cadac50da8c277f63b9d73524dc08cd48782fad7
[libav.git] / libavfilter / video.c
1 /*
2 * This file is part of Libav.
3 *
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.
8 *
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.
13 *
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
17 */
18
19 #include <string.h>
20 #include <stdio.h>
21
22 #include "libavutil/buffer.h"
23 #include "libavutil/imgutils.h"
24 #include "libavutil/mem.h"
25
26 #include "avfilter.h"
27 #include "internal.h"
28 #include "video.h"
29
30 AVFrame *ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
31 {
32 return ff_get_video_buffer(link->dst->outputs[0], w, h);
33 }
34
35 /* TODO: set the buffer's priv member to a context structure for the whole
36 * filter chain. This will allow for a buffer pool instead of the constant
37 * alloc & free cycle currently implemented. */
38 AVFrame *ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
39 {
40 AVFrame *frame = av_frame_alloc();
41 int ret;
42
43 if (!frame)
44 return NULL;
45
46 frame->width = w;
47 frame->height = h;
48 frame->format = link->format;
49
50 ret = av_frame_get_buffer(frame, 32);
51 if (ret < 0)
52 av_frame_free(&frame);
53
54 return frame;
55 }
56
57 AVFrame *ff_get_video_buffer(AVFilterLink *link, int w, int h)
58 {
59 AVFrame *ret = NULL;
60
61 FF_DPRINTF_START(NULL, get_video_buffer); ff_dlog_link(NULL, link, 0);
62
63 if (link->dstpad->get_video_buffer)
64 ret = link->dstpad->get_video_buffer(link, w, h);
65
66 if (!ret)
67 ret = ff_default_get_video_buffer(link, w, h);
68
69 return ret;
70 }