summaryrefslogtreecommitdiffstats
path: root/src/modules/module-tunnel.c
blob: aa6b69f5488a97841d9ecd607961000e95e78a88 (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
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
/* $Id$ */

/***
  This file is part of polypaudio.
 
  polypaudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.
 
  polypaudio 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 Lesser General Public License
  along with polypaudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>

#include <polyp/version.h>

#include <polypcore/module.h>
#include <polypcore/util.h>
#include <polypcore/modargs.h>
#include <polypcore/log.h>
#include <polypcore/core-subscribe.h>
#include <polypcore/xmalloc.h>
#include <polypcore/sink-input.h>
#include <polypcore/pdispatch.h>
#include <polypcore/pstream.h>
#include <polypcore/pstream-util.h>
#include <polypcore/authkey.h>
#include <polypcore/socket-client.h>
#include <polypcore/socket-util.h>
#include <polypcore/authkey-prop.h>

#ifdef TUNNEL_SINK
#include "module-tunnel-sink-symdef.h"
PA_MODULE_DESCRIPTION("Tunnel module for sinks")
PA_MODULE_USAGE("server=<address> sink=<remote sink name> cookie=<filename> format=<sample format> channels=<number of channels> rate=<sample rate> sink_name=<name for the local sink>")
#else
#include "module-tunnel-source-symdef.h"
PA_MODULE_DESCRIPTION("Tunnel module for sources")
PA_MODULE_USAGE("server=<address> source=<remote source name> cookie=<filename> format=<sample format> channels=<number of channels> rate=<sample rate> source_name=<name for the local source>")
#endif

PA_MODULE_AUTHOR("Lennart Poettering")
PA_MODULE_VERSION(PACKAGE_VERSION)

#define DEFAULT_SINK_NAME "tunnel"
#define DEFAULT_SOURCE_NAME "tunnel"

#define DEFAULT_TLENGTH (44100*2*2/10)  //(10240*8)
#define DEFAULT_MAXLENGTH ((DEFAULT_TLENGTH*3)/2)
#define DEFAULT_MINREQ 512
#define DEFAULT_PREBUF (DEFAULT_TLENGTH-DEFAULT_MINREQ)
#define DEFAULT_FRAGSIZE 1024

#define DEFAULT_TIMEOUT 5

#define LATENCY_INTERVAL 10

static const char* const valid_modargs[] = {
    "server",
    "cookie",
    "format",
    "channels",
    "rate",
#ifdef TUNNEL_SINK
    "sink_name",
    "sink",
#else
    "source_name",
    "source",
#endif
    NULL,
};

static void command_stream_killed(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
static void command_subscribe_event(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);

#ifdef TUNNEL_SINK
static void command_request(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
#endif

static const pa_pdispatch_cb_t command_table[PA_COMMAND_MAX] = {
#ifdef TUNNEL_SINK
    [PA_COMMAND_REQUEST] = command_request,
#endif    
    [PA_COMMAND_PLAYBACK_STREAM_KILLED] = command_stream_killed,
    [PA_COMMAND_RECORD_STREAM_KILLED] = command_stream_killed,
    [PA_COMMAND_SUBSCRIBE_EVENT] = command_subscribe_event, 
};

struct userdata {
    pa_socket_client *client;
    pa_pstream *pstream;
    pa_pdispatch *pdispatch;

    char *server_name;
#ifdef TUNNEL_SINK
    char *sink_name;
    pa_sink *sink;
    uint32_t requested_bytes;
#else
    char *source_name;
    pa_source *source;
#endif
    
    pa_module *module;
    pa_core *core;

    uint8_t auth_cookie[PA_NATIVE_COOKIE_LENGTH];

    uint32_t version;
    uint32_t ctag;
    uint32_t device_index;
    uint32_t channel;
    
    pa_usec_t host_latency;

    pa_time_event *time_event;

    int auth_cookie_in_property;
};

static void close_stuff(struct userdata *u) {
    assert(u);
    
    if (u->pstream) {
        pa_pstream_close(u->pstream);
        pa_pstream_unref(u->pstream);
        u->pstream = NULL;
    }

    if (u->pdispatch) {
        pa_pdispatch_unref(u->pdispatch);
        u->pdispatch = NULL;
    }

    if (u->client) {
        pa_socket_client_unref(u->client);
        u->client = NULL;
    }

