1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/* -*- c++ -*- */
/*
* Copyright 2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "async_encoder_impl.h"
#include <gnuradio/io_signature.h>
#include <gnuradio/logger.h>
#include <volk/volk.h>
#include <boost/format.hpp>
namespace gr {
namespace fec {
async_encoder::sptr async_encoder::make(generic_encoder::sptr my_encoder,
bool packed,
bool rev_unpack,
bool rev_pack,
int mtu)
{
return gnuradio::make_block_sptr<async_encoder_impl>(
my_encoder, packed, rev_unpack, rev_pack, mtu);
}
async_encoder_impl::async_encoder_impl(generic_encoder::sptr my_encoder,
bool packed,
bool rev_unpack,
bool rev_pack,
int mtu)
: block("async_encoder", io_signature::make(0, 0, 0), io_signature::make(0, 0, 0)),
d_unpack(8),
d_pack(8)
{
d_in_port = pmt::mp("in");
d_out_port = pmt::mp("out");
d_encoder = my_encoder;
d_packed = packed;
d_rev_unpack = rev_unpack;
d_rev_pack = rev_pack;
d_mtu = mtu;
message_port_register_in(d_in_port);
message_port_register_out(d_out_port);
if (d_packed) {
set_msg_handler(d_in_port, [this](pmt::pmt_t msg) { this->encode_packed(msg); });
int max_bits_out = d_encoder->rate() * d_mtu * 8;
d_bits_out.resize(max_bits_out);
} else {
set_msg_handler(d_in_port,
[this](pmt::pmt_t msg) { this->encode_unpacked(msg); });
}
if (d_packed || (strncmp(d_encoder->get_input_conversion(), "pack", 4) == 0)) {
// encode_unpacked: Holds packed bits in when input conversion is packed
// encode_packed: holds the output bits of the encoder to be packed
int max_bits_in = d_mtu * 8;
d_bits_in.resize(max_bits_in);
}
}
async_encoder_impl::~async_encoder_impl() {}
void async_encoder_impl::encode_unpacked(pmt::pmt_t msg)
{
// extract input pdu
pmt::pmt_t meta(pmt::car(msg));
pmt::pmt_t bits(pmt::cdr(msg));
size_t o0 = 0;
int nbits_in = pmt::length(bits);
if (nbits_in > (d_mtu * 8)) {
throw std::runtime_error("async_encoder: received message larger than the MTU.");
}
const uint8_t* bits_in = pmt::u8vector_elements(bits, o0);
bool variable_framesize = d_encoder->set_frame_size(nbits_in);
int nbits_out = 0;
int nblocks = 1;
if (variable_framesize) {
nbits_out = d_encoder->get_output_size();
} else {
nblocks = nbits_in / d_encoder->get_input_size();
if (nblocks * d_encoder->get_input_size() != nbits_in) {
GR_LOG_ERROR(
d_logger,
boost::format("nblocks: %u, in_block_size: %d, got_input_size: %d") %
nblocks % d_encoder->get_input_size() % nbits_in);
throw std::runtime_error("input does not divide into code block size!");
}
nbits_out = nblocks * d_encoder->get_output_size();
}
// buffers for output bits to go to
pmt::pmt_t outvec = pmt::make_u8vector(nbits_out, 0x00);
uint8_t* bits_out = pmt::u8vector_writable_elements(outvec, o0);
if (strncmp(d_encoder->get_input_conversion(), "pack", 4) == 0) {
d_pack.pack(d_bits_in.data(), bits_in, nbits_in / 8);
d_encoder->generic_work((void*)d_bits_in.data(), (void*)bits_out);
} else {
for (int i = 0; i < nblocks; i++) {
d_encoder->generic_work((void*)&bits_in[i * d_encoder->get_input_size()],
(void*)&bits_out[i * d_encoder->get_output_size()]);
}
}
pmt::pmt_t msg_pair = pmt::cons(meta, outvec);
message_port_pub(d_out_port, msg_pair);
}
void async_encoder_impl::encode_packed(pmt::pmt_t msg)
{
// extract input pdu
pmt::pmt_t meta(pmt::car(msg));
pmt::pmt_t bytes(pmt::cdr(msg));
size_t o0 = 0;
int nbytes_in = pmt::length(bytes);
if (nbytes_in > d_mtu) {
throw std::runtime_error("async_encoder: received message larger than the MTU.");
}
int nbits_in = 8 * nbytes_in;
const uint8_t* bytes_in = pmt::u8vector_elements(bytes, o0);
d_encoder->set_frame_size(nbits_in);
int nbits_out = d_encoder->get_output_size();
int nbytes_out = nbits_out / 8;
if (strncmp(d_encoder->get_input_conversion(), "pack", 4) == 0) {
// If the input takes packed, anyways, don't go through the
// unpacker. Note that if we need the unpacking to reverse,
// we won't get that here and might have to correct for it in
// the decoder.
// d_bits_in > bytes_in, so we're abusing the existence of
// this allocated memory here
memcpy(d_bits_in.data(), bytes_in, nbytes_in * sizeof(uint8_t));
} else {
// Encoder takes a stream of bits, but PDU's are received as
// bytes, so we unpack them here.
if (d_rev_unpack)
d_unpack.unpack_rev(d_bits_in.data(), bytes_in, nbytes_in);
else
d_unpack.unpack(d_bits_in.data(), bytes_in, nbytes_in);
}
// buffers for output bytes to go to
pmt::pmt_t outvec = pmt::make_u8vector(nbytes_out, 0x00);
uint8_t* bytes_out = pmt::u8vector_writable_elements(outvec, o0);
// ENCODE!
d_encoder->generic_work((void*)d_bits_in.data(), (void*)d_bits_out.data());
if (d_rev_pack)
d_pack.pack_rev(bytes_out, d_bits_out.data(), nbytes_out);
else
d_pack.pack(bytes_out, d_bits_out.data(), nbytes_out);
pmt::pmt_t msg_pair = pmt::cons(meta, outvec);
message_port_pub(d_out_port, msg_pair);
}
int async_encoder_impl::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
return noutput_items;
}
} /* namespace fec */
} /* namespace gr */
|
