54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
#include <opencv2/videoio.hpp>
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#include <chrono>
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#include <algorithm>
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#include <numeric>
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#include <vector>
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#include <cstdio>
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static void bench(const char* name, int device, int backend, int W, int H, int frames) {
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cv::VideoCapture cap(device, backend);
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if (!cap.isOpened()) {
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std::printf("%-12s failed to open /dev/video%d\n", name, device);
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return;
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}
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cap.set(cv::CAP_PROP_FRAME_WIDTH, W);
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cap.set(cv::CAP_PROP_FRAME_HEIGHT, H);
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// Warm up
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for (int i = 0; i < 5; ++i) cap.grab();
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std::vector<double> times;
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times.reserve(frames);
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for (int i = 0; i < frames; ++i) {
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auto t0 = std::chrono::steady_clock::now();
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bool ok = cap.grab();
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double ms = std::chrono::duration<double, std::milli>(
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std::chrono::steady_clock::now() - t0).count();
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if (ok) times.push_back(ms);
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}
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cap.release();
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if (times.empty()) {
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std::printf("%-12s no frames captured\n", name);
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return;
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}
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std::sort(times.begin(), times.end());
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double avg = std::accumulate(times.begin(), times.end(), 0.0) / times.size();
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double mn = times.front();
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double mx = times.back();
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double p95 = times[times.size() * 95 / 100];
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std::printf("%-12s avg=%6.1fms min=%5.1fms p95=%6.1fms max=%6.1fms (%zu frames)\n",
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name, avg, mn, p95, mx, times.size());
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}
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int main(int argc, char** argv) {
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int device = argc > 1 ? std::atoi(argv[1]) : 0;
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int frames = argc > 2 ? std::atoi(argv[2]) : 60;
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int W = 1920, H = 1080;
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std::printf("Benchmarking /dev/video%d at %dx%d, %d frames each\n\n", device, W, H, frames);
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bench("V4L2", device, cv::CAP_V4L2, W, H, frames);
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bench("GStreamer", device, cv::CAP_GSTREAMER, W, H, frames);
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return 0;
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}
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