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Add support for virtual source

Browse source 
A virtual source is usually implemented with a null-sink, it looks
like a source to pulseaudio clients but just forwards what it gets
as input.

Make sure the port names make sense.

You can use the null sink now as:

pactl load-module module-null-sink sink_name=source object.linger=1
     media.class=Audio/Source/Virtual channel_map=FL,FR,RL,RR

     This creates a node with "input" and "capture" ports and looks
     like a virtual source for pulseaudio clients.

pactl load-module module-null-sink sink_name=source object.linger=1
     media.class=Audio/Sink channel_map=FL,FR,RL,RR

     This creates a node with "playback" and "monitor" ports and looks
     like a virtual sink for pulseaudio clients.

pactl load-module module-null-sink sink_name=source object.linger=1
     media.class=Audio/Duplex channel_map=FL,FR,RL,RR

     This creates a node with "playback" and "capture" ports and looks
     like a virtual source and sink for pulseaudio clients.
This commit is contained in:
Wim Taymans 2020-12-02 15:40:23 +01:00
parent e2f0ab5710
commit 3c2ab98a2a
4 changed files with 38 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

4
src/examples/media-session/policy-node.c
View file

@ -287,7 +287,9 @@ handle_node(struct impl *impl, struct sm_object *object)
else
return 0;
if (strcmp(media_class, "Sink") == 0 || strcmp(media_class, "Duplex") == 0)
if (strcmp(media_class, "Sink") == 0 ||
strcmp(media_class, "Duplex") == 0 ||
strcmp(media_class, "Source/Virtual") == 0)
direction = PW_DIRECTION_INPUT;
else if (strcmp(media_class, "Source") == 0)
direction = PW_DIRECTION_OUTPUT;

13
src/modules/module-adapter/adapter.c
View file

@ -89,7 +89,7 @@ static void node_port_init(void *data, struct pw_impl_port *port)
struct pw_properties *new;
const char *str, *path, *node_name, *media_class;
char position[8], *prefix;
bool is_monitor, is_device, is_duplex;
bool is_monitor, is_device, is_duplex, is_virtual;
direction = pw_impl_port_get_direction(port);
@ -112,14 +112,19 @@ static void node_port_init(void *data, struct pw_impl_port *port)
is_device = false;
is_duplex = media_class != NULL && strstr(media_class, "Duplex") != NULL;
is_virtual = media_class != NULL && strstr(media_class, "Virtual") != NULL;
new = pw_properties_new(NULL, NULL);
if (is_monitor && !is_duplex)
prefix = "monitor";
else if (is_device || is_duplex)
if (is_duplex)
prefix = direction == PW_DIRECTION_INPUT ?
"playback" : "capture";
else if (is_virtual)
prefix = direction == PW_DIRECTION_INPUT ?
"input" : "capture";
else if (is_device)
prefix = direction == PW_DIRECTION_INPUT ?
"playback" : is_monitor ? "monitor" : "capture";
else
prefix = direction == PW_DIRECTION_INPUT ?
"input" : "output";

19
src/modules/module-protocol-pulse/collect.c
View file

@ -35,8 +35,7 @@ static bool object_is_module(struct pw_manager_object *o)
static bool object_is_card(struct pw_manager_object *o)
{
const char *str;
return
strcmp(o->type, PW_TYPE_INTERFACE_Device) == 0 &&
return strcmp(o->type, PW_TYPE_INTERFACE_Device) == 0 &&
o->props != NULL &&
(str = pw_properties_get(o->props, PW_KEY_MEDIA_CLASS)) != NULL &&
strcmp(str, "Audio/Device") == 0;
@ -45,8 +44,7 @@ static bool object_is_card(struct pw_manager_object *o)
static bool object_is_sink(struct pw_manager_object *o)
{
const char *str;
return
strcmp(o->type, PW_TYPE_INTERFACE_Node) == 0 &&
return strcmp(o->type, PW_TYPE_INTERFACE_Node) == 0 &&
o->props != NULL &&
(str = pw_properties_get(o->props, PW_KEY_MEDIA_CLASS)) != NULL &&
(strcmp(str, "Audio/Sink") == 0 || strcmp(str, "Audio/Duplex") == 0);
@ -55,11 +53,12 @@ static bool object_is_sink(struct pw_manager_object *o)
static bool object_is_source(struct pw_manager_object *o)
{
const char *str;
return
strcmp(o->type, PW_TYPE_INTERFACE_Node) == 0 &&
return strcmp(o->type, PW_TYPE_INTERFACE_Node) == 0 &&
o->props != NULL &&
(str = pw_properties_get(o->props, PW_KEY_MEDIA_CLASS)) != NULL &&
(strcmp(str, "Audio/Source") == 0 || strcmp(str, "Audio/Duplex") == 0);
(strcmp(str, "Audio/Source") == 0 ||
strcmp(str, "Audio/Duplex") == 0 ||
strcmp(str, "Audio/Source/Virtual") == 0);
}
static bool object_is_monitor(struct pw_manager_object *o)
@ -79,8 +78,7 @@ static bool object_is_source_or_monitor(struct pw_manager_object *o)
static bool object_is_sink_input(struct pw_manager_object *o)
{
const char *str;
return
strcmp(o->type, PW_TYPE_INTERFACE_Node) == 0 &&
return strcmp(o->type, PW_TYPE_INTERFACE_Node) == 0 &&
o->props != NULL &&
(str = pw_properties_get(o->props, PW_KEY_MEDIA_CLASS)) != NULL &&
strcmp(str, "Stream/Output/Audio") == 0;
@ -89,8 +87,7 @@ static bool object_is_sink_input(struct pw_manager_object *o)
static bool object_is_source_output(struct pw_manager_object *o)
{
const char *str;
return
strcmp(o->type, PW_TYPE_INTERFACE_Node) == 0 &&
return strcmp(o->type, PW_TYPE_INTERFACE_Node) == 0 &&
o->props != NULL &&
(str = pw_properties_get(o->props, PW_KEY_MEDIA_CLASS)) != NULL &&
strcmp(str, "Stream/Input/Audio") == 0;

3
src/modules/module-protocol-pulse/pulse-server.c
View file

@ -3397,6 +3397,9 @@ static int fill_sink_info(struct client *client, struct message *m,
if ((name = spa_dict_lookup(info->props, PW_KEY_NODE_NAME)) != NULL) {
size_t size = strlen(name) + 10;
monitor_name = alloca(size);
if (object_is_source(o))
snprintf(monitor_name, size, "%s", name);
else
snprintf(monitor_name, size, "%s.monitor", name);
}
if ((desc = spa_dict_lookup(info->props, PW_KEY_NODE_DESCRIPTION)) == NULL)