RE: [linux-audio-dev] suggestion for developers: real quad-channel output on an SBlive
There is a way of pointing to all 4 channels in Windows by installing EMU APS drivers for sblive (and thus trashing the eax support, but at least you'll get sub 20ms latency in windows with a creative card, which is probably as good as it gets), and using the ASIO driver that comes with that one + Cubase or something similar that can use ASIO in an efficient manner. For more info on the driver go to: http://come.to/sblive As far as the linux is concerned, I've heard that /dev/dsp0 points to front stereo, while dev/dsp1 to the rear stereo, but never got to test this one out, and am not sure whether the issue pertains to alsa or oss drivers (or both), neither do I know how good it is (last time I checked the back stereo was mirrored front, nothing more). I'd suggest visiting emu10k1 linux mailing list (forgot the URL, but remember it being named emu10k1-devel, and I am sure you'll easily find it by doing a web search on it). The third way of addressing 5.1 surround in windows is to get something like softencode (and dish out major $) which can supposedly do that kind of encoding, or the pan-something plugin for cooledit pro, since, as far as I understand the issue, the surround stuff can be easily embedded into the regular stereo wav file, so it in reality is not so easily separable (other than using EMU APS drivers). Hope this helps! Ivica Bukvic -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of STEFFL, ERIK *Internet* (SBCSI) Sent: Wednesday, November 21, 2001 4:04 PM To: '[EMAIL PROTECTED]' Subject: RE: [linux-audio-dev] suggestion for developers: real quad-channel output on an SBlive -Original Message- From: D. Stimits [mailto:[EMAIL PROTECTED]] Sent: Wednesday, November 21, 2001 11:17 AM To: [EMAIL PROTECTED] Subject: Re: [linux-audio-dev] suggestion for developers: real quad-channel output on an SBlive STEFFL, ERIK *Internet* (SBCSI) wrote: -Original Message- From: Josh Whiting [mailto:[EMAIL PROTECTED]] i am a list-lurker, primarily a windows multimedia user, but with an interest in audio software development and hence an interest in linux. anyway, i have and idea that has been provoked by my recent explorations into quad-channel audio output. Basically, the idea is to write a driver to interface with the SB-Live EAX bus that converts the SB live into a more-or-less 'true' four channel output device. How? 1 - setup two stereo virtual audio input ports, 2 - assign each channel a status in the EAX bus as a sound source with a specific spatial position so as to emulate the direct dispatch of each channel to its respective output in the dual-output SB live DACs. You may not even need two virtual ports, as you could probably assign the main output (sb live wave out) to the front stereo outputs and then just send the second (virtual) stereo stream to the rear outputs. and bam - the SB live is now a (low cost) four channel output device, overcoming the (idiotic, painful) limitations imposed by creative's engineering of the board only support a single stereo output even though the card has two of them... ? sb live provides 5.1 output under windows (you can set output under speakers in eax control center (headphones, two speakers, 4 speakers, 5.1 speakers), there's also a demo for that somewhere there). Not sure how it works under linux (I don't have linux installed on that computer yet). EAX is proprietary. It isn't available under Linux, and unlikely it ever will. The OpenAL code is probably the closest you'll see in the near future, but something of a similar idea could probably be used there (just not EAX). aha. but if eax can do it then there has to be hw that supports it, right? otherwise eax would be able to output 5 separate channels (and it does, even though I don't know how well separated they are). the original post was talking about more-or-less true 4 channel and I was saying that 5 channel output is possible (using sb live HW, there might be software issues involved that are not easy to solve). or are you saying that using information available to opensource developers it is not possible to use the same HW that eax uses? erik
RE: [linux-audio-dev] suggestion for developers: real quad-channel output on an SBlive
-Original Message- From: Josh Whiting [mailto:[EMAIL PROTECTED]] i am a list-lurker, primarily a windows multimedia user, but with an interest in audio software development and hence an interest in linux. anyway, i have and idea that has been provoked by my recent explorations into quad-channel audio output. Basically, the idea is to write a driver to interface with the SB-Live EAX bus that converts the SB live into a more-or-less 'true' four channel output device. How? 1 - setup two stereo virtual audio input ports, 2 - assign each channel a status in the EAX bus as a sound source with a specific spatial position so as to emulate the direct dispatch of each channel to its respective output in the dual-output SB live DACs. You may not even need two virtual ports, as you could probably assign the main output (sb live wave out) to the front stereo outputs and then just send the second (virtual) stereo stream to the rear outputs. and bam - the SB live is now a (low cost) four channel output device, overcoming the (idiotic, painful) limitations imposed by creative's engineering of the board only support a single stereo output even though the card has two of them... ? sb live provides 5.1 output under windows (you can set output under speakers in eax control center (headphones, two speakers, 4 speakers, 5.1 speakers), there's also a demo for that somewhere there). Not sure how it works under linux (I don't have linux installed on that computer yet). erik
