mbedtls_ssl_get_srtp_profile_as_string declared and defined in ssl.h

Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 066522f..d0007fc 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -3184,6 +3184,24 @@
 #endif /* MBEDTLS_SSL_ALPN */
 
 #if defined(MBEDTLS_SSL_DTLS_SRTP)
+#if defined(MBEDTLS_DEBUG_C)
+static inline const char *mbedtls_ssl_get_srtp_profile_as_string ( mbedtls_ssl_srtp_profile profile )
+{
+    switch( profile )
+    {
+        case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80:
+            return "MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80";
+        case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32:
+            return "MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32";
+        case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80:
+            return "MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80";
+        case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32:
+            return "MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32";
+        default: break;
+    }
+    return( "" );
+}
+#endif /* MBEDTLS_DEBUG_C */
 /**
  * \brief                   Manage support for mki(master key id) value
  *                          in use_srtp extension.