2 * Copyright (c) 2007 Bobby Bingham
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #ifndef AVFILTER_VIDEO_H
23 #define AVFILTER_VIDEO_H
27 AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link,
28 int perms, int w, int h);
29 AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h);
32 * Request a picture buffer with a specific set of permissions.
34 * @param link the output link to the filter from which the buffer will
36 * @param perms the required access permissions
37 * @param w the minimum width of the buffer to allocate
38 * @param h the minimum height of the buffer to allocate
39 * @return A reference to the buffer. This must be unreferenced with
40 * avfilter_unref_buffer when you are finished with it.
42 AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms,
45 void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
46 void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
47 void ff_null_end_frame(AVFilterLink *link);
50 * Notify the next filter of the start of a frame.
52 * @param link the output link the frame will be sent over
53 * @param picref A reference to the frame about to be sent. The data for this
54 * frame need only be valid once draw_slice() is called for that
55 * portion. The receiving filter will free this reference when
56 * it no longer needs it.
58 void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);
61 * Pass video frame along and keep an internal reference for later use.
63 void ff_null_start_frame_keep_ref(AVFilterLink *inlink, AVFilterBufferRef *picref);
66 * Notify the next filter that the current frame has finished.
68 * @param link the output link the frame was sent over
70 void ff_end_frame(AVFilterLink *link);
73 * Send a slice to the next filter.
75 * Slices have to be provided in sequential order, either in
76 * top-bottom or bottom-top order. If slices are provided in
77 * non-sequential order the behavior of the function is undefined.
79 * @param link the output link over which the frame is being sent
80 * @param y offset in pixels from the top of the image for this slice
81 * @param h height of this slice in pixels
82 * @param slice_dir the assumed direction for sending slices,
83 * from the top slice to the bottom slice if the value is 1,
84 * from the bottom slice to the top slice if the value is -1,
85 * for other values the behavior of the function is undefined.
87 void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
89 #endif /* AVFILTER_VIDEO_H */