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pulse-server: Add a message to enable/disable mono mixdown

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WirePlumber recently added a mechanism to force mono mixdown on audio
outputs, which is a useful feature for accessibility. Let's also expose
that setting via libpulse for existing audio settings UIs to be able to
use.
This commit is contained in:
Arun Raghavan 2025-12-18 16:35:35 -08:00
parent 8c7890eb52
commit 385161b12a
4 changed files with 73 additions and 7 deletions
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58
src/modules/module-protocol-pulse/message-handler.c
View file

@ -19,6 +19,7 @@
#include "client.h"
#include "collect.h"
#include "defs.h"
#include "log.h"
#include "manager.h"
#include "module.h"
@ -89,6 +90,46 @@ static int bluez_card_object_message_handler(struct client *client, struct pw_ma
return 0;
}
static int core_object_force_mono_output(struct client *client, const char *params, FILE *response)
{
if (!client->have_force_mono_audio) {
/* Not supported, return a null value to indicate that */
fprintf(response, "null");
return 0;
}
if (!params || params[0] == '\0') {
/* No parameter => query the current value */
fprintf(response, "%s", client->force_mono_audio ? "true" : "false");
return 0;
} else {
/* The caller is trying to set a value or clear with a null */
int ret;
if (spa_streq(params, "true")) {
ret = pw_manager_set_metadata(client->manager, client->metadata_sm_settings, PW_ID_CORE,
METADATA_FEATURES_AUDIO_MONO, "Spa:String:JSON", "true");
} else if (spa_streq(params, "false")) {
ret = pw_manager_set_metadata(client->manager, client->metadata_sm_settings, PW_ID_CORE,
METADATA_FEATURES_AUDIO_MONO, "Spa:String:JSON", "false");
} else if (spa_streq(params, "null")) {
ret = pw_manager_set_metadata(client->manager, client->metadata_sm_settings, PW_ID_CORE,
METADATA_FEATURES_AUDIO_MONO, NULL, NULL);
} else {
fprintf(response, "Value must be true, false, or clear");
return -EINVAL;
}
if (ret < 0)
fprintf(response, "Could not set metadata: %s", spa_strerror(ret));
else
fprintf(response, "%s", params);
return ret;
}
}
static int core_object_message_handler(struct client *client, struct pw_manager_object *o, const char *message, const char *params, FILE *response)
{
pw_log_debug(": core %p object message:'%s' params:'%s'", o, message, params);
@ -97,13 +138,14 @@ static int core_object_message_handler(struct client *client, struct pw_manager_
fprintf(response,
"/core <command> [<params>]\n"
"available commands:\n"
" help this help\n"
" list-handlers show available object handlers\n"
" pipewire-pulse:malloc-info show malloc_info\n"
" pipewire-pulse:malloc-trim run malloc_trim\n"
" pipewire-pulse:log-level update log level with <params>\n"
" pipewire-pulse:list-modules list all module names\n"
" pipewire-pulse:describe-module describe module info for <params>"
" help this help\n"
" list-handlers show available object handlers\n"
" pipewire-pulse:malloc-info show malloc_info\n"
" pipewire-pulse:malloc-trim run malloc_trim\n"
" pipewire-pulse:log-level update log level with <params>\n"
" pipewire-pulse:list-modules list all module names\n"
" pipewire-pulse:describe-module describe module info for <params>\n"
" pipewire-pulse:force-mono-output force mono mixdown on all hardware outputs"
);
} else if (spa_streq(message, "list-handlers")) {
bool first = true;
@ -164,6 +206,8 @@ static int core_object_message_handler(struct client *client, struct pw_manager_
} else {
fprintf(response, "Failed to open module.\n");
}
} else if (spa_streq(message, "pipewire-pulse:force-mono-output")) {
return core_object_force_mono_output(client, params, response);
} else {
return -ENOSYS;
}