summaryrefslogtreecommitdiffstats
path: root/kmix/mixer_alsa9.cpp
blob: dc4935c4e57ae009993492ce493b416ad28e498f (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
/*
 *              KMix -- KDE's full featured mini mixer
 *              Alsa 0.9x and 1.0 - Based on original alsamixer code
 *              from alsa-project ( www/alsa-project.org )
 *
 *
 * Copyright (C) 2002 Helio Chissini de Castro <[email protected]>
 *               2004 Christian Esken <[email protected]>
 *
 * This program 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 program 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 program; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

// STD Headers
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <assert.h>
#include <tqsocketnotifier.h>

extern "C"
{
	#include <alsa/asoundlib.h>
}

// KDE Headers
#include <klocale.h>
#include <kdebug.h>

// Local Headers
#include "mixer_alsa.h"
//#include "mixer.h"
#include "volume.h"
// #define if you want MUCH debugging output
//#define ALSA_SWITCH_DEBUG
//#define KMIX_ALSA_VOLUME_DEBUG

Mixer_Backend*
ALSA_getMixer( int device )
{
	Mixer_Backend *l_mixer;
        l_mixer = new Mixer_ALSA( device );
	return l_mixer;
}

Mixer_ALSA::Mixer_ALSA( int device ) : Mixer_Backend( device )
{
    m_fds = 0;
    m_sns = 0;
    _handle = 0;
    _initialUpdate = true;
}

Mixer_ALSA::~Mixer_ALSA()
{
  close();
}

int
Mixer_ALSA::identify( snd_mixer_selem_id_t *sid )
{
	TQString name = snd_mixer_selem_id_get_name( sid );

	if ( name == "Master" ) return MixDevice::VOLUME;
        if ( name == "Capture" ) return MixDevice::RECMONITOR;
	if ( name == "Master Mono" ) return MixDevice::VOLUME;
        if ( name == "PC Speaker" ) return MixDevice::VOLUME;
        if ( name == "Music" || name == "Synth" || name == "FM" ) return MixDevice::MIDI;
	if ( name.find( "Headphone", 0, false ) != -1 ) return MixDevice::HEADPHONE;
	if ( name == "Bass" ) return MixDevice::BASS;
	if ( name == "Treble" ) return MixDevice::TREBLE;
	if ( name == "CD" ) return MixDevice::CD;
	if ( name == "Video" ) return MixDevice::VIDEO;
	if ( name == "PCM" || name == "Wave" ) return MixDevice::AUDIO;
	if ( name == "Surround" ) return MixDevice::SURROUND_BACK;
	if ( name == "Center" ) return MixDevice::SURROUND_CENTERFRONT;
	if ( name.find( "ac97", 0, false ) != -1 ) return MixDevice::AC97;
	if ( name.find( "coaxial", 0, false ) != -1 ) return MixDevice::DIGITAL;
	if ( name.find( "optical", 0, false ) != -1 ) return MixDevice::DIGITAL;
	if ( name.find( "IEC958", 0, false ) != -1 ) return MixDevice::DIGITAL;
	if ( name.find( "Mic" ) != -1 ) return MixDevice::MICROPHONE;
	if ( name.find( "LFE" ) != -1 ) return MixDevice::SURROUND_LFE;
        if ( name.find( "Monitor" ) != -1 ) return MixDevice::RECMONITOR;
	if ( name.find( "3D", 0, false ) != -1 ) return MixDevice::SURROUND;  // Should be probably some own icon

	return MixDevice::EXTERNAL;
}

int
Mixer_ALSA::open()
{
    bool virginOpen = m_mixDevices.isEmpty();
    bool validDevice = false;
    bool masterChosen = false;
    int err;

    snd_ctl_t *ctl_handle;
    snd_ctl_card_info_t *hw_info;
    snd_ctl_card_info_alloca(&hw_info);

    snd_mixer_elem_t *elem;
    snd_mixer_selem_id_t *sid;
    snd_mixer_selem_id_alloca( &sid );

    // Card information
    if ((unsigned)m_devnum > 31) m_devnum = -1;
    devName = m_devnum == -1 ? "default" : TQString("hw:%1").tqarg(m_devnum);

