From 24156f5471b8edcbcf7c446b2405bc3597cbe212 Mon Sep 17 00:00:00 2001
From: Frank Praznik <[EMAIL REDACTED]>
Date: Fri, 2 Jan 2026 12:34:37 -0500
Subject: [PATCH] pipewire: Check for the audio service when determining driver
preference
Wireplumber now exposes a list of session services, so check the "session.services" property for an "audio" entry to determine whether Pipewire is configured for audio playback/capture.
---
src/audio/pipewire/SDL_pipewire.c | 51 ++++++++++++++++++++++++++++---
1 file changed, 47 insertions(+), 4 deletions(-)
diff --git a/src/audio/pipewire/SDL_pipewire.c b/src/audio/pipewire/SDL_pipewire.c
index ee59ca391fc3c..d40453d478fa0 100644
--- a/src/audio/pipewire/SDL_pipewire.c
+++ b/src/audio/pipewire/SDL_pipewire.c
@@ -256,6 +256,8 @@ static int hotplug_init_seq_val;
static bool hotplug_init_complete;
static bool hotplug_events_enabled;
+static bool pipewire_have_session_services;
+static bool pipewire_have_audio_service;
static int pipewire_version_major;
static int pipewire_version_minor;
static int pipewire_version_patch;
@@ -438,7 +440,7 @@ static void core_events_interface_callback(void *object, uint32_t id, int seq)
}
}
-static void core_events_metadata_callback(void *object, uint32_t id, int seq)
+static void core_events_generic_callback(void *object, uint32_t id, int seq)
{
struct node_object *node = object;
@@ -449,7 +451,7 @@ static void core_events_metadata_callback(void *object, uint32_t id, int seq)
static const struct pw_core_events hotplug_init_core_events = { PW_VERSION_CORE_EVENTS, .info = core_events_hotplug_info_callback, .done = core_events_hotplug_init_callback };
static const struct pw_core_events interface_core_events = { PW_VERSION_CORE_EVENTS, .done = core_events_interface_callback };
-static const struct pw_core_events metadata_core_events = { PW_VERSION_CORE_EVENTS, .done = core_events_metadata_callback };
+static const struct pw_core_events generic_core_events = { PW_VERSION_CORE_EVENTS, .done = core_events_generic_callback };
static void hotplug_core_sync(struct node_object *node)
{
@@ -652,6 +654,35 @@ static int metadata_property(void *object, Uint32 subject, const char *key, cons
static const struct pw_metadata_events metadata_node_events = { PW_VERSION_METADATA_EVENTS, .property = metadata_property };
+// Client info node callback.
+static void client_info(void *data, const struct pw_client_info *info)
+{
+ // If WirePlumber lists the session services, check to see if audio is enabled.
+ const char *services = spa_dict_lookup(info->props, "session.services");
+ if (services) {
+ pipewire_have_session_services = true;
+
+ // Services are in a JSON array.
+ struct spa_json iter[2];
+ spa_json_init(&iter[0], services, SDL_strlen(services));
+ if (spa_json_enter_array(&iter[0], &iter[1]) > 0) {
+ char element[PW_MAX_IDENTIFIER_LENGTH];
+ while (spa_json_get_string(&iter[1], element, sizeof(element)) > 0) {
+ if (SDL_strcmp(element, "audio") == 0) {
+ pipewire_have_audio_service = true;
+ break;
+ }
+ }
+ }
+ }
+}
+
+static const struct pw_client_events client_node_events = {
+ .version = PW_VERSION_CLIENT_EVENTS,
+ .info = client_info,
+ .permissions = NULL
+};
+
// Global registry callbacks
static void registry_event_global_callback(void *object, uint32_t id, uint32_t permissions, const char *type, uint32_t version,
const struct spa_dict *props)
@@ -714,12 +745,21 @@ static void registry_event_global_callback(void *object, uint32_t id, uint32_t p
}
}
} else if (!SDL_strcmp(type, PW_TYPE_INTERFACE_Metadata)) {
- node = node_object_new(id, type, version, &metadata_node_events, &metadata_core_events);
+ node = node_object_new(id, type, version, &metadata_node_events, &generic_core_events);
if (!node) {
SDL_SetError("Pipewire: Failed to allocate metadata node");
return;
}
+ // Update sync points
+ hotplug_core_sync(node);
+ } else if (!SDL_strcmp(type, PW_TYPE_INTERFACE_Client)) {
+ node = node_object_new(id, type, version, &client_node_events, &generic_core_events);
+ if (!node) {
+ SDL_SetError("Pipewire: Failed to allocate client info node");
+ return;
+ }
+
// Update sync points
hotplug_core_sync(node);
}
@@ -1282,6 +1322,8 @@ static void PIPEWIRE_Deinitialize(void)
if (pipewire_initialized) {
hotplug_loop_destroy();
deinit_pipewire_library();
+ pipewire_have_session_services = false;
+ pipewire_have_audio_service = false;
pipewire_initialized = false;
}
}
@@ -1335,7 +1377,8 @@ static bool PIPEWIRE_PREFERRED_Init(SDL_AudioDriverImpl *impl)
PIPEWIRE_pw_thread_loop_unlock(hotplug_loop);
- if (no_devices || !pipewire_core_version_at_least(1, 0, 0)) {
+ if ((pipewire_have_session_services && !pipewire_have_audio_service) ||
+ (!pipewire_have_session_services && (no_devices || !pipewire_core_version_at_least(1, 0, 0)))) {
PIPEWIRE_Deinitialize();
return false;
}