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| faq:start [2012/04/04 15:00] – [Q: What is an xrun?] 78.107.251.159 | faq:start [2016/03/20 12:28] – [Q: Is it possible to run VST plugins on Linux?] Replace dead link, mark another link as deprecated content spotlightkid | ||
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| ====== Linux Audio User FAQ (Frequently Asked Questions) ====== | ====== Linux Audio User FAQ (Frequently Asked Questions) ====== | ||
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| ===== General ===== | ===== General ===== | ||
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| [[wiki: | [[wiki: | ||
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| + | In linux kernels 3.0 and later, many of the additionally required realtime patches have been incorporated as standard. For those who are recording Audio, a standard non-realtime kernel may be sufficient for your needs, and running Jack with a non realtime kernel will work fine. | ||
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| + | For those who write a lot of Midi, the standard kernel timing is set at 250Hz, and realtime kernels are generally set at 1000Hz. You may still have to use a realtime kernel to obtain accurate midi playback using the higher timing setting. | ||
| ==== Q: Some of my applications sound a (half)tone too high/low, have a wrong pitch ? ==== | ==== Q: Some of my applications sound a (half)tone too high/low, have a wrong pitch ? ==== | ||
| **A:** It's likely, that the sample-rate of the programs you're using doesn' | **A:** It's likely, that the sample-rate of the programs you're using doesn' | ||
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| * [[http:// | * [[http:// | ||
| * [[http:// | * [[http:// | ||
| + | * [[http:// | ||
| **Applications** | **Applications** | ||
| * [[http:// | * [[http:// | ||
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| ==== Q: What about timers and timing ? ==== | ==== Q: What about timers and timing ? ==== | ||
| - | Modern PCs provide good hardware timing sources. | + | For moderate to new hardware, TSC is the best hardware timing sources. |
| - | One of it is the RTC (real-time-clock). Another one is the HPET (high-precision-event-timer), which is preferable | + | |
| Then there is a software layer (in the kernel) to make available the hw-timers to the applications, | Then there is a software layer (in the kernel) to make available the hw-timers to the applications, | ||
| One example is the usual system-timer. | One example is the usual system-timer. | ||
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| (see: priority settings, rtirq). | (see: priority settings, rtirq). | ||
| - | **How to know, if a HPET (hardware) is available? | + | **How to know, if a TSC / HPET (hardware) is available? |
| + | dmesg | grep -i tsc | ||
| dmesg | grep -i hpet | dmesg | grep -i hpet | ||
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| cat / | cat / | ||
| - | **Related Kernel Options | + | **How to config kernel for HPET?** |
| < | < | ||
| # cat .config | grep -i hpet | # cat .config | grep -i hpet | ||
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| Related Articles: | Related Articles: | ||
| [[http:// | [[http:// | ||
| + | [[http:// | ||
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| **Related sites:** | **Related sites:** | ||
| - | * [[http://quicktoots.linuxaudio.org/toots/vst-plugins/]] - a more detailed introduction | + | * [[http://linux-sound.org/linux-vst-plugins.html]] - VST/VSTi Plugins For Linux |
| - | * [[http://ladspavst.linuxaudio.org/ | + | * [[http://quicktoots.linuxaudio.org/ |
| - | **Note:** Instead of VST, you will soon prefere | + | **Note:** Instead of VST, you may prefer |
| {{tag> | {{tag> | ||