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106 <div id="mainwindow"><img name="LinuxSampler" src="gfx/lsbackground.jpg" alt="LinuxSampler">
107
108 <h1><span class="hidden">The LinuxSampler Project</span></h1>
109
110 <table border=0 cellspacing=0 cellpadding=0><tr><th colspan=2 align=left>
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145 <div id="contents">
146
147 <h2>FAQ</h2>
148 <div class="groupbox">
149 Here is a collection of frequently asked questions. Please read them before asking on
150 the mailing list.<br>
151 <br>
152 1.&nbsp;License<br>
153 &nbsp;&nbsp;&nbsp;&nbsp;1.1&nbsp;<a href="#commercial_products">Can I use LinuxSampler in commercial hardware or software products?</a><br>
154 &nbsp;&nbsp;&nbsp;&nbsp;1.2&nbsp;<a href="#commercial_music">Can I use LinuxSampler for commercial music production?</a><br>
155 &nbsp;&nbsp;&nbsp;&nbsp;1.3&nbsp;<a href="#open_source">LinuxSampler is not open source, you are evil!</a><br>
156 &nbsp;&nbsp;&nbsp;&nbsp;1.4&nbsp;<a href="#closed_source">Will LinuxSampler turn closed-source?</a><br>
157 &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>
158 &nbsp;&nbsp;&nbsp;&nbsp;1.6&nbsp;<a href="#ls_breaking_libgig_license">Doesn't LinuxSampler illegally link against libgig?</a><br>
159 &nbsp;&nbsp;&nbsp;&nbsp;1.7&nbsp;<a href="#ls_breaking_license">Doesn't LinuxSampler illegally link against other libraries?</a><br>
160 2.&nbsp;General Questions<br>
161 &nbsp;&nbsp;&nbsp;&nbsp;2.1&nbsp;<a href="#aga">linuxsampler? qsampler? jsampler? libgig? liblscp? jlscp? ... hu?</a><br>
162 &nbsp;&nbsp;&nbsp;&nbsp;2.2&nbsp;<a href="#no_gui">Can I use linuxsampler without a GUI as well?</a><br>
163 3.&nbsp;Compilation / Installation<br>
164 &nbsp;&nbsp;&nbsp;&nbsp;3.1&nbsp;<a href="#install">What do I need to compile and install?</a><br>
165 &nbsp;&nbsp;&nbsp;&nbsp;3.2&nbsp;<a href="#compilarion_error">Compilation of LinuxSampler aborts with ...</a><br>
166 &nbsp;&nbsp;&nbsp;&nbsp;3.3&nbsp;<a href="#cvs_checkout">How do I checkout from CVS?</a><br>
167 &nbsp;&nbsp;&nbsp;&nbsp;3.4&nbsp;<a href="#compile_cvs">How do I compile from CVS?</a><br>
168 4.&nbsp;Setup<br>
169 &nbsp;&nbsp;&nbsp;&nbsp;4.1&nbsp;<a href="#examples_lscp">Are there example LSCP script files somewhere?</a><br>
170 &nbsp;&nbsp;&nbsp;&nbsp;4.2&nbsp;<a href="#dropouts">I get dropouts (click sounds, noise), what can I do about it?</a><br>
171 &nbsp;&nbsp;&nbsp;&nbsp;4.3&nbsp;<a href="#runtime_error">LinuxSampler aborts at runtime with ...</a><br>
172 <br>
173 </div>
174
175 <a name="commercial_products"></a>
176 <h3>Can I use LinuxSampler in commercial hardware or software products?</h3>
177 <p class="default">
178 You are NOT ALLOWED to use LinuxSampler source code, libraries or applications in
179 COMMERCIAL hardware or software products without prior written authorization by the
180 <a href="developers.html">authors</a>. <A HREF="downloads.html">See here</A>
181 </p>
182
183 <a name="commercial_music"></a>
184 <h3>Can I use LinuxSampler for commercial music production?</h3>
185 <p class="default">
186 Hell, yes! Every indirect commercial usage of LinuxSampler, which essentially means
187 using its audio output, can of course be used in commercial applications like music
188 productions, live shows, etc. Don't get us wrong, with the mentioned commercial
189 exception we don't want to restrict the normal user / musician, we just want to avoid
190 somebody to directly make money with our work, that is by selling our software in a
191 sampler product like a sampler + sample library bundle, a hardware sampler or
192 something equivalent, at least not without giving something back to the open source
