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<div id="mainwindow"><img name="LinuxSampler" src="gfx/lsbackground.jpg" alt="LinuxSampler"> |
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<h1><span class="hidden">The LinuxSampler Project</span></h1> |
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<table border=0 cellspacing=0 cellpadding=0><tr><th colspan=2 align=left> |
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<img name="h1blank" src="gfx/h1blank.png" alt="blank"><span class="hidden">about</span></th></tr> |
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</td><td valign=top width="100%"> |
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<div id="contents"> |
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|
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<h2>FAQ</h2> |
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<div class="groupbox"> |
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Here is a collection of frequently asked questions. Please read them before asking on |
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the mailing list.<br> |
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<br> |
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1. License<br> |
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1.1 <a href="#commercial_products">Can I use LinuxSampler in commercial hardware or software products?</a><br> |
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1.2 <a href="#commercial_music">Can I use LinuxSampler for commercial music production?</a><br> |
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1.3 <a href="#open_source">LinuxSampler is not open source, you are evil!</a><br> |
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1.4 <a href="#closed_source">Will LinuxSampler turn closed-source?</a><br> |
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1.5 <a href="#ls_license_change">I've heard the commercial exception of LinuxSampler was added at a certain version?</a><br> |
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1.6 <a href="#ls_breaking_libgig_license">Doesn't LinuxSampler illegally link against libgig?</a><br> |
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1.7 <a href="#ls_breaking_license">Doesn't LinuxSampler illegally link against other libraries?</a><br> |
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2. General Questions<br> |
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2.1 <a href="#aga">linuxsampler? qsampler? jsampler? libgig? liblscp? jlscp? ... hu?</a><br> |
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2.2 <a href="#no_gui">Can I use linuxsampler without a GUI as well?</a><br> |
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3. Compilation / Installation<br> |
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3.1 <a href="#install">What do I need to compile and install?</a><br> |
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3.2 <a href="#compilarion_error">Compilation of LinuxSampler aborts with ...</a><br> |
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3.3 <a href="#cvs_checkout">How do I checkout from CVS?</a><br> |
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3.4 <a href="#compile_cvs">How do I compile from CVS?</a><br> |
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4. Setup<br> |
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4.1 <a href="#examples_lscp">Are there example LSCP script files somewhere?</a><br> |
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4.2 <a href="#dropouts">I get dropouts (click sounds, noise), what can I do about it?</a><br> |
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4.3 <a href="#runtime_error">LinuxSampler aborts at runtime with ...</a><br> |
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<br> |
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</div> |
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|
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<a name="commercial_products"></a> |
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<h3>Can I use LinuxSampler in commercial hardware or software products?</h3> |
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<p class="default"> |
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You are NOT ALLOWED to use LinuxSampler source code, libraries or applications in |
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COMMERCIAL hardware or software products without prior written authorization by the |
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<a href="developers.html">authors</a>. <A HREF="downloads.html">See here</A> |
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</p> |
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|
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<a name="commercial_music"></a> |
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<h3>Can I use LinuxSampler for commercial music production?</h3> |
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<p class="default"> |
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Hell, yes! Every indirect commercial usage of LinuxSampler, which essentially means |
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using its audio output, can of course be used in commercial applications like music |
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productions, live shows, etc. Don't get us wrong, with the mentioned commercial |
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exception we don't want to restrict the normal user / musician, we just want to avoid |
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somebody to directly make money with our work, that is by selling our software in a |
