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Server side of client-driven ("RDP-style") dynamic resolution: a client asks for a new stream resolution mid-session over the existing 0x5506 RESOLUTION control message, and the host switches the display mode so the stream follows. Closes#728.
Rebased onto current master. Upstream has since hardened this path itself (#909: VDD/cert/HDR routing and the single-video-session guard; LE payload decoding), so this PR now only adds the config switch, the capability, and safe apply semantics.
Capability via feature flag.platf::platform_caps::client_resolution_change (0x400) is set in the RTSP DESCRIBE x-ss-general.featureFlags, following the convention used by cursor shape, haptics and text context.
On the client side this is LI_FF_CLIENT_RESOLUTION_CHANGE. Clients can check it in LiGetHostFeatureFlags() before calling LiRequestResolutionChange(), without reading /serverinfo or knowing host settings.
The bit is computed per session from the same predicate the handler uses, stream::client_resolution_change_enabled(): allow_client_resolution_change && dynamic_resolution_follow_display && resolution_change = automatic && capture_target = display && the session launched with SOPS && Windows.
follow-display is required because the capture loop only resizes the encoder and sends 0x5507 when it follows the host display.
automatic resolution change is required because the capture loop keeps the launch-time client / display scale ratio for the whole stream, so client-requested sizes only come out exact when the launch mode was applied 1:1.
Window capture is excluded because it keeps the negotiated size and never follows the display, so a client-requested display size would never reach the stream.
Live display mode switching is only implemented on Windows; elsewhere configure_display is a no-op.
Request handling (handle_resolution_change), re-checking everything because the config can change after DESCRIBE:
Ignored if the shared predicate fails or the request comes from a control-only session (its stream isn't its own).
Ignored unless the capture loop encoded its display 1:1 when capture started. That is latched per session, because the loop keeps its start-time scale for the whole stream: a scaled session, such as a resume without a mode change, stays refused whatever its display shows later. Requests before capture starts are refused too.
Ignored while the capture display does not currently show the stream's size, in either orientation (checked with get_current_display_modes). A mismatch means the launch mode was not applied 1:1 or the host display changed underneath.
The size is rounded down to even and must be 256–16384 per dimension.
Requests that repeat the current size are ignored, and a 250 ms rate limit drops request storms (clients debounce too).
session->config.monitor, perf telemetry and the IDR are updated only when configure_display returns success. Before, they changed even when the reconfiguration was skipped (another session active, display gone) or failed, so a retry of the same size was wrongly treated as a no-op. deferred_retry counts as not applied, because since fix(display): 流活动中放弃延迟显示设置应用，防止采集管线楔死 #1055 the deferred retry skips display changes while a stream is active.
No intermediate display modes reach the client. A virtual-display size the VDD doesn't advertise yet makes upstream recreate the monitor (fix(windows): rebuild VDD monitors for dynamic modes #833), and it briefly comes up at its default mode (e.g. 3840x2160). The capture loop used to follow that intermediate mode, costing an extra 4K encoder init, an extra 0x5507 and an extra client decoder rebuild.
The handler now records the requested size in a per-session video::pending_display_size_t. Until the display reaches it, the capture loop doesn't follow other sizes; the stream keeps its current size through the scaler.
The target is dropped if the apply fails, if the mode actually applied differs, or after 10 s. After that the loop follows the current display once, so it can never freeze following. Only the 0x5506 path sets a target.
No monitor-size report for window capture. The capture loop no longer sends the stream-start 0x5507 report when capture_target = window. Window capture reads the monitor's size but keeps the negotiated size (no orientation swap, no display following), so that report described the monitor, not the stream: a client that applies the display-capture scale to it, e.g. on a portrait monitor, would reset its decoder to the wrong size. Display capture still reports at stream start and on every followed display change.
Unit tests for the predicate (including window capture), the stream-start report, size normalization and the pending-target logic (deferral, timeout, applied-mode mismatch, orientation, replacement) in tests/unit/test_stream.cpp and tests/unit/test_video.cpp.
