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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2021 Naoki Pross.
import io
import numpy as np
from gnuradio import gr
class datasource(gr.sync_block):
"""
Loads data from a file choosen in the graphical user interface.
"""
HEADER_LEN = 11;
def __init__(self, vec_len, header_len, sock_addr, file_list):
# FIXME: find a better solution
assert(header_len == datasource.HEADER_LEN)
gr.sync_block.__init__(self,
name="datasource",
in_sig=None,
out_sig=[np.dtype(f'{vec_len + header_len}b')])
# parameters
self.vec_len = vec_len
self.sock_addr = sock_addr
self.file_list = file_list
# file members
self.fdata = None
self.fsize = None
self.fpos = 0
# cache
self.header_cache = None
# TODO: make it possible to choose from UI
self.load_file(file_list[0])
def load_file(self, fname):
self.fdata = np.fromfile(fname, np.byte)
self.fsize = len(self.fdata)
# TODO: remove debugging statements or create logger
print(f"datasource: loaded file size={self.fsize}, head:")
print(self.fdata[:10])
def make_header(self, data_size):
# TODO: check that data_size is not too big
pilot = 0x1248
# TODO: implement hamming code for header
header = f"p{pilot:04x}s{data_size:04x}d".encode("ascii")
arr = np.frombuffer(header, dtype=np.dtype("byte"))
return arr
def work(self, input_items, output_items):
out = output_items[0]
if self.fpos + self.vec_len > self.fsize:
# FIXME: repair broken code below
# TODO: create logger
print(f"WARNING: the last {self.fsize - self.fpos} bytes were not sent!")
self.fpos = 0
return 0;
rest = self.fsize - self.fpos
# cannot use cached header
header = self.make_header(rest)
data = self.fdata[self.fpos:rest]
frame_size = datasource.HEADER_LEN + rest
out[:] = np.concatenate([header, data])
self.fpos = 0
return rest
# cache header if not saved
if self.header_cache == None:
self.header = self.make_header(self.vec_len)
data = self.fdata[self.fpos:self.fpos + self.vec_len]
out[:] = np.concatenate([self.header, data])
self.fpos += self.vec_len
return len(output_items[0])
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