/[svn]/liblscp/trunk/src/client.c
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Contents of /liblscp/trunk/src/client.c

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Revision 279 - (show annotations) (download)
Mon Oct 11 12:22:40 2004 UTC (15 years, 5 months ago) by capela
File MIME type: text/plain
File size: 46996 byte(s)
* Fixed lscp_get_channel_info() to parse MIDI omni (ALL) channels mode.

1 // client.c
2 //
3 /****************************************************************************
4 liblscp - LinuxSampler Control Protocol API
5 Copyright (C) 2004, rncbc aka Rui Nuno Capela. All rights reserved.
6
7 This library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 This library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with this library; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20
21 *****************************************************************************/
22
23 #include "common.h"
24
25 // Default timeout value (in milliseconds).
26 #define LSCP_TIMEOUT_MSECS 500
27
28
29 // Local prototypes.
30
31 static void _lscp_client_evt_proc (void *pvClient);
32
33 static lscp_status_t _lscp_client_evt_connect (lscp_client_t *pClient);
34 static lscp_status_t _lscp_client_evt_request (lscp_client_t *pClient, int iSubscribe, lscp_event_t event);
35
36
37 //-------------------------------------------------------------------------
38 // Event service (datagram oriented).
39
40 static void _lscp_client_evt_proc ( void *pvClient )
41 {
42 lscp_client_t *pClient = (lscp_client_t *) pvClient;
43
44 fd_set fds; // File descriptor list for select().
45 int fd, fdmax; // Maximum file descriptor number.
46 struct timeval tv; // For specifying a timeout value.
47 int iSelect; // Holds select return status.
48 int iTimeout;
49
50 char achBuffer[LSCP_BUFSIZ];
51 int cchBuffer;
52 const char *pszSeps = ":\r\n";
53 char * pszToken;
54 char * pch;
55 int cchToken;
56 lscp_event_t event;
57
58 #ifdef DEBUG
59 fprintf(stderr, "_lscp_client_evt_proc: Client waiting for events.\n");
60 #endif
61
62 while (pClient->evt.iState) {
63
64 // Prepare for waiting on select...
65 fd = (int) pClient->evt.sock;
66 FD_ZERO(&fds);
67 FD_SET((unsigned int) fd, &fds);
68 fdmax = fd;
69
70 // Use the timeout (x10) select feature ...
71 iTimeout = 10 * pClient->iTimeout;
72 if (iTimeout > 1000) {
73 tv.tv_sec = iTimeout / 1000;
74 iTimeout -= tv.tv_sec * 1000;
75 }
76 else tv.tv_sec = 0;
77 tv.tv_usec = iTimeout * 1000;
78
79 // Wait for event...
80 iSelect = select(fdmax + 1, &fds, NULL, NULL, &tv);
81 if (iSelect > 0 && FD_ISSET(fd, &fds)) {
82 // May recv now...
83 cchBuffer = recv(pClient->evt.sock, achBuffer, sizeof(achBuffer), 0);
84 if (cchBuffer > 0) {
85 // Make sure received buffer it's null terminated.
86 achBuffer[cchBuffer] = (char) 0;
87 // Parse for the notification event message...
88 pszToken = lscp_strtok(achBuffer, pszSeps, &(pch)); // Have "NOTIFY".
89 if (strcasecmp(pszToken, "NOTIFY") == 0) {
90 pszToken = lscp_strtok(NULL, pszSeps, &(pch));
91 event = lscp_event_from_text(pszToken);
92 // And pick the rest of data...
93 pszToken = lscp_strtok(NULL, pszSeps, &(pch));
94 cchToken = (pszToken == NULL ? 0 : strlen(pszToken));
95 // Double-check if we're really up to it...
96 if (pClient->events & event) {
97 // Invoke the client event callback...
98 if ((*pClient->pfnCallback)(
99 pClient,
100 event,
101 pszToken,
102 cchToken,
103 pClient->pvData) != LSCP_OK) {
104 pClient->evt.iState = 0;
105 }
106 }
107 }
108 } else {
109 lscp_socket_perror("_lscp_client_evt_proc: recv");
110 pClient->evt.iState = 0;
111 }
112 } // Check if select has in error.
113 else if (iSelect < 0) {
114 lscp_socket_perror("_lscp_client_call: select");
115 pClient->evt.iState = 0;
116 }
117
118 // Finally, always signal the event.
119 lscp_cond_signal(pClient->cond);
120 }
121
122 #ifdef DEBUG
123 fprintf(stderr, "_lscp_client_evt_proc: Client closing.\n");
124 #endif
125 }
126
127
128 //-------------------------------------------------------------------------
129 // Event subscription helpers.
130
131 // Open the event service socket connection.
132 static lscp_status_t _lscp_client_evt_connect ( lscp_client_t *pClient )
133 {
134 lscp_socket_t sock;
135 struct sockaddr_in addr;
136 int cAddr;
137 #if defined(WIN32)
138 int iSockOpt = (-1);
139 #endif
140
141 // Prepare the event connection socket...
142 sock = socket(AF_INET, SOCK_STREAM, 0);
143 if (sock == INVALID_SOCKET) {
144 lscp_socket_perror("_lscp_client_evt_connect: socket");
145 return LSCP_FAILED;
146 }
147
148 #if defined(WIN32)
149 if (setsockopt(sock, SOL_SOCKET, SO_DONTLINGER, (char *) &iSockOpt, sizeof(int)) == SOCKET_ERROR)
150 lscp_socket_perror("lscp_client_evt_connect: setsockopt(SO_DONTLINGER)");
151 #endif
152
153 #ifdef DEBUG
154 lscp_socket_getopts("_lscp_client_evt_connect:", sock);
155 #endif
156
157 // Use same address of the command connection.
158 cAddr = sizeof(struct sockaddr_in);
159 memmove((char *) &addr, &(pClient->cmd.addr), cAddr);
160
161 // Start the connection...
162 if (connect(sock, (struct sockaddr *) &addr, cAddr) == SOCKET_ERROR) {
163 lscp_socket_perror("_lscp_client_evt_connect: connect");
164 closesocket(sock);
165 return LSCP_FAILED;
166 }
167
168 // Set our socket agent struct...
169 lscp_socket_agent_init(&(pClient->evt), sock, &addr, cAddr);
170
171 // And finally the service thread...
172 return lscp_socket_agent_start(&(pClient->evt), _lscp_client_evt_proc, pClient, 0);
173 }
174
175
176 // Subscribe to a single event.
177 static lscp_status_t _lscp_client_evt_request ( lscp_client_t *pClient, int iSubscribe, lscp_event_t event )
178 {
179 const char *pszEvent;
180 char szQuery[LSCP_BUFSIZ];
181 int cchQuery;
182
183 if (pClient == NULL)
184 return LSCP_FAILED;
185
186 // Which (single) event?
187 pszEvent = lscp_event_to_text(event);
188 if (pszEvent == NULL)
189 return LSCP_FAILED;
190
191 // Build the query string...
