[MPlayer-dev-eng] New audio filter layer

[Gustavo Sverzut Barbieri]

Hi,

I'm sending you an audio filter to the Anders' new layer and a program
to see this data.

My audio filter does not filter anything, just do some analysis and
output it via FIFO.

The other program is a SDL window that captures data from FIFO and
displays it. It's based on plugins, but I've done just a basic "bar
plot" yet, Some cool ones to come.

You'll need the fftw package (http://www.fftw.org) and have to modify
some files:
main/Makefile: add "-lfftw -lrfftw"   to the end of COMMON_LIBS
main/libaf/af.c: replace it with the attached copy (Anders version
doens't support choosing plugins in the CMD line yet, so you must
compile with your option)
main/libaf/Makefile: add af_analysis.c to SRCS


And create this fifo file: ~/.mplayer/af_analysis.fifo. Just mkfifo
~/.mplayer/af_analysis.fifo

Just for your information, after aplying these things and recompiling,
You'll notice that mplayer becomes blocked. It's because no one is
listen to the fifo it's outputing. So you launch the
"audio_visualization" program (also attached) and it'll display an ugly
bar plot


I count on you to improve this program, so give it a try and send me
your feedback!


Gustavo


 --- Anders Johansson <ajh at watri.uwa.edu.au> escreveu: 
> Hi,
> 
> I have finally come to a state in the development of the new audio
> filter layer where I can show my work. The patch is attached to this
> mail. I still have some problems with the buffering. If you want to
> help me have a look at line 179 in dec_audio.c. Sometimes I have to
> throw away data in order to avoid buffer over flow in buf this only
> happens when forward/backward but is still annoying and makes the
> aflayer unsuitable to use with mencoder.
> 
> The new and fun stuff is:
> 
> 1. Resampling from any to any sample rate.
> 2. Auto configuration
> 3. Changing the number of channels to any number of channels.
> 
> Anyway it as you can see the patch is huge. Have a look and give me
> feedback. I hope to apply it to CVS soon.
> 
> Cheers,
> //Anders
> 



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