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device provider: add convenience macros to register

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This macros will help to register a device provider
apart from a given plugin such as in a static build
of gstreamer where libgstreamer-full is generated.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/661>
This commit is contained in:
Stéphane Cerveau 2020-11-27 17:33:33 +01:00
parent 7828237496
commit ff36ce0051
2 changed files with 58 additions and 3 deletions
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51
gst/gstdeviceprovider.h
View file

@ -26,6 +26,57 @@
#include <gst/gstelement.h>
/**
* GST_DEVICE_PROVIDER_REGISTER_DEFINE:
*
* @d_p: The device provider name in lower case, with words separated by '_'.
* Used to generate `gst_device_provider_register_*(GstPlugin* plugin)`.
* @d_p_n: The public name of the device provider
* @r: The #GstRank of the device provider (higher rank means more importance when autoplugging, see #GstRank)
* @t: The #GType of the device provider.
*
* A convenience macro to define the entry point of a
* device provider `gst_device_provider_register_*(GstPlugin* plugin)`.
*
* Since: 1.20
*/
#define GST_DEVICE_PROVIDER_REGISTER_DEFINE(d_p, d_p_n, r, t) \
G_BEGIN_DECLS \
gboolean G_PASTE (gst_device_provider_register_, d_p) (GstPlugin * plugin) \
{ \
return gst_device_provider_register (plugin, d_p_n, r, t); \
} \
G_END_DECLS
/**
* GST_DEVICE_PROVIDER_REGISTER_DECLARE:
* @d_p: The device provider name in lower case, with words separated by '_'.
*
* This macro can be used to declare a new device provider.
* It has to be used in combination with #GST_DEVICE_PROVIDER_REGISTER_DEFINE macro
* and must be placed outside any block to declare the device provider registration
* function.
*
* Since: 1.20
*/
#define GST_DEVICE_PROVIDER_REGISTER_DECLARE(d_p) \
G_BEGIN_DECLS \
gboolean G_PASTE(gst_device_provider_register_, d_p) (GstPlugin * plugin); \
G_END_DECLS
/**
* GST_DEVICE_PROVIDER_REGISTER:
* @d_p: The device provider name in lower case, with words separated by '_'.
* @plugin: The #GstPlugin where to register the device provider.
*
* This macro can be used to register a device provider into a #GstPlugin.
* This method will be usually called in the plugin init function
* but can also be called with a NULL plugin.
*
* Since: 1.20
*/
#define GST_DEVICE_PROVIDER_REGISTER(d_p, plugin) G_PASTE(gst_device_provider_register_, d_p) (plugin)
G_BEGIN_DECLS
typedef struct _GstDeviceProvider GstDeviceProvider;

10
tests/check/gst/gstdevice.c
View file

@ -174,8 +174,12 @@ gst_test_device_provider_init (GstTestDeviceProvider * self)
{
}
static void
register_test_device_provider (void)
GST_DEVICE_PROVIDER_REGISTER_DECLARE (testdeviceprovider);
GST_DEVICE_PROVIDER_REGISTER_DEFINE (testdeviceprovider, "testdeviceprovider",
1, gst_test_device_provider_get_type ())
static void register_test_device_provider (void)
{
gst_device_provider_register (NULL, "testdeviceprovider", 1,
gst_test_device_provider_get_type ());
@ -187,7 +191,7 @@ GST_START_TEST (test_device_provider_factory)
GList *factories;
GstDeviceProviderFactory *f;
register_test_device_provider ();
GST_DEVICE_PROVIDER_REGISTER (testdeviceprovider, NULL);
factories = gst_device_provider_factory_list_get_device_providers (1);