summaryrefslogtreecommitdiffstats
path: root/src/input/Zmq.cpp
blob: d5e722ec1e3b91becc742aa4fda88f5cd90b7369 (plain)
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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
/*
   Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
   Research Center Canada)

   Copyright (C) 2019 Matthias P. Braendli
    http://www.opendigitalradio.org

   ZeroMQ input. see www.zeromq.org for more info

   For the AAC+ input, each zeromq message must contain one superframe
   or one zmq_frame_header_t followed by a superframe.

   For the MPEG input, each zeromq message must contain one frame.

   Encryption is provided by zmq_curve, see the corresponding manpage.

   From the ZeroMQ manpage 'zmq':

       The 0MQ lightweight messaging kernel is a library which extends the standard
       socket interfaces with features traditionally provided by specialised
       messaging middleware products. 0MQ sockets provide an abstraction of
       asynchronous message queues, multiple messaging patterns, message filtering
       (subscriptions), seamless access to multiple transport protocols and more.
   */
/*
   This file is part of ODR-DabMux.

   ODR-DabMux is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as
   published by the Free Software Foundation, either version 3 of the
   License, or (at your option) any later version.

   ODR-DabMux is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with ODR-DabMux.  If not, see <http://www.gnu.org/licenses/>.
   */

#include "input/Zmq.h"

#include <cstdio>
#include <cstdlib>
#include <list>
#include <exception>
#include <cstring>
#include <string>
#include <sstream>
#include <limits.h>
#include "PcDebug.h"
#include "Log.h"
#include "zmq.hpp"

#ifdef __MINGW32__
#   define bzero(s, n) memset(s, 0, n)
#endif

namespace Inputs {

using namespace std;

int readkey(string& keyfile, char* key)
{
    FILE* fd = fopen(keyfile.c_str(), "r");
    if (fd == nullptr) {
        return -1;
    }

    int ret = fread(key, CURVE_KEYLEN, 1, fd);
    fclose(fd);
    if (ret == 0) {
        return -1;
    }

    /* It needs to be zero-terminated */
    key[CURVE_KEYLEN] = '\0';

    return 0;
}

/***** Common functions (MPEG and AAC) ******/

/* If necessary, unbind the socket, then check the keys,
 * if they are ok and encryption is required, set the
 * keys to the socket, and finally bind the socket
 * to the new address
 */
void ZmqBase::rebind()
{
    if (not m_zmq_sock_bound_to.empty()) {
        try {
            m_zmq_sock.unbind(m_zmq_sock_bound_to.c_str());
        }
        catch (const zmq::error_t& err) {
            etiLog.level(warn) << "ZMQ unbind for input " << m_rc_name << " failed";
        }
    }

    m_zmq_sock_bound_to = "";

    /* Load each key independently */
    if (not m_config.curve_public_keyfile.empty()) {
        int rc = readkey(m_config.curve_public_keyfile, m_curve_public_key);

        if (rc < 0) {
            etiLog.level(warn) << "Invalid public key for input " <<
                m_rc_name;

            INVALIDATE_KEY(m_curve_public_key);
        }
    }

    if (not m_config.curve_secret_keyfile.empty()) {
        int rc = readkey(m_config.curve_secret_keyfile, m_curve_secret_key);

        if (rc < 0) {
            etiLog.level(warn) << "Invalid secret key for input " <<
                m_rc_name;

            INVALIDATE_KEY(m_curve_secret_key);
        }
    }

    if (not m_config.curve_encoder_keyfile.empty()) {
        int rc = readkey(m_config.curve_encoder_keyfile, m_curve_encoder_key);

        if (rc < 0) {
            etiLog.level(warn) << "Invalid encoder key for input " <<
                m_rc_name;

