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112 <div id="mainwindow"><img name="LinuxSampler" src="gfx/lsbackground.jpg" alt="LinuxSampler">
113
114 <h1><span class="hidden">The LinuxSampler Project</span></h1>
115
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169 <div id="contents">
170
171 <h2>FAQ</h2>
172 <div class="groupbox">
173 Here is a collection of frequently asked questions. Please read them before asking on
174 the mailing list.<br>
175 <br>
176 1.&nbsp;License<br>
177 &nbsp;&nbsp;&nbsp;&nbsp;1.1&nbsp;<a href="#commercial_products">Can I use LinuxSampler in commercial hardware or software products?</a><br>
178 &nbsp;&nbsp;&nbsp;&nbsp;1.2&nbsp;<a href="#commercial_music">Can I use LinuxSampler for commercial music production?</a><br>
179 &nbsp;&nbsp;&nbsp;&nbsp;1.3&nbsp;<a href="#open_source">LinuxSampler is not open source, you are evil!</a><br>
180 &nbsp;&nbsp;&nbsp;&nbsp;1.4&nbsp;<a href="#closed_source">Will LinuxSampler turn closed-source?</a><br>
181 &nbsp;&nbsp;&nbsp;&nbsp;1.5&nbsp;<a href="#ls_license_change">I've heard the commercial exception of LinuxSampler was added at a certain version?</a><br>
182 &nbsp;&nbsp;&nbsp;&nbsp;1.6&nbsp;<a href="#ls_breaking_libgig_license">Doesn't LinuxSampler illegally link against libgig?</a><br>
183 &nbsp;&nbsp;&nbsp;&nbsp;1.7&nbsp;<a href="#ls_breaking_license">Doesn't LinuxSampler illegally link against other libraries?</a><br>
184 2.&nbsp;General Questions<br>
185 &nbsp;&nbsp;&nbsp;&nbsp;2.1&nbsp;<a href="#aga">linuxsampler? qsampler? jsampler? libgig? liblscp? jlscp? ... hu?</a><br>
186 &nbsp;&nbsp;&nbsp;&nbsp;2.2&nbsp;<a href="#no_gui">Can I use linuxsampler without a GUI as well?</a><br>
187 3.&nbsp;Compilation / Installation<br>
188 &nbsp;&nbsp;&nbsp;&nbsp;3.1&nbsp;<a href="#install">What do I need to compile and install?</a><br>
189 &nbsp;&nbsp;&nbsp;&nbsp;3.2&nbsp;<a href="#compilarion_error">Compilation of LinuxSampler aborts with ...</a><br>
190 &nbsp;&nbsp;&nbsp;&nbsp;3.3&nbsp;<a href="#cvs_checkout">How do I checkout from CVS?</a><br>
191 &nbsp;&nbsp;&nbsp;&nbsp;3.4&nbsp;<a href="#compile_cvs">How do I compile from CVS?</a><br>
192 4.&nbsp;Setup<br>
193 &nbsp;&nbsp;&nbsp;&nbsp;4.1&nbsp;<a href="#examples_lscp">Are there example LSCP script files somewhere?</a><br>
194 &nbsp;&nbsp;&nbsp;&nbsp;4.2&nbsp;<a href="#dropouts">I get dropouts (click sounds, noise), what can I do about it?</a><br>
195 &nbsp;&nbsp;&nbsp;&nbsp;4.3&nbsp;<a href="#runtime_error">LinuxSampler aborts at runtime with ...</a><br>
196 <br>
197 </div>
198
199 <a name="commercial_products"></a>
200 <h3>Can I use LinuxSampler in commercial hardware or software products?</h3>
201 <p class="default">
202 You are NOT ALLOWED to use LinuxSampler source code, libraries or applications in
203 COMMERCIAL hardware or software products without prior written authorization by the
204 <a href="developers.html">authors</a>. <A HREF="downloads.html">See here</A>
205 </p>
206
207 <a name="commercial_music"></a>
208 <h3>Can I use LinuxSampler for commercial music production?</h3>
209 <p class="default">
210 Hell, yes! Every indirect commercial usage of LinuxSampler, which essentially means
211 using its audio output, can of course be used in commercial applications like music
212 productions, live shows, etc. Don't get us wrong, with the mentioned commercial
213 exception we don't want to restrict the normal user / musician, we just want to avoid
214 somebody to directly make money with our work, that is by selling our software in a
215 sampler product like a sampler + sample library bundle, a hardware sampler or
216 something equivalent, at least not without giving something back to the open source
