Add SDP translator and PJMEDIA implementation.

This creates the following:
* Asterisk's internal representation of an SDP
* An API for translating SDPs from one format to another
* An implementation of a translator for PJMEDIA

Change-Id: Ie2ecd3cbebe76756577be9b133e84d2ee356d46b

1 files changed, 111 insertions, 0 deletions

diff --git a/main/sdp_repr.c b/main/sdp_repr.c
new file mode 100644
index 000000000..6df243b0e
--- /dev/null
+++ b/main/sdp_repr.c
@@ -0,0 +1,111 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2017, Digium, Inc.
+ *
+ * Mark Michelson <mmichelson@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+#include "asterisk.h"
+#include "asterisk/sdp_priv.h"
+#include "asterisk/utils.h"
+
+struct ast_sdp *ast_sdp_alloc(void)
+{
+	struct ast_sdp *new_sdp;
+
+	new_sdp = ast_calloc(1, sizeof *new_sdp);
+	return new_sdp;
+}
+
+static void free_o_line(struct ast_sdp *dead)
+{
+	ast_free(dead->o_line.user);
+	ast_free(dead->o_line.family);
+	ast_free(dead->o_line.addr);
+}
+
+static void free_s_line(struct ast_sdp *dead)
+{
+	ast_free(dead->s_line);
+}
+
+static void free_c_line(struct ast_sdp_c_line *c_line)
+{
+	ast_free(c_line->family);
+	ast_free(c_line->addr);
+}
+
+static void free_t_line(struct ast_sdp_t_line *t_line)
+{
+	return;
+}
+
+static void free_a_line(struct ast_sdp_a_line *a_line)
+{
+	ast_free(a_line->name);
+	ast_free(a_line->value);
+}
+
+static void free_a_lines(struct ast_sdp_a_line_vector *a_lines)
+{
+	int i;
+
+	for (i = 0; i < AST_VECTOR_SIZE(a_lines); ++i) {
+		free_a_line(AST_VECTOR_GET_ADDR(a_lines, i));
+	}
+	AST_VECTOR_FREE(a_lines);
+}
+
+static void free_m_line(struct ast_sdp_m_line *m_line)
+{
+	int i;
+
+	ast_free(m_line->type);
+	ast_free(m_line->profile);
+	free_c_line(&m_line->c_line);
+
+	for (i = 0; i < AST_VECTOR_SIZE(&m_line->payloads); ++i) {
+		ast_free(AST_VECTOR_GET(&m_line->payloads, i));
+	}
+	AST_VECTOR_FREE(&m_line->payloads);
+
+	free_a_lines(&m_line->a_lines);
+}
+
+static void free_m_lines(struct ast_sdp *dead)
+{
+	int i;
+
+	for (i = 0; i < AST_VECTOR_SIZE(&dead->m_lines); ++i) {
+		free_m_line(AST_VECTOR_GET_ADDR(&dead->m_lines, i));
+	}
+
+	AST_VECTOR_FREE(&dead->m_lines);
+}
+
+void ast_sdp_free(struct ast_sdp *dead)
+{
+	if (!dead) {
+		return;
+	}
+
+	free_o_line(dead);
+	free_s_line(dead);
+	free_c_line(&dead->c_line);
+	free_t_line(&dead->t_line);
+	free_a_lines(&dead->a_lines);
+	free_m_lines(dead);
+	ast_free(dead);
+}
+