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
|
/*
* Copyright (c) 2008 Vitor Sessak
*
* 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
* memory buffer source filter
*/
#include "avfilter.h"
#include "vsrc_buffer.h"
#include "libavcore/imgutils.h"
typedef struct {
int64_t pts;
AVFrame frame;
int has_frame;
int h, w;
enum PixelFormat pix_fmt;
AVRational time_base; ///< time_base to set in the output link
AVRational pixel_aspect;
} BufferSourceContext;
int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
int64_t pts, AVRational pixel_aspect)
{
BufferSourceContext *c = buffer_filter->priv;
if (c->has_frame) {
av_log(buffer_filter, AV_LOG_ERROR,
"Buffering several frames is not supported. "
"Please consume all available frames before adding a new one.\n"
);
//return -1;
}
memcpy(c->frame.data , frame->data , sizeof(frame->data));
memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
c->frame.interlaced_frame= frame->interlaced_frame;
c->frame.top_field_first = frame->top_field_first;
c->pts = pts;
c->pixel_aspect = pixel_aspect;
c->has_frame = 1;
return 0;
}
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
BufferSourceContext *c = ctx->priv;
char pix_fmt_str[128];
int n = 0;
if (!args ||
(n = sscanf(args, "%d:%d:%127[^:]:%d:%d", &c->w, &c->h, pix_fmt_str, &c->time_base.num, &c->time_base.den)) != 5) {
av_log(ctx, AV_LOG_ERROR, "Expected 5 arguments, but only %d found in '%s'\n", n, args);
return AVERROR(EINVAL);
}
if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
char *tail;
c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
return AVERROR(EINVAL);
}
}
av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
BufferSourceContext *c = ctx->priv;
enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static int config_props(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
link->w = c->w;
link->h = c->h;
link->time_base = c->time_base;
return 0;
}
static int request_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
AVFilterBufferRef *picref;
if (!c->has_frame) {
av_log(link->src, AV_LOG_ERROR,
"request_frame() called with no available frame!\n");
//return -1;
}
/* This picture will be needed unmodified later for decoding the next
* frame */
picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
AV_PERM_REUSE2,
link->w, link->h);
av_image_copy(picref->data, picref->linesize,
c->frame.data, c->frame.linesize,
picref->format, link->w, link->h);
picref->pts = c->pts;
picref->video->pixel_aspect = c->pixel_aspect;
picref->video->interlaced = c->frame.interlaced_frame;
picref->video->top_field_first = c->frame.top_field_first;
avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
avfilter_draw_slice(link, 0, link->h, 1);
avfilter_end_frame(link);
avfilter_unref_buffer(picref);
c->has_frame = 0;
return 0;
}
static int poll_frame(AVFilterLink *link)
{
BufferSourceContext *c = link->src->priv;
return !!(c->has_frame);
}
AVFilter avfilter_vsrc_buffer = {
.name = "buffer",
.description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
.priv_size = sizeof(BufferSourceContext),
.query_formats = query_formats,
.init = init,
.inputs = (AVFilterPad[]) {{ .name = NULL }},
.outputs = (AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.poll_frame = poll_frame,
.config_props = config_props, },
{ .name = NULL}},
};
|
