Greetings.
This is my first post. I looked in the listserv archives but didn't find
anyone talking about this, so here it goes.
I need to implement a new audio (audio only) filter. I see the example code in
filtering_audio.c that uses a buffer sink. But, I'm having a hard time finding
particulars on what everything means. So, I'm hoping someone on this list can
help.
My goal: I have an application that uses the FFMPG library. I need to create a
new custom audio filter, say my_filter.c.
filtering_audio.c looks like the place to start. Is that correct?
In filtering_audio.c:
* Can I get a basic walk-through of the code in the function init_filters? it
looks like there is a source (AVFilter *abuffersrc) and sink buffer (AVFilter
*abuffersing). This looks like two filters. How do I install just one
filter? I'm looking for a basic checklist here so I know that my calls to
avfilter_graph_create_filter, av_filtergraph_parse, etc … are correct …
.basically a walk-through of the example code.
* In avfilter_asink_abuffer (buffersink.c) I see .inputs and .outputs defined.
.inputs defines an AVFilterPad called "default". .outputs defines no (NULL)
filter pads. How does this relate to this code in filtering_audio.c?
/* Endpoints for the filter graph. */
outputs->name = av_strdup("in");
outputs->filter_ctx = buffersrc_ctx;
outputs->pad_idx = 0;
outputs->next = NULL;
inputs->name = av_strdup("out");
inputs->filter_ctx = buffersink_ctx;
inputs->pad_idx = 0;
inputs->next = NULL;
Thank you in advance.
Cheers,
Richard Schilling_______________________________________________
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