192 cchQuery = sprintf(szQuery, "%sSUBSCRIBE %s\n\n", (iSubscribe == 0 ? "UN" : ""), pszEvent);
193 // Just send data, forget result...
194 if (send(pClient->evt.sock, szQuery, cchQuery, 0) < cchQuery) {
195 lscp_socket_perror("_lscp_client_evt_request: send");
196 return LSCP_FAILED;
197 }
198
199 // Wait on response.
200 lscp_cond_wait(pClient->cond, pClient->mutex);
201
202 // Update as naively as we can...
203 if (iSubscribe)
204 pClient->events |= event;
205 else
206 pClient->events &= ~event;
207
208 return LSCP_OK;
209 }
210
211
212 //-------------------------------------------------------------------------
213 // Client versioning teller fuunction.
214
215
216 /** Retrieve the current client library version string. */
217 const char* lscp_client_package (void) { return LSCP_PACKAGE; }
218
219 /** Retrieve the current client library version string. */
220 const char* lscp_client_version (void) { return LSCP_VERSION; }
221
222 /** Retrieve the current client library build timestamp string. */
223 const char* lscp_client_build (void) { return __DATE__ " " __TIME__; }
224
225
226 //-------------------------------------------------------------------------
227 // Client socket functions.
228
229 /**
230 * Create a client instance, estabilishing a connection to a server hostname,
231 * which must be listening on the given port. A client callback function is
232 * also supplied for server notification event handling.
233 *
234 * @param pszHost Hostname of the linuxsampler listening server.
235 * @param iPort Port number of the linuxsampler listening server.
236 * @param pfnCallback Callback function to receive event notifications.
237 * @param pvData User context opaque data, that will be passed
238 * to the callback function.
239 *
240 * @returns The new client instance pointer if successfull, which shall be
241 * used on all subsequent client calls, NULL otherwise.
242 */
243 lscp_client_t* lscp_client_create ( const char *pszHost, int iPort, lscp_client_proc_t pfnCallback, void *pvData )
244 {
245 lscp_client_t *pClient;
246 struct hostent *pHost;
247 lscp_socket_t sock;
248 struct sockaddr_in addr;
249 int cAddr;
250 #if defined(WIN32)
251 int iSockOpt = (-1);
252 #endif
253
254 if (pfnCallback == NULL) {
255 fprintf(stderr, "lscp_client_create: Invalid client callback function.\n");
256 return NULL;
257 }
258
259 pHost = gethostbyname(pszHost);
260 if (pHost == NULL) {
261 lscp_socket_herror("lscp_client_create: gethostbyname");
262 return NULL;
263 }
264
265 // Allocate client descriptor...
266
267 pClient = (lscp_client_t *) malloc(sizeof(lscp_client_t));
268 if (pClient == NULL) {
269 fprintf(stderr, "lscp_client_create: Out of memory.\n");
270 return NULL;
271 }
272 memset(pClient, 0, sizeof(lscp_client_t));
273
274 pClient->pfnCallback = pfnCallback;
275 pClient->pvData = pvData;
276
277 #ifdef DEBUG
278 fprintf(stderr, "lscp_client_create: pClient=%p: pszHost=%s iPort=%d.\n", pClient, pszHost, iPort);
279 #endif
280
281 // Prepare the command connection socket...
282
283 sock = socket(AF_INET, SOCK_STREAM, 0);
284 if (sock == INVALID_SOCKET) {
285 lscp_socket_perror("lscp_client_create: cmd: socket");
286 free(pClient);
287 return NULL;
288 }
289
290 #if defined(WIN32)
291 if (setsockopt(sock, SOL_SOCKET, SO_DONTLINGER, (char *) &iSockOpt, sizeof(int)) == SOCKET_ERROR)
292 lscp_socket_perror("lscp_client_create: cmd: setsockopt(SO_DONTLINGER)");
293 #endif
294
295 #ifdef DEBUG
296 lscp_socket_getopts("lscp_client_create: cmd", sock);
297 #endif
298
299 cAddr = sizeof(struct sockaddr_in);
300 memset((char *) &addr, 0, cAddr);
301 addr.sin_family = pHost->h_addrtype;
302 memmove((char *) &(addr.sin_addr), pHost->h_addr, pHost->h_length);
303 addr.sin_port = htons((short) iPort);
304
305 if (connect(sock, (struct sockaddr *) &addr, cAddr) == SOCKET_ERROR) {
306 lscp_socket_perror("lscp_client_create: cmd: connect");
307 closesocket(sock);
308 free(pClient);
309 return NULL;
310 }
311
312 // Initialize the command socket agent struct...
313 lscp_socket_agent_init(&(pClient->cmd), sock, &addr, cAddr);
314
315 #ifdef DEBUG
316 fprintf(stderr, "lscp_client_create: cmd: pClient=%p: sock=%d addr=%s port=%d.\n", pClient, pClient->cmd.sock, inet_ntoa(pClient->cmd.addr.sin_addr), ntohs(pClient->cmd.addr.sin_port));
317 #endif
318
319 // Initialize the event service socket struct...
320 lscp_socket_agent_init(&(pClient->evt), INVALID_SOCKET, NULL, 0);
321 // No events subscribed, yet.
322 pClient->events = LSCP_EVENT_NONE;
323 // Initialize cached members.
324 pClient->audio_drivers = NULL;
325 pClient->midi_drivers = NULL;
326 pClient->audio_devices = NULL;
327 pClient->midi_devices = NULL;
328 pClient->engines = NULL;
329 pClient->channels = NULL;
330 lscp_driver_info_init(&(pClient->audio_driver_info));
331 lscp_driver_info_init(&(pClient->midi_driver_info));
332 lscp_device_info_init(&(pClient->audio_device_info));
333 lscp_device_info_init(&(pClient->midi_device_info));
334 lscp_param_info_init(&(pClient->audio_param_info));
335 lscp_param_info_init(&(pClient->midi_param_info));
336 lscp_device_port_info_init(&(pClient->audio_channel_info));
337 lscp_device_port_info_init(&(pClient->midi_port_info));
338 lscp_param_info_init(&(pClient->audio_channel_param_info));
339 lscp_param_info_init(&(pClient->midi_port_param_info));
340 lscp_engine_info_init(&(pClient->engine_info));
341 lscp_channel_info_init(&(pClient->channel_info));
342 // Initialize error stuff.
343 pClient->pszResult = NULL;
344 pClient->iErrno = -1;
345 // Stream usage stuff.
346 pClient->buffer_fill = NULL;
347 pClient->iStreamCount = 0;
348 // Default timeout value.
349 pClient->iTimeout = LSCP_TIMEOUT_MSECS;
350
351 // Initialize the transaction mutex.
352 lscp_mutex_init(pClient->mutex);
353 lscp_cond_init(pClient->cond);
354
355 // Finally we've some success...
356 return pClient;
357 }
358
359
360 /**
361 * Wait for a client instance to terminate graciously.
362 *
363 * @param pClient Pointer to client instance structure.
