initial callback test

crashes at the moment within resambler

CMakeLists.txt

@@ -89,5 +89,15 @@ add_test(NAME 001_highsnr_virtual3_P_P_MM
                         cd ${CMAKE_CURRENT_SOURCE_DIR}/test/001_highsnr_stdio_audio;
                         ./test_virtual_mm.sh")
        set_tests_properties(001_highsnr_virtual3_P_P_MM PROPERTIES PASS_REGULAR_EXPRESSION "DATAC0: 2/4 DATAC1: 2/4 DATAC3: 2/4")
+
+# let Python do audio I/O via pyaudio callback mode
+add_test(NAME 001_highsnr_virtual4_P_P_SM_CB
+         COMMAND sh -c "export LD_LIBRARY_PATH=${CODEC2_BUILD_DIR}/src;
+                        PATH=$PATH:${CODEC2_BUILD_DIR}/src;
+                        cd ${CMAKE_CURRENT_SOURCE_DIR}/test/001_highsnr_stdio_audio;
+                        ./test_virtual3.sh")
+       set_tests_properties(001_highsnr_virtual4_P_P_SM_CB PROPERTIES PASS_REGULAR_EXPRESSION "RECEIVED BURSTS: 3 RECEIVED FRAMES: 6 RX_ERRORS: 0")
+
+
 endif()
        