    TQString probeMessage;

    if (virginOpen)
	probeMessage += "Trying ALSA Device '" + devName + "': ";

    if ( ( err = snd_ctl_open ( &ctl_handle, devName.latin1(), 0 ) ) < 0 )
    {
	kdDebug(67100) << probeMessage << "not found: snd_ctl_open err=" << snd_strerror(err) << endl;
	//_stateMessage = errorText( Mixer::ERR_NODEV );
	return Mixer::ERR_OPEN;
    }

    if ( ( err = snd_ctl_card_info ( ctl_handle, hw_info ) ) < 0 )
    {
	kdDebug(67100) << probeMessage << "not found: snd_ctl_card_info err=" << snd_strerror(err) << endl;
	//_stateMessage = errorText( Mixer::ERR_READ );
	snd_ctl_close( ctl_handle );
	return Mixer::ERR_READ;
    }

    // Device and mixer names
    const char* mixer_card_name =  snd_ctl_card_info_get_name( hw_info );
    //mixer_device_name = snd_ctl_card_info_get_mixername( hw_info );
    // Copy the name of kmix mixer from card name (mixername is rumoured to be not that good)
    m_mixerName = mixer_card_name;
    if (m_devnum == -1) m_devnum = snd_card_get_index(snd_ctl_card_info_get_id(hw_info));
    if (m_devnum < 0) m_devnum = -1;

    snd_ctl_close( ctl_handle );

    /* open mixer device */

    //kdDebug(67100) << "IN  Mixer_ALSA snd_mixer_open()" << endl;
    if ( ( err = snd_mixer_open ( &_handle, 0 ) ) < 0 )
    {
	kdDebug(67100) << probeMessage << "not found: snd_mixer_open err=" << snd_strerror(err) << endl;
	//errormsg( Mixer::ERR_NODEV );
	_handle = 0;
	return Mixer::ERR_NODEV; // if we cannot open the mixer, we have no devices
    }
    //kdDebug(67100) << "OUT Mixer_ALSA snd_mixer_open()" << endl;

    if ( ( err = snd_mixer_attach ( _handle, devName.latin1() ) ) < 0 )
    {
	kdDebug(67100) << probeMessage << "not found: snd_mixer_attach err=" << snd_strerror(err) << endl;
	//errormsg( Mixer::ERR_PERM );
	return Mixer::ERR_OPEN;
    }

    if ( ( err = snd_mixer_selem_register ( _handle, NULL, NULL ) ) < 0 )
    {
	kdDebug(67100) << probeMessage << "not found: snd_mixer_selem_register err=" << snd_strerror(err) << endl;
	//errormsg( Mixer::ERR_READ );
	return Mixer::ERR_READ;
    }

    if ( ( err = snd_mixer_load ( _handle ) ) < 0 )
    {
	kdDebug(67100) << probeMessage << "not found: snd_mixer_load err=" << snd_strerror(err) << endl;
	//errormsg( Mixer::ERR_READ );
	close();
	return Mixer::ERR_READ;
    }

    kdDebug(67100) << probeMessage << "found" << endl;

    unsigned int mixerIdx = 0;
    for ( elem = snd_mixer_first_elem( _handle ); elem; elem = snd_mixer_elem_next( elem ), mixerIdx++ )
    {
	// If element is not active, just skip
	if ( ! snd_mixer_selem_is_active ( elem ) ) {
	    // ...but we still want to insert a null value into our mixer element
	    // list so that the list indexes match up.
	    mixer_elem_list.append( 0 );
	    mixer_sid_list.append( 0 );
	    continue;
	}


	sid = (snd_mixer_selem_id_t*)malloc(snd_mixer_selem_id_sizeof());  // I believe *we* must malloc it for ourself
	snd_mixer_selem_get_id( elem, sid );

	bool canRecord = false;
	bool canMute = false;
	bool canCapture = false;
	long maxVolumePlay= 0, minVolumePlay= 0;
	long maxVolumeRec = 0, minVolumeRec = 0;
	validDevice = true;

	snd_mixer_selem_get_playback_volume_range( elem, &minVolumePlay, &maxVolumePlay );
	snd_mixer_selem_get_capture_volume_range( elem, &minVolumeRec , &maxVolumeRec  );
	// New mix device
	MixDevice::ChannelType ct = (MixDevice::ChannelType)identify( sid );
/*
        if (!masterChosen && ct==MixDevice::VOLUME) {
           // Determine a nicer MasterVolume
	   m_masterDevice = mixerIdx;
           masterChosen = true;
        }
*/
	if( virginOpen )
	{
	    MixDevice::DeviceCategory cc = MixDevice::UNDEFINED;

