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/*
* Copyright © 2019 Collabora Ltd.
* @author George Kiagiadakis <george.kiagiadakis@collabora.com>
*
* SPDX-License-Identifier: MIT
*/
#include "audiomixer.h"
#include <wp/wp.h>
#include <pipewire/pipewire.h>
struct audiomixer
{
WpCore *core;
GMainLoop *loop;
GMainContext *context;
GThread *thread;
GMutex lock;
GCond cond;
GPtrArray *mixer_controls;
gint initialized;
WpObjectManager *om;
WpPlugin *default_nodes_api;
WpPlugin *mixer_api;
const struct audiomixer_events *events;
void *events_data;
};
struct mixer_control_impl
{
struct mixer_control pub;
guint32 node_id;
};
struct action
{
struct audiomixer *audiomixer;
union {
struct {
guint32 id;
gfloat volume;
} change_volume;
struct {
guint32 id;
gboolean mute;
} change_mute;
};
};
static gboolean
get_mixer_controls (struct audiomixer * self, guint32 node_id, gdouble * vol, gboolean * mute)
{
g_autoptr (GVariant) v = NULL;
g_signal_emit_by_name (self->mixer_api, "get-volume", node_id, &v);
return v &&
g_variant_lookup (v, "volume", "d", vol) &&
g_variant_lookup (v, "mute", "b", mute);
}
static void
add_control (struct audiomixer *self, const char *name, guint32 node_id)
{
struct mixer_control_impl *mixctl = NULL;
gdouble volume = 1.0;
gboolean mute = FALSE;
/* get current values */
if (!get_mixer_controls (self, node_id, &volume, &mute)) {
g_warning ("failed to get object controls when populating controls");
return;
}
/* create the control */
mixctl = g_new0 (struct mixer_control_impl, 1);
snprintf (mixctl->pub.name, sizeof (mixctl->pub.name), "%s", name);
mixctl->pub.volume = volume;
mixctl->pub.mute = mute;
mixctl->node_id = node_id;
g_ptr_array_add (self->mixer_controls, mixctl);
g_debug ("added control %s", mixctl->pub.name);
}
static void
volume_changed (struct audiomixer * self, guint32 node_id)
{
g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
gdouble vol = 1.0;
gboolean mute = FALSE;
for (guint i = 0; i < self->mixer_controls->len; i++) {
struct mixer_control_impl *ctl;
guint change_mask = 0;
ctl = g_ptr_array_index (self->mixer_controls, i);
if (ctl->node_id != node_id)
continue;
if (!get_mixer_controls (self, node_id, &vol, &mute)) {
g_warning ("failed to get object controls when volume changed");
return;
}
if ((ctl->pub.volume - 0.01f) > vol || (ctl->pub.volume + 0.01f) < vol) {
ctl->pub.volume = vol;
change_mask |= MIXER_CONTROL_CHANGE_FLAG_VOLUME;
}
if (ctl->pub.mute != mute) {
ctl->pub.mute = mute;
change_mask |= MIXER_CONTROL_CHANGE_FLAG_MUTE;
}
if (self->events && self->events->value_changed)
self->events->value_changed (self->events_data, change_mask, &ctl->pub);
break;
}
}
static void
rescan_controls (struct audiomixer * self)
{
g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
g_autoptr (WpIterator) it = NULL;
g_auto (GValue) val = G_VALUE_INIT;
guint32 id = -1;
g_debug ("rescan");
/* clear previous */
g_ptr_array_set_size (self->mixer_controls, 0);
/* add master controls */
g_signal_emit_by_name (self->default_nodes_api, "get-default-node",
"Audio/Sink", &id);
if (id != (guint32)-1)
add_control (self, "Master Playback", id);
g_signal_emit_by_name (self->default_nodes_api, "get-default-node",
"Audio/Source", &id);
if (id != (guint32)-1)
add_control (self, "Master Capture", id);
/* add endpoints */
it = wp_object_manager_new_iterator (self->om);
for (; wp_iterator_next (it, &val); g_value_unset (&val)) {
WpPipewireObject *ep = g_value_get_object (&val);
const gchar *name = wp_pipewire_object_get_property (ep, "endpoint.description");
const gchar *node = wp_pipewire_object_get_property (ep, "node.id");
id = node ? atoi(node) : 0;
if (name && id != 0 && id != (guint32)-1)
add_control (self, name, id);
}
/* notify subscribers */
if (self->events && self->events->controls_changed)
self->events->controls_changed (self->events_data);
g_cond_broadcast (&self->cond);
}
static void
on_default_nodes_activated (WpObject * p, GAsyncResult * res, struct audiomixer * self)
{