217 Community.
218 </p>
219
220 <a name="open_source"></a>
221 <h3>LinuxSampler is not open source, you are evil!</h3>
222 <p class="default">
223 There are of course many definitions of the term "open source", but according to the
224 <a href="http://en.wikipedia.org/wiki/Open_source">definition on Wikipedia</a>
225 LinuxSampler is in fact open source, since you've got complete access to its source
226 code. So due to this fact, a normal user / musician is free to do with LinuxSampler
227 what he likes to do, he can even adjust and tweak every single part of the software
228 by modifying and compiling its source code. And just the fact that we want to avoid
229 our work to be directly exploited in commercial software or hardware products is
230 definitely not an "evil" intention. For the normal user / musician the commercial
231 restriction is even an advantage, since that way commercial actors are forced to
232 support this or another open source project either directly by coding or indirectly
233 by funding and thus increase development speed.
234 </p>
235
236 <a name="closed_source"></a>
237 <h3>Will LinuxSampler turn closed-source?</h3>
238 <p class="default">
239 No, LinuxSampler will remain open source. Again, the commercial exception is just to
240 prevent commercial exploitation by third parties that haven't contributed anything to
241 open source projects.
242 </p>
243
244 <a name="ls_license_change"></a>
245 <h3>I've heard the commercial exception of LinuxSampler was added at a certain version?</h3>
246 <p class="default">
247 No, the commercial exception in LinuxSampler's license terms were there since day one.
248 Even further it's not only there since the very first publicly available CVS
249 (developer) version of LinuxSampler, that commercial exception was even already in
250 Benno Senoner's proof of concept code called "EVO", which LinuxSampler was based on.
251 There was even a rumour that we would have manipulated CVS history to "pretend" this
252 exception wasn't added at a later point. Needless to say that this rumour is completely
253 false as well. Think about it! We're a group of developers spread around the world who
254 work on this project for fun and ideology in our spare time. Most of us contributed to
255 various other open source / free software projects. Do you seriously think we would
256 cheat on such an issue? Beside that you certainly find various people completely
257 unrelated to this project who still have early versions of LinuxSampler and / or EVO
258 and thus can confirm that this commercial exception was always there.
259 </p>
260
261 <a name="ls_breaking_libgig_license"></a>
262 <h3>Doesn't LinuxSampler illegally link against libgig?</h3>
263 <p class="default">
264 No! LinuxSampler does not "illegally" link against libgig, since the copyright holder
265 (in this case of libgig) has all rights of his work and thus is not bound to his own
266 license terms. The sole purpose of license terms is to grant other people certain
267 rights to use the work.
268 </p>
269
270 <a name="ls_breaking_license"></a>
271 <h3>Doesn't LinuxSampler illegally link against other libraries?</h3>
272 <p class="default">
273 No, the only library LinuxSampler links to that has license restrictions regarding
274 linking is libgig (<a href="#ls_breaking_libgig_license">see above</a>). Especially
275 LinuxSampler does not break Qt's license terms, since it does not link against Qt at
276 all.
277 </p>
278
279 <a name="aga"></a>
280 <h3>linuxsampler? qsampler? jsampler? gigedit? libgig? liblscp? jlscp? ... hu?</h3>
281 <p class="default">
282 There are currently seven subprojects in the LinuxSampler project; jlscp, jsampler,
283 libgig, liblscp, linuxsampler, gigedit and qsampler. linuxsampler is the core of the sampler, it includes the
284 sampler engines and audio and MIDI drivers. linuxsampler itself is decoupled from any
285 user interface. It offers a native C++ API as well as a network server (LSCP server) to allow to be controlled by
286 an arbitrary user frontend from an arbitrary place over a network connection or
287 (of course) locally from the same machine as well. This decoupled /
288 <a href="http://en.wikipedia.org/wiki/Backend">"backend"</a> design
289 of the sampler allows to run it even on a machine without any graphical interface,
290 without a Desktop, the machine doesn't even have to have a graphics card!
291 qsampler is the first <a href="http://en.wikipedia.org/wiki/Graphical_user_interface">GUI</a>
292 <a href="http://en.wikipedia.org/wiki/Frontend">frontend</a>
293 written for linuxsampler, it is written in C++ using the Qt
294 GUI library and thus can be compiled for various architectures and operating systems
295 without modifications of the source code.
296 gigedit is an instruments editor application for Gigasampler format files. You can
297 run it as stand-alone application or in conjunction with LinuxSampler. In the latter
298 case you can play and immediately hear all your modifications made with gigedit in
299 realtime.
300 libgig is a C++ library written for accessing Gigasampler files and DLS Level 1 and 2
301 files, that is for reading and (since version 3.0.0) also writing of those files.