		//kdDebug() << "--- Loop: name=" << snd_mixer_selem_id_get_name( sid ) << " , mixerIdx=" << mixerIdx << "------------" << endl;

	    Volume* volPlay = 0, *volCapture = 0;
	    TQPtrList<TQString> enumList;
	    if ( snd_mixer_selem_is_enumerated(elem) ) {
		cc = MixDevice::ENUM;
		volPlay = new Volume(); // Dummy, unused
		volCapture = new Volume();
		mixer_elem_list.append( elem );
		mixer_sid_list.append( sid );

		// --- get Enum names START ---
		int numEnumitems = snd_mixer_selem_get_enum_items(elem);
		if ( numEnumitems > 0 ) {
		  // OK. no error
		  for (int iEnum = 0; iEnum<numEnumitems; iEnum++ ) {
		    char buffer[100];
		    int ret = snd_mixer_selem_get_enum_item_name(elem, iEnum, 99, buffer);
		    if ( ret == 0 ) {
		      TQString* enumName = new TQString(buffer);
		      //enumName->append(buffer);
		      enumList.append( enumName);
		    } // enumName could be read succesfully
		  } // for all enum items of this device
		} // no error in reading enum list
		else {
		  // 0 items or Error code => ignore this entry
		}
		// --- get Enum names END ---
	    } // is an enum

	    else {
		Volume::ChannelMask chn = Volume::MNONE;
		Volume::ChannelMask chnTmp;
		if ( snd_mixer_selem_has_playback_volume(elem) ) {
			//kdDebug(67100) << "has_playback_volume()" << endl;
			chnTmp = snd_mixer_selem_is_playback_mono ( elem )
				? Volume::MLEFT : (Volume::ChannelMask)(Volume::MLEFT | Volume::MRIGHT);
			chn = (Volume::ChannelMask) (chn | chnTmp);
			cc = MixDevice::SLIDER;
			volPlay = new Volume( chn, maxVolumePlay, minVolumePlay );
		} else {
			volPlay = new Volume();
		}
		if ( snd_mixer_selem_has_capture_volume(elem) ) {
			//kdDebug(67100) << "has_capture_volume()" << endl;
			chnTmp = snd_mixer_selem_is_capture_mono( elem )
				? Volume::MLEFT : (Volume::ChannelMask)(Volume::MLEFT | Volume::MRIGHT );
			chn = (Volume::ChannelMask) (chn | chnTmp);
			cc = MixDevice::SLIDER;
			canCapture = true;
			volCapture = new Volume( chn, maxVolumeRec, minVolumeRec, true );
		} else {
			volCapture = new Volume();
		}

		/* Create Volume object. If there is no volume on this device,
		 * it will be created with maxVolume == 0 && minVolume == 0 */
		mixer_elem_list.append( elem );
		mixer_sid_list.append( sid );

		if ( snd_mixer_selem_has_playback_switch ( elem ) ) {
			//kdDebug(67100) << "has_playback_switch()" << endl;
			canMute = true;
		}
		if ( snd_mixer_selem_has_capture_switch ( elem ) )	{
			//kdDebug(67100) << "has_capture_switch()" << endl;
			canRecord = true;
		}
		if ( snd_mixer_selem_has_common_switch ( elem ) ) {
			//kdDebug(67100) << "has_common_switch()" << endl;
			canMute = true;
			canRecord = true;
		}

		if ( /*snd_mixer_selem_has_common_switch ( elem ) || */
                     cc == MixDevice::UNDEFINED )
		{
		    // Everything unknown is handled as switch
		    cc = MixDevice::SWITCH;
		}
	    } // is ordinary mixer element (NOT an enum)

