[linux-dvb] Re: it won't insmod

[Marcus Metzler <mocm@metzlerbros.de>]

Marcus Metzler writes:
 > Alexandre CONRAD writes:
 >  > >
 >  > >
 >  > >dvb_dsp needs sound support in the kernel enabled. You can disable the
 >  > >use of dvb_dsp by removing the line 
 >  > >export USE_DVB_DSP=1 
 >  > >and the ones following it concernibg dsp in the Makefile.
 >  > >
 >  > But I want sound. How do I enable sound in my kernel ?
 >  > 
 >  > I went in
 >  > /usr/src ; make menuconfig
 >  > in sound, everything seems to be enabled. (it's default Redhat 7.3)
 >  > 
 >  > > > dvb-saa7146.o: unresolved symbol dvb_unregister_dsp
 >  > > > dvb-saa7146.o: unresolved symbol dvb_register_dsp
 >  > >
 >  > >See above. Should be solved with the changes in the Makefile or
 >  > >activation of sound support in the kernel.
 >  > >  
 >  > >
 >  > So what is DSP ? is it come kind of software support ? If I disable it, will it still have the sound ?
 > 
 > You don't need the dsp module for normal DVB operations. It is just
 > there if you want the dvb sound decoder to act as a sound card,
 > i.e. cat into /dev/dsp and here it on the dvb sound output or use an
                               --- shoudl be hear

 > mpeg player to output through the dvb card.
 > 

The module was also meant for cards like the drx3 or maybe upcoming
cards which have even better sound support. The module right now is
just useful for playing pcm sound with 32, 44.1 and 48 kHz.
It does essentially the same what ntuxplayer or vdr do when playing
sound formats, that have to decoded in software, i.e. ac3 or mp3. It
converts an incoming PCM stream in a format that the audio device of
the DVB card understands and pipes it through.

Marcus

-- 
/--------------------------------------------------------------------\
| Dr. Marcus O.C. Metzler        |                                   |
|--------------------------------|-----------------------------------|
| mocm@metzlerbros.de            | http://www.metzlerbros.de/        |
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