesses[CAMERA_FRAME_BURST_COUNT];
199     // Get each frame (metadata) and then the buffer. Calculate brightness.
200     for (int i = 0; i < CAMERA_FRAME_BURST_COUNT; ++i) {
201         ALOGV("Reading capture request %d with exposure %lld", i, exposures[i]);
202         ASSERT_EQ(OK, mDevice->waitForNextFrame(CAMERA_FRAME_TIMEOUT));
203         ALOGV("Reading capture request-1 %d", i);
204         CameraMetadata frameMetadata;
205         ASSERT_EQ(OK, mDevice->getNextFrame(&frameMetadata));
206         ALOGV("Reading capture request-2 %d", i);
207 
208         ASSERT_EQ(OK, mFrameListener->waitForFrame(CAMERA_FRAME_TIMEOUT));
209         ALOGV("We got the frame now");
210 
211         CpuConsumer::LockedBuffer imgBuffer;
212         ASSERT_EQ(OK, mCpuConsumer->lockNextBuffer(&imgBuffer));
213 
214         int underexposed, overexposed;
215         long long brightness = TotalBrightness(imgBuffer, &underexposed,
216                                                &overexposed);
217         float avgBrightness = brightness * 1.0f /
218                               (mWidth * mHeight - (underexposed + overexposed));
219         ALOGV("Total brightness for frame %d was %lld (underexposed %d, "
220               "overexposed %d), avg %f", i, brightness, underexposed,
221               overexposed, avgBrightness);
222         dout << "Average brightness (frame " << i << ") was " << avgBrightness
223              << " (underexposed " << underexposed << ", overexposed "
224              << overexposed << ")" << std::endl;
225 
226         ASSERT_EQ(OK, mCpuConsumer->unlockBuffer(imgBuffer));
227 
228         brightnesses[i] = avgBrightness;
229     }
230 
231     // Calculate max consecutive frame exposure doubling
232     float prev = brightnesses[0];
233     int doubling_count = 1;
234     int max_doubling_count = 0;
235     for (int i = 1; i < CAMERA_FRAME_BURST_COUNT; ++i) {
236         if (fabs(brightnesses[i] - prev*CAMERA_EXPOSURE_DOUBLE)
237             <= CAMERA_EXPOSURE_DOUBLING_THRESHOLD) {
238             doubling_count++;
239         }
240         else {
241             max_doubling_count = std::max(max_doubling_count, doubling_count);
242             doubling_count = 1;
243         }
244         prev = brightnesses[i];
245     }
246 
247     dout << "max doubling count: " << max_doubling_count << std::endl;
248 
249     EXPECT_LE(CAMERA_EXPOSURE_DOUBLING_COUNT, max_doubling_count)
250       << "average brightness should double at least "
251       << CAMERA_EXPOSURE_DOUBLING_COUNT
252       << " times over each consecutive frame as the exposure is doubled";
253 }
254 
255 }
256 }
257 }
258 
259