#ifdef TUNNEL_SINK
    if (u->sink) {
        pa_sink_disconnect(u->sink);
        pa_sink_unref(u->sink);
        u->sink = NULL;
    }
#else
    if (u->source) {
        pa_source_disconnect(u->source);
        pa_source_unref(u->source);
        u->source = NULL;
    }
#endif

    if (u->time_event) {
        u->core->mainloop->time_free(u->time_event);
        u->time_event = NULL;
    }
}

static void die(struct userdata *u) {
    assert(u);
    close_stuff(u);
    pa_module_unload_request(u->module);
}

static void command_stream_killed(pa_pdispatch *pd, PA_GCC_UNUSED uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    assert(pd && t && u && u->pdispatch == pd);

    pa_log(__FILE__": stream killed");
    die(u);
}

static void request_info(struct userdata *u);

static void command_subscribe_event(pa_pdispatch *pd, PA_GCC_UNUSED uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    pa_subscription_event_type_t e;
    uint32_t idx;

    assert(pd && t && u);
    assert(command == PA_COMMAND_SUBSCRIBE_EVENT);

    if (pa_tagstruct_getu32(t, &e) < 0 ||
        pa_tagstruct_getu32(t, &idx) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_log(__FILE__": invalid protocol reply");
        die(u);
        return;
    }

#ifdef TUNNEL_SINK
    if (e != (PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE))
        return;
#else
    if (e != (PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE))
        return;
#endif

    request_info(u);
}

#ifdef TUNNEL_SINK
static void send_prebuf_request(struct userdata *u) {
    pa_tagstruct *t;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_PREBUF_PLAYBACK_STREAM);
    pa_tagstruct_putu32(t, u->ctag++);
    pa_tagstruct_putu32(t, u->channel);
    pa_pstream_send_tagstruct(u->pstream, t);
}

static void send_bytes(struct userdata *u) {
    assert(u);

    if (!u->pstream)
        return;

    while (u->requested_bytes > 0) {
        pa_memchunk chunk;
        if (pa_sink_render(u->sink, u->requested_bytes, &chunk) < 0) {

            
            if (u->requested_bytes >= DEFAULT_TLENGTH-DEFAULT_PREBUF) 
                send_prebuf_request(u);
            
            return;
        }

        pa_pstream_send_memblock(u->pstream, u->channel, 0, PA_SEEK_RELATIVE, &chunk);
        pa_memblock_unref(chunk.memblock);

        if (chunk.length > u->requested_bytes)
            u->requested_bytes = 0;
        else
            u->requested_bytes -= chunk.length;
    }
}

static void command_request(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    uint32_t bytes, channel;
    assert(pd && command == PA_COMMAND_REQUEST && t && u && u->pdispatch == pd);

    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        pa_tagstruct_getu32(t, &bytes) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_log(__FILE__": invalid protocol reply");
        die(u);
        return;
    }

    if (channel != u->channel) {
        pa_log(__FILE__": recieved data for invalid channel");
        die(u);
        return;
    }
    
    u->requested_bytes += bytes;
    send_bytes(u);
}

#endif

static void stream_get_latency_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    pa_usec_t buffer_usec, sink_usec, source_usec, transport_usec;
    int playing;
    uint32_t queue_length;
    int64_t write_index, read_index;
    struct timeval local, remote, now;
    assert(pd && u);

    if (command != PA_COMMAND_REPLY) {
        if (command == PA_COMMAND_ERROR)
            pa_log(__FILE__": failed to get latency.");
        else
            pa_log(__FILE__": protocol error.");
        die(u);
        return;
    }
    
    if (pa_tagstruct_get_usec(t, &buffer_usec) < 0 ||
        pa_tagstruct_get_usec(t, &sink_usec) < 0 ||
        pa_tagstruct_get_usec(t, &source_usec) < 0 ||
        pa_tagstruct_get_boolean(t, &playing) < 0 ||
        pa_tagstruct_getu32(t, &queue_length) < 0 ||
        pa_tagstruct_get_timeval(t, &local) < 0 ||
        pa_tagstruct_get_timeval(t, &remote) < 0 ||
        pa_tagstruct_gets64(t, &write_index) < 0 ||
        pa_tagstruct_gets64(t, &read_index) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_log(__FILE__": invalid reply.");
        die(u);
        return;
    }

