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with the latest LS release (0.4.0) we also have a new LSCP spec release (1.1) now
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| 124 | <body> |
| 125 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 126 | <table summary="layout" width="66%" border="0" cellpadding="0" cellspacing="0"><tr><td><table summary="layout" width="100%" border="0" cellpadding="2" cellspacing="1"> |
| 127 | <tr><td class="header">LinuxSampler Developers</td><td class="header">C. Schoenebeck</td></tr> |
| 128 | <tr><td class="header">Internet-Draft</td><td class="header">Interessengemeinschaft Software</td></tr> |
| 129 | <tr><td class="header">Expires: May 29, 2007</td><td class="header">Engineering e. V.</td></tr> |
| 130 | <tr><td class="header"> </td><td class="header">November 25, 2006</td></tr> |
| 131 | </table></td></tr></table> |
| 132 | <div align="right"><span class="title"><br />LinuxSampler Control Protocol</span></div> |
| 133 | <div align="right"><span class="title"><br />LSCP 1.1</span></div> |
| 134 | |
| 135 | <h3>Status of this Memo</h3> |
| 136 | <p> |
| 137 | This document is an Internet-Draft and is |
| 138 | in full conformance with all provisions of Section 10 of RFC 2026.</p> |
| 139 | <p> |
| 140 | Internet-Drafts are working documents of the Internet Engineering |
| 141 | Task Force (IETF), its areas, and its working groups. |
| 142 | Note that other groups may also distribute working documents as |
| 143 | Internet-Drafts.</p> |
| 144 | <p> |
| 145 | Internet-Drafts are draft documents valid for a maximum of six months |
| 146 | and may be updated, replaced, or obsoleted by other documents at any time. |
| 147 | It is inappropriate to use Internet-Drafts as reference material or to cite |
| 148 | them other than as “work in progress.”</p> |
| 149 | <p> |
| 150 | The list of current Internet-Drafts can be accessed at |
| 151 | <a href='http://www.ietf.org/ietf/1id-abstracts.txt'>http://www.ietf.org/ietf/1id-abstracts.txt</a>.</p> |
| 152 | <p> |
| 153 | The list of Internet-Draft Shadow Directories can be accessed at |
| 154 | <a href='http://www.ietf.org/shadow.html'>http://www.ietf.org/shadow.html</a>.</p> |
| 155 | <p> |
| 156 | This Internet-Draft will expire on May 29, 2007.</p> |
| 157 | |
| 158 | <h3>Copyright Notice</h3> |
| 159 | <p> |
| 160 | Copyright © The Internet Society (2006). All Rights Reserved.</p> |
| 161 | |
| 162 | <h3>Abstract</h3> |
| 163 | |
| 164 | <p>The LinuxSampler Control Protocol (LSCP) is an |
| 165 | application-level protocol primarily intended for local and |
| 166 | remote controlling the LinuxSampler backend application, which is a |
| 167 | sophisticated server-like console application essentially playing |
| 168 | back audio samples and manipulating the samples in real time to |
| 169 | certain extent. |
| 170 | </p><a name="toc"></a><br /><hr /> |
| 171 | <h3>Table of Contents</h3> |
| 172 | <p class="toc"> |
| 173 | <a href="#anchor1">1.</a> |
| 174 | Requirements notation<br /> |
| 175 | <a href="#LSCP versioning">2.</a> |
| 176 | Versioning of this specification<br /> |
| 177 | <a href="#anchor2">3.</a> |
| 178 | Introduction<br /> |
| 179 | <a href="#anchor3">4.</a> |
| 180 | Focus of this protocol<br /> |
| 181 | <a href="#anchor4">5.</a> |
| 182 | Communication Overview<br /> |
| 183 | <a href="#anchor5">5.1.</a> |
| 184 | Request/response communication method<br /> |
| 185 | <a href="#anchor6">5.1.1.</a> |
| 186 | Result format<br /> |
| 187 | <a href="#anchor7">5.2.</a> |
| 188 | Subscribe/notify communication method<br /> |
| 189 | <a href="#control_commands">6.</a> |
| 190 | Description for control commands<br /> |
| 191 | <a href="#anchor8">6.1.</a> |
| 192 | Ignored lines and comments<br /> |
| 193 | <a href="#anchor9">6.2.</a> |
| 194 | Configuring audio drivers<br /> |
| 195 | <a href="#GET AVAILABLE_AUDIO_OUTPUT_DRIVERS">6.2.1.</a> |
| 196 | Getting amount of available audio output drivers<br /> |
| 197 | <a href="#LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS">6.2.2.</a> |
| 198 | Getting all available audio output drivers<br /> |
| 199 | <a href="#GET AUDIO_OUTPUT_DRIVER INFO">6.2.3.</a> |
| 200 | Getting information about a specific audio |
| 201 | output driver<br /> |
| 202 | <a href="#GET AUDIO_OUTPUT_DRIVER_PARAMETER INFO">6.2.4.</a> |
| 203 | Getting information about specific audio |
| 204 | output driver parameter<br /> |
| 205 | <a href="#CREATE AUDIO_OUTPUT_DEVICE">6.2.5.</a> |
| 206 | Creating an audio output device<br /> |
| 207 | <a href="#DESTROY AUDIO_OUTPUT_DEVICE">6.2.6.</a> |
| 208 | Destroying an audio output device<br /> |
| 209 | <a href="#GET AUDIO_OUTPUT_DEVICES">6.2.7.</a> |
| 210 | Getting all created audio output device count<br /> |
| 211 | <a href="#LIST AUDIO_OUTPUT_DEVICES">6.2.8.</a> |
| 212 | Getting all created audio output device list<br /> |
| 213 | <a href="#GET AUDIO_OUTPUT_DEVICE INFO">6.2.9.</a> |
| 214 | Getting current settings of an audio output device<br /> |
| 215 | <a href="#SET AUDIO_OUTPUT_DEVICE_PARAMETER">6.2.10.</a> |
| 216 | Changing settings of audio output devices<br /> |
| 217 | <a href="#GET AUDIO_OUTPUT_CHANNEL INFO">6.2.11.</a> |
| 218 | Getting information about an audio channel<br /> |
| 219 | <a href="#GET AUDIO_OUTPUT_CHANNEL_PARAMETER INFO">6.2.12.</a> |
| 220 | Getting information about specific audio channel parameter<br /> |
| 221 | <a href="#SET AUDIO_OUTPUT_CHANNEL_PARAMETER">6.2.13.</a> |
| 222 | Changing settings of audio output channels<br /> |
| 223 | <a href="#anchor10">6.3.</a> |
| 224 | Configuring MIDI input drivers<br /> |
| 225 | <a href="#GET AVAILABLE_MIDI_INPUT_DRIVERS">6.3.1.</a> |
| 226 | Getting amount of available MIDI input drivers<br /> |
| 227 | <a href="#LIST AVAILABLE_MIDI_INPUT_DRIVERS">6.3.2.</a> |
| 228 | Getting all available MIDI input drivers<br /> |
| 229 | <a href="#GET MIDI_INPUT_DRIVER INFO">6.3.3.</a> |
| 230 | Getting information about a specific MIDI input driver<br /> |
| 231 | <a href="#GET MIDI_INPUT_DRIVER_PARAMETER INFO">6.3.4.</a> |
| 232 | Getting information about specific MIDI input driver parameter<br /> |
| 233 | <a href="#CREATE MIDI_INPUT_DEVICE">6.3.5.</a> |
| 234 | Creating a MIDI input device<br /> |
| 235 | <a href="#DESTROY MIDI_INPUT_DEVICE">6.3.6.</a> |
| 236 | Destroying a MIDI input device<br /> |
| 237 | <a href="#GET MIDI_INPUT_DEVICES">6.3.7.</a> |
| 238 | Getting all created MIDI input device count<br /> |
| 239 | <a href="#LIST MIDI_INPUT_DEVICES">6.3.8.</a> |
| 240 | Getting all created MIDI input device list<br /> |
| 241 | <a href="#GET MIDI_INPUT_DEVICE INFO">6.3.9.</a> |
| 242 | Getting current settings of a MIDI input device<br /> |
| 243 | <a href="#SET MIDI_INPUT_DEVICE_PARAMETER">6.3.10.</a> |
| 244 | Changing settings of MIDI input devices<br /> |
| 245 | <a href="#GET MIDI_INPUT_PORT INFO">6.3.11.</a> |
| 246 | Getting information about a MIDI port<br /> |
| 247 | <a href="#GET MIDI_INPUT_PORT_PARAMETER INFO">6.3.12.</a> |
| 248 | Getting information about specific MIDI port parameter<br /> |
| 249 | <a href="#SET MIDI_INPUT_PORT_PARAMETER">6.3.13.</a> |
| 250 | Changing settings of MIDI input ports<br /> |
| 251 | <a href="#anchor11">6.4.</a> |
| 252 | Configuring sampler channels<br /> |
| 253 | <a href="#LOAD INSTRUMENT">6.4.1.</a> |
| 254 | Loading an instrument<br /> |
| 255 | <a href="#LOAD ENGINE">6.4.2.</a> |
| 256 | Loading a sampler engine<br /> |
| 257 | <a href="#GET CHANNELS">6.4.3.</a> |
| 258 | Getting all created sampler channel count<br /> |
| 259 | <a href="#LIST CHANNELS">6.4.4.</a> |
| 260 | Getting all created sampler channel list<br /> |
| 261 | <a href="#ADD CHANNEL">6.4.5.</a> |
| 262 | Adding a new sampler channel<br /> |
| 263 | <a href="#REMOVE CHANNEL">6.4.6.</a> |
| 264 | Removing a sampler channel<br /> |
| 265 | <a href="#GET AVAILABLE_ENGINES">6.4.7.</a> |
| 266 | Getting amount of available engines<br /> |
| 267 | <a href="#LIST AVAILABLE_ENGINES">6.4.8.</a> |
| 268 | Getting all available engines<br /> |
| 269 | <a href="#GET ENGINE INFO">6.4.9.</a> |
| 270 | Getting information about an engine<br /> |
| 271 | <a href="#GET CHANNEL INFO">6.4.10.</a> |
| 272 | Getting sampler channel information<br /> |
| 273 | <a href="#GET CHANNEL VOICE_COUNT">6.4.11.</a> |
| 274 | Current number of active voices<br /> |
| 275 | <a href="#GET CHANNEL STREAM_COUNT">6.4.12.</a> |
| 276 | Current number of active disk streams<br /> |
| 277 | <a href="#GET CHANNEL BUFFER_FILL">6.4.13.</a> |
| 278 | Current fill state of disk stream buffers<br /> |
| 279 | <a href="#SET CHANNEL AUDIO_OUTPUT_DEVICE">6.4.14.</a> |
| 280 | Setting audio output device<br /> |
| 281 | <a href="#SET CHANNEL AUDIO_OUTPUT_TYP">6.4.15.</a> |
| 282 | Setting audio output type<br /> |
| 283 | <a href="#SET CHANNEL AUDIO_OUTPUT_CHANNEL">6.4.16.</a> |
| 284 | Setting audio output channel<br /> |
| 285 | <a href="#SET CHANNEL MIDI_INPUT_DEVICE">6.4.17.</a> |
| 286 | Setting MIDI input device<br /> |
| 287 | <a href="#SET CHANNEL MIDI_INPUT_TYPE">6.4.18.</a> |
| 288 | Setting MIDI input type<br /> |
| 289 | <a href="#SET CHANNEL MIDI_INPUT_PORT">6.4.19.</a> |
| 290 | Setting MIDI input port<br /> |
| 291 | <a href="#SET CHANNEL MIDI_INPUT_CHANNEL">6.4.20.</a> |
| 292 | Setting MIDI input channel<br /> |
| 293 | <a href="#SET CHANNEL VOLUME">6.4.21.</a> |
| 294 | Setting channel volume<br /> |
| 295 | <a href="#SET CHANNEL MUTE">6.4.22.</a> |
| 296 | Muting a sampler channel<br /> |
| 297 | <a href="#SET CHANNEL SOLO">6.4.23.</a> |
| 298 | Soloing a sampler channel<br /> |
| 299 | <a href="#RESET CHANNEL">6.4.24.</a> |
| 300 | Resetting a sampler channel<br /> |
| 301 | <a href="#anchor12">6.5.</a> |
| 302 | Controlling connection<br /> |
| 303 | <a href="#SUBSCRIBE">6.5.1.</a> |
| 304 | Register front-end for receiving event messages<br /> |
| 305 | <a href="#UNSUBSCRIBE">6.5.2.</a> |
| 306 | Unregister front-end for not receiving event messages<br /> |
| 307 | <a href="#SET ECHO">6.5.3.</a> |
| 308 | Enable or disable echo of commands<br /> |
| 309 | <a href="#QUIT">6.5.4.</a> |
| 310 | Close client connection<br /> |
| 311 | <a href="#anchor13">6.6.</a> |
| 312 | Global commands<br /> |
| 313 | <a href="#GET TOTAL_VOICE_COUNT">6.6.1.</a> |
| 314 | Current number of active voices<br /> |
| 315 | <a href="#GET TOTAL_VOICE_COUNT_MAX">6.6.2.</a> |
| 316 | Maximum amount of active voices<br /> |
| 317 | <a href="#RESET">6.6.3.</a> |
| 318 | Reset sampler<br /> |
| 319 | <a href="#GET SERVER INFO">6.6.4.</a> |
| 320 | General sampler informations<br /> |
| 321 | <a href="#command_syntax">7.</a> |
| 322 | Command Syntax<br /> |
| 323 | <a href="#events">8.</a> |
| 324 | Events<br /> |
| 325 | <a href="#SUBSCRIBE CHANNEL">8.1.</a> |
| 326 | Number of sampler channels changed<br /> |
| 327 | <a href="#SUBSCRIBE VOICE_COUNT">8.2.</a> |
| 328 | Number of active voices changed<br /> |
| 329 | <a href="#SUBSCRIBE STREAM_COUNT">8.3.</a> |
| 330 | Number of active disk streams changed<br /> |
| 331 | <a href="#SUBSCRIBE BUFFER_FILL">8.4.</a> |
| 332 | Disk stream buffer fill state changed<br /> |
| 333 | <a href="#SUBSCRIBE INFO">8.5.</a> |
| 334 | Channel information changed<br /> |
| 335 | <a href="#SUBSCRIBE TOTAL_VOICE_COUNT">8.6.</a> |
| 336 | Total number of active voices changed<br /> |
| 337 | <a href="#SUBSCRIBE MISCELLANEOUS">8.7.</a> |
| 338 | Miscellaneous and debugging events<br /> |
| 339 | <a href="#anchor14">9.</a> |
| 340 | Security Considerations<br /> |
| 341 | <a href="#anchor15">10.</a> |
| 342 | Acknowledgments<br /> |
| 343 | <a href="#rfc.references1">11.</a> |
| 344 | References<br /> |
| 345 | <a href="#rfc.authors">§</a> |
| 346 | Author's Address<br /> |
| 347 | <a href="#rfc.copyright">§</a> |
| 348 | Intellectual Property and Copyright Statements<br /> |
| 349 | </p> |
| 350 | <br clear="all" /> |
| 351 | |
| 352 | <a name="anchor1"></a><br /><hr /> |
| 353 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 354 | <a name="rfc.section.1"></a><h3>1. Requirements notation</h3> |
| 355 | |
| 356 | <p>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", |
| 357 | "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", |
| 358 | and "OPTIONAL" in this document are to be interpreted as |
| 359 | described in <a class="info" href="#RFC2119">[RFC2119]<span> (</span><span class="info">Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” 1997.</span><span>)</span></a>. |
| 360 | </p> |
| 361 | <p>This protocol is always case-sensitive if not explicitly |
| 362 | claimed the opposite. |
| 363 | </p> |
| 364 | <p>In examples, "C:" and "S:" indicate lines sent by the client |
| 365 | (front-end) and server (LinuxSampler) respectively. Lines in |
| 366 | examples must be interpreted as every line being CRLF |
| 367 | terminated (carriage return character followed by line feed |
| 368 | character as defined in the ASCII standard), thus the following |
| 369 | example: |
| 370 | </p> |
| 371 | <p> |
| 372 | </p> |
| 373 | <blockquote class="text"> |
| 374 | <p>C: "some line" |
| 375 | </p> |
| 376 | <p> "another line" |
| 377 | </p> |
| 378 | </blockquote><p> |
| 379 | |
| 380 | </p> |
| 381 | <p>must actually be interpreted as client sending the following |
| 382 | message: |
| 383 | </p> |
| 384 | <p> |
| 385 | </p> |
| 386 | <blockquote class="text"> |
| 387 | <p>"some line<CR><LF>another |
| 388 | line<CR><LF>" |
| 389 | </p> |
| 390 | </blockquote><p> |
| 391 | |
| 392 | </p> |
| 393 | <p>where <CR> symbolizes the carriage return character and |
| 394 | <LF> the line feed character as defined in the ASCII |
| 395 | standard. |
| 396 | </p> |
| 397 | <p>Due to technical reasons, messages can arbitrary be |
| 398 | fragmented, means the following example: |
| 399 | </p> |
| 400 | <p> |
| 401 | </p> |
| 402 | <blockquote class="text"> |
| 403 | <p>S: "abcd" |
| 404 | </p> |
| 405 | </blockquote><p> |
| 406 | |
| 407 | </p> |
| 408 | <p>could also happen to be sent in three messages like in the |
| 409 | following sequence scenario: |
| 410 | </p> |
| 411 | <p> |
| 412 | </p> |
| 413 | <ul class="text"> |
| 414 | <li>server sending message "a" |
| 415 | </li> |
| 416 | <li>followed by a delay (pause) with |
| 417 | arbitrary duration |
| 418 | </li> |
| 419 | <li>followed by server sending message |
| 420 | "bcd<CR>" |
| 421 | </li> |
| 422 | <li>again followed by a delay (pause) with arbitrary |
| 423 | duration |
| 424 | </li> |
| 425 | <li>followed by server sending the message |
| 426 | "<LF>" |
| 427 | </li> |
| 428 | </ul><p> |
| 429 | |
| 430 | </p> |
| 431 | <p>where again <CR> and <LF> symbolize the carriage |
| 432 | return and line feed characters respectively. |
| 433 | </p> |
