[gst-devel] newbie questions

Akos Maroy darkeye at tyrell.hu
Tue May 24 02:55:34 CEST 2005


I'm new to gstreamer, and I have a few questions, which I'm sure you'll
find very basic, but I couldn't myself find the answer for.

- difference / converting between audio/x-raw-int and audio/x-raw-float

I see that some audio related plugins use x-raw-int, some use
x-raw-float as the raw audio format. is there a plugin that would
convert between these two formats?

for example, vorbisdec has a 'src' pad in x-raw-float format, but for
osssink (or volenv) only support x-raw-int

- how to write a play offset plugin?

I'd need the following functionality: for an input, I'd either need to
play only a portion, or I'd need to add extra silence before or after
the input.

for example, say I have a 60 second audio input, I need to play it as

    - only play from the 5th second up to the 45th second,
      making it a 40 second input

         +--------- 60 second input -----------------+
            +---- 5th to 45th second ---------+

    - start playing only 11seconds later, and after the 60secs, have
      a 5second silence afterwards, making it a 76second input

           +--------- 60 second input -----------------+
  +-11sec-++--------- 60 second input -----------------++-5sec-+

I wonder how this could be achieved with a plugin (or if there's already
a plugin that achieves this functionality). why I'm wondering is that
the chains channel data through the whole chain, but here a plugin
making the above functionality available whould need to act to some
extent without receiving input on its sink.


More information about the gstreamer-devel mailing list