            INVALIDATE_KEY(m_curve_encoder_key);
        }
    }

    /* If you want encryption, you need to have defined all
     * key files
     */
    if ( m_config.enable_encryption and
            ( not (KEY_VALID(m_curve_public_key) and
                   KEY_VALID(m_curve_secret_key) and
                   KEY_VALID(m_curve_encoder_key) ) ) ) {
        throw std::runtime_error("When enabling encryption, all three "
                "keyfiles must be valid!");
    }

    if (m_config.enable_encryption) {
        try {
            /* We want to check that the encoder is the right one,
             * so the encoder is the CURVE server.
             */
            m_zmq_sock.setsockopt(ZMQ_CURVE_SERVERKEY,
                    m_curve_encoder_key, CURVE_KEYLEN);
        }
        catch (const zmq::error_t& err) {
            std::ostringstream os;
            os << "ZMQ set encoder key for input " << m_rc_name << " failed" <<
                err.what();
            throw std::runtime_error(os.str());
        }

        try {
            m_zmq_sock.setsockopt(ZMQ_CURVE_PUBLICKEY,
                    m_curve_public_key, CURVE_KEYLEN);
        }
        catch (const zmq::error_t& err) {
            std::ostringstream os;
            os << "ZMQ set public key for input " << m_rc_name << " failed" <<
                err.what();
            throw std::runtime_error(os.str());
        }

        try {
            m_zmq_sock.setsockopt(ZMQ_CURVE_SECRETKEY,
                    m_curve_secret_key, CURVE_KEYLEN);
        }
        catch (const zmq::error_t& err) {
            std::ostringstream os;
            os << "ZMQ set secret key for input " << m_rc_name << " failed" <<
                err.what();
            throw std::runtime_error(os.str());
        }
    }
    else {
        try {
            /* This forces the socket to go to the ZMQ_NULL auth
             * mechanism
             */
            const int no = 0;
            m_zmq_sock.setsockopt(ZMQ_CURVE_SERVER, &no, sizeof(no));
        }
        catch (const zmq::error_t& err) {
            etiLog.level(warn) << "ZMQ disable encryption keys for input " <<
                m_rc_name << " failed: " << err.what();
        }

    }

    // Prepare the ZMQ socket to accept connections
    try {
        m_zmq_sock.bind(m_inputUri.c_str());
    }
    catch (const zmq::error_t& err) {
        std::ostringstream os;
        os << "ZMQ bind for input " << m_rc_name << " failed" <<
            err.what();
        throw std::runtime_error(os.str());
    }

    m_zmq_sock_bound_to = m_inputUri;

    try {
        m_zmq_sock.setsockopt(ZMQ_SUBSCRIBE, nullptr, 0);
    }
    catch (const zmq::error_t& err) {
        std::ostringstream os;
        os << "ZMQ set socket options for input " << m_rc_name << " failed" <<
            err.what();
        throw std::runtime_error(os.str());
    }
}

void ZmqBase::open(const std::string& inputUri)
{
    m_inputUri = inputUri;

    /* Let caller handle exceptions when we open() */
    rebind();

    // We want to appear in the statistics !
    m_stats.registerAtServer();
}

void ZmqBase::close()
{
    m_zmq_sock.close();
}

int ZmqBase::setBitrate(int bitrate)
{
    if (bitrate <= 0) {
        throw invalid_argument("Invalid bitrate " + to_string(bitrate) + " for " + m_name);
    }

    m_bitrate = bitrate;
    return bitrate;
}

// size corresponds to a frame size. It is constant for a given bitrate
size_t ZmqBase::readFrame(uint8_t* buffer, size_t size)
{
    /* We must *always* read data from the ZMQ socket,
     * to make sure that ZMQ internal buffers are emptied
     * quickly. It's the only way to control the buffers
     * of the whole path from encoder to our frame_buffer.
     */
    const auto readsize = readFromSocket(size);

    /* Notify of a buffer overrun, and drop some frames */
    if (m_frame_buffer.size() >= m_config.buffer_size) {
        m_stats.notifyOverrun();

