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112 <div id="mainwindow"><div class="lsbackground"><img name="LinuxSampler" src="gfx/lsbackground.jpg" alt="LinuxSampler"></div>
113
114 <h1><span class="hidden">The LinuxSampler Project</span></h1>
115
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159 <div id="contents">
160
161 <h2>FAQ</h2>
162 <div class="groupbox">
163 Here is a collection of frequently asked questions. Please read them before asking on
164 the mailing list.<br>
165 <br>
166 1.&nbsp;License<br>
167 &nbsp;&nbsp;&nbsp;&nbsp;1.1&nbsp;<a href="#commercial_products">Can I use LinuxSampler in commercial hardware or software products?</a><br>
168 &nbsp;&nbsp;&nbsp;&nbsp;1.2&nbsp;<a href="#commercial_music">Can I use LinuxSampler for commercial music production?</a><br>
169 &nbsp;&nbsp;&nbsp;&nbsp;1.3&nbsp;<a href="#open_source">LinuxSampler is not open source, you are evil!</a><br>
170 &nbsp;&nbsp;&nbsp;&nbsp;1.4&nbsp;<a href="#closed_source">Will LinuxSampler turn closed-source?</a><br>
171 &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>
172 &nbsp;&nbsp;&nbsp;&nbsp;1.6&nbsp;<a href="#ls_breaking_libgig_license">Doesn't LinuxSampler illegally link against libgig?</a><br>
173 &nbsp;&nbsp;&nbsp;&nbsp;1.7&nbsp;<a href="#ls_breaking_license">Doesn't LinuxSampler illegally link against other libraries?</a><br>
174 2.&nbsp;General Questions<br>
175 &nbsp;&nbsp;&nbsp;&nbsp;2.1&nbsp;<a href="#aga">linuxsampler? qsampler? jsampler? libgig? liblscp? jlscp? ... hu?</a><br>
176 &nbsp;&nbsp;&nbsp;&nbsp;2.2&nbsp;<a href="#no_gui">Can I use linuxsampler without a GUI as well?</a><br>
177 3.&nbsp;Compilation / Installation<br>
178 &nbsp;&nbsp;&nbsp;&nbsp;3.1&nbsp;<a href="#install">What do I need to compile and install?</a><br>
179 &nbsp;&nbsp;&nbsp;&nbsp;3.2&nbsp;<a href="#compilarion_error">Compilation of LinuxSampler aborts with ...</a><br>
180 &nbsp;&nbsp;&nbsp;&nbsp;3.3&nbsp;<a href="#svn_checkout">How do I checkout from Subversion?</a><br>
181 &nbsp;&nbsp;&nbsp;&nbsp;3.4&nbsp;<a href="#compile_svn">How do I compile from Subversion?</a><br>
182 4.&nbsp;Setup<br>
183 &nbsp;&nbsp;&nbsp;&nbsp;4.1&nbsp;<a href="#examples_lscp">Are there example LSCP script files somewhere?</a><br>
184 &nbsp;&nbsp;&nbsp;&nbsp;4.2&nbsp;<a href="#dropouts">I get dropouts (click sounds, noise), what can I do about it?</a><br>
185 &nbsp;&nbsp;&nbsp;&nbsp;4.3&nbsp;<a href="#runtime_error">LinuxSampler aborts at runtime with ...</a><br>
186 <br>
187 </div>
188
189 <a name="commercial_products"></a>
190 <h3>Can I use LinuxSampler in commercial hardware or software products?</h3>
191 <p class="default">
192 You are NOT ALLOWED to use LinuxSampler source code, libraries or applications in
193 COMMERCIAL hardware or software products without prior written authorization by the
194 <a href="developers.html">authors</a>. <A HREF="downloads.html">See here</A>
195 </p>
196
197 <a name="commercial_music"></a>
198 <h3>Can I use LinuxSampler for commercial music production?</h3>
199 <p class="default">
200 Hell, yes! Every indirect commercial usage of LinuxSampler, which essentially means
201 using its audio output, can of course be used in commercial applications like music
202 productions, live shows, etc. Don't get us wrong, with the mentioned commercial
203 exception we don't want to restrict the normal user / musician, we just want to avoid
204 somebody to directly make money with our work, that is by selling our software in a
205 sampler product like a sampler + sample library bundle, a hardware sampler or
206 something equivalent, at least not without giving something back to the open source
207 Community.
208 </p>
209
210 <a name="open_source"></a>
211 <h3>LinuxSampler is not open source, you are evil!</h3>
212 <p class="default">
213 There are of course many definitions of the term "open source", but according to the
214 <a href="http://en.wikipedia.org/wiki/Open_source">definition on Wikipedia</a>
215 LinuxSampler is in fact open source, since you've got complete access to its source
216 code. So due to this fact, a normal user / musician is free to do with LinuxSampler
217 what he likes to do, he can even adjust and tweak every single part of the software
218 by modifying and compiling its source code. And just the fact that we want to avoid
219 our work to be directly exploited in commercial software or hardware products is
220 definitely not an "evil" intention. For the normal user / musician the commercial
221 restriction is even an advantage, since that way commercial actors are forced to
222 support this or another open source project either directly by coding or indirectly
223 by funding and thus increase development speed.
