aboutsummaryrefslogtreecommitdiffstats
path: root/Alc/backends/alsa.c
blob: f7ff6efde279dbfc737ecdbcd805ba4d5b367d80 (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
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
/**
 * OpenAL cross platform audio library
 * Copyright (C) 1999-2007 by authors.
 * This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 *  Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the
 *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *  Boston, MA  02111-1307, USA.
 * Or go to http://www.gnu.org/copyleft/lgpl.html
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <memory.h>

#include "alMain.h"

#include <alsa/asoundlib.h>


static const ALCchar alsaDevice[] = "ALSA Default";


static void *alsa_handle;
#ifdef HAVE_DYNLOAD
#define MAKE_FUNC(f) static typeof(f) * p##f
MAKE_FUNC(snd_strerror);
MAKE_FUNC(snd_pcm_open);
MAKE_FUNC(snd_pcm_close);
MAKE_FUNC(snd_pcm_nonblock);
MAKE_FUNC(snd_pcm_frames_to_bytes);
MAKE_FUNC(snd_pcm_bytes_to_frames);
MAKE_FUNC(snd_pcm_hw_params_malloc);
MAKE_FUNC(snd_pcm_hw_params_free);
MAKE_FUNC(snd_pcm_hw_params_any);
MAKE_FUNC(snd_pcm_hw_params_set_access);
MAKE_FUNC(snd_pcm_hw_params_set_format);
MAKE_FUNC(snd_pcm_hw_params_set_channels);
MAKE_FUNC(snd_pcm_hw_params_set_periods_near);
MAKE_FUNC(snd_pcm_hw_params_set_rate_near);
MAKE_FUNC(snd_pcm_hw_params_set_rate);
MAKE_FUNC(snd_pcm_hw_params_set_rate_resample);
MAKE_FUNC(snd_pcm_hw_params_set_buffer_time_near);
MAKE_FUNC(snd_pcm_hw_params_set_period_time_near);
MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_near);
MAKE_FUNC(snd_pcm_hw_params_set_period_size_near);
MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_min);
MAKE_FUNC(snd_pcm_hw_params_get_buffer_size);
MAKE_FUNC(snd_pcm_hw_params_get_period_size);
MAKE_FUNC(snd_pcm_hw_params_get_access);
MAKE_FUNC(snd_pcm_hw_params_get_periods);
MAKE_FUNC(snd_pcm_hw_params_test_format);
MAKE_FUNC(snd_pcm_hw_params_test_channels);
MAKE_FUNC(snd_pcm_hw_params);
MAKE_FUNC(snd_pcm_sw_params_malloc);
MAKE_FUNC(snd_pcm_sw_params_current);
MAKE_FUNC(snd_pcm_sw_params_set_avail_min);
MAKE_FUNC(snd_pcm_sw_params_set_stop_threshold);
MAKE_FUNC(snd_pcm_sw_params);
MAKE_FUNC(snd_pcm_sw_params_free);
MAKE_FUNC(snd_pcm_prepare);
MAKE_FUNC(snd_pcm_start);
MAKE_FUNC(snd_pcm_resume);
MAKE_FUNC(snd_pcm_reset);
MAKE_FUNC(snd_pcm_wait);
MAKE_FUNC(snd_pcm_state);
MAKE_FUNC(snd_pcm_avail_update);
MAKE_FUNC(snd_pcm_areas_silence);
MAKE_FUNC(snd_pcm_mmap_begin);
MAKE_FUNC(snd_pcm_mmap_commit);
MAKE_FUNC(snd_pcm_readi);
MAKE_FUNC(snd_pcm_writei);
MAKE_FUNC(snd_pcm_drain);
MAKE_FUNC(snd_pcm_recover);
MAKE_FUNC(snd_pcm_info_malloc);
MAKE_FUNC(snd_pcm_info_free);
MAKE_FUNC(snd_pcm_info_set_device);
MAKE_FUNC(snd_pcm_info_set_subdevice);
MAKE_FUNC(snd_pcm_info_set_stream);
MAKE_FUNC(snd_pcm_info_get_name);
MAKE_FUNC(snd_ctl_pcm_next_device);
MAKE_FUNC(snd_ctl_pcm_info);
MAKE_FUNC(snd_ctl_open);
MAKE_FUNC(snd_ctl_close);
MAKE_FUNC(snd_ctl_card_info_malloc);
MAKE_FUNC(snd_ctl_card_info_free);
MAKE_FUNC(snd_ctl_card_info);
MAKE_FUNC(snd_ctl_card_info_get_name);
MAKE_FUNC(snd_ctl_card_info_get_id);
MAKE_FUNC(snd_card_next);
#undef MAKE_FUNC

