2 * This file is part of Libav.
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 #ifndef AVFILTER_VIDEO_H
20 #define AVFILTER_VIDEO_H
24 AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link,
25 int perms, int w, int h);
26 AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h);
28 void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
29 void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
30 void ff_null_end_frame(AVFilterLink *link);
33 * Notify the next filter of the start of a frame.
35 * @param link the output link the frame will be sent over
36 * @param picref A reference to the frame about to be sent. The data for this
37 * frame need only be valid once draw_slice() is called for that
38 * portion. The receiving filter will free this reference when
39 * it no longer needs it.
41 void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
44 * Notify the next filter that the current frame has finished.
46 * @param link the output link the frame was sent over
48 void ff_end_frame(AVFilterLink *link);
51 * Send a slice to the next filter.
53 * Slices have to be provided in sequential order, either in
54 * top-bottom or bottom-top order. If slices are provided in
55 * non-sequential order the behavior of the function is undefined.
57 * @param link the output link over which the frame is being sent
58 * @param y offset in pixels from the top of the image for this slice
59 * @param h height of this slice in pixels
60 * @param slice_dir the assumed direction for sending slices,
61 * from the top slice to the bottom slice if the value is 1,
62 * from the bottom slice to the top slice if the value is -1,
63 * for other values the behavior of the function is undefined.
65 void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
67 #endif /* AVFILTER_VIDEO_H */