[linux-audio-dev] pros/cons of poll vs. asynch notify in ALSA
Anybody have any opinions on whether it is better to use polling or asynchronous notification when using the ALSA lib? i'm fishing for advantages re: speed, robustness, portability, etc -jacob robbins.
[linux-audio-dev] RTP MIDI update ...
Hi everyone, Just sent in an updated version of the RTP MIDI normative I-D off to [EMAIL PROTECTED] You can download a copy now from: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-rtp-midi.txt In a hopeful sign, the Change Log is sufficiently short to reproduce in full below: Chapter M (Appendix A.9) has been redesigned, to follow the semantic design of Chapters C and E. Several definitions in Appendix A.1 have been changed to reflect this change, as have the chapter inclusion semantics for Chapter M in Appendix C.1.3. Many small editorial changes throughout the document, to correct grammatical errors and improve phrasing. I'm actually starting to re-code sfront networking to be compliant with the I-D (it has fallen out of date since the AVT RTP MIDI effort began), in the hopes of gcc catching bugs that peer-review may miss. Once that coding is complete, "Last Call" is probably not too far away ... so if you've been planning to spend a few hours to reading over the I-D and sending along comments, now would be a good time to do it. You might also want to download the non-normative Implementation Guide for RTP MIDI: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-guide.txt - John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -
Re: [linux-audio-dev] Re: |||| Gain/Peak indicator
On Tue, Jun 24, 2003 at 11:19:52AM -0400, Marc Lavallée wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA1 > > Le 24 Juin 2003 10:35, Andrew Burgess a écrit : > > >Also for sound limiter (compressor) algorithms . > > > > Sox has a compander and there is also a Dyson compressor LADSPA plugin. > > > > http://sox.sourceforge.net/ > > http://plugin.org.uk/faq.php > > The Dyson compressor is also included in ecasound: > http://www.wakkanet.fi/~kaiv/ecasound/ Yup the LADSPA code comes form the ecasound version of the origninal Dyson. I dont recommend if for study though, its unusually cryptic. There are some native LADSPA compressors (SCn) that are easier to follow. - Steve
Re: [linux-audio-dev] |||| Gain/Peak indicator
Peak amplitude is just that - the largest abs sample value since you last read it. RMS is calculated by summing sqaured samples over some period of time then taking the sqrt of the mean. Limiters and compressors are much trickier. On Mon, Jun 23, 2003 at 05:50:08 +0300, Ralfs Kurmis wrote: > Hi to developers > > I'm search for realtime sound and peak gain indicator (db) algorithms and > formulas. > My first idea is all 16 bit absolute sound_sample_values in time interval > t1...t2 compare with ethalon sine wave > ( where ethalon sine wave amplitude is 32000 and lenght/2 is t2-t1 ) > > Also for sound limiter (compressor) algorithms .