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sampler product like a sampler + sample library bundle, a hardware sampler or |
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something equivalent, at least not without giving something back to the open source |
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Community. |
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</p> |
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|
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<a name="open_source"></a> |
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<h3>LinuxSampler is not open source, you are evil!</h3> |
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<p class="default"> |
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There are of course many definitions of the term "open source", but according to the |
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<a href="http://en.wikipedia.org/wiki/Open_source">definition on Wikipedia</a> |
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LinuxSampler is in fact open source, since you've got complete access to its source |
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code. So due to this fact, a normal user / musician is free to do with LinuxSampler |
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what he likes to do, he can even adjust and tweak every single part of the software |
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by modifying and compiling its source code. And just the fact that we want to avoid |
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our work to be directly exploited in commercial software or hardware products is |
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definitely not an "evil" intention. For the normal user / musician the commercial |
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restriction is even an advantage, since that way commercial actors are forced to |
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support this or another open source project either directly by coding or indirectly |
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by funding and thus increase development speed. |
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</p> |
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|
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<a name="closed_source"></a> |
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<h3>Will LinuxSampler turn closed-source?</h3> |
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<p class="default"> |
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No, LinuxSampler will remain open source. Again, the commercial exception is just to |
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prevent commercial exploitation by third parties that haven't contributed anything to |
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open source projects. |
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</p> |
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|
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<a name="ls_license_change"></a> |
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<h3>I've heard the commercial exception of LinuxSampler was added at a certain version?</h3> |
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<p class="default"> |
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No, the commercial exception in LinuxSampler's license terms were there since day one. |
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Even further it's not only there since the very first publicly available CVS |
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(developer) version of LinuxSampler, that commercial exception was even already in |
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Benno Senoner's proof of concept code called "EVO", which LinuxSampler was based on. |
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There was even a rumour that we would have manipulated CVS history to "pretend" this |
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exception wasn't added at a later point. Needless to say that this rumour is completely |
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false as well. Think about it! We're a group of developers spread around the world who |
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work on this project for fun and ideology in our spare time. Most of us contributed to |
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various other open source / free software projects. Do you seriously think we would |
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cheat on such an issue? Beside that you certainly find various people completely |
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unrelated to this project who still have early versions of LinuxSampler and / or EVO |
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and thus can confirm that this commercial exception was always there. |
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</p> |
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|
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<a name="ls_breaking_libgig_license"></a> |
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<h3>Doesn't LinuxSampler illegally link against libgig?</h3> |
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<p class="default"> |
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No! LinuxSampler does not "illegally" link against libgig, since the copyright holder |
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(in this case of libgig) has all rights of his work and thus is not bound to his own |
