[calls] media-codecs: Add codec availability check to public API

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 27463212d9a56f3551cbdee361656b563f14d896
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Thu Nov 25 03:31:44 2021 +0100

    media-codecs: Add codec availability check to public API
    
    This will be useful for building a list of preferred audio codecs.

 plugins/sip/gst-rfc3551.c | 8 +++++++-
 plugins/sip/gst-rfc3551.h | 1 +
 2 files changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/plugins/sip/gst-rfc3551.c b/plugins/sip/gst-rfc3551.c
index 634c0340..cd022b47 100644
--- a/plugins/sip/gst-rfc3551.c
+++ b/plugins/sip/gst-rfc3551.c
@@ -39,7 +39,13 @@ static MediaCodecInfo gst_codecs[] = {
 };
 
 
-static gboolean
+/**
+ * media_codec_available_in_gst:
+ * @codec: A #MediaCodecInfo
+ *
+ * Returns: %TRUE if codec is available on your system, %FALSE otherwise
+ */
+gboolean
 media_codec_available_in_gst (MediaCodecInfo *codec) {
   gboolean available = FALSE;
   GstRegistry *registry = gst_registry_get ();
diff --git a/plugins/sip/gst-rfc3551.h b/plugins/sip/gst-rfc3551.h
index 7b77ab60..8c53f15f 100644
--- a/plugins/sip/gst-rfc3551.h
+++ b/plugins/sip/gst-rfc3551.h
@@ -44,6 +44,7 @@ typedef struct {
 } MediaCodecInfo;
 
 
+gboolean         media_codec_available_in_gst (MediaCodecInfo *codec);
 MediaCodecInfo*  media_codec_by_name (const char *name);
 MediaCodecInfo*  media_codec_by_payload_id (uint payload_id);
 gchar*           media_codec_get_gst_capabilities (MediaCodecInfo *codec);