Add pad filter.
[libav.git] / libavfilter / vsrc_buffer.c
1 /*
2 * Memory buffer source filter
3 * Copyright (c) 2008 Vitor Sessak
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avfilter.h"
23 #include "vsrc_buffer.h"
24
25 typedef struct {
26 int64_t pts;
27 AVFrame frame;
28 int has_frame;
29 int h, w, pix_fmt;
30 AVRational pixel_aspect;
31 } BufferSourceContext;
32
33
34 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
35 int64_t pts, AVRational pixel_aspect)
36 {
37 BufferSourceContext *c = buffer_filter->priv;
38
39 if (c->has_frame) {
40 av_log(buffer_filter, AV_LOG_ERROR,
41 "Buffering several frames is not supported. "
42 "Please consume all available frames before adding a new one.\n"
43 );
44 //return -1;
45 }
46
47 memcpy(c->frame.data , frame->data , sizeof(frame->data));
48 memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
49 c->frame.interlaced_frame= frame->interlaced_frame;
50 c->frame.top_field_first = frame->top_field_first;
51 c->pts = pts;
52 c->pixel_aspect = pixel_aspect;
53 c->has_frame = 1;
54
55 return 0;
56 }
57
58 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
59 {
60 BufferSourceContext *c = ctx->priv;
61
62 if(args && sscanf(args, "%d:%d:%d", &c->w, &c->h, &c->pix_fmt) == 3)
63 return 0;
64
65 av_log(ctx, AV_LOG_ERROR, "init() expected 3 arguments:'%s'\n", args);
66 return -1;
67 }
68
69 static int query_formats(AVFilterContext *ctx)
70 {
71 BufferSourceContext *c = ctx->priv;
72 enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
73
74 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
75 return 0;
76 }
77
78 static int config_props(AVFilterLink *link)
79 {
80 BufferSourceContext *c = link->src->priv;
81
82 link->w = c->w;
83 link->h = c->h;
84
85 return 0;
86 }
87
88
89 static int request_frame(AVFilterLink *link)
90 {
91 BufferSourceContext *c = link->src->priv;
92 AVFilterPicRef *picref;
93
94 if (!c->has_frame) {
95 av_log(link->src, AV_LOG_ERROR,
96 "request_frame() called with no available frame!\n");
97 //return -1;
98 }
99
100 /* This picture will be needed unmodified later for decoding the next
101 * frame */
102 picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
103 AV_PERM_REUSE2,
104 link->w, link->h);
105
106 av_picture_copy((AVPicture *)&picref->data, (AVPicture *)&c->frame,
107 picref->pic->format, link->w, link->h);
108
109 picref->pts = c->pts;
110 picref->pixel_aspect = c->pixel_aspect;
111 picref->interlaced = c->frame.interlaced_frame;
112 picref->top_field_first = c->frame.top_field_first;
113 avfilter_start_frame(link, avfilter_ref_pic(picref, ~0));
114 avfilter_draw_slice(link, 0, link->h, 1);
115 avfilter_end_frame(link);
116 avfilter_unref_pic(picref);
117
118 c->has_frame = 0;
119
120 return 0;
121 }
122
123 static int poll_frame(AVFilterLink *link)
124 {
125 BufferSourceContext *c = link->src->priv;
126 return !!(c->has_frame);
127 }
128
129 AVFilter avfilter_vsrc_buffer =
130 {
131 .name = "buffer",
132 .priv_size = sizeof(BufferSourceContext),
133 .query_formats = query_formats,
134
135 .init = init,
136
137 .inputs = (AVFilterPad[]) {{ .name = NULL }},
138 .outputs = (AVFilterPad[]) {{ .name = "default",
139 .type = AVMEDIA_TYPE_VIDEO,
140 .request_frame = request_frame,
141 .poll_frame = poll_frame,
142 .config_props = config_props, },
143 { .name = NULL}},
144 };