summaryrefslogtreecommitdiffstats
path: root/plugins/alsa/alsa-api-streams.c
blob: 21e36eb76ffad6275b723dae59dce94510aa9a9e (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
/*
 * Copyright (C) 2018 "IoT.bzh"
 * Author Fulup Ar Foll <fulup@iot.bzh>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#define _GNU_SOURCE  // needed for vasprintf

#include "alsa-softmixer.h"
#include <avirt/avirt.h>

#include <string.h>
#include <stdbool.h>
#include <dlfcn.h>

// Set stream volume control in %
#define VOL_CONTROL_MAX  100
#define VOL_CONTROL_MIN  0
#define VOL_CONTROL_STEP 1

// Fulup need to be cleanup with new controller version
extern Lua2cWrapperT Lua2cWrap;

typedef struct {
    AlsaStreamAudioT *stream;
    SoftMixerT *mixer;
    AlsaVolRampT *ramp;
    AlsaSndCtlT *sndcard;
    snd_pcm_t *pcm;
} apiHandleT;

STATIC void StreamApiVerbCB(afb_req_t request) {
    apiHandleT *handle = (apiHandleT*) afb_req_get_vcbdata(request);
    int error, verbose = 0, doClose = 0, doToggle = 0, doMute = -1, doInfo = 0;
    long mute, volume, prevvol;
    json_object *volumeJ = NULL, *rampJ = NULL, *argsJ = afb_req_json(request);
    json_object *responseJ = NULL;
    SoftMixerT *mixer = handle->mixer;
    AlsaSndCtlT *sndcard = handle->sndcard;
    assert(mixer && sndcard);

    error = wrap_json_unpack(argsJ, "{s?b s?b,s?b,s?b,s?b,s?o,s?o !}"
            , "close", &doClose
            , "mute", &doMute
            , "toggle", &doToggle
            , "info", &doInfo
            , "verbose", &verbose
            , "volume", &volumeJ
            , "ramp", &rampJ
            );

    if (error) {
        afb_req_fail_f(request, "syntax-error", "Missing 'close|mute|volume|verbose' args=%s", json_object_get_string(argsJ));
        goto OnErrorExit;
    }

    if (verbose) responseJ = json_object_new_object();

    if (doClose) {
        afb_req_fail_f(request, "internal-error", "(Fulup) Close action still to be done mixer=%s stream=%s", mixer->uid, handle->stream->uid);
        goto OnErrorExit;
    }

    if (doToggle) {
        error += AlsaCtlNumidGetLong(mixer, sndcard, handle->stream->mute, &mute);
        error += AlsaCtlNumidSetLong(mixer, sndcard, handle->stream->mute, !mute);
        if (error) {
            afb_req_fail_f(request, "invalid-numid", "Fail to set/get pause numid=%d", handle->stream->mute);
            goto OnErrorExit;
        }

        if (verbose) {
            json_object_object_add(responseJ, "mute", json_object_new_boolean(!mute));
        }
    }

    if (doMute != -1) {
        error = AlsaCtlNumidSetLong(mixer, handle->sndcard, handle->stream->mute, doMute);
        if (error) {
            afb_req_fail_f(request, "StreamApiVerbCB", "Fail to set stream volume numid=%d value=%d", handle->stream->volume, !doMute);
            goto OnErrorExit;
        }

        if (verbose) {
            error += AlsaCtlNumidGetLong(mixer, handle->sndcard, handle->stream->mute, &mute);
            json_object_object_add(responseJ, "mute", json_object_new_boolean((json_bool) mute));
        }
    }

    if (volumeJ) {
        long voltoset, newvol;
        const char*volString;

        error = AlsaCtlNumidGetLong(mixer, handle->sndcard, handle->stream->volume, &prevvol);
        if (error) {
            afb_req_fail_f(request, "invalid-numid", "Fail to get volume numid=%d value=%ld", handle->stream->volume, volume);
            goto OnErrorExit;
        }

        switch (json_object_get_type(volumeJ)) {
            case json_type_string:
                volString = json_object_get_string(volumeJ);
                switch (volString[0]) {
                    case '+':
                        sscanf(&volString[1], "%ld", &voltoset);
                        voltoset = prevvol + voltoset;
                        break;

                    case '-':
                        sscanf(&volString[1], "%ld", &voltoset);
                        voltoset = prevvol - voltoset;
                        break;
                    default:
                        error = sscanf(&volString[0], "%ld", &voltoset);
                        if (error != 1) {
                            afb_req_fail_f(request, "not-integer", "relative volume should start by '+|-' value=%s", json_object_get_string(volumeJ));
                            goto OnErrorExit;
                        }
                }
                break;
            case json_type_int:
                voltoset = json_object_get_int(volumeJ);
                break;
            default:
                afb_req_fail_f(request, "not-integer", "volume should be string or integer value=%s", json_object_get_string(volumeJ));
                goto OnErrorExit;