		MixDevice* md = new MixDevice( mixerIdx,
				   *volPlay,
					canRecord,
				   canMute,
				   snd_mixer_selem_id_get_name( sid ),
				   ct,
				   cc );

			m_mixDevices.append( md );


		if (!masterChosen && ct==MixDevice::VOLUME) {
		// Determine a nicer MasterVolume
		m_recommendedMaster = md;
		masterChosen = true;
		}

		if ( canCapture && !canRecord ) {
			MixDevice *mdCapture =
		    	new MixDevice( mixerIdx,
				   *volCapture,
					true,
				   canMute,
				   snd_mixer_selem_id_get_name( sid ),
				   ct,
				   cc );
			m_mixDevices.append( mdCapture );
		}

		if ( enumList.count() > 0 ) {
		  int maxEnumId= enumList.count();
		  TQPtrList<TQString>& enumValuesRef = md->enumValues(); // retrieve a ref
		  for (int i=0; i<maxEnumId; i++ ) {
		    // we have an enum. Lets set the names of the enum items in the MixDevice
		    // the enum names are assumed to be static!
		    enumValuesRef.append(enumList.at(i) );
		  }
		}
		//kdDebug(67100) << "ALSA create MDW, vol= " << *vol << endl;
		delete volPlay;
		delete volCapture;
	    } // virginOpen
	    else
	    {
			MixDevice* md;
			bool found = false;
    		for ( md = m_mixDevices.first(); md != 0; md = m_mixDevices.next() ) {
				if ( md->num() == mixerIdx ) {
					found = true;
					writeVolumeToHW( mixerIdx, md->getVolume() );
				}
			}
			if( !found )
			{
				return Mixer::ERR_INCOMPATIBLESET;
			}
	    } // !virginOpen
    } // for all elems

    /**************************************************************************************
    // If no devices are supported by this soundcard, return "NO Devices"
       It is VERY important to return THIS error code, so that the caller knows, that the
       the device exists.
       This is used for scanning for existing soundcard devices, see MixerToolBox::initMixer().
    ***************************************************************************************/
    if ( !validDevice )
    {
	return Mixer::ERR_NODEV;
    }

    // Copy the name of kmix mixer from card name
    // Real name of mixer is not too good
    m_mixerName = mixer_card_name;

    // return with success
    m_isOpen = true;

    /* setup for select on stdin and the mixer fd */
    if ((m_count = snd_mixer_poll_descriptors_count(_handle)) < 0) {
	kdDebug(67100) << "Mixer_ALSA::poll() , snd_mixer_poll_descriptors_count() err=" <<  m_count << "\n";
	return Mixer::ERR_OPEN;
    }

    //kdDebug(67100) << "Mixer_ALSA::prepareUpdate() 2\n";

    m_fds = (struct pollfd*)calloc(m_count, sizeof(struct pollfd));
    if (m_fds == NULL) {
	kdDebug(67100) << "Mixer_ALSA::poll() , calloc() = null" << "\n";
        return Mixer::ERR_OPEN;
    }

    m_fds->events = POLLIN;
    if ((err = snd_mixer_poll_descriptors(_handle, m_fds, m_count)) < 0) {
	kdDebug(67100) << "Mixer_ALSA::poll() , snd_mixer_poll_descriptors_count() err=" <<  err << "\n";
        return Mixer::ERR_OPEN;
    }
    if (err != m_count) {
	kdDebug(67100) << "Mixer_ALSA::poll() , snd_mixer_poll_descriptors_count() err=" << err << " m_count=" <<  m_count << "\n";
        return Mixer::ERR_OPEN;
    }

    return 0;
}

void Mixer_ALSA::prepareSignalling( Mixer *mixer )
{
    assert( !m_sns );

    m_sns = new TQSocketNotifier*[m_count];
    for ( int i = 0; i < m_count; ++i )
    {
        kdDebug() << "socket " << i << endl;
        m_sns[i] = new TQSocketNotifier(m_fds[i].fd, TQSocketNotifier::Read);
        mixer->connect(m_sns[i], TQT_SIGNAL(activated(int)), mixer, TQT_SLOT(readSetFromHW()));
    }
}

void Mixer_ALSA::removeSignalling()
{
  if ( m_fds )
      free( m_fds );
  m_fds = 0;

  if ( m_sns )
  {
      for ( int i = 0; i < m_count; i++ )
          delete m_sns[i];
      delete [] m_sns;
      m_sns = 0;
  }
}

