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wasapi2enumerator: Avoid racy device probing

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IMMDeviceEnumerator may fire a series of callbacks even for a single
device plug/unplug event. To avoid redundant probing, start device
enumeration only after no further callbacks are received for 100ms.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9468>
This commit is contained in:
Seungha Yang 2025-07-31 22:22:47 +09:00 committed by GStreamer Marge Bot
parent e515b1aee8
commit df95f95206
1 changed files with 18 additions and 2 deletions
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20
subprojects/gst-plugins-bad/sys/wasapi2/gstwasapi2enumerator.cpp
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@ -28,6 +28,7 @@
#include <wrl.h>
#include <functiondiscoverykeys_devpkey.h>
#include <string>
#include <atomic>
/* *INDENT-OFF* */
using namespace Microsoft::WRL;
@ -265,6 +266,7 @@ struct GstWasapi2EnumeratorPrivate
ComPtr<IMMNotificationClient> client;
Wasapi2ActivationHandler *capture_activator = nullptr;
Wasapi2ActivationHandler *render_activator = nullptr;
std::atomic<int> notify_count = { 0 };
void ClearCOM ()
{
@ -342,12 +344,26 @@ static void
gst_wasapi2_on_device_updated (GstWasapi2Enumerator * object)
{
/* *INDENT-OFF* */
g_main_context_invoke_full (object->context, G_PRIORITY_DEFAULT,
auto priv = object->priv;
auto count = priv->notify_count.fetch_add (1);
GST_LOG ("notify count before scheduling %d", count);
auto source = g_timeout_source_new (100);
g_source_set_callback (source,
[] (gpointer obj) -> gboolean {
g_signal_emit (obj, wasapi2_device_signals[SIGNAL_UPDATED], 0);
auto self = GST_WASAPI2_ENUMERATOR (obj);
auto priv = self->priv;
auto count = priv->notify_count.fetch_sub (1);
GST_LOG ("scheduled notify count %d", count);
if (count == 1)
g_signal_emit (obj, wasapi2_device_signals[SIGNAL_UPDATED], 0);
return G_SOURCE_REMOVE;
},
gst_object_ref (object), (GDestroyNotify) gst_object_unref);
g_source_attach (source, object->context);
g_source_unref (source);
/* *INDENT-ON* */
}