        }

        error = AlsaCtlNumidSetLong(mixer, handle->sndcard, handle->stream->volume, voltoset);
        if (error) {
            afb_req_fail_f(request, "StreamApiVerbCB", "Fail to set stream volume numid=%d value=%ld", handle->stream->volume, voltoset);
            goto OnErrorExit;
        }

        error = AlsaCtlNumidGetLong(mixer, handle->sndcard, handle->stream->volume, &newvol);
        if (error) {
            afb_req_fail_f(request, "invalid-numid", "Fail to get volume numid=%d value=%ld", handle->stream->volume, volume);
            goto OnErrorExit;
        }

        if (verbose) {
            json_object_object_add(responseJ, "volnew", json_object_new_int((int) newvol));
            json_object_object_add(responseJ, "volold", json_object_new_int((int) prevvol));
        }
    }

    if (rampJ) {
        if (verbose) {
            error = AlsaCtlNumidGetLong(mixer, handle->sndcard, handle->stream->volume, &prevvol);
            json_object_object_add(responseJ, "volold", json_object_new_int((int) prevvol));
        }

        error += AlsaVolRampApply(mixer, handle->sndcard, handle->stream, rampJ);
        if (error) {
            afb_req_fail_f(request, "StreamApiVerbCB", "Fail to set stream volram numid=%d value=%s", handle->stream->volume, json_object_get_string(rampJ));
            goto OnErrorExit;
        }
    }


    if (doInfo) {
        json_object_put(responseJ); // free default response.
        error += AlsaCtlNumidGetLong(mixer, handle->sndcard, handle->stream->volume, &volume);
        error += AlsaCtlNumidGetLong(mixer, handle->sndcard, handle->stream->mute, &mute);
        if (error) {
            afb_req_fail_f(request, "StreamApiVerbCB", "Fail to get stream numids volume=%ld mute=%ld", volume, mute);
            goto OnErrorExit;
        }
        wrap_json_pack(&responseJ, "{si,sb}", "volume", volume, "mute", !mute);
    }

    afb_req_success(request, responseJ, NULL);
    return;

OnErrorExit:
    return;
}

static void paramsOverride(SoftMixerT *mixer, AlsaStreamAudioT * destStream, const AlsaPcmHwInfoT * src) {

	if (!destStream->params || !src)
		return;

	AlsaPcmHwInfoT * dest = destStream->params;

	/* The stream always has the same number of channels as the source */
	dest->channels = src->channels;

	if (dest->format != src->format) {
		AFB_API_NOTICE(mixer->api, "Stream %s overrides format to %d", destStream->uid, src->format);
		dest->format  = src->format;
		strncpy(dest->formatString, src->formatString, SND_FORMAT_STRING_LEN );
	}

	if (dest->access != src->access) {
		AFB_API_NOTICE(mixer->api, "Stream %s overrides access to %d", destStream->uid, src->access);
		dest->access  = src->access;
	}

	if (dest->rate != src->rate) {
		AFB_API_NOTICE(mixer->api, "Stream %s overrides rate to %d", destStream->uid, src->rate);
		dest->rate = src->rate;
	}

}

STATIC int CreateOneStream(SoftMixerT *mixer, const char * uid, AlsaStreamAudioT * stream) {
    int error;
    long value;
    AlsaSndLoopT *loop = NULL;
    AlsaPcmCtlT *streamPcm;
    AlsaSndCtlT *captureCard;
    AlsaDevInfoT *captureDev = alloca(sizeof (AlsaDevInfoT));
    AlsaLoopSubdevT *loopDev;
	AlsaSndZoneT *zone = NULL;
    char *volSlaveId = NULL;
    char *playbackName = NULL;
    char *runName = NULL;
    char *volName = NULL;
    int pauseNumid = 0;
    int volNumid = 0;
    int device, subdev;