int
Mixer_ALSA::close()
{
  int ret=0;
  m_isOpen = false;
  if ( _handle != 0 )
  {
    //kdDebug(67100) << "IN  Mixer_ALSA::close()" << endl;
    snd_mixer_free ( _handle );
    if ( ( ret = snd_mixer_detach ( _handle, devName.latin1() ) ) < 0 )
    {
        kdDebug(67100) << "snd_mixer_detach err=" << snd_strerror(ret) << endl;
    }
    int ret2 = 0;
    if ( ( ret2 = snd_mixer_close ( _handle ) ) < 0 )
    {
        kdDebug(67100) << "snd_mixer_close err=" << snd_strerror(ret2) << endl;
	if ( ret == 0 ) ret = ret2; // no error before => use current error code
    }

    _handle = 0;
    //kdDebug(67100) << "OUT Mixer_ALSA::close()" << endl;

  }

  mixer_elem_list.clear();
  mixer_sid_list.clear();
  m_mixDevices.clear();

  removeSignalling();

  return ret;
}


snd_mixer_elem_t* Mixer_ALSA::getMixerElem(int devnum) {
	snd_mixer_elem_t* elem = 0;
	if ( ! m_isOpen ) return elem; // unplugging guard

	if ( int( mixer_sid_list.count() ) > devnum ) {
		snd_mixer_selem_id_t * sid = mixer_sid_list[ devnum ];
		// The next line (hopefully) only finds selem's, not elem's.
		elem = snd_mixer_find_selem(_handle, sid);

		if ( elem == 0 ) {
			// !! Check, whether the warning should be omitted. Probably
			//    Route controls are non-simple elements.
			kdDebug(67100) << "Error finding mixer element " << devnum << endl;
		}
	}
	return elem;

/*
 I would have liked to use the following trivial implementation instead of the
 code above. But it will also return elem's. which are not selem's. As there is
 no way to check an elem's type (e.g. elem->type == SND_MIXER_ELEM_SIMPLE), callers
 of getMixerElem() cannot check the type. :-(
	snd_mixer_elem_t* elem = mixer_elem_list[ devnum ];
	return elem;
 */
}

bool Mixer_ALSA::prepareUpdateFromHW()
{
    if ( !m_fds || !m_isOpen )
	return false;

    //kdDebug(67100) << "Mixer_ALSA::prepareUpdate() 1\n";

    // Poll on fds with 10ms timeout
    // Hint: alsamixer has an infinite timeout, but we cannot do this because we would block
    // the X11 event handling (TQt event loop) with this.
    //kdDebug(67100) << "Mixer_ALSA::prepareUpdate() 3\n";
    int finished = poll(m_fds, m_count, 10);
    //kdDebug(67100) << "Mixer_ALSA::prepareUpdate() 4\n";

    bool updated = false;
    if (finished > 0) {
        //kdDebug(67100) << "Mixer_ALSA::prepareUpdate() 5\n";

        unsigned short revents;

        if (snd_mixer_poll_descriptors_revents(_handle, m_fds, m_count, &revents) >= 0) {
            //kdDebug(67100) << "Mixer_ALSA::prepareUpdate() 6\n";

	    if (revents & POLLNVAL) {
		/* Bug 127294 shows, that we receieve POLLNVAL when the user
		 unplugs an USB soundcard. Lets close the card. */
		kdDebug(67100) << "Mixer_ALSA::poll() , Error: poll() returns POLLNVAL\n";
		close();  // Card was unplugged (unplug, driver unloaded)
		return false;
	    }
	    if (revents & POLLERR) {
		kdDebug(67100) << "Mixer_ALSA::poll() , Error: poll() returns POLLERR\n";
		return false;
	    }
	    if (revents & POLLIN) {
                //kdDebug(67100) << "Mixer_ALSA::prepareUpdate() 7\n";

		snd_mixer_handle_events(_handle);
                updated = true;
	    }
	}

    }
    //kdDebug(67100) << "Mixer_ALSA::prepareUpdate() " << updated << endl;;
    return updated;
}

bool
Mixer_ALSA::isRecsrcHW( int devnum )
{
	bool isCurrentlyRecSrc = false;
	snd_mixer_elem_t *elem = getMixerElem( devnum );