302 libgig is used by linuxsampler to load Gigasampler files, it is used by gigedit to
303 load, modify and create new Gigasampler files and it <b>can</b> be
304 used by qsampler to retrieve additional informations about Gigasampler files. liblscp
305 is a C library written as a wrapper around the LSCP network protocol, thus to control
306 linuxsampler. It was originally designed to be used on both sides, that is on server /
307 backend side (linuxsampler) and on client / frontend side (e.g. qsampler). But it's now
308 only used on client side by qsampler at the moment. jsampler is another GUI frontend for
309 linuxsampler, it's written in Java and thus platform independent. jlscp is a library which
310 can be compared with liblscp, with the only difference that jlscp is written in Java and
311 liblscp in C. jsampler requires jlscp.
312
313 </p>
314
315 <a name="install"></a>
316 <h3>What do I need to compile and install?</h3>
317 <p class="default">
318 You should compile and install at least libgig and linuxsampler. As a beginner you should
319 definitely as well compile and install a convenient GUI frontend like either qsampler or
320 jsampler, whatever you prefer. qsampler depends on liblscp, so you have to
321 compile and install liblscp before starting to build qsampler. Also if you like to be
322 able to edit instruments, you should compile and install gigedit as well. The recommended
323 order to compile and install is:
324 <ol class="default">
325 <li>libgig</li>
326 <li>linuxsampler</li>
327 <li>gigedit</li>
328 <li>liblscp</li>
329 <li>qsampler</li>
330 </ol>
331 </p>
332 <p class="default">
333 Of course you can also install QSampler and JSampler side by side. So you can test and use
334 both at the same time.
335 </p>
336
337 <a name="compilarion_error"></a>
338 <h3>Compilation of LinuxSampler aborts with ... </h3>
339
340 <p class="default">
341 &bull;&nbsp;&nbsp;&nbsp;"<code>Required libgig version not found...</code>"<br>
342 <br>
343 This error might occur when running LinuxSampler's configure script. Make sure
344 you have the required libgig version installed. If you're compiling a CVS
345 version of LinuxSampler you usually have to compile and install the current
346 CVS version of libgig as well. Also note there are couple common mistakes which
347 let this error occur even after having compiled and installed the required
348 libgig version. Read
349 <a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=29">this bug report</a>
350 about common mistakes and how you can fix them.
351 </p>
352
353 <p class="default">
354 &bull;&nbsp;&nbsp;&nbsp;"<code>can't find a register in class `GENERAL_REGS' while reloading `asm'</code>"<br>
355 <br>
356 This is caused by the inline assembly code for
357 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
358 linuxsampler. You have to compile older versions of LinuxSampler (v0.3.3 and older) with
359 -O2 or -O3 to avoid this problem. Usually this is done by default, if not try:
360 <br>
361 </p>
362 <pre class="code">CXXFLAGS="-O3" ./configure
363 make</pre>
364 <p class="default">
365 Alternatively you could also disable all hand-crafted assembly optimization code by:
366 </p>
367 <pre class="code">./configure --disable-asm
368 make</pre>
369 <p class="default">
370 but the latter is definitely not recommended, as it will increase CPU usage a lot!
371 </p>
372
373 <p class="default">
374 &bull;&nbsp;&nbsp;&nbsp;"<code>../common/Resampler.h:142: error: memory input 2 is not directly addressable</code>"<br>
375 <br>
376 This was reported (<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9018347&forum_id=12792">1</a>,
377 <a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9019467&forum_id=12792">2</a>)
378 to be a gcc/g++ version problem, in conjunction with the inline assembly code for
379 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
380 linuxsampler. Make sure you got gcc and g++, both of version 3.3 or higher installed.
381 You can check this with:
382 </p>
383 <pre class="code">gcc --version
384 g++ --version</pre>
385 <p class="default">
386 In case you already got gcc and g++ of version 3.3 or higher
387 installed and it still causes the compilation error mentioned
388 above, try the following:
389 </p>
390 <pre class="code">export CC=`which gcc`
391 export CXX=`which g++`</pre>
392 <p class="default">
393 On certain systems however you still get this error in conjunction with older
394 versions of LinuxSampler (v0.3.3 and older). Fortunately newer versions of
395 linuxsampler are not affected anymore
396 (<a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=34">read this for details</a>).
397 </p>
398
399 <a name="cvs_checkout"></a>
400 <h3>How do I checkout from CVS?</h3>
401 <p class="default">
402 The procedure of checking out the newest version from CVS is described on the
403 <a href="downloads.html#cvs">Downloads</a> site and on the
404 <a href="http://cvs.linuxsampler.org/cgi-bin/viewcvs.cgi/">web interface site
405 of our CVS server</a>.