364 */
365 lscp_status_t lscp_client_join ( lscp_client_t *pClient )
366 {
367 if (pClient == NULL)
368 return LSCP_FAILED;
369
370 #ifdef DEBUG
371 fprintf(stderr, "lscp_client_join: pClient=%p.\n", pClient);
372 #endif
373
374 // lscp_socket_agent_join(&(pClient->evt));
375 lscp_socket_agent_join(&(pClient->cmd));
376
377 return LSCP_OK;
378 }
379
380
381 /**
382 * Terminate and destroy a client instance.
383 *
384 * @param pClient Pointer to client instance structure.
385 *
386 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
387 */
388 lscp_status_t lscp_client_destroy ( lscp_client_t *pClient )
389 {
390 if (pClient == NULL)
391 return LSCP_FAILED;
392
393 #ifdef DEBUG
394 fprintf(stderr, "lscp_client_destroy: pClient=%p.\n", pClient);
395 #endif
396
397 // Lock this section up.
398 lscp_mutex_lock(pClient->mutex);
399
400 // Free up all cached members.
401 lscp_channel_info_free(&(pClient->channel_info));
402 lscp_engine_info_free(&(pClient->engine_info));
403 lscp_param_info_free(&(pClient->midi_port_param_info));
404 lscp_param_info_free(&(pClient->audio_channel_param_info));
405 lscp_device_port_info_free(&(pClient->midi_port_info));
406 lscp_device_port_info_free(&(pClient->audio_channel_info));
407 lscp_param_info_free(&(pClient->midi_param_info));
408 lscp_param_info_free(&(pClient->audio_param_info));
409 lscp_device_info_free(&(pClient->midi_device_info));
410 lscp_device_info_free(&(pClient->audio_device_info));
411 lscp_driver_info_free(&(pClient->midi_driver_info));
412 lscp_driver_info_free(&(pClient->audio_driver_info));
413 // Free available engine table.
414 lscp_szsplit_destroy(pClient->audio_drivers);
415 lscp_szsplit_destroy(pClient->midi_drivers);
416 lscp_isplit_destroy(pClient->audio_devices);
417 lscp_isplit_destroy(pClient->midi_devices);
418 lscp_szsplit_destroy(pClient->engines);
419 lscp_isplit_destroy(pClient->channels);
420 // Make them null.
421 pClient->audio_drivers = NULL;
422 pClient->midi_drivers = NULL;
423 pClient->engines = NULL;
424 // Free result error stuff.
425 lscp_client_set_result(pClient, NULL, 0);
426 // Free stream usage stuff.
427 if (pClient->buffer_fill)
428 free(pClient->buffer_fill);
429 pClient->buffer_fill = NULL;
430 pClient->iStreamCount = 0;
431 pClient->iTimeout = 0;
432
433 // Free socket agents.
434 lscp_socket_agent_free(&(pClient->evt));
435 lscp_socket_agent_free(&(pClient->cmd));
436
437 // Last but not least, free good ol'transaction mutex.
438 lscp_mutex_unlock(pClient->mutex);
439 lscp_mutex_destroy(pClient->mutex);
440 lscp_cond_destroy(pClient->cond);
441
442 free(pClient);
443
444 return LSCP_OK;
445 }
446
447
448 /**
449 * Set the client transaction timeout interval.
450 *
451 * @param pClient Pointer to client instance structure.
452 * @param iTimeout Transaction timeout in milliseconds.
453 *
454 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
455 */
456 lscp_status_t lscp_client_set_timeout ( lscp_client_t *pClient, int iTimeout )
457 {
458 if (pClient == NULL)
459 return LSCP_FAILED;
460 if (iTimeout < 0)
461 return LSCP_FAILED;
462
463 pClient->iTimeout = iTimeout;
464 return LSCP_OK;
465 }
466
467
468 /**
469 * Get the client transaction timeout interval.
470 *
471 * @param pClient Pointer to client instance structure.
472 *
473 * @returns The current timeout value milliseconds, -1 in case of failure.
474 */
475 int lscp_client_get_timeout ( lscp_client_t *pClient )
476 {
477 if (pClient == NULL)
478 return -1;
479
480 return pClient->iTimeout;
481 }
482
483
484 //-------------------------------------------------------------------------
485 // Client common protocol functions.
486
487 /**
488 * Submit a command query line string to the server. The query string
489 * must be cr/lf and null terminated. Besides the return code, the
490 * specific server response to the command request is made available
491 * by the @ref lscp_client_get_result and @ref lscp_client_get_errno
492 * function calls.
493 *
494 * @param pClient Pointer to client instance structure.
495 * @param pszQuery Command request line to be sent to server,
496 * must be cr/lf and null terminated.
497 *
498 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
499 */
500 lscp_status_t lscp_client_query ( lscp_client_t *pClient, const char *pszQuery )
501 {
502 lscp_status_t ret;
503
504 // Lock this section up.
505 lscp_mutex_lock(pClient->mutex);
506
507 // Just make the now guarded call.
508 ret = lscp_client_call(pClient, pszQuery);
509
510 // Unlock this section down.
511 lscp_mutex_unlock(pClient->mutex);
512
513 return ret;
514 }
515
516 /**
517 * Get the last received result string. In case of error or warning,
518 * this is the text of the error or warning message issued.
519 *
520 * @param pClient Pointer to client instance structure.
521 *
522 * @returns A pointer to the literal null-terminated result string as
523 * of the last command request.
524 */
525 const char *lscp_client_get_result ( lscp_client_t *pClient )
526 {
527 if (pClient == NULL)
528 return NULL;
529
530 return pClient->pszResult;
531 }
532
533
534 /**
535 * Get the last error/warning number received.
536 *
537 * @param pClient Pointer to client instance structure.
538 *
539 * @returns The numerical value of the last error or warning
540 * response code received.
541 */
542 int lscp_client_get_errno ( lscp_client_t *pClient )
543 {
544 if (pClient == NULL)
545 return -1;
546
547 return pClient->iErrno;
548 }
549
550
551 //-------------------------------------------------------------------------
552 // Client registration protocol functions.
553
554 /**
555 * Register frontend for receiving event messages:
556 * SUBSCRIBE CHANNELS | VOICE_COUNT | STREAM_COUNT | BUFFER_FILL
557 * | CHANNEL_INFO | MISCELLANEOUS
558 *
559 * @param pClient Pointer to client instance structure.
560 * @param events Bit-wise OR'ed event flags to subscribe.
561 *
562 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
563 */
564 lscp_status_t lscp_client_subscribe ( lscp_client_t *pClient, lscp_event_t events )
565 {
566 lscp_status_t ret = LSCP_FAILED;
567
568 if (pClient == NULL)
569 return LSCP_FAILED;
570
571 // Lock this section up.
572 lscp_mutex_lock(pClient->mutex);
573
574 // If applicable, start the alternate connection...
575 if (pClient->events == LSCP_EVENT_NONE)
576 ret = _lscp_client_evt_connect(pClient);
577
578 // Send the subscription commands.