| 434 | <a name="LSCP versioning"></a><br /><hr /> |
| 435 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 436 | <a name="rfc.section.2"></a><h3>2. Versioning of this specification</h3> |
| 437 | |
| 438 | <p>LSCP will certainly be extended and enhanced by-and-by. Each official |
| 439 | release of the LSCP specification will be tagged with a unique version |
| 440 | tuple. The version tuple consists at least of a major and minor version |
| 441 | number like: |
| 442 | |
| 443 | </p> |
| 444 | <p> |
| 445 | </p> |
| 446 | <blockquote class="text"> |
| 447 | <p>"1.2" |
| 448 | </p> |
| 449 | </blockquote><p> |
| 450 | |
| 451 | </p> |
| 452 | <p> |
| 453 | In this example the major version number would be "1" and the minor |
| 454 | version number would be "2". Note that the version tuple might also |
| 455 | have more than two elements. The major version number defines a |
| 456 | group of backward compatible versions. That means a frontend is |
| 457 | compatible to the connected sampler if and only if the LSCP versions |
| 458 | to which each of the two parties complies to, match both of the |
| 459 | following rules: |
| 460 | |
| 461 | </p> |
| 462 | <p>Compatibility: |
| 463 | </p> |
| 464 | <p> |
| 465 | </p> |
| 466 | <ol class="text"> |
| 467 | <li>The frontend's LSCP major version and the sampler's LSCP |
| 468 | major version are exactly equal. |
| 469 | </li> |
| 470 | <li>The frontend's LSCP minor version is less or equal than |
| 471 | the sampler's LSCP minor version. |
| 472 | </li> |
| 473 | </ol><p> |
| 474 | |
| 475 | </p> |
| 476 | <p> |
| 477 | Compatibility can only be claimed if both rules are true. |
| 478 | The frontend can use the |
| 479 | <a class="info" href="#GET SERVER INFO">"GET SERVER INFO"<span> (</span><span class="info">General sampler informations</span><span>)</span></a> command to |
| 480 | get the version of the LSCP specification the sampler complies with. |
| 481 | |
| 482 | </p> |
| 483 | <a name="anchor2"></a><br /><hr /> |
| 484 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 485 | <a name="rfc.section.3"></a><h3>3. Introduction</h3> |
| 486 | |
| 487 | <p>LinuxSampler is a so called software sampler application |
| 488 | capable to playback audio samples from a computer's Random |
| 489 | Access Memory (RAM) as well as directly streaming it from disk. |
| 490 | LinuxSampler is designed to be modular. It provides several so |
| 491 | called "sampler engines" where each engine is specialized for a |
| 492 | certain purpose. LinuxSampler has virtual channels which will be |
| 493 | referred in this document as "sampler channels". The channels |
| 494 | are in such way virtual as they can be connected to an |
| 495 | arbitrary MIDI input method and arbitrary MIDI channel (e.g. |
| 496 | sampler channel 17 could be connected to an ALSA sequencer |
| 497 | device 64:0 and listening to MIDI channel 1 there). Each sampler |
| 498 | channel will be associated with an instance of one of the available |
| 499 | sampler engines (e.g. GigEngine, DLSEngine). The audio output of |
| 500 | each sampler channel can be routed to an arbitrary audio output |
| 501 | method (ALSA / JACK) and an arbitrary audio output channel |
| 502 | there. |
| 503 | </p> |
| 504 | <a name="anchor3"></a><br /><hr /> |
| 505 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 506 | <a name="rfc.section.4"></a><h3>4. Focus of this protocol</h3> |
| 507 | |
| 508 | <p>Main focus of this protocol is to provide a way to configure |
| 509 | a running LinuxSampler instance and to retrieve information |
| 510 | about it. The focus of this protocol is not to provide a way to |
| 511 | control synthesis parameters or even to trigger or release |
| 512 | notes. Or in other words; the focus are those functionalities |
| 513 | which are not covered by MIDI or which may at most be handled |
| 514 | via MIDI System Exclusive Messages. |
| 515 | </p> |
| 516 | <a name="anchor4"></a><br /><hr /> |
| 517 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 518 | <a name="rfc.section.5"></a><h3>5. Communication Overview</h3> |
| 519 | |
| 520 | <p>There are two distinct methods of communication between a |
| 521 | running instance of LinuxSampler and one or more control |
| 522 | applications, so called "front-ends": a simple request/response |
| 523 | communication method used by the clients to give commands to the |
| 524 | server as well as to inquire about server's status and a |
| 525 | subscribe/notify communication method used by the client to |
| 526 | subscribe to and receive notifications of certain events as they |
| 527 | happen on the server. The latter needs more effort to be |
| 528 | implemented in the front-end application. The two communication |
| 529 | methods will be described next. |
| 530 | </p> |
| 531 | <a name="anchor5"></a><br /><hr /> |
| 532 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 533 | <a name="rfc.section.5.1"></a><h3>5.1. Request/response communication method</h3> |
| 534 | |
| 535 | <p>This simple communication method is based on |
| 536 | <a class="info" href="#RFC793">TCP<span> (</span><span class="info">Defense Advanced Research Projects Agency, “TRANSMISSION CONTROL PROTOCOL,” 1981.</span><span>)</span></a> [RFC793]. The |
| 537 | front-end application establishes a TCP connection to the |
| 538 | LinuxSampler instance on a certain host system. Then the |
| 539 | front-end application will send certain ASCII based commands |
| 540 | as defined in this document (every command line must be CRLF |
| 541 | terminated - see "Conventions used in this document" at the |
| 542 | beginning of this document) and the LinuxSampler application |
| 543 | will response after a certain process time with an |
| 544 | appropriate ASCII based answer, also as defined in this |
| 545 | document. So this TCP communication is simply based on query |
| 546 | and answer paradigm. That way LinuxSampler is only able to |
| 547 | answer on queries from front-ends, but not able to |
| 548 | automatically send messages to the client if it's not asked |
| 549 | to. The fronted should not reconnect to LinuxSampler for |
| 550 | every single command, instead it should keep the connection |
| 551 | established and simply resend message(s) for subsequent |
| 552 | commands. To keep information in the front-end up-to-date |
| 553 | the front-end has to periodically send new requests to get |
| 554 | the current information from the LinuxSampler instance. This |
| 555 | is often referred to as "polling". While polling is simple |
| 556 | to implement and may be OK to use in some cases, there may |
| 557 | be disadvantages to polling such as network traffic overhead |
| 558 | and information being out of date. |
| 559 | It is possible for a client or several clients to open more |
| 560 | than one connection to the server at the same time. It is |
| 561 | also possible to send more than one request to the server |
| 562 | at the same time but if those requests are sent over the |
| 563 | same connection server MUST execute them sequentially. Upon |
| 564 | executing a request server will produce a result set and |
| 565 | send it to the client. Each and every request made by the |
| 566 | client MUST result in a result set being sent back to the |
| 567 | client. No other data other than a result set may be sent by |
| 568 | a server to a client. No result set may be sent to a client |
| 569 | without the client sending request to the server first. On |
| 570 | any particular connection, result sets MUST be sent in their |
| 571 | entirety without being interrupted by other result sets. If |
| 572 | several requests got queued up at the server they MUST be |
| 573 | processed in the order they were received and result sets |
| 574 | MUST be sent back in the same order. |
| 575 | </p> |
| 576 | <a name="anchor6"></a><br /><hr /> |
| 577 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 578 | <a name="rfc.section.5.1.1"></a><h3>5.1.1. Result format</h3> |
| 579 | |
| 580 | <p>Result set could be one of the following types: |
| 581 | </p> |
| 582 | <p> |
| 583 | </p> |
| 584 | <ol class="text"> |
| 585 | <li>Normal |
| 586 | </li> |
| 587 | <li>Warning |
| 588 | </li> |
| 589 | <li>Error |
| 590 | </li> |
| 591 | </ol><p> |
| 592 | |
| 593 | </p> |
| 594 | <p>Warning and Error result sets MUST be single line and |
| 595 | have the following format: |
| 596 | </p> |
| 597 | <p> |
| 598 | </p> |
| 599 | <ul class="text"> |
| 600 | <li>"WRN:<warning-code>:<warning-message>" |
| 601 | </li> |
| 602 | <li>"ERR:<error-code>:<error-message>" |
| 603 | </li> |
| 604 | </ul><p> |
| 605 | |
| 606 | </p> |
| 607 | <p>Where <warning-code> and <error-code> are |
| 608 | numeric unique identifiers of the warning or error and |
| 609 | <warning-message> and <error-message> are |
| 610 | human readable descriptions of the warning or error |
| 611 | respectively. |
| 612 | </p> |
| 613 | <p>Examples: |
| 614 | </p> |
| 615 | <p> |
| 616 | </p> |
| 617 | <blockquote class="text"> |
| 618 | <p>C: "LOAD INSTRUMENT '/home/me/Boesendorfer24bit.gig" 0 0 |
| 619 | </p> |
| 620 | <p>S: "WRN:32:This is a 24 bit patch which is not supported natively yet." |
| 621 | </p> |
| 622 | </blockquote><p> |
| 623 | |
| 624 | </p> |
| 625 | <p> |
| 626 | </p> |
| 627 | <blockquote class="text"> |
| 628 | <p>C: "GET AUDIO_OUTPUT_DRIVER_PARAMETER INFO ALSA EAR" |
| 629 | </p> |
| 630 | <p>S: "ERR:3456:Audio output driver 'ALSA' does not have a parameter 'EAR'." |
| 631 | </p> |
| 632 | </blockquote><p> |
| 633 | |
| 634 | </p> |
| 635 | <p> |
| 636 | </p> |
| 637 | <blockquote class="text"> |
| 638 | <p>C: "GET AUDIO_OUTPUT_DEVICE INFO 123456" |
| 639 | </p> |
| 640 | <p>S: "ERR:9:There is no audio output device with index 123456." |
| 641 | </p> |
| 642 | </blockquote><p> |
| 643 | |
| 644 | </p> |
| 645 | <p>Normal result sets could be: |
| 646 | </p> |
| 647 | <p> |
| 648 | </p> |
| 649 | <ol class="text"> |
| 650 | <li>Empty |
| 651 | </li> |
| 652 | <li>Single line |
| 653 | </li> |
| 654 | <li>Multi-line |
| 655 | </li> |
| 656 | </ol><p> |
| 657 | |
| 658 | </p> |
| 659 | <p> Empty result set is issued when the server only |
| 660 | needed to acknowledge the fact that the request was |
| 661 | received and it was processed successfully and no |
| 662 | additional information is available. This result set has |
| 663 | the following format: |
| 664 | </p> |
| 665 | <p> |
| 666 | </p> |
| 667 | <blockquote class="text"> |
| 668 | <p>"OK" |
| 669 | </p> |
| 670 | </blockquote><p> |
| 671 | |
| 672 | </p> |
| 673 | <p>Example: |
| 674 | </p> |
| 675 | <p> |
| 676 | </p> |
| 677 | <blockquote class="text"> |
| 678 | <p>C: "SET AUDIO_OUTPUT_DEVICE_PARAMETER 0 CHANNELS=4" |
| 679 | </p> |
| 680 | <p>S: "OK" |
| 681 | </p> |
| 682 | </blockquote><p> |
| 683 | |
| 684 | </p> |
| 685 | <p>Single line result sets are command specific. One |
| 686 | example of a single line result set is an empty line. |
| 687 | Multi-line result sets are command specific and may |
| 688 | include one or more lines of information. They MUST |
| 689 | always end with the following line: |
| 690 | </p> |
| 691 | <p> |
| 692 | </p> |
| 693 | <blockquote class="text"> |
| 694 | <p>"." |
| 695 | </p> |
| 696 | </blockquote><p> |
| 697 | |
| 698 | </p> |
| 699 | <p>Example: |
| 700 | </p> |
| 701 | <p> |
| 702 | </p> |
| 703 | <blockquote class="text"> |
| 704 | <p>C: "GET AUDIO_OUTPUT_DEVICE INFO 0" |
| 705 | </p> |
| 706 | <p>S: "DRIVER: ALSA" |
| 707 | </p> |
| 708 | <p> "CHANNELS: 2" |
| 709 | </p> |
| 710 | <p> "SAMPLERATE: 44100" |
| 711 | </p> |
| 712 | <p> "ACTIVE: true" |
| 713 | </p> |
| 714 | <p> "FRAGMENTS: 2" |
| 715 | </p> |
| 716 | <p> "FRAGMENTSIZE: 128" |
| 717 | </p> |
| 718 | <p> "CARD: '0,0'" |
| 719 | </p> |
| 720 | <p> "." |
| 721 | </p> |
| 722 | </blockquote><p> |
| 723 | |
| 724 | </p> |
| 725 | <p>In addition to above mentioned formats, warnings and |
| 726 | empty result sets MAY be indexed. In this case, they |
| 727 | have the following formats respectively: |
| 728 | </p> |
| 729 | <p> |
| 730 | </p> |
| 731 | <ul class="text"> |
| 732 | <li>"WRN[<index>]:<warning-code>:<warning-message>" |
| 733 | </li> |
| 734 | <li>"OK[<index>]" |
| 735 | </li> |
| 736 | </ul><p> |
| 737 | |
| 738 | </p> |
| 739 | <p>where <index> is command specific and is used |
| 740 | to indicate channel number that the result set was |
| 741 | related to or other integer value. |
| 742 | </p> |
| 743 | <p>Each line of the result set MUST end with |
| 744 | <CRLF>. |
| 745 | </p> |
| 746 | <p>Examples: |
| 747 | </p> |
| 748 | <p> |
| 749 | </p> |
| 750 | <blockquote class="text"> |
| 751 | <p>C: "ADD CHANNEL" |
| 752 | </p> |
| 753 | <p>S: "OK[12]" |
| 754 | </p> |
| 755 | </blockquote><p> |
| 756 | |
| 757 | </p> |
| 758 | <p> |
| 759 | </p> |
| 760 | <blockquote class="text"> |
| 761 | <p>C: "CREATE AUDIO_OUTPUT_DEVICE ALSA SAMPLERATE=96000" |
| 762 | </p> |
| 763 | <p>S: "WRN[0]:32:Sample rate not supported, using 44100 instead." |
| 764 | </p> |
| 765 | </blockquote><p> |
| 766 | |
| 767 | </p> |
| 768 | <a name="anchor7"></a><br /><hr /> |
| 769 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 770 | <a name="rfc.section.5.2"></a><h3>5.2. Subscribe/notify communication method</h3> |
| 771 | |
| 772 | <p>This more sophisticated communication method is actually |
| 773 | only an extension of the simple request/response |
| 774 | communication method. The front-end still uses a TCP |
| 775 | connection and sends the same commands on the TCP |
| 776 | connection. Two extra commands are SUBSCRIBE and UNSUBSCRIBE |
| 777 | commands that allow a client to tell the server that it is |
| 778 | interested in receiving notifications about certain events |
| 779 | as they happen on the server. The SUBSCRIBE command has the |
| 780 | following syntax: |
| 781 | </p> |
| 782 | <p> |
| 783 | </p> |
| 784 | <blockquote class="text"> |
| 785 | <p>SUBSCRIBE <event-id> |
| 786 | </p> |
| 787 | </blockquote><p> |
| 788 | |
| 789 | </p> |
| 790 | <p>where <event-id> will be replaced by the respective |
| 791 | event that client wants to subscribe to. Upon receiving such |
| 792 | request, server SHOULD respond with OK and start sending |
| 793 | EVENT notifications when a given even has occurred to the |
| 794 | front-end when an event has occurred. It MAY be possible |
| 795 | certain events may be sent before OK response during real |
| 796 | time nature of their generation. Event messages have the |
| 797 | following format: |
| 798 | </p> |
| 799 | <p> |
| 800 | </p> |
| 801 | <blockquote class="text"> |
| 802 | <p>NOTIFY:<event-id>:<custom-event-data> |
| 803 | </p> |
| 804 | </blockquote><p> |
| 805 | |
| 806 | </p> |