	AFB_API_DEBUG(mixer->api,
				"NEW STREAM stream %s %s, source %s, sink %s, mute %d",
				uid, stream->uid, stream->source, stream->sink, stream->mute);

    loopDev = ApiLoopFindSubdev(mixer, stream->uid, stream->source, &loop);
    if (loopDev) {
        if (loop->avirt) {
            device = loopDev->index;
            subdev = 0;
        } else { // loop->avirt == false
            device = loop->capture;
            subdev = loopDev->index;
        }

        // create a valid PCM reference and try to open it.
        captureDev->devpath = NULL;
        captureDev->cardid = NULL;
        captureDev->cardidx = loop->sndcard->cid.cardidx;
        captureDev->device = device;
        captureDev->subdev = subdev;
        captureDev->pcmplug_params = NULL;
        captureCard = loop->sndcard;

		AFB_API_DEBUG(mixer->api,
                    "%s: found loopdev %d,%d",
                    __func__, loop->capture, loopDev->index);

    } else {
		// if capture UID is not present in loop search on known sources
		AFB_API_DEBUG(mixer->api,"%s: %s not found in loop, look in sources", __func__, stream->source);

        AlsaSndCtlT *sourceDev = ApiSourceFindSubdev(mixer, stream->source);
        if (sourceDev) {
            captureDev->devpath = NULL;
            captureDev->cardid = NULL;
            captureDev->cardidx = sourceDev->cid.cardidx;
            captureDev->device = sourceDev->cid.device;
            captureDev->subdev = sourceDev->cid.subdev;
            captureDev->pcmplug_params = sourceDev->cid.pcmplug_params;
            captureCard = sourceDev;
			AFB_API_DEBUG(mixer->api, "%s found capture for %s (plug %s, card %s)",
						 __func__, uid, captureDev->pcmplug_params, sourceDev->cid.cardid);
        } else {
            AFB_API_ERROR(mixer->api,
                         "%s: mixer=%s stream=%s: %s not found in loops/sources",
                         __func__, mixer->uid, stream->uid, stream->source);
            goto OnErrorExit;
        }
    }

	stream->optional = captureCard->optional;

	if (!captureCard->ctl && captureCard->optional) {
		stream->noHwDetected = true;
		AFB_API_INFO(mixer->api,"%s: no detected capture device", __func__);
		goto done;
	}

    // check PCM is valid and get its full name
	AlsaPcmCtlT *capturePcm = AlsaByPathOpenPcmCtl(mixer, captureDev, SND_PCM_STREAM_CAPTURE);
	if (!capturePcm) {
		AFB_API_ERROR(mixer->api,"%s: Unable to open the capture PCM !", __func__);
		goto OnErrorExit;
	}

	paramsOverride(mixer, stream, captureCard->params);

	capturePcm->closeAtDeletion = true;
    capturePcm->mute = stream->mute;

	AFB_API_DEBUG(mixer->api,"%s: Capture PCM opened !", __func__);

    // Registry capturePcm PCM for active/pause event
    if (loopDev && loopDev->numid) {
		AFB_API_DEBUG(mixer->api, "%s: REGISTER active/pause", __func__);
        error = AlsaCtlRegister(mixer, captureCard, capturePcm, FONTEND_NUMID_RUN, loopDev->numid);
		if (error)
			goto OnErrorExit;
    }

	if (stream->sink) {
        // if zones exist then retrieve zone pcmid and channel count
        zone = ApiZoneGetByUid(mixer, stream->sink);
        if (!zone) {
            AFB_API_ERROR(mixer->api,
                         "%s: mixer=%s stream=%s fail to find sink zone='%s'",
                         __func__, mixer->uid, stream->uid, stream->sink);
            goto OnErrorExit;
        }

        // route PCM should have been create during zones attach phase.
		if (asprintf(&volSlaveId, "route-%s", zone->uid) == -1) {
			SOFTMIXER_NOMEM(mixer->api);
            goto OnErrorExit;
		}

	} else if (stream->playback) {
		AlsaSndPcmT *playback = ApiSinkGetByUid(mixer, stream->playback);
        if (!playback) {
            AFB_API_ERROR(mixer->api,
                         "%s: mixer=%s stream=%s fail to find sink playback='%s'",
						 __func__, mixer->uid, stream->uid, stream->sink);
            goto OnErrorExit;
        }