579 if (ret == LSCP_OK && (events & LSCP_EVENT_CHANNELS))
580 ret = _lscp_client_evt_request(pClient, 1, LSCP_EVENT_CHANNELS);
581 if (ret == LSCP_OK && (events & LSCP_EVENT_VOICE_COUNT))
582 ret = _lscp_client_evt_request(pClient, 1, LSCP_EVENT_VOICE_COUNT);
583 if (ret == LSCP_OK && (events & LSCP_EVENT_STREAM_COUNT))
584 ret = _lscp_client_evt_request(pClient, 1, LSCP_EVENT_STREAM_COUNT);
585 if (ret == LSCP_OK && (events & LSCP_EVENT_BUFFER_FILL))
586 ret = _lscp_client_evt_request(pClient, 1, LSCP_EVENT_BUFFER_FILL);
587 if (ret == LSCP_OK && (events & LSCP_EVENT_CHANNEL_INFO))
588 ret = _lscp_client_evt_request(pClient, 1, LSCP_EVENT_CHANNEL_INFO);
589 if (ret == LSCP_OK && (events & LSCP_EVENT_MISCELLANEOUS))
590 ret = _lscp_client_evt_request(pClient, 1, LSCP_EVENT_MISCELLANEOUS);
591
592 // Unlock this section down.
593 lscp_mutex_unlock(pClient->mutex);
594
595 return ret;
596 }
597
598
599 /**
600 * Deregister frontend from receiving UDP event messages anymore:
601 * SUBSCRIBE CHANNELS | VOICE_COUNT | STREAM_COUNT | BUFFER_FILL
602 * | CHANNEL_INFO | MISCELLANEOUS
603 *
604 * @param pClient Pointer to client instance structure.
605 * @param events Bit-wise OR'ed event flags to unsubscribe.
606 *
607 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
608 */
609 lscp_status_t lscp_client_unsubscribe ( lscp_client_t *pClient, lscp_event_t events )
610 {
611 lscp_status_t ret = LSCP_OK;
612
613 if (pClient == NULL)
614 return LSCP_FAILED;
615
616 // Lock this section up.
617 lscp_mutex_lock(pClient->mutex);
618
619 // Send the unsubscription commands.
620 if (ret == LSCP_OK && (events & LSCP_EVENT_CHANNELS))
621 ret = _lscp_client_evt_request(pClient, 0, LSCP_EVENT_CHANNELS);
622 if (ret == LSCP_OK && (events & LSCP_EVENT_VOICE_COUNT))
623 ret = _lscp_client_evt_request(pClient, 0, LSCP_EVENT_VOICE_COUNT);
624 if (ret == LSCP_OK && (events & LSCP_EVENT_STREAM_COUNT))
625 ret = _lscp_client_evt_request(pClient, 0, LSCP_EVENT_STREAM_COUNT);
626 if (ret == LSCP_OK && (events & LSCP_EVENT_BUFFER_FILL))
627 ret = _lscp_client_evt_request(pClient, 0, LSCP_EVENT_BUFFER_FILL);
628 if (ret == LSCP_OK && (events & LSCP_EVENT_CHANNEL_INFO))
629 ret = _lscp_client_evt_request(pClient, 0, LSCP_EVENT_CHANNEL_INFO);
630 if (ret == LSCP_OK && (events & LSCP_EVENT_MISCELLANEOUS))
631 ret = _lscp_client_evt_request(pClient, 0, LSCP_EVENT_MISCELLANEOUS);
632
633 // If necessary, close the alternate connection...
634 if (pClient->events == LSCP_EVENT_NONE)
635 lscp_socket_agent_free(&(pClient->evt));
636
637 // Unlock this section down.
638 lscp_mutex_unlock(pClient->mutex);
639
640 return ret;
641 }
642
643
644 /**
645 * Getting current subscribed events.
646 *
647 * @param pClient Pointer to client instance structure.
648 *
649 * @returns The current subscrived bit-wise OR'ed event flags.
650 */
651 lscp_event_t lscp_client_get_events ( lscp_client_t *pClient )
652 {
653 if (pClient == NULL)
654 return LSCP_EVENT_NONE;
655
656 return pClient->events;
657 }
658
659
660 //-------------------------------------------------------------------------
661 // Client command protocol functions.
662
663 /**
664 * Loading an instrument:
665 * LOAD INSTRUMENT <filename> <instr-index> <sampler-channel>
666 *
667 * @param pClient Pointer to client instance structure.
668 * @param pszFileName Instrument file name.
669 * @param iInstrIndex Instrument index number.
670 * @param iSamplerChannel Sampler Channel.
671 *
672 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
673 */
674 lscp_status_t lscp_load_instrument ( lscp_client_t *pClient, const char *pszFileName, int iInstrIndex, int iSamplerChannel )
675 {
676 char szQuery[LSCP_BUFSIZ];
677
678 if (pszFileName == NULL || iSamplerChannel < 0)
679 return LSCP_FAILED;
680
681 sprintf(szQuery, "LOAD INSTRUMENT '%s' %d %d\r\n", pszFileName, iInstrIndex, iSamplerChannel);
682 return lscp_client_query(pClient, szQuery);
683 }
684
685
686 /**
687 * Loading an instrument in the background (non modal):
688 * LOAD INSTRUMENT NON_MODAL <filename> <instr-index> <sampler-channel>
689 *
690 * @param pClient Pointer to client instance structure.
691 * @param pszFileName Instrument file name.
692 * @param iInstrIndex Instrument index number.
693 * @param iSamplerChannel Sampler Channel.
694 *
695 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
696 */
697 lscp_status_t lscp_load_instrument_non_modal ( lscp_client_t *pClient, const char *pszFileName, int iInstrIndex, int iSamplerChannel )
698 {
699 char szQuery[LSCP_BUFSIZ];
700
701 if (pszFileName == NULL || iSamplerChannel < 0)
702 return LSCP_FAILED;
703
704 sprintf(szQuery, "LOAD INSTRUMENT NON_MODAL '%s' %d %d\r\n", pszFileName, iInstrIndex, iSamplerChannel);
705 return lscp_client_query(pClient, szQuery);
706 }
707
708
709 /**
710 * Loading a sampler engine:
711 * LOAD ENGINE <engine-name> <sampler-channel>
712 *
713 * @param pClient Pointer to client instance structure.
714 * @param pszEngineName Engine name.
715 * @param iSamplerChannel Sampler channel number.
716 *
717 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
718 */
719 lscp_status_t lscp_load_engine ( lscp_client_t *pClient, const char *pszEngineName, int iSamplerChannel )
720 {
721 char szQuery[LSCP_BUFSIZ];
722
723 if (pszEngineName == NULL || iSamplerChannel < 0)
724 return LSCP_FAILED;
725
726 sprintf(szQuery, "LOAD ENGINE %s %d\r\n", pszEngineName, iSamplerChannel);
727 return lscp_client_query(pClient, szQuery);
728 }
729
730
731 /**
732 * Current number of sampler channels:
733 * GET CHANNELS
734 *
735 * @param pClient Pointer to client instance structure.
736 *
737 * @returns The current total number of sampler channels on success,
738 * -1 otherwise.
