Finalize test-case-4-run.py

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

README.md

@@ -111,7 +111,7 @@ can install some tools that will be used in the next steps:
 $ sudo apt update
 $ sudo apt install alsa-utils pulseaudio-utils \
                    pipewire-jack sndfile-tools \
-                   psmisc graphviz python3
+                   psmisc graphviz python3 python3-matplotlib
 ```
 - **alsa-utils** will be used to test sound cards directly using ALSA.
 - **pulseaudio-utils** gives us `pactl` to check if pipewire is running.
@@ -124,6 +124,7 @@ $ sudo apt install alsa-utils pulseaudio-utils \
 - **graphviz** provides `dot` which can convert dot files generated by `pw-dot`
      into png files to represent the PipeWire graph.
 - **python3** to execute python test scripts.
+- **python3-matplotlib** to generate graph from results.
 
 
 If the linux kernel is recent enough, you should have sound cards registrered:

scripts/test-case-4-run.py

 #!/usr/bin/env python3
 
+from statistics import mean
+import matplotlib.pyplot as plt
 import json
 import os
 import signal
@@ -78,32 +80,45 @@ if __name__ == "__main__":
     # my_wav = "/usr/share/sounds/alsa/Front_Center.wav" # duration of 1.428 sec, checked with Audacity
 
     # Generate different batches of sndfile-jackplay
-    for nb_play in list(range(1, 60, 10)):
-      # To avoid interference from previous run
-      kill_my_sinks()
-      time.sleep(2) # Wait 2 sec to be sure all sndfile-jackplay are killed
-
-      print(f"\nStarting {nb_play} sndfile-jackplay")
-      start_jackplay_loop(my_wav_loop)
-      for nb_play_i in list(range(2, nb_play)):
+    my_batches = list(range(1, 60, 10))
+    my_results = {new_list: [] for new_list in my_batches}
+    for nb_play in my_batches:
+      for run in range(1,11):
+        # To avoid interference from previous run
+        kill_my_sinks()
+        time.sleep(2) # Wait 2 sec to be sure all sndfile-jackplay are killed
+
+        print(f"\nStarting {nb_play} sndfile-jackplay")
         start_jackplay_loop(my_wav_loop)
-      time.sleep(2) # Wait 2 sec to be sure all sndfile-jackplay are running
-      print("Everything is ready for testing!")
-      print("A new sndfile-jackplay will be run and time required will be measured")
-      print("Press any key to start the test...")
-      input()
-
-      t_start = time.time()
-      start_jackplay(my_wav)
-      t_end = time.time()
-      required_time = t_end - t_start
+        for nb_play_i in list(range(2, nb_play)):
+          start_jackplay_loop(my_wav_loop)
+        time.sleep(2) # Wait 2 sec to be sure all sndfile-jackplay are running
+        print("Everything is ready for testing!")
+        print("A new sndfile-jackplay will be run and time required will be measured")
+        #print("Press any key to start the test...")
+        #input()
+
+        t_start = time.time()
+        start_jackplay(my_wav)
+        t_end = time.time()
+        required_time = t_end - t_start
+        my_results[nb_play].append(required_time)
+
+        print(f"With {nb_play} running, it tooks {required_time} " +
+               "to connect and play the sound")
 
-      print(f"With {nb_play} running, it tooks {required_time} " +
-             "to connect and play the sound")
-
-    kill_my_sinks()
+      kill_my_sinks()
 
-    # TODO generate a graph of required_time
+    # Generate a graph of required_time
+    x=list(my_results.keys())
+    y=[]
+    for run in my_batches:
+      y.append(mean(my_results[run]))
+    plt.plot(x,y)
+    plt.xlabel('Already running sndfile-jackplay')
+    plt.ylabel('Time to play a new sound')
+    plt.title("Test case 4")
+    plt.savefig('test_case_4_plot.png')
 
     # End of test case 4
     print("End of test-case 4")