		/* there is no dmix on pcmplugs */
		if (playback->isPcmPlug) {
			if (asprintf(&volSlaveId, "%s", playback->sndcard->cid.pcmplug_params) == -1) {
				SOFTMIXER_NOMEM(mixer->api);
				goto OnErrorExit;
			}
		}
		else {
			if (asprintf(&volSlaveId, "dmix-%s", playback->uid) == -1) {
				SOFTMIXER_NOMEM(mixer->api);
				goto OnErrorExit;
			}
		}

		AFB_API_ERROR(mixer->api, "%s: Allocate a fake ZONE", __func__);

        // create a fake zone for rate converter selection
        zone=alloca(sizeof(AlsaSndZoneT));
        zone->uid = playback->uid;

        ApiPcmParamsShow(mixer,"PLAYBACK to FAKE ZONE", playback->sndcard->params);

        zone->params = ApiPcmParamsDup(mixer, playback->sndcard->params);
		zone->ccount = playback->nbChannels;

    }

    // create mute control and Registry it as pause/resume ctl)
	if (asprintf(&runName, "pause-%s", stream->uid) == -1) {
		SOFTMIXER_NOMEM(mixer->api);
        goto OnErrorExit;
	}

	AFB_API_DEBUG(mixer->api,"%s: create mute control...", __func__);

    pauseNumid = AlsaCtlCreateControl(mixer, captureCard, runName, 1, 0, 1, 1, stream->mute);
    if (pauseNumid <= 0) {
        AFB_API_ERROR(mixer->api, "%s: Failed to create pause control", __func__);
        goto OnErrorExit;
    }

	AFB_API_DEBUG(mixer->api,"%s: register mute control...", __func__);

    // Registry stop/play as a pause/resume control
    error = AlsaCtlRegister(mixer, captureCard, capturePcm, FONTEND_NUMID_PAUSE, pauseNumid);
    if (error) {
        AFB_API_ERROR(mixer->api, "%s: Failed to register pause control", __func__);
        goto OnErrorExit;
    }

	if (asprintf(&volName, "vol-%s", stream->uid) == -1) {
		SOFTMIXER_NOMEM(mixer->api);
        goto OnErrorExit;
	}

	AFB_API_DEBUG(mixer->api,"%s: create softvol", __func__);

    // create stream and delay pcm opening until vol control is created
    streamPcm = AlsaCreateSoftvol(mixer, stream, volSlaveId, captureCard, volName, VOL_CONTROL_MAX, 0);
    if (!streamPcm) {
        AFB_API_ERROR(mixer->api, "%s failed to create soft volume PCM", __func__);
        goto OnErrorExit;
    }

	AFB_API_DEBUG(mixer->api,"%s: create softvol control", __func__);

	ApiPcmParamsShow(mixer, "Stream ", stream->params);
	ApiPcmParamsShow(mixer, "Zone", zone->params);

    // create volume control before softvol pcm is opened
    volNumid = AlsaCtlCreateControl(mixer,
                                        captureCard,
                                        volName,
                                        stream->params->channels,
                                        VOL_CONTROL_MIN,
                                        VOL_CONTROL_MAX,
                                        VOL_CONTROL_STEP,
                                        stream->volume);
    if (volNumid <= 0) {
        AFB_API_ERROR(mixer->api, "%s failed add volume control on capture card", __func__);
        goto OnErrorExit;
    }

    if ((zone->params->rate   != stream->params->rate) ||
        (zone->params->format != stream->params->format)) {
        AFB_API_NOTICE(mixer->api,
					  "%s: Instantiate a RATE CONVERTER (stream [rate %d,%s(%d),%d channels], zone [rate %d,%s(%d), %d channels])",
                      __func__,
                      stream->params->rate,
                      stream->params->formatString,
                      stream->params->format,
					  stream->params->channels,
                      zone->params->rate,
                      zone->params->formatString,
					  zone->params->format,
					  zone->params->channels);

        char *rateName;
		if (asprintf(&rateName, "rate-%s", stream->uid) == -1) {
			SOFTMIXER_NOMEM(mixer->api);
            goto OnErrorExit;
		}
		streamPcm = AlsaCreateRate(mixer, stream, rateName, streamPcm, zone->params, 0);
        if (!streamPcm) {
            AFB_API_ERROR(mixer->api, "%s: fail to create rate converter", __func__);
            goto OnErrorExit;
        }
        playbackName = rateName;
    } else {
        AFB_API_NOTICE(mixer->api, "%s: no need for a converter", __func__);
        playbackName = (char*) streamPcm->cid.cardid;
    }

    streamPcm->isPcmPlug = zone->isPcmPlug;
	streamPcm->quirks    = zone->quirks;