739 */
740 int lscp_get_channels ( lscp_client_t *pClient )
741 {
742 int iChannels = -1;
743
744 // Lock this section up.
745 lscp_mutex_lock(pClient->mutex);
746
747 if (lscp_client_call(pClient, "GET CHANNELS\r\n") == LSCP_OK)
748 iChannels = atoi(lscp_client_get_result(pClient));
749
750 // Unlock this section doen.
751 lscp_mutex_unlock(pClient->mutex);
752
753 return iChannels;
754 }
755
756
757 /**
758 * List current sampler channels number identifiers:
759 * LIST CHANNELS
760 *
761 * @param pClient Pointer to client instance structure.
762 *
763 * @returns An array of the sampler channels identifiers as positive integers,
764 * terminated with -1 on success, NULL otherwise.
765 */
766 int *lscp_list_channels ( lscp_client_t *pClient )
767 {
768 const char *pszSeps = ",";
769
770 if (pClient == NULL)
771 return NULL;
772
773 // Lock this section up.
774 lscp_mutex_lock(pClient->mutex);
775
776 if (pClient->channels) {
777 lscp_isplit_destroy(pClient->channels);
778 pClient->channels = NULL;
779 }
780
781 if (lscp_client_call(pClient, "LIST CHANNELS\r\n") == LSCP_OK)
782 pClient->channels = lscp_isplit_create(lscp_client_get_result(pClient), pszSeps);
783
784 // Unlock this section down.
785 lscp_mutex_unlock(pClient->mutex);
786
787 return pClient->channels;
788 }
789
790
791 /**
792 * Adding a new sampler channel:
793 * ADD CHANNEL
794 *
795 * @param pClient Pointer to client instance structure.
796 *
797 * @returns The new sampler channel number identifier,
798 * or -1 in case of failure.
799 */
800 int lscp_add_channel ( lscp_client_t *pClient )
801 {
802 int iSamplerChannel = -1;
803
804 // Lock this section up.
805 lscp_mutex_lock(pClient->mutex);
806
807 if (lscp_client_call(pClient, "ADD CHANNEL\r\n") == LSCP_OK)
808 iSamplerChannel = atoi(lscp_client_get_result(pClient));
809
810 // Unlock this section down.
811 lscp_mutex_unlock(pClient->mutex);
812
813 return iSamplerChannel;
814 }
815
816
817 /**
818 * Removing a sampler channel:
819 * REMOVE CHANNEL <sampler-channel>
820 *
821 * @param pClient Pointer to client instance structure.
822 * @param iSamplerChannel Sampler channel number.
823 *
824 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
825 */
826 lscp_status_t lscp_remove_channel ( lscp_client_t *pClient, int iSamplerChannel )
827 {
828 char szQuery[LSCP_BUFSIZ];
829
830 if (iSamplerChannel < 0)
831 return LSCP_FAILED;
832
833 sprintf(szQuery, "REMOVE CHANNEL %d\r\n", iSamplerChannel);
834 return lscp_client_query(pClient, szQuery);
835 }
836
837
838 /**
839 * Getting all available engines:
840 * GET AVAILABLE_ENGINES
841 *
842 * @param pClient Pointer to client instance structure.
843 *
844 * @returns A NULL terminated array of engine name strings,
845 * or NULL in case of failure.
846 */
847 const char **lscp_get_available_engines ( lscp_client_t *pClient )
848 {
849 const char *pszSeps = ",";
850
851 // Lock this section up.
852 lscp_mutex_lock(pClient->mutex);
853
854 if (pClient->engines) {
855 lscp_szsplit_destroy(pClient->engines);
856 pClient->engines = NULL;
857 }
858
859 if (lscp_client_call(pClient, "GET AVAILABLE_ENGINES\r\n") == LSCP_OK)
860 pClient->engines = lscp_szsplit_create(lscp_client_get_result(pClient), pszSeps);
861
862 // Unlock this section down.
863 lscp_mutex_unlock(pClient->mutex);
864
865 return (const char **) pClient->engines;
866 }
867
868
869 /**
870 * Getting information about an engine.
871 * GET ENGINE INFO <engine-name>
872 *
873 * @param pClient Pointer to client instance structure.
874 * @param pszEngineName Engine name.
875 *
876 * @returns A pointer to a @ref lscp_engine_info_t structure, with all the
877 * information of the given sampler engine, or NULL in case of failure.
878 */
879 lscp_engine_info_t *lscp_get_engine_info ( lscp_client_t *pClient, const char *pszEngineName )
880 {
881 lscp_engine_info_t *pEngineInfo;
882 char szQuery[LSCP_BUFSIZ];
883 const char *pszResult;
884 const char *pszSeps = ":";
885 const char *pszCrlf = "\r\n";
886 char *pszToken;
887 char *pch;
888
889 if (pszEngineName == NULL)
890 return NULL;
891
892 // Lock this section up.
893 lscp_mutex_lock(pClient->mutex);
894
895 pEngineInfo = &(pClient->engine_info);
896 lscp_engine_info_reset(pEngineInfo);
897
898 sprintf(szQuery, "GET ENGINE INFO %s\r\n", pszEngineName);
899 if (lscp_client_call(pClient, szQuery) == LSCP_OK) {
900 pszResult = lscp_client_get_result(pClient);
901 pszToken = lscp_strtok((char *) pszResult, pszSeps, &(pch));
902 while (pszToken) {
903 if (strcasecmp(pszToken, "DESCRIPTION") == 0) {
904 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
905 if (pszToken)
906 lscp_unquote_dup(&(pEngineInfo->description), &pszToken);
907 }
908 else if (strcasecmp(pszToken, "VERSION") == 0) {
909 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
910 if (pszToken)
911 lscp_unquote_dup(&(pEngineInfo->version), &pszToken);
912 }
913 pszToken = lscp_strtok(NULL, pszSeps, &(pch));
914 }
915 }
916 else pEngineInfo = NULL;
917
918 // Unlock this section down.
919 lscp_mutex_unlock(pClient->mutex);
920
921 return pEngineInfo;
922 }
923
924
925 /**
926 * Getting sampler channel informations:
927 * GET CHANNEL INFO <sampler-channel>
928 *
929 * @param pClient Pointer to client instance structure.
930 * @param iSamplerChannel Sampler channel number.
931 *
932 * @returns A pointer to a @ref lscp_channel_info_t structure, with all the
933 * information of the given sampler channel, or NULL in case of failure.
934 */
935 lscp_channel_info_t *lscp_get_channel_info ( lscp_client_t *pClient, int iSamplerChannel )
936 {
937 lscp_channel_info_t *pChannelInfo;
938 char szQuery[LSCP_BUFSIZ];
939 const char *pszResult;
940 const char *pszSeps = ":";
941 const char *pszCrlf = "\r\n";
942 char *pszToken;
943 char *pch;
944
945 if (iSamplerChannel < 0)
946 return NULL;
947
948 // Lock this section up.
