#!/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()