Nicolas George (12021-08-19): > This is not that hard to do. As I pointed, I already started working on > it. It would have gone faster if there were other people interesting in, > reviewing the code trustfully and offering useful suggestions.
This is the notes I have taken about format negotiation.
avfilter_graph_config()
graph_config_formats()
query_formats()
filter->query_formats()
ff_merge_*()
reduce_formats()
= if input has only one format, try to keep only it on output
swap_sample_fmts()
= if input has only one format, put the most similar first on outputs
swap_samplerates()
= if input has only one sample rate, put the closest first on outputs
swap_channel_layouts()
pick_formats()
graph_config_links()
graph_check_links()
graph_config_pointers()
The goal now is to describe every step of the negotiation in the
AVFilterNegotiation structure. Right now, the merging step is done. I
will be looking at the reduce and swap code now.
If you want to help, you can start getting familiar with how it works.
--
Nicolas George
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