FFmpeg
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video.c
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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 
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 }
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
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:35
AVFrame * ff_get_video_buffer(AVFilterLink *link, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:109
uint8_t
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
static AVFrame * get_video_buffer(AVFilterLink *inlink, int w, int h)
Definition: avf_concat.c:205
static AVFrame * frame
int width
width and height of the video frame
Definition: frame.h:220
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:148
simple assert() macros that are a bit more flexible than ISO C assert().
#define FF_TPRINTF_START(ctx, func)
Definition: internal.h:244
#define fail()
Definition: checkasm.h:57
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:232
AVFrame *(* get_video_buffer)(AVFilterLink *link, int w, int h)
Callback function to get a video buffer.
Definition: internal.h:82
void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
Definition: avfilter.c:319
AVFilterBufferRef * avfilter_get_video_buffer_ref_from_arrays(uint8_t *const data[4], const int linesize[4], int perms, int w, int h, enum AVPixelFormat format)
Definition: video.c:64
refcounted data buffer API
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:648
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
Definition: frame.c:265
AVFrame * ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
Definition: video.c:43
#define av_free(p)
int height
Definition: frame.h:220
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240