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license terms. The sole purpose of license terms is to grant other people certain |
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rights to use the work. |
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</p> |
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|
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<a name="ls_breaking_license"></a> |
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<h3>Doesn't LinuxSampler illegally link against other libraries?</h3> |
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<p class="default"> |
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No, the only library LinuxSampler links to that has license restrictions regarding |
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linking is libgig (<a href="#ls_breaking_libgig_license">see above</a>). Especially |
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LinuxSampler does not break Qt's license terms, since it does not link against Qt at |
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all. |
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</p> |
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|
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<a name="aga"></a> |
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<h3>linuxsampler? qsampler? jsampler? gigedit? libgig? liblscp? jlscp? ... hu?</h3> |
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<p class="default"> |
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There are currently seven subprojects in the LinuxSampler project; jlscp, jsampler, |
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libgig, liblscp, linuxsampler, gigedit and qsampler. linuxsampler is the core of the sampler, it includes the |
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sampler engines and audio and MIDI drivers. linuxsampler itself is decoupled from any |
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user interface. It offers a native C++ API as well as a network server (LSCP server) to allow to be controlled by |
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an arbitrary user frontend from an arbitrary place over a network connection or |
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(of course) locally from the same machine as well. This decoupled / |
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<a href="http://en.wikipedia.org/wiki/Backend">"backend"</a> design |
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of the sampler allows to run it even on a machine without any graphical interface, |
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without a Desktop, the machine doesn't even have to have a graphics card! |
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qsampler is the first <a href="http://en.wikipedia.org/wiki/Graphical_user_interface">GUI</a> |
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<a href="http://en.wikipedia.org/wiki/Frontend">frontend</a> |
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written for linuxsampler, it is written in C++ using the Qt |
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GUI library and thus can be compiled for various architectures and operating systems |
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without modifications of the source code. |
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gigedit is an instruments editor application for Gigasampler format files. You can |
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run it as stand-alone application or in conjunction with LinuxSampler. In the latter |
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case you can play and immediately hear all your modifications made with gigedit in |
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realtime. |
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libgig is a C++ library written for accessing Gigasampler files and DLS Level 1 and 2 |
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files, that is for reading and (since version 3.0.0) also writing of those files. |
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libgig is used by linuxsampler to load Gigasampler files, it is used by gigedit to |
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load, modify and create new Gigasampler files and it <b>can</b> be |
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used by qsampler to retrieve additional informations about Gigasampler files. liblscp |
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is a C library written as a wrapper around the LSCP network protocol, thus to control |
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linuxsampler. It was originally designed to be used on both sides, that is on server / |
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backend side (linuxsampler) and on client / frontend side (e.g. qsampler). But it's now |
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only used on client side by qsampler at the moment. jsampler is another GUI frontend for |
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linuxsampler, it's written in Java and thus platform independent. jlscp is a library which |
| 293 |
can be compared with liblscp, with the only difference that jlscp is written in Java and |
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liblscp in C. jsampler requires jlscp. |
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|
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</p> |
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|
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<a name="install"></a> |