Re: [linux-audio-dev] suggestion for developers: real quad-channel output on an SBlive
STEFFL, ERIK *Internet* (SBCSI) wrote: -Original Message- From: Josh Whiting [mailto:[EMAIL PROTECTED]] i am a list-lurker, primarily a windows multimedia user, but with an interest in audio software development and hence an interest in linux. anyway, i have and idea that has been provoked by my recent explorations into quad-channel audio output. Basically, the idea is to write a driver to interface with the SB-Live EAX bus that converts the SB live into a more-or-less 'true' four channel output device. How? 1 - setup two stereo virtual audio input ports, 2 - assign each channel a status in the EAX bus as a sound source with a specific spatial position so as to emulate the direct dispatch of each channel to its respective output in the dual-output SB live DACs. You may not even need two virtual ports, as you could probably assign the main output (sb live wave out) to the front stereo outputs and then just send the second (virtual) stereo stream to the rear outputs. and bam - the SB live is now a (low cost) four channel output device, overcoming the (idiotic, painful) limitations imposed by creative's engineering of the board only support a single stereo output even though the card has two of them... ? sb live provides 5.1 output under windows (you can set output under speakers in eax control center (headphones, two speakers, 4 speakers, 5.1 speakers), there's also a demo for that somewhere there). Not sure how it works under linux (I don't have linux installed on that computer yet). EAX is proprietary. It isn't available under Linux, and unlikely it ever will. The OpenAL code is probably the closest you'll see in the near future, but something of a similar idea could probably be used there (just not EAX). D. Stimits, [EMAIL PROTECTED] erik
RE: [linux-audio-dev] suggestion for developers: real quad-channel output on an SBlive
-Original Message- From: D. Stimits [mailto:[EMAIL PROTECTED]] Sent: Wednesday, November 21, 2001 11:17 AM To: [EMAIL PROTECTED] Subject: Re: [linux-audio-dev] suggestion for developers: real quad-channel output on an SBlive STEFFL, ERIK *Internet* (SBCSI) wrote: -Original Message- From: Josh Whiting [mailto:[EMAIL PROTECTED]] i am a list-lurker, primarily a windows multimedia user, but with an interest in audio software development and hence an interest in linux. anyway, i have and idea that has been provoked by my recent explorations into quad-channel audio output. Basically, the idea is to write a driver to interface with the SB-Live EAX bus that converts the SB live into a more-or-less 'true' four channel output device. How? 1 - setup two stereo virtual audio input ports, 2 - assign each channel a status in the EAX bus as a sound source with a specific spatial position so as to emulate the direct dispatch of each channel to its respective output in the dual-output SB live DACs. You may not even need two virtual ports, as you could probably assign the main output (sb live wave out) to the front stereo outputs and then just send the second (virtual) stereo stream to the rear outputs. and bam - the SB live is now a (low cost) four channel output device, overcoming the (idiotic, painful) limitations imposed by creative's engineering of the board only support a single stereo output even though the card has two of them... ? sb live provides 5.1 output under windows (you can set output under speakers in eax control center (headphones, two speakers, 4 speakers, 5.1 speakers), there's also a demo for that somewhere there). Not sure how it works under linux (I don't have linux installed on that computer yet). EAX is proprietary. It isn't available under Linux, and unlikely it ever will. The OpenAL code is probably the closest you'll see in the near future, but something of a similar idea could probably be used there (just not EAX). aha. but if eax can do it then there has to be hw that supports it, right? otherwise eax would be able to output 5 separate channels (and it does, even though I don't know how well separated they are). the original post was talking about more-or-less true 4 channel and I was saying that 5 channel output is possible (using sb live HW, there might be software issues involved that are not easy to solve). or are you saying that using information available to opensource developers it is not possible to use the same HW that eax uses? erik
