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
diff --git a/include/osmocom/gsm/gsm0808_utils.h b/include/osmocom/gsm/gsm0808_utils.h
index 5fc1c88..b5ddbdb 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 @@
/* 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);
diff --git a/include/osmocom/gsm/protocol/gsm_08_08.h b/include/osmocom/gsm/protocol/gsm_08_08.h
index 6fb4e9e..3e5514d 100644
--- a/include/osmocom/gsm/protocol/gsm_08_08.h
+++ b/include/osmocom/gsm/protocol/gsm_08_08.h
@@ -3,6 +3,9 @@
#pragma once
#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <osmocom/core/linuxlist.h>
/*
* this is from GSM 03.03 CGI but is copied in GSM 08.08
@@ -416,3 +419,22 @@
GSM0808_PAGINF_FOR_SMS = 0x01,
GSM0808_PAGINF_FOR_USSD = 0x02,
};
+
+/* 3GPP TS 48.008 3.2.2.104 Speech Codec */
+struct gsm0808_speech_codec {
+ bool fi;
+ bool pi;
+ bool pt;
+ bool tf;
+ uint8_t type;
+ uint16_t cfg;
+ bool type_extended;
+ bool cfg_present;
+};
+
+/* 3GPP TS 48.008 3.2.2.103 Speech Codec List */
+#define SPEECH_CODEC_MAXLEN 255
+struct gsm0808_speech_codec_list {
+ struct gsm0808_speech_codec codec[SPEECH_CODEC_MAXLEN];
+ uint8_t len;
+};