193 Community.
194 </p>
195
196 <a name="open_source"></a>
197 <h3>LinuxSampler is not open source, you are evil!</h3>
198 <p class="default">
199 There are of course many definitions of the term "open source", but according to the
200 <a href="http://en.wikipedia.org/wiki/Open_source">definition on Wikipedia</a>
201 LinuxSampler is in fact open source, since you've got complete access to its source
202 code. So due to this fact, a normal user / musician is free to do with LinuxSampler
203 what he likes to do, he can even adjust and tweak every single part of the software
204 by modifying and compiling its source code. And just the fact that we want to avoid
205 our work to be directly exploited in commercial software or hardware products is
206 definitely not an "evil" intention. For the normal user / musician the commercial
207 restriction is even an advantage, since that way commercial actors are forced to
208 support this or another open source project either directly by coding or indirectly
209 by funding and thus increase development speed.
210 </p>
211
212 <a name="closed_source"></a>
213 <h3>Will LinuxSampler turn closed-source?</h3>
214 <p class="default">
215 No, LinuxSampler will remain open source. Again, the commercial exception is just to
216 prevent commercial exploitation by third parties that haven't contributed anything to
217 open source projects.
218 </p>
219
220 <a name="ls_license_change"></a>
221 <h3>I've heard the commercial exception of LinuxSampler was added at a certain version?</h3>
222 <p class="default">
223 No, the commercial exception in LinuxSampler's license terms were there since day one.
224 Even further it's not only there since the very first publicly available CVS
225 (developer) version of LinuxSampler, that commercial exception was even already in
226 Benno Senoner's proof of concept code called "EVO", which LinuxSampler was based on.
227 There was even a rumour that we would have manipulated CVS history to "pretend" this
228 exception wasn't added at a later point. Needless to say that this rumour is completely
229 false as well. Think about it! We're a group of developers spread around the world who
230 work on this project for fun and ideology in our spare time. Most of us contributed to
231 various other open source / free software projects. Do you seriously think we would
232 cheat on such an issue? Beside that you certainly find various people completely
233 unrelated to this project who still have early versions of LinuxSampler and / or EVO
234 and thus can confirm that this commercial exception was always there.
235 </p>
236
237 <a name="ls_breaking_libgig_license"></a>
238 <h3>Doesn't LinuxSampler illegally link against libgig?</h3>
239 <p class="default">
240 No! LinuxSampler does not "illegally" link against libgig, since the copyright holder
241 (in this case of libgig) has all rights of his work and thus is not bound to his own
242 license terms. The sole purpose of license terms is to grant other people certain
243 rights to use the work.
244 </p>
245
246 <a name="ls_breaking_license"></a>
247 <h3>Doesn't LinuxSampler illegally link against other libraries?</h3>
248 <p class="default">
249 No, the only library LinuxSampler links to that has license restrictions regarding
250 linking is libgig (<a href="#ls_breaking_libgig_license">see above</a>). Especially
251 LinuxSampler does not break Qt's license terms, since it does not link against Qt at
252 all.
253 </p>
254
255 <a name="aga"></a>
256 <h3>linuxsampler? qsampler? jsampler? gigedit? libgig? liblscp? jlscp? ... hu?</h3>
257 <p class="default">
258 There are currently seven subprojects in the LinuxSampler project; jlscp, jsampler,
259 libgig, liblscp, linuxsampler, gigedit and qsampler. linuxsampler is the core of the sampler, it includes the
260 sampler engines and audio and MIDI drivers. linuxsampler itself is decoupled from any
261 user interface. It offers a native C++ API as well as a network server (LSCP server) to allow to be controlled by
262 an arbitrary user frontend from an arbitrary place over a network connection or
263 (of course) locally from the same machine as well. This decoupled /
264 <a href="http://en.wikipedia.org/wiki/Backend">"backend"</a> design
265 of the sampler allows to run it even on a machine without any graphical interface,
266 without a Desktop, the machine doesn't even have to have a graphics card!
267 qsampler is the first <a href="http://en.wikipedia.org/wiki/Graphical_user_interface">GUI</a>
268 <a href="http://en.wikipedia.org/wiki/Frontend">frontend</a>
269 written for linuxsampler, it is written in C++ using the Qt
270 GUI library and thus can be compiled for various architectures and operating systems
271 without modifications of the source code.
272 gigedit is an instruments editor application for Gigasampler format files. You can
273 run it as stand-alone application or in conjunction with LinuxSampler. In the latter
274 case you can play and immediately hear all your modifications made with gigedit in
275 realtime.
276 libgig is a C++ library written for accessing Gigasampler files and DLS Level 1 and 2
277 files, that is for reading and (since version 3.0.0) also writing of those files.