        /* If the buffer is really too full, we drop as many frames as needed
         * to get down to the prebuffering size. We would like to have our buffer
         * filled to the prebuffering length.
         */
        if (m_frame_buffer.size() >= 1.5*m_config.buffer_size) {
            size_t over_max = m_frame_buffer.size() - m_config.prebuffering;

            while (over_max--) {
                m_frame_buffer.pop_front();
            }
        }
        else {
            /* Our frame_buffer contains DAB logical frames. Five of these make one
             * AAC superframe.
             *
             * Dropping this superframe amounts to dropping 120ms of audio.
             *
             * We're actually not sure to drop five DAB logical frames
             * belonging to the same AAC superframe. It is assumed that no
             * receiver will crash because of this. At least, the DAB logical frame
             * vs. AAC superframe alignment is preserved.
             *
             * TODO: of course this assumption probably doesn't hold. Fix this !
             * TODO: also, with MPEG, the above doesn't hold, so we drop five
             *       frames even though we could drop less.
             * */
            for (int frame_del_count = 0; frame_del_count < 5; frame_del_count++) {
                m_frame_buffer.pop_front();
            }
        }
    }

    if (m_prebuf_current > 0) {
        if (readsize > 0)
            m_prebuf_current--;
        if (m_prebuf_current == 0)
            etiLog.log(info, "inputZMQ %s input pre-buffering complete",
                m_rc_name.c_str());

        /* During prebuffering, give a zeroed frame to the mux */
        m_stats.notifyUnderrun();
        memset(buffer, 0, size);
        return size;
    }

    // Save stats data in bytes, not in frames
    m_stats.notifyBuffer(m_frame_buffer.size() * size);

    if (m_frame_buffer.empty()) {
        etiLog.log(warn, "inputZMQ %s input empty, re-enabling pre-buffering",
                m_rc_name.c_str());
        // reset prebuffering
        m_prebuf_current = m_config.prebuffering;

        /* We have no data to give, we give a zeroed frame */
        m_stats.notifyUnderrun();
        memset(buffer, 0, size);
        return size;
    }
    else {
        /* Normal situation, give a frame from the frame_buffer */
        auto& newframe = m_frame_buffer.front();
        if (newframe.size() != size) {
            throw logic_error("Inconsistent ZMQ sizes");
        }
        memcpy(buffer, newframe.data(), newframe.size());
        m_frame_buffer.pop_front();
        return size;
    }
}

size_t ZmqBase::readFrame(uint8_t *buffer, size_t size, std::time_t seconds, int utco, uint32_t tsta)
{
    // TODO add timestamps into the metadata and implement this
    memset(buffer, 0, size);
    return 0;
}


/******** MPEG input *******/

// Read a MPEG frame from the socket, and push to list
int ZmqMPEG::readFromSocket(size_t framesize)
{
    bool messageReceived = false;
    zmq::message_t msg;

    try {
        auto result = m_zmq_sock.recv(msg, zmq::recv_flags::dontwait);
        messageReceived = result.has_value();
        if (not messageReceived) {
            return 0;
        }

    }
    catch (const zmq::error_t& err) {
        etiLog.level(error) << "Failed to receive MPEG frame from zmq socket " <<
                m_rc_name << ": " << err.what();
    }

    /* This is the old 'one superframe per ZMQ message' format */
    uint8_t* data  = (uint8_t*)msg.data();
    size_t datalen = msg.size();