	AFB_API_DEBUG(mixer->api, "%s: Opening PCM PLAYBACK name %s (quirks=0x%x)", __func__, playbackName, streamPcm->quirks);

    // everything is now ready to open playback pcm in BLOCKING mode this time
    error = snd_pcm_open(&streamPcm->handle, playbackName, SND_PCM_STREAM_PLAYBACK, 0 /* will block*/ );
    if (error) {
        AFB_API_ERROR(mixer->api,
                     "%s: mixer=%s stream=%s fail to open playback PCM=%s; error=%s",
                     __func__, mixer->uid, stream->uid, streamPcm->cid.cardid, snd_strerror(error));
        goto OnErrorExit;
    }

	streamPcm->closeAtDeletion = true;

    // start stream pcm copy (at this both capturePcm & sink pcm should be open, we use output params to configure both in+outPCM)
	error = AlsaPcmCopyStart(mixer, stream, capturePcm, streamPcm, stream->params);
    if (error) {
        AFB_API_ERROR(mixer->api, "%s: Failed to launch copy", __func__);
        goto OnErrorExit;
    }
	AFB_API_DEBUG(mixer->api, "%s: register VOL ctrl", __func__);
    error = AlsaCtlRegister(mixer, captureCard, capturePcm, FONTEND_NUMID_IGNORE, volNumid);
    if (error) {
        AFB_API_ERROR(mixer->api, "%s: register control on capture", __func__);
        goto OnErrorExit;
    }

    // when using loopdev check if subdev is active or not to prevent thread from reading empty packet
    if (loopDev && loopDev->numid) {
        // retrieve active/pause control and set PCM status accordingly 
        error = AlsaCtlNumidGetLong(mixer, captureCard, loopDev->numid, &value);
		if (error)
			goto OnErrorExit;

        // toggle pause/resume (should be done after pcm_start)
        if ((error = snd_pcm_pause(capturePcm->handle, !value)) < 0) {
            AFB_API_WARNING(mixer->api, "CreateOneStream: mixer=%s [capturePcm=%s] fail to pause error=%s", mixer->uid, captureDev->cardid, snd_strerror(error));
        }
    }

    if (loop) {
        int device = (loop->avirt) ? captureDev->device
                                   : loop->playback;
        if (asprintf((char**) &stream->source, "hw:%d,%d,%d", captureDev->cardidx, device, capturePcm->cid.subdev) == -1)
            goto OnErrorExit;
    } else {
		if (asprintf((char**) &stream->source, "hw:%d,%d,%d", captureDev->cardidx, captureDev->device, captureDev->subdev) == -1) {
			SOFTMIXER_NOMEM(mixer->api);
            goto OnErrorExit;
		}
    }

    // create a dedicated verb for this stream 
    apiHandleT *apiHandle = calloc(1, sizeof (apiHandleT));
	if (apiHandle == NULL) {
		SOFTMIXER_NOMEM(mixer->api);
		goto OnErrorExit;
	}

    apiHandle->mixer = mixer;
    apiHandle->stream = stream;
    apiHandle->sndcard = captureCard;
    apiHandle->pcm = capturePcm->handle;

	// keep a reference for future cleanup
	stream->verbApiHandle = apiHandle;

    // replace stream volume/mute values with corresponding ctl control
    stream->volume = volNumid;
    stream->mute = pauseNumid;

    error = afb_api_add_verb(mixer->api, stream->verb, stream->info, StreamApiVerbCB, apiHandle, NULL, 0, 0);
    if (error) {
        AFB_API_ERROR(mixer->api,
                     "%s mixer=%s fail to Register API verb stream=%s",
                     __func__, mixer->uid, stream->uid);
        goto OnErrorExit;
    }

    // Debug Alsa Config 
    //AlsaDumpElemConfig (source, "\n\nAlsa_Config\n------------\n", "pcm");
    //AlsaDumpPcmInfo(source, "\n\nPcm_config\n-----------\n", streamPcm->handle);

