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/* WirePlumber
*
* Copyright © 2024 Collabora Ltd.
* @author George Kiagiadakis <george.kiagiadakis@collabora.com>
*
* SPDX-License-Identifier: MIT
*
* This is an example that shows how to correctly set additional node properties
* that reside in a special "Props" field that is called "params". These show up
* in pw-dump as an array, like this:
*
* "Props": [
* {
* ...
* "params": [
* "key1",
* value1,
* "key2",
* value2,
* ...
* ]
* },
* {
* "params": [
* "additional_key",
* additional_value,
* ]
* }
* ],
*
* The correct way to set them is to construct a Props object that has a "params"
* property and inside that property add a POD structure with the key/value
* pairs listed in order.
*
* This example also parses the key/value pairs from a JSON array that is provided
* on the command line, so you can call this like this:
*
* $ ./filter-chain-params NODE_ID '["key1", value1, "key2", value2]'
*
*/
#include <wp/wp.h>
#include <stdio.h>
typedef struct
{
GMainLoop *loop;
WpCore *core;
WpObjectManager *om;
gint arg_id;
WpSpaJson *arg_params;
} Data;
static void
async_quit (WpCore * core, GAsyncResult * res, Data * data)
{
g_main_loop_quit (data->loop);
}
static WpSpaPod *
construct_params_pod (WpSpaJson * params_j)
{
// the inner POD is a struct
g_autoptr (WpSpaPodBuilder) b_struct = wp_spa_pod_builder_new_struct ();
// iterate the JSON array and fill the inner POD
int state = 0;
g_autoptr (WpIterator) it = wp_spa_json_new_iterator (params_j);
g_auto (GValue) val = G_VALUE_INIT;
for (; wp_iterator_next (it, &val); g_value_unset (&val)) {
WpSpaJson *val_json = g_value_get_boxed (&val);
switch (state) {
case 0: { //parsing key
g_autofree gchar * key = wp_spa_json_parse_string (val_json);
wp_spa_pod_builder_add_string (b_struct, key);
break;
}
case 1: //parsing value
if (wp_spa_json_is_int (val_json)) {
gint value = 0;
wp_spa_json_parse_int (val_json, &value);
wp_spa_pod_builder_add_int (b_struct, value);
}
else if (wp_spa_json_is_float (val_json)) {
gfloat value = 0.0;
wp_spa_json_parse_float (val_json, &value);
wp_spa_pod_builder_add_float (b_struct, value);
}
else if (wp_spa_json_is_boolean (val_json)) {
gboolean value = FALSE;
wp_spa_json_parse_boolean (val_json, &value);
wp_spa_pod_builder_add_boolean (b_struct, value);
}
else {
g_autofree gchar * value = wp_spa_json_parse_string (val_json);
wp_spa_pod_builder_add_string (b_struct, value);
}
break;
default:
break;
}
state = (state + 1) % 2;
}
if (state == 1)
printf ("WARNING: last key didn't have a value!\n");
g_autoptr (WpSpaPod) pod_struct = wp_spa_pod_builder_end (b_struct);
// now fill the outer POD, which is an object of type Props
g_autoptr (WpSpaPodBuilder) b_obj =
wp_spa_pod_builder_new_object ("Spa:Pod:Object:Param:Props", "Props");
wp_spa_pod_builder_add (b_obj, "params", "P", pod_struct, NULL);
return wp_spa_pod_builder_end (b_obj);
}
static void
on_om_installed (WpObjectManager * om, Data * data)
{
g_autoptr (WpPipewireObject) pwobj = wp_object_manager_lookup (om, WP_TYPE_NODE,
WP_CONSTRAINT_TYPE_G_PROPERTY, "bound-id", "=u", data->arg_id, NULL);
wp_pipewire_object_set_param (pwobj, "Props", 0,
construct_params_pod (data->arg_params));
wp_core_sync (data->core, NULL, (GAsyncReadyCallback) async_quit, data);
}
static void
on_core_activated (WpObject * core, GAsyncResult * res, Data * data)
{
g_autoptr (GError) error = NULL;
if (!wp_object_activate_finish (core, res, &error)) {
fprintf (stderr, "%s\n", error->message);
g_main_loop_quit (data->loop);
return;
}
data->om = wp_object_manager_new ();
wp_object_manager_add_interest (data->om, WP_TYPE_NODE,
WP_CONSTRAINT_TYPE_G_PROPERTY, "bound-id", "=u", data->arg_id, NULL);
wp_object_manager_request_object_features (data->om, WP_TYPE_NODE,
WP_PIPEWIRE_OBJECT_FEATURES_ALL);
g_signal_connect (data->om, "installed", G_CALLBACK (on_om_installed), data);
wp_core_install_object_manager (data->core, data->om);
}
int
main (int argc, char **argv)
{
Data data = {0};
wp_init (WP_INIT_ALL);
if (argc < 2) {
printf ("Usage: %s ID '[param1, value1, param2, value2, ...]'\n", argv[0]);
return 1;
}
data.loop = g_main_loop_new (NULL, FALSE);
data.core = wp_core_new (NULL, NULL, NULL);
data.arg_id = atoi (argv[1]);
data.arg_params = wp_spa_json_new_wrap_string (argv[2]);
wp_object_activate (WP_OBJECT (data.core), WP_CORE_FEATURE_CONNECTED, NULL,
(GAsyncReadyCallback) on_core_activated, &data);
g_main_loop_run (data.loop);
wp_spa_json_unref (data.arg_params);
g_object_unref (data.core);
g_main_loop_unref (data.loop);
return 0;
}
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