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<h3>What do I need to compile and install?</h3> |
| 300 |
<p class="default"> |
| 301 |
You should compile and install at least libgig and linuxsampler. As a beginner you should |
| 302 |
definitely as well compile and install a convenient GUI frontend like either qsampler or |
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jsampler, whatever you prefer. qsampler depends on liblscp, so you have to |
| 304 |
compile and install liblscp before starting to build qsampler. Also if you like to be |
| 305 |
able to edit instruments, you should compile and install gigedit as well. The recommended |
| 306 |
order to compile and install is: |
| 307 |
<ol class="default"> |
| 308 |
<li>libgig</li> |
| 309 |
<li>linuxsampler</li> |
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<li>gigedit</li> |
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<li>liblscp</li> |
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<li>qsampler</li> |
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</ol> |
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</p> |
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<p class="default"> |
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Of course you can also install QSampler and JSampler side by side. So you can test and use |
| 317 |
both at the same time. |
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</p> |
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|
| 320 |
<a name="compilarion_error"></a> |
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<h3>Compilation of LinuxSampler aborts with ... </h3> |
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|
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<p class="default"> |
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• "<code>Required libgig version not found...</code>"<br> |
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<br> |
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This error might occur when running LinuxSampler's configure script. Make sure |
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you have the required libgig version installed. If you're compiling a CVS |
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version of LinuxSampler you usually have to compile and install the current |
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CVS version of libgig as well. Also note there are couple common mistakes which |
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let this error occur even after having compiled and installed the required |
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libgig version. Read |
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<a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=29">this bug report</a> |
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about common mistakes and how you can fix them. |
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</p> |
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|
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<p class="default"> |
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• "<code>can't find a register in class `GENERAL_REGS' while reloading `asm'</code>"<br> |
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<br> |
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This is caused by the inline assembly code for |
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<a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of |
| 341 |
linuxsampler. You have to compile older versions of LinuxSampler (v0.3.3 and older) with |
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-O2 or -O3 to avoid this problem. Usually this is done by default, if not try: |
| 343 |
<br> |
| 344 |
</p> |
| 345 |
<pre class="code">CXXFLAGS="-O3" ./configure |
| 346 |
make</pre> |
| 347 |
<p class="default"> |
| 348 |
Alternatively you could also disable all hand-crafted assembly optimization code by: |
| 349 |
</p> |
| 350 |
<pre class="code">./configure --disable-asm |
| 351 |
make</pre> |
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<p class="default"> |
| 353 |
but the latter is definitely not recommended, as it will increase CPU usage a lot! |
| 354 |
</p> |
| 355 |
|
| 356 |
<p class="default"> |
| 357 |
• "<code>../common/Resampler.h:142: error: memory input 2 is not directly addressable</code>"<br> |
| 358 |
<br> |
| 359 |
This was reported (<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9018347&forum_id=12792">1</a>, |
| 360 |
<a href="http://sourceforge.net/mailarchive/forum.php?thread_id=9019467&forum_id=12792">2</a>) |
| 361 |
to be a gcc/g++ version problem, in conjunction with the inline assembly code for |
| 362 |
<a href="http://en.wikipedia.org/wiki/SIMD">SIMD</a> optimization in older versions of |
| 363 |
linuxsampler. Make sure you got gcc and g++, both of version 3.3 or higher installed. |
| 364 |
You can check this with: |
| 365 |
</p> |
| 366 |
<pre class="code">gcc --version |
| 367 |
g++ --version</pre> |
| 368 |
<p class="default"> |
| 369 |
In case you already got gcc and g++ of version 3.3 or higher |
| 370 |
installed and it still causes the compilation error mentioned |
| 371 |
above, try the following: |
| 372 |
</p> |
| 373 |
<pre class="code">export CC=`which gcc` |
| 374 |
export CXX=`which g++`</pre> |
| 375 |
<p class="default"> |
| 376 |
On certain systems however you still get this error in conjunction with older |
| 377 |
versions of LinuxSampler (v0.3.3 and older). Fortunately newer versions of |
| 378 |
linuxsampler are not affected anymore |
| 379 |