| 807 | <p>where <event-id> uniquely identifies the event that |
| 808 | has occurred and <custom-event-data> is event |
| 809 | specific. |
| 810 | </p> |
| 811 | <p>Several rules must be followed by the server when |
| 812 | generating events: |
| 813 | </p> |
| 814 | <p> |
| 815 | </p> |
| 816 | <ol class="text"> |
| 817 | <li>Events MUST NOT be sent to any client who has not |
| 818 | issued an appropriate SUBSCRIBE command. |
| 819 | </li> |
| 820 | <li>Events MUST only be sent using the same |
| 821 | connection that was used to subscribe to them. |
| 822 | </li> |
| 823 | <li>When response is being sent to the client, event |
| 824 | MUST be inserted in the stream before or after the |
| 825 | response, but NOT in the middle. Same is true about |
| 826 | the response. It should never be inserted in the |
| 827 | middle of the event message as well as any other |
| 828 | response. |
| 829 | </li> |
| 830 | </ol><p> |
| 831 | |
| 832 | </p> |
| 833 | <p>If the client is not interested in a particular event |
| 834 | anymore it MAY issue UNSUBSCRIBE command using the following |
| 835 | syntax: |
| 836 | </p> |
| 837 | <p> |
| 838 | </p> |
| 839 | <blockquote class="text"> |
| 840 | <p>UNSUBSCRIBE <event-id> |
| 841 | </p> |
| 842 | </blockquote><p> |
| 843 | |
| 844 | </p> |
| 845 | <p>where <event-id> will be replace by the respective |
| 846 | event that client is no longer interested in receiving. For |
| 847 | a list of supported events see <a class="info" href="#events">Section 8<span> (</span><span class="info">Events</span><span>)</span></a>. |
| 848 | </p> |
| 849 | <p>Example: the fill states of disk stream buffers have |
| 850 | changed on sampler channel 4 and the LinuxSampler instance |
| 851 | will react by sending the following message to all clients |
| 852 | who subscribed to this event: |
| 853 | </p> |
| 854 | <p> |
| 855 | </p> |
| 856 | <blockquote class="text"> |
| 857 | <p>NOTIFY:CHANNEL_BUFFER_FILL:4 [35]62%,[33]80%,[37]98% |
| 858 | </p> |
| 859 | </blockquote><p> |
| 860 | |
| 861 | </p> |
| 862 | <p>Which means there are currently three active streams on |
| 863 | sampler channel 4, where the stream with ID "35" is filled |
| 864 | by 62%, stream with ID 33 is filled by 80% and stream with |
| 865 | ID 37 is filled by 98%. |
| 866 | </p> |
| 867 | <p>Clients may choose to open more than one connection to |
| 868 | the server and use some connections to receive notifications |
| 869 | while using other connections to issue commands to the |
| 870 | back-end. This is entirely legal and up to the |
| 871 | implementation. This does not change the protocol in any way |
| 872 | and no special restrictions exist on the server to allow or |
| 873 | disallow this or to track what connections belong to what |
| 874 | front-ends. Server will listen on a single port, accept |
| 875 | multiple connections and support protocol described in this |
| 876 | specification in it's entirety on this single port on each |
| 877 | connection that it accepted. |
| 878 | </p> |
| 879 | <p>Due to the fact that TCP is used for this communication, |
| 880 | dead peers will be detected automatically by the OS TCP |
| 881 | stack. While it may take a while to detect dead peers if no |
| 882 | traffic is being sent from server to client (TCP keep-alive |
| 883 | timer is set to 2 hours on many OSes) it will not be an |
| 884 | issue here as when notifications are sent by the server, |
| 885 | dead client will be detected quickly. |
| 886 | </p> |
| 887 | <p>When connection is closed for any reason server MUST |
| 888 | forget all subscriptions that were made on this connection. |
| 889 | If client reconnects it MUST resubscribe to all events that |
| 890 | it wants to receive. |
| 891 | </p> |
| 892 | <a name="control_commands"></a><br /><hr /> |
| 893 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 894 | <a name="rfc.section.6"></a><h3>6. Description for control commands</h3> |
| 895 | |
| 896 | <p>This chapter will describe the available control commands |
| 897 | that can be sent on the TCP connection in detail. Some certain |
| 898 | commands (e.g. <a class="info" href="#GET CHANNEL INFO">"GET CHANNEL INFO"<span> (</span><span class="info">Getting sampler channel information</span><span>)</span></a> |
| 899 | or <a class="info" href="#GET ENGINE INFO">"GET ENGINE INFO"<span> (</span><span class="info">Getting information about an engine</span><span>)</span></a>) lead to |
| 900 | multiple-line responses. In this case LinuxSampler signals the |
| 901 | end of the response by a "." (single dot) line. |
| 902 | </p> |
| 903 | <a name="anchor8"></a><br /><hr /> |
| 904 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 905 | <a name="rfc.section.6.1"></a><h3>6.1. Ignored lines and comments</h3> |
| 906 | |
| 907 | <p>White lines, that is lines which only contain space and |
| 908 | tabulator characters, and lines that start with a "#" |
| 909 | character are ignored, thus it's possible for example to |
| 910 | group commands and to place comments in a LSCP script |
| 911 | file. |
| 912 | </p> |
| 913 | <a name="anchor9"></a><br /><hr /> |
| 914 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 915 | <a name="rfc.section.6.2"></a><h3>6.2. Configuring audio drivers</h3> |
| 916 | |
| 917 | <p>Instances of drivers in LinuxSampler are called devices. |
| 918 | You can use multiple audio devices simultaneously, e.g. to |
| 919 | output the sound of one sampler channel using the ALSA audio |
| 920 | output driver, and on another sampler channel you might want |
| 921 | to use the JACK audio output driver. For particular audio |
| 922 | output systems it's also possible to create several devices |
| 923 | of the same audio output driver, e.g. two separate ALSA |
| 924 | audio output devices for using two different sound cards at |
| 925 | the same time. This chapter describes all commands to |
| 926 | configure LinuxSampler's audio output devices and their |
| 927 | parameters. |
| 928 | </p> |
| 929 | <p>Instead of defining commands and parameters for each |
| 930 | driver individually, all possible parameters, their meanings |
| 931 | and possible values have to be obtained at runtime. This |
| 932 | makes the protocol a bit abstract, but has the advantage, |
| 933 | that front-ends can be written independently of what drivers |
| 934 | are currently implemented and what parameters these drivers |
| 935 | are actually offering. This means front-ends can even handle |
| 936 | drivers which are implemented somewhere in future without |
| 937 | modifying the front-end at all. |
| 938 | </p> |
| 939 | <p>Note: examples in this chapter showing particular |
| 940 | parameters of drivers are not meant as specification of the |
| 941 | drivers' parameters. Driver implementations in LinuxSampler |
| 942 | might have complete different parameter names and meanings |
| 943 | than shown in these examples or might change in future, so |
| 944 | these examples are only meant for showing how to retrieve |
| 945 | what parameters drivers are offering, how to retrieve their |
| 946 | possible values, etc. |
| 947 | </p> |
| 948 | <a name="GET AVAILABLE_AUDIO_OUTPUT_DRIVERS"></a><br /><hr /> |
| 949 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 950 | <a name="rfc.section.6.2.1"></a><h3>6.2.1. Getting amount of available audio output drivers</h3> |
| 951 | |
| 952 | <p>Use the following command to get the number of |
| 953 | audio output drivers currently available for the |
| 954 | LinuxSampler instance: |
| 955 | </p> |
| 956 | <p> |
| 957 | </p> |
| 958 | <blockquote class="text"> |
| 959 | <p>GET AVAILABLE_AUDIO_OUTPUT_DRIVERS |
| 960 | </p> |
| 961 | </blockquote><p> |
| 962 | |
| 963 | </p> |
| 964 | <p>Possible Answers: |
| 965 | </p> |
| 966 | <p> |
| 967 | </p> |
| 968 | <blockquote class="text"> |
| 969 | <p>LinuxSampler will answer by sending the |
| 970 | number of audio output drivers. |
| 971 | </p> |
| 972 | </blockquote><p> |
| 973 | |
| 974 | </p> |
| 975 | <p>Example: |
| 976 | </p> |
| 977 | <p> |
| 978 | </p> |
| 979 | <blockquote class="text"> |
| 980 | <p>C: "GET AVAILABLE_AUDIO_OUTPUT_DRIVERS" |
| 981 | </p> |
| 982 | <p>S: "2" |
| 983 | </p> |
| 984 | </blockquote><p> |
| 985 | |
| 986 | </p> |
| 987 | <a name="LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS"></a><br /><hr /> |
| 988 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 989 | <a name="rfc.section.6.2.2"></a><h3>6.2.2. Getting all available audio output drivers</h3> |
| 990 | |
| 991 | <p>Use the following command to list all audio output |
| 992 | drivers currently available for the LinuxSampler |
| 993 | instance: |
| 994 | </p> |
| 995 | <p> |
| 996 | </p> |
| 997 | <blockquote class="text"> |
| 998 | <p>LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS |
| 999 | </p> |
| 1000 | </blockquote><p> |
| 1001 | |
| 1002 | </p> |
| 1003 | <p>Possible Answers: |
| 1004 | </p> |
| 1005 | <p> |
| 1006 | </p> |
| 1007 | <blockquote class="text"> |
| 1008 | <p>LinuxSampler will answer by sending comma |
| 1009 | separated character strings, each symbolizing an |
| 1010 | audio output driver. |
| 1011 | </p> |
| 1012 | </blockquote><p> |
| 1013 | |
| 1014 | </p> |
| 1015 | <p>Example: |
| 1016 | </p> |
| 1017 | <p> |
| 1018 | </p> |
| 1019 | <blockquote class="text"> |
| 1020 | <p>C: "LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS" |
| 1021 | </p> |
| 1022 | <p>S: "ALSA,JACK" |
| 1023 | </p> |
| 1024 | </blockquote><p> |
| 1025 | |
| 1026 | </p> |
| 1027 | <a name="GET AUDIO_OUTPUT_DRIVER INFO"></a><br /><hr /> |
| 1028 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1029 | <a name="rfc.section.6.2.3"></a><h3>6.2.3. Getting information about a specific audio |
| 1030 | output driver</h3> |
| 1031 | |
| 1032 | <p>Use the following command to get detailed information |
| 1033 | about a specific audio output driver: |
| 1034 | </p> |
| 1035 | <p> |
| 1036 | </p> |
| 1037 | <blockquote class="text"> |
| 1038 | <p>GET AUDIO_OUTPUT_DRIVER INFO |
| 1039 | <audio-output-driver> |
| 1040 | </p> |
| 1041 | </blockquote><p> |
| 1042 | |
| 1043 | </p> |
| 1044 | <p>Where <audio-output-driver> is the name of the |
| 1045 | audio output driver, returned by the |
| 1046 | <a class="info" href="#LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS">"LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS"<span> (</span><span class="info">Getting all available audio output drivers</span><span>)</span></a> command. |
| 1047 | </p> |
| 1048 | <p>Possible Answers: |
| 1049 | </p> |
| 1050 | <p> |
| 1051 | </p> |
| 1052 | <blockquote class="text"> |
| 1053 | <p>LinuxSampler will answer by sending a |
| 1054 | <CRLF> separated list. Each answer line |
| 1055 | begins with the information category name |
| 1056 | followed by a colon and then a space character |
| 1057 | <SP> and finally the info character string |
| 1058 | to that info category. At the moment the |
| 1059 | following information categories are |
| 1060 | defined: |
| 1061 | </p> |
| 1062 | <p> |
| 1063 | </p> |
| 1064 | <blockquote class="text"> |
| 1065 | <p>DESCRIPTION - |
| 1066 | </p> |
| 1067 | <blockquote class="text"> |
| 1068 | <p> character string describing the |
| 1069 | audio output driver |
| 1070 | </p> |
| 1071 | </blockquote> |
| 1072 | |
| 1073 | |
| 1074 | <p>VERSION - |
| 1075 | </p> |
| 1076 | <blockquote class="text"> |
| 1077 | <p>character string reflecting the |
| 1078 | driver's version |
| 1079 | </p> |
| 1080 | </blockquote> |
| 1081 | |
| 1082 | |
| 1083 | <p>PARAMETERS - |
| 1084 | </p> |
| 1085 | <blockquote class="text"> |
| 1086 | <p>comma separated list of all |
| 1087 | parameters available for the given |
| 1088 | audio output driver, at least |
| 1089 | parameters 'channels', 'samplerate' |
| 1090 | and 'active' are offered by all audio |
| 1091 | output drivers |
| 1092 | </p> |
| 1093 | </blockquote> |
| 1094 | |
| 1095 | |
| 1096 | </blockquote> |
| 1097 | |
| 1098 | |
| 1099 | <p>The mentioned fields above don't have to be |
| 1100 | in particular order. |
| 1101 | </p> |
| 1102 | </blockquote><p> |
| 1103 | |
| 1104 | </p> |
| 1105 | <p>Example: |
| 1106 | </p> |
| 1107 | <p> |
| 1108 | </p> |
| 1109 | <blockquote class="text"> |
| 1110 | <p>C: "GET AUDIO_OUTPUT_DRIVER INFO ALSA" |
| 1111 | </p> |
| 1112 | <p>S: "DESCRIPTION: Advanced Linux Sound |
| 1113 | Architecture" |
| 1114 | </p> |
| 1115 | <p> "VERSION: 1.0" |
| 1116 | </p> |
| 1117 | <p> "PARAMETERS: |
| 1118 | DRIVER,CHANNELS,SAMPLERATE,ACTIVE,FRAGMENTS, |
| 1119 | FRAGMENTSIZE,CARD" |
| 1120 | </p> |
| 1121 | <p> "." |
| 1122 | </p> |
| 1123 | </blockquote><p> |
| 1124 | |
| 1125 | </p> |
| 1126 | <a name="GET AUDIO_OUTPUT_DRIVER_PARAMETER INFO"></a><br /><hr /> |
| 1127 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1128 | <a name="rfc.section.6.2.4"></a><h3>6.2.4. Getting information about specific audio |
| 1129 | output driver parameter</h3> |
| 1130 | |
| 1131 | <p>Use the following command to get detailed information |
| 1132 | about a specific audio output driver parameter: |
| 1133 | </p> |
| 1134 | <p> |
| 1135 | </p> |
| 1136 | <blockquote class="text"> |
| 1137 | <p>GET AUDIO_OUTPUT_DRIVER_PARAMETER INFO <audio> <prm> [<deplist>] |
| 1138 | </p> |
| 1139 | </blockquote><p> |
| 1140 | |
| 1141 | </p> |
| 1142 | <p>Where <audio> is the name of the audio output |
| 1143 | driver as returned by the <a class="info" href="#LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS">"LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS"<span> (</span><span class="info">Getting all available audio output drivers</span><span>)</span></a> command, |
| 1144 | <prm> a specific parameter name for which information should be |
| 1145 | obtained (as returned by the |
| 1146 | <a class="info" href="#GET AUDIO_OUTPUT_DRIVER INFO">"GET AUDIO_OUTPUT_DRIVER INFO"<span> (</span><span class="info">Getting information about a specific audio output driver</span><span>)</span></a> command) and |
| 1147 | <deplist> is an optional list of parameters on which the sought |
| 1148 | parameter <prm> depends on, <deplist> is a list of key-value |
| 1149 | pairs in form of "key1=val1 key2=val2 ...", where character string values |
| 1150 | are encapsulated into apostrophes ('). Arguments given with <deplist> |
| 1151 | which are not dependency parameters of <prm> will be ignored, means |
| 1152 | the front-end application can simply put all parameters into <deplist> |
| 1153 | with the values already selected by the user. |
| 1154 | </p> |
| 1155 | <p>Possible Answers: |
| 1156 | </p> |
| 1157 | <p> |
| 1158 | </p> |
| 1159 | <blockquote class="text"> |
| 1160 | <p>LinuxSampler will answer by sending a |
| 1161 | <CRLF> separated list. |