	if ( !elem ) {
		return false;
	}

	if ( snd_mixer_selem_has_capture_switch( elem ) ) {
		// Has a on-off switch
		// Yes, this element can be record source. But the user can switch it off, so lets see if it is switched on.
		int swLeft;
		int ret = snd_mixer_selem_get_capture_switch( elem, SND_MIXER_SCHN_FRONT_LEFT, &swLeft );
                if ( ret != 0 ) {
                        kdDebug(67100) << "snd_mixer_selem_get_capture_switch() failed 1\n";
                }

		if (snd_mixer_selem_has_capture_switch_joined( elem ) ) {
			isCurrentlyRecSrc = (swLeft != 0);
#ifdef ALSA_SWITCH_DEBUG
			kdDebug(67100) << "Mixer_ALSA::isRecsrcHW() has_switch joined: #" << devnum << " >>> " << swLeft << " : " << isCurrentlyRecSrc << endl;
#endif
		}
		else {
			int swRight;
			snd_mixer_selem_get_capture_switch( elem, SND_MIXER_SCHN_FRONT_RIGHT, &swRight );
			isCurrentlyRecSrc = ( (swLeft != 0) || (swRight != 0) );
#ifdef ALSA_SWITCH_DEBUG
			kdDebug(67100) << "Mixer_ALSA::isRecsrcHW() has_switch non-joined, state " << isCurrentlyRecSrc << endl;
#endif
		}
	}
	else {
		// Has no on-off switch
		if ( snd_mixer_selem_has_capture_volume( elem ) ) {
			// Has a volume, but has no OnOffSwitch => We assume that this is a fixed record source (always on). (esken)
			isCurrentlyRecSrc = true;
#ifdef ALSA_SWITCH_DEBUG
			kdDebug(67100) << "Mixer_ALSA::isRecsrcHW() has_no_switch, state " << isCurrentlyRecSrc << endl;
#endif
		}
	}

	return isCurrentlyRecSrc;
}

bool
Mixer_ALSA::setRecsrcHW( int devnum, bool on )
{
	int sw = 0;
	if (on)
		sw = !sw;

	snd_mixer_elem_t *elem = getMixerElem( devnum );
	if ( !elem )
	{
		return 0;
	}

	if (snd_mixer_selem_has_capture_switch_joined( elem ) )
	{
		int before, after;
		int ret = snd_mixer_selem_get_capture_switch( elem, SND_MIXER_SCHN_FRONT_LEFT, &before );
		if ( ret != 0 ) {
			kdDebug(67100) << "snd_mixer_selem_get_capture_switch() failed 1\n";
		}

		ret = snd_mixer_selem_set_capture_switch_all( elem, sw );
                if ( ret != 0 ) {
                        kdDebug(67100) << "snd_mixer_selem_set_capture_switch_all() failed 2: errno=" << ret << "\n";
                }
		ret = snd_mixer_selem_get_capture_switch( elem, SND_MIXER_SCHN_FRONT_LEFT, &after );
                if ( ret != 0 ) {
                        kdDebug(67100) << "snd_mixer_selem_get_capture_switch() failed 3: errno=" << ret << "\n";
                }

#ifdef ALSA_SWITCH_DEBUG
		kdDebug(67100) << "Mixer_ALSA::setRecsrcHW(" << devnum <<  "," << on << ")joined. Before=" << before << " Set=" << sw << " After=" << after <<"\n";
#endif

	}
	else
	{
#ifdef ALSA_SWITCH_DEBUG
			kdDebug(67100) << "Mixer_ALSA::setRecsrcHW LEFT\n";
#endif
			snd_mixer_selem_set_capture_switch( elem, SND_MIXER_SCHN_FRONT_LEFT, sw );
#ifdef ALSA_SWITCH_DEBUG
			kdDebug(67100) << "Mixer_ALSA::setRecsrcHW RIGHT\n";
#endif
			snd_mixer_selem_set_capture_switch(elem, SND_MIXER_SCHN_FRONT_RIGHT, sw);
	}