    pa_gettimeofday(&now);

    if (pa_timeval_cmp(&local, &remote) < 0 && pa_timeval_cmp(&remote, &now)) {
        /* local and remote seem to have synchronized clocks */
#ifdef TUNNEL_SINK
        transport_usec = pa_timeval_diff(&remote, &local);
#else
        transport_usec = pa_timeval_diff(&now, &remote);
#endif    
    } else
        transport_usec = pa_timeval_diff(&now, &local)/2;

#ifdef TUNNEL_SINK
    u->host_latency = sink_usec + transport_usec;
#else
    u->host_latency = source_usec + transport_usec;
    if (u->host_latency > sink_usec)
        u->host_latency -= sink_usec;
    else
        u->host_latency = 0;
#endif

/*     pa_log(__FILE__": estimated host latency: %0.0f usec", (double) u->host_latency); */
}

static void request_latency(struct userdata *u) {
    pa_tagstruct *t;
    struct timeval now;
    uint32_t tag;
    assert(u);

    t = pa_tagstruct_new(NULL, 0);
#ifdef TUNNEL_SINK    
    pa_tagstruct_putu32(t, PA_COMMAND_GET_PLAYBACK_LATENCY);
#else
    pa_tagstruct_putu32(t, PA_COMMAND_GET_RECORD_LATENCY);
#endif
    pa_tagstruct_putu32(t, tag = u->ctag++);
    pa_tagstruct_putu32(t, u->channel);

    pa_gettimeofday(&now);
    pa_tagstruct_put_timeval(t, &now);
    
    pa_pstream_send_tagstruct(u->pstream, t);
    pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, stream_get_latency_callback, u);
}

static void stream_get_info_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    uint32_t index, owner_module, monitor_source;
    pa_usec_t latency;
    const char *name, *description, *monitor_source_name, *driver;
    int mute;
    pa_sample_spec sample_spec;
    pa_channel_map channel_map;
    pa_cvolume volume;
    assert(pd && u);

    if (command != PA_COMMAND_REPLY) {
        if (command == PA_COMMAND_ERROR)
            pa_log(__FILE__": failed to get info.");
        else
            pa_log(__FILE__": protocol error.");
        die(u);
        return;
    }

    if (pa_tagstruct_getu32(t, &index) < 0 ||
        pa_tagstruct_gets(t, &name) < 0 ||
        pa_tagstruct_gets(t, &description) < 0 ||
        pa_tagstruct_get_sample_spec(t, &sample_spec) < 0 ||
        pa_tagstruct_get_channel_map(t, &channel_map) < 0 ||
        pa_tagstruct_getu32(t, &owner_module) < 0 ||
        pa_tagstruct_get_cvolume(t, &volume) < 0 ||
        pa_tagstruct_get_boolean(t, &mute) < 0 ||
        pa_tagstruct_getu32(t, &monitor_source) < 0 ||
        pa_tagstruct_gets(t, &monitor_source_name) < 0 ||
        pa_tagstruct_get_usec(t, &latency) < 0 ||
        pa_tagstruct_gets(t, &driver) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_log(__FILE__": invalid reply.");
        die(u);
        return;
    }

#ifdef TUNNEL_SINK
    assert(u->sink);
    if ((!!mute == !!u->sink->hw_muted) &&
        pa_cvolume_equal(&volume, &u->sink->hw_volume))
        return;
#else
    assert(u->source);
    if ((!!mute == !!u->source->hw_muted) &&
        pa_cvolume_equal(&volume, &u->source->hw_volume))
        return;
#endif

