AMR: Add function to convert between bw-effient and octet aligned mode
RFC3267 specifies two framing modes for AMR packets. An octet aligned
mode is specified where all fields of the AMR packets are aligned to
octet boundaries. The second framing mode is the bandwith efficient mode
where the fields are directly packed one after another.
- add paring/generation functions for related SDP fmtp parameters
- add conversion function to convert AMR payload
Depends: libosmo-netif I5b5a0fa644d8dbb1f04f9d7e35312683c7b3d196
Change-Id: I622c01874b25f5049d4f59eb8157e0ea3cbe16ba
Related: OS#3807
diff --git a/include/osmocom/mgcp/mgcp_codec.h b/include/osmocom/mgcp/mgcp_codec.h
index 334913b..2bbb86e 100644
--- a/include/osmocom/mgcp/mgcp_codec.h
+++ b/include/osmocom/mgcp/mgcp_codec.h
@@ -2,6 +2,6 @@
void mgcp_codec_summary(struct mgcp_conn_rtp *conn);
void mgcp_codec_reset_all(struct mgcp_conn_rtp *conn);
-int mgcp_codec_add(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name);
+int mgcp_codec_add(struct mgcp_conn_rtp *conn, int payload_type, const char *audio_name, struct mgcp_codec_param *param);
int mgcp_codec_decide(struct mgcp_conn_rtp *conn);
int mgcp_codec_pt_translate(struct mgcp_conn_rtp *conn_src, struct mgcp_conn_rtp *conn_dst, int payload_type);
diff --git a/include/osmocom/mgcp/mgcp_common.h b/include/osmocom/mgcp/mgcp_common.h
index a658f1c..75d5a37 100644
--- a/include/osmocom/mgcp/mgcp_common.h
+++ b/include/osmocom/mgcp/mgcp_common.h
@@ -57,6 +57,12 @@
MGCP_X_OSMO_IGN_CALLID = 1,
};
+/* Codec parameters (communicated via SDP/fmtp) */
+struct mgcp_codec_param {
+ bool amr_octet_aligned_present;
+ bool amr_octet_aligned;
+};
+
/* Ensure that the msg->l2h is NUL terminated. */
static inline int mgcp_msg_terminate_nul(struct msgb *msg)
{
diff --git a/include/osmocom/mgcp/mgcp_internal.h b/include/osmocom/mgcp/mgcp_internal.h
index 35b535a..ec94584 100644
--- a/include/osmocom/mgcp/mgcp_internal.h
+++ b/include/osmocom/mgcp/mgcp_internal.h
@@ -95,6 +95,9 @@
int payload_type;
char *audio_name;
char *subtype_name;
+
+ bool param_present;
+ struct mgcp_codec_param param;
};
/* 'mgcp_rtp_end': basically a wrapper around the RTP+RTCP ports */