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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2019, 2022 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
from gnuradio import gr, blocks
if gr.api_version() != '9':
from gnuradio import network
from ...utils.options_block import options_block
from ...grtypes import byte_t
class codec2_udp_sink(gr.hier_block2, options_block):
"""
Hierarchical block for Codec2 UDP output
The input are PDUs with Codec2 data
The Codec2 data is sent to by PDU, a single frame (7 bytes)
per packet for lowest latency.
Args:
ip: Detination IP (string)
port: Destination UDP port (int)
"""
def __init__(self, ip=None, port=None, options=None):
gr.hier_block2.__init__(
self,
'codec2_udp_sink',
gr.io_signature(0, 0, 0),
gr.io_signature(0, 0, 0))
options_block.__init__(self, options)
self.message_port_register_hier_in('in')
if ip is None:
ip = self.options.codec2_ip
if port is None:
port = self.options.codec2_port
self.pdu2tag = blocks.pdu_to_tagged_stream(byte_t, 'packet_len')
payload_bytes = 7
# The UDP sink has been moved in GNU Radio 3.10
if gr.api_version() == '9':
self.udp = blocks.udp_sink(
gr.sizeof_char*1, ip, port, payload_bytes, False)
else:
udp_header = 0 # no header
# The new UDP sink requires at least 8 bytes of payload.
# We use 14 bytes, which is 2 codec2 frames.
payload_bytes = 14
self.udp = network.udp_sink(gr.sizeof_char, 1,
ip, port, udp_header,
payload_bytes, False)
self.msg_connect((self, 'in'), (self.pdu2tag, 'pdus'))
self.connect(self.pdu2tag, self.udp)
_default_ip = '127.0.0.1'
_default_port = 7000
@classmethod
def add_options(cls, parser):
"""
Adds Codec2 UDP output specific options to the argparse parser
"""
parser.add_argument(
'--codec2_ip', type=str, default=cls._default_ip,
help='Codec2 output IP [default=%(default)r]')
parser.add_argument(
'--codec2_port', type=int, default=cls._default_port,
help='Codec2 output UDP port [default=%(default)r]')
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