#ifdef TUNNEL_SINK
    memcpy(&u->sink->hw_volume, &volume, sizeof(pa_cvolume));
    u->sink->hw_muted = !!mute;

    pa_subscription_post(u->sink->core,
        PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE,
        u->sink->index);
#else
    memcpy(&u->source->hw_volume, &volume, sizeof(pa_cvolume));
    u->source->hw_muted = !!mute;

    pa_subscription_post(u->source->core,
        PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE,
        u->source->index);
#endif
}

static void request_info(struct userdata *u) {
    pa_tagstruct *t;
    uint32_t tag;
    assert(u);

    t = pa_tagstruct_new(NULL, 0);
#ifdef TUNNEL_SINK
    pa_tagstruct_putu32(t, PA_COMMAND_GET_SINK_INFO);
#else
    pa_tagstruct_putu32(t, PA_COMMAND_GET_SOURCE_INFO);
#endif
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
#ifdef TUNNEL_SINK
    pa_tagstruct_puts(t, u->sink_name);
#else
    pa_tagstruct_puts(t, u->source_name);
#endif

    pa_pstream_send_tagstruct(u->pstream, t);
    pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, stream_get_info_callback, u);
}

static void start_subscribe(struct userdata *u) {
    pa_tagstruct *t;
    uint32_t tag;
    assert(u);

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SUBSCRIBE);
    pa_tagstruct_putu32(t, tag = u->ctag++);

#ifdef TUNNEL_SINK
    pa_tagstruct_putu32(t, PA_SUBSCRIPTION_MASK_SINK);
#else
    pa_tagstruct_putu32(t, PA_SUBSCRIPTION_MASK_SOURCE);
#endif

    pa_pstream_send_tagstruct(u->pstream, t);
}

static void create_stream_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    assert(pd && u && u->pdispatch == pd);

    if (command != PA_COMMAND_REPLY) {
        if (command == PA_COMMAND_ERROR)
            pa_log(__FILE__": failed to create stream.");
        else
            pa_log(__FILE__": protocol error.");
        die(u);
        return;
    }

    if (pa_tagstruct_getu32(t, &u->channel) < 0 ||
        pa_tagstruct_getu32(t, &u->device_index) < 0 ||
#ifdef TUNNEL_SINK        
        pa_tagstruct_getu32(t, &u->requested_bytes) < 0 ||
#endif        
        !pa_tagstruct_eof(t)) {
        pa_log(__FILE__": invalid reply.");
        die(u);
        return;
    }

    start_subscribe(u);
    request_info(u);

    request_latency(u);
#ifdef TUNNEL_SINK
    send_bytes(u);
#endif
}

static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    pa_tagstruct *reply;
    char name[256], un[128], hn[128];
#ifdef TUNNEL_SINK
    pa_cvolume volume;
#endif
    assert(pd && u && u->pdispatch == pd);

    if (command != PA_COMMAND_REPLY ||
        pa_tagstruct_getu32(t, &u->version) < 0 ||
        !pa_tagstruct_eof(t)) {
        if (command == PA_COMMAND_ERROR)
            pa_log(__FILE__": failed to authenticate");
        else
            pa_log(__FILE__": protocol error.");
        die(u);
        return;
    }

    /* Minimum supported protocol version */
    if (u->version < 8) {
        pa_log(__FILE__": incompatible protocol version");
        die(u);
        return;
    }

#ifdef TUNNEL_SINK
    snprintf(name, sizeof(name), "Tunnel from host '%s', user '%s', sink '%s'",
             pa_get_host_name(hn, sizeof(hn)),
             pa_get_user_name(un, sizeof(un)),
             u->sink->name);
#else
    snprintf(name, sizeof(name), "Tunnel from host '%s', user '%s', source '%s'",
             pa_get_host_name(hn, sizeof(hn)),
             pa_get_user_name(un, sizeof(un)),
             u->source->name);
#endif
    
    reply = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(reply, PA_COMMAND_SET_CLIENT_NAME);
    pa_tagstruct_putu32(reply, tag = u->ctag++);
    pa_tagstruct_puts(reply, name);
    pa_pstream_send_tagstruct(u->pstream, reply);
    /* We ignore the server's reply here */

