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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2021 Sara Cinzia Halter, Naoki Pross.
import socket
from urllib.parse import urlparse
import numpy as np
from gnuradio import gr
class netsink(gr.sync_block):
"""
Sink that sends the data over the network using UDP.
Keep in mind that is quite slow.
"""
def __init__(self, address, dtype, vlen):
to_numpy = {
"complex": np.complex64,
"float": np.float32,
"int": np.int32,
"short": np.short,
"byte": np.byte,
}
dt = to_numpy[dtype]
if vlen > 1:
dt = np.dtype(dt, (vlen,))
print(dt)
gr.sync_block.__init__(self,
name="Network Sink",
in_sig=[dt],
out_sig=None)
# Create a socket and parse remote machine url
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.url = urlparse(address)
self.srv = (self.url.hostname, self.url.port)
def send(self, data):
"""
Send the data to self.srv
@param data Data as python bytes
@return Number of bytes that were actually sent
"""
assert type(data) == bytes
return self.socket.sendto(data, self.srv)
def encode(self, data):
"""
Encode the data into a dead simple format
@param data Array like type
@return Bytes of ASCII encoded comma separated string of numbers
"""
# FIXME: this could be (very) slow, is there a faster way with numpy?
# Maybe numpy.array2string
values = "[" + ",".join(map(str, data)) + "]"
return bytes(values, "ascii")
def work(self, input_items, output_items):
# FIXME: it is probably better NOT to send *every* sample
inp = input_items[0]
inp_len = len(inp)
blocksize = 1024
# Check that the packet is not huge
if len(inp) < blocksize:
self.send(self.encode(inp))
else:
# compute how to split inp into blocks
nblocks = inp_len // blocksize
index = blocksize * nblocks
# send blocks
blocks = np.array(inp[:index]).reshape((blocksize, nblocks))
for block in blocks:
self.send(self.encode(block))
# sent the rest
self.send(self.encode(inp[index:]))
return len(inp)
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