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5 <title>The Linux Sampler Project</title>
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100
101 <div id="mainwindow"><img name="LinuxSampler" src="gfx/lsbackground.jpg" alt="LinuxSampler">
102
103 <h1><span class="hidden">The LinuxSampler Project</span></h1>
104
105 <table border=0 cellspacing=0 cellpadding=0><tr><th colspan=2 align=left>
106 <img name="h1blank" src="gfx/h1blank.png" alt="blank"><span class="hidden">about</span></th></tr>
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121 </td><td valign=top width="100%">
122 <div id="contents">
123
124 <h2>FAQ</h2>
125 <p class="default">
126 Here is a collection of frequently asked questions. Please read them before asking on
127 the mailing list.<br>
128 <ol class="default">
129 <li>
130 <a href="#commercial_products">Can I use LinuxSampler in commercial hardware or software products?</a>
131 </li>
132 <li>
133 <a href="#commercial_music">Can I use LinuxSampler for commercial music production?</a>
134 </li>
135 <li>
136 <a href="#open_source">LinuxSampler is not open source, you are evil!</a>
137 </li>
138 <li>
139 <a href="#aga">linuxsampler? qsampler? jsampler? libgig? liblscp? jlscp? ... hu?</a>
140 </li>
141 <li>
142 <a href="#install">What do I need to compile and install?</a>
143 </li>
144 <li>
145 <a href="#compilarion_error">Compilation of LinuxSampler aborts with ...</a>
146 </li>
147 <li>
148 <a href="#cvs_checkout">How do I checkout from CVS?</a>
149 </li>
150 <li>
151 <a href="#compile_cvs">How do I compile from CVS?</a>
152 </li>
153 <li>
154 <a href="#no_gui">Can I use linuxsampler without a GUI as well?</a>
155 </li>
156 <li>
157 <a href="#examples_lscp">Are there example LSCP script files somewhere?</a>
158 </li>
159 <li>
160 <a href="#dropouts">I get dropouts (click sounds, noise), what can I do about it?</a>
161 </li>
162 </ol>
163 </p>
164
165 <a name="commercial_products"></a>
166 <h3>Can I use LinuxSampler in commercial hardware or software products?</h3>
167 <p class="default">
168 You are NOT ALLOWED to use LinuxSampler source code, libraries or applications in
169 COMMERCIAL hardware or software products without prior written authorization by the
170 <a href="developers.html">authors</a>. <A HREF="downloads.html">See here</A>
171 </p>
172
173 <a name="commercial_music"></a>
174 <h3>Can I use LinuxSampler for commercial music production?</h3>
175 <p class="default">
176 Hell, yes! Every indirect commercial usage of LinuxSampler, which essentially means
177 using its audio output, can of course be used in commercial applications like music
178 productions, live shows, etc. Don't get us wrong, with the mentioned commercial
179 exception we don't want to restrict the normal user / musician, we just want to avoid
180 somebody to directly make money with our work, that is by selling our software in a
181 sampler product like a sampler + sample library bundle, a hardware sampler or
182 something equivalent, at least not without giving something back to the open source
183 Community.
184 </p>
185
186 <a name="open_source"></a>
187 <h3>LinuxSampler is not open source, you are evil!</h3>
188 <p class="default">
189 There are of course many definitions of the term "open source", but according to the
190 <a href="http://en.wikipedia.org/wiki/Open_source">definition on Wikipedia</a>
191 LinuxSampler is in fact open source, since you've got complete access to its source
192 code. So due to this fact, a normal user / musician is free to do with LinuxSampler
193 what he likes to do, he can even adjust and tweak every single part of the software
194 by modifying and compiling its source code. And just the fact that we want to avoid
195 our work to be directly exploited in commercial software or hardware products is
196 definitely not an "evil" intention. For the normal user / musician the commercial
197 restriction is even an advantage, since that way commercial actors are forced to
198 support this or another open source project either directly by coding or indirectly
199 by funding and thus increase development speed.
