1 /*
2 * Copyright (C) 2018 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 <fcntl.h>
18 #include <log/log.h>
19 #include <pthread.h>
20 #include <sys/epoll.h>
21 #include <sys/prctl.h>
22 #include <sys/stat.h>
23 #include <sys/types.h>
24 #include <unistd.h>
25 #include <chrono>
26 #include <ctime>
27 #include <fstream>
28 #include <iomanip>
29 #include <memory>
30 #include <sstream>
31 #include <tuple>
32 #include <unordered_map>
33 #include <vector>
34
35 #include <drm/msm_drm.h>
36 #include <drm/msm_drm_pp.h>
37 #include <xf86drm.h>
38 #include <xf86drmMode.h>
39
40 #include "histogram_collector.h"
41 #include "ringbuffer.h"
42
43 constexpr static auto implementation_defined_max_frame_ringbuffer = 300;
44
HistogramCollector()45 histogram::HistogramCollector::HistogramCollector()
46 : histogram(histogram::Ringbuffer::create(implementation_defined_max_frame_ringbuffer,
47 std::make_unique<histogram::DefaultTimeKeeper>())) {}
48
~HistogramCollector()49 histogram::HistogramCollector::~HistogramCollector() {
50 stop();
51 }
52
53 namespace {
54 static constexpr size_t numBuckets = 8;
55 static_assert((HIST_V_SIZE % numBuckets) == 0,
56 "histogram cannot be rebucketed to smaller number of buckets");
57 static constexpr int bucket_compression = HIST_V_SIZE / numBuckets;
58
rebucketTo8Buckets(std::array<uint64_t,HIST_V_SIZE> const & frame)59 std::array<uint64_t, numBuckets> rebucketTo8Buckets(
60 std::array<uint64_t, HIST_V_SIZE> const &frame) {
61 std::array<uint64_t, numBuckets> bins;
62 bins.fill(0);
63 for (auto i = 0u; i < HIST_V_SIZE; i++)
64 bins[i / bucket_compression] += frame[i];
65 return bins;
66 }
67 } // namespace
68
Dump() const69 std::string histogram::HistogramCollector::Dump() const {
70 uint64_t num_frames = 0;
71 std::array<uint64_t, HIST_V_SIZE> all_sample_buckets;
72 std::tie(num_frames, all_sample_buckets) = histogram->collect_cumulative();
73 std::array<uint64_t, numBuckets> samples = rebucketTo8Buckets(all_sample_buckets);
74
75 std::stringstream ss;
76 ss << "Color Sampling, dark (0.0) to light (1.0): sampled frames: " << num_frames << '\n';
77 if (num_frames == 0) {
78 ss << "\tno color statistics collected\n";
79 return ss.str();
80 }
81
82 ss << std::fixed << std::setprecision(3);
83 ss << "\tbucket\t\t: # of displayed pixels at bucket value\n";
84 for (auto i = 0u; i < samples.size(); i++) {
85 ss << "\t" << i / static_cast<float>(samples.size()) << " to "
86 << (i + 1) / static_cast<float>(samples.size()) << "\t: " << samples[i] << '\n';
87 }
88
89 return ss.str();
90 }
91
collect(uint64_t max_frames,uint64_t timestamp,int32_t out_samples_size[NUM_HISTOGRAM_COLOR_COMPONENTS],uint64_t * out_samples[NUM_HISTOGRAM_COLOR_COMPONENTS],uint64_t * out_num_frames) const92 HWC2::Error histogram::HistogramCollector::collect(
93 uint64_t max_frames, uint64_t timestamp,
94 int32_t out_samples_size[NUM_HISTOGRAM_COLOR_COMPONENTS],
95 uint64_t *out_samples[NUM_HISTOGRAM_COLOR_COMPONENTS], uint64_t *out_num_frames) const {
96 if (!out_samples_size || !out_num_frames)
97 return HWC2::Error::BadParameter;
98
99 out_samples_size[0] = 0;
100 out_samples_size[1] = 0;
101 out_samples_size[2] = numBuckets;
102 out_samples_size[3] = 0;
103
104 uint64_t num_frames = 0;
105 std::array<uint64_t, HIST_V_SIZE> samples;