949 lscp_mutex_lock(pClient->mutex);
950
951 pChannelInfo = &(pClient->channel_info);
952 lscp_channel_info_reset(pChannelInfo);
953
954 sprintf(szQuery, "GET CHANNEL INFO %d\r\n", iSamplerChannel);
955 if (lscp_client_call(pClient, szQuery) == LSCP_OK) {
956 pszResult = lscp_client_get_result(pClient);
957 pszToken = lscp_strtok((char *) pszResult, pszSeps, &(pch));
958 while (pszToken) {
959 if (strcasecmp(pszToken, "ENGINE_NAME") == 0) {
960 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
961 if (pszToken)
962 lscp_unquote_dup(&(pChannelInfo->engine_name), &pszToken);
963 }
964 else if (strcasecmp(pszToken, "AUDIO_OUTPUT_DEVICE") == 0) {
965 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
966 if (pszToken)
967 pChannelInfo->audio_device = atoi(lscp_ltrim(pszToken));
968 }
969 else if (strcasecmp(pszToken, "AUDIO_OUTPUT_CHANNELS") == 0) {
970 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
971 if (pszToken)
972 pChannelInfo->audio_channels = atoi(lscp_ltrim(pszToken));
973 }
974 else if (strcasecmp(pszToken, "AUDIO_OUTPUT_ROUTING") == 0) {
975 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
976 if (pszToken) {
977 if (pChannelInfo->audio_routing)
978 lscp_szsplit_destroy(pChannelInfo->audio_routing);
979 pChannelInfo->audio_routing = lscp_szsplit_create(pszToken, ",");
980 }
981 }
982 else if (strcasecmp(pszToken, "INSTRUMENT_FILE") == 0) {
983 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
984 if (pszToken)
985 lscp_unquote_dup(&(pChannelInfo->instrument_file), &pszToken);
986 }
987 else if (strcasecmp(pszToken, "INSTRUMENT_NR") == 0) {
988 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
989 if (pszToken)
990 pChannelInfo->instrument_nr = atoi(lscp_ltrim(pszToken));
991 }
992 else if (strcasecmp(pszToken, "INSTRUMENT_STATUS") == 0) {
993 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
994 if (pszToken)
995 pChannelInfo->instrument_status = atoi(lscp_ltrim(pszToken));
996 }
997 else if (strcasecmp(pszToken, "MIDI_INPUT_DEVICE") == 0) {
998 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
999 if (pszToken)
1000 pChannelInfo->midi_device = atoi(lscp_ltrim(pszToken));
1001 }
1002 else if (strcasecmp(pszToken, "MIDI_INPUT_PORT") == 0) {
1003 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
1004 if (pszToken)
1005 pChannelInfo->midi_port = atoi(lscp_ltrim(pszToken));
1006 }
1007 else if (strcasecmp(pszToken, "MIDI_INPUT_CHANNEL") == 0) {
1008 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
1009 if (pszToken) {
1010 pszToken = lscp_ltrim(pszToken);
1011 if (strcasecmp(pszToken, "ALL") == 0)
1012 pChannelInfo->midi_channel = LSCP_MIDI_CHANNEL_ALL;
1013 else
1014 pChannelInfo->midi_channel = atoi(pszToken);
1015 }
1016 }
1017 else if (strcasecmp(pszToken, "VOLUME") == 0) {
1018 pszToken = lscp_strtok(NULL, pszCrlf, &(pch));
1019 if (pszToken)
1020 pChannelInfo->volume = (float) atof(lscp_ltrim(pszToken));
1021 }
1022 pszToken = lscp_strtok(NULL, pszSeps, &(pch));
1023 }
1024 }
1025 else pChannelInfo = NULL;
1026
1027 // Unlock this section up.
1028 lscp_mutex_unlock(pClient->mutex);
1029
1030 return pChannelInfo;
1031 }
1032
1033
1034 /**
1035 * Current number of active voices:
1036 * GET CHANNEL VOICE_COUNT <sampler-channel>
1037 *
1038 * @param pClient Pointer to client instance structure.
1039 * @param iSamplerChannel Sampler channel number.
1040 *
1041 * @returns The number of voices currently active, -1 in case of failure.
1042 */
1043 int lscp_get_channel_voice_count ( lscp_client_t *pClient, int iSamplerChannel )
1044 {
1045 char szQuery[LSCP_BUFSIZ];
1046 int iVoiceCount = -1;
1047
1048 if (iSamplerChannel < 0)
1049 return iVoiceCount;
1050
1051 // Lock this section up.
1052 lscp_mutex_lock(pClient->mutex);
1053
1054 sprintf(szQuery, "GET CHANNEL VOICE_COUNT %d\r\n", iSamplerChannel);
1055 if (lscp_client_call(pClient, szQuery) == LSCP_OK)
1056 iVoiceCount = atoi(lscp_client_get_result(pClient));
1057
1058 // Unlock this section down.
1059 lscp_mutex_unlock(pClient->mutex);
1060
1061 return iVoiceCount;
1062 }
1063
1064
1065 /**
1066 * Current number of active disk streams:
1067 * GET CHANNEL STREAM_COUNT <sampler-channel>
1068 *
1069 * @param pClient Pointer to client instance structure.
1070 * @param iSamplerChannel Sampler channel number.
1071 *
1072 * @returns The number of active disk streams on success, -1 otherwise.
1073 */
1074 int lscp_get_channel_stream_count ( lscp_client_t *pClient, int iSamplerChannel )
1075 {
1076 char szQuery[LSCP_BUFSIZ];
1077 int iStreamCount = -1;
1078
1079 if (iSamplerChannel < 0)
1080 return iStreamCount;
1081
1082 // Lock this section up.
1083 lscp_mutex_lock(pClient->mutex);
1084
1085 sprintf(szQuery, "GET CHANNEL STREAM_COUNT %d\r\n", iSamplerChannel);
1086 if (lscp_client_call(pClient, szQuery) == LSCP_OK)
1087 iStreamCount = atoi(lscp_client_get_result(pClient));
1088
1089 // Unlock this section down.
1090 lscp_mutex_unlock(pClient->mutex);
1091
1092 return iStreamCount;
1093 }
1094
1095
1096 /**
1097 * Current least usage of active disk streams.
1098 *
1099 * @param pClient Pointer to client instance structure.
1100 * @param iSamplerChannel Sampler channel number.
1101 *
1102 * @returns The usage percentage of the least filled active disk stream
1103 * on success, -1 otherwise.
1104 */
1105 int lscp_get_channel_stream_usage ( lscp_client_t *pClient, int iSamplerChannel )
1106 {
1107 char szQuery[LSCP_BUFSIZ];
1108 int iStreamUsage = -1;
1109 const char *pszResult;
1110 const char *pszSeps = "[]%,";
1111 char *pszToken;
1112 char *pch;
1113 int iStream;
1114 int iPercent;
1115
1116 if (iSamplerChannel < 0)
1117 return iStreamUsage;
1118
1119 // Lock this section up.