| 1162 | Each answer line begins with the information category name |
| 1163 | followed by a colon and then a space character <SP> and |
| 1164 | finally |
| 1165 | the info character string to that info category. There are |
| 1166 | information which is always returned, independently of the |
| 1167 | given driver parameter and there are optional information |
| 1168 | which is only shown dependently to given driver parameter. At |
| 1169 | the moment the following information categories are defined: |
| 1170 | </p> |
| 1171 | </blockquote><p> |
| 1172 | |
| 1173 | </p> |
| 1174 | <p> |
| 1175 | </p> |
| 1176 | <blockquote class="text"> |
| 1177 | <p>TYPE - |
| 1178 | </p> |
| 1179 | <blockquote class="text"> |
| 1180 | <p>either "BOOL" for boolean value(s) or |
| 1181 | "INT" for integer |
| 1182 | value(s) or "FLOAT" for dotted number(s) or "STRING" for |
| 1183 | character string(s) |
| 1184 | (always returned, no matter which driver parameter) |
| 1185 | </p> |
| 1186 | </blockquote> |
| 1187 | |
| 1188 | |
| 1189 | <p>DESCRIPTION - |
| 1190 | </p> |
| 1191 | <blockquote class="text"> |
| 1192 | <p>arbitrary text describing the purpose of the parameter |
| 1193 | (always returned, no matter which driver parameter) |
| 1194 | </p> |
| 1195 | </blockquote> |
| 1196 | |
| 1197 | |
| 1198 | <p>MANDATORY - |
| 1199 | </p> |
| 1200 | <blockquote class="text"> |
| 1201 | <p>either true or false, defines if this parameter must be |
| 1202 | given when the device is to be created with the |
| 1203 | <a class="info" href="#CREATE AUDIO_OUTPUT_DEVICE">'CREATE AUDIO_OUTPUT_DEVICE'<span> (</span><span class="info">Creating an audio output device</span><span>)</span></a> |
| 1204 | command (always returned, no matter which driver parameter) |
| 1205 | </p> |
| 1206 | </blockquote> |
| 1207 | |
| 1208 | |
| 1209 | <p>FIX - |
| 1210 | </p> |
| 1211 | <blockquote class="text"> |
| 1212 | <p>either true or false, if false then this parameter can |
| 1213 | be changed at any time, once the device is created by |
| 1214 | the <a class="info" href="#CREATE AUDIO_OUTPUT_DEVICE">'CREATE AUDIO_OUTPUT_DEVICE'<span> (</span><span class="info">Creating an audio output device</span><span>)</span></a> |
| 1215 | command (always returned, no matter which driver parameter) |
| 1216 | </p> |
| 1217 | </blockquote> |
| 1218 | |
| 1219 | |
| 1220 | <p>MULTIPLICITY - |
| 1221 | </p> |
| 1222 | <blockquote class="text"> |
| 1223 | <p>either true or false, defines if this parameter allows |
| 1224 | only one value or a list of values, where true means |
| 1225 | multiple values and false only a single value allowed |
| 1226 | (always returned, no matter which driver parameter) |
| 1227 | </p> |
| 1228 | </blockquote> |
| 1229 | |
| 1230 | |
| 1231 | <p>DEPENDS - |
| 1232 | </p> |
| 1233 | <blockquote class="text"> |
| 1234 | <p>comma separated list of parameters this parameter depends |
| 1235 | on, means the values for fields 'DEFAULT', 'RANGE_MIN', |
| 1236 | 'RANGE_MAX' and 'POSSIBILITIES' might depend on these |
| 1237 | listed parameters, for example assuming that an audio |
| 1238 | driver (like the ALSA driver) offers parameters 'card' |
| 1239 | and 'samplerate' then parameter 'samplerate' would |
| 1240 | depend on 'card' because the possible values for |
| 1241 | 'samplerate' depends on the sound card which can be |
| 1242 | chosen by the 'card' parameter |
| 1243 | (optionally returned, dependent to driver parameter) |
| 1244 | </p> |
| 1245 | </blockquote> |
| 1246 | |
| 1247 | |
| 1248 | <p>DEFAULT - |
| 1249 | </p> |
| 1250 | <blockquote class="text"> |
| 1251 | <p>reflects the default value for this parameter which is |
| 1252 | used when the device is created and not explicitly |
| 1253 | given with the <a class="info" href="#CREATE AUDIO_OUTPUT_DEVICE">'CREATE AUDIO_OUTPUT_DEVICE'<span> (</span><span class="info">Creating an audio output device</span><span>)</span></a> command, |
| 1254 | in case of MULTIPLCITY=true, this is a comma separated |
| 1255 | list, that's why character strings are encapsulated into |
| 1256 | apostrophes (') |
| 1257 | (optionally returned, dependent to driver parameter) |
| 1258 | </p> |
| 1259 | </blockquote> |
| 1260 | |
| 1261 | |
| 1262 | <p>RANGE_MIN - |
| 1263 | </p> |
| 1264 | <blockquote class="text"> |
| 1265 | <p>defines lower limit of the allowed value range for this |
| 1266 | parameter, can be an integer value as well as a dotted |
| 1267 | number, this parameter is often used in conjunction |
| 1268 | with RANGE_MAX, but may also appear without |
| 1269 | (optionally returned, dependent to driver parameter) |
| 1270 | </p> |
| 1271 | </blockquote> |
| 1272 | |
| 1273 | |
| 1274 | <p>RANGE_MAX - |
| 1275 | </p> |
| 1276 | <blockquote class="text"> |
| 1277 | <p>defines upper limit of the allowed value range for this |
| 1278 | parameter, can be an integer value as well as a dotted |
| 1279 | number, this parameter is often used in conjunction with |
| 1280 | RANGE_MIN, but may also appear without |
| 1281 | (optionally returned, dependent to driver parameter) |
| 1282 | </p> |
| 1283 | </blockquote> |
| 1284 | |
| 1285 | |
| 1286 | <p>POSSIBILITIES - |
| 1287 | </p> |
| 1288 | <blockquote class="text"> |
| 1289 | <p>comma separated list of possible values for this |
| 1290 | parameter, character strings are encapsulated into |
| 1291 | apostrophes |
| 1292 | (optionally returned, dependent to driver parameter) |
| 1293 | </p> |
| 1294 | </blockquote> |
| 1295 | |
| 1296 | |
| 1297 | </blockquote><p> |
| 1298 | |
| 1299 | </p> |
| 1300 | <p>The mentioned fields above don't have to be in particular order. |
| 1301 | </p> |
| 1302 | <p>Examples: |
| 1303 | </p> |
| 1304 | <p> |
| 1305 | </p> |
| 1306 | <blockquote class="text"> |
| 1307 | <p>C: "GET AUDIO_OUTPUT_DRIVER_PARAMETER INFO ALSA CARD" |
| 1308 | </p> |
| 1309 | <p>S: "DESCRIPTION: sound card to be used" |
| 1310 | </p> |
| 1311 | <p> "TYPE: STRING" |
| 1312 | </p> |
| 1313 | <p> "MANDATORY: false" |
| 1314 | </p> |
| 1315 | <p> "FIX: true" |
| 1316 | </p> |
| 1317 | <p> "MULTIPLICITY: false" |
| 1318 | </p> |
| 1319 | <p> "DEFAULT: '0,0'" |
| 1320 | </p> |
| 1321 | <p> "POSSIBILITIES: '0,0','1,0','2,0'" |
| 1322 | </p> |
| 1323 | <p> "." |
| 1324 | </p> |
| 1325 | </blockquote><p> |
| 1326 | |
| 1327 | </p> |
| 1328 | <p> |
| 1329 | </p> |
| 1330 | <blockquote class="text"> |
| 1331 | <p>C: "GET AUDIO_OUTPUT_DRIVER_PARAMETER INFO ALSA SAMPLERATE" |
| 1332 | </p> |
| 1333 | <p>S: "DESCRIPTION: output sample rate in Hz" |
| 1334 | </p> |
| 1335 | <p> "TYPE: INT" |
| 1336 | </p> |
| 1337 | <p> "MANDATORY: false" |
| 1338 | </p> |
| 1339 | <p> "FIX: false" |
| 1340 | </p> |
| 1341 | <p> "MULTIPLICITY: false" |
| 1342 | </p> |
| 1343 | <p> "DEPENDS: card" |
| 1344 | </p> |
| 1345 | <p> "DEFAULT: 44100" |
| 1346 | </p> |
| 1347 | <p> "." |
| 1348 | </p> |
| 1349 | </blockquote><p> |
| 1350 | |
| 1351 | </p> |
| 1352 | <p> |
| 1353 | </p> |
| 1354 | <blockquote class="text"> |
| 1355 | <p>C: "GET AUDIO_OUTPUT_DRIVER_PARAMETER INFO ALSA SAMPLERATE CARD='0,0'" |
| 1356 | </p> |
| 1357 | <p>S: "DESCRIPTION: output sample rate in Hz" |
| 1358 | </p> |
| 1359 | <p> "TYPE: INT" |
| 1360 | </p> |
| 1361 | <p> "MANDATORY: false" |
| 1362 | </p> |
| 1363 | <p> "FIX: false" |
| 1364 | </p> |
| 1365 | <p> "MULTIPLICITY: false" |
| 1366 | </p> |
| 1367 | <p> "DEPENDS: card" |
| 1368 | </p> |
| 1369 | <p> "DEFAULT: 44100" |
| 1370 | </p> |
| 1371 | <p> "RANGE_MIN: 22050" |
| 1372 | </p> |
| 1373 | <p> "RANGE_MAX: 96000" |
| 1374 | </p> |
| 1375 | <p> "." |
| 1376 | </p> |
| 1377 | </blockquote><p> |
| 1378 | |
| 1379 | </p> |
| 1380 | <a name="CREATE AUDIO_OUTPUT_DEVICE"></a><br /><hr /> |
| 1381 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1382 | <a name="rfc.section.6.2.5"></a><h3>6.2.5. Creating an audio output device</h3> |
| 1383 | |
| 1384 | <p>Use the following command to create a new audio output device for the desired audio output system: |
| 1385 | </p> |
| 1386 | <p> |
| 1387 | </p> |
| 1388 | <blockquote class="text"> |
| 1389 | <p>CREATE AUDIO_OUTPUT_DEVICE <audio-output-driver> [<param-list>] |
| 1390 | </p> |
| 1391 | </blockquote><p> |
| 1392 | |
| 1393 | </p> |
| 1394 | <p>Where <audio-output-driver> should be replaced by the desired audio |
| 1395 | output system as returned by the |
| 1396 | <a class="info" href="#LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS">"LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS"<span> (</span><span class="info">Getting all available audio output drivers</span><span>)</span></a> |
| 1397 | command and <param-list> by an optional list of driver |
| 1398 | specific parameters in form of "key1=val1 key2=val2 ...", where |
| 1399 | character string values should be encapsulated into apostrophes ('). |
| 1400 | Note that there might be drivers which require parameter(s) to be |
| 1401 | given with this command. Use the previously described commands in |
| 1402 | this chapter to get this information. |
| 1403 | </p> |
| 1404 | <p>Possible Answers: |
| 1405 | </p> |
| 1406 | <p> |
| 1407 | </p> |
| 1408 | <blockquote class="text"> |
| 1409 | <p>"OK[<device-id>]" - |
| 1410 | </p> |
| 1411 | <blockquote class="text"> |
| 1412 | <p>in case the device was successfully created, where |
| 1413 | <device-id> is the numerical ID of the new device |
| 1414 | </p> |
| 1415 | </blockquote> |
| 1416 | |
| 1417 | |
| 1418 | <p>"WRN[<device-id>]:<warning-code>:<warning-message>" - |
| 1419 | </p> |
| 1420 | <blockquote class="text"> |
| 1421 | <p>in case the device was created successfully, where |
| 1422 | <device-id> is the numerical ID of the new device, but there |
| 1423 | are noteworthy issue(s) related (e.g. sound card doesn't |
| 1424 | support given hardware parameters and the driver is using |
| 1425 | fall-back values), providing an appropriate warning code and |
| 1426 | warning message |
| 1427 | </p> |
| 1428 | </blockquote> |
| 1429 | |
| 1430 | |
| 1431 | <p>"ERR:<error-code>:<error-message>" - |
| 1432 | </p> |
| 1433 | <blockquote class="text"> |
| 1434 | <p>in case it failed, providing an appropriate error code and error message |
| 1435 | </p> |
| 1436 | </blockquote> |
| 1437 | |
| 1438 | |
| 1439 | </blockquote><p> |
| 1440 | |
| 1441 | </p> |
| 1442 | <p>Examples: |
| 1443 | </p> |
| 1444 | <p> |
| 1445 | </p> |
| 1446 | <blockquote class="text"> |
| 1447 | <p>C: "CREATE AUDIO_OUTPUT_DEVICE ALSA" |
| 1448 | </p> |
| 1449 | <p>S: "OK[0]" |
| 1450 | </p> |
| 1451 | </blockquote><p> |
| 1452 | |
| 1453 | </p> |
| 1454 | <p> |
| 1455 | </p> |
| 1456 | <blockquote class="text"> |
| 1457 | <p>C: "CREATE AUDIO_OUTPUT_DEVICE ALSA CARD='2,0' SAMPLERATE=96000" |
| 1458 | </p> |
| 1459 | <p>S: "OK[1]" |
| 1460 | </p> |
| 1461 | </blockquote><p> |
| 1462 | |
| 1463 | </p> |
| 1464 | <a name="DESTROY AUDIO_OUTPUT_DEVICE"></a><br /><hr /> |
| 1465 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1466 | <a name="rfc.section.6.2.6"></a><h3>6.2.6. Destroying an audio output device</h3> |
| 1467 | |
| 1468 | <p>Use the following command to destroy a created output device: |
| 1469 | </p> |
| 1470 | <p> |
| 1471 | </p> |
| 1472 | <blockquote class="text"> |
| 1473 | <p>DESTROY AUDIO_OUTPUT_DEVICE <device-id> |
| 1474 | </p> |
| 1475 | </blockquote><p> |
| 1476 | |
| 1477 | </p> |
| 1478 | <p>Where <device-id> should be replaced by the numerical ID of the |
| 1479 | audio output device as given by the |
| 1480 | <a class="info" href="#CREATE AUDIO_OUTPUT_DEVICE">"CREATE AUDIO_OUTPUT_DEVICE"<span> (</span><span class="info">Creating an audio output device</span><span>)</span></a> |
| 1481 | or <a class="info" href="#LIST AUDIO_OUTPUT_DEVICES">"LIST AUDIO_OUTPUT_DEVICES"<span> (</span><span class="info">Getting all created audio output device list</span><span>)</span></a> |
| 1482 | command. |
| 1483 | </p> |
| 1484 | <p>Possible Answers: |
| 1485 | </p> |
| 1486 | <p> |
| 1487 | </p> |
| 1488 | <blockquote class="text"> |
| 1489 | <p>"OK" - |
| 1490 | </p> |
| 1491 | <blockquote class="text"> |
| 1492 | <p>in case the device was successfully destroyed |
| 1493 | </p> |
| 1494 | </blockquote> |
| 1495 | |
| 1496 | |
| 1497 | <p>"WRN:<warning-code>:<warning-message>" - |
| 1498 | </p> |
| 1499 | <blockquote class="text"> |
| 1500 | <p>in case the device was destroyed successfully, but there are |
| 1501 | noteworthy issue(s) related (e.g. an audio over ethernet |
| 1502 | driver was unloaded but the other host might not be |
| 1503 | informed about this situation), providing an appropriate |
| 1504 | warning code and warning message |
| 1505 | </p> |
| 1506 | </blockquote> |
| 1507 | |
| 1508 | |
| 1509 | <p>"ERR:<error-code>:<error-message>" - |
| 1510 | </p> |
| 1511 | <blockquote class="text"> |
| 1512 | <p>in case it failed, providing an appropriate error code and |
| 1513 | error message |
| 1514 | </p> |
| 1515 | </blockquote> |
| 1516 | |
| 1517 | |
| 1518 | </blockquote><p> |
| 1519 | |
| 1520 | </p> |
| 1521 | <p>Example: |
| 1522 | </p> |
| 1523 | <p> |
| 1524 | </p> |
| 1525 | <blockquote class="text"> |
| 1526 | <p>C: "DESTROY AUDIO_OUTPUT_DEVICE 0" |
| 1527 | </p> |
| 1528 | <p>S: "OK" |
| 1529 | </p> |
| 1530 | </blockquote><p> |
| 1531 | |
| 1532 | </p> |
| 1533 | <a name="GET AUDIO_OUTPUT_DEVICES"></a><br /><hr /> |
| 1534 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1535 | <a name="rfc.section.6.2.7"></a><h3>6.2.7. Getting all created audio output device count</h3> |
| 1536 | |
| 1537 | <p>Use the following command to count all created audio output devices: |
| 1538 | </p> |
| 1539 | <p> |
| 1540 | </p> |
| 1541 | <blockquote class="text"> |
| 1542 | <p>GET AUDIO_OUTPUT_DEVICES |
| 1543 | </p> |
| 1544 | </blockquote><p> |
| 1545 | |
| 1546 | </p> |
| 1547 | <p>Possible Answers: |
| 1548 | </p> |
| 1549 | <p> |
| 1550 | </p> |
| 1551 | <blockquote class="text"> |
| 1552 | <p>LinuxSampler will answer by sending the current number of all |
| 1553 | audio output devices. |
| 1554 | </p> |
| 1555 | </blockquote><p> |
| 1556 | |
| 1557 | </p> |
| 1558 | <p>Example: |
| 1559 | </p> |
| 1560 | <p> |
| 1561 | </p> |
| 1562 | <blockquote class="text"> |
| 1563 | <p>C: "GET AUDIO_OUTPUT_DEVICES" |
| 1564 | </p> |
| 1565 | <p>S: "4" |
| 1566 | </p> |
| 1567 | </blockquote><p> |
| 1568 | |
| 1569 | </p> |
| 1570 | <a name="LIST AUDIO_OUTPUT_DEVICES"></a><br /><hr /> |
| 1571 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1572 | <a name="rfc.section.6.2.8"></a><h3>6.2.8. Getting all created audio output device list</h3> |
| 1573 | |
| 1574 | <p>Use the following command to list all created audio output devices: |
| 1575 | </p> |
| 1576 | <p> |
| 1577 | </p> |
| 1578 | <blockquote class="text"> |
| 1579 | <p>LIST AUDIO_OUTPUT_DEVICES |