End-to-end only with dynamic_resolution_follow_display on, resolution_change = automatic and display capture; the flag is advertised accordingly.
Arbitrary sizes depend on the display exposing the mode. On the VDD this goes through upstream's SETMODES and, if needed, the monitor-recreate path (fix(windows): rebuild VDD monitors for dynamic modes #833) mid-stream. On physical displays, sizes outside the EDID list fail with modes_fail and the stream keeps its current size.
Not advertised per-connection for multi-client cases. While another video session is active the request is skipped by the existing single-video-session guard. That state is transient, so it isn't baked into the DESCRIBE-time flag (a quick reconnect would otherwise lose the feature).
configure_display runs synchronously on the control thread, as it already did upstream. A mid-stream failure keeps upstream's launch-time cleanup behaviour, and a deferred_retry timer armed during a locked-desktop stream can outlive the stream. Fixing these needs a dedicated mid-stream reconfigure operation in display_device (follow-up).
Testing
Built with MSYS2 UCRT64 / gcc 16.1 (sunshine, test_sunshine). Full unit suite: 765 passed, 23 hardware-dependent skips, 0 failed, including the 5 ClientResolutionChangeTests.
Web UI: validate-i18n (19 locales), eslint, the web UI test suite (178/178) and the vite production build all pass.
Not yet runtime-tested: a live client resize smoke test on a physical display and on the VDD is still needed before merge.
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A resolution change can briefly lag behind the display, and an uncommon mode-query failure can prevent later resolution requests in that session. These bounded risks merit follow-up but do not block merging.
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Sunshine 核心 C++ 源码，自托管游戏串流服务器。审查要点：内存安全、 线程安全、RAII 资源管理、安全漏洞。注意预处理宏控制的平台相关代码。
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Actionable comments posted: 1
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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@src/stream.cpp`:
- Around line 1402-1407: The capability gate for client resolution changes in
the request handler is inconsistent with the capability declaration in
src/nvhttp.cpp. Currently, the code only checks allow_client_resolution_change,
but the capability declaration specifies that ClientResolutionChange requires
both allow_client_resolution_change AND dynamic_resolution_follow_display to be
enabled. Update the condition in the if statement (where
allow_client_resolution_change is checked) to also require
dynamic_resolution_follow_display to be true. Both config options must be
enabled for the resolution change to be processed; if either is disabled, log
the rejection and return early.
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Reviewing files that changed from the base of the PR and between 2f3442e and b999f21.
The serverinfo capability is advertised only when both allow_client_resolution_change and dynamic_resolution_follow_display are enabled, but the 0x5506 handler gated on the former alone. A client that ignores or caches the capability bit (or crafts the packet) could reach configure_display() with follow_display off, where the capture loop keeps the original stream resolution and never notifies the client -- a half-changed host state. Require both flags in the handler so it matches the advertised contract.
Addresses CodeRabbit review on AlkaidLab#729.
Good catch — fixed in b86e892. The handle_resolution_change gate now requires both allow_client_resolution_change && dynamic_resolution_follow_display, matching the ClientResolutionChange serverinfo advertisement in nvhttp.cpp. This closes the gap where a client ignoring/caching the capability bit (or crafting a 0x5506 packet) could reach configure_display() while follow_display is off — which would change the host display without the capture loop following or notifying the client.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/video.cpp:
- Around line 4689-4695: 更新 `stop_requested` 在 `display_change_deferred`
分支中的判断：捕获当前显示尺寸，并调用 `client_resolution_target` 的 `defers()`
重新评估；当目标与当前尺寸匹配、过期或被清除时应返回停止请求，保留其他延迟情况的行为。
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Reviewing files that changed from the base of the PR and between c34e583 and 966bbb2.
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src/stream.cpp
src/video.cpp
src/video.h
tests/unit/test_video.cpp
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Rebased on master. The only conflict was next to the new capture_target from #1188; kept both, they don't touch each other. Builds, ctest 40/40 including the new tests, lint:webui clean.