#define snd_strerror psnd_strerror
#define snd_pcm_open psnd_pcm_open
#define snd_pcm_close psnd_pcm_close
#define snd_pcm_nonblock psnd_pcm_nonblock
#define snd_pcm_frames_to_bytes psnd_pcm_frames_to_bytes
#define snd_pcm_bytes_to_frames psnd_pcm_bytes_to_frames
#define snd_pcm_hw_params_malloc psnd_pcm_hw_params_malloc
#define snd_pcm_hw_params_free psnd_pcm_hw_params_free
#define snd_pcm_hw_params_any psnd_pcm_hw_params_any
#define snd_pcm_hw_params_set_access psnd_pcm_hw_params_set_access
#define snd_pcm_hw_params_set_format psnd_pcm_hw_params_set_format
#define snd_pcm_hw_params_set_channels psnd_pcm_hw_params_set_channels
#define snd_pcm_hw_params_set_periods_near psnd_pcm_hw_params_set_periods_near
#define snd_pcm_hw_params_set_rate_near psnd_pcm_hw_params_set_rate_near
#define snd_pcm_hw_params_set_rate psnd_pcm_hw_params_set_rate
#define snd_pcm_hw_params_set_rate_resample psnd_pcm_hw_params_set_rate_resample
#define snd_pcm_hw_params_set_buffer_time_near psnd_pcm_hw_params_set_buffer_time_near
#define snd_pcm_hw_params_set_period_time_near psnd_pcm_hw_params_set_period_time_near
#define snd_pcm_hw_params_set_buffer_size_near psnd_pcm_hw_params_set_buffer_size_near
#define snd_pcm_hw_params_set_period_size_near psnd_pcm_hw_params_set_period_size_near
#define snd_pcm_hw_params_set_buffer_size_min psnd_pcm_hw_params_set_buffer_size_min
#define snd_pcm_hw_params_get_buffer_size psnd_pcm_hw_params_get_buffer_size
#define snd_pcm_hw_params_get_period_size psnd_pcm_hw_params_get_period_size
#define snd_pcm_hw_params_get_access psnd_pcm_hw_params_get_access
#define snd_pcm_hw_params_get_periods psnd_pcm_hw_params_get_periods
#define snd_pcm_hw_params_test_format psnd_pcm_hw_params_test_format
#define snd_pcm_hw_params_test_channels psnd_pcm_hw_params_test_channels
#define snd_pcm_hw_params psnd_pcm_hw_params
#define snd_pcm_sw_params_malloc psnd_pcm_sw_params_malloc
#define snd_pcm_sw_params_current psnd_pcm_sw_params_current
#define snd_pcm_sw_params_set_avail_min psnd_pcm_sw_params_set_avail_min
#define snd_pcm_sw_params_set_stop_threshold psnd_pcm_sw_params_set_stop_threshold
#define snd_pcm_sw_params psnd_pcm_sw_params
#define snd_pcm_sw_params_free psnd_pcm_sw_params_free
#define snd_pcm_prepare psnd_pcm_prepare
#define snd_pcm_start psnd_pcm_start
#define snd_pcm_resume psnd_pcm_resume
#define snd_pcm_reset psnd_pcm_reset
#define snd_pcm_wait psnd_pcm_wait
#define snd_pcm_state psnd_pcm_state
#define snd_pcm_avail_update psnd_pcm_avail_update
#define snd_pcm_areas_silence psnd_pcm_areas_silence
#define snd_pcm_mmap_begin psnd_pcm_mmap_begin
#define snd_pcm_mmap_commit psnd_pcm_mmap_commit
#define snd_pcm_readi psnd_pcm_readi
#define snd_pcm_writei psnd_pcm_writei
#define snd_pcm_drain psnd_pcm_drain
#define snd_pcm_recover psnd_pcm_recover
#define snd_pcm_info_malloc psnd_pcm_info_malloc
#define snd_pcm_info_free psnd_pcm_info_free
#define snd_pcm_info_set_device psnd_pcm_info_set_device
#define snd_pcm_info_set_subdevice psnd_pcm_info_set_subdevice
#define snd_pcm_info_set_stream psnd_pcm_info_set_stream
#define snd_pcm_info_get_name psnd_pcm_info_get_name
#define snd_ctl_pcm_next_device psnd_ctl_pcm_next_device
#define snd_ctl_pcm_info psnd_ctl_pcm_info
#define snd_ctl_open psnd_ctl_open
#define snd_ctl_close psnd_ctl_close
#define snd_ctl_card_info_malloc psnd_ctl_card_info_malloc
#define snd_ctl_card_info_free psnd_ctl_card_info_free
#define snd_ctl_card_info psnd_ctl_card_info
#define snd_ctl_card_info_get_name psnd_ctl_card_info_get_name
#define snd_ctl_card_info_get_id psnd_ctl_card_info_get_id
#define snd_card_next psnd_card_next
#endif


static ALCboolean alsa_load(void)
{
    if(!alsa_handle)
    {
#ifdef HAVE_DYNLOAD
        alsa_handle = LoadLib("libasound.so.2");
        if(!alsa_handle)
            return ALC_FALSE;