    AFB_API_NOTICE(mixer->api,
				  "%s: mixer=%s stream=%s CREATED",
                  __func__, mixer->uid, stream->uid);
done:
    return 0;

OnErrorExit:
	free(volSlaveId);
	free(runName);
	free(volName);
    return -1;
}

STATIC AlsaStreamAudioT * AttachOneStream(SoftMixerT *mixer, const char *uid, const char *prefix, json_object * streamJ) {
    int error;
    json_object *paramsJ = NULL;

	AlsaStreamAudioT *stream = calloc(1, sizeof (AlsaStreamAudioT));
	if (stream == NULL) {
		SOFTMIXER_NOMEM(mixer->api);
		goto OnErrorExit;
	}

    // Make sure default runs
    stream->volume = ALSA_DEFAULT_PCM_VOLUME;
    stream->mute = 0;
    stream->info = NULL;
	stream->delayms = SMIXER_DEFLT_DELAYMS;

	error = wrap_json_unpack(streamJ, "{ss,s?s,s?s,s?s,s?s,s?s,s?i,s?b,s?o,s?s,s?i !}"
            , "uid", &stream->uid
            , "verb", &stream->verb
            , "info", &stream->info
            , "zone", &stream->sink
			, "playback", &stream->playback
            , "source", &stream->source
            , "volume", &stream->volume
            , "mute", &stream->mute
            , "params", &paramsJ
            , "ramp", &stream->ramp
			, "delayms", &stream->delayms
            );

    if (error) {
		AFB_API_ERROR(mixer->api,
                       "%s: hal=%s missing 'uid|[info]|zone|source||[volume]|[mute]|[params]' error=%s stream=%s",
                       __func__, uid, wrap_json_get_error_string(error), json_object_get_string(streamJ));
        goto OnErrorExit;
    }

	if (!stream->sink && !stream->playback) {
		AFB_API_ERROR(mixer->api, "%s: A stream must have a zone or a playback", __func__);
		goto OnErrorExit;
	}

	if (stream->sink && stream->playback) {
		AFB_API_ERROR(mixer->api, "%s: both a playback and a zone cannot be defined at the same time", __func__);
		goto OnErrorExit;
	}

    stream->params = ApiPcmSetParams(mixer, stream->uid, paramsJ);
    if (!stream->params) {
        AFB_API_ERROR(mixer->api,
                     "%s: hal=%s stream=%s invalid params=%s",
                     __func__, uid, stream->uid, json_object_get_string(paramsJ));
        goto OnErrorExit;
    }

    // make sure remain valid even when json object is removed
    stream->uid = strdup(stream->uid);
	if (stream->uid == NULL) {
		SOFTMIXER_NOMEM(mixer->api);
		goto OnErrorExit;
	}
	if (stream->sink) {
		stream->sink = strdup(stream->sink);
		if (stream->sink == NULL) {
			SOFTMIXER_NOMEM(mixer->api);
			goto OnErrorExit;
		}
	}
	if (stream->source) {
		stream->source = strdup(stream->source);
		if (stream->source == NULL) {
			SOFTMIXER_NOMEM(mixer->api);
			goto OnErrorExit;
		}
	}
	if (stream->playback) {
		stream->playback = strdup(stream->playback);
		if (stream->playback == NULL) {
			SOFTMIXER_NOMEM(mixer->api);
			goto OnErrorExit;
		}
	}

    // Prefix verb with uid|prefix
    if (prefix) {
        if (stream->verb) {
			if (asprintf((char**) &stream->verb, "%s#%s", prefix, stream->verb) == -1) {
				SOFTMIXER_NOMEM(mixer->api);
                goto OnErrorExit;
			}
        }
        else {
			if (asprintf((char**) &stream->verb, "%s#%s", prefix, stream->uid) == -1) {
				SOFTMIXER_NOMEM(mixer->api);
                goto OnErrorExit;
			}
        }
    } else {
		if (!stream->verb) {
            stream->verb = strdup(stream->uid);
			if (stream->verb == NULL) {
				SOFTMIXER_NOMEM(mixer->api);
				goto OnErrorExit;
			}
		}
    }

    // implement stream PCM with corresponding thread and controls
    error = CreateOneStream(mixer, uid, stream);
    if (error) {
        AFB_API_ERROR(mixer->api, "%s: failed to create stream", __func__);
        goto OnErrorExit;
    }
    return stream;