278 libgig is used by linuxsampler to load Gigasampler files, it is used by gigedit to
279 load, modify and create new Gigasampler files and it <b>can</b> be
280 used by qsampler to retrieve additional informations about Gigasampler files. liblscp
281 is a C library written as a wrapper around the LSCP network protocol, thus to control
282 linuxsampler. It was originally designed to be used on both sides, that is on server /
283 backend side (linuxsampler) and on client / frontend side (e.g. qsampler). But it's now
284 only used on client side by qsampler at the moment. jsampler is another GUI frontend for
285 linuxsampler, it's written in Java and thus platform independent. jlscp is a library which
286 can be compared with liblscp, with the only difference that jlscp is written in Java and
287 liblscp in C. jsampler requires jlscp.
288
289 </p>
290
291 <a name="install"></a>
292 <h3>What do I need to compile and install?</h3>
293 <p class="default">
294 You should compile and install at least libgig and linuxsampler. As a beginner you should
295 definitely as well compile and install a convenient GUI frontend like either qsampler or
296 jsampler, whatever you prefer. qsampler depends on liblscp, so you have to
297 compile and install liblscp before starting to build qsampler. Also if you like to be
298 able to edit instruments, you should compile and install gigedit as well. The recommended
299 order to compile and install is:
300 <ol class="default">
301 <li>libgig</li>
302 <li>linuxsampler</li>
303 <li>gigedit</li>
304 <li>liblscp</li>
305 <li>qsampler</li>
306 </ol>
307 </p>
308 <p class="default">
309 Of course you can also install QSampler and JSampler side by side. So you can test and use
310 both at the same time.
311 </p>
312
313 <a name="compilarion_error"></a>
314 <h3>Compilation of LinuxSampler aborts with ... </h3>
315
316 <p class="default">
317 &bull;&nbsp;&nbsp;&nbsp;"<code>Required libgig version not found...</code>"<br>
318 <br>
319 This error might occur when running LinuxSampler's configure script. Make sure
320 you have the required libgig version installed. If you're compiling a CVS
321 version of LinuxSampler you usually have to compile and install the current
322 CVS version of libgig as well. Also note there are couple common mistakes which
323 let this error occur even after having compiled and installed the required
324 libgig version. Read
325 <a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=29">this bug report</a>
326 about common mistakes and how you can fix them.
327 </p>
328
329 <p class="default">
330 &bull;&nbsp;&nbsp;&nbsp;"<code>can't find a register in class `GENERAL_REGS' while reloading `asm'</code>"<br>
331 <br>
332 This is caused by the inline assembly code for
333 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
334 linuxsampler. You have to compile older versions of LinuxSampler (v0.3.3 and older) with
335 -O2 or -O3 to avoid this problem. Usually this is done by default, if not try:
336 <br>
337 </p>
338 <pre class="code">CXXFLAGS="-O3" ./configure
339 make</pre>
340 <p class="default">
341 Alternatively you could also disable all hand-crafted assembly optimization code by:
342 </p>
343 <pre class="code">./configure --disable-asm
344 make</pre>
345 <p class="default">
346 but the latter is definitely not recommended, as it will increase CPU usage a lot!
347 </p>
348
349 <p class="default">
350 &bull;&nbsp;&nbsp;&nbsp;"<code>../common/Resampler.h:142: error: memory input 2 is not directly addressable</code>"<br>
351 <br>
352 This was reported (<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9018347&forum_id=12792">1</a>,
353 <a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9019467&forum_id=12792">2</a>)
354 to be a gcc/g++ version problem, in conjunction with the inline assembly code for
355 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
356 linuxsampler. Make sure you got gcc and g++, both of version 3.3 or higher installed.
357 You can check this with:
358 </p>
359 <pre class="code">gcc --version
360 g++ --version</pre>
361 <p class="default">
362 In case you already got gcc and g++ of version 3.3 or higher
363 installed and it still causes the compilation error mentioned
364 above, try the following:
365 </p>
366 <pre class="code">export CC=`which gcc`
367 export CXX=`which g++`</pre>
368 <p class="default">
369 On certain systems however you still get this error in conjunction with older
370 versions of LinuxSampler (v0.3.3 and older). Fortunately newer versions of
371 linuxsampler are not affected anymore
372 (<a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=34">read this for details</a>).
373 </p>
374
375 <a name="cvs_checkout"></a>
376 <h3>How do I checkout from CVS?</h3>
377 <p class="default">
378 The procedure of checking out the newest version from CVS is described on the
379 <a href="downloads.html#cvs">Downloads</a> site and on the
380 <a href="http://cvs.linuxsampler.org/cgi-bin/viewcvs.cgi/">web interface site
381 of our CVS server</a>.
