From 276b510f126367a809758b0a62e277515375d948 Mon Sep 17 00:00:00 2001
From: drowe67 <david@rowetel.com>
Date: Thu, 13 Jul 2023 12:25:12 +0930
Subject: restore C app for Es/No est test

---
 unittest/CMakeLists.txt |  3 +++
 unittest/tesno_est.c    | 31 +++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 unittest/tesno_est.c

diff --git a/unittest/CMakeLists.txt b/unittest/CMakeLists.txt
index 48a4eb8..656afd0 100644
--- a/unittest/CMakeLists.txt
+++ b/unittest/CMakeLists.txt
@@ -118,3 +118,6 @@ target_link_libraries(mksine m)
 
 add_executable(vq_mbest vq_mbest.c)
 target_link_libraries(vq_mbest codec2)
+
+add_executable(tesno_est tesno_est.c)
+target_link_libraries(tesno_est m codec2)
\ No newline at end of file
diff --git a/unittest/tesno_est.c b/unittest/tesno_est.c
new file mode 100644
index 0000000..e198510
--- /dev/null
+++ b/unittest/tesno_est.c
@@ -0,0 +1,31 @@
+/*---------------------------------------------------------------------------*\
+
+  FILE........: tesno_est.c
+  AUTHORS.....: David Rowe
+  DATE CREATED: Mar 2021
+
+  Test for C port of Es/No estimator.
+  
+\*---------------------------------------------------------------------------*/
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+#include "ofdm_internal.h"
+
+int main(int argc, char *argv[])
+{
+    FILE *fin = fopen(argv[1],"rb"); assert(fin != NULL);
+    size_t nsym = atoi(argv[2]); assert(nsym >= 0);
+    complex float rx_sym[nsym];
+    size_t nread = fread(rx_sym, sizeof(complex float), nsym, fin);
+    assert(nread == nsym);
+    fclose(fin);
+    
+    float EsNodB = ofdm_esno_est_calc(rx_sym, nsym);
+    printf("%f\n",EsNodB);
+
+    return 0;
+}
-- 
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