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fix(windows): real native exclude + self-echo removal for screen audio

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"All apps except selected" previously captured the complement of a frozen
app snapshot in INCLUDE mode (missed late-launched apps and system sounds,
wasted captures on silent windows). It now opens a single ProcessLoopbackCapture
in EXCLUDE mode (AUDIOCLIENT_PROCESS_LOOPBACK_MODE_EXCLUDE_TARGET_PROCESS_TREE)
of the one chosen app — true system-mix-minus-one, dynamic so apps launched
after sharing starts are included. The picker enforces single-selection in
exclude mode (the activation params take one target PID).

Adds an "Exclude VoiceCat's own audio (prevents echo)" checkbox (default on,
entire-desktop only) that routes the desktop capture through the same EXCLUDE
path targeting our own process id, killing the whole-device self-echo loop.

No C++/ABI changes. Updates voice.md and PROGRESS.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Talon
2026-06-22 12:28:53 +02:00
parent fb73b694d0
commit 5e18dfa1c9
6 changed files with 131 additions and 34 deletions
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10
clients/windows/VoiceCat.App/Forms/MainForm.cs
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@@ -640,7 +640,7 @@ public partial class MainForm : Form
var scope = picker.ChosenScope;
if (scope is EntireDesktop)
if (scope is EntireDesktop { ExcludeSelf: false })
{
// Existing whole-device WASAPI loopback path — core handles it.
var (result, streamId) = _client.StartStream(VcStreamKind.ScreenAudio, "Desktop audio");
@@ -654,7 +654,8 @@ public partial class MainForm : Form
}
else
{
// Per-app path: suppress core loopback, C# mixer feeds PCM.
// External-feed path: suppress core loopback, C# mixer feeds PCM. Covers the
// per-app modes and "entire desktop except VoiceCat" (single EXCLUDE of self).
var (result, streamId) = _client.StartStreamExternalFeed(VcStreamKind.ScreenAudio, "App audio");
if (result != VcResult.Ok)
{
@@ -664,12 +665,13 @@ public partial class MainForm : Form
_screenStreamId = streamId;
_screenMixer = new ProcessAudioMixer();
_screenMixer.Start(scope, _client, streamId, picker.VisibleApps);
_screenMixer.Start(scope, _client, streamId);
string desc = scope switch
{
EntireDesktop => "entire desktop (excluding VoiceCat)",
OnlyApps o => $"only {o.Pids.Count} app(s)",
AllExceptApps a => $"all except {a.Pids.Count} app(s)",
AllExceptApps a => $"all except {a.Names[0]}",
_ => "apps",
};
AddActivity($"Sharing screen audio: {desc}");