FreeDATA/test/test_multimode_tx.py

188 lines
6.3 KiB
Python

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import argparse
import ctypes
import sys
import time
import numpy as np
import pyaudio
sys.path.insert(0, "..")
from tnc import codec2
def test_mm_tx():
# AUDIO PARAMETERS
AUDIO_FRAMES_PER_BUFFER = 2400
MODEM_SAMPLE_RATE = codec2.api.FREEDV_FS_8000
AUDIO_SAMPLE_RATE_TX = 48000
assert (AUDIO_SAMPLE_RATE_TX % MODEM_SAMPLE_RATE) == 0
args = parse_arguments()
if args.LIST:
p_audio = pyaudio.PyAudio()
for dev in range(p_audio.get_device_count()):
print("audiodev: ", dev, p_audio.get_device_info_by_index(dev)["name"])
sys.exit()
N_BURSTS = args.N_BURSTS
N_FRAMES_PER_BURST = args.N_FRAMES_PER_BURST
DELAY_BETWEEN_BURSTS = args.DELAY_BETWEEN_BURSTS / 1000
AUDIO_OUTPUT_DEVICE = args.AUDIO_OUTPUT_DEVICE
resampler = codec2.resampler()
# Data binary string
data_out = b"HELLO WORLD!"
modes = [
codec2.api.FREEDV_MODE_DATAC0,
codec2.api.FREEDV_MODE_DATAC1,
codec2.api.FREEDV_MODE_DATAC3,
]
if AUDIO_OUTPUT_DEVICE != -1:
p_audio = pyaudio.PyAudio()
# Auto search for loopback devices
if AUDIO_OUTPUT_DEVICE == -2:
loopback_list = [
dev
for dev in range(p_audio.get_device_count())
if "Loopback: PCM" in p_audio.get_device_info_by_index(dev)["name"]
]
if len(loopback_list) >= 2:
AUDIO_OUTPUT_DEVICE = loopback_list[1] # 0 = RX 1 = TX
print(f"loopback_list tx: {loopback_list}", file=sys.stderr)
else:
sys.exit()
# pyaudio init
stream_tx = p_audio.open(
format=pyaudio.paInt16,
channels=1,
rate=AUDIO_SAMPLE_RATE_TX,
frames_per_buffer=AUDIO_FRAMES_PER_BUFFER, # n_nom_modem_samples
output=True,
output_device_index=AUDIO_OUTPUT_DEVICE,
)
for mode in modes:
freedv = ctypes.cast(codec2.api.freedv_open(mode), ctypes.c_void_p)
n_tx_modem_samples = codec2.api.freedv_get_n_tx_modem_samples(freedv)
mod_out = ctypes.create_string_buffer(2 * n_tx_modem_samples)
n_tx_preamble_modem_samples = codec2.api.freedv_get_n_tx_preamble_modem_samples(
freedv
)
mod_out_preamble = ctypes.create_string_buffer(2 * n_tx_preamble_modem_samples)
n_tx_postamble_modem_samples = (
codec2.api.freedv_get_n_tx_postamble_modem_samples(freedv)
)
mod_out_postamble = ctypes.create_string_buffer(
2 * n_tx_postamble_modem_samples
)
bytes_per_frame = int(codec2.api.freedv_get_bits_per_modem_frame(freedv) / 8)
payload_per_frame = bytes_per_frame - 2
buffer = bytearray(payload_per_frame)
# Set buffer size to length of data which will be sent
buffer[: len(data_out)] = data_out
# Generate CRC16
crc = ctypes.c_ushort(
codec2.api.freedv_gen_crc16(bytes(buffer), payload_per_frame)
)
# Convert CRC to 2 byte hex string
crc = crc.value.to_bytes(2, byteorder="big")
buffer += crc # Append crc16 to buffer
data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
for brst in range(1, N_BURSTS + 1):
# Write preamble to txbuffer
codec2.api.freedv_rawdatapreambletx(freedv, mod_out_preamble)
txbuffer = bytes(mod_out_preamble)
# Create modulaton for N = FRAMESPERBURST and append it to txbuffer
for frm in range(1, N_FRAMES_PER_BURST + 1):
data = (ctypes.c_ubyte * bytes_per_frame).from_buffer_copy(buffer)
# Modulate DATA and save it into mod_out pointer
codec2.api.freedv_rawdatatx(freedv, mod_out, data)
txbuffer += bytes(mod_out)
print(
f"TX BURST: {brst}/{N_BURSTS} FRAME: {frm}/{N_FRAMES_PER_BURST}",
file=sys.stderr,
)
# Append postamble to txbuffer
codec2.api.freedv_rawdatapostambletx(freedv, mod_out_postamble)
txbuffer += bytes(mod_out_postamble)
# Append a delay between bursts as audio silence
samples_delay = int(MODEM_SAMPLE_RATE * DELAY_BETWEEN_BURSTS)
mod_out_silence = ctypes.create_string_buffer(samples_delay * 2)
txbuffer += bytes(mod_out_silence)
# Resample up to 48k (resampler works on np.int16)
audio_buffer = np.frombuffer(txbuffer, dtype=np.int16)
txbuffer_48k = resampler.resample8_to_48(audio_buffer)
# Check if we want to use an audio device or stdout
if AUDIO_OUTPUT_DEVICE != -1:
stream_tx.write(txbuffer_48k.tobytes())
else:
# This test needs a lot of time, so we are having a look at times...
starttime = time.time()
# Print data to terminal for piping the output to other programs
sys.stdout.buffer.write(txbuffer_48k)
sys.stdout.flush()
# and at least print the needed time to see which time we needed
timeneeded = time.time() - starttime
# print(f"time: {timeneeded} buffer: {len(txbuffer)}", file=sys.stderr)
# and at last check if we had an opened pyaudio instance and close it
if AUDIO_OUTPUT_DEVICE != -1:
time.sleep(stream_tx.get_output_latency())
stream_tx.stop_stream()
stream_tx.close()
p_audio.terminate()
def parse_arguments():
# GET PARAMETER INPUTS
parser = argparse.ArgumentParser(description="FreeDATA 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("--delay", dest="DELAY_BETWEEN_BURSTS", default=500, type=int)
parser.add_argument(
"--audiodev",
dest="AUDIO_OUTPUT_DEVICE",
default=-1,
type=int,
help="audio output device number to use",
)
parser.add_argument(
"--list",
dest="LIST",
action="store_true",
help="list audio devices by number and exit",
)
args, _ = parser.parse_known_args()
return args
if __name__ == "__main__":
test_mm_tx()