sip: Add media manager and sipify origin

* pipeline: we should bind the used socket of our udpsink to the socket udpsrc

plugins/sip/gst-rfc3551.c

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2021 Purism SPC
+ *
+ * This file is part of Calls.
+ *
+ * Calls is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Calls is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Calls.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Evangelos Ribeiro Tzaras <evangelos.tzaras@puri.sm>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ */
+
+#include "gst-rfc3551.h"
+
+#include <glib.h>
+
+/* TODO check available codecs during runtime */
+static MediaCodecInfo gst_codecs[] = {
+  {0, "PCMU", 8000, 1, "rtppcmupay", "rtppcmudepay", "mulawenc", "mulawdec"},
+  {3, "GSM", 8000, 1, "rtpgsmpay", "rtpgsmdepay", "gsmenc", "gsmdec"},
+  {4, "G723", 8000, 1, "rtpg723pay", "rtpg723depay", "avenc_g723_1", "avdec_g723_1"}, // does not seem to work
+  {8, "PCMA", 8000, 1, "rtppcmapay", "rtppcmadepay", "alawenc", "alawdec"},
+  {9, "G722", 8000, 1, "rtpg722pay", "rtpg722depay", "avenc_g722", "avdec_g722"},
+};
+
+
+
+MediaCodecInfo *
+media_codec_by_name (const char *name)
+{
+  g_return_val_if_fail (name != NULL, NULL);
+
+  for (guint i = 0; i < G_N_ELEMENTS (gst_codecs); i++) {
+    if (g_strcmp0 (name, gst_codecs[i].name) == 0)
+      return &gst_codecs[i];
+  }
+
+  return NULL;
+}
+
+gchar *
+media_codec_get_gst_capabilities (MediaCodecInfo *codec)
+{
+  return g_strdup_printf ("application/x-rtp,media=(string)audio,clock-rate=(int)%d"
+                          ",encoding-name=(string)%s,payload=(int)%d",
+                          codec->clock_rate,
+                          codec->name,
+                          codec->payload_type);
+}