…utionChange
LiRequestResolutionChange() (qiin2333#48) sends 0x5506 RESOLUTION to any Sunshine
host with an encrypted control stream. Hosts that actually apply it can
now say so: LI_FF_CLIENT_RESOLUTION_CHANGE (0x400) in
LiGetHostFeatureFlags(), the bit Foundation Sunshine advertises
(AlkaidLab/foundation-sunshine#729). The flag is advisory; the sender is
unchanged, so existing callers keep working.
resolution-change-request-tests (static-library builds) drives the sender
over a loopback ENet connection with the encrypted control stream,
decrypts on the host side and checks the exact wire bytes and each
return code.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Small update after qiin2333/moonlight-common-c#48 / qiin2333/moonlight-vplus#780: allow_client_resolution_change now defaults to on. #780 already sends resolution requests without checking a host flag, so default-off would have turned its hot switch into a reconnect on updated hosts. Requests are still only applied when the result can be exact (follow-display, automatic resolution change, SOPS), and the switch can be turned off. ctest 40/40, lint:webui clean.
…utionChange
LiRequestResolutionChange() (qiin2333#48) sends 0x5506 RESOLUTION to any Sunshine
host with an encrypted control stream. Hosts that actually apply it can
now say so: LI_FF_CLIENT_RESOLUTION_CHANGE (0x400) in
LiGetHostFeatureFlags(), the bit Foundation Sunshine advertises
(AlkaidLab/foundation-sunshine#729). The flag is advisory; the sender is
unchanged, so existing callers keep working.
resolution-change-request-tests (static-library builds) drives the sender
over a loopback ENet connection with the encrypted control stream,
decrypts on the host side and checks the exact wire bytes and each
return code.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
…utionChange
LiRequestResolutionChange() (qiin2333#48) sends 0x5506 RESOLUTION to any Sunshine
host with an encrypted control stream. Hosts that actually apply it can
now say so: LI_FF_CLIENT_RESOLUTION_CHANGE (0x400) in
LiGetHostFeatureFlags(), the bit Foundation Sunshine advertises
(AlkaidLab/foundation-sunshine#729). The flag is advisory; the sender is
unchanged, so existing callers keep working.
resolution-change-request-tests (static-library builds) drives the sender
over a loopback ENet connection with the encrypted control stream,
decrypts on the host side and checks the exact wire bytes and each
return code.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
AsafMah
added a commit
to AsafMah/moonlight-common-c
that referenced
this pull request
Nov 11, 2026
…utionChange
LiRequestResolutionChange() (qiin2333#48) sends 0x5506 RESOLUTION to any Sunshine
host with an encrypted control stream. Hosts that actually apply it can
now say so: LI_FF_CLIENT_RESOLUTION_CHANGE (0x400) in
LiGetHostFeatureFlags(), the bit Foundation Sunshine advertises
(AlkaidLab/foundation-sunshine#729). The flag is advisory; the sender is
unchanged, so existing callers keep working.
resolution-change-request-tests (static-library builds) drives the sender
over a loopback ENet connection with the encrypted control stream,
decrypts on the host side and checks the exact wire bytes and each
return code.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
…on changes (AlkaidLab#728)
Clients can already send 0x5506 RESOLUTION; until now the host applied it
unconditionally and updated its state even when the display was not changed.
- Add video.allow_client_resolution_change (default off).
- Advertise the feature per session through the RTSP DESCRIBE featureFlags
bit platform_caps::client_resolution_change (0x400, common-c
LI_FF_CLIENT_RESOLUTION_CHANGE), so LiSendResolutionChangeRequest can gate
itself and clients need no host-specific checks.
- stream::client_resolution_change_enabled() backs both the flag and the
request handler: opt-in, dynamic_resolution_follow_display (the capture loop
only resizes the encoder and sends 0x5507 when following the display),
automatic resolution_change and SOPS (the capture loop keeps its launch-time
client/display scale ratio, so sizes are only exact when the launch mode was
applied 1:1). Windows only.
