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pipewire: device: Add a send_command method

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For now, useful for sending custom commands to devices. Using this from
the command line might look something like:

```sh
$ pw-cli send-command <device-id> VolumeControl '{"volumeUp": <route-id>}'
```
This commit is contained in:
Arun Raghavan 2026-03-03 12:34:45 -08:00
parent 0294e06a80
commit 00bdbed780
6 changed files with 115 additions and 7 deletions
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34
src/modules/module-client-device/protocol-native.c
View file

@ -200,6 +200,36 @@ static int device_demarshal_set_param(void *object, const struct pw_protocol_nat
return 0;
}
static int device_marshal_send_command(void *object,
const struct spa_command *command)
{
struct pw_resource *resource = object;
struct spa_pod_builder *b;
b = pw_protocol_native_begin_resource(resource, SPA_DEVICE_METHOD_SEND_COMMAND, NULL);
spa_pod_builder_add_struct(b,
SPA_POD_Pod(command));
return pw_protocol_native_end_resource(resource, b);
}
static int device_demarshal_send_command(void *object, const struct pw_protocol_native_message *msg)
{
struct pw_proxy *proxy = object;
struct spa_pod_parser prs;
struct spa_command *command;
spa_pod_parser_init(&prs, msg->data, msg->size);
if (spa_pod_parser_get_struct(&prs,
SPA_POD_Pod(&command)) < 0)
return -EINVAL;
pw_proxy_notify(proxy, struct spa_device_methods, send_command, 1,
command);
return 0;
}
static void device_marshal_info(void *data,
const struct spa_device_info *info)
{
@ -482,7 +512,8 @@ static const struct spa_device_methods pw_protocol_native_device_method_marshal
.add_listener = &device_marshal_add_listener,
.sync = &device_marshal_sync,
.enum_params = &device_marshal_enum_params,
.set_param = &device_marshal_set_param
.set_param = &device_marshal_set_param,
.send_command = &device_marshal_send_command,
};
static const struct pw_protocol_native_demarshal
@ -492,6 +523,7 @@ pw_protocol_native_device_method_demarshal[SPA_DEVICE_METHOD_NUM] =
[SPA_DEVICE_METHOD_SYNC] = { &device_demarshal_sync, 0 },
[SPA_DEVICE_METHOD_ENUM_PARAMS] = { &device_demarshal_enum_params, 0 },
[SPA_DEVICE_METHOD_SET_PARAM] = { &device_demarshal_set_param, 0 },
[SPA_DEVICE_METHOD_SEND_COMMAND] = { &device_demarshal_send_command, 0 },
};
static const struct spa_device_events pw_protocol_native_device_event_marshal = {

30
src/modules/module-protocol-native/protocol-native.c
View file

@ -1056,6 +1056,34 @@ static int device_demarshal_set_param(void *object, const struct pw_protocol_nat
return pw_resource_notify(resource, struct pw_device_methods, set_param, 0, id, flags, param);
}
static int device_marshal_send_command(void *object, const struct spa_command *command)
{
struct pw_proxy *proxy = object;
struct spa_pod_builder *b;
b = pw_protocol_native_begin_proxy(proxy, PW_NODE_METHOD_SEND_COMMAND, NULL);
spa_pod_builder_add_struct(b,
SPA_POD_Pod(command));
return pw_protocol_native_end_proxy(proxy, b);
}
static int device_demarshal_send_command(void *object, const struct pw_protocol_native_message *msg)
{
struct pw_resource *resource = object;
struct spa_pod_parser prs;
struct spa_command *command;
spa_pod_parser_init(&prs, msg->data, msg->size);
if (spa_pod_parser_get_struct(&prs,
SPA_POD_Pod(&command)) < 0)
return -EINVAL;
if (command == NULL)
return -EINVAL;
return pw_resource_notify(resource, struct pw_device_methods, send_command, 1, command);
}
static int factory_method_marshal_add_listener(void *object,
struct spa_hook *listener,
const struct pw_factory_events *events,
@ -2110,6 +2138,7 @@ static const struct pw_device_methods pw_protocol_native_device_method_marshal =
.subscribe_params = &device_marshal_subscribe_params,
.enum_params = &device_marshal_enum_params,
.set_param = &device_marshal_set_param,
.send_command = &device_marshal_send_command,
};
static const struct pw_protocol_native_demarshal
@ -2118,6 +2147,7 @@ pw_protocol_native_device_method_demarshal[PW_DEVICE_METHOD_NUM] = {
[PW_DEVICE_METHOD_SUBSCRIBE_PARAMS] = { &device_demarshal_subscribe_params, 0, },
[PW_DEVICE_METHOD_ENUM_PARAMS] = { &device_demarshal_enum_params, 0, },
[PW_DEVICE_METHOD_SET_PARAM] = { &device_demarshal_set_param, PW_PERM_W, },
[PW_DEVICE_METHOD_SEND_COMMAND] = { &device_demarshal_send_command, PW_PERM_W, },
};
static const struct pw_device_events pw_protocol_native_device_event_marshal = {