#define LOAD_FUNC(f) do {                                                     \
    p##f = GetSymbol(alsa_handle, #f);                                        \
    if(p##f == NULL) {                                                        \
        CloseLib(alsa_handle);                                                \
        alsa_handle = NULL;                                                   \
        return ALC_FALSE;                                                     \
    }                                                                         \
} while(0)
        LOAD_FUNC(snd_strerror);
        LOAD_FUNC(snd_pcm_open);
        LOAD_FUNC(snd_pcm_close);
        LOAD_FUNC(snd_pcm_nonblock);
        LOAD_FUNC(snd_pcm_frames_to_bytes);
        LOAD_FUNC(snd_pcm_bytes_to_frames);
        LOAD_FUNC(snd_pcm_hw_params_malloc);
        LOAD_FUNC(snd_pcm_hw_params_free);
        LOAD_FUNC(snd_pcm_hw_params_any);
        LOAD_FUNC(snd_pcm_hw_params_set_access);
        LOAD_FUNC(snd_pcm_hw_params_set_format);
        LOAD_FUNC(snd_pcm_hw_params_set_channels);
        LOAD_FUNC(snd_pcm_hw_params_set_periods_near);
        LOAD_FUNC(snd_pcm_hw_params_set_rate_near);
        LOAD_FUNC(snd_pcm_hw_params_set_rate);
        LOAD_FUNC(snd_pcm_hw_params_set_rate_resample);
        LOAD_FUNC(snd_pcm_hw_params_set_buffer_time_near);
        LOAD_FUNC(snd_pcm_hw_params_set_period_time_near);
        LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_near);
        LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_min);
        LOAD_FUNC(snd_pcm_hw_params_set_period_size_near);
        LOAD_FUNC(snd_pcm_hw_params_get_buffer_size);
        LOAD_FUNC(snd_pcm_hw_params_get_period_size);
        LOAD_FUNC(snd_pcm_hw_params_get_access);
        LOAD_FUNC(snd_pcm_hw_params_get_periods);
        LOAD_FUNC(snd_pcm_hw_params_test_format);
        LOAD_FUNC(snd_pcm_hw_params_test_channels);
        LOAD_FUNC(snd_pcm_hw_params);
        LOAD_FUNC(snd_pcm_sw_params_malloc);
        LOAD_FUNC(snd_pcm_sw_params_current);
        LOAD_FUNC(snd_pcm_sw_params_set_avail_min);
        LOAD_FUNC(snd_pcm_sw_params_set_stop_threshold);
        LOAD_FUNC(snd_pcm_sw_params);
        LOAD_FUNC(snd_pcm_sw_params_free);
        LOAD_FUNC(snd_pcm_prepare);
        LOAD_FUNC(snd_pcm_start);
        LOAD_FUNC(snd_pcm_resume);
        LOAD_FUNC(snd_pcm_reset);
        LOAD_FUNC(snd_pcm_wait);
        LOAD_FUNC(snd_pcm_state);
        LOAD_FUNC(snd_pcm_avail_update);
        LOAD_FUNC(snd_pcm_areas_silence);
        LOAD_FUNC(snd_pcm_mmap_begin);
        LOAD_FUNC(snd_pcm_mmap_commit);
        LOAD_FUNC(snd_pcm_readi);
        LOAD_FUNC(snd_pcm_writei);
        LOAD_FUNC(snd_pcm_drain);
        LOAD_FUNC(snd_pcm_recover);
        LOAD_FUNC(snd_pcm_info_malloc);
        LOAD_FUNC(snd_pcm_info_free);
        LOAD_FUNC(snd_pcm_info_set_device);
        LOAD_FUNC(snd_pcm_info_set_subdevice);
        LOAD_FUNC(snd_pcm_info_set_stream);
        LOAD_FUNC(snd_pcm_info_get_name);
        LOAD_FUNC(snd_ctl_pcm_next_device);
        LOAD_FUNC(snd_ctl_pcm_info);
        LOAD_FUNC(snd_ctl_open);
        LOAD_FUNC(snd_ctl_close);
        LOAD_FUNC(snd_ctl_card_info_malloc);
        LOAD_FUNC(snd_ctl_card_info_free);
        LOAD_FUNC(snd_ctl_card_info);
        LOAD_FUNC(snd_ctl_card_info_get_name);
        LOAD_FUNC(snd_ctl_card_info_get_id);
        LOAD_FUNC(snd_card_next);
#undef LOAD_FUNC
#else
        alsa_handle = (void*)0xDEADBEEF;
#endif
    }
    return ALC_TRUE;
}


typedef struct {
    snd_pcm_t *pcmHandle;

    ALvoid *buffer;
    ALsizei size;

    ALboolean doCapture;
    RingBuffer *ring;

    volatile int killNow;
    ALvoid *thread;
} alsa_data;

typedef struct {
    ALCchar *name;
    char *device;
} DevMap;

static DevMap *allDevNameMap;
static ALuint numDevNames;
static DevMap *allCaptureDevNameMap;
static ALuint numCaptureDevNames;


static const char *prefix_name(snd_pcm_stream_t stream)
{
    assert(stream == SND_PCM_STREAM_PLAYBACK || stream == SND_PCM_STREAM_CAPTURE);
    return (stream==SND_PCM_STREAM_PLAYBACK) ? "device-prefix" : "capture-prefix";
}

static DevMap *probe_devices(snd_pcm_stream_t stream, ALuint *count)
{
    const char *main_prefix = "plughw:";
    snd_ctl_t *handle;
    int card, err, dev, idx;
    snd_ctl_card_info_t *info;
    snd_pcm_info_t *pcminfo;
    DevMap *DevList;

    ConfigValueStr("alsa", prefix_name(stream), &main_prefix);

    snd_ctl_card_info_malloc(&info);
    snd_pcm_info_malloc(&pcminfo);

    DevList = malloc(sizeof(DevMap) * 1);
    DevList[0].name = strdup("ALSA Default");
    DevList[0].device = NULL;
    idx = 1;

    card = -1;
    if((err=snd_card_next(&card)) < 0)
        ERR("Failed to find a card: %s\n", snd_strerror(err));
    while(card >= 0)
    {
        const char *card_prefix = main_prefix;
        const char *cardname, *cardid;
        char name[256];

        snprintf(name, sizeof(name), "hw:%d", card);
        if((err = snd_ctl_open(&handle, name, 0)) < 0)
        {
            ERR("control open (hw:%d): %s\n", card, snd_strerror(err));
            goto next_card;
        }
        if((err = snd_ctl_card_info(handle, info)) < 0)
        {
            ERR("control hardware info (hw:%d): %s\n", card, snd_strerror(err));
            snd_ctl_close(handle);
            goto next_card;
        }