| 1580 | </p> |
| 1581 | </blockquote><p> |
| 1582 | |
| 1583 | </p> |
| 1584 | <p>Possible Answers: |
| 1585 | </p> |
| 1586 | <p> |
| 1587 | </p> |
| 1588 | <blockquote class="text"> |
| 1589 | <p>LinuxSampler will answer by sending a comma separated list with |
| 1590 | the numerical IDs of all audio output devices. |
| 1591 | </p> |
| 1592 | </blockquote><p> |
| 1593 | |
| 1594 | </p> |
| 1595 | <p>Example: |
| 1596 | </p> |
| 1597 | <p> |
| 1598 | </p> |
| 1599 | <blockquote class="text"> |
| 1600 | <p>C: "LIST AUDIO_OUTPUT_DEVICES" |
| 1601 | </p> |
| 1602 | <p>S: "0,1,4,5" |
| 1603 | </p> |
| 1604 | </blockquote><p> |
| 1605 | |
| 1606 | </p> |
| 1607 | <a name="GET AUDIO_OUTPUT_DEVICE INFO"></a><br /><hr /> |
| 1608 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1609 | <a name="rfc.section.6.2.9"></a><h3>6.2.9. Getting current settings of an audio output device</h3> |
| 1610 | |
| 1611 | <p>Use the following command to get current settings of a specific, created audio output device: |
| 1612 | </p> |
| 1613 | <p> |
| 1614 | </p> |
| 1615 | <blockquote class="text"> |
| 1616 | <p>GET AUDIO_OUTPUT_DEVICE INFO <device-id> |
| 1617 | </p> |
| 1618 | </blockquote><p> |
| 1619 | |
| 1620 | </p> |
| 1621 | <p>Where <device-id> should be replaced by numerical ID |
| 1622 | of the audio output device as e.g. returned by the |
| 1623 | <a class="info" href="#LIST AUDIO_OUTPUT_DEVICES">"LIST AUDIO_OUTPUT_DEVICES"<span> (</span><span class="info">Getting all created audio output device list</span><span>)</span></a> command. |
| 1624 | </p> |
| 1625 | <p>Possible Answers: |
| 1626 | </p> |
| 1627 | <p>LinuxSampler will answer by sending a <CRLF> separated list. |
| 1628 | Each answer line begins with the information category name |
| 1629 | followed by a colon and then a space character <SP> and finally |
| 1630 | the info character string to that info category. As some |
| 1631 | parameters might allow multiple values, character strings are |
| 1632 | encapsulated into apostrophes ('). At the moment the following |
| 1633 | information categories are defined (independently of device): |
| 1634 | </p> |
| 1635 | <p> |
| 1636 | </p> |
| 1637 | <blockquote class="text"> |
| 1638 | <p>DRIVER - |
| 1639 | </p> |
| 1640 | <blockquote class="text"> |
| 1641 | <p>identifier of the used audio output driver, as also |
| 1642 | returned by the |
| 1643 | <a class="info" href="#LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS">"LIST AVAILABLE_AUDIO_OUTPUT_DRIVERS"<span> (</span><span class="info">Getting all available audio output drivers</span><span>)</span></a> |
| 1644 | command |
| 1645 | </p> |
| 1646 | </blockquote> |
| 1647 | |
| 1648 | |
| 1649 | <p>CHANNELS - |
| 1650 | </p> |
| 1651 | <blockquote class="text"> |
| 1652 | <p>amount of audio output channels this device currently |
| 1653 | offers |
| 1654 | </p> |
| 1655 | </blockquote> |
| 1656 | |
| 1657 | |
| 1658 | <p>SAMPLERATE - |
| 1659 | </p> |
| 1660 | <blockquote class="text"> |
| 1661 | <p>playback sample rate the device uses |
| 1662 | </p> |
| 1663 | </blockquote> |
| 1664 | |
| 1665 | |
| 1666 | <p>ACTIVE - |
| 1667 | </p> |
| 1668 | <blockquote class="text"> |
| 1669 | <p>either true or false, if false then the audio device is |
| 1670 | inactive and doesn't output any sound, nor do the |
| 1671 | sampler channels connected to this audio device render |
| 1672 | any audio |
| 1673 | </p> |
| 1674 | </blockquote> |
| 1675 | |
| 1676 | |
| 1677 | </blockquote><p> |
| 1678 | |
| 1679 | </p> |
| 1680 | <p>The mentioned fields above don't have to be in particular |
| 1681 | order. The fields above are only those fields which are |
| 1682 | returned by all audio output devices. Every audio output driver |
| 1683 | might have its own, additional driver specific parameters (see |
| 1684 | <a class="info" href="#GET AUDIO_OUTPUT_DRIVER INFO">Section 6.2.3<span> (</span><span class="info">Getting information about a specific audio output driver</span><span>)</span></a>) |
| 1685 | which are also returned by this command. |
| 1686 | </p> |
| 1687 | <p>Example: |
| 1688 | </p> |
| 1689 | <p> |
| 1690 | </p> |
| 1691 | <blockquote class="text"> |
| 1692 | <p>C: "GET AUDIO_OUTPUT_DEVICE INFO 0" |
| 1693 | </p> |
| 1694 | <p>S: "DRIVER: ALSA" |
| 1695 | </p> |
| 1696 | <p> "CHANNELS: 2" |
| 1697 | </p> |
| 1698 | <p> "SAMPLERATE: 44100" |
| 1699 | </p> |
| 1700 | <p> "ACTIVE: true" |
| 1701 | </p> |
| 1702 | <p> "FRAGMENTS: 2" |
| 1703 | </p> |
| 1704 | <p> "FRAGMENTSIZE: 128" |
| 1705 | </p> |
| 1706 | <p> "CARD: '0,0'" |
| 1707 | </p> |
| 1708 | <p> "." |
| 1709 | </p> |
| 1710 | </blockquote><p> |
| 1711 | |
| 1712 | </p> |
| 1713 | <a name="SET AUDIO_OUTPUT_DEVICE_PARAMETER"></a><br /><hr /> |
| 1714 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1715 | <a name="rfc.section.6.2.10"></a><h3>6.2.10. Changing settings of audio output devices</h3> |
| 1716 | |
| 1717 | <p>Use the following command to alter a specific setting of a created audio output device: |
| 1718 | </p> |
| 1719 | <p> |
| 1720 | </p> |
| 1721 | <blockquote class="text"> |
| 1722 | <p>SET AUDIO_OUTPUT_DEVICE_PARAMETER <device-id> <key>=<value> |
| 1723 | </p> |
| 1724 | </blockquote><p> |
| 1725 | |
| 1726 | </p> |
| 1727 | <p>Where <device-id> should be replaced by the numerical ID of the |
| 1728 | audio output device as given by the |
| 1729 | <a class="info" href="#CREATE AUDIO_OUTPUT_DEVICE">"CREATE AUDIO_OUTPUT_DEVICE"<span> (</span><span class="info">Creating an audio output device</span><span>)</span></a> |
| 1730 | or <a class="info" href="#LIST AUDIO_OUTPUT_DEVICES">"LIST AUDIO_OUTPUT_DEVICES"<span> (</span><span class="info">Getting all created audio output device list</span><span>)</span></a> |
| 1731 | command, <key> by the name of the parameter to change |
| 1732 | and <value> by the new value for this parameter. |
| 1733 | </p> |
| 1734 | <p>Possible Answers: |
| 1735 | </p> |
| 1736 | <p> |
| 1737 | </p> |
| 1738 | <blockquote class="text"> |
| 1739 | <p>"OK" - |
| 1740 | </p> |
| 1741 | <blockquote class="text"> |
| 1742 | <p>in case setting was successfully changed |
| 1743 | </p> |
| 1744 | </blockquote> |
| 1745 | |
| 1746 | |
| 1747 | <p>"WRN:<warning-code>:<warning-message>" - |
| 1748 | </p> |
| 1749 | <blockquote class="text"> |
| 1750 | <p>in case setting was changed successfully, but there are |
| 1751 | noteworthy issue(s) related, providing an appropriate |
| 1752 | warning code and warning message |
| 1753 | </p> |
| 1754 | </blockquote> |
| 1755 | |
| 1756 | |
| 1757 | <p>"ERR:<error-code>:<error-message>" - |
| 1758 | </p> |
| 1759 | <blockquote class="text"> |
| 1760 | <p>in case it failed, providing an appropriate error code and |
| 1761 | error message |
| 1762 | </p> |
| 1763 | </blockquote> |
| 1764 | |
| 1765 | |
| 1766 | </blockquote><p> |
| 1767 | |
| 1768 | </p> |
| 1769 | <p>Example: |
| 1770 | </p> |
| 1771 | <p> |
| 1772 | </p> |
| 1773 | <blockquote class="text"> |
| 1774 | <p>C: "SET AUDIO_OUTPUT_DEVICE_PARAMETER 0 FRAGMENTSIZE=128" |
| 1775 | </p> |
| 1776 | <p>S: "OK" |
| 1777 | </p> |
| 1778 | </blockquote><p> |
| 1779 | |
| 1780 | </p> |
| 1781 | <a name="GET AUDIO_OUTPUT_CHANNEL INFO"></a><br /><hr /> |
| 1782 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1783 | <a name="rfc.section.6.2.11"></a><h3>6.2.11. Getting information about an audio channel</h3> |
| 1784 | |
| 1785 | <p>Use the following command to get information about an audio channel: |
| 1786 | </p> |
| 1787 | <p> |
| 1788 | </p> |
| 1789 | <blockquote class="text"> |
| 1790 | <p>GET AUDIO_OUTPUT_CHANNEL INFO <device-id> <audio-chan> |
| 1791 | </p> |
| 1792 | </blockquote><p> |
| 1793 | |
| 1794 | </p> |
| 1795 | <p>Where <device-id> is the numerical ID of the audio output device as given by the |
| 1796 | <a class="info" href="#CREATE AUDIO_OUTPUT_DEVICE">"CREATE AUDIO_OUTPUT_DEVICE"<span> (</span><span class="info">Creating an audio output device</span><span>)</span></a> |
| 1797 | or <a class="info" href="#LIST AUDIO_OUTPUT_DEVICES">"LIST AUDIO_OUTPUT_DEVICES"<span> (</span><span class="info">Getting all created audio output device list</span><span>)</span></a> |
| 1798 | command and <audio-chan> the audio channel number. |
| 1799 | </p> |
| 1800 | <p>Possible Answers: |
| 1801 | </p> |
| 1802 | <p> |
| 1803 | </p> |
| 1804 | <blockquote class="text"> |
| 1805 | <p>LinuxSampler will answer by sending a <CRLF> separated list. |
| 1806 | Each answer line begins with the information category name |
| 1807 | followed by a colon and then a space character <SP> and finally |
| 1808 | the info character string to that info category. At the moment |
| 1809 | the following information categories are defined: |
| 1810 | </p> |
| 1811 | <p> |
| 1812 | </p> |
| 1813 | <blockquote class="text"> |
| 1814 | <p>NAME - |
| 1815 | </p> |
| 1816 | <blockquote class="text"> |
| 1817 | <p>arbitrary character string naming the channel, which |
| 1818 | doesn't have to be unique (always returned by all audio channels) |
| 1819 | </p> |
| 1820 | </blockquote> |
| 1821 | |
| 1822 | |
| 1823 | <p>IS_MIX_CHANNEL - |
| 1824 | </p> |
| 1825 | <blockquote class="text"> |
| 1826 | <p>either true or false, a mix-channel is not a real, |
| 1827 | independent audio channel, but a virtual channel which |
| 1828 | is mixed to another real channel, this mechanism is |
| 1829 | needed for sampler engines which need more audio |
| 1830 | channels than the used audio system might be able to offer |
| 1831 | (always returned by all audio channels) |
| 1832 | </p> |
| 1833 | </blockquote> |
| 1834 | |
| 1835 | |
| 1836 | <p>MIX_CHANNEL_DESTINATION - |
| 1837 | </p> |
| 1838 | <blockquote class="text"> |
| 1839 | <p>numerical ID (positive integer including 0) |
| 1840 | which reflects the real audio channel (of the same audio |
| 1841 | output device) this mix channel refers to, means where |
| 1842 | the audio signal actually will be routed / added to |
| 1843 | (only returned in case the audio channel is mix channel) |
| 1844 | </p> |
| 1845 | </blockquote> |
| 1846 | |
| 1847 | |
| 1848 | </blockquote> |
| 1849 | |
| 1850 | |
| 1851 | </blockquote><p> |
| 1852 | |
| 1853 | </p> |
| 1854 | <p>The mentioned fields above don't have to be in particular |
| 1855 | order. The fields above are only those fields which are |
| 1856 | generally returned for the described cases by all audio |
| 1857 | channels regardless of the audio driver. Every audio channel |
| 1858 | might have its own, additional driver and channel specific |
| 1859 | parameters. |
| 1860 | </p> |
| 1861 | <p>Examples: |
| 1862 | </p> |
| 1863 | <p> |
| 1864 | </p> |
| 1865 | <blockquote class="text"> |
| 1866 | <p>C: "GET AUDIO_OUTPUT_CHANNEL INFO 0 0" |
| 1867 | </p> |
| 1868 | <p>S: "NAME: studio monitor left" |
| 1869 | </p> |
| 1870 | <p> "IS_MIX_CHANNEL: false" |
| 1871 | </p> |
| 1872 | <p> "." |
| 1873 | </p> |
| 1874 | </blockquote><p> |
| 1875 | |
| 1876 | </p> |
| 1877 | <p> |
| 1878 | </p> |
| 1879 | <blockquote class="text"> |
| 1880 | <p>C: "GET AUDIO_OUTPUT_CHANNEL INFO 0 1" |
| 1881 | </p> |
| 1882 | <p>S: "NAME: studio monitor right" |
| 1883 | </p> |
| 1884 | <p> "IS_MIX_CHANNEL: false" |
| 1885 | </p> |
| 1886 | <p> "." |
| 1887 | </p> |
| 1888 | </blockquote><p> |
| 1889 | |
| 1890 | </p> |
| 1891 | <p> |
| 1892 | </p> |
| 1893 | <blockquote class="text"> |
| 1894 | <p>C: "GET AUDIO_OUTPUT_CHANNEL INFO 0 2" |
| 1895 | </p> |
| 1896 | <p>S: "NAME: studio monitor left" |
| 1897 | </p> |
| 1898 | <p> "IS_MIX_CHANNEL: true" |
| 1899 | </p> |
| 1900 | <p> "MIX_CHANNEL_DESTINATION: 1" |
| 1901 | </p> |
| 1902 | <p> "." |
| 1903 | </p> |
| 1904 | </blockquote><p> |
| 1905 | |
| 1906 | </p> |
| 1907 | <p> |
| 1908 | </p> |
| 1909 | <blockquote class="text"> |
| 1910 | <p>C: "GET AUDIO_OUTPUT_CHANNEL INFO 1 0" |
| 1911 | </p> |
| 1912 | <p>S: "NAME: 'ardour (left)'" |
| 1913 | </p> |
| 1914 | <p> "IS_MIX_CHANNEL: false" |
| 1915 | </p> |
| 1916 | <p> "JACK_BINDINGS: 'ardour:0'" |
| 1917 | </p> |
| 1918 | <p> "." |
| 1919 | </p> |
| 1920 | </blockquote><p> |
| 1921 | |
| 1922 | </p> |
| 1923 | <a name="GET AUDIO_OUTPUT_CHANNEL_PARAMETER INFO"></a><br /><hr /> |
| 1924 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 1925 | <a name="rfc.section.6.2.12"></a><h3>6.2.12. Getting information about specific audio channel parameter</h3> |
| 1926 | |
| 1927 | <p>Use the following command to get detailed information about specific audio channel parameter: |
| 1928 | </p> |
| 1929 | <p> |
| 1930 | </p> |
| 1931 | <blockquote class="text"> |
| 1932 | <p>GET AUDIO_OUTPUT_CHANNEL_PARAMETER INFO <dev-id> <chan> <param> |
| 1933 | </p> |
| 1934 | </blockquote><p> |
| 1935 | |
| 1936 | </p> |
| 1937 | <p>Where <dev-id> is the numerical ID of the audio output device as returned by the |
| 1938 | <a class="info" href="#CREATE AUDIO_OUTPUT_DEVICE">"CREATE AUDIO_OUTPUT_DEVICE"<span> (</span><span class="info">Creating an audio output device</span><span>)</span></a> |
| 1939 | or <a class="info" href="#LIST AUDIO_OUTPUT_DEVICES">"LIST AUDIO_OUTPUT_DEVICES"<span> (</span><span class="info">Getting all created audio output device list</span><span>)</span></a> |
| 1940 | command, <chan> the audio channel number |
| 1941 | and <param> a specific channel parameter name for which information should |
| 1942 | be obtained (as returned by the <a class="info" href="#GET AUDIO_OUTPUT_CHANNEL INFO">"GET AUDIO_OUTPUT_CHANNEL INFO"<span> (</span><span class="info">Getting information about an audio channel</span><span>)</span></a> command). |
| 1943 | </p> |
| 1944 | <p>Possible Answers: |
| 1945 | </p> |
| 1946 | <p> |
| 1947 | </p> |
| 1948 | <blockquote class="text"> |
| 1949 | <p>LinuxSampler will answer by sending a <CRLF> separated list. |
| 1950 | Each answer line begins with the information category name |
| 1951 | followed by a colon and then a space character <SP> and finally |
| 1952 | the info character string to that info category. There are |
| 1953 | information which is always returned, independently of the |
| 1954 | given channel parameter and there is optional information |
| 1955 | which is only shown dependently to the given audio channel. At |
| 1956 | the moment the following information categories are defined: |
| 1957 | </p> |
| 1958 | <p> |
| 1959 | </p> |
| 1960 | <blockquote class="text"> |
| 1961 | <p>TYPE - |
| 1962 | </p> |
| 1963 | <blockquote class="text"> |
| 1964 | <p>either "BOOL" for boolean value(s) or "INT" for integer |
| 1965 | value(s) or "FLOAT" for dotted number(s) or "STRING" for |
| 1966 | character string(s) |
| 1967 | (always returned) |
| 1968 | </p> |
| 1969 | </blockquote> |
| 1970 | |
| 1971 | |
| 1972 | <p>DESCRIPTION - |
| 1973 | </p> |
| 1974 | <blockquote class="text"> |