382 </p>
383
384 <a name="compile_cvs"></a>
385 <h3>How do I compile from CVS?</h3>
386 <p class="default">
387 The procedure for compiling from CVS is the same for all subprojects, that is no matter
388 if you are compiling linuxsampler, qsampler, libgig or liblscp from CVS, you need to
389 have the autotools (automake, autoconf and libtool) installed and compile it that way:
390 <pre class="code">make -f Makefile.cvs
391 ./configure
392 make</pre>
393 </p>
394
395 <a name="no_gui"></a>
396 <h3>Can I use linuxsampler without a GUI as well?</h3>
397 <p class="default">
398 Yes, but unfortunately there is no console based frontend for linuxsampler (yet).
399 You have to write LSCP scripts and send it to the running linuxsampler application. But
400 don't worry, if you don't know how to write LSCP scripts, you can also start by saving
401 a sampler session with QSampler, because the session files qsampler writes are actually
402 real LSCP scripts. You can send a LSCP script to linuxsampler on the console with the
403 following command:
404 </p>
405 <pre class="code">netcat localhost 8888 &lt; yourscript.lscp</pre>
406 <p class="default">
407 or on certain systems (like Debian) you have to provide the -t switch:
408 </p>
409 <pre class="code">netcat -t localhost 8888 &lt; yourscript.lscp</pre>
410 <p class="default">
411 Of course you can also replace localhost by the IP address of the machine where
412 linuxsampler is running. Alternatively you can also make a telnet connection (port 8888)
413 to linuxsampler's LSCP server and type commands manually.
414 </p>
415
416 <a name="examples_lscp"></a>
417 <h3>Are there example LSCP script files somewhere?</h3>
418 <p class="default">
419 Yes, have a look on the <a href="documentation.html">Documentation</a> site for some
420 common LSCP script examples. For details about LSCP read the
421 <a href="api/draft-linuxsampler-protocol.html">LSCP reference</a>. Be welcome to ask
422 questions for details about LSCP on the
423 <a href="http://lists.sourceforge.net/lists/listinfo/linuxsampler-devel">mailing list</a>.
424 </p>
425
426 <a name="dropouts"></a>
427 <h3>I get dropouts (click sounds, noise), what can I do about it?</h3>
428 <p class="default">
429 In order to achieve good results under Linux you need to have a
430 <a href="http://www.linuxdj.com/audio/lad/resourceslatency.php3">patched kernel</a>.
431 There are different patches available depending on what version (2.4.x or 2.6.x) of kernel you use.
432 The <a href="http://jackaudio.org/faq">JACK FAQ site</a>
433 (or the <a href="http://jackit.sourceforge.net/docs/faq.php">old JACK FAQ site</a>)
434 is also a good resource for
435 how to configure a realtime stable kernel. But note; LinuxSampler currently has not support for
436 libcap yet, that means if you are still using a 2.4.x Linux kernel you most probably have to run
437 LinuxSampler with root priviliges. As a rule of thumb: if you don't get warnings like "cannot
438 mlockall() memory" on the console, you are safe to run it as ordinary user as well.
439 </p>
440
441 <a name="runtime_error"></a>
442 <h3>LinuxSampler aborts at runtime with ... </h3>
443 <p class="default">
444 Note: For <b>Windows specific runtime errors</b>, please have a
445 look at the
446 <a href="windows.html#houston">Trouble Shooting</a> section of
447 the LinuxSampler Windows HOWTO.
448 </p>
449
450 <p class="default">
451 &bull;&nbsp;&nbsp;&nbsp;"<code>gig::Engine error: Failed to
452 load instrument, cause: Unknown exception while trying to
453 parse gig file.</code>"<br>
454 <br>
455 Usually LS gives you a meaningful error message in case it
456 failed to load an instrument. However there might be rare
457 cases where LS cannot resolve the reason and you get an
458 error message like above. In this case make sure security /
459 user limits aren't set too low. You can list your current
460 limits with:
461 </p>
462 <pre class="code">ulimit -a</pre>
463 <p class="default">
464 Usually most of those settings are set to "unlimited" on
465 most boxes. If this is not the case on yours, make sure that
466 at least the limits for "max locked memory", "virtual
467 memory" and "data seg size" are sufficiently high enough.
468 The exact value depends on the instruments you want to load.
469 If your security policy allows it, you could simply set
470 those limits to "unlimited" (see also config file
471 /etc/security/limits.conf and
472 <a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=41">bug report #41</a>).
473 </p>
474
475 </div>
476 </td></tr></table>
477
478 </div>
479
480 </body>
481 </html>

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