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Adjust capture rate to better match display

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ns6089
2023-08-26 17:27:36 +03:00
committed by Cameron Gutman
parent 6683ea2ac1
commit b494d06f89
1 changed files with 22 additions and 1 deletions
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23
src/platform/windows/display_base.cpp
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@@ -120,7 +120,28 @@ namespace platf::dxgi {
capture_e
display_base_t::capture(const push_captured_image_cb_t &push_captured_image_cb, const pull_free_image_cb_t &pull_free_image_cb, bool *cursor) {
const auto client_frame_interval = std::chrono::nanoseconds { 1s } / client_frame_rate;
auto calculate_client_frame_interval = [&]() -> std::chrono::nanoseconds {
double display_frame_rate = (double) display_refresh_rate.Numerator / display_refresh_rate.Denominator;
double client_frame_rate_adjusted;
if (client_frame_rate >= display_frame_rate) {
client_frame_rate_adjusted = display_frame_rate * std::round(client_frame_rate / display_frame_rate);
}
else {
client_frame_rate_adjusted = display_frame_rate / std::round(display_frame_rate / client_frame_rate);
}
// Adjust capture frame interval when display refresh rate is not integral but very close to requested fps.
// Can only decrease requested fps, otherwise client may start accumulating frames and suffer increased latency.
if (client_frame_rate > client_frame_rate_adjusted && client_frame_rate_adjusted / client_frame_rate > 0.99) {
BOOST_LOG(info) << "Adjusted capture rate to " << client_frame_rate_adjusted << "fps to better match display";
return std::chrono::nanoseconds(std::llround(std::nano::den / client_frame_rate_adjusted));
}
return std::chrono::nanoseconds(1s) / client_frame_rate;
};
const auto client_frame_interval = calculate_client_frame_interval();
std::optional<std::chrono::steady_clock::time_point> next_frame_time;
// Keep the display awake during capture. If the display goes to sleep during