    reply = pa_tagstruct_new(NULL, 0);
#ifdef TUNNEL_SINK    
    pa_tagstruct_putu32(reply, PA_COMMAND_CREATE_PLAYBACK_STREAM);
    pa_tagstruct_putu32(reply, tag = u->ctag++);
    pa_tagstruct_puts(reply, name);
    pa_tagstruct_put_sample_spec(reply, &u->sink->sample_spec);
    pa_tagstruct_put_channel_map(reply, &u->sink->channel_map);
    pa_tagstruct_putu32(reply, PA_INVALID_INDEX);
    pa_tagstruct_puts(reply, u->sink_name);
    pa_tagstruct_putu32(reply, DEFAULT_MAXLENGTH);
    pa_tagstruct_put_boolean(reply, 0);
    pa_tagstruct_putu32(reply, DEFAULT_TLENGTH);
    pa_tagstruct_putu32(reply, DEFAULT_PREBUF);
    pa_tagstruct_putu32(reply, DEFAULT_MINREQ);
    pa_tagstruct_putu32(reply, 0);
    pa_cvolume_reset(&volume, u->sink->sample_spec.channels);
    pa_tagstruct_put_cvolume(reply, &volume);
#else
    pa_tagstruct_putu32(reply, PA_COMMAND_CREATE_RECORD_STREAM);
    pa_tagstruct_putu32(reply, tag = u->ctag++);
    pa_tagstruct_puts(reply, name);
    pa_tagstruct_put_sample_spec(reply, &u->source->sample_spec);
    pa_tagstruct_put_channel_map(reply, &u->source->channel_map);
    pa_tagstruct_putu32(reply, PA_INVALID_INDEX);
    pa_tagstruct_puts(reply, u->source_name);
    pa_tagstruct_putu32(reply, DEFAULT_MAXLENGTH);
    pa_tagstruct_put_boolean(reply, 0);
    pa_tagstruct_putu32(reply, DEFAULT_FRAGSIZE);
#endif
    
    pa_pstream_send_tagstruct(u->pstream, reply);
    pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, create_stream_callback, u);
}

static void pstream_die_callback(pa_pstream *p, void *userdata) {
    struct userdata *u = userdata;
    assert(p && u);

    pa_log(__FILE__": stream died.");
    die(u);
}


static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const void*creds, void *userdata) {
    struct userdata *u = userdata;
    assert(p && packet && u);

    if (pa_pdispatch_run(u->pdispatch, packet, creds, u) < 0) {
        pa_log(__FILE__": invalid packet");
        die(u);
    }
}

#ifndef TUNNEL_SINK
static void pstream_memblock_callback(pa_pstream *p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata) {
    struct userdata *u = userdata;
    assert(p && chunk && u);

    if (channel != u->channel) {
        pa_log(__FILE__": recieved memory block on bad channel.");
        die(u);
        return;
    }
    
    pa_source_post(u->source, chunk);
}
#endif

static void on_connection(pa_socket_client *sc, pa_iochannel *io, void *userdata) {
    struct userdata *u = userdata;
    pa_tagstruct *t;
    uint32_t tag;
    assert(sc && u && u->client == sc);

    pa_socket_client_unref(u->client);
    u->client = NULL;
    
    if (!io) {
        pa_log(__FILE__": connection failed.");
        pa_module_unload_request(u->module);
        return;
    }

    u->pstream = pa_pstream_new(u->core->mainloop, io, u->core->memblock_stat);
    u->pdispatch = pa_pdispatch_new(u->core->mainloop, command_table, PA_COMMAND_MAX);

    pa_pstream_set_die_callback(u->pstream, pstream_die_callback, u);
    pa_pstream_set_recieve_packet_callback(u->pstream, pstream_packet_callback, u);
#ifndef TUNNEL_SINK
    pa_pstream_set_recieve_memblock_callback(u->pstream, pstream_memblock_callback, u);
#endif
    
    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_AUTH);
    pa_tagstruct_putu32(t, tag = u->ctag++);
    pa_tagstruct_putu32(t, PA_PROTOCOL_VERSION);
    pa_tagstruct_put_arbitrary(t, u->auth_cookie, sizeof(u->auth_cookie));
    pa_pstream_send_tagstruct(u->pstream, t);
    pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, u);
    