| 1975 | <p>arbitrary text describing the purpose of the parameter (always returned) |
| 1976 | </p> |
| 1977 | </blockquote> |
| 1978 | |
| 1979 | |
| 1980 | <p>FIX - |
| 1981 | </p> |
| 1982 | <blockquote class="text"> |
| 1983 | <p>either true or false, if true then this parameter is |
| 1984 | read only, thus cannot be altered |
| 1985 | (always returned) |
| 1986 | </p> |
| 1987 | </blockquote> |
| 1988 | |
| 1989 | |
| 1990 | <p>MULTIPLICITY - |
| 1991 | </p> |
| 1992 | <blockquote class="text"> |
| 1993 | <p>either true or false, defines if this parameter allows |
| 1994 | only one value or a list of values, where true means |
| 1995 | multiple values and false only a single value allowed |
| 1996 | (always returned) |
| 1997 | </p> |
| 1998 | </blockquote> |
| 1999 | |
| 2000 | |
| 2001 | <p>RANGE_MIN - |
| 2002 | </p> |
| 2003 | <blockquote class="text"> |
| 2004 | <p>defines lower limit of the allowed value range for this |
| 2005 | parameter, can be an integer value as well as a dotted |
| 2006 | number, usually used in conjunction with 'RANGE_MAX', |
| 2007 | but may also appear without |
| 2008 | (optionally returned, dependent to driver and channel |
| 2009 | parameter) |
| 2010 | </p> |
| 2011 | </blockquote> |
| 2012 | |
| 2013 | |
| 2014 | <p>RANGE_MAX - |
| 2015 | </p> |
| 2016 | <blockquote class="text"> |
| 2017 | <p>defines upper limit of the allowed value range for this |
| 2018 | parameter, can be an integer value as well as a dotted |
| 2019 | number, usually used in conjunction with 'RANGE_MIN', |
| 2020 | but may also appear without |
| 2021 | (optionally returned, dependent to driver and channel |
| 2022 | parameter) |
| 2023 | </p> |
| 2024 | </blockquote> |
| 2025 | |
| 2026 | |
| 2027 | <p>POSSIBILITIES - |
| 2028 | </p> |
| 2029 | <blockquote class="text"> |
| 2030 | <p>comma separated list of possible values for this |
| 2031 | parameter, character strings are encapsulated into |
| 2032 | apostrophes |
| 2033 | (optionally returned, dependent to driver and channel |
| 2034 | parameter) |
| 2035 | </p> |
| 2036 | </blockquote> |
| 2037 | |
| 2038 | |
| 2039 | </blockquote> |
| 2040 | |
| 2041 | |
| 2042 | <p>The mentioned fields above don't have to be in particular order. |
| 2043 | </p> |
| 2044 | </blockquote><p> |
| 2045 | |
| 2046 | </p> |
| 2047 | <p>Example: |
| 2048 | </p> |
| 2049 | <p> |
| 2050 | </p> |
| 2051 | <blockquote class="text"> |
| 2052 | <p>C: "GET AUDIO_OUTPUT_CHANNEL_PARAMETER INFO 1 0 JACK_BINDINGS" |
| 2053 | </p> |
| 2054 | <p>S: "DESCRIPTION: bindings to other JACK clients" |
| 2055 | </p> |
| 2056 | <p> "TYPE: STRING" |
| 2057 | </p> |
| 2058 | <p> "FIX: false" |
| 2059 | </p> |
| 2060 | <p> "MULTIPLICITY: true" |
| 2061 | </p> |
| 2062 | <p> "POSSIBILITIES: 'PCM:0','PCM:1','ardour:0','ardour:1'" |
| 2063 | </p> |
| 2064 | <p> "." |
| 2065 | </p> |
| 2066 | </blockquote><p> |
| 2067 | |
| 2068 | </p> |
| 2069 | <a name="SET AUDIO_OUTPUT_CHANNEL_PARAMETER"></a><br /><hr /> |
| 2070 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2071 | <a name="rfc.section.6.2.13"></a><h3>6.2.13. Changing settings of audio output channels</h3> |
| 2072 | |
| 2073 | <p>Use the following command to alter a specific setting of an audio output channel: |
| 2074 | </p> |
| 2075 | <p> |
| 2076 | </p> |
| 2077 | <blockquote class="text"> |
| 2078 | <p>SET AUDIO_OUTPUT_CHANNEL_PARAMETER <dev-id> <chn> <key>=<value> |
| 2079 | </p> |
| 2080 | </blockquote><p> |
| 2081 | |
| 2082 | </p> |
| 2083 | <p>Where <dev-id> should be replaced by the numerical ID of the audio output device as returned by the |
| 2084 | <a class="info" href="#CREATE AUDIO_OUTPUT_DEVICE">"CREATE AUDIO_OUTPUT_DEVICE"<span> (</span><span class="info">Creating an audio output device</span><span>)</span></a> |
| 2085 | or <a class="info" href="#LIST AUDIO_OUTPUT_DEVICES">"LIST AUDIO_OUTPUT_DEVICES"<span> (</span><span class="info">Getting all created audio output device list</span><span>)</span></a> |
| 2086 | command, <chn> by the audio channel number, <key> by the name of the |
| 2087 | parameter to change and <value> by the new value for this parameter. |
| 2088 | </p> |
| 2089 | <p>Possible Answers: |
| 2090 | </p> |
| 2091 | <p> |
| 2092 | </p> |
| 2093 | <blockquote class="text"> |
| 2094 | <p>"OK" - |
| 2095 | </p> |
| 2096 | <blockquote class="text"> |
| 2097 | <p>in case setting was successfully changed |
| 2098 | </p> |
| 2099 | </blockquote> |
| 2100 | |
| 2101 | |
| 2102 | <p>"WRN:<warning-code>:<warning-message>" - |
| 2103 | </p> |
| 2104 | <blockquote class="text"> |
| 2105 | <p>in case setting was changed successfully, but there are |
| 2106 | noteworthy issue(s) related, providing an appropriate |
| 2107 | warning code and warning message |
| 2108 | </p> |
| 2109 | </blockquote> |
| 2110 | |
| 2111 | |
| 2112 | <p>"ERR:<error-code>:<error-message>" - |
| 2113 | </p> |
| 2114 | <blockquote class="text"> |
| 2115 | <p>in case it failed, providing an appropriate error code and |
| 2116 | error message |
| 2117 | </p> |
| 2118 | </blockquote> |
| 2119 | |
| 2120 | |
| 2121 | </blockquote><p> |
| 2122 | |
| 2123 | </p> |
| 2124 | <p>Example: |
| 2125 | </p> |
| 2126 | <p> |
| 2127 | </p> |
| 2128 | <blockquote class="text"> |
| 2129 | <p>C: "SET AUDIO_OUTPUT_CHANNEL PARAMETER 0 0 JACK_BINDINGS='PCM:0'" |
| 2130 | </p> |
| 2131 | <p>S: "OK" |
| 2132 | </p> |
| 2133 | </blockquote><p> |
| 2134 | |
| 2135 | </p> |
| 2136 | <p> |
| 2137 | </p> |
| 2138 | <blockquote class="text"> |
| 2139 | <p>C: "SET AUDIO_OUTPUT_CHANNEL PARAMETER 0 0 NAME='monitor left'" |
| 2140 | </p> |
| 2141 | <p>S: "OK" |
| 2142 | </p> |
| 2143 | </blockquote><p> |
| 2144 | |
| 2145 | </p> |
| 2146 | <a name="anchor10"></a><br /><hr /> |
| 2147 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2148 | <a name="rfc.section.6.3"></a><h3>6.3. Configuring MIDI input drivers</h3> |
| 2149 | |
| 2150 | <p>Instances of drivers in LinuxSampler are called devices. You can use |
| 2151 | multiple MIDI devices simultaneously, e.g. to use MIDI over ethernet as |
| 2152 | MIDI input on one sampler channel and ALSA as MIDI input on another sampler |
| 2153 | channel. For particular MIDI input systems it's also possible to create |
| 2154 | several devices of the same MIDI input type. This chapter describes all |
| 2155 | commands to configure LinuxSampler's MIDI input devices and their parameters. |
| 2156 | </p> |
| 2157 | <p>Instead of defining commands and parameters for each driver individually, |
| 2158 | all possible parameters, their meanings and possible values have to be obtained |
| 2159 | at runtime. This makes the protocol a bit abstract, but has the advantage, that |
| 2160 | front-ends can be written independently of what drivers are currently implemented |
| 2161 | and what parameters these drivers are actually offering. This means front-ends can |
| 2162 | even handle drivers which are implemented somewhere in future without modifying |
| 2163 | the front-end at all. |
| 2164 | </p> |
| 2165 | <p>Commands for configuring MIDI input devices are pretty much the same as the |
| 2166 | commands for configuring audio output drivers, already described in the last |
| 2167 | chapter. |
| 2168 | </p> |
| 2169 | <p>Note: examples in this chapter showing particular parameters of drivers are |
| 2170 | not meant as specification of the drivers' parameters. Driver implementations in |
| 2171 | LinuxSampler might have complete different parameter names and meanings than shown |
| 2172 | in these examples or might change in future, so these examples are only meant for |
| 2173 | showing how to retrieve what parameters drivers are offering, how to retrieve their |
| 2174 | possible values, etc. |
| 2175 | </p> |
| 2176 | <a name="GET AVAILABLE_MIDI_INPUT_DRIVERS"></a><br /><hr /> |
| 2177 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2178 | <a name="rfc.section.6.3.1"></a><h3>6.3.1. Getting amount of available MIDI input drivers</h3> |
| 2179 | |
| 2180 | <p>Use the following command to get the number of |
| 2181 | MIDI input drivers currently available for the |
| 2182 | LinuxSampler instance: |
| 2183 | </p> |
| 2184 | <p> |
| 2185 | </p> |
| 2186 | <blockquote class="text"> |
| 2187 | <p>GET AVAILABLE_MIDI_INPUT_DRIVERS |
| 2188 | </p> |
| 2189 | </blockquote><p> |
| 2190 | |
| 2191 | </p> |
| 2192 | <p>Possible Answers: |
| 2193 | </p> |
| 2194 | <p> |
| 2195 | </p> |
| 2196 | <blockquote class="text"> |
| 2197 | <p>LinuxSampler will answer by sending the |
| 2198 | number of available MIDI input drivers. |
| 2199 | </p> |
| 2200 | </blockquote><p> |
| 2201 | |
| 2202 | </p> |
| 2203 | <p>Example: |
| 2204 | </p> |
| 2205 | <p> |
| 2206 | </p> |
| 2207 | <blockquote class="text"> |
| 2208 | <p>C: "GET AVAILABLE_MIDI_INPUT_DRIVERS" |
| 2209 | </p> |
| 2210 | <p>S: "2" |
| 2211 | </p> |
| 2212 | </blockquote><p> |
| 2213 | |
| 2214 | </p> |
| 2215 | <a name="LIST AVAILABLE_MIDI_INPUT_DRIVERS"></a><br /><hr /> |
| 2216 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2217 | <a name="rfc.section.6.3.2"></a><h3>6.3.2. Getting all available MIDI input drivers</h3> |
| 2218 | |
| 2219 | <p>Use the following command to list all MIDI input drivers currently available |
| 2220 | for the LinuxSampler instance: |
| 2221 | </p> |
| 2222 | <p> |
| 2223 | </p> |
| 2224 | <blockquote class="text"> |
| 2225 | <p>LIST AVAILABLE_MIDI_INPUT_DRIVERS |
| 2226 | </p> |
| 2227 | </blockquote><p> |
| 2228 | |
| 2229 | </p> |
| 2230 | <p>Possible Answers: |
| 2231 | </p> |
| 2232 | <p> |
| 2233 | </p> |
| 2234 | <blockquote class="text"> |
| 2235 | <p>LinuxSampler will answer by sending comma separated character |
| 2236 | strings, each symbolizing a MIDI input driver. |
| 2237 | </p> |
| 2238 | </blockquote><p> |
| 2239 | |
| 2240 | </p> |
| 2241 | <p>Example: |
| 2242 | </p> |
| 2243 | <p> |
| 2244 | </p> |
| 2245 | <blockquote class="text"> |
| 2246 | <p>C: "LIST AVAILABLE_MIDI_INPUT_DRIVERS" |
| 2247 | </p> |
| 2248 | <p>S: "ALSA,JACK" |
| 2249 | </p> |
| 2250 | </blockquote><p> |
| 2251 | |
| 2252 | </p> |
| 2253 | <a name="GET MIDI_INPUT_DRIVER INFO"></a><br /><hr /> |
| 2254 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2255 | <a name="rfc.section.6.3.3"></a><h3>6.3.3. Getting information about a specific MIDI input driver</h3> |
| 2256 | |
| 2257 | <p>Use the following command to get detailed information about a specific MIDI input driver: |
| 2258 | </p> |
| 2259 | <p> |
| 2260 | </p> |
| 2261 | <blockquote class="text"> |
| 2262 | <p>GET MIDI_INPUT_DRIVER INFO <midi-input-driver> |
| 2263 | </p> |
| 2264 | </blockquote><p> |
| 2265 | |
| 2266 | </p> |
| 2267 | <p>Where <midi-input-driver> is the name of the MIDI input driver as returned |
| 2268 | by the <a class="info" href="#LIST AVAILABLE_MIDI_INPUT_DRIVERS">"LIST AVAILABLE_MIDI_INPUT_DRIVERS"<span> (</span><span class="info">Getting all available MIDI input drivers</span><span>)</span></a> command. |
| 2269 | </p> |
| 2270 | <p>Possible Answers: |
| 2271 | </p> |
| 2272 | <p> |
| 2273 | </p> |
| 2274 | <blockquote class="text"> |
| 2275 | <p>LinuxSampler will answer by sending a <CRLF> separated list. |
| 2276 | Each answer line begins with the information category name |
| 2277 | followed by a colon and then a space character <SP> and finally |
| 2278 | the info character string to that info category. At the moment |
| 2279 | the following information categories are defined: |
| 2280 | </p> |
| 2281 | <p> |
| 2282 | </p> |
| 2283 | <blockquote class="text"> |
| 2284 | <p>DESCRIPTION - |
| 2285 | </p> |
| 2286 | <blockquote class="text"> |
| 2287 | <p>arbitrary description text about the MIDI input driver |
| 2288 | </p> |
| 2289 | </blockquote> |
| 2290 | |
| 2291 | |
| 2292 | <p>VERSION - |
| 2293 | </p> |
| 2294 | <blockquote class="text"> |
| 2295 | <p>arbitrary character string regarding the driver's version |
| 2296 | </p> |
| 2297 | </blockquote> |
| 2298 | |
| 2299 | |
| 2300 | <p>PARAMETERS - |
| 2301 | </p> |
| 2302 | <blockquote class="text"> |
| 2303 | <p>comma separated list of all parameters available for the given MIDI input driver |
| 2304 | </p> |
| 2305 | </blockquote> |
| 2306 | |
| 2307 | |
| 2308 | </blockquote> |
| 2309 | |
| 2310 | |
| 2311 | <p>The mentioned fields above don't have to be in particular order. |
| 2312 | </p> |
| 2313 | </blockquote><p> |
| 2314 | |
| 2315 | </p> |
| 2316 | <p>Example: |
| 2317 | </p> |
| 2318 | <p> |
| 2319 | </p> |
| 2320 | <blockquote class="text"> |
| 2321 | <p>C: "GET MIDI_INPUT_DRIVER INFO ALSA" |
| 2322 | </p> |
| 2323 | <p>S: "DESCRIPTION: Advanced Linux Sound Architecture" |
| 2324 | </p> |
| 2325 | <p> "VERSION: 1.0" |
| 2326 | </p> |
| 2327 | <p> "PARAMETERS: DRIVER,ACTIVE" |
| 2328 | </p> |
| 2329 | <p> "." |
| 2330 | </p> |
| 2331 | </blockquote><p> |
| 2332 | |
| 2333 | </p> |
| 2334 | <a name="GET MIDI_INPUT_DRIVER_PARAMETER INFO"></a><br /><hr /> |
| 2335 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2336 | <a name="rfc.section.6.3.4"></a><h3>6.3.4. Getting information about specific MIDI input driver parameter</h3> |
| 2337 | |
| 2338 | <p>Use the following command to get detailed information about a specific parameter of a specific MIDI input driver: |
| 2339 | </p> |
| 2340 | <p> |
| 2341 | </p> |
| 2342 | <blockquote class="text"> |
| 2343 | <p>GET MIDI_INPUT_DRIVER_PARAMETER INFO <midit> <param> [<deplist>] |
| 2344 | </p> |
| 2345 | </blockquote><p> |
| 2346 | |
| 2347 | </p> |
| 2348 | <p>Where <midit> is the name of the MIDI input driver as returned |
| 2349 | by the <a class="info" href="#LIST AVAILABLE_MIDI_INPUT_DRIVERS">"LIST AVAILABLE_MIDI_INPUT_DRIVERS"<span> (</span><span class="info">Getting all available MIDI input drivers</span><span>)</span></a> command, <param> a specific |
| 2350 | parameter name for which information should be obtained (as returned by the |
| 2351 | <a class="info" href="#GET MIDI_INPUT_DRIVER INFO">"GET MIDI_INPUT_DRIVER INFO"<span> (</span><span class="info">Getting information about a specific MIDI input driver</span><span>)</span></a> command) and <deplist> is an optional list |
| 2352 | of parameters on which the sought parameter <param> depends on, |
| 2353 | <deplist> is a key-value pair list in form of "key1=val1 key2=val2 ...", |
| 2354 | where character string values are encapsulated into apostrophes ('). Arguments |
| 2355 | given with <deplist> which are not dependency parameters of <param> |
| 2356 | will be ignored, means the front-end application can simply put all parameters |
| 2357 | in <deplist> with the values selected by the user. |
| 2358 | </p> |
| 2359 | <p>Possible Answers: |
| 2360 | </p> |
| 2361 | <p>LinuxSampler will answer by sending a <CRLF> separated list. |
