gsm0808: Add utils for Speech Codec List and Speech Codec

The planned support for true A over IP requires the encoding and
decoding of a so called "Speech Codec Element" element.

This commt adds parsing functionality and tests for the element
mentioned above, however, it is not yet actively used.

Change-Id: I0e1e2edf47adaa45b22d4b0bcae3640dba7ca200

1 files changed, 19 insertions, 0 deletions

diff --git a/include/osmocom/gsm/gsm0808_utils.h b/include/osmocom/gsm/gsm0808_utils.h
index 5fc1c880..b5ddbdb7 100644
--- a/include/osmocom/gsm/gsm0808_utils.h
+++ b/include/osmocom/gsm/gsm0808_utils.h
@@ -21,6 +21,8 @@
 
 #include <sys/socket.h>
 
+#include <osmocom/gsm/protocol/gsm_08_08.h>
+
 /* Encode AoIP transport address element */
 uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg,
 				    const struct sockaddr_storage *ss);
@@ -28,3 +30,20 @@ uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg,
 /* Decode AoIP transport address element */
 int gsm0808_dec_aoip_trasp_addr(struct sockaddr_storage *ss,
 				const uint8_t *elem, uint8_t len);
+
+/* Encode Speech Codec element */
+uint8_t gsm0808_enc_speech_codec(struct msgb *msg,
+				 const struct gsm0808_speech_codec *sc);
+
+/* Decode Speech Codec element */
+int gsm0808_dec_speech_codec(struct gsm0808_speech_codec *sc,
+			     const uint8_t *elem, uint8_t len);
+
+/* Encode Speech Codec list */
+uint8_t gsm0808_enc_speech_codec_list(struct msgb *msg,
+				      const struct gsm0808_speech_codec_list
+				      *scl);
+
+/* Decode Speech Codec list */
+int gsm0808_dec_speech_codec_list(struct gsm0808_speech_codec_list *scl,
+				  const uint8_t *elem, uint8_t len);