Libav
video.c
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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 
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. */
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 
58 {
59  AVFrame *ret = NULL;
60 
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 }
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
Definition: vf_pad.c:249
This structure describes decoded (raw) audio or video data.
Definition: frame.h:140
misc image utilities
Main libavfilter public API header.
memory handling functions
AVFrame * ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:30
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:57
void ff_dlog_link(void *ctx, AVFilterLink *link, int end)
Definition: avfilter.c:240
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:68
int width
width and height of the video frame
Definition: frame.h:179
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:80
AVFrame *(* get_video_buffer)(AVFilterLink *link, int w, int h)
Callback function to get a video buffer.
Definition: internal.h:54
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:191
NULL
Definition: eval.c:55
refcounted data buffer API
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:274
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
Definition: frame.c:186
AVFrame * ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:38
#define FF_DPRINTF_START(ctx, func)
Definition: internal.h:141
int height
Definition: frame.h:179
internal API functions