        cardname = snd_ctl_card_info_get_name(info);
        cardid = snd_ctl_card_info_get_id(info);

        snprintf(name, sizeof(name), "%s-%s", prefix_name(stream), cardid);
        ConfigValueStr("alsa", name, &card_prefix);

        dev = -1;
        while(1)
        {
            const char *devname;
            void *temp;

            if(snd_ctl_pcm_next_device(handle, &dev) < 0)
                ERR("snd_ctl_pcm_next_device failed\n");
            if(dev < 0)
                break;

            snd_pcm_info_set_device(pcminfo, dev);
            snd_pcm_info_set_subdevice(pcminfo, 0);
            snd_pcm_info_set_stream(pcminfo, stream);
            if((err = snd_ctl_pcm_info(handle, pcminfo)) < 0) {
                if(err != -ENOENT)
                    ERR("control digital audio info (hw:%d): %s\n", card, snd_strerror(err));
                continue;
            }

            temp = realloc(DevList, sizeof(DevMap) * (idx+1));
            if(temp)
            {
                const char *device_prefix = card_prefix;
                char device[128];

                DevList = temp;
                devname = snd_pcm_info_get_name(pcminfo);

                snprintf(name, sizeof(name), "%s-%s-%d", prefix_name(stream), cardid, dev);
                ConfigValueStr("alsa", name, &device_prefix);

                snprintf(name, sizeof(name), "%s, %s (CARD=%s,DEV=%d)",
                         cardname, devname, cardid, dev);
                snprintf(device, sizeof(device), "%sCARD=%s,DEV=%d",
                         device_prefix, cardid, dev);

                DevList[idx].name = strdup(name);
                DevList[idx].device = strdup(device);
                idx++;
            }
        }
        snd_ctl_close(handle);
    next_card:
        if(snd_card_next(&card) < 0) {
            ERR("snd_card_next failed\n");
            break;
        }
    }

    snd_pcm_info_free(pcminfo);
    snd_ctl_card_info_free(info);

    *count = idx;
    return DevList;
}


static int xrun_recovery(snd_pcm_t *handle, int err)
{
    err = snd_pcm_recover(handle, err, 1);
    if(err < 0)
        ERR("recover failed: %s\n", snd_strerror(err));
    return err;
}

static int verify_state(snd_pcm_t *handle)
{
    snd_pcm_state_t state = snd_pcm_state(handle);
    if(state == SND_PCM_STATE_DISCONNECTED)
        return -ENODEV;
    if(state == SND_PCM_STATE_XRUN)
    {
        int err = xrun_recovery(handle, -EPIPE);
        if(err < 0) return err;
    }
    else if(state == SND_PCM_STATE_SUSPENDED)
    {
        int err = xrun_recovery(handle, -ESTRPIPE);
        if(err < 0) return err;
    }

    return state;
}


static ALuint ALSAProc(ALvoid *ptr)
{
    ALCdevice *pDevice = (ALCdevice*)ptr;
    alsa_data *data = (alsa_data*)pDevice->ExtraData;
    const snd_pcm_channel_area_t *areas = NULL;
    snd_pcm_uframes_t update_size, num_updates;
    snd_pcm_sframes_t avail, commitres;
    snd_pcm_uframes_t offset, frames;
    char *WritePtr;
    int err;

    SetRTPriority();

    update_size = pDevice->UpdateSize;
    num_updates = pDevice->NumUpdates;
    while(!data->killNow)
    {
        int state = verify_state(data->pcmHandle);
        if(state < 0)
        {
            ERR("Invalid state detected: %s\n", snd_strerror(state));
            aluHandleDisconnect(pDevice);
            break;
        }

        avail = snd_pcm_avail_update(data->pcmHandle);
        if(avail < 0)
        {
            ERR("available update failed: %s\n", snd_strerror(avail));
            continue;
        }

        if((snd_pcm_uframes_t)avail > update_size*(num_updates+1))
        {
            WARN("available samples exceeds the buffer size\n");
            snd_pcm_reset(data->pcmHandle);
            continue;
        }

        // make sure there's frames to process
        if((snd_pcm_uframes_t)avail < update_size)
        {
            if(state != SND_PCM_STATE_RUNNING)
            {
                err = snd_pcm_start(data->pcmHandle);
                if(err < 0)
                {
                    ERR("start failed: %s\n", snd_strerror(err));
                    continue;
                }
            }
            if(snd_pcm_wait(data->pcmHandle, 1000) == 0)
                ERR("Wait timeout... buffer size too low?\n");
            continue;
        }
        avail -= avail%update_size;

        // it is possible that contiguous areas are smaller, thus we use a loop
        while(avail > 0)
        {
            frames = avail;

            err = snd_pcm_mmap_begin(data->pcmHandle, &areas, &offset, &frames);
            if(err < 0)
            {
                ERR("mmap begin error: %s\n", snd_strerror(err));
                break;
            }

            WritePtr = (char*)areas->addr + (offset * areas->step / 8);
            aluMixData(pDevice, WritePtr, frames);

            commitres = snd_pcm_mmap_commit(data->pcmHandle, offset, frames);
            if(commitres < 0 || (commitres-frames) != 0)
            {
                ERR("mmap commit error: %s\n",
                    snd_strerror(commitres >= 0 ? -EPIPE : commitres));
                break;
            }

            avail -= frames;
        }
    }

    return 0;
}

static ALuint ALSANoMMapProc(ALvoid *ptr)
{
    ALCdevice *pDevice = (ALCdevice*)ptr;
    alsa_data *data = (alsa_data*)pDevice->ExtraData;
    snd_pcm_sframes_t avail;
    char *WritePtr;