- The handler re-validates and also ignores requests from control-only
sessions and while the capture display does not show the stream's size
(non-1:1 launch or an external host display change).
- Round down to even and require 256..16384 per dimension; dedupe and drop
requests within 250 ms of the previous attempt.
- Update session->config.monitor, perf telemetry and raise the IDR only when
configure_display() succeeds. Previously they changed even when the
reconfiguration was skipped or failed, so retrying the same size became a
no-op. deferred_retry counts as not applied: since AlkaidLab#1055 the deferred retry
skips display changes while a stream is active.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: f2a3644b-5f57-4853-8ca6-c3730cc8e48a
Add the opt-in checkbox next to "Follow Host Display Resolution Mid-Stream"
with translated label and description in every locale.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: f2a3644b-5f57-4853-8ca6-c3730cc8e48a
…olution changes
A virtual-display size the VDD does not advertise yet makes configure_display
recreate the monitor, which briefly comes up at its default mode (3840x2160)
before the requested mode is applied. The capture loop followed that
intermediate mode: an extra 4K encoder init, an extra 0x5507 and an extra
client decoder rebuild before the real size (seen in the live smoke test).
The 0x5506 handler now records the requested size in a per-session
video::pending_display_size_t right before reconfiguring the display. Until
the capture display reaches it (same orientation), the capture loop does not
follow other sizes; the stream keeps its current size through the scaler.
The target is cleared when the apply fails, retargeted to the mode actually
applied, and expires after 10 s, after which the loop follows the current
display once via a new encode_run stop hook. The session state also records
the applied size. Only client-requested changes set a target.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: f2a3644b-5f57-4853-8ca6-c3730cc8e48a
Moonlight V+ (qiin2333/moonlight-vplus#780) already sends 0x5506
RESOLUTION through LiRequestResolutionChange() without checking a host
flag, and master applies it. Defaulting allow_client_resolution_change to
off would have turned its hot switch into a reconnect on every updated
host.
Default it to on: hosts keep applying requests (now only when the
preconditions for an exact result hold), advertise
LI_FF_CLIENT_RESOLUTION_CHANGE when they do, and users can still turn it
off to ignore client requests.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
The capture loop's stop condition while skipping a display change only
checked whether a client-resolution target was still pending. If the
capture thread saw the driver-rounded mode (e.g. 1464x910 for a 1462x910
request) before configure_display() returned, it skipped it; settle() then
retargeted to that exact size, but the display never changed again to
trigger a capture reinit, so the stream stayed at the old scaled size until
the 10 s deadline.
Extract the stop condition into video::make_deferred_display_stop() and
re-evaluate the skipped size with defers(): it turns true when the target
matches that size, expires or is cleared, and stays false while an
intermediate mode is shown.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: f2a3644b-5f57-4853-8ca6-c3730cc8e48a
The capture loop fixes its stream/display scale when capture starts and keeps
it for the session. The handler accepted a request whenever the capture display
showed the stream's size, so a scaled session (a resume without a mode change:
a 2560x1440 display encoded at 1280x720) whose display later landed on 1280x720
accepted requests and then encoded them at half the requested size.
Latch at capture start whether the stream encodes its display 1:1, in either
orientation, and refuse requests through the existing refusal path otherwise,
whatever the display shows later. Window capture never follows display changes
and is refused too; requests before capture starts are refused (fail closed).
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: f2a3644b-5f57-4853-8ca6-c3730cc8e48a
…anges for window capture
Window capture reads the monitor's size but keeps the negotiated stream size:
it skips the orientation swap and never follows display changes. The capture
loop still sent the stream-start 0x5507 report with the monitor size, so a
client that applies the display-capture scale to it (e.g. on a portrait
monitor) reset its decoder to the wrong size. Don't send that report for window
capture; display capture is unchanged, and later reports were already limited
to display capture.
