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Add support for virtual source

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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

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";