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device provider: add custom register macro

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This macro allows to register a device provider with
a custom function which gives more flexibility when
registering it (see v4l2 register).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/773>
This commit is contained in:
Stéphane Cerveau 2021-03-17 16:39:30 +01:00 committed by GStreamer Marge Bot
parent 3d887c7f07
commit 178c7d2732
1 changed files with 35 additions and 2 deletions
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37
gst/gstdeviceprovider.h
View file

@ -19,13 +19,46 @@
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_DEVICE_PROVIDER_H__
#define __GST_DEVICE_PROVIDER_H__
#include <gst/gstelement.h>
/**
* GST_DEVICE_PROVIDER_REGISTER_DEFINE_CUSTOM:
* @d_p: The device provider name in lower case, with words separated by '_'.
* Used to generate `gst_device_provider_register_*(GstPlugin* plugin)`.
* @register_func: pointer to a method with the format: `gboolean register_func (GstPlugin* plugin);`
*
* A convenience macro to define the entry point of a
* device provider `gst_device_provider_register_*(GstPlugin* plugin)` which uses
* register_func as the main registration method for the device provider.
* As an example, you may define the device provider named "device-provider"
* with the namespace `my` as following using `device_provider_register_custom`:
*
* ```
*
* gboolean my_device_provider_register_custom (GstPlugin * plugin)
* {
* gboolean ret = FALSE;
* ret |= gst_device_provider_register (plugin, "my-device-provider",
GST_RANK_PRIMARY, GST_TYPE_MY_DEVICE_PROVIDER);
* return TRUE;
* }
*
* GST_DEVICE_PROVIDER_REGISTER_DEFINE_CUSTOM (my_device_provider, my_device_provider_register_custom)
* ```
*
* Since: 1.20
*/
#define GST_DEVICE_PROVIDER_REGISTER_DEFINE_CUSTOM(d_p, register_func) \
G_BEGIN_DECLS \
gboolean G_PASTE (gst_device_provider_register_, d_p) (GstPlugin * plugin) \
{ \
return register_func (plugin); \
} \
G_END_DECLS
/**
* GST_DEVICE_PROVIDER_REGISTER_DEFINE:
* @d_p: The device provider name in lower case, with words separated by '_'.