    SetRTPriority();

    while(!data->killNow)
    {
        int state = verify_state(data->pcmHandle);
        if(state < 0)
        {
            ERR("Invalid state detected: %s\n", snd_strerror(state));
            aluHandleDisconnect(pDevice);
            break;
        }

        WritePtr = data->buffer;
        avail = data->size / snd_pcm_frames_to_bytes(data->pcmHandle, 1);
        aluMixData(pDevice, WritePtr, avail);

        while(avail > 0)
        {
            int ret = snd_pcm_writei(data->pcmHandle, WritePtr, avail);
            switch (ret)
            {
            case -EAGAIN:
                continue;
            case -ESTRPIPE:
            case -EPIPE:
            case -EINTR:
                ret = snd_pcm_recover(data->pcmHandle, ret, 1);
                if(ret < 0)
                    avail = 0;
                break;
            default:
                if (ret >= 0)
                {
                    WritePtr += snd_pcm_frames_to_bytes(data->pcmHandle, ret);
                    avail -= ret;
                }
                break;
            }
            if (ret < 0)
            {
                ret = snd_pcm_prepare(data->pcmHandle);
                if(ret < 0)
                    break;
            }
        }
    }

    return 0;
}

static ALCenum alsa_open_playback(ALCdevice *device, const ALCchar *deviceName)
{
    const char *driver = "default";
    alsa_data *data;
    int i;

    ConfigValueStr("alsa", "device", &driver);

    if(!deviceName)
        deviceName = alsaDevice;
    else if(strcmp(deviceName, alsaDevice) != 0)
    {
        size_t idx;

        if(!allDevNameMap)
            allDevNameMap = probe_devices(SND_PCM_STREAM_PLAYBACK, &numDevNames);

        for(idx = 0;idx < numDevNames;idx++)
        {
            if(allDevNameMap[idx].name &&
               strcmp(deviceName, allDevNameMap[idx].name) == 0)
            {
                if(idx > 0)
                    driver = allDevNameMap[idx].device;
                break;
            }
        }
        if(idx == numDevNames)
            return ALC_INVALID_VALUE;
    }

    data = (alsa_data*)calloc(1, sizeof(alsa_data));

    i = snd_pcm_open(&data->pcmHandle, driver, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
    if(i >= 0)
    {
        i = snd_pcm_nonblock(data->pcmHandle, 0);
        if(i < 0)
            snd_pcm_close(data->pcmHandle);
    }
    if(i < 0)
    {
        free(data);
        ERR("Could not open playback device '%s': %s\n", driver, snd_strerror(i));
        return ALC_OUT_OF_MEMORY;
    }

    device->szDeviceName = strdup(deviceName);
    device->ExtraData = data;
    return ALC_NO_ERROR;
}

static void alsa_close_playback(ALCdevice *device)
{
    alsa_data *data = (alsa_data*)device->ExtraData;

    snd_pcm_close(data->pcmHandle);
    free(data);
    device->ExtraData = NULL;
}

static ALCboolean alsa_reset_playback(ALCdevice *device)
{
    alsa_data *data = (alsa_data*)device->ExtraData;
    snd_pcm_uframes_t periodSizeInFrames;
    unsigned int periodLen, bufferLen;
    snd_pcm_sw_params_t *sp = NULL;
    snd_pcm_hw_params_t *p = NULL;
    snd_pcm_access_t access;
    snd_pcm_format_t format;
    unsigned int periods;
    unsigned int rate;
    int allowmmap;
    char *err;
    int i;


    format = -1;
    switch(device->FmtType)
    {
        case DevFmtByte:
            format = SND_PCM_FORMAT_S8;
            break;
        case DevFmtUByte:
            format = SND_PCM_FORMAT_U8;
            break;
        case DevFmtShort:
            format = SND_PCM_FORMAT_S16;
            break;
        case DevFmtUShort:
            format = SND_PCM_FORMAT_U16;
            break;
        case DevFmtInt:
            format = SND_PCM_FORMAT_S32;
            break;
        case DevFmtUInt:
            format = SND_PCM_FORMAT_U32;
            break;
        case DevFmtFloat:
            format = SND_PCM_FORMAT_FLOAT;
            break;
    }

    allowmmap = GetConfigValueBool("alsa", "mmap", 1);
    periods = device->NumUpdates;
    periodLen = (ALuint64)device->UpdateSize * 1000000 / device->Frequency;
    bufferLen = periodLen * periods;
    rate = device->Frequency;

    err = NULL;
    snd_pcm_hw_params_malloc(&p);

    if((i=snd_pcm_hw_params_any(data->pcmHandle, p)) < 0)
        err = "any";
    /* set interleaved access */
    if(i >= 0 && (!allowmmap || (i=snd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0))
    {
        if(periods > 2)
        {
            periods--;
            bufferLen = periodLen * periods;
        }
        if((i=snd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
            err = "set access";
    }
    /* test and set format (implicitly sets sample bits) */
    if(i >= 0 && (i=snd_pcm_hw_params_test_format(data->pcmHandle, p, format)) < 0)
    {
        static const struct {
            snd_pcm_format_t format;
            enum DevFmtType fmttype;
        } formatlist[] = {
            { SND_PCM_FORMAT_FLOAT, DevFmtFloat  },
            { SND_PCM_FORMAT_S32,   DevFmtInt    },
            { SND_PCM_FORMAT_U32,   DevFmtUInt   },
            { SND_PCM_FORMAT_S16,   DevFmtShort  },
            { SND_PCM_FORMAT_U16,   DevFmtUShort },
            { SND_PCM_FORMAT_S8,    DevFmtByte   },
            { SND_PCM_FORMAT_U8,    DevFmtUByte  },
        };
        size_t k;

