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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
/*
* 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
*/
/**
* @file
* FIFO buffering filter
*/
#include "libavutil/common.h"
#include "libavutil/mathematics.h"
#include "audio.h"
#include "avfilter.h"
#include "internal.h"
typedef struct Buf {
AVFrame *frame;
struct Buf *next;
} Buf;
typedef struct FifoContext {
Buf root;
Buf *last; ///< last buffered frame
/**
* When a specific number of output samples is requested, the partial
* buffer is stored here
*/
AVFrame *out;
int allocated_samples; ///< number of samples out was allocated for
} FifoContext;
static av_cold int init(AVFilterContext *ctx)
{
FifoContext *s = ctx->priv;
s->last = &s->root;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
FifoContext *s = ctx->priv;
Buf *buf, *tmp;
for (buf = s->root.next; buf; buf = tmp) {
tmp = buf->next;
av_frame_free(&buf->frame);
av_free(buf);
}
av_frame_free(&s->out);
}
static int add_to_queue(AVFilterLink *inlink, AVFrame *frame)
{
FifoContext *s = inlink->dst->priv;
s->last->next = av_mallocz(sizeof(Buf));
if (!s->last->next) {
av_frame_free(&frame);
return AVERROR(ENOMEM);
}
s->last = s->last->next;
s->last->frame = frame;
return 0;
}
static void queue_pop(FifoContext *s)
{
Buf *tmp = s->root.next->next;
if (s->last == s->root.next)
s->last = &s->root;
av_freep(&s->root.next);
s->root.next = tmp;
}
static int request_frame(AVFilterLink *outlink)
{
FifoContext *s = outlink->src->priv;
int ret = 0;
if (!s->root.next) {
if ((ret = ff_request_frame(outlink->src->inputs[0])) < 0)
return ret;
if (!s->root.next)
return 0;
}
ret = ff_filter_frame(outlink, s->root.next->frame);
queue_pop(s);
return ret;
}
static const AVFilterPad avfilter_vf_fifo_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = add_to_queue,
},
};
static const AVFilterPad avfilter_vf_fifo_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
},
};
const AVFilter ff_vf_fifo = {
.name = "fifo",
.description = NULL_IF_CONFIG_SMALL("Buffer input images and send them when they are requested."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(FifoContext),
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(avfilter_vf_fifo_inputs),
FILTER_OUTPUTS(avfilter_vf_fifo_outputs),
};
static const AVFilterPad avfilter_af_afifo_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = add_to_queue,
},
};
static const AVFilterPad avfilter_af_afifo_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.request_frame = request_frame,
},
};
const AVFilter ff_af_afifo = {
.name = "afifo",
.description = NULL_IF_CONFIG_SMALL("Buffer input frames and send them when they are requested."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(FifoContext),
.flags = AVFILTER_FLAG_METADATA_ONLY,
FILTER_INPUTS(avfilter_af_afifo_inputs),
FILTER_OUTPUTS(avfilter_af_afifo_outputs),
};
|
