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
|
/* ------------------------------------------------------------------
* Copyright (C) 2020 Matthias P. Braendli
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#include "config.h"
#include "PadInterface.h"
#include <stdexcept>
#include <sstream>
#include <cstring>
#include <cerrno>
#include <cassert>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <unistd.h>
#define MESSAGE_REQUEST 1
#define MESSAGE_PAD_DATA 2
using namespace std;
void PadInterface::open(const std::string& pad_ident)
{
m_pad_ident = pad_ident;
m_sock = ::socket(AF_UNIX, SOCK_DGRAM, 0);
if (m_sock == -1) {
throw runtime_error("PAD socket creation failed: " + string(strerror(errno)));
}
int flags = fcntl(m_sock, F_GETFL);
if (flags == -1) {
std::string errstr(strerror(errno));
throw std::runtime_error("PAD socket: Could not get socket flags: " + errstr);
}
if (fcntl(m_sock, F_SETFL, flags | O_NONBLOCK) == -1) {
std::string errstr(strerror(errno));
throw std::runtime_error("PAD socket: Could not set O_NONBLOCK: " + errstr);
}
struct sockaddr_un claddr;
memset(&claddr, 0, sizeof(struct sockaddr_un));
claddr.sun_family = AF_UNIX;
snprintf(claddr.sun_path, sizeof(claddr.sun_path), "/tmp/%s.audioenc", m_pad_ident.c_str());
if (unlink(claddr.sun_path) == -1 and errno != ENOENT) {
fprintf(stderr, "Unlinking of socket %s failed: %s\n", claddr.sun_path, strerror(errno));
}
const auto ret = ::bind(m_sock, (const struct sockaddr *) &claddr, sizeof(struct sockaddr_un));
if (ret == -1) {
throw runtime_error("PAD socket bind failed " + string(strerror(errno)));
}
}
vector<uint8_t> PadInterface::request(uint8_t padlen)
{
if (m_pad_ident.empty()) {
throw logic_error("Uninitialised PadInterface::request() called");
}
// Sending requests allows the PadEnc to know both the padlen, but also
// will allow proper timing.
uint8_t packet[2];
packet[0] = MESSAGE_REQUEST; // Message type, to allow future expansion
packet[1] = padlen;
struct sockaddr_un claddr;
memset(&claddr, 0, sizeof(struct sockaddr_un));
claddr.sun_family = AF_UNIX;
snprintf(claddr.sun_path, sizeof(claddr.sun_path), "/tmp/%s.padenc", m_pad_ident.c_str());
ssize_t ret = ::sendto(m_sock, packet, sizeof(packet), 0, (struct sockaddr*)&claddr, sizeof(struct sockaddr_un));
if (ret == -1) {
// This suppresses the -Wlogical-op warning
if (errno == EAGAIN
#if EAGAIN != EWOULDBLOCK
or errno == EWOULDBLOCK
#endif
or errno == ECONNREFUSED
or errno == ENOENT) {
if (m_padenc_reachable) {
fprintf(stderr, "ODR-PadEnc at %s not reachable\n", claddr.sun_path);
m_padenc_reachable = false;
}
}
else {
fprintf(stderr, "PAD request send failed: %s\n", strerror(errno));
}
}
else if (ret != sizeof(packet)) {
fprintf(stderr, "PAD request incorrect length sent: %zu bytes of %zu transmitted\n",
ret, sizeof(packet));
}
else if (not m_padenc_reachable) {
fprintf(stderr, "ODR-PadEnc is now reachable at %s\n", claddr.sun_path);
m_padenc_reachable = true;
}
vector<uint8_t> buffer(2048);
while (true) {
ret = ::recvfrom(m_sock, buffer.data(), buffer.size(), 0, nullptr, nullptr);
if (ret == -1) {
// This suppresses the -Wlogical-op warning
#if EAGAIN == EWOULDBLOCK
if (errno != EAGAIN)
#else
if (not (errno == EAGAIN or errno == EWOULDBLOCK))
#endif
{
throw runtime_error(string("Can't receive data: ") + strerror(errno));
}
return {};
}
else if (ret > 0) {
buffer.resize(ret);
// We could check where the data comes from, but since we're using UNIX sockets
// the source is anyway local to the machine.
if (buffer[0] == MESSAGE_PAD_DATA) {
vector<uint8_t> pad_data(buffer.size() - 1);
copy(buffer.begin() + 1, buffer.end(), pad_data.begin());
return pad_data;
}
else {
continue;
}
}
}
}
|