        err = "test format";
        for(k = 0;k < sizeof(formatlist)/sizeof(formatlist[0]);k++)
        {
            format = formatlist[k].format;
            if((i=snd_pcm_hw_params_test_format(data->pcmHandle, p, format)) >= 0)
            {
                device->FmtType = formatlist[k].fmttype;
                break;
            }
        }
    }
    if(i >= 0 && (i=snd_pcm_hw_params_set_format(data->pcmHandle, p, format)) < 0)
        err = "set format";
    /* test and set channels (implicitly sets frame bits) */
    if(i >= 0 && (i=snd_pcm_hw_params_test_channels(data->pcmHandle, p, ChannelsFromDevFmt(device->FmtChans))) < 0)
    {
        static const enum DevFmtChannels channellist[] = {
            DevFmtStereo,
            DevFmtQuad,
            DevFmtX51,
            DevFmtX71,
            DevFmtMono,
        };
        size_t k;

        err = "test channels";
        for(k = 0;k < sizeof(channellist)/sizeof(channellist[0]);k++)
        {
            if((i=snd_pcm_hw_params_test_channels(data->pcmHandle, p, ChannelsFromDevFmt(channellist[k]))) >= 0)
            {
                device->FmtChans = channellist[k];
                break;
            }
        }
    }
    if(i >= 0 && (i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, ChannelsFromDevFmt(device->FmtChans))) < 0)
        err = "set channels";
    if(i >= 0 && (i=snd_pcm_hw_params_set_rate_resample(data->pcmHandle, p, 0)) < 0)
    {
        ERR("Failed to disable ALSA resampler\n");
        i = 0;
    }
    /* set rate (implicitly constrains period/buffer parameters) */
    if(i >= 0 && (i=snd_pcm_hw_params_set_rate_near(data->pcmHandle, p, &rate, NULL)) < 0)
        err = "set rate near";
    /* set buffer time (implicitly constrains period/buffer parameters) */
    if(i >= 0 && (i=snd_pcm_hw_params_set_buffer_time_near(data->pcmHandle, p, &bufferLen, NULL)) < 0)
        err = "set buffer time near";
    /* set period time (implicitly sets buffer size/bytes/time and period size/bytes) */
    if(i >= 0 && (i=snd_pcm_hw_params_set_period_time_near(data->pcmHandle, p, &periodLen, NULL)) < 0)
        err = "set period time near";
    /* install and prepare hardware configuration */
    if(i >= 0 && (i=snd_pcm_hw_params(data->pcmHandle, p)) < 0)
        err = "set params";
    /* retrieve configuration info */
    if(i >= 0 && (i=snd_pcm_hw_params_get_access(p, &access)) < 0)
        err = "get access";
    if(i >= 0 && (i=snd_pcm_hw_params_get_period_size(p, &periodSizeInFrames, NULL)) < 0)
        err = "get period size";
    if(i >= 0 && (i=snd_pcm_hw_params_get_periods(p, &periods, NULL)) < 0)
        err = "get periods";
    if(i < 0)
    {
        ERR("%s failed: %s\n", err, snd_strerror(i));
        snd_pcm_hw_params_free(p);
        return ALC_FALSE;
    }

    snd_pcm_hw_params_free(p);

    err = NULL;
    snd_pcm_sw_params_malloc(&sp);

    if((i=snd_pcm_sw_params_current(data->pcmHandle, sp)) != 0)
        err = "sw current";
    if(i == 0 && (i=snd_pcm_sw_params_set_avail_min(data->pcmHandle, sp, periodSizeInFrames)) != 0)
        err = "sw set avail min";
    if(i == 0 && (i=snd_pcm_sw_params_set_stop_threshold(data->pcmHandle, sp, periodSizeInFrames*periods)) != 0)
        err = "sw set stop threshold";
    if(i == 0 && (i=snd_pcm_sw_params(data->pcmHandle, sp)) != 0)
        err = "sw set params";
    if(i != 0)
    {
        ERR("%s failed: %s\n", err, snd_strerror(i));
        snd_pcm_sw_params_free(sp);
        return ALC_FALSE;
    }

    snd_pcm_sw_params_free(sp);

    device->Frequency = rate;
    SetDefaultChannelOrder(device);

    data->size = snd_pcm_frames_to_bytes(data->pcmHandle, periodSizeInFrames);
    if(access == SND_PCM_ACCESS_RW_INTERLEAVED)
    {
        /* Increase periods by one, since the temp buffer counts as an extra
         * period */
        periods++;
        data->buffer = malloc(data->size);
        if(!data->buffer)
        {
            ERR("buffer malloc failed\n");
            return ALC_FALSE;
        }
        device->UpdateSize = periodSizeInFrames;
        device->NumUpdates = periods;
        data->thread = StartThread(ALSANoMMapProc, device);
    }
    else
    {
        i = snd_pcm_prepare(data->pcmHandle);
        if(i < 0)
        {
            ERR("prepare error: %s\n", snd_strerror(i));
            return ALC_FALSE;
        }
        device->UpdateSize = periodSizeInFrames;
        device->NumUpdates = periods;
        data->thread = StartThread(ALSAProc, device);
    }
    if(data->thread == NULL)
    {
        ERR("Could not create playback thread\n");
        free(data->buffer);
        data->buffer = NULL;
        return ALC_FALSE;
    }

