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Interix audio anyone?
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 Interix audio anyone? - Nov. 27, '05, 9:11:11 AM
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jon493
Posts: 56
Joined: Oct. 14, '05,
Status: offline
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Can Interix support audio? On the face of it, there is no /dev/audio as such. Can anyone please direct me to the proper resource?
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RE: Interix audio anyone? - Nov. 27, '05, 12:15:02 PM
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Rodney
Posts: 3714
Joined: Jul. 9, '02,
From: /Tools lab
Status: offline
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There is no audio access (other than beeps).
The guy from Duh.Org (ToddV) has a library that does audio in a fashion if you have cygwin installed (as I understand).
With version 5.2 (SUA), similar to display driver access, audio can be accessed in mixed mode.
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RE: Interix audio anyone? - Mar. 23, '06, 10:01:19 PM
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breiter
Posts: 346
Joined: Jun. 14, '04,
From: Washington, DC
Status: offline
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My understanding is that the reason there is no audio and for that matter why there is no Interx-based X server is that the Posix subsystem (psxss.exe) runs almost entirely in user mode (except for psxdrv.sys) and, therefore, has no direct access to hardware.
What ToddV did is pretty clever. He compiled esound in Interix with local sound support disabled. That lets you build Interix clients. He then grabbed the esound daemon (esd.exe) from the cygwin ports. You don't need cygwin to run it. Esd.exe just requires libaudiofile.dll and cygwin1.dll, not the whole Cygwin installation. It looks like he also has a script for /etc/init.d to autostart esd.exe.
The end result seems very analagous to the standard situation with X clients displayed on a Win32 X Server. Esd.exe is a Win32 process which is listening on a TCP socket. The Interix audio clients are compiled against libaudio, esound or whatever and talk to esd.exe over TCP.
With Interix 5.2+, I think it might be possible to build esd as a mixed-mode binary so that it calls the same Win32 APIs that the cygwin version uses but is otherwise an Interix binary. I happened to be on the phone with a couple of developers from the Interix team this week and they said that it should/could work but it is not a use case of mixed-mode binaries that they have tested. They did not know for sure if you can successfully use multimedia APIs in mixed-mode binaries.
< Message edited by breiter -- Mar. 23, '06, 10:07:07 PM >
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RE: Interix audio anyone? - Mar. 28, '06, 9:03:54 AM
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jerker_back
Posts: 68
Joined: Jul. 7, '05,
From: Sweden
Status: offline
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quote:
VLC
That is VLC Media Player?
And you wanted to run VLC in a X-server under Interix?
That seems not very efficient to me regarding performance.
However, it would be very interesting to see how to play sounds in posix apps. For SUA mixed-mode apps there should be no problem using the DirectX DSound library. The new DirectX "Cross-Platform Audio Creation Tool" (XACT) and maybe the WinMM PlaySound will perhaps work in posix mode (even if part of the library is WIN32-dependent)? The problem with DirectX is the odd interface to the libraries, so it can not be quickly tested.
quote:
developers from the Interix team ... They did not know for sure if you can successfully use multimedia APIs in mixed-mode binaries.
I will try to test DirectX DSound in a mixed-mode app to see.
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Printable Version
written by UNIXophiles who almost seem to go out of their way to ensure that their software cannot be used on Windows (lack of a free FORTRAN compiler is another reason).