1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* Filter layer - default implementations
* copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avfilter.h"
/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
void avfilter_default_free_video_buffer(AVFilterPic *pic)
{
avpicture_free((AVPicture *) pic);
av_free(pic);
}
AVFilterPicRef *avfilter_next_get_video_buffer(AVFilterLink *link, int perms)
{
if(!link->dst->outputs[0])
return NULL;
return avfilter_get_video_buffer(link->dst->outputs[0], perms);
}
/* TODO: set the buffer's priv member to a context structure for the whole
* filter chain. This will allow for a buffer pool instead of the constant
* alloc & free cycle currently implemented. */
AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
{
AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
ref->pic = pic;
ref->w = link->w;
ref->h = link->h;
ref->perms = perms;
/* we always give the destination filter read access by default */
avfilter_add_pic_perms(ref, link->dst, AV_PERM_READ);
pic->refcount = 1;
pic->format = link->format;
pic->free = avfilter_default_free_video_buffer;
avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
memcpy(ref->data, pic->data, sizeof(pic->data));
memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
return ref;
}
void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
AVFilterLink *out = NULL;
if(link->dst->output_count)
out = link->dst->outputs[0];
if(out) {
out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE);
out->outpic->pts = picref->pts;
avfilter_start_frame(out, avfilter_ref_pic(out->outpic, out->dst, ~0));
}
}
void avfilter_default_end_frame(AVFilterLink *link)
{
AVFilterLink *out = NULL;
if(link->dst->output_count)
out = link->dst->outputs[0];
avfilter_unref_pic(link->cur_pic);
link->cur_pic = NULL;
if(out) {
if(out->outpic) {
avfilter_unref_pic(out->outpic);
out->outpic = NULL;
}
avfilter_end_frame(out);
}
}
/**
* default config_link() implementation for output video links to simplify
* the implementation of one input one output video filters */
int avfilter_default_config_output_link(AVFilterLink *link)
{
if(link->src->input_count && link->src->inputs[0]) {
link->w = link->src->inputs[0]->w;
link->h = link->src->inputs[0]->h;
} else {
/* XXX: any non-simple filter which would cause this branch to be taken
* really should implement its own config_props() for this link. */
link->w =
link->h = 0;
}
return 0;
}
/**
* default config_link() implementation for input video links to simplify
* the implementation of one input one output video filters */
int avfilter_default_config_input_link(AVFilterLink *link)
{
if(!link->dst->output_count)
return 0;
return avfilter_config_link(link->dst->outputs[0]);
}
/**
* default query_formats() implementation for output video links to simplify
* the implementation of one input one output video filters */
int *avfilter_default_query_output_formats(AVFilterLink *link)
{
if(link->src->input_count && link->src->inputs[0])
return avfilter_make_format_list(1, link->src->inputs[0]->format);
else
/* XXX: any non-simple filter which would cause this branch to be taken
* really should implement its own query_formats() for this link */
return avfilter_make_format_list(0);
}
|