    return ALC_TRUE;
}

static void alsa_stop_playback(ALCdevice *device)
{
    alsa_data *data = (alsa_data*)device->ExtraData;

    if(data->thread)
    {
        data->killNow = 1;
        StopThread(data->thread);
        data->thread = NULL;
    }
    data->killNow = 0;
    free(data->buffer);
    data->buffer = NULL;
}


static ALCenum alsa_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
{
    const char *driver = "default";
    snd_pcm_hw_params_t *p;
    snd_pcm_uframes_t bufferSizeInFrames;
    snd_pcm_uframes_t periodSizeInFrames;
    snd_pcm_format_t format;
    ALuint frameSize;
    alsa_data *data;
    char *err;
    int i;

    ConfigValueStr("alsa", "capture", &driver);

    if(!allCaptureDevNameMap)
        allCaptureDevNameMap = probe_devices(SND_PCM_STREAM_CAPTURE, &numCaptureDevNames);

    if(!deviceName)
        deviceName = allCaptureDevNameMap[0].name;
    else
    {
        size_t idx;

        for(idx = 0;idx < numCaptureDevNames;idx++)
        {
            if(allCaptureDevNameMap[idx].name &&
               strcmp(deviceName, allCaptureDevNameMap[idx].name) == 0)
            {
                if(idx > 0)
                    driver = allCaptureDevNameMap[idx].device;
                break;
            }
        }
        if(idx == numCaptureDevNames)
            return ALC_INVALID_VALUE;
    }

    data = (alsa_data*)calloc(1, sizeof(alsa_data));

    i = snd_pcm_open(&data->pcmHandle, driver, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);
    if(i < 0)
    {
        ERR("Could not open capture device '%s': %s\n", driver, snd_strerror(i));
        free(data);
        return ALC_INVALID_VALUE;
    }

    format = -1;
    switch(pDevice->FmtType)
    {
        case DevFmtByte:
            format = SND_PCM_FORMAT_S8;
            break;
        case DevFmtUByte:
            format = SND_PCM_FORMAT_U8;
            break;
        case DevFmtShort:
            format = SND_PCM_FORMAT_S16;
            break;
        case DevFmtUShort:
            format = SND_PCM_FORMAT_U16;
            break;
        case DevFmtInt:
            format = SND_PCM_FORMAT_S32;
            break;
        case DevFmtUInt:
            format = SND_PCM_FORMAT_U32;
            break;
        case DevFmtFloat:
            format = SND_PCM_FORMAT_FLOAT;
            break;
    }

    err = NULL;
    bufferSizeInFrames = maxu(pDevice->UpdateSize*pDevice->NumUpdates,
                              100*pDevice->Frequency/1000);
    periodSizeInFrames = minu(bufferSizeInFrames, 50*pDevice->Frequency/1000);
    snd_pcm_hw_params_malloc(&p);

    if((i=snd_pcm_hw_params_any(data->pcmHandle, p)) < 0)
        err = "any";
    /* set interleaved access */
    if(i >= 0 && (i=snd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
        err = "set access";
    /* set format (implicitly sets sample bits) */
    if(i >= 0 && (i=snd_pcm_hw_params_set_format(data->pcmHandle, p, format)) < 0)
        err = "set format";
    /* set channels (implicitly sets frame bits) */
    if(i >= 0 && (i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, ChannelsFromDevFmt(pDevice->FmtChans))) < 0)
        err = "set channels";
    /* set rate (implicitly constrains period/buffer parameters) */
    if(i >= 0 && (i=snd_pcm_hw_params_set_rate(data->pcmHandle, p, pDevice->Frequency, 0)) < 0)
        err = "set rate near";
    /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
    if(i >= 0 && (i=snd_pcm_hw_params_set_buffer_size_near(data->pcmHandle, p, &bufferSizeInFrames)) < 0)
        err = "set buffer size near";
    /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
    if(i >= 0 && (i=snd_pcm_hw_params_set_period_size_near(data->pcmHandle, p, &periodSizeInFrames, NULL)) < 0)
        err = "set period size near";
    /* install and prepare hardware configuration */
    if(i >= 0 && (i=snd_pcm_hw_params(data->pcmHandle, p)) < 0)
        err = "set params";
    if(i < 0)
    {
        ERR("%s failed: %s\n", err, snd_strerror(i));
        snd_pcm_hw_params_free(p);
        goto error;
    }

    if((i=snd_pcm_hw_params_get_period_size(p, &bufferSizeInFrames, NULL)) < 0)
    {
        ERR("get size failed: %s\n", snd_strerror(i));
        snd_pcm_hw_params_free(p);
        goto error;
    }

    snd_pcm_hw_params_free(p);

    frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);

    data->ring = CreateRingBuffer(frameSize, pDevice->UpdateSize*pDevice->NumUpdates);
    if(!data->ring)
    {
        ERR("ring buffer create failed\n");
        goto error;
    }

    data->size = snd_pcm_frames_to_bytes(data->pcmHandle, bufferSizeInFrames);
    data->buffer = malloc(data->size);
    if(!data->buffer)
    {
        ERR("buffer malloc failed\n");
        goto error;
    }

    pDevice->szDeviceName = strdup(deviceName);

    pDevice->ExtraData = data;
    return ALC_NO_ERROR;

error:
    free(data->buffer);
    DestroyRingBuffer(data->ring);
    snd_pcm_close(data->pcmHandle);
    free(data);

