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87 lines
3.4 KiB
C
87 lines
3.4 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_VIDEO_H
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#define AVFILTER_VIDEO_H
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#include "avfilter.h"
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AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link,
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int perms, int w, int h);
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AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h);
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/**
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* Request a picture buffer with a specific set of permissions.
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*
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* @param link the output link to the filter from which the buffer will
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* be requested
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* @param perms the required access permissions
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* @param w the minimum width of the buffer to allocate
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* @param h the minimum height of the buffer to allocate
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* @return A reference to the buffer. This must be unreferenced with
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* avfilter_unref_buffer when you are finished with it.
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*/
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AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms,
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int w, int h);
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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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void ff_null_end_frame(AVFilterLink *link);
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/**
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* Notify the next filter of the start of a frame.
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*
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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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*
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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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*/
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int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
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/**
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* Notify the next filter that the current frame has finished.
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*
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* @param link the output link the frame was sent over
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*/
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void ff_end_frame(AVFilterLink *link);
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/**
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* Send a slice to the next filter.
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*
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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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*
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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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*
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* @return >= 0 on success, a negative AVERROR on error.
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*/
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int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
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#endif /* AVFILTER_VIDEO_H */
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