224 </p>
225
226 <a name="closed_source"></a>
227 <h3>Will LinuxSampler turn closed-source?</h3>
228 <p class="default">
229 No, LinuxSampler will remain open source. Again, the commercial exception is just to
230 prevent commercial exploitation by third parties that haven't contributed anything to
231 open source projects.
232 </p>
233
234 <a name="ls_license_change"></a>
235 <h3>I've heard the commercial exception of LinuxSampler was added at a certain version?</h3>
236 <p class="default">
237 No, the commercial exception in LinuxSampler's license terms were there since day one.
238 Even further it's not only there since the very first publicly available CVS
239 (developer) version of LinuxSampler, that commercial exception was even already in
240 Benno Senoner's proof of concept code called "EVO", which LinuxSampler was based on.
241 There was even a rumour that we would have manipulated CVS history to "pretend" this
242 exception wasn't added at a later point. Needless to say that this rumour is completely
243 false as well. Think about it! We're a group of developers spread around the world who
244 work on this project for fun and ideology in our spare time. Most of us contributed to
245 various other open source / free software projects. Do you seriously think we would
246 cheat on such an issue? Beside that you certainly find various people completely
247 unrelated to this project who still have early versions of LinuxSampler and / or EVO
248 and thus can confirm that this commercial exception was always there.
249 </p>
250
251 <a name="ls_breaking_libgig_license"></a>
252 <h3>Doesn't LinuxSampler illegally link against libgig?</h3>
253 <p class="default">
254 No! LinuxSampler does not "illegally" link against libgig, since the copyright holder
255 (in this case of libgig) has all rights of his work and thus is not bound to his own
256 license terms. The sole purpose of license terms is to grant other people certain
257 rights to use the work.
258 </p>
259
260 <a name="ls_breaking_license"></a>
261 <h3>Doesn't LinuxSampler illegally link against other libraries?</h3>
262 <p class="default">
263 No, the only library LinuxSampler links to that has license restrictions regarding
264 linking is libgig (<a href="#ls_breaking_libgig_license">see above</a>). Especially
265 LinuxSampler does not break Qt's license terms, since it does not link against Qt at
266 all.
267 </p>
268
269 <a name="aga"></a>
270 <h3>linuxsampler? qsampler? jsampler? gigedit? libgig? liblscp? jlscp? ... hu?</h3>
271 <p class="default">
272 There are currently seven subprojects in the LinuxSampler project; jlscp, jsampler,
273 libgig, liblscp, linuxsampler, gigedit and qsampler. linuxsampler is the core of the sampler, it includes the
274 sampler engines and audio and MIDI drivers. linuxsampler itself is decoupled from any
275 user interface. It offers a native C++ API as well as a network server (LSCP server) to allow to be controlled by
276 an arbitrary user frontend from an arbitrary place over a network connection or
277 (of course) locally from the same machine as well. This decoupled /
278 <a href="http://en.wikipedia.org/wiki/Backend">"backend"</a> design
279 of the sampler allows to run it even on a machine without any graphical interface,
280 without a Desktop, the machine doesn't even have to have a graphics card!
281 qsampler is the first <a href="http://en.wikipedia.org/wiki/Graphical_user_interface">GUI</a>
282 <a href="http://en.wikipedia.org/wiki/Frontend">frontend</a>
283 written for linuxsampler, it is written in C++ using the Qt
284 GUI library and thus can be compiled for various architectures and operating systems
285 without modifications of the source code.
286 gigedit is an instruments editor application for Gigasampler format files. You can
287 run it as stand-alone application or in conjunction with LinuxSampler. In the latter
288 case you can play and immediately hear all your modifications made with gigedit in
289 realtime.
290 libgig is a C++ library written for accessing Gigasampler files and DLS Level 1 and 2
291 files, that is for reading and (since version 3.0.0) also writing of those files.