| 2362 | Each answer line begins with the information category name |
| 2363 | followed by a colon and then a space character <SP> and finally |
| 2364 | the info character string to that info category. There is |
| 2365 | information which is always returned, independent of the |
| 2366 | given driver parameter and there is optional information |
| 2367 | which is only shown dependent to given driver parameter. At |
| 2368 | the moment the following information categories are defined: |
| 2369 | </p> |
| 2370 | <p> |
| 2371 | </p> |
| 2372 | <blockquote class="text"> |
| 2373 | <p>TYPE - |
| 2374 | </p> |
| 2375 | <blockquote class="text"> |
| 2376 | <p>either "BOOL" for boolean value(s) or "INT" for integer |
| 2377 | value(s) or "FLOAT" for dotted number(s) or "STRING" for |
| 2378 | character string(s) |
| 2379 | (always returned, no matter which driver parameter) |
| 2380 | </p> |
| 2381 | </blockquote> |
| 2382 | |
| 2383 | |
| 2384 | <p>DESCRIPTION - |
| 2385 | </p> |
| 2386 | <blockquote class="text"> |
| 2387 | <p>arbitrary text describing the purpose of the parameter |
| 2388 | (always returned, no matter which driver parameter) |
| 2389 | </p> |
| 2390 | </blockquote> |
| 2391 | |
| 2392 | |
| 2393 | <p>MANDATORY - |
| 2394 | </p> |
| 2395 | <blockquote class="text"> |
| 2396 | <p>either true or false, defines if this parameter must be |
| 2397 | given when the device is to be created with the |
| 2398 | <a class="info" href="#CREATE MIDI_INPUT_DEVICE">'CREATE MIDI_INPUT_DEVICE'<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> command |
| 2399 | (always returned, no matter which driver parameter) |
| 2400 | </p> |
| 2401 | </blockquote> |
| 2402 | |
| 2403 | |
| 2404 | <p>FIX - |
| 2405 | </p> |
| 2406 | <blockquote class="text"> |
| 2407 | <p>either true or false, if false then this parameter can |
| 2408 | be changed at any time, once the device is created by |
| 2409 | the <a class="info" href="#CREATE MIDI_INPUT_DEVICE">'CREATE MIDI_INPUT_DEVICE'<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> command |
| 2410 | (always returned, no matter which driver parameter) |
| 2411 | </p> |
| 2412 | </blockquote> |
| 2413 | |
| 2414 | |
| 2415 | <p>MULTIPLICITY - |
| 2416 | </p> |
| 2417 | <blockquote class="text"> |
| 2418 | <p>either true or false, defines if this parameter allows |
| 2419 | only one value or a list of values, where true means |
| 2420 | multiple values and false only a single value allowed |
| 2421 | (always returned, no matter which driver parameter) |
| 2422 | </p> |
| 2423 | </blockquote> |
| 2424 | |
| 2425 | |
| 2426 | <p>DEPENDS - |
| 2427 | </p> |
| 2428 | <blockquote class="text"> |
| 2429 | <p>comma separated list of parameters this parameter depends |
| 2430 | on, means the values for fields 'DEFAULT', 'RANGE_MIN', |
| 2431 | 'RANGE_MAX' and 'POSSIBILITIES' might depend on these |
| 2432 | listed parameters, for example assuming that an audio |
| 2433 | driver (like the ALSA driver) offers parameters 'card' |
| 2434 | and 'samplerate' then parameter 'samplerate' would |
| 2435 | depend on 'card' because the possible values for |
| 2436 | 'samplerate' depends on the sound card which can be |
| 2437 | chosen by the 'card' parameter |
| 2438 | (optionally returned, dependent to driver parameter) |
| 2439 | </p> |
| 2440 | </blockquote> |
| 2441 | |
| 2442 | |
| 2443 | <p>DEFAULT - |
| 2444 | </p> |
| 2445 | <blockquote class="text"> |
| 2446 | <p>reflects the default value for this parameter which is |
| 2447 | used when the device is created and not explicitly |
| 2448 | given with the <a class="info" href="#CREATE MIDI_INPUT_DEVICE">'CREATE MIDI_INPUT_DEVICE'<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> command, |
| 2449 | in case of MULTIPLCITY=true, this is a comma separated |
| 2450 | list, that's why character strings are encapsulated into |
| 2451 | apostrophes (') |
| 2452 | (optionally returned, dependent to driver parameter) |
| 2453 | </p> |
| 2454 | </blockquote> |
| 2455 | |
| 2456 | |
| 2457 | <p>RANGE_MIN - |
| 2458 | </p> |
| 2459 | <blockquote class="text"> |
| 2460 | <p>defines lower limit of the allowed value range for this |
| 2461 | parameter, can be an integer value as well as a dotted |
| 2462 | number, this parameter is often used in conjunction |
| 2463 | with RANGE_MAX, but may also appear without |
| 2464 | (optionally returned, dependent to driver parameter) |
| 2465 | </p> |
| 2466 | </blockquote> |
| 2467 | |
| 2468 | |
| 2469 | <p>RANGE_MAX - |
| 2470 | </p> |
| 2471 | <blockquote class="text"> |
| 2472 | <p>defines upper limit of the allowed value range for this |
| 2473 | parameter, can be an integer value as well as a dotted |
| 2474 | number, this parameter is often used in conjunction with |
| 2475 | RANGE_MIN, but may also appear without |
| 2476 | (optionally returned, dependent to driver parameter) |
| 2477 | </p> |
| 2478 | </blockquote> |
| 2479 | |
| 2480 | |
| 2481 | <p>POSSIBILITIES - |
| 2482 | </p> |
| 2483 | <blockquote class="text"> |
| 2484 | <p>comma separated list of possible values for this |
| 2485 | parameter, character strings are encapsulated into |
| 2486 | apostrophes |
| 2487 | (optionally returned, dependent to driver parameter) |
| 2488 | </p> |
| 2489 | </blockquote> |
| 2490 | |
| 2491 | |
| 2492 | </blockquote><p> |
| 2493 | |
| 2494 | </p> |
| 2495 | <p>The mentioned fields above don't have to be in particular order. |
| 2496 | </p> |
| 2497 | <p>Example: |
| 2498 | </p> |
| 2499 | <p> |
| 2500 | </p> |
| 2501 | <blockquote class="text"> |
| 2502 | <p>C: "GET MIDI_INPUT_DRIVER_PARAMETER INFO ALSA ACTIVE" |
| 2503 | </p> |
| 2504 | <p>S: "DESCRIPTION: Whether device is enabled" |
| 2505 | </p> |
| 2506 | <p> "TYPE: BOOL" |
| 2507 | </p> |
| 2508 | <p> "MANDATORY: false" |
| 2509 | </p> |
| 2510 | <p> "FIX: false" |
| 2511 | </p> |
| 2512 | <p> "MULTIPLICITY: false" |
| 2513 | </p> |
| 2514 | <p> "DEFAULT: true" |
| 2515 | </p> |
| 2516 | <p> "." |
| 2517 | </p> |
| 2518 | </blockquote><p> |
| 2519 | |
| 2520 | </p> |
| 2521 | <a name="CREATE MIDI_INPUT_DEVICE"></a><br /><hr /> |
| 2522 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2523 | <a name="rfc.section.6.3.5"></a><h3>6.3.5. Creating a MIDI input device</h3> |
| 2524 | |
| 2525 | <p>Use the following command to create a new MIDI input device for the desired MIDI input system: |
| 2526 | </p> |
| 2527 | <p> |
| 2528 | </p> |
| 2529 | <blockquote class="text"> |
| 2530 | <p>CREATE MIDI_INPUT_DEVICE <midi-input-driver> [<param-list>] |
| 2531 | </p> |
| 2532 | </blockquote><p> |
| 2533 | |
| 2534 | </p> |
| 2535 | <p>Where <midi-input-driver> should be replaced by the desired MIDI input system as returned |
| 2536 | by the <a class="info" href="#LIST AVAILABLE_MIDI_INPUT_DRIVERS">"LIST AVAILABLE_MIDI_INPUT_DRIVERS"<span> (</span><span class="info">Getting all available MIDI input drivers</span><span>)</span></a> command and <param-list> by an |
| 2537 | optional list of driver specific parameters in form of "key1=val1 key2=val2 ...", where |
| 2538 | character string values should be encapsulated into apostrophes ('). |
| 2539 | Note that there might be drivers which require parameter(s) to be |
| 2540 | given with this command. Use the previously described commands in |
| 2541 | this chapter to get that information. |
| 2542 | </p> |
| 2543 | <p>Possible Answers: |
| 2544 | </p> |
| 2545 | <p> |
| 2546 | </p> |
| 2547 | <blockquote class="text"> |
| 2548 | <p>"OK[<device-id>]" - |
| 2549 | </p> |
| 2550 | <blockquote class="text"> |
| 2551 | <p>in case the device was successfully created, where |
| 2552 | <device-id> is the numerical ID of the new device |
| 2553 | </p> |
| 2554 | </blockquote> |
| 2555 | |
| 2556 | |
| 2557 | <p>"WRN[<device-id>]:<warning-code>:<warning-message>" - |
| 2558 | </p> |
| 2559 | <blockquote class="text"> |
| 2560 | <p>in case the driver was loaded successfully, where |
| 2561 | <device-id> is the numerical ID of the new device, but |
| 2562 | there are noteworthy issue(s) related, providing an |
| 2563 | appropriate warning code and warning message |
| 2564 | </p> |
| 2565 | </blockquote> |
| 2566 | |
| 2567 | |
| 2568 | <p>"ERR:<error-code>:<error-message>" - |
| 2569 | </p> |
| 2570 | <blockquote class="text"> |
| 2571 | <p>in case it failed, providing an appropriate error code and error message |
| 2572 | </p> |
| 2573 | </blockquote> |
| 2574 | |
| 2575 | |
| 2576 | </blockquote><p> |
| 2577 | |
| 2578 | </p> |
| 2579 | <p>Example: |
| 2580 | </p> |
| 2581 | <p> |
| 2582 | </p> |
| 2583 | <blockquote class="text"> |
| 2584 | <p>C: "CREATE MIDI_INPUT_DEVICE ALSA" |
| 2585 | </p> |
| 2586 | <p>S: "OK[0]" |
| 2587 | </p> |
| 2588 | </blockquote><p> |
| 2589 | |
| 2590 | </p> |
| 2591 | <a name="DESTROY MIDI_INPUT_DEVICE"></a><br /><hr /> |
| 2592 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2593 | <a name="rfc.section.6.3.6"></a><h3>6.3.6. Destroying a MIDI input device</h3> |
| 2594 | |
| 2595 | <p>Use the following command to destroy a created MIDI input device: |
| 2596 | </p> |
| 2597 | <p> |
| 2598 | </p> |
| 2599 | <blockquote class="text"> |
| 2600 | <p>DESTROY MIDI_INPUT_DEVICE <device-id> |
| 2601 | </p> |
| 2602 | </blockquote><p> |
| 2603 | |
| 2604 | </p> |
| 2605 | <p>Where <device-id> should be replaced by the device's numerical ID as returned by the |
| 2606 | <a class="info" href="#CREATE MIDI_INPUT_DEVICE">"CREATE MIDI_INPUT_DEVICE"<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> |
| 2607 | or <a class="info" href="#LIST MIDI_INPUT_DEVICES">"LIST MIDI_INPUT_DEVICES"<span> (</span><span class="info">Getting all created MIDI input device list</span><span>)</span></a> |
| 2608 | command. |
| 2609 | </p> |
| 2610 | <p>Possible Answers: |
| 2611 | </p> |
| 2612 | <p> |
| 2613 | </p> |
| 2614 | <blockquote class="text"> |
| 2615 | <p>"OK" - |
| 2616 | </p> |
| 2617 | <blockquote class="text"> |
| 2618 | <p>in case the device was successfully destroyed |
| 2619 | </p> |
| 2620 | </blockquote> |
| 2621 | |
| 2622 | |
| 2623 | <p>"WRN:<warning-code>:<warning-message>" - |
| 2624 | </p> |
| 2625 | <blockquote class="text"> |
| 2626 | <p>in case the device was destroyed, but there are noteworthy |
| 2627 | issue(s) related, providing an appropriate warning code and |
| 2628 | warning message |
| 2629 | </p> |
| 2630 | </blockquote> |
| 2631 | |
| 2632 | |
| 2633 | <p>"ERR:<error-code>:<error-message>" - |
| 2634 | </p> |
| 2635 | <blockquote class="text"> |
| 2636 | <p>in case it failed, providing an appropriate error code and error message |
| 2637 | </p> |
| 2638 | </blockquote> |
| 2639 | |
| 2640 | |
| 2641 | </blockquote><p> |
| 2642 | |
| 2643 | </p> |
| 2644 | <p>Example: |
| 2645 | </p> |
| 2646 | <p> |
| 2647 | </p> |
| 2648 | <blockquote class="text"> |
| 2649 | <p>C: "DESTROY MIDI_INPUT_DEVICE 0" |
| 2650 | </p> |
| 2651 | <p>S: "OK" |
| 2652 | </p> |
| 2653 | </blockquote><p> |
| 2654 | |
| 2655 | </p> |
| 2656 | <a name="GET MIDI_INPUT_DEVICES"></a><br /><hr /> |
| 2657 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2658 | <a name="rfc.section.6.3.7"></a><h3>6.3.7. Getting all created MIDI input device count</h3> |
| 2659 | |
| 2660 | <p>Use the following command to count all created MIDI input devices: |
| 2661 | </p> |
| 2662 | <p> |
| 2663 | </p> |
| 2664 | <blockquote class="text"> |
| 2665 | <p>GET MIDI_INPUT_DEVICES |
| 2666 | </p> |
| 2667 | </blockquote><p> |
| 2668 | |
| 2669 | </p> |
| 2670 | <p>Possible Answers: |
| 2671 | </p> |
| 2672 | <p> |
| 2673 | </p> |
| 2674 | <blockquote class="text"> |
| 2675 | <p>LinuxSampler will answer by sending the current number of all |
| 2676 | MIDI input devices. |
| 2677 | </p> |
| 2678 | </blockquote><p> |
| 2679 | |
| 2680 | </p> |
| 2681 | <p>Example: |
| 2682 | </p> |
| 2683 | <p> |
| 2684 | </p> |
| 2685 | <blockquote class="text"> |
| 2686 | <p>C: "GET MIDI_INPUT_DEVICES" |
| 2687 | </p> |
| 2688 | <p>S: "3" |
| 2689 | </p> |
| 2690 | </blockquote><p> |
| 2691 | |
| 2692 | </p> |
| 2693 | <a name="LIST MIDI_INPUT_DEVICES"></a><br /><hr /> |
| 2694 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2695 | <a name="rfc.section.6.3.8"></a><h3>6.3.8. Getting all created MIDI input device list</h3> |
| 2696 | |
| 2697 | <p>Use the following command to list all created MIDI input devices: |
| 2698 | </p> |
| 2699 | <p> |
| 2700 | </p> |
| 2701 | <blockquote class="text"> |
| 2702 | <p>LIST MIDI_INPUT_DEVICES |
| 2703 | </p> |
| 2704 | </blockquote><p> |
| 2705 | |
| 2706 | </p> |
| 2707 | <p>Possible Answers: |
| 2708 | </p> |
| 2709 | <p> |
| 2710 | </p> |
| 2711 | <blockquote class="text"> |
| 2712 | <p>LinuxSampler will answer by sending a comma separated list |
| 2713 | with the numerical Ids of all created MIDI input devices. |
| 2714 | </p> |
| 2715 | </blockquote><p> |
| 2716 | |
| 2717 | </p> |
| 2718 | <p>Examples: |
| 2719 | </p> |
| 2720 | <p> |
| 2721 | </p> |
| 2722 | <blockquote class="text"> |
| 2723 | <p>C: "LIST MIDI_INPUT_DEVICES" |
| 2724 | </p> |
| 2725 | <p>S: "0,1,2" |
| 2726 | </p> |
| 2727 | </blockquote><p> |
| 2728 | |
| 2729 | </p> |
| 2730 | <p> |
| 2731 | </p> |
| 2732 | <blockquote class="text"> |
| 2733 | <p>C: "LIST MIDI_INPUT_DEVICES" |
| 2734 | </p> |
| 2735 | <p>S: "1,3" |
| 2736 | </p> |
| 2737 | </blockquote><p> |
| 2738 | |
| 2739 | </p> |
| 2740 | <a name="GET MIDI_INPUT_DEVICE INFO"></a><br /><hr /> |
| 2741 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2742 | <a name="rfc.section.6.3.9"></a><h3>6.3.9. Getting current settings of a MIDI input device</h3> |
| 2743 | |
| 2744 | <p>Use the following command to get current settings of a specific, created MIDI input device: |
| 2745 | </p> |
| 2746 | <p> |
| 2747 | </p> |
| 2748 | <blockquote class="text"> |
| 2749 | <p>GET MIDI_INPUT_DEVICE INFO <device-id> |
| 2750 | </p> |
| 2751 | </blockquote><p> |
| 2752 | |
| 2753 | </p> |
| 2754 | <p>Where <device-id> is the numerical ID of the MIDI input device as returned by the |
| 2755 | <a class="info" href="#CREATE MIDI_INPUT_DEVICE">"CREATE MIDI_INPUT_DEVICE"<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> |
| 2756 | or <a class="info" href="#LIST MIDI_INPUT_DEVICES">"LIST MIDI_INPUT_DEVICES"<span> (</span><span class="info">Getting all created MIDI input device list</span><span>)</span></a> |
| 2757 | command. |
| 2758 | </p> |
| 2759 | <p>Possible Answers: |
| 2760 | </p> |
| 2761 | <p> |
| 2762 | </p> |
| 2763 | <blockquote class="text"> |
| 2764 | <p>LinuxSampler will answer by sending a <CRLF> separated list. |
| 2765 | Each answer line begins with the information category name |
| 2766 | followed by a colon and then a space character <SP> and finally |
| 2767 | the info character string to that info category. As some |