    /* Look for the new zmq_frame_header_t format */
    zmq_frame_header_t* frame = (zmq_frame_header_t*)msg.data();

    if (    msg.size() >= sizeof(zmq_frame_header_t) and
            msg.size() == ZMQ_FRAME_SIZE(frame) and
            frame->version == 1 and
            frame->encoder == ZMQ_ENCODER_MPEG_L2) {
        datalen = frame->datasize;
        data = ZMQ_FRAME_DATA(frame);

        m_stats.notifyPeakLevels(frame->audiolevel_left,
                frame->audiolevel_right);
    }


    if (datalen == framesize) {
        if (m_frame_buffer.size() > m_config.buffer_size) {
            etiLog.level(warn) <<
                "inputZMQ " << m_rc_name <<
                " buffer full (" << m_frame_buffer.size() << "),"
                " dropping incoming frame !";
            messageReceived = false;
        }
        else if (m_enable_input) {
            // copy the input frame blockwise into the frame_buffer
            vector<uint8_t> framedata(framesize);
            copy(data, data + framesize, framedata.begin());
            m_frame_buffer.push_back(move(framedata));
        }
        else {
            return 0;
        }
    }
    else {
        etiLog.level(error) <<
            "inputZMQ " << m_rc_name <<
            " verify bitrate: recv'd " << msg.size() << " B" <<
            ", need " << framesize << ".";
        messageReceived = false;
    }

    return messageReceived ? msg.size() : 0;
}

/******** AAC+ input *******/

// Read a AAC+ superframe from the socket, cut it into five frames,
// and push to list
int ZmqAAC::readFromSocket(size_t framesize)
{
    bool messageReceived = false;
    zmq::message_t msg;

    try {
        auto result = m_zmq_sock.recv(msg, zmq::recv_flags::dontwait);
        messageReceived = result.has_value();
        if (not messageReceived) {
            return 0;
        }

    }
    catch (const zmq::error_t& err) {
        etiLog.level(error) <<
            "Failed to receive AAC superframe from zmq socket " <<
            m_rc_name << ": " << err.what();
    }

    /* This is the old 'one superframe per ZMQ message' format */
    uint8_t* data  = (uint8_t*)msg.data();
    size_t datalen = msg.size();

    /* Look for the new zmq_frame_header_t format */
    zmq_frame_header_t* frame = (zmq_frame_header_t*)msg.data();

    if (    msg.size() >= sizeof(zmq_frame_header_t) and
            msg.size() == ZMQ_FRAME_SIZE(frame) and
            frame->version == 1 and
            frame->encoder == ZMQ_ENCODER_AACPLUS) {
        datalen = frame->datasize;
        data = ZMQ_FRAME_DATA(frame);

        m_stats.notifyPeakLevels(frame->audiolevel_left,
                frame->audiolevel_right);
    }


    /* TS 102 563, Section 6:
     * Audio super frames are transported in five successive DAB logical frames
     * with additional error protection.
     */
    if (datalen) {
        if (datalen == 5*framesize) {
            if (m_frame_buffer.size() > m_config.buffer_size) {
                etiLog.level(warn) <<
                    "inputZMQ " << m_rc_name <<
                    " buffer full (" << m_frame_buffer.size() << "),"
                    " dropping incoming superframe !";
                datalen = 0;
            }
            else if (m_enable_input) {
                // copy the input frame blockwise into the frame_buffer
                for (uint8_t* framestart = data;
                        framestart < &data[5*framesize];
                        framestart += framesize) {
                    vector<uint8_t> audioframe(framesize);
                    copy(framestart, framestart + framesize, audioframe.begin());
                    m_frame_buffer.push_back(move(audioframe));
                }
            }
            else {
                datalen = 0;
            }
        }
        else {
            etiLog.level(error) <<
                "inputZMQ " << m_rc_name <<
                " verify bitrate: recv'd " << msg.size() << " B" <<
                ", need " << 5*framesize << ".";

            datalen = 0;
        }
    }
    else {
        etiLog.level(error) <<
            "inputZMQ " << m_rc_name <<
            " invalid frame received";
    }

    return datalen;
}

/********* REMOTE CONTROL ***********/

void ZmqBase::set_parameter(const string& parameter,
        const string& value)
{
    if (parameter == "buffer") {
        size_t new_limit = atol(value.c_str());