292 libgig is used by linuxsampler to load Gigasampler files, it is used by gigedit to
293 load, modify and create new Gigasampler files and it <b>can</b> be
294 used by qsampler to retrieve additional informations about Gigasampler files. liblscp
295 is a C library written as a wrapper around the LSCP network protocol, thus to control
296 linuxsampler. It was originally designed to be used on both sides, that is on server /
297 backend side (linuxsampler) and on client / frontend side (e.g. qsampler). But it's now
298 only used on client side by qsampler at the moment. jsampler is another GUI frontend for
299 linuxsampler, it's written in Java and thus platform independent. jlscp is a library which
300 can be compared with liblscp, with the only difference that jlscp is written in Java and
301 liblscp in C. jsampler requires jlscp.
302
303 </p>
304
305 <a name="install"></a>
306 <h3>What do I need to compile and install?</h3>
307 <p class="default">
308 You should compile and install at least libgig and linuxsampler. As a beginner you should
309 definitely as well compile and install a convenient GUI frontend like either qsampler or
310 jsampler, whatever you prefer. qsampler depends on liblscp, so you have to
311 compile and install liblscp before starting to build qsampler. Also if you like to be
312 able to edit instruments, you should compile and install gigedit as well. The recommended
313 order to compile and install is:
314 <ol class="default">
315 <li>libgig</li>
316 <li>linuxsampler</li>
317 <li>gigedit</li>
318 <li>liblscp</li>
319 <li>qsampler</li>
320 </ol>
321 </p>
322 <p class="default">
323 Of course you can also install QSampler and JSampler side by side. So you can test and use
324 both at the same time.
325 </p>
326
327 <a name="compilarion_error"></a>
328 <h3>Compilation of LinuxSampler aborts with ... </h3>
329
330 <p class="default">
331 &bull;&nbsp;&nbsp;&nbsp;"<code>Required libgig version not found...</code>"<br>
332 <br>
333 This error might occur when running LinuxSampler's configure script. Make sure
334 you have the required libgig version installed. If you're compiling a Subversion
335 version of LinuxSampler you usually have to compile and install the current
336 Subversion version of libgig as well. Also note there are couple common mistakes
337 which let this error occur even after having compiled and installed the required
338 libgig version. Read
339 <a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=29">this bug report</a>
340 about common mistakes and how you can fix them.
341 </p>
342
343 <p class="default">
344 &bull;&nbsp;&nbsp;&nbsp;"<code>can't find a register in class `GENERAL_REGS' while reloading `asm'</code>"<br>
345 <br>
346 This is caused by the inline assembly code for
347 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
348 linuxsampler. You have to compile older versions of LinuxSampler (v0.3.3 and older) with
349 -O2 or -O3 to avoid this problem. Usually this is done by default, if not try:
350 <br>
351 </p>
352 <pre class="code">CXXFLAGS="-O3" ./configure
353 make</pre>
354 <p class="default">
355 Alternatively you could also disable all hand-crafted assembly optimization code by:
356 </p>
357 <pre class="code">./configure --disable-asm
358 make</pre>
359 <p class="default">
360 but the latter is definitely not recommended, as it will increase CPU usage a lot!
361 </p>
362
363 <p class="default">
364 &bull;&nbsp;&nbsp;&nbsp;"<code>../common/Resampler.h:142: error: memory input 2 is not directly addressable</code>"<br>
365 <br>
366 This was reported (<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9018347&forum_id=12792">1</a>,
367 <a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9019467&forum_id=12792">2</a>)
368 to be a gcc/g++ version problem, in conjunction with the inline assembly code for
369 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
370 linuxsampler. Make sure you got gcc and g++, both of version 3.3 or higher installed.
371 You can check this with:
372 </p>
373 <pre class="code">gcc --version
374 g++ --version</pre>
375 <p class="default">
376 In case you already got gcc and g++ of version 3.3 or higher
377 installed and it still causes the compilation error mentioned
378 above, try the following:
379 </p>
380 <pre class="code">export CC=`which gcc`
381 export CXX=`which g++`</pre>
382 <p class="default">
383 On certain systems however you still get this error in conjunction with older
384 versions of LinuxSampler (v0.3.3 and older). Fortunately newer versions of
385 linuxsampler are not affected anymore
386 (<a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=34">read this for details</a>).
387 </p>
388
389 <a name="svn_checkout"></a>
390 <h3>How do I checkout from Subversion?</h3>
391 <p class="default">
392 The procedure of checking out the newest version from Subversion is described on the
393 <a href="downloads.html#svn">Downloads</a> site and on the
394 <a href="http://svn.linuxsampler.org/cgi-bin/viewvc.cgi/">web interface site
395 of our Subversion server</a>.
