[gst-devel] libmpg123 decoder plugin
Roland Poppenreiter
r_poppi at gmx.at
Wed Jan 14 16:41:16 CET 2009
Hello everybody,
I hope this is the right mailinglist for this anouncement. I wrote
a mp3 decoder plugin with the mpg123 library. One reason is that
mpg123 has some processor optimization (SSE, MMX, 3DNow, ...) in it
and should be faster than the mad decoder. I used the mad decoder
plugin (gstmad.c) as template for my plugin - so they are quite
similar. I wanted to benchmark both decoders and compare the results
but I ran into several problems and I got a few questions:
- sometimes i get a short white noise sound when i start playing an
mp3 file with my mpg123 decoder plugin.
- short white noise sound appears after seeking as well.
- is it possible that data comming from the filesrc is sometimes
overlapping?
- seeking is not always working, also not with the mad decoder.
- the mad decoder decodes mpg samples to audio/x-raw-int 32 Bit,
but most extensions (SSE, MMX, ...) can just handle 16 Bit
samples, therefore I would preferre 16 Bit audio/x-raw-int as
output for my decoder.
I wrote a small mediaplayer (described in the GStreamer Application
Development Manual) to test my plugin. The problems occur with my
mediaplayer and also with the gst-launch program.
Sourcecode can be found here: https://semsemilla.kastel.net/gst/
I would appreciate little help to solve my problems or any opinion
about this plugin.
-- Roland Poppenreiter
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