stage of the initialization of the link properties (dimensions, etc)
Index in the age array.
< channel layout of current buffer (see libavutil/channel_layout.h)
Number of channels.
True if the link is closed. If set, all attempts of start_frame, filter_frame or request_frame will fail with AVERROR_EOF, and if necessary the reference will be destroyed. If request_frame returns AVERROR_EOF, this flag is set on the corresponding link. It can be set also be set by either the source or the destination filter.
The buffer reference currently being received across the link by the destination filter. This is used internally by the filter system to allow automatic copying of buffers which do not have sufficient permissions for the destination. This should not be accessed directly by the filters.
Current timestamp of the link, as defined by the most recent frame(s), in AV_TIME_BASE units.
< dest filter
< input pad on the dest filter
Link processing flags.
< agreed upon media format
Number of past frames sent through the link.
Frame rate of the stream on the link, or 1/0 if unknown; if left to 0/0, will be automatically be copied from the first input of the source filter if it exists.
True if a frame is being requested on the link. Used internally by the framework.
Graph the filter belongs to.
< agreed upon image height
Lists of formats and channel layouts supported by the input and output filters respectively. These lists are used for negotiating the format to actually be used, which will be loaded into the format and channel_layout members, above, when chosen.
Lists of channel layouts and sample rates used for automatic negotiation.
Maximum number of samples to filter at once. If filter_frame() is called with more samples, it will split them.
Minimum number of samples to filter at once. If filter_frame() is called with fewer samples, it will accumulate them in partial_buf. This field and the related ones must not be changed after filtering has started. If 0, all related fields are ignored.
Buffer partially filled with samples to achieve a fixed/minimum size.
Size of the partial buffer to allocate. Must be between min_samples and max_samples.
Audio only, the destination filter sets this to a non-zero value to request that buffers with the given number of samples should be sent to it. AVFilterPad.needs_fifo must also be set on the corresponding input pad. Last buffer before EOF will be padded with silence.
< agreed upon sample aspect ratio
< samples per second
< source filter
< output pad on the source filter
Define the time base used by the PTS of the frames/samples which will pass through this link. During the configuration stage, each filter is supposed to change only the output timebase, while the timebase of the input link is assumed to be an unchangeable property.
< filter media type
< agreed upon image width
A link between two filters. This contains pointers to the source and destination filters between which this link exists, and the indexes of the pads involved. In addition, this link also contains the parameters which have been negotiated and agreed upon between the filter, such as image dimensions, format, etc.