    pDevice->ExtraData = NULL;
    return ALC_INVALID_VALUE;
}

static void alsa_close_capture(ALCdevice *pDevice)
{
    alsa_data *data = (alsa_data*)pDevice->ExtraData;

    snd_pcm_close(data->pcmHandle);
    DestroyRingBuffer(data->ring);

    free(data->buffer);
    free(data);
    pDevice->ExtraData = NULL;
}

static void alsa_start_capture(ALCdevice *Device)
{
    alsa_data *data = (alsa_data*)Device->ExtraData;
    int err;

    err = snd_pcm_start(data->pcmHandle);
    if(err < 0)
    {
        ERR("start failed: %s\n", snd_strerror(err));
        aluHandleDisconnect(Device);
    }
    else
        data->doCapture = AL_TRUE;
}

static void alsa_stop_capture(ALCdevice *Device)
{
    alsa_data *data = (alsa_data*)Device->ExtraData;
    snd_pcm_drain(data->pcmHandle);
    data->doCapture = AL_FALSE;
}

static ALCenum alsa_capture_samples(ALCdevice *Device, ALCvoid *Buffer, ALCuint Samples)
{
    alsa_data *data = (alsa_data*)Device->ExtraData;
    ReadRingBuffer(data->ring, Buffer, Samples);
    return ALC_NO_ERROR;
}

static ALCuint alsa_available_samples(ALCdevice *Device)
{
    alsa_data *data = (alsa_data*)Device->ExtraData;
    snd_pcm_sframes_t avail;

    avail = (Device->Connected ? snd_pcm_avail_update(data->pcmHandle) : 0);
    if(avail < 0)
    {
        ERR("avail update failed: %s\n", snd_strerror(avail));

        if((avail=snd_pcm_recover(data->pcmHandle, avail, 1)) >= 0)
        {
            if(data->doCapture)
                avail = snd_pcm_start(data->pcmHandle);
            if(avail >= 0)
                avail = snd_pcm_avail_update(data->pcmHandle);
        }
        if(avail < 0)
        {
            ERR("restore error: %s\n", snd_strerror(avail));
            aluHandleDisconnect(Device);
        }
    }
    while(avail > 0)
    {
        snd_pcm_sframes_t amt;

        amt = snd_pcm_bytes_to_frames(data->pcmHandle, data->size);
        if(avail < amt) amt = avail;

        amt = snd_pcm_readi(data->pcmHandle, data->buffer, amt);
        if(amt < 0)
        {
            ERR("read error: %s\n", snd_strerror(amt));

            if(amt == -EAGAIN)
                continue;
            if((amt=snd_pcm_recover(data->pcmHandle, amt, 1)) >= 0)
            {
                if(data->doCapture)
                    amt = snd_pcm_start(data->pcmHandle);
                if(amt >= 0)
                    amt = snd_pcm_avail_update(data->pcmHandle);
            }
            if(amt < 0)
            {
                ERR("restore error: %s\n", snd_strerror(amt));
                aluHandleDisconnect(Device);
                break;
            }
            avail = amt;
            continue;
        }

        WriteRingBuffer(data->ring, data->buffer, amt);
        avail -= amt;
    }

    return RingBufferSize(data->ring);
}


static const BackendFuncs alsa_funcs = {
    alsa_open_playback,
    alsa_close_playback,
    alsa_reset_playback,
    alsa_stop_playback,
    alsa_open_capture,
    alsa_close_capture,
    alsa_start_capture,
    alsa_stop_capture,
    alsa_capture_samples,
    alsa_available_samples
};

ALCboolean alc_alsa_init(BackendFuncs *func_list)
{
    if(!alsa_load())
        return ALC_FALSE;
    *func_list = alsa_funcs;
    return ALC_TRUE;
}

void alc_alsa_deinit(void)
{
    ALuint i;

    for(i = 0;i < numDevNames;++i)
        free(allDevNameMap[i].device);
    free(allDevNameMap);
    allDevNameMap = NULL;
    numDevNames = 0;

    for(i = 0;i < numCaptureDevNames;++i)
        free(allCaptureDevNameMap[i].device);
    free(allCaptureDevNameMap);
    allCaptureDevNameMap = NULL;
    numCaptureDevNames = 0;

#ifdef HAVE_DYNLOAD
    if(alsa_handle)
        CloseLib(alsa_handle);
    alsa_handle = NULL;
#endif
}

void alc_alsa_probe(enum DevProbe type)
{
    ALuint i;

    switch(type)
    {
        case DEVICE_PROBE:
            AppendDeviceList(alsaDevice);
            break;

        case ALL_DEVICE_PROBE:
            for(i = 0;i < numDevNames;++i)
                free(allDevNameMap[i].device);

            free(allDevNameMap);
            allDevNameMap = probe_devices(SND_PCM_STREAM_PLAYBACK, &numDevNames);

            for(i = 0;i < numDevNames;++i)
                AppendAllDeviceList(allDevNameMap[i].name);
            break;

        case CAPTURE_DEVICE_PROBE:
            for(i = 0;i < numCaptureDevNames;++i)
                free(allCaptureDevNameMap[i].device);

            free(allCaptureDevNameMap);
            allCaptureDevNameMap = probe_devices(SND_PCM_STREAM_CAPTURE, &numCaptureDevNames);

            for(i = 0;i < numCaptureDevNames;++i)
                AppendCaptureDeviceList(allCaptureDevNameMap[i].name);
            break;
    }
}