| 2768 | parameters might allow multiple values, character strings are |
| 2769 | encapsulated into apostrophes ('). At the moment the following |
| 2770 | information categories are defined (independent of driver): |
| 2771 | </p> |
| 2772 | <p> |
| 2773 | </p> |
| 2774 | <blockquote class="text"> |
| 2775 | <p>DRIVER - |
| 2776 | </p> |
| 2777 | <blockquote class="text"> |
| 2778 | <p>identifier of the used MIDI input driver, as e.g. |
| 2779 | returned by the <a class="info" href="#LIST AVAILABLE_MIDI_INPUT_DRIVERS">"LIST AVAILABLE_MIDI_INPUT_DRIVERS"<span> (</span><span class="info">Getting all available MIDI input drivers</span><span>)</span></a> |
| 2780 | command |
| 2781 | </p> |
| 2782 | </blockquote> |
| 2783 | |
| 2784 | |
| 2785 | </blockquote> |
| 2786 | |
| 2787 | <blockquote class="text"> |
| 2788 | <p>ACTIVE - |
| 2789 | </p> |
| 2790 | <blockquote class="text"> |
| 2791 | <p>either true or false, if false then the MIDI device is |
| 2792 | inactive and doesn't listen to any incoming MIDI events |
| 2793 | and thus doesn't forward them to connected sampler |
| 2794 | channels |
| 2795 | </p> |
| 2796 | </blockquote> |
| 2797 | |
| 2798 | |
| 2799 | </blockquote> |
| 2800 | |
| 2801 | |
| 2802 | </blockquote><p> |
| 2803 | |
| 2804 | </p> |
| 2805 | <p>The mentioned fields above don't have to be in particular |
| 2806 | order. The fields above are only those fields which are |
| 2807 | returned by all MIDI input devices. Every MIDI input driver |
| 2808 | might have its own, additional driver specific parameters (see |
| 2809 | <a class="info" href="#GET MIDI_INPUT_DRIVER INFO">"GET MIDI_INPUT_DRIVER INFO"<span> (</span><span class="info">Getting information about a specific MIDI input driver</span><span>)</span></a> command) which are also returned |
| 2810 | by this command. |
| 2811 | </p> |
| 2812 | <p>Example: |
| 2813 | </p> |
| 2814 | <p> |
| 2815 | </p> |
| 2816 | <blockquote class="text"> |
| 2817 | <p>C: "GET MIDI_INPUT_DEVICE INFO 0" |
| 2818 | </p> |
| 2819 | <p>S: "DRIVER: ALSA" |
| 2820 | </p> |
| 2821 | <p> "ACTIVE: true" |
| 2822 | </p> |
| 2823 | <p> "." |
| 2824 | </p> |
| 2825 | </blockquote><p> |
| 2826 | |
| 2827 | </p> |
| 2828 | <a name="SET MIDI_INPUT_DEVICE_PARAMETER"></a><br /><hr /> |
| 2829 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2830 | <a name="rfc.section.6.3.10"></a><h3>6.3.10. Changing settings of MIDI input devices</h3> |
| 2831 | |
| 2832 | <p>Use the following command to alter a specific setting of a created MIDI input device: |
| 2833 | </p> |
| 2834 | <p> |
| 2835 | </p> |
| 2836 | <blockquote class="text"> |
| 2837 | <p>SET MIDI_INPUT_DEVICE_PARAMETER <device-id> <key>=<value> |
| 2838 | </p> |
| 2839 | </blockquote><p> |
| 2840 | |
| 2841 | </p> |
| 2842 | <p>Where <device-id> should be replaced by the numerical ID of the |
| 2843 | MIDI input device as returned by the |
| 2844 | <a class="info" href="#CREATE MIDI_INPUT_DEVICE">"CREATE MIDI_INPUT_DEVICE"<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> |
| 2845 | or <a class="info" href="#LIST MIDI_INPUT_DEVICES">"LIST MIDI_INPUT_DEVICES"<span> (</span><span class="info">Getting all created MIDI input device list</span><span>)</span></a> |
| 2846 | command, <key> by the name of the parameter to change and |
| 2847 | <value> by the new value for this parameter. |
| 2848 | </p> |
| 2849 | <p>Possible Answers: |
| 2850 | </p> |
| 2851 | <p> |
| 2852 | </p> |
| 2853 | <blockquote class="text"> |
| 2854 | <p>"OK" - |
| 2855 | </p> |
| 2856 | <blockquote class="text"> |
| 2857 | <p>in case setting was successfully changed |
| 2858 | </p> |
| 2859 | </blockquote> |
| 2860 | |
| 2861 | |
| 2862 | <p>"WRN:<warning-code>:<warning-message>" - |
| 2863 | </p> |
| 2864 | <blockquote class="text"> |
| 2865 | <p>in case setting was changed successfully, but there are |
| 2866 | noteworthy issue(s) related, providing an appropriate |
| 2867 | warning code and warning message |
| 2868 | </p> |
| 2869 | </blockquote> |
| 2870 | |
| 2871 | |
| 2872 | <p>"ERR:<error-code>:<error-message>" - |
| 2873 | </p> |
| 2874 | <blockquote class="text"> |
| 2875 | <p>in case it failed, providing an appropriate error code and error message |
| 2876 | </p> |
| 2877 | </blockquote> |
| 2878 | |
| 2879 | |
| 2880 | </blockquote><p> |
| 2881 | |
| 2882 | </p> |
| 2883 | <p>Example: |
| 2884 | </p> |
| 2885 | <p> |
| 2886 | </p> |
| 2887 | <blockquote class="text"> |
| 2888 | <p>C: "SET MIDI_INPUT_DEVICE_PARAMETER 0 ACTIVE=false" |
| 2889 | </p> |
| 2890 | <p>S: "OK" |
| 2891 | </p> |
| 2892 | </blockquote><p> |
| 2893 | |
| 2894 | </p> |
| 2895 | <a name="GET MIDI_INPUT_PORT INFO"></a><br /><hr /> |
| 2896 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2897 | <a name="rfc.section.6.3.11"></a><h3>6.3.11. Getting information about a MIDI port</h3> |
| 2898 | |
| 2899 | <p>Use the following command to get information about a MIDI port: |
| 2900 | </p> |
| 2901 | <p> |
| 2902 | </p> |
| 2903 | <blockquote class="text"> |
| 2904 | <p>GET MIDI_INPUT_PORT INFO <device-id> <midi-port> |
| 2905 | </p> |
| 2906 | </blockquote><p> |
| 2907 | |
| 2908 | </p> |
| 2909 | <p>Where <device-id> is the numerical ID of the MIDI input device as returned by the |
| 2910 | <a class="info" href="#CREATE MIDI_INPUT_DEVICE">"CREATE MIDI_INPUT_DEVICE"<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> |
| 2911 | or <a class="info" href="#LIST MIDI_INPUT_DEVICES">"LIST MIDI_INPUT_DEVICES"<span> (</span><span class="info">Getting all created MIDI input device list</span><span>)</span></a> |
| 2912 | command and <midi-port> the MIDI input port number. |
| 2913 | </p> |
| 2914 | <p>Possible Answers: |
| 2915 | </p> |
| 2916 | <p> |
| 2917 | </p> |
| 2918 | <blockquote class="text"> |
| 2919 | <p>LinuxSampler will answer by sending a <CRLF> separated list. |
| 2920 | Each answer line begins with the information category name |
| 2921 | followed by a colon and then a space character <SP> and finally |
| 2922 | the info character string to that info category. At the moment |
| 2923 | the following information categories are defined: |
| 2924 | </p> |
| 2925 | <p>NAME - |
| 2926 | </p> |
| 2927 | <blockquote class="text"> |
| 2928 | <p>arbitrary character string naming the port |
| 2929 | </p> |
| 2930 | </blockquote> |
| 2931 | |
| 2932 | |
| 2933 | </blockquote><p> |
| 2934 | |
| 2935 | </p> |
| 2936 | <p>The field above is only the one which is returned by all MIDI |
| 2937 | ports regardless of the MIDI driver and port. Every MIDI port |
| 2938 | might have its own, additional driver and port specific |
| 2939 | parameters. |
| 2940 | </p> |
| 2941 | <p>Example: |
| 2942 | </p> |
| 2943 | <p> |
| 2944 | </p> |
| 2945 | <blockquote class="text"> |
| 2946 | <p>C: "GET MIDI_INPUT_PORT INFO 0 0" |
| 2947 | </p> |
| 2948 | <p>S: "NAME: 'Masterkeyboard'" |
| 2949 | </p> |
| 2950 | <p> "ALSA_SEQ_BINDINGS: '64:0'" |
| 2951 | </p> |
| 2952 | <p> "." |
| 2953 | </p> |
| 2954 | </blockquote><p> |
| 2955 | |
| 2956 | </p> |
| 2957 | <a name="GET MIDI_INPUT_PORT_PARAMETER INFO"></a><br /><hr /> |
| 2958 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 2959 | <a name="rfc.section.6.3.12"></a><h3>6.3.12. Getting information about specific MIDI port parameter</h3> |
| 2960 | |
| 2961 | <p>Use the following command to get detailed information about specific MIDI port parameter: |
| 2962 | </p> |
| 2963 | <p> |
| 2964 | </p> |
| 2965 | <blockquote class="text"> |
| 2966 | <p>GET MIDI_INPUT_PORT_PARAMETER INFO <dev-id> <port> <param> |
| 2967 | </p> |
| 2968 | </blockquote><p> |
| 2969 | |
| 2970 | </p> |
| 2971 | <p>Where <dev-id> is the numerical ID of the MIDI input device as returned by the |
| 2972 | <a class="info" href="#CREATE MIDI_INPUT_DEVICE">"CREATE MIDI_INPUT_DEVICE"<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> |
| 2973 | or <a class="info" href="#LIST MIDI_INPUT_DEVICES">"LIST MIDI_INPUT_DEVICES"<span> (</span><span class="info">Getting all created MIDI input device list</span><span>)</span></a> |
| 2974 | command, <port> the MIDI port number and |
| 2975 | <param> a specific port parameter name for which information should be |
| 2976 | obtained (as returned by the <a class="info" href="#GET MIDI_INPUT_PORT INFO">"GET MIDI_INPUT_PORT INFO"<span> (</span><span class="info">Getting information about a MIDI port</span><span>)</span></a> command). |
| 2977 | </p> |
| 2978 | <p>Possible Answers: |
| 2979 | </p> |
| 2980 | <p> |
| 2981 | </p> |
| 2982 | <blockquote class="text"> |
| 2983 | <p>LinuxSampler will answer by sending a <CRLF> separated list. |
| 2984 | Each answer line begins with the information category name |
| 2985 | followed by a colon and then a space character <SP> and finally |
| 2986 | the info character string to that info category. There is |
| 2987 | information which is always returned, independently of the |
| 2988 | given channel parameter and there is optional information |
| 2989 | which are only shown dependently to the given MIDI port. At the |
| 2990 | moment the following information categories are defined: |
| 2991 | </p> |
| 2992 | <p>TYPE - |
| 2993 | </p> |
| 2994 | <blockquote class="text"> |
| 2995 | <p>either "BOOL" for boolean value(s) or "INT" for integer |
| 2996 | value(s) or "FLOAT" for dotted number(s) or "STRING" for |
| 2997 | character string(s) |
| 2998 | (always returned) |
| 2999 | </p> |
| 3000 | </blockquote> |
| 3001 | |
| 3002 | |
| 3003 | <p>DESCRIPTION - |
| 3004 | </p> |
| 3005 | <blockquote class="text"> |
| 3006 | <p>arbitrary text describing the purpose of the parameter |
| 3007 | (always returned) |
| 3008 | </p> |
| 3009 | </blockquote> |
| 3010 | |
| 3011 | |
| 3012 | <p>FIX - |
| 3013 | </p> |
| 3014 | <blockquote class="text"> |
| 3015 | <p>either true or false, if true then this parameter is |
| 3016 | read only, thus cannot be altered |
| 3017 | (always returned) |
| 3018 | </p> |
| 3019 | </blockquote> |
| 3020 | |
| 3021 | |
| 3022 | <p>MULTIPLICITY - |
| 3023 | </p> |
| 3024 | <blockquote class="text"> |
| 3025 | <p>either true or false, defines if this parameter allows |
| 3026 | only one value or a list of values, where true means |
| 3027 | multiple values and false only a single value allowed |
| 3028 | (always returned) |
| 3029 | </p> |
| 3030 | </blockquote> |
| 3031 | |
| 3032 | |
| 3033 | <p>RANGE_MIN - |
| 3034 | </p> |
| 3035 | <blockquote class="text"> |
| 3036 | <p>defines lower limit of the allowed value range for this |
| 3037 | parameter, can be an integer value as well as a dotted |
| 3038 | number, this parameter is usually used in conjunction |
| 3039 | with 'RANGE_MAX' but may also appear without |
| 3040 | (optionally returned, dependent to driver and port |
| 3041 | parameter) |
| 3042 | </p> |
| 3043 | </blockquote> |
| 3044 | |
| 3045 | |
| 3046 | <p>RANGE_MAX - |
| 3047 | </p> |
| 3048 | <blockquote class="text"> |
| 3049 | <p>defines upper limit of the allowed value range for this |
| 3050 | parameter, can be an integer value as well as a dotted |
| 3051 | number, this parameter is usually used in conjunction |
| 3052 | with 'RANGE_MIN' but may also appear without |
| 3053 | (optionally returned, dependent to driver and port |
| 3054 | parameter) |
| 3055 | </p> |
| 3056 | </blockquote> |
| 3057 | |
| 3058 | |
| 3059 | <p>POSSIBILITIES - |
| 3060 | </p> |
| 3061 | <blockquote class="text"> |
| 3062 | <p>comma separated list of possible values for this |
| 3063 | parameter, character strings are encapsulated into |
| 3064 | apostrophes |
| 3065 | (optionally returned, dependent to device and port |
| 3066 | parameter) |
| 3067 | </p> |
| 3068 | </blockquote> |
| 3069 | |
| 3070 | |
| 3071 | </blockquote><p> |
| 3072 | |
| 3073 | </p> |
| 3074 | <p>The mentioned fields above don't have to be in particular order. |
| 3075 | </p> |
| 3076 | <p>Example: |
| 3077 | </p> |
| 3078 | <p> |
| 3079 | </p> |
| 3080 | <blockquote class="text"> |
| 3081 | <p>C: "GET MIDI_INPUT_PORT_PARAMETER INFO 0 0 ALSA_SEQ_BINDINGS" |
| 3082 | </p> |
| 3083 | <p>S: "DESCRIPTION: bindings to other ALSA sequencer clients" |
| 3084 | </p> |
| 3085 | <p> "TYPE: STRING" |
| 3086 | </p> |
| 3087 | <p> "FIX: false" |
| 3088 | </p> |
| 3089 | <p> "MULTIPLICITY: true" |
| 3090 | </p> |
| 3091 | <p> "POSSIBILITIES: '64:0','68:0','68:1'" |
| 3092 | </p> |
| 3093 | <p> "." |
| 3094 | </p> |
| 3095 | </blockquote><p> |
| 3096 | |
| 3097 | </p> |
| 3098 | <a name="SET MIDI_INPUT_PORT_PARAMETER"></a><br /><hr /> |
| 3099 | <table summary="layout" cellpadding="0" cellspacing="2" class="bug" align="right"><tr><td class="bug"><a href="#toc" class="link2"> TOC </a></td></tr></table> |
| 3100 | <a name="rfc.section.6.3.13"></a><h3>6.3.13. Changing settings of MIDI input ports</h3> |
| 3101 | |
| 3102 | <p>Use the following command to alter a specific setting of a MIDI input port: |
| 3103 | </p> |
| 3104 | <p> |
| 3105 | </p> |
| 3106 | <blockquote class="text"> |
| 3107 | <p>SET MIDI_INPUT_PORT_PARAMETER <device-id> <port> <key>=<value> |
| 3108 | </p> |
| 3109 | </blockquote><p> |
| 3110 | |
| 3111 | </p> |
| 3112 | <p>Where <device-id> should be replaced by the numerical ID of the |
| 3113 | MIDI device as returned by the |
| 3114 | <a class="info" href="#CREATE MIDI_INPUT_DEVICE">"CREATE MIDI_INPUT_DEVICE"<span> (</span><span class="info">Creating a MIDI input device</span><span>)</span></a> |
| 3115 | or <a class="info" href="#LIST MIDI_INPUT_DEVICES">"LIST MIDI_INPUT_DEVICES"<span> (</span><span class="info">Getting all created MIDI input device list</span><span>)</span></a> |
| 3116 | command, <port> by the MIDI port number, <key> by the name of |
| 3117 | the parameter to change and <value> by the new value for this |
| 3118 | parameter. |
| 3119 | </p> |
| 3120 | <p>Possible Answers: |
| 3121 | </p> |
| 3122 | <p> |
| 3123 | </p> |
| 3124 | <blockquote class="text"> |
| 3125 | <p>"OK" - |
| 3126 | </p> |
| 3127 | <blockquote class="text"> |
| 3128 | <p>in case setting was successfully changed |
| 3129 | </p> |
| 3130 | </blockquote> |
| 3131 | |
| 3132 | |
| 3133 | <p>"WRN:<warning-code>:<warning-message>" - |
| 3134 | </p> |
| 3135 | <blockquote class="text"> |
| 3136 | <p>in case setting was changed successfully, but there are |
| 3137 | noteworthy issue(s) related, providing an appropriate |
| 3138 | warning code and warning message |
| 3139 | </p> |
| 3140 | </blockquote> |
| 3141 | |
| 3142 | |
| 3143 | <p>"ERR:<error-code>:<error-message>" - |
| 3144 | </p> |
| 3145 | <blockquote class="text"> |
| 3146 | <p>in case it failed, providing an appropriate error code and error message |
| 3147 | </p> |
| 3148 | </blockquote> |
| 3149 | |
| 3150 | |
| 3151 | </blockquote><p> |
| 3152 | |
| 3153 | </p> |
| 3154 | <p>Example: |
| 3155 | </p> |
| 3156 | <p> |