g_autoptr (GError) error = NULL;
if (!wp_object_activate_finish (p, res, &error)) {
g_warning ("%s", error->message);
}
if (wp_object_get_active_features (WP_OBJECT (self->mixer_api))
& WP_PLUGIN_FEATURE_ENABLED)
wp_core_install_object_manager (self->core, self->om);
g_signal_connect_swapped (self->default_nodes_api, "changed",
(GCallback) rescan_controls, self);
}
static void
on_mixer_activated (WpObject * p, GAsyncResult * res, struct audiomixer * self)
{
g_autoptr (GError) error = NULL;
if (!wp_object_activate_finish (p, res, &error)) {
g_warning ("%s", error->message);
}
if (wp_object_get_active_features (WP_OBJECT (self->default_nodes_api))
& WP_PLUGIN_FEATURE_ENABLED)
wp_core_install_object_manager (self->core, self->om);
g_signal_connect_swapped (self->mixer_api, "changed",
(GCallback) volume_changed, self);
}
static void
on_core_connected (struct audiomixer * self)
{
self->om = wp_object_manager_new ();
wp_object_manager_add_interest (self->om, WP_TYPE_ENDPOINT,
WP_CONSTRAINT_TYPE_PW_GLOBAL_PROPERTY,
PW_KEY_MEDIA_CLASS, "#s", "Audio/*", NULL);
wp_object_manager_request_object_features (self->om,
WP_TYPE_ENDPOINT, WP_OBJECT_FEATURES_ALL);
g_signal_connect_swapped (self->om, "objects-changed",
(GCallback) rescan_controls, self);
wp_object_activate (WP_OBJECT (self->default_nodes_api),
WP_PLUGIN_FEATURE_ENABLED, NULL,
(GAsyncReadyCallback) on_default_nodes_activated, self);
wp_object_activate (WP_OBJECT (self->mixer_api),
WP_PLUGIN_FEATURE_ENABLED, NULL,
(GAsyncReadyCallback) on_mixer_activated, self);
}
static void
on_core_disconnected (struct audiomixer * self)
{
g_ptr_array_set_size (self->mixer_controls, 0);
g_clear_object (&self->om);
g_signal_handlers_disconnect_by_data (self->default_nodes_api, self);
g_signal_handlers_disconnect_by_data (self->mixer_api, self);
wp_object_deactivate (WP_OBJECT (self->default_nodes_api), WP_PLUGIN_FEATURE_ENABLED);
wp_object_deactivate (WP_OBJECT (self->mixer_api), WP_PLUGIN_FEATURE_ENABLED);
}
static void
audiomixer_init_in_thread (struct audiomixer * self)
{
g_autoptr (GMutexLocker) locker = g_mutex_locker_new (&self->lock);
g_autoptr (GError) error = NULL;
self->context = g_main_context_new ();
g_main_context_push_thread_default (self->context);
self->loop = g_main_loop_new (self->context, FALSE);
self->core = wp_core_new (self->context, NULL);
/* load required API modules */
if (!wp_core_load_component (self->core,
"libwireplumber-module-default-nodes-api", "module", NULL, &error)) {
g_warning ("%s", error->message);
self->initialized = -1;
goto out;
}
if (!wp_core_load_component (self->core,
"libwireplumber-module-mixer-api", "module", NULL, &error)) {
g_warning ("%s", error->message);
self->initialized = -1;
goto out;
}
self->default_nodes_api = wp_plugin_find (self->core, "default-nodes-api");
self->mixer_api = wp_plugin_find (self->core, "mixer-api");
g_object_set (G_OBJECT (self->mixer_api), "scale", 1 /* cubic */, NULL);
g_signal_connect_swapped (self->core, "connected",
G_CALLBACK (on_core_connected), self);
g_signal_connect_swapped (self->core, "disconnected",
G_CALLBACK (on_core_disconnected), self);
self->initialized = 1;
out:
g_cond_broadcast (&self->cond);
}
static void *
audiomixer_thread (struct audiomixer * self)
{
audiomixer_init_in_thread (self);
/* main loop for the thread; quits only when audiomixer_free() is called */
g_main_loop_run (self->loop);
wp_core_disconnect (self->core);
g_clear_object (&self->default_nodes_api);
g_clear_object (&self->mixer_api);
g_object_unref (self->core);
g_main_context_pop_thread_default (self->context);
g_main_loop_unref (self->loop);
g_main_context_unref (self->context);
return NULL;
}
struct audiomixer *
audiomixer_new (void)
{
struct audiomixer *self = calloc(1, sizeof(struct audiomixer));
wp_init (WP_INIT_ALL);
g_mutex_init (&self->lock);
g_cond_init (&self->cond);
self->mixer_controls = g_ptr_array_new_with_free_func (g_free);
g_mutex_lock (&self->lock);
self->initialized = 0;
