Link configuration callback.
@deprecated unused
@deprecated unused
Filtering callback. This is where a filter receives a frame with audio/video data and should do its processing.
Callback function to get an audio buffer. If NULL, the filter system will use ff_default_get_audio_buffer().
Callback function to get a video buffer. If NULL, the filter system will use ff_default_get_video_buffer().
Input pads: Minimum required permissions on incoming buffers. Any buffer with insufficient permissions will be automatically copied by the filter system to a new buffer which provides the needed access permissions.
Pad name. The name is unique among inputs and among outputs, but an input may have the same name as an output. This may be NULL if this pad has no need to ever be referenced by name.
The filter expects a fifo to be inserted on its input link, typically because it has a delay.
The filter expects writable frames from its input link, duplicating data buffers if needed.
Frame poll callback. This returns the number of immediately available samples. It should return a positive value if the next request_frame() is guaranteed to return one frame (with no delay).
Input pads: Permissions which are not accepted on incoming buffers. Any buffer which has any of these permissions set will be automatically copied by the filter system to a new buffer which does not have those permissions. This can be used to easily disallow buffers with AV_PERM_REUSE.
Frame request callback. A call to this should result in at least one frame being output over the given link. This should return zero on success, and another value on error. See ff_request_frame() for the error codes with a specific meaning.
@deprecated unused
AVFilterPad type.
A filter pad used for either input or output.
See doc/filter_design.txt for details on how to implement the methods.
@warning this struct might be removed from public API. users should call avfilter_pad_get_name() and avfilter_pad_get_type() to access the name and type fields; there should be no need to access any other fields from outside of libavfilter.