RE: lug-bg: Alsa Sound
- Subject: RE: lug-bg: Alsa Sound
- From: ivo@xxxxxxxxxxxxxx (Ivaylo Toshev)
- Date: 19 Feb 2003 12:09:51 +0200
A êàæè ìè òîãàâà êîå å òîâà ïðèëîæåíèå ïîä LINUX êîåòî ïîëçâà G.729a ?
A è â ìîìåíòà ñ Êëèìåíò ñè ïèøåì è òîé òúðñè òî÷íî òîçè êîäåê G.729a ïîä
äúðâî è êàìúê - àìà òö ! Íÿìà ! È â ñêëàäà íÿìà è îò Ñüþçà íå ïðàùàò...
;-)
Íà ñð, 2003-02-19 â 12:00, Boyan Krosnov çàïèñà:
> Sys G.729a bez header compression i bez VAD prez 64kbps full-duplex liniq spokojno minavat 2 call-a
> ( ako predpolojim che polzvash 20ms (2x10ms) samples vyv vseki paket - 20 bytes
> ip - 20; udp - 8; rtp - 12;
> primerno vyrhu frame-relay - 8 bytes (kato broish i dvata flaga, a trqbwa da se broi samo ediniq
> ------------- <-- bakalskata cherta
> 68 bytes / 20 ms, koeto shte reche 3400 bytes/s -> 27200 bps
> )
>
> Sys G.729a i rtp header compression i bez VAD
> vmesto da se predavat 40 bytes headeri se predavat na praktika 2 do 5 bytes
> (otnovo bakalskata smetka...)
> best case:
> 20+2+8= 30 bytes/20ms -> 1500 bytes/s -> 12000 bps
> worst case:
> 20+5+8= 33 bytes/20ms -> 1650 bytes/s -> 13200 bps
> S drugi dumi 4 do 5 call-a s codec G.729a vyrhi sinhronna serijna liniq na 64kbps sys frame-relay i CRTP. Tova bez da se broi VAD-a.
>
> sources:
> http://www.erlang.com/bandwidth.html
> http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/frame.htm
> http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800b75cc.html#22195
> (i za tezi koito ne gi e strah ot RFC-ta) http://www.ietf.org/rfc/rfc2508.txt
>
> Ta tvyrdenieto che lipsata na svoboden G.723.1 codec ti prechi da vodish 1 normalen razgovor na 64kbps liniq e meko kazano presileno. :)
>
> BR,
> Boyan Krosnov, CCIE#8701
> http://boyan.ludost.net/
> just another techie speaking for himself
>
> -----Original Message-----
> From: Ivaylo Toshev [mailto:ivo@xxxxxxxxxxxxxx]
> Sent: Wednesday, February 19, 2003 10:52 AM
> To: lug-bg@xxxxxxxxxxxxxxxxxx
> Subject: lug-bg: Alsa Sound
>
>
> À, çäðàâåéòå,
> Çíà÷è áà÷êàì ñè àç íà RH 8.0 è ìè ñå íàëîæè äà ïîëçâàì Gnomemeeting è âñè÷êè äðóãè âúçìîæíè H.323 êëèåíòè çà VoIP. Âñè÷êî õóáàâî, áà÷êàò, êàòî ñå èçêëþ÷è ðàçáèðà ñå ëèïñàòà íà ñâîáîäåí êîäåê G.723.1, êîåòî ïðå÷è ïîä LINUX äà ñå âîäè íîðìàëåí ðàçãîâîð ïðè ëèíèÿ 64kbps.
> Ïðîáëåìà, îáà÷å ìè áåøå ñ full-duplex ðåæèìà íà sound êàðòàòà. Çà òåçè êîèòî ñå áîðÿò ñ ïîäîáåí ïðîáëåì, ùå êàæà, ÷å çà êàðòà: Cirrus Logic CS 4614/22/24 â RH 8.0 ñå ïîëçâàò ñòàíäàðòíèòå äðàéâåðè íà ÿäðîòî (êàêòî è çà âñè÷êè äðóãè çâóêîâè êàðòè ïîä RH8.0). Ñ äâå äóìè ïðîáëåìà ñå ðåøè êàòî ñè êîìïèëèðàõ ALSA (ñàìî, ÷å òðÿáâà äà å ïîñëåäíàòà áåòà âåðñèÿ!) è äóïëåêñà ñè òðúãíà êàòî ñëúíöå.
> ÎÁÀ×Å: Ñòàíäàðòíàòà èíñòàëàöèÿ íà ALSA îò ñîðñ èìà ñâîéñòâîòî äà ïóñêà âñè÷êè êàíàëè â MUTE ðåæèì ïðè çàðåæäàíå íà äðàéâåðèòå. Çà äà ãè "îòïóñíà" ïîëçâàì alsamixer è âñè÷êî å OK.
> Å ! Èìà ëè íà÷èí äà çàïèøà ñòîéíîñòèòå íà ìèêñåðà íÿêúäå, çà äà íå ãî ïðàâÿ ïðè âñåêè boot íà ìàïèíàòà ?
>
>
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