I am in the throes of setting up a bit of DSP with ladspa within ALSA on PCP. What I need is something like a "night mode" compressor.
Achieving this with ALSA is not user-friendly and I hit limitations. Due to the ladpsa chain -and a dmixer I need for other reasons- I end up with PCP players that have lost their equalizer GUI and need a buffer size of at least 325ms to play CD-quality sources. The compressor chain is rather crude (I don't know how to use a side-chain in ALSA) and that big buffer is not good news for sync: players can be in sync but the audio processing in ALSA somehow not, so it is now possible to get discernable echo and the players will not try to fix it, they sustain it... So to make sure as little as possible happens in the ALSA layer, I've fixed players to report and use 16/44.1. And now sox kicks in when the occasional DVD-A comes about and this taxes the server, too. All of this with raspberry amplifier boards that can support natively a ludicrous number of samples sizes and frequencies but are a bit lacking in the mixer department.... Then it hit me: I don't really mind loading the server up to the gills or adding latency as long as further down the road the software players sync and use an ALSA layer as thin as possible. It looks like sox is ladspa- or maybe lv2-aware, so I am wondering if a DSP plugin in LMS would make sense? 3 SB 3 Libratone Loop, Zipp Mini iPeng (iPhone + iPad) LMS 7.9 (linux) with plugins: CD Player, WaveInput, Triode's BBC iPlayer by bpa IRBlaster by Gwendesign (Felix) Server Power Control by Gordon Harris Smart Mix, Music Walk With Me, What Was That Tune? by Michael Herger PowerSave by Jason Holtzapple Song Info, Song Lyrics by Erland Isaksson AirPlay Bridge by philippe_44 WeatherTime by Martin Rehfeld Auto Dim Display, SaverSwitcher, ContextMenu by Peter Watkins. ------------------------------------------------------------------------ epoch1970's Profile: http://forums.slimdevices.com/member.php?userid=16711 View this thread: http://forums.slimdevices.com/showthread.php?t=107679
_______________________________________________ Squeezecenter mailing list Squeezecenter@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/squeezecenter