        if (new_limit < INPUT_ZMQ_MIN_BUFFER_SIZE) {
            throw ParameterError("Desired buffer size too small."
                   " Minimum " STRINGIFY(INPUT_ZMQ_MIN_BUFFER_SIZE) );
        }
        else if (new_limit > INPUT_ZMQ_MAX_BUFFER_SIZE) {
            throw ParameterError("Desired buffer size too large."
                   " Maximum " STRINGIFY(INPUT_ZMQ_MAX_BUFFER_SIZE) );
        }

        m_config.buffer_size = new_limit;
    }
    else if (parameter == "prebuffering") {
        size_t new_prebuf = atol(value.c_str());

        if (new_prebuf < INPUT_ZMQ_MIN_BUFFER_SIZE) {
            throw ParameterError("Desired prebuffering too small."
                   " Minimum " STRINGIFY(INPUT_ZMQ_MIN_BUFFER_SIZE) );
        }
        else if (new_prebuf > INPUT_ZMQ_MAX_BUFFER_SIZE) {
            throw ParameterError("Desired prebuffering too large."
                   " Maximum " STRINGIFY(INPUT_ZMQ_MAX_BUFFER_SIZE) );
        }

        m_config.prebuffering = new_prebuf;
    }
    else if (parameter == "enable") {
        if (value == "1") {
            m_enable_input = true;
        }
        else if (value == "0") {
            m_enable_input = false;
        }
        else {
            throw ParameterError("Value not understood, specify 0 or 1.");
        }
    }
    else if (parameter == "encryption") {
        if (value == "1") {
            m_config.enable_encryption = true;
        }
        else if (value == "0") {
            m_config.enable_encryption = false;
        }
        else {
            throw ParameterError("Value not understood, specify 0 or 1.");
        }

        try {
            rebind();
        }
        catch (const std::runtime_error &e) {
            stringstream ss;
            ss << "Could not bind socket again with new keys." <<
                e.what();
            throw ParameterError(ss.str());
        }
    }
    else if (parameter == "secretkey") {
        m_config.curve_secret_keyfile = value;
    }
    else if (parameter == "publickey") {
        m_config.curve_public_keyfile = value;
    }
    else if (parameter == "encoderkey") {
        m_config.curve_encoder_keyfile = value;
    }
    else {
        stringstream ss;
        ss << "Parameter '" << parameter <<
            "' is not exported by controllable " << get_rc_name();
        throw ParameterError(ss.str());
    }
}

const string ZmqBase::get_parameter(const string& parameter) const
{
    stringstream ss;
    if (parameter == "buffer") {
        ss << m_config.buffer_size;
    }
    else if (parameter == "prebuffering") {
        ss << m_config.prebuffering;
    }
    else if (parameter == "enable") {
        if (m_enable_input)
            ss << "true";
        else
            ss << "false";
    }
    else if (parameter == "encryption") {
        if (m_config.enable_encryption)
            ss << "true";
        else
            ss << "false";
    }
    else if (parameter == "secretkey") {
        ss << m_config.curve_secret_keyfile;
    }
    else if (parameter == "publickey") {
        ss << m_config.curve_public_keyfile;
    }
    else if (parameter == "encoderkey") {
        ss << m_config.curve_encoder_keyfile;
    }
    else {
        ss << "Parameter '" << parameter <<
            "' is not exported by controllable " << get_rc_name();
        throw ParameterError(ss.str());
    }
    return ss.str();
}

const json::map_t ZmqBase::get_all_values() const
{
    json::map_t map;
    map["buffer"].v = m_config.buffer_size;
    map["prebuffering"].v = m_config.prebuffering;
    map["enable"].v = m_enable_input;
    map["encryption"].v = m_config.enable_encryption;
    map["secretkey"].v = m_config.curve_secret_keyfile;
    map["publickey"].v = m_config.curve_public_keyfile;
    map["encoderkey"].v = m_config.curve_encoder_keyfile;
    return map;
}

};