1120 lscp_mutex_lock(pClient->mutex);
1121
1122 iStream = 0;
1123 sprintf(szQuery, "GET CHANNEL BUFFER_FILL PERCENTAGE %d\r\n", iSamplerChannel);
1124 if (lscp_client_call(pClient, szQuery) == LSCP_OK) {
1125 pszResult = lscp_client_get_result(pClient);
1126 pszToken = lscp_strtok((char *) pszResult, pszSeps, &(pch));
1127 while (pszToken) {
1128 if (*pszToken) {
1129 // Skip stream id.
1130 pszToken = lscp_strtok(NULL, pszSeps, &(pch));
1131 if (pszToken == NULL)
1132 break;
1133 // Get least buffer fill percentage.
1134 iPercent = atol(pszToken);
1135 if (iStreamUsage > iPercent || iStream == 0)
1136 iStreamUsage = iPercent;
1137 iStream++;
1138 }
1139 pszToken = lscp_strtok(NULL, pszSeps, &(pch));
1140 }
1141 }
1142
1143 // Unlock this section down.
1144 lscp_mutex_unlock(pClient->mutex);
1145
1146 return iStreamUsage;
1147 }
1148
1149
1150 /**
1151 * Current fill state of disk stream buffers:
1152 * GET CHANNEL BUFFER_FILL {BYTES|PERCENTAGE} <sampler-channel>
1153 *
1154 * @param pClient Pointer to client instance structure.
1155 * @param usage_type Usage type to be returned, either
1156 * @ref LSCP_USAGE_BYTES, or
1157 * @ref LSCP_USAGE_PERCENTAGE.
1158 * @param iSamplerChannel Sampler channel number.
1159 *
1160 * @returns A pointer to a @ref lscp_buffer_fill_t structure, with the
1161 * information of the current disk stream buffer fill usage, for the given
1162 * sampler channel, or NULL in case of failure.
1163 */
1164 lscp_buffer_fill_t *lscp_get_channel_buffer_fill ( lscp_client_t *pClient, lscp_usage_t usage_type, int iSamplerChannel )
1165 {
1166 lscp_buffer_fill_t *pBufferFill;
1167 char szQuery[LSCP_BUFSIZ];
1168 int iStreamCount;
1169 const char *pszUsageType = (usage_type == LSCP_USAGE_BYTES ? "BYTES" : "PERCENTAGE");
1170 const char *pszResult;
1171 const char *pszSeps = "[]%,";
1172 char *pszToken;
1173 char *pch;
1174 int iStream;
1175
1176 // Retrieve a channel stream estimation.
1177 iStreamCount = lscp_get_channel_stream_count(pClient, iSamplerChannel);
1178 if (pClient->iStreamCount < 0)
1179 return NULL;
1180
1181 // Lock this section up.
1182 lscp_mutex_lock(pClient->mutex);
1183
1184 // Check if we need to reallocate the stream usage array.
1185 if (pClient->iStreamCount != iStreamCount) {
1186 if (pClient->buffer_fill)
1187 free(pClient->buffer_fill);
1188 if (iStreamCount > 0)
1189 pClient->buffer_fill = (lscp_buffer_fill_t *) malloc(iStreamCount * sizeof(lscp_buffer_fill_t));
1190 else
1191 pClient->buffer_fill = NULL;
1192 pClient->iStreamCount = iStreamCount;
1193 }
1194
1195 // Get buffer fill usage...
1196 pBufferFill = pClient->buffer_fill;
1197 if (pBufferFill && iStreamCount > 0) {
1198 iStream = 0;
1199 pBufferFill = pClient->buffer_fill;
1200 sprintf(szQuery, "GET CHANNEL BUFFER_FILL %s %d\r\n", pszUsageType, iSamplerChannel);
1201 if (lscp_client_call(pClient, szQuery) == LSCP_OK) {
1202 pszResult = lscp_client_get_result(pClient);
1203 pszToken = lscp_strtok((char *) pszResult, pszSeps, &(pch));
1204 while (pszToken && iStream < pClient->iStreamCount) {
1205 if (*pszToken) {
1206 pBufferFill[iStream].stream_id = atol(pszToken);
1207 pszToken = lscp_strtok(NULL, pszSeps, &(pch));
1208 if (pszToken == NULL)
1209 break;
1210 pBufferFill[iStream].stream_usage = atol(pszToken);
1211 iStream++;
1212 }
1213 pszToken = lscp_strtok(NULL, pszSeps, &(pch));
1214 }
1215 } // Reset the usage, whatever it was before.
1216 else while (iStream < pClient->iStreamCount)
1217 pBufferFill[iStream++].stream_usage = 0;
1218 }
1219
1220 // Unlock this section down.
1221 lscp_mutex_unlock(pClient->mutex);
1222
1223 return pBufferFill;
1224 }
1225
1226
1227 /**
1228 * Setting audio output type:
1229 * SET CHANNEL AUDIO_OUTPUT_TYPE <sampler-channel> <audio-output-type>
1230 *
1231 * @param pClient Pointer to client instance structure.
1232 * @param iSamplerChannel Sampler channel number.
1233 * @param pszAudioDriver Audio output driver type (e.g. "ALSA" or "JACK").
1234 */
1235 lscp_status_t lscp_set_channel_audio_type ( lscp_client_t *pClient, int iSamplerChannel, const char *pszAudioDriver )
1236 {
1237 char szQuery[LSCP_BUFSIZ];
1238
1239 if (iSamplerChannel < 0 || pszAudioDriver == NULL)
1240 return LSCP_FAILED;
1241
1242 sprintf(szQuery, "SET CHANNEL AUDIO_OUTPUT_TYPE %d %s\r\n", iSamplerChannel, pszAudioDriver);
1243 return lscp_client_query(pClient, szQuery);
1244 }
1245
1246
1247 /**
1248 * Setting audio output device:
1249 * SET CHANNEL AUDIO_OUTPUT_DEVICE <sampler-channel> <device-id>
1250 *
1251 * @param pClient Pointer to client instance structure.
1252 * @param iSamplerChannel Sampler channel number.
1253 * @param iAudioDevice Audio output device number identifier.
1254 */
1255 lscp_status_t lscp_set_channel_audio_device ( lscp_client_t *pClient, int iSamplerChannel, int iAudioDevice )
1256 {
1257 char szQuery[LSCP_BUFSIZ];
1258
1259 if (iSamplerChannel < 0 || iAudioDevice < 0)
1260 return LSCP_FAILED;
1261
1262 sprintf(szQuery, "SET CHANNEL AUDIO_OUTPUT_DEVICE %d %d\r\n", iSamplerChannel, iAudioDevice);
1263 return lscp_client_query(pClient, szQuery);
1264 }
1265
1266
1267 /**
1268 * Setting audio output channel:
1269 * SET CHANNEL AUDIO_OUTPUT_CHANNEL <sampler-channel> <audio-output-chan> <audio-input-chan>
1270 *
1271 * @param pClient Pointer to client instance structure.
1272 * @param iSamplerChannel Sampler channel number.
1273 * @param iAudioOut Audio output device channel to be routed from.
1274 * @param iAudioIn Audio output device channel to be routed into.