#ifdef ALSA_SWITCH_DEBUG
	kdDebug(67100) << "EXIT Mixer_ALSA::setRecsrcHW(" << devnum << "," << on <<  ")\n";
#endif
	return false; // we should always return false, so that other devnum's get updated
	// The ALSA polling has been implemented some time ago. So it should be safe to
	// return "true" here.
	// The other devnum's Rec-Sources won't get update by KMix code, but ALSA will send
	// us an event, if neccesary. But OTOH it is possibly better not to trust alsalib fully,
        // because the old code is working also well (just takes more processing time).
	// return true;
}

/**
 * Sets the ID of the currently selected Enum entry.
 * Warning: ALSA supports to have different enums selected on each channel
 *          of the SAME snd_mixer_elem_t. KMix does NOT support that and
 *          always sets both channels (0 and 1).
 */
void Mixer_ALSA::setEnumIdHW(int mixerIdx, unsigned int idx) {
	//kdDebug(67100) << "Mixer_ALSA::setEnumIdHW(" << mixerIdx << ", idx=" << idx << ") 1\n";
        snd_mixer_elem_t *elem = getMixerElem( mixerIdx );
        if ( elem==0 || ( !snd_mixer_selem_is_enumerated(elem)) )
        {
                return;
        }

	//kdDebug(67100) << "Mixer_ALSA::setEnumIdHW(" << mixerIdx << ", idx=" << idx << ") 2\n";
	int ret = snd_mixer_selem_set_enum_item(elem,SND_MIXER_SCHN_FRONT_LEFT,idx);
        if (ret < 0) {
           kdError(67100) << "Mixer_ALSA::setEnumIdHW(" << mixerIdx << "), errno=" << ret << "\n";
        }
	snd_mixer_selem_set_enum_item(elem,SND_MIXER_SCHN_FRONT_RIGHT,idx);
	// we don't care about possible error codes on channel 1
        return;
}

/**
 * Return the ID of the currently selected Enum entry.
 * Warning: ALSA supports to have different enums selected on each channel
 *          of the SAME snd_mixer_elem_t. KMix does NOT support that and
 *          always shows the value of the first channel.
 */
unsigned int Mixer_ALSA::enumIdHW(int mixerIdx) {
	snd_mixer_elem_t *elem = getMixerElem( mixerIdx );
        if ( elem==0 || ( !snd_mixer_selem_is_enumerated(elem)) )
        {
                return 0;
        }

	unsigned int idx = 0;
	int ret = snd_mixer_selem_get_enum_item(elem,SND_MIXER_SCHN_FRONT_LEFT,&idx);
	//kdDebug(67100) << "Mixer_ALSA::enumIdHW(" << mixerIdx << ") idx=" << idx << "\n";
	if (ret < 0) {
	   idx = 0;
	   kdError(67100) << "Mixer_ALSA::enumIdHW(" << mixerIdx << "), errno=" << ret << "\n";
	}
	return idx;
}


int
Mixer_ALSA::readVolumeFromHW( int mixerIdx, Volume &volume )
{
	int elem_sw;
	long left, right;

	snd_mixer_elem_t *elem = getMixerElem( mixerIdx );
	if ( !elem )
	{
		return 0;
	}


	// *** READ PLAYBACK VOLUMES *************
	if ( snd_mixer_selem_has_playback_volume( elem ) && !volume.isCapture() )
	{
		int ret = snd_mixer_selem_get_playback_volume( elem, SND_MIXER_SCHN_FRONT_LEFT, &left );
                if ( ret != 0 ) kdDebug(67100) << "readVolumeFromHW(" << mixerIdx << ") [has_playback_volume,R] failed, errno=" << ret << endl;
		if ( snd_mixer_selem_is_playback_mono ( elem )) {
                    volume.setVolume( Volume::LEFT , left );
                    volume.setVolume( Volume::RIGHT, left );
                }
                else {
                    int ret = snd_mixer_selem_get_playback_volume( elem, SND_MIXER_SCHN_FRONT_RIGHT, &right );
                    if ( ret != 0 ) kdDebug(67100) << "readVolumeFromHW(" << mixerIdx << ") [has_playback_volume,R] failed, errno=" << ret << endl;
                    volume.setVolume( Volume::LEFT , left );
                    volume.setVolume( Volume::RIGHT, right );
                }
	}
	else
	if ( snd_mixer_selem_has_capture_volume ( elem ) && volume.isCapture() )
	{
            int ret = snd_mixer_selem_get_capture_volume ( elem, SND_MIXER_SCHN_FRONT_LEFT, &left );
            if ( ret != 0 ) kdDebug(67100) << "readVolumeFromHW(" << mixerIdx << ") [get_capture_volume,L] failed, errno=" << ret << endl;
	    if ( snd_mixer_selem_is_capture_mono  ( elem )) {
		volume.setVolume( Volume::LEFT , left );
		volume.setVolume( Volume::RIGHT, left );
	    }
	    else
	    {
		int ret = snd_mixer_selem_get_capture_volume( elem, SND_MIXER_SCHN_FRONT_RIGHT, &right );
		if ( ret != 0 ) kdDebug(67100) << "readVolumeFromHW(" << mixerIdx << ") [has_capture_volume,R] failed, errno=" << ret << endl;
		volume.setVolume( Volume::LEFT , left );
		volume.setVolume( Volume::RIGHT, right );
	    }
	}

