FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
video.c
Go to the documentation of this file.
1 /*
2  * Copyright 2007 Bobby Bingham
3  * Copyright Stefano Sabatini <stefasab gmail com>
4  * Copyright Vitor Sessak <vitor1001 gmail com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <string.h>
24 #include <stdio.h>
25 
26 #include "libavutil/avassert.h"
27 #include "libavutil/buffer.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/mem.h"
30 
31 #include "avfilter.h"
32 #include "internal.h"
33 #include "video.h"
34 
36 {
37  return ff_get_video_buffer(link->dst->outputs[0], w, h);
38 }
39 
40 /* TODO: set the buffer's priv member to a context structure for the whole
41  * filter chain. This will allow for a buffer pool instead of the constant
42  * alloc & free cycle currently implemented. */
44 {
46  int ret;
47 
48  if (!frame)
49  return NULL;
50 
51  frame->width = w;
52  frame->height = h;
53  frame->format = link->format;
54 
55  ret = av_frame_get_buffer(frame, 32);
56  if (ret < 0)
57  av_frame_free(&frame);
58 
59  return frame;
60 }
61 
62 #if FF_API_AVFILTERBUFFER
63 AVFilterBufferRef *
64 avfilter_get_video_buffer_ref_from_arrays(uint8_t * const data[4], const int linesize[4], int perms,
65  int w, int h, enum AVPixelFormat format)
66 {
67  AVFilterBuffer *pic = av_mallocz(sizeof(AVFilterBuffer));
68  AVFilterBufferRef *picref = av_mallocz(sizeof(AVFilterBufferRef));
69 
70  if (!pic || !picref)
71  goto fail;
72 
73  picref->buf = pic;
74  picref->buf->free = ff_avfilter_default_free_buffer;
75  if (!(picref->video = av_mallocz(sizeof(AVFilterBufferRefVideoProps))))
76  goto fail;
77 
78  pic->w = picref->video->w = w;
79  pic->h = picref->video->h = h;
80 
81  /* make sure the buffer gets read permission or it's useless for output */
82  picref->perms = perms | AV_PERM_READ;
83 
84  pic->refcount = 1;
85  picref->type = AVMEDIA_TYPE_VIDEO;
86  pic->format = picref->format = format;
87 
88  memcpy(pic->data, data, 4*sizeof(data[0]));
89  memcpy(pic->linesize, linesize, 4*sizeof(linesize[0]));
90  memcpy(picref->data, pic->data, sizeof(picref->data));
91  memcpy(picref->linesize, pic->linesize, sizeof(picref->linesize));
92 
93  pic-> extended_data = pic->data;
94  picref->extended_data = picref->data;
95 
96  picref->pts = AV_NOPTS_VALUE;
97 
98  return picref;
99 
100 fail:
101  if (picref && picref->video)
102  av_free(picref->video);
103  av_free(picref);
104  av_free(pic);
105  return NULL;
106 }
107 #endif
108 
110 {
111  AVFrame *ret = NULL;
112 
113  FF_TPRINTF_START(NULL, get_video_buffer); ff_tlog_link(NULL, link, 0);
114 
115  if (link->dstpad->get_video_buffer)
116  ret = link->dstpad->get_video_buffer(link, w, h);
117 
118  if (!ret)
119  ret = ff_default_get_video_buffer(link, w, h);
120 
121  return ret;
122 }