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39
AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms,
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int ff_inplace_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
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int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
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int ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
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int ff_null_end_frame(AVFilterLink *link);
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* Notify the next filter of the start of a frame.
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* @param link the output link the frame will be sent over
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* @param picref A reference to the frame about to be sent. The data for this
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* frame need only be valid once draw_slice() is called for that
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* portion. The receiving filter will free this reference when
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* it no longer needs it.
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* @return >= 0 on success, a negative AVERROR on error. This function will
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* unreference picref in case of error.
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int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
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* Notify the next filter that the current frame has finished.
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* @param link the output link the frame was sent over
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* @return >= 0 on success, a negative AVERROR on error
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int ff_end_frame(AVFilterLink *link);
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* Send a slice to the next filter.
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* Slices have to be provided in sequential order, either in
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* top-bottom or bottom-top order. If slices are provided in
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* non-sequential order the behavior of the function is undefined.
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* @param link the output link over which the frame is being sent
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* @param y offset in pixels from the top of the image for this slice
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* @param h height of this slice in pixels
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* @param slice_dir the assumed direction for sending slices,
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* from the top slice to the bottom slice if the value is 1,
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* from the bottom slice to the top slice if the value is -1,
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* for other values the behavior of the function is undefined.
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* @return >= 0 on success, a negative AVERROR on error.
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int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
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42
#endif /* AVFILTER_VIDEO_H */