}

#ifdef TUNNEL_SINK
static void sink_notify(pa_sink*sink) {
    struct userdata *u;
    assert(sink && sink->userdata);
    u = sink->userdata;

    send_bytes(u);
}

static pa_usec_t sink_get_latency(pa_sink *sink) {
    struct userdata *u;
    uint32_t l;
    pa_usec_t usec = 0;
    assert(sink && sink->userdata);
    u = sink->userdata;

    l = DEFAULT_TLENGTH;

    if (l > u->requested_bytes) {
        l -= u->requested_bytes;
        usec += pa_bytes_to_usec(l, &u->sink->sample_spec);
    }

    usec += u->host_latency;

    return usec;
}

static int sink_get_hw_volume(pa_sink *sink) {
    struct userdata *u;
    assert(sink && sink->userdata);
    u = sink->userdata;

    return 0;
}

static int sink_set_hw_volume(pa_sink *sink) {
    struct userdata *u;
    pa_tagstruct *t;
    uint32_t tag;
    assert(sink && sink->userdata);
    u = sink->userdata;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SET_SINK_VOLUME);
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, u->sink_name);
    pa_tagstruct_put_cvolume(t, &sink->hw_volume);
    pa_pstream_send_tagstruct(u->pstream, t);

    return 0;
}

static int sink_get_hw_mute(pa_sink *sink) {
    struct userdata *u;
    assert(sink && sink->userdata);
    u = sink->userdata;

    return 0;
}

static int sink_set_hw_mute(pa_sink *sink) {
    struct userdata *u;
    pa_tagstruct *t;
    uint32_t tag;
    assert(sink && sink->userdata);
    u = sink->userdata;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SET_SINK_MUTE);
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, u->sink_name);
    pa_tagstruct_put_boolean(t, !!sink->hw_muted);
    pa_pstream_send_tagstruct(u->pstream, t);

    return 0;
}
#else
static pa_usec_t source_get_latency(pa_source *source) {
    struct userdata *u;
    assert(source && source->userdata);
    u = source->userdata;

    return u->host_latency;
}

static int source_get_hw_volume(pa_source *source) {
    struct userdata *u;
    assert(source && source->userdata);
    u = source->userdata;

    return 0;
}

static int source_set_hw_volume(pa_source *source) {
    struct userdata *u;
    pa_tagstruct *t;
    uint32_t tag;
    assert(source && source->userdata);
    u = source->userdata;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SET_SOURCE_VOLUME);
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, u->source_name);
    pa_tagstruct_put_cvolume(t, &source->hw_volume);
    pa_pstream_send_tagstruct(u->pstream, t);

    return 0;
}

static int source_get_hw_mute(pa_source *source) {
    struct userdata *u;
    assert(source && source->userdata);
    u = source->userdata;

    return 0;
}

static int source_set_hw_mute(pa_source *source) {
    struct userdata *u;
    pa_tagstruct *t;
    uint32_t tag;
    assert(source && source->userdata);
    u = source->userdata;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SET_SOURCE_MUTE);
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, u->source_name);
    pa_tagstruct_put_boolean(t, !!source->hw_muted);
    pa_pstream_send_tagstruct(u->pstream, t);

    return 0;
}
#endif

static void timeout_callback(pa_mainloop_api *m, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
    struct userdata *u = userdata;
    struct timeval ntv;
    assert(m && e && u);

    request_latency(u);
    
    pa_gettimeofday(&ntv);
    ntv.tv_sec += LATENCY_INTERVAL;
    m->time_restart(e, &ntv);
}

static int load_key(struct userdata *u, const char*fn) {
    assert(u);

    u->auth_cookie_in_property = 0;
    
    if (!fn && pa_authkey_prop_get(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME, u->auth_cookie, sizeof(u->auth_cookie)) >= 0) {
        pa_log_debug(__FILE__": using already loaded auth cookie.");
        pa_authkey_prop_ref(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME);
        u->auth_cookie_in_property = 1;
        return 0;
    }
    
    if (!fn)
        fn = PA_NATIVE_COOKIE_FILE;

    if (pa_authkey_load_auto(fn, u->auth_cookie, sizeof(u->auth_cookie)) < 0)
        return -1;

    pa_log_debug(__FILE__": loading cookie from disk.");
    
    if (pa_authkey_prop_put(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME, u->auth_cookie, sizeof(u->auth_cookie)) >= 0)
        u->auth_cookie_in_property = 1;

    return 0;
}

int pa__init(pa_core *c, pa_module*m) {
    pa_modargs *ma = NULL;
    struct userdata *u = NULL;
    pa_sample_spec ss;
    struct timeval ntv;
    assert(c && m);