test/001_highsnr_stdio_audio/test_callback_rx.py

@@ -0,0 +1,178 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Wed Dec 23 07:04:24 2020
+
+@author: DJ2LS
+"""
+
+import ctypes
+from ctypes import *
+import pathlib
+import pyaudio
+import sys
+import logging
+import time
+import threading
+import sys
+import argparse
+import numpy as np
+sys.path.insert(0,'..')
+import codec2
+
+#--------------------------------------------GET PARAMETER INPUTS  
+parser = argparse.ArgumentParser(description='FreeDATA audio test')
+parser.add_argument('--bursts', dest="N_BURSTS", default=1, type=int)
+parser.add_argument('--framesperburst', dest="N_FRAMES_PER_BURST", default=1, type=int)
+parser.add_argument('--mode', dest="FREEDV_MODE", type=str, choices=['datac0', 'datac1', 'datac3'])
+parser.add_argument('--audiodev', dest="AUDIO_INPUT_DEVICE", default=-1, type=int,
+                    help="audio device number to use, use -2 to automatically select a loopback device")  
+parser.add_argument('--debug', dest="DEBUGGING_MODE", action="store_true")  
+parser.add_argument('--timeout', dest="TIMEOUT", default=10, type=int, help="Timeout (seconds) before test ends")  
+parser.add_argument('--list', dest="LIST", action="store_true", help="list audio devices by number and exit")  
+
+args = parser.parse_args()
+
+if args.LIST:
+    p = pyaudio.PyAudio()
+    for dev in range(0,p.get_device_count()):
+        print("audiodev: ", dev, p.get_device_info_by_index(dev)["name"])
+    quit()
+   
+N_BURSTS = args.N_BURSTS
+N_FRAMES_PER_BURST = args.N_FRAMES_PER_BURST
+AUDIO_INPUT_DEVICE = args.AUDIO_INPUT_DEVICE
+MODE = codec2.FREEDV_MODE[args.FREEDV_MODE].value
+DEBUGGING_MODE = args.DEBUGGING_MODE
+TIMEOUT = args.TIMEOUT
+
+# AUDIO PARAMETERS
+AUDIO_FRAMES_PER_BUFFER = 2400*2  # <- consider increasing if you get nread_exceptions > 0
+MODEM_SAMPLE_RATE = codec2.api.FREEDV_FS_8000
+AUDIO_SAMPLE_RATE_RX = 48000
+
+# make sure our resampler will work
+assert (AUDIO_SAMPLE_RATE_RX / MODEM_SAMPLE_RATE) == codec2.api.FDMDV_OS_48
+
+
+# ------------------------------------------------ PYAUDIO CALLBACK
+def callback(data_in48k, frame_count, time_info, status):
+    x = np.frombuffer(data_in48k, dtype=np.int16)
+    x.tofile(frx)    
+    x = resampler.resample48_to_8(x)
+    audio_buffer.push(x)    
+    return (None, pyaudio.paContinue)
+
+
+# check if we want to use an audio device then do an pyaudio init
+if AUDIO_INPUT_DEVICE != -1: 
+    p = pyaudio.PyAudio()
+    # auto search for loopback devices
+    if AUDIO_INPUT_DEVICE == -2:
+        loopback_list = []
+        for dev in range(0,p.get_device_count()):
+            if 'Loopback: PCM' in p.get_device_info_by_index(dev)["name"]:
+                loopback_list.append(dev)
+        if len(loopback_list) >= 2:
+            AUDIO_INPUT_DEVICE = loopback_list[0] #0  = RX   1 = TX
+            print(f"loopback_list rx: {loopback_list}", file=sys.stderr)
+        else:
+            quit()
+            
+    print(f"AUDIO INPUT DEVICE: {AUDIO_INPUT_DEVICE} DEVICE: {p.get_device_info_by_index(AUDIO_INPUT_DEVICE)['name']}  \
+            AUDIO SAMPLE RATE: {AUDIO_SAMPLE_RATE_RX}", file=sys.stderr)
+    
+    stream_rx = p.open(format=pyaudio.paInt16, 
+                            channels=1,
+                            rate=AUDIO_SAMPLE_RATE_RX,
+                            frames_per_buffer=AUDIO_FRAMES_PER_BUFFER,
+                            input=True,
+                            output=False,
+                            input_device_index=AUDIO_INPUT_DEVICE,
+                            stream_callback=callback
+                            ) 
+    try:                        
+        print(f"starting pyaudio callback", file=sys.stderr)
+        stream_rx.start_stream()
+    except Exception as e:
+        print(f"pyAudio error: {e}", file=sys.stderr)  
+# ----------------------------------------------------------------
+              
+# DATA CHANNEL INITIALISATION
+
+# open codec2 instance        
+freedv = cast(codec2.api.freedv_open(MODE), c_void_p)
+
+# get number of bytes per frame for mode
+bytes_per_frame = int(codec2.api.freedv_get_bits_per_modem_frame(freedv)/8)
+payload_bytes_per_frame = bytes_per_frame -2
+
+n_max_modem_samples = codec2.api.freedv_get_n_max_modem_samples(freedv)     
+bytes_out = create_string_buffer(bytes_per_frame * 2)
+
+codec2.api.freedv_set_frames_per_burst(freedv,N_FRAMES_PER_BURST)
+
+total_n_bytes = 0
+rx_total_frames = 0
+rx_frames = 0
+rx_bursts = 0
+rx_errors = 0
+nread_exceptions = 0
+timeout = time.time() + TIMEOUT
+receive = True
+audio_buffer = codec2.audio_buffer(AUDIO_FRAMES_PER_BUFFER*2)
+resampler = codec2.resampler()
+
+# Copy received 48 kHz to a file.  Listen to this file with:
+#   aplay -r 48000 -f S16_LE rx48_callback.raw
+# Corruption of this file is a good way to detect audio card issues
+frx = open("rx48_callback.raw", mode='wb')    
+
+# initial number of samples we need
+nin = codec2.api.freedv_nin(freedv)
+while receive and time.time() < timeout:
+
+    # when we have enough samples call FreeDV Rx
+    while audio_buffer.nbuffer >= nin:
+
+        # demodulate audio
+        nbytes = codec2.api.freedv_rawdatarx(freedv, bytes_out, audio_buffer.buffer.ctypes)        
+        audio_buffer.pop(nin)
+        
+        # call me on every loop!
+        nin = codec2.api.freedv_nin(freedv)
+       
+        rx_status = codec2.api.freedv_get_rx_status(freedv)       
+        if rx_status & codec2.api.FREEDV_RX_BIT_ERRORS:
+            rx_errors = rx_errors + 1
+        if DEBUGGING_MODE:        
+          rx_status = codec2.api.rx_sync_flags_to_text[rx_status]
+          print("nin: %5d rx_status: %4s naudio_buffer: %4d" % \
+                (nin,rx_status,audio_buffer.nbuffer), file=sys.stderr)
+
+        if nbytes:
+            total_n_bytes = total_n_bytes + nbytes
+            
+            if nbytes == bytes_per_frame:
+                rx_total_frames = rx_total_frames + 1
+                rx_frames = rx_frames + 1
+
+            if rx_frames == N_FRAMES_PER_BURST:
+                rx_frames = 0
+                rx_bursts = rx_bursts + 1
+                          
+            if rx_bursts == N_BURSTS:
+                receive = False
+                
+    if time.time() >= timeout:
+        print("TIMEOUT REACHED")
+     
+if nread_exceptions:
+    print("nread_exceptions %d - receive audio lost! Consider increasing Pyaudio frames_per_buffer..." %  \
+          nread_exceptions, file=sys.stderr)
+print(f"RECEIVED BURSTS: {rx_bursts} RECEIVED FRAMES: {rx_total_frames} RX_ERRORS: {rx_errors}", file=sys.stderr)
+frx.close()
+
+# cloese pyaudio instance
+stream_rx.close()
+p.terminate()

test/001_highsnr_stdio_audio/test_virtual3.sh

@@ -0,0 +1,23 @@
+#!/bin/bash -x
+# Run a test using the virtual sound cards, Python audio I/O
+
+function check_alsa_loopback {
+    lsmod | grep snd_aloop >> /dev/null
+    if [ $? -eq 1 ]; then
+      echo "ALSA loopback device not present.  Please install with:"
+      echo
+      echo "  sudo modprobe snd-aloop index=1,2 enable=1,1 pcm_substreams=1,1 id=CHAT1,CHAT2"
+      exit 1
+    fi  
+}
+
+check_alsa_loopback
+
+# make sure all child processes are killed when we exit
+trap 'jobs -p | xargs -r kill' EXIT
+
+python3 test_callback_rx.py --mode datac0 --frames 2 --bursts 3 --audiodev -2 --debug &
+rx_pid=$!
+#sleep 1
+python3 test_tx.py --mode datac0 --frames 2 --bursts 3 --audiodev -2
+wait ${rx_pid}