200 </p>
201
202 <a name="aga"></a>
203 <h3>linuxsampler? qsampler? jsampler? libgig? liblscp? jlscp? ... hu?</h3>
204 <p class="default">
205 There are currently six subprojects in the LinuxSampler project; jlscp, jsampler,
206 libgig, liblscp, linuxsampler and qsampler. linuxsampler is the core of the sampler, it includes the
207 sampler engines and audio and MIDI drivers. linuxsampler itself is decoupled from any
208 user interface. It offers a native C++ API as well as a network server (LSCP server) to allow to be controlled by
209 an arbitrary user frontend from an arbitrary place over a network connection or
210 locally from the same machine as well.
211 qsampler is the first GUI frontend written for linuxsampler, it is written in C++ using the Qt
212 GUI library and thus can be compiled for various architectures and operating systems
213 without modifications of the source code.
214 libgig is a C++ library written for accessing Gigasampler files and DLS Level 1 and 2
215 files, that is for reading and (since version 3.0.0) also writing of those files.
216 libgig is used by linuxsampler to load Gigasampler files and it <b>can</b> be
217 used by qsampler to retrieve additional informations about Gigasampler files. liblscp
218 is a C library written as a wrapper around the LSCP network protocol, thus to control
219 linuxsampler. It was originally designed to be used on both sides, that is on server /
220 backend side (linuxsampler) and on client / frontend side (e.g. qsampler). But it's now
221 only used on client side by qsampler at the moment. jsampler is another GUI frontend for
222 linuxsampler, it's written in Java and thus platform independent. jlscp is a library which
223 can be compared with liblscp, with the only difference that jlscp is written in Java and
224 liblscp in C. jsampler requires jlscp.
225
226 </p>
227
228 <a name="install"></a>
229 <h3>What do I need to compile and install?</h3>
230 <p class="default">
231 You should compile and install at least libgig and linuxsampler. As a beginner you should
232 definitely as well compile and install a convenient GUI frontend like either qsampler or
233 jsampler, whatever you prefer. qsampler depends on liblscp, so you have to
234 compile and install liblscp before starting to build qsampler. The recommended order to
235 compile and install is:
236 <ol class="default">
237 <li>libgig</li>
238 <li>linuxsampler</li>
239 <li>liblscp</li>
240 <li>qsampler</li>
241 </ol>
242 </p>
243
244 <a name="compilarion_error"></a>
245 <h3>Compilation of LinuxSampler aborts with ... </h3>
246 <p class="default">
247 &bull;&nbsp;&nbsp;&nbsp;"<code>can't find a register in class `GENERAL_REGS' while reloading `asm'</code>"<br>
248 <br>
249 This is caused by the inline assembly code for
250 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
251 linuxsampler. You have to compile older versions of LinuxSampler (v0.3.3 and older) with
252 -O2 or -O3 to avoid this problem. Usually this is done by default, if not try:
253 <br>
254 </p>
255 <pre class="code">CXXFLAGS="-O3" ./configure
256 make</pre>
257 <p class="default">
258 Alternatively you could also disable all hand-crafted assembly optimization code by:
259 </p>
260 <pre class="code">./configure --disable-asm
261 make</pre>
262 <p class="default">
263 but the latter is definitely not recommended, as it will increase CPU usage a lot!
264 </p>
265
266 <p class="default">
267 &bull;&nbsp;&nbsp;&nbsp;"<code>../common/Resampler.h:142: error: memory input 2 is not directly addressable</code>"<br>
268 <br>
269 This was reported (<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9018347&forum_id=12792">1</a>,
270 <a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9019467&forum_id=12792">2</a>)
271 to be a gcc/g++ version problem, in conjunction with the inline assembly code for
272 <a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of
273 linuxsampler. Make sure you got gcc and g++, both of version 3.3 or higher installed.