    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log(__FILE__": failed to parse module arguments");
        goto fail;
    }

    u = pa_xmalloc(sizeof(struct userdata));
    m->userdata = u;
    u->module = m;
    u->core = c;
    u->client = NULL;
    u->pdispatch = NULL;
    u->pstream = NULL;
    u->server_name = NULL;
#ifdef TUNNEL_SINK
    u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));;
    u->sink = NULL;
    u->requested_bytes = 0;
#else
    u->source_name = pa_xstrdup(pa_modargs_get_value(ma, "source", NULL));;
    u->source = NULL;
#endif
    u->ctag = 1;
    u->device_index = u->channel = PA_INVALID_INDEX;
    u->host_latency = 0;
    u->auth_cookie_in_property = 0;
    u->time_event = NULL;
    
    if (load_key(u, pa_modargs_get_value(ma, "cookie", NULL)) < 0)
        goto fail;
    
    if (!(u->server_name = pa_xstrdup(pa_modargs_get_value(ma, "server", NULL)))) {
        pa_log(__FILE__": no server specified.");
        goto fail;
    }

    ss = c->default_sample_spec;
    if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
        pa_log(__FILE__": invalid sample format specification");
        goto fail;
    }

    if (!(u->client = pa_socket_client_new_string(c->mainloop, u->server_name, PA_NATIVE_DEFAULT_PORT))) {
        pa_log(__FILE__": failed to connect to server '%s'", u->server_name);
        goto fail;
    }
    
    if (!u->client)
        goto fail;

    pa_socket_client_set_callback(u->client, on_connection, u);

#ifdef TUNNEL_SINK
    if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, NULL))) {
        pa_log(__FILE__": failed to create sink.");
        goto fail;
    }

    u->sink->notify = sink_notify;
    u->sink->get_latency = sink_get_latency;
    u->sink->get_hw_volume = sink_get_hw_volume;
    u->sink->set_hw_volume = sink_set_hw_volume;
    u->sink->get_hw_mute = sink_get_hw_mute;
    u->sink->set_hw_mute = sink_set_hw_mute;
    u->sink->userdata = u;
    u->sink->description = pa_sprintf_malloc("Tunnel to '%s%s%s'", u->sink_name ? u->sink_name : "", u->sink_name ? "@" : "", u->server_name);

    pa_sink_set_owner(u->sink, m);
#else
    if (!(u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, NULL))) {
        pa_log(__FILE__": failed to create source.");
        goto fail;
    }

    u->source->get_latency = source_get_latency;
    u->source->get_hw_volume = source_get_hw_volume;
    u->source->set_hw_volume = source_set_hw_volume;
    u->source->get_hw_mute = source_get_hw_mute;
    u->source->set_hw_mute = source_set_hw_mute;
    u->source->userdata = u;
    u->source->description = pa_sprintf_malloc("Tunnel to '%s%s%s'", u->source_name ? u->source_name : "", u->source_name ? "@" : "", u->server_name);

    pa_source_set_owner(u->source, m);
#endif
    
    pa_gettimeofday(&ntv);
    ntv.tv_sec += LATENCY_INTERVAL;
    u->time_event = c->mainloop->time_new(c->mainloop, &ntv, timeout_callback, u);

    pa_modargs_free(ma);

    return 0;
    
fail:
    pa__done(c, m);

    if (ma)
        pa_modargs_free(ma);
    return  -1;
}

void pa__done(pa_core *c, pa_module*m) {
    struct userdata* u;
    assert(c && m);

    if (!(u = m->userdata))
        return;

    close_stuff(u);

    if (u->auth_cookie_in_property)
        pa_authkey_prop_unref(c, PA_NATIVE_COOKIE_PROPERTY_NAME);
    
#ifdef TUNNEL_SINK
    pa_xfree(u->sink_name);
#else
    pa_xfree(u->source_name);
#endif
    pa_xfree(u->server_name);

    pa_xfree(u);
}