Window capture also never honours client-requested sizes, so add
capture_target != window to client_resolution_change_enabled() and stop
advertising LI_FF_CLIENT_RESOLUTION_CHANGE (0x400) for it.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: f2a3644b-5f57-4853-8ca6-c3730cc8e48a
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Summary
Server side of client-driven ("RDP-style") dynamic resolution: a client asks for a new stream resolution mid-session over the existing
0x5506RESOLUTION control message, and the host switches the display mode so the stream follows. Closes #728.Rebased onto current
master. Upstream has since hardened this path itself (#909: VDD/cert/HDR routing and the single-video-session guard; LE payload decoding), so this PR now only adds the config switch, the capability, and safe apply semantics.What it does
video.allow_client_resolution_change(default on), with a web UI checkbox under the display device options (all locales). Moonlight V+ (feat(stream): hot-switch resolution with reconnect fallback qiin2333/moonlight-vplus#780) already sends0x5506 RESOLUTIONviaLiRequestResolutionChange()(feat(stream): add live resolution change requests qiin2333/moonlight-common-c#48) without checking a flag, so defaulting it off would turn its hot switch into a reconnect; turning it off makes the host ignore client requests.platf::platform_caps::client_resolution_change(0x400) is set in the RTSP DESCRIBEx-ss-general.featureFlags, following the convention used by cursor shape, haptics and text context.LI_FF_CLIENT_RESOLUTION_CHANGE. Clients can check it inLiGetHostFeatureFlags()before callingLiRequestResolutionChange(), without reading/serverinfoor knowing host settings.stream::client_resolution_change_enabled():allow_client_resolution_change&&dynamic_resolution_follow_display&&resolution_change = automatic&&capture_target = display&& the session launched with SOPS && Windows.0x5507when it follows the host display.client / displayscale ratio for the whole stream, so client-requested sizes only come out exact when the launch mode was applied 1:1.configure_displayis a no-op.handle_resolution_change), re-checking everything because the config can change after DESCRIBE:get_current_display_modes). A mismatch means the launch mode was not applied 1:1 or the host display changed underneath.session->config.monitor, perf telemetry and the IDR are updated only whenconfigure_displayreturnssuccess. Before, they changed even when the reconfiguration was skipped (another session active, display gone) or failed, so a retry of the same size was wrongly treated as a no-op.deferred_retrycounts as not applied, because since fix(display): 流活动中放弃延迟显示设置应用，防止采集管线楔死 #1055 the deferred retry skips display changes while a stream is active.0x5507and an extra client decoder rebuild.video::pending_display_size_t. Until the display reaches it, the capture loop doesn't follow other sizes; the stream keeps its current size through the scaler.0x5507report whencapture_target = window. Window capture reads the monitor's size but keeps the negotiated size (no orientation swap, no display following), so that report described the monitor, not the stream: a client that applies the display-capture scale to it, e.g. on a portrait monitor, would reset its decoder to the wrong size. Display capture still reports at stream start and on every followed display change.tests/unit/test_stream.cppandtests/unit/test_video.cpp.Client side
LiRequestResolutionChange()(feat(stream): add live resolution change requests qiin2333/moonlight-common-c#48, merged) and theLI_FF_CLIENT_RESOLUTION_CHANGEdefine (Add LI_FF_CLIENT_RESOLUTION_CHANGE and a wire test for LiRequestResolutionChange qiin2333/moonlight-common-c#10)Known limitations
dynamic_resolution_follow_displayon,resolution_change = automaticand display capture; the flag is advertised accordingly.modes_failand the stream keeps its current size.configure_displayruns synchronously on the control thread, as it already did upstream. A mid-stream failure keeps upstream's launch-time cleanup behaviour, and adeferred_retrytimer armed during a locked-desktop stream can outlive the stream. Fixing these needs a dedicated mid-stream reconfigure operation indisplay_device(follow-up).Testing
sunshine,test_sunshine). Full unit suite: 765 passed, 23 hardware-dependent skips, 0 failed, including the 5ClientResolutionChangeTests.validate-i18n(19 locales), eslint, the web UI test suite (178/178) and the vite production build all pass.