274 You can check this with:
275 </p>
276 <pre class="code">gcc --version
277 g++ --version</pre>
278 <p class="default">
279 In case you already got gcc and g++ of version 3.3 or higher
280 installed and it still causes the compilation error mentioned
281 above, try the following:
282 </p>
283 <pre class="code">export CC=`which gcc`
284 export CXX=`which g++`</pre>
285 <p class="default">
286 On certain systems however you still get this error in conjunction with older
287 versions of LinuxSampler (v0.3.3 and older). Fortunately newer versions of
288 linuxsampler are not affected anymore
289 (<a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=34">read this for details</a>).
290 </p>
291
292 <a name="cvs_checkout"></a>
293 <h3>How do I checkout from CVS?</h3>
294 <p class="default">
295 The procedure of checking out the newest version from CVS is described on the
296 <a href="downloads.html#cvs">Downloads</a> site and on the
297 <a href="http://cvs.linuxsampler.org/cgi-bin/viewcvs.cgi/">web interface site
298 of our CVS server</a>.
299 </p>
300
301 <a name="compile_cvs"></a>
302 <h3>How do I compile from CVS?</h3>
303 <p class="default">
304 The procedure for compiling from CVS is the same for all subprojects, that is no matter
305 if you are compiling linuxsampler, qsampler, libgig or liblscp from CVS, you need to
306 have the autotools (automake, autoconf and libtool) installed and compile it that way:
307 <pre class="code">make -f Makefile.cvs
308 ./configure
309 make</pre>
310 </p>
311
312 <a name="no_gui"></a>
313 <h3>Can I use linuxsampler without a GUI as well?</h3>
314 <p class="default">
315 Yes, but unfortunately there is no console based frontend for linuxsampler (yet).
316 You have to write LSCP scripts and send it to the running linuxsampler application. But
317 don't worry, if you don't know how to write LSCP scripts, you can also start by saving
318 a sampler session with QSampler, because the session files qsampler writes are actually
319 real LSCP scripts. You can send a LSCP script to linuxsampler on the console with the
320 following command:
321 </p>
322 <pre class="code">cat yourscript.lscp | netcat localhost 8888</pre>
323 <p class="default">
324 or on certain systems (like Debian) you have to provide the -t switch:
325 </p>
326 <pre class="code">cat yourscript.lscp | netcat -t localhost 8888</pre>
327 <p class="default">
328 Of course you can also replace localhost by the IP address of the machine where
329 linuxsampler is running. Alternatively you can also make a telnet connection (port 8888)
330 to linuxsampler's LSCP server and type commands manually.
331 </p>
332
333 <a name="examples_lscp"></a>
334 <h3>Are there example LSCP script files somewhere?</h3>
335 <p class="default">
336 Yes, have a look on the <a href="documentation.html">Documentation</a> site for some
337 common LSCP script examples. For details about LSCP read the
338 <a href="api/draft-linuxsampler-protocol.html">LSCP reference</a>. Be welcome to ask
339 questions for details about LSCP on the
340 <a href="http://lists.sourceforge.net/lists/listinfo/linuxsampler-devel">mailing list</a>.
341 </p>
342
343 <a name="dropouts"></a>
344 <h3>I get dropouts (click sounds, noise), what can I do about it?</h3>
345 <p class="default">
346 In order to achieve good results under Linux you need to have a
347 <a href="http://www.linuxdj.com/audio/lad/resourceslatency.php3">patched kernel</a>.
348 There are different patches available depending on what version (2.4.x or 2.6.x) of kernel you use.
349 The <a href="http://jackaudio.org/faq">JACK FAQ site</a>
350 (or the <a href="http://jackit.sourceforge.net/docs/faq.php">old JACK FAQ site</a>)
351 is also a good resource for
352 how to configure a realtime stable kernel. But note; LinuxSampler currently has not support for
353 libcap yet, that means if you are still using a 2.4.x Linux kernel you most probably have to run
354 LinuxSampler with root priviliges. As a rule of thumb: if you don't get warnings like "cannot
355 mlockall() memory" on the console, you are safe to run it as ordinary user as well.
356 </p>
357
358 </div>
359 </td></tr></table>
360
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362
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