OnErrorExit:
    free(stream);
    AFB_API_ERROR(mixer->api, "%s fail", __func__);
    return NULL;
}

static void streamDestroy(SoftMixerT * mixer, void * arg) {
	AlsaStreamAudioT * stream = (AlsaStreamAudioT*) arg;
	int error = 0;
	AFB_API_DEBUG(mixer->api, "%s... %s", __func__, stream->uid);

	if (stream->noHwDetected)
		goto freemem;

	error = afb_api_del_verb(mixer->api, stream->uid, (void**)stream->verbApiHandle);
	if (error) {
		AFB_API_DEBUG(mixer->api, "%s: failed to remove verb %s", __func__, stream->uid);
    }

	AlsaPcmCopyStop(mixer, stream->copy);

freemem:

	free((char*)stream->uid);
	free((char*)stream->playback);
	free((char*)stream->ramp);
	free((char*)stream->sink);
	free((char*)stream->source);
	free((char*)stream->verb);

	ApiPcmDelParams(mixer, stream->params);

	cds_list_del(&stream->list);
	mixer->nbStreams--;

	free(stream);
	// uid is no available anymore at this position
	AFB_API_DEBUG(mixer->api, "%s... DONE !", __func__);
}

static AlsaStreamAudioT * streamCreate(SoftMixerT * mixer, const char * uid, const char * prefix, json_object * argsJ) {
	AlsaStreamAudioT * newStream = AttachOneStream(mixer, uid, prefix, argsJ);
	if (!newStream) {
		goto fail;
	}
	mixer->nbStreams++;
	cds_list_add_tail(&newStream->list, &mixer->streams.list);

	AlsaMixerTransactionObjectAdd(mixer->transaction, newStream, streamDestroy);
fail:
	return newStream;
}

PUBLIC int ApiStreamAttach(SoftMixerT *mixer, afb_req_t request, const char * uid, const char *prefix, json_object * argsJ) {

	AFB_API_DEBUG(mixer->api, "%s: %s prefix %s", __func__, uid, prefix);

	AlsaStreamAudioT * newStream = NULL;

	if (mixer->nbLoops == 0) {
		AFB_API_ERROR(mixer->api, "%s: mixer=%s No Loop found [should Registry snd_loop first]", __func__, mixer->uid);
		goto fail;
    }

	if (mixer->nbStreams >= mixer->max.streams) {
		afb_req_fail_f(request, "too-small", "mixer=%s max stream=%d", mixer->uid, mixer->max.streams);
		goto fail;
    }

    switch (json_object_get_type(argsJ)) {
        long count;

        case json_type_object:
			newStream = streamCreate(mixer, uid, prefix, argsJ);
			if (!newStream) {
                afb_req_fail_f(request, "bad-stream", "mixer=%s invalid stream= %s", mixer->uid, json_object_get_string(argsJ));
				goto fail;
            }
			if (newStream->noHwDetected)
				AlsaMixerTransactionObjectDelete(mixer->transaction, newStream, true);

            break;

        case json_type_array:

            count = json_object_array_length(argsJ);
			if (count > (mixer->max.streams - mixer->nbStreams)) {
                afb_req_fail_f(request,
                             "too-small",
                             "mixer=%s max stream=%d", mixer->uid, mixer->max.streams);
				goto fail;
            }

            for (int idx = 0; idx < count; idx++) {
                json_object *streamJ = json_object_array_get_idx(argsJ, idx);
				newStream = streamCreate(mixer, uid, prefix, streamJ);
				if (!newStream) {
                    afb_req_fail_f(request,
                                 "bad-stream",
                                 "%s: mixer=%s invalid stream= %s",
                                 __func__, mixer->uid, json_object_get_string(streamJ));
					goto fail;
				}
				if (newStream->noHwDetected)
					AlsaMixerTransactionObjectDelete(mixer->transaction, newStream, true);

            }
            break;
        default:
            afb_req_fail_f(request,
                         "invalid-syntax",
                         "mixer=%s streams invalid argsJ= %s", mixer->uid, json_object_get_string(argsJ));
			goto fail;
    }

    return 0;

fail:
	AFB_API_ERROR(mixer->api, "%s FAILED\n", __func__);
    return -1;
}