        //kdDebug() << "snd_mixer_selem_has_playback_volume " << mixerIdx << " " << snd_mixer_selem_has_playback_switch( elem ) << endl;
	if ( snd_mixer_selem_has_playback_switch( elem ) )
	{
	    snd_mixer_selem_get_playback_switch( elem, SND_MIXER_SCHN_FRONT_LEFT, &elem_sw );
            volume.setMuted( elem_sw == 0 );
	}

	return 0;
}

int
Mixer_ALSA::writeVolumeToHW( int devnum, Volume& volume )
{
	int left, right;

	snd_mixer_elem_t *elem = getMixerElem( devnum );
	if ( !elem )
	{
		return 0;
	}

	// --- VOLUME  - WE HAVE JUST ONE TYPE OF VOLUME A TIME,
	// CAPTURE OR PLAYBACK, SO IT"S JUST USE VOLUME ------------
	left = volume[ Volume::LEFT ];
	right = volume[ Volume::RIGHT ];

	if (snd_mixer_selem_has_playback_volume( elem ) && !volume.isCapture() ) {
		snd_mixer_selem_set_playback_volume ( elem, SND_MIXER_SCHN_FRONT_LEFT, left );
		if ( ! snd_mixer_selem_is_playback_mono ( elem ) )
			snd_mixer_selem_set_playback_volume ( elem, SND_MIXER_SCHN_FRONT_RIGHT, right );
	}
	else if ( snd_mixer_selem_has_capture_volume( elem ) && volume.isCapture() ) {
		snd_mixer_selem_set_capture_volume ( elem, SND_MIXER_SCHN_FRONT_LEFT, left );
		if ( ! snd_mixer_selem_is_playback_mono ( elem ) )
			snd_mixer_selem_set_capture_volume ( elem, SND_MIXER_SCHN_FRONT_RIGHT, right );
	}

	if ( snd_mixer_selem_has_playback_switch( elem ) )
	{
		int sw = 0;
		if (! volume.isMuted())
			sw = !sw;
		snd_mixer_selem_set_playback_switch_all(elem, sw);
	}

	return 0;
}

TQString
Mixer_ALSA::errorText( int mixer_error )
{
	TQString l_s_errmsg;
	switch ( mixer_error )
	{
		case Mixer::ERR_PERM:
			l_s_errmsg = i18n("You do not have permission to access the alsa mixer device.\n" \
					"Please verify if all alsa devices are properly created.");
      break;
		case Mixer::ERR_OPEN:
			l_s_errmsg = i18n("Alsa mixer cannot be found.\n" \
					"Please check that the soundcard is installed and the\n" \
					"soundcard driver is loaded.\n" );
			break;
		default:
			l_s_errmsg = Mixer_Backend::errorText( mixer_error );
	}
	return l_s_errmsg;
}


TQString
ALSA_getDriverName()
{
	return "ALSA";
}


ALSA_DevIterator::ALSA_DevIterator()
{
	N = -1;
	NMax = 31;
}

void ALSA_DevIterator::next()
{
#if 0
	int rc = snd_card_next(&N);
	if (rc || (N == -1)) N = NMax + 1;
#else
	if ((snd_card_next(&N) != 0) || (N == -1)) N = NMax + 1;
#endif
}

DevIterator* ALSA_getDevIterator()
{
	return new ALSA_DevIterator();
}