396 </p>
397
398 <a name="compile_svn"></a>
399 <h3>How do I compile from Subversion?</h3>
400 <p class="default">
401 The procedure for compiling from Subversion is the same for all subprojects, that is no matter
402 if you are compiling linuxsampler, qsampler, libgig or liblscp from Subversion, you need to
403 have the autotools (automake, autoconf and libtool) installed and compile it that way:
404 <pre class="code">make -f Makefile.cvs
405 ./configure
406 make</pre>
407 </p>
408
409 <a name="no_gui"></a>
410 <h3>Can I use linuxsampler without a GUI as well?</h3>
411 <p class="default">
412 Yes, but unfortunately there is no console based frontend for linuxsampler (yet).
413 You have to write LSCP scripts and send it to the running linuxsampler application. But
414 don't worry, if you don't know how to write LSCP scripts, you can also start by saving
415 a sampler session with QSampler, because the session files qsampler writes are actually
416 real LSCP scripts. You can send a LSCP script to linuxsampler on the console with the
417 following command:
418 </p>
419 <pre class="code">netcat localhost 8888 &lt; yourscript.lscp</pre>
420 <p class="default">
421 or on certain systems (like Debian) you have to provide the -t switch:
422 </p>
423 <pre class="code">netcat -t localhost 8888 &lt; yourscript.lscp</pre>
424 <p class="default">
425 Of course you can also replace localhost by the IP address of the machine where
426 linuxsampler is running. Alternatively you can also make a telnet connection (port 8888)
427 to linuxsampler's LSCP server and type commands manually.
428 </p>
429
430 <a name="examples_lscp"></a>
431 <h3>Are there example LSCP script files somewhere?</h3>
432 <p class="default">
433 Yes, have a look on the <a href="documentation.html">Documentation</a> site for some
434 common LSCP script examples. For details about LSCP read the
435 <a href="api/draft-linuxsampler-protocol.html">LSCP reference</a>. Be welcome to ask
436 questions for details about LSCP on the
437 <a href="http://lists.sourceforge.net/lists/listinfo/linuxsampler-devel">mailing list</a>.
438 </p>
439
440 <a name="dropouts"></a>
441 <h3>I get dropouts (click sounds, noise), what can I do about it?</h3>
442 <p class="default">
443 In order to achieve good results under Linux you need to have a
444 <a href="http://www.linuxdj.com/audio/lad/resourceslatency.php3">patched kernel</a>.
445 There are different patches available depending on what version (2.4.x or 2.6.x) of kernel you use.
446 The <a href="http://jackaudio.org/faq">JACK FAQ site</a>
447 (or the <a href="http://jackit.sourceforge.net/docs/faq.php">old JACK FAQ site</a>)
448 is also a good resource for
449 how to configure a realtime stable kernel. But note; LinuxSampler currently has not support for
450 libcap yet, that means if you are still using a 2.4.x Linux kernel you most probably have to run
451 LinuxSampler with root priviliges. As a rule of thumb: if you don't get warnings like "cannot
452 mlockall() memory" on the console, you are safe to run it as ordinary user as well.
453 </p>
454
455 <a name="runtime_error"></a>
456 <h3>LinuxSampler aborts at runtime with ... </h3>
457 <p class="default">
458 Note: For <b>Windows specific runtime errors</b>, please have a
459 look at the
460 <a href="windows.html#houston">Trouble Shooting</a> section of
461 the LinuxSampler Windows HOWTO.
462 </p>
463
464 <p class="default">
465 &bull;&nbsp;&nbsp;&nbsp;"<code>gig::Engine error: Failed to
466 load instrument, cause: Unknown exception while trying to
467 parse gig file.</code>"<br>
468 <br>
469 Usually LS gives you a meaningful error message in case it
470 failed to load an instrument. However there might be rare
471 cases where LS cannot resolve the reason and you get an
472 error message like above. In this case make sure security /
473 user limits aren't set too low. You can list your current
474 limits with:
475 </p>
476 <pre class="code">ulimit -a</pre>
477 <p class="default">
478 Usually most of those settings are set to "unlimited" on
479 most boxes. If this is not the case on yours, make sure that
480 at least the limits for "max locked memory", "virtual
481 memory" and "data seg size" are sufficiently high enough.
482 The exact value depends on the instruments you want to load.
483 If your security policy allows it, you could simply set
484 those limits to "unlimited" (see also config file
485 /etc/security/limits.conf and
486 <a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=41">bug report #41</a>).
487 </p>
488
489 </div>
490 </td></tr></table>
491
492 </div>
493
494 </body>
495 </html>

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