(<a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=34">read this for details</a>). |
| 380 |
</p> |
| 381 |
|
| 382 |
<a name="cvs_checkout"></a> |
| 383 |
<h3>How do I checkout from CVS?</h3> |
| 384 |
<p class="default"> |
| 385 |
The procedure of checking out the newest version from CVS is described on the |
| 386 |
<a href="downloads.html#cvs">Downloads</a> site and on the |
| 387 |
<a href="http://cvs.linuxsampler.org/cgi-bin/viewcvs.cgi/">web interface site |
| 388 |
of our CVS server</a>. |
| 389 |
</p> |
| 390 |
|
| 391 |
<a name="compile_cvs"></a> |
| 392 |
<h3>How do I compile from CVS?</h3> |
| 393 |
<p class="default"> |
| 394 |
The procedure for compiling from CVS is the same for all subprojects, that is no matter |
| 395 |
if you are compiling linuxsampler, qsampler, libgig or liblscp from CVS, you need to |
| 396 |
have the autotools (automake, autoconf and libtool) installed and compile it that way: |
| 397 |
<pre class="code">make -f Makefile.cvs |
| 398 |
./configure |
| 399 |
make</pre> |
| 400 |
</p> |
| 401 |
|
| 402 |
<a name="no_gui"></a> |
| 403 |
<h3>Can I use linuxsampler without a GUI as well?</h3> |
| 404 |
<p class="default"> |
| 405 |
Yes, but unfortunately there is no console based frontend for linuxsampler (yet). |
| 406 |
You have to write LSCP scripts and send it to the running linuxsampler application. But |
| 407 |
don't worry, if you don't know how to write LSCP scripts, you can also start by saving |
| 408 |
a sampler session with QSampler, because the session files qsampler writes are actually |
| 409 |
real LSCP scripts. You can send a LSCP script to linuxsampler on the console with the |
| 410 |
following command: |
| 411 |
</p> |
| 412 |
<pre class="code">netcat localhost 8888 < yourscript.lscp</pre> |
| 413 |
<p class="default"> |
| 414 |
or on certain systems (like Debian) you have to provide the -t switch: |
| 415 |
</p> |
| 416 |
<pre class="code">netcat -t localhost 8888 < yourscript.lscp</pre> |
| 417 |
<p class="default"> |
| 418 |
Of course you can also replace localhost by the IP address of the machine where |
| 419 |
linuxsampler is running. Alternatively you can also make a telnet connection (port 8888) |
| 420 |
to linuxsampler's LSCP server and type commands manually. |
| 421 |
</p> |
| 422 |
|
| 423 |
<a name="examples_lscp"></a> |
| 424 |
<h3>Are there example LSCP script files somewhere?</h3> |
| 425 |
<p class="default"> |
| 426 |
Yes, have a look on the <a href="documentation.html">Documentation</a> site for some |
| 427 |
common LSCP script examples. For details about LSCP read the |
| 428 |
<a href="api/draft-linuxsampler-protocol.html">LSCP reference</a>. Be welcome to ask |
| 429 |
questions for details about LSCP on the |
| 430 |
<a href="http://lists.sourceforge.net/lists/listinfo/linuxsampler-devel">mailing list</a>. |
| 431 |
</p> |
| 432 |
|
| 433 |
<a name="dropouts"></a> |
| 434 |
<h3>I get dropouts (click sounds, noise), what can I do about it?</h3> |
| 435 |
<p class="default"> |
| 436 |
In order to achieve good results under Linux you need to have a |
| 437 |
<a href="http://www.linuxdj.com/audio/lad/resourceslatency.php3">patched kernel</a>. |
| 438 |
There are different patches available depending on what version (2.4.x or 2.6.x) of kernel you use. |
| 439 |
The <a href="http://jackaudio.org/faq">JACK FAQ site</a> |
| 440 |
(or the <a href="http://jackit.sourceforge.net/docs/faq.php">old JACK FAQ site</a>) |
| 441 |
is also a good resource for |
| 442 |
how to configure a realtime stable kernel. But note; LinuxSampler currently has not support for |
| 443 |
libcap yet, that means if you are still using a 2.4.x Linux kernel you most probably have to run |
| 444 |
LinuxSampler with root priviliges. As a rule of thumb: if you don't get warnings like "cannot |
| 445 |
mlockall() memory" on the console, you are safe to run it as ordinary user as well. |
| 446 |
</p> |
| 447 |
|
| 448 |
<a name="runtime_error"></a> |
| 449 |
<h3>LinuxSampler aborts at runtime with ... </h3> |
| 450 |
<p class="default"> |
| 451 |
Note: For <b>Windows specific runtime errors</b>, please have a |
| 452 |
look at the |
| 453 |
<a href="windows.html#houston">Trouble Shooting</a> section of |
| 454 |
the LinuxSampler Windows HOWTO. |
| 455 |
</p> |
| 456 |
|
| 457 |
<p class="default"> |
| 458 |
• "<code>gig::Engine error: Failed to |
| 459 |
load instrument, cause: Unknown exception while trying to |
| 460 |
parse gig file.</code>"<br> |
| 461 |
<br> |
| 462 |
Usually LS gives you a meaningful error message in case it |
| 463 |
failed to load an instrument. However there might be rare |
| 464 |
cases where LS cannot resolve the reason and you get an |
| 465 |
error message like above. In this case make sure security / |
| 466 |
user limits aren't set too low. You can list your current |
| 467 |
limits with: |
| 468 |
</p> |
| 469 |
<pre class="code">ulimit -a</pre> |
| 470 |
<p class="default"> |
| 471 |
Usually most of those settings are set to "unlimited" on |
| 472 |
most boxes. If this is not the case on yours, make sure that |
| 473 |
at least the limits for "max locked memory", "virtual |
| 474 |
memory" and "data seg size" are sufficiently high enough. |
| 475 |
The exact value depends on the instruments you want to load. |
| 476 |
If your security policy allows it, you could simply set |
| 477 |
those limits to "unlimited" (see also config file |
| 478 |
/etc/security/limits.conf and |
| 479 |
<a href="https://bugs.linuxsampler.org/cgi-bin/show_bug.cgi?id=41">bug report #41</a>). |
| 480 |
</p> |
| 481 |
|
| 482 |
</div> |
| 483 |
</td></tr></table> |
| 484 |
|
| 485 |
</div> |
| 486 |
|
| 487 |
</body> |
| 488 |
</html> |
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