[icecast] MP3 decoding, fading and streaming at the same time
wildbill at kpig.com
Thu May 10 08:07:38 PDT 2001
Do a search for 'ecasound'. It does everything you need & more. You'll
probably still want the OSS pro drivers, too.
> > Any idea or suggestion to avoid having two sound cards to do what I need
> > do ?
> > Or how to fade in / fade out without using the card' mixer, while
> > i.e. using mpg123 ?
> Depends on how much you want to program.
> Basically, the easiest would probably be to use OSS software mixing; if
> you buy the commercial OSS drivers, you can have several programs writing
> to /dev/dsp and it will automatically mix.
> Then you need an mp3 playing program capable of software volume level.
> This isn't really what xmms seems to do; xmms seems to control the
> hardware audio level. In any case, you could write this yourself;
> changing the volume is merely a matter of reading in the sample values and
> multiplying them by a factor; 1.0 for no change, < 1.0 for quieter, > 1.0
> for louder (but don't do this because you'll get distortion).
> You could write this as a standard program reading from stdin and writing
> to stdout and thus create a pipeline :
> mpg123 to stdout | volume from stdin to stdout > /dev/dsp
> do this for every file you want to play.
> Anyway, I'm currently writing something like this based on the gstreamer
> platform (gstreamer.net); it should do all of this and a bit more, since
> gstreamer can have various types of input (you could basically mix an mp3
> with an ogg and an MPEG-2-video audio stream) and types of output
> (icecast, disk, sound out, ...).
> <-*- -*->
> There's a world outside
> And I know cause I've heard talk
> In my sweetest dreams
> I would go out for a walk
> <-*- thomas at apestaart.org -*->
> URGent, the best radio on the Internet - 24/7 ! - http://urgent.rug.ac.be/
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