106
107 if (max_frames == 0 && timestamp == 0) {
108 std::tie(num_frames, samples) = histogram->collect_cumulative();
109 } else if (max_frames == 0) {
110 std::tie(num_frames, samples) = histogram->collect_after(timestamp);
111 } else if (timestamp == 0) {
112 std::tie(num_frames, samples) = histogram->collect_max(max_frames);
113 } else {
114 std::tie(num_frames, samples) = histogram->collect_max_after(timestamp, max_frames);
115 }
116
117 auto samples_rebucketed = rebucketTo8Buckets(samples);
118 *out_num_frames = num_frames;
119 if (out_samples && out_samples[2])
120 memcpy(out_samples[2], samples_rebucketed.data(), sizeof(uint64_t) * samples_rebucketed.size());
121
122 return HWC2::Error::None;
123 }
124
getAttributes(int32_t * format,int32_t * dataspace,uint8_t * supported_components) const125 HWC2::Error histogram::HistogramCollector::getAttributes(int32_t *format, int32_t *dataspace,
126 uint8_t *supported_components) const {
127 if (!format || !dataspace || !supported_components)
128 return HWC2::Error::BadParameter;
129
130 *format = HAL_PIXEL_FORMAT_HSV_888;
131 *dataspace = HAL_DATASPACE_UNKNOWN;
132 *supported_components = HWC2_FORMAT_COMPONENT_2;
133 return HWC2::Error::None;
134 }
135
start()136 void histogram::HistogramCollector::start() {
137 start(implementation_defined_max_frame_ringbuffer);
138 }
139
start(uint64_t max_frames)140 void histogram::HistogramCollector::start(uint64_t max_frames) {
141 std::unique_lock<decltype(mutex)> lk(mutex);
142 if (started) {
143 return;
144 }
145
146 started = true;
147 histogram =
148 histogram::Ringbuffer::create(max_frames, std::make_unique<histogram::DefaultTimeKeeper>());
149 monitoring_thread = std::thread(&HistogramCollector::blob_processing_thread, this);
150 }
151
stop()152 void histogram::HistogramCollector::stop() {
153 std::unique_lock<decltype(mutex)> lk(mutex);
154 if (!started) {
155 return;
156 }
157
158 started = false;
159 cv.notify_all();
160 lk.unlock();
161
162 if (monitoring_thread.joinable())
163 monitoring_thread.join();
164 }
165
notify_histogram_event(int blob_source_fd,BlobId id)166 void histogram::HistogramCollector::notify_histogram_event(int blob_source_fd, BlobId id) {
167 std::unique_lock<decltype(mutex)> lk(mutex);
168 if (!started) {
169 ALOGW("Discarding event blob-id: %X", id);
170 return;
171 }
172 if (work_available) {
173 ALOGI("notified of histogram event before consuming last one. prior event discarded");
174 }
175
176 work_available = true;
177 blobwork = HistogramCollector::BlobWork{blob_source_fd, id};
178 cv.notify_all();
179 }
180
blob_processing_thread()181 void histogram::HistogramCollector::blob_processing_thread() {
182 pthread_setname_np(pthread_self(), "histogram_blob");
183
184 std::unique_lock<decltype(mutex)> lk(mutex);
185
186 while (true) {
187 cv.wait(lk, [this] { return !started || work_available; });
188 if (!started) {
189 return;
190 }
191
192 auto work = blobwork;
193 work_available = false;
194 lk.unlock();
195
196 drmModePropertyBlobPtr blob = drmModeGetPropertyBlob(work.fd, work.id);
197 if (!blob || !blob->data) {
198 lk.lock();
199 continue;
200 }
201 histogram->insert(*static_cast<struct drm_msm_hist *>(blob->data));
202 drmModeFreePropertyBlob(blob);
203
204 lk.lock();
205 }
206 }
207