406 </p>
407
408 <a name="compile_cvs"></a>
409 <h3>How do I compile from CVS?</h3>
410 <p class="default">
411 The procedure for compiling from CVS is the same for all subprojects, that is no matter
412 if you are compiling linuxsampler, qsampler, libgig or liblscp from CVS, you need to
413 have the autotools (automake, autoconf and libtool) installed and compile it that way:
414 <pre class="code">make -f Makefile.cvs
415 ./configure
416 make</pre>
417 </p>
418
419 <a name="no_gui"></a>
420 <h3>Can I use linuxsampler without a GUI as well?</h3>
421 <p class="default">
422 Yes, but unfortunately there is no console based frontend for linuxsampler (yet).
423 You have to write LSCP scripts and send it to the running linuxsampler application. But
424 don't worry, if you don't know how to write LSCP scripts, you can also start by saving
425 a sampler session with QSampler, because the session files qsampler writes are actually
426 real LSCP scripts. You can send a LSCP script to linuxsampler on the console with the
427 following command:
428 </p>
429 <pre class="code">netcat localhost 8888 &lt; yourscript.lscp</pre>
430 <p class="default">
431 or on certain systems (like Debian) you have to provide the -t switch:
432 </p>
433 <pre class="code">netcat -t localhost 8888 &lt; yourscript.lscp</pre>
434 <p class="default">
435 Of course you can also replace localhost by the IP address of the machine where
436 linuxsampler is running. Alternatively you can also make a telnet connection (port 8888)
437 to linuxsampler's LSCP server and type commands manually.
438 </p>
439
440 <a name="examples_lscp"></a>
441 <h3>Are there example LSCP script files somewhere?</h3>
442 <p class="default">
443 Yes, have a look on the <a href="documentation.html">Documentation</a> site for some
444 common LSCP script examples. For details about LSCP read the
445 <a href="api/draft-linuxsampler-protocol.html">LSCP reference</a>. Be welcome to ask
446 questions for details about LSCP on the
447 <a href="http://lists.sourceforge.net/lists/listinfo/linuxsampler-devel">mailing list</a>.
448 </p>
449
450 <a name="dropouts"></a>
451 <h3>I get dropouts (click sounds, noise), what can I do about it?</h3>
452 <p class="default">
453 In order to achieve good results under Linux you need to have a
454 <a href="http://www.linuxdj.com/audio/lad/resourceslatency.php3">patched kernel</a>.
455 There are different patches available depending on what version (2.4.x or 2.6.x) of kernel you use.
456 The <a href="http://jackaudio.org/faq">JACK FAQ site</a>
457 (or the <a href="http://jackit.sourceforge.net/docs/faq.php">old JACK FAQ site</a>)
458 is also a good resource for
459 how to configure a realtime stable kernel. But note; LinuxSampler currently has not support for
460 libcap yet, that means if you are still using a 2.4.x Linux kernel you most probably have to run
461 LinuxSampler with root priviliges. As a rule of thumb: if you don't get warnings like "cannot
462 mlockall() memory" on the console, you are safe to run it as ordinary user as well.
463 </p>
464
465 <a name="runtime_error"></a>
466 <h3>LinuxSampler aborts at runtime with ... </h3>
467 <p class="default">
468 Note: For <b>Windows specific runtime errors</b>, please have a
469 look at the
470 <a href="windows.html#houston">Trouble Shooting</a> section of
471 the LinuxSampler Windows HOWTO.
472 </p>
473
474 <p class="default">
475 &bull;&nbsp;&nbsp;&nbsp;"<code>gig::Engine error: Failed to
476 load instrument, cause: Unknown exception while trying to
477 parse gig file.</code>"<br>
478 <br>
479 Usually LS gives you a meaningful error message in case it
480 failed to load an instrument. However there might be rare
481 cases where LS cannot resolve the reason and you get an
482 error message like above. In this case make sure security /
483 user limits aren't set too low. You can list your current
484 limits with:
485 </p>
486 <pre class="code">ulimit -a</pre>
487 <p class="default">
488 Usually most of those settings are set to "unlimited" on
489 most boxes. If this is not the case on yours, make sure that
490 at least the limits for "max locked memory", "virtual
491 memory" and "data seg size" are sufficiently high enough.
492 The exact value depends on the instruments you want to load.
493 If your security policy allows it, you could simply set
494 those limits to "unlimited" (see also config file
495 /etc/security/limits.conf and
496 <a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=41">bug report #41</a>).
497 </p>
498
499 </div>
500 </td></tr></table>
501
502 </div>
503
504 </body>
505 </html>

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