self->thread = g_thread_new ("audiomixer", (GThreadFunc) audiomixer_thread,
self);
while (self->initialized == 0)
g_cond_wait (&self->cond, &self->lock);
g_mutex_unlock (&self->lock);
return self;
}
void
audiomixer_free(struct audiomixer *self)
{
g_main_loop_quit (self->loop);
g_thread_join (self->thread);
g_ptr_array_unref (self->mixer_controls);
g_cond_clear (&self->cond);
g_mutex_clear (&self->lock);
free (self);
}
void
audiomixer_lock(struct audiomixer *self)
{
g_mutex_lock (&self->lock);
}
void
audiomixer_unlock(struct audiomixer *self)
{
g_mutex_unlock (&self->lock);
}
static gboolean
do_connect (WpCore * core)
{
if (!wp_core_connect (core))
g_warning ("Failed to connect to PipeWire");
return G_SOURCE_REMOVE;
}
int
audiomixer_ensure_controls(struct audiomixer *self, int timeout_sec)
{
gint64 end_time = g_get_monotonic_time () + timeout_sec * G_TIME_SPAN_SECOND;
g_return_val_if_fail (self->initialized == 1, -EIO);
if (!wp_core_is_connected (self->core))
g_main_context_invoke (self->context, (GSourceFunc) do_connect, self->core);
while (self->mixer_controls->len == 0) {
if (!g_cond_wait_until (&self->cond, &self->lock, end_time))
return -ETIMEDOUT;
}
return 0;
}
const struct mixer_control **
audiomixer_get_active_controls(struct audiomixer *self,
unsigned int *n_controls)
{
*n_controls = self->mixer_controls->len;
return (const struct mixer_control **) self->mixer_controls->pdata;
}
const struct mixer_control *
audiomixer_find_control(struct audiomixer *self, const char *name)
{
struct mixer_control *ctl;
for (guint i = 0; i < self->mixer_controls->len; i++) {
ctl = g_ptr_array_index (self->mixer_controls, i);
if (!strcmp(ctl->name, name)) {
return ctl;
}
}
return NULL;
}
void
audiomixer_add_event_listener(struct audiomixer *self,
const struct audiomixer_events *events,
void *data)
{
self->events = events;
self->events_data = data;
}
static gboolean
do_change_volume (struct action * action)
{
struct audiomixer *self = action->audiomixer;
GVariantBuilder b = G_VARIANT_BUILDER_INIT (G_VARIANT_TYPE_VARDICT);
gboolean ret = FALSE;
g_variant_builder_add (&b, "{sv}", "volume",
g_variant_new_double (action->change_volume.volume));
g_signal_emit_by_name (self->mixer_api, "set-volume",
action->change_volume.id, g_variant_builder_end (&b), &ret);
if (!ret)
g_warning ("mixer api set-volume failed");
return G_SOURCE_REMOVE;
}
void
audiomixer_change_volume(struct audiomixer *self,
const struct mixer_control *control,
double volume)
{
const struct mixer_control_impl *impl =
(const struct mixer_control_impl *) control;
struct action * action;
g_return_if_fail (self->initialized == 1);
/* schedule the action to run on the audiomixer thread */
action = g_new0 (struct action, 1);
action->audiomixer = self;
action->change_volume.id = impl->node_id;
action->change_volume.volume = (gfloat) volume;
wp_core_idle_add (self->core, NULL, (GSourceFunc) do_change_volume, action,
g_free);
}
static gboolean
do_change_mute (struct action * action)
{
struct audiomixer *self = action->audiomixer;
GVariantBuilder b = G_VARIANT_BUILDER_INIT (G_VARIANT_TYPE_VARDICT);
gboolean ret = FALSE;
g_variant_builder_add (&b, "{sv}", "mute",
g_variant_new_double (action->change_mute.mute));
g_signal_emit_by_name (self->mixer_api, "set-volume",
action->change_mute.id, g_variant_builder_end (&b), &ret);
if (!ret)
g_warning ("mixer api set-volume failed");
return G_SOURCE_REMOVE;
}
void
audiomixer_change_mute(struct audiomixer *self,
const struct mixer_control *control,
bool mute)
{
const struct mixer_control_impl *impl =
(const struct mixer_control_impl *) control;
struct action * action;
g_return_if_fail (self->initialized == 1);
/* schedule the action to run on the audiomixer thread */
action = g_new0 (struct action, 1);
action->audiomixer = self;
action->change_mute.id = impl->node_id;
action->change_mute.mute = mute;
wp_core_idle_add (self->core, NULL, (GSourceFunc) do_change_mute, action,
g_free);
}
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