ctest for parallel Rx, that includes some channel noise and sample clock offset

Author: drowe67

CMakeLists.txt

@@ -1206,6 +1206,14 @@ endif(NOT APPLE)
                             cat binaryIn.bin | ./demo/freedv_datac1_tx | 
                             ./demo/freedv_datac1_rx > binaryOut.bin;
                             diff binaryIn.bin binaryOut.bin")
- 
+
+      # test Rx of two modes in parallel, with AWGN noise and sample clock offsets
+      add_test(NAME test_demo_datac0c1
+             COMMAND sh -c "cd ${CMAKE_CURRENT_BINARY_DIR};
+                            ./demo/freedv_datac0c1_tx | 
+                            ./src/cohpsk_ch - - -24 -f 20 --Fs 8000 | 
+                            sox -t .s16 -c 1 -r 8000 - -t .s16 -c 1 -r 8008 - | 
+                            ./demo/freedv_datac0c1_rx")
+           set_tests_properties(test_demo_datac0c1 PROPERTIES PASS_REGULAR_EXPRESSION "DATAC0 Frames: 10 DATAC1 Frames: 10")
 
 endif(UNITTEST)

demo/freedv_datac0c1_rx.c

@@ -10,9 +10,20 @@
   - the ability to receive signalling as well as payload data frames.
 
   usage: 
+
   cd codec2/build_linux
   ./demo/freedv_datacc01_tx | ./demo/freedv_datac0c1_rx
-  
+
+  Give it a hard time with some channel noise, frequency offset, and sample 
+  clock offsets:
+
+  ./demo/freedv_datac0c1_tx | ./src/cohpsk_ch - - -24 -f 20 --Fs 8000 | 
+  sox -t .s16 -c 1 -r 8000 - -t .s16 -c 1 -r 8008 - | 
+  ./demo/freedv_datac0c1_rx
+
+  Replace the final line with "aplay -f S16" to listen to the
+  simulated Rx signal.
+
 \*---------------------------------------------------------------------------*/
 
 /*
@@ -87,8 +98,8 @@ int main(int argc, char *argv[]) {
 
     }
 
-    fprintf(stderr, "DATAC0 Frames: %d\n", c0_frames);
-    fprintf(stderr, "DATAC1 Frames: %d\n", c1_frames);
+    fprintf(stderr, "DATAC0 Frames: %d DATAC1 Frames: %d\n", c0_frames, c1_frames);
+
     freedv_close(freedv_c0);
     freedv_close(freedv_c1);
 

demo/freedv_datac0c1_tx.c

@@ -34,6 +34,8 @@
 #include "freedv_api.h"
 #include "ofdm_internal.h"
 
+#define FRAMES 10
+
 void send_burst(struct freedv *freedv);
 
 int main(void) {
@@ -42,9 +44,21 @@ int main(void) {
     freedv_c0 = freedv_open(FREEDV_MODE_DATAC0); assert(freedv_c0 != NULL);
     freedv_c1 = freedv_open(FREEDV_MODE_DATAC1); assert(freedv_c1 != NULL);
 
-    for(int b=0; b<10; b++) {
-        send_burst(freedv_c0);
-        send_burst(freedv_c1);
+    // send frames in different modes in random order
+    int c0_frames = 0;
+    int c1_frames = 0;
+    while ((c0_frames < FRAMES) || (c1_frames < FRAMES)) {
+        if (rand() & 1) {
+            if (c0_frames < FRAMES) {
+                send_burst(freedv_c0);
+                c0_frames++;
+            }
+        } else { 
+            if (c1_frames < FRAMES) {
+                send_burst(freedv_c1);
+                c1_frames++;
+            }
+        }
     }
 
     freedv_close(freedv_c0);