[FFmpeg-soc] [soc] Next steps for lavfi audio

[Aurelien Jacobs]

On Fri, Jul 16, 2010 at 01:44:27AM -0700, S.N. Hemanth Meenakshisundaram wrote:
> 
> Hi All,
> 
> With the framework up and af_resample working on the framework, what
> other kinds of audio filters can I work on?
> 
> Stefano had earlier suggested exploring 1. Audio Visualization
> filters and 2. Digital filters applied to audio.
> 
> I have a couple of questions about this:
> 
> [...]
> 
> 2. For audio visualization systems, how can I access the video
> thread to display the visualizations.

Ouch ! You don't want to access the video thread !
What you want is to create a simple filter which take one audio input
stream and generate one video output stream.
For now it would be nice to implement (copy?) the same visualization
effects that the ones ffplay supports.
Then the visualization effects code could be remove from ffplay, and it
could be replace by building a filter graph which would split audio in
two identical streams. One stream would be feeded to a visualization
filter and the other one would just passthru to the end of the filter
graph.

Aurel