1275 *
1276 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
1277 */
1278 lscp_status_t lscp_set_channel_audio_channel ( lscp_client_t *pClient, int iSamplerChannel, int iAudioOut, int iAudioIn )
1279 {
1280 char szQuery[LSCP_BUFSIZ];
1281
1282 if (iSamplerChannel < 0 || iAudioOut < 0 || iAudioIn < 0)
1283 return LSCP_FAILED;
1284
1285 sprintf(szQuery, "SET CHANNEL AUDIO_OUTPUT_CHANNEL %d %d %d\r\n", iSamplerChannel, iAudioOut, iAudioIn);
1286 return lscp_client_query(pClient, szQuery);
1287 }
1288
1289
1290 /**
1291 * Setting MIDI input type:
1292 * SET CHANNEL MIDI_INPUT_TYPE <sampler-channel> <midi-input-type>
1293 *
1294 * @param pClient Pointer to client instance structure.
1295 * @param iSamplerChannel Sampler channel number.
1296 * @param pszMidiDriver MIDI input driver type (e.g. "ALSA").
1297 *
1298 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
1299 */
1300 lscp_status_t lscp_set_channel_midi_type ( lscp_client_t *pClient, int iSamplerChannel, const char *pszMidiDriver )
1301 {
1302 char szQuery[LSCP_BUFSIZ];
1303
1304 if (iSamplerChannel < 0 || pszMidiDriver == NULL)
1305 return LSCP_FAILED;
1306
1307 sprintf(szQuery, "SET CHANNEL MIDI_INPUT_TYPE %d %s\r\n", iSamplerChannel, pszMidiDriver);
1308 return lscp_client_query(pClient, szQuery);
1309 }
1310
1311
1312 /**
1313 * Setting MIDI input device:
1314 * SET CHANNEL MIDI_INPUT_DEVICE <sampler-channel> <device-id>
1315 *
1316 * @param pClient Pointer to client instance structure.
1317 * @param iSamplerChannel Sampler channel number.
1318 * @param iMidiDevice MIDI input device number identifier.
1319 */
1320 lscp_status_t lscp_set_channel_midi_device ( lscp_client_t *pClient, int iSamplerChannel, int iMidiDevice )
1321 {
1322 char szQuery[LSCP_BUFSIZ];
1323
1324 if (iSamplerChannel < 0 || iMidiDevice < 0)
1325 return LSCP_FAILED;
1326
1327 sprintf(szQuery, "SET CHANNEL MIDI_INPUT_DEVICE %d %d\r\n", iSamplerChannel, iMidiDevice);
1328 return lscp_client_query(pClient, szQuery);
1329 }
1330
1331
1332 /**
1333 * Setting MIDI input port:
1334 * SET CHANNEL MIDI_INPUT_PORT <sampler-channel> <midi-input-port>
1335 *
1336 * @param pClient Pointer to client instance structure.
1337 * @param iSamplerChannel Sampler channel number.
1338 * @param iMidiPort MIDI input driver virtual port number.
1339 *
1340 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
1341 */
1342 lscp_status_t lscp_set_channel_midi_port ( lscp_client_t *pClient, int iSamplerChannel, int iMidiPort )
1343 {
1344 char szQuery[LSCP_BUFSIZ];
1345
1346 if (iSamplerChannel < 0 || iMidiPort < 0)
1347 return LSCP_FAILED;
1348
1349 sprintf(szQuery, "SET CHANNEL MIDI_INPUT_PORT %d %d\r\n", iSamplerChannel, iMidiPort);
1350 return lscp_client_query(pClient, szQuery);
1351 }
1352
1353
1354 /**
1355 * Setting MIDI input channel:
1356 * SET CHANNEL MIDI_INPUT_CHANNEL <sampler-channel> <midi-input-chan>
1357 *
1358 * @param pClient Pointer to client instance structure.
1359 * @param iSamplerChannel Sampler channel number.
1360 * @param iMidiChannel MIDI channel address number to listen (0-15) or
1361 * LSCP_MIDI_CHANNEL_ALL (16) to listen on all channels.
1362 *
1363 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
1364 */
1365 lscp_status_t lscp_set_channel_midi_channel ( lscp_client_t *pClient, int iSamplerChannel, int iMidiChannel )
1366 {
1367 char szQuery[LSCP_BUFSIZ];
1368
1369 if (iSamplerChannel < 0 || iMidiChannel < 0 || iMidiChannel > 16)
1370 return LSCP_FAILED;
1371
1372 if (iMidiChannel == LSCP_MIDI_CHANNEL_ALL)
1373 sprintf(szQuery, "SET CHANNEL MIDI_INPUT_CHANNEL %d ALL\r\n", iSamplerChannel);
1374 else
1375 sprintf(szQuery, "SET CHANNEL MIDI_INPUT_CHANNEL %d %d\r\n", iSamplerChannel, iMidiChannel);
1376 return lscp_client_query(pClient, szQuery);
1377 }
1378
1379
1380 /**
1381 * Setting channel volume:
1382 * SET CHANNEL VOLUME <sampler-channel> <volume>
1383 *
1384 * @param pClient Pointer to client instance structure.
1385 * @param iSamplerChannel Sampler channel number.
1386 * @param fVolume Sampler channel volume as a positive floating point
1387 * number, where a value less than 1.0 for attenuation,
1388 * and greater than 1.0 for amplification.
1389 *
1390 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
1391 */
1392 lscp_status_t lscp_set_channel_volume ( lscp_client_t *pClient, int iSamplerChannel, float fVolume )
1393 {
1394 char szQuery[LSCP_BUFSIZ];
1395
1396 if (iSamplerChannel < 0 || fVolume < 0.0)
1397 return LSCP_FAILED;
1398
1399 sprintf(szQuery, "SET CHANNEL VOLUME %d %g\r\n", iSamplerChannel, fVolume);
1400 return lscp_client_query(pClient, szQuery);
1401 }
1402
1403
1404 /**
1405 * Resetting a sampler channel:
1406 * RESET CHANNEL <sampler-channel>
1407 *
1408 * @param pClient Pointer to client instance structure.
1409 * @param iSamplerChannel Sampler channel number.
1410 *
1411 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
1412 */
1413 lscp_status_t lscp_reset_channel ( lscp_client_t *pClient, int iSamplerChannel )
1414 {
1415 char szQuery[LSCP_BUFSIZ];
1416
1417 if (iSamplerChannel < 0)
1418 return LSCP_FAILED;
1419
1420 sprintf(szQuery, "RESET CHANNEL %d\r\n", iSamplerChannel);
1421 return lscp_client_query(pClient, szQuery);
1422 }
1423
1424
1425 /**
1426 * Resetting the sampler:
1427 * RESET
1428 *
1429 * @param pClient Pointer to client instance structure.
1430 *
1431 * @returns LSCP_OK on success, LSCP_FAILED otherwise.
1432 */
1433 lscp_status_t lscp_reset_sampler ( lscp_client_t *pClient )
1434 {
1435 return lscp_client_query(pClient, "RESET\r\n");
1436 }
1437
1438
1439 // end of client.c

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