Fix style: "if(" -> "if (".
[libav.git] / libavfilter / vsrc_buffer.c
1 /*
2 * Copyright (c) 2008 Vitor Sessak
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * memory buffer source filter
24 */
25
26 #include "avfilter.h"
27 #include "vsrc_buffer.h"
28 #include "libavutil/pixdesc.h"
29
30 typedef struct {
31 int64_t pts;
32 AVFrame frame;
33 int has_frame;
34 int h, w;
35 enum PixelFormat pix_fmt;
36 AVRational pixel_aspect;
37 } BufferSourceContext;
38
39 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
40 int64_t pts, AVRational pixel_aspect)
41 {
42 BufferSourceContext *c = buffer_filter->priv;
43
44 if (c->has_frame) {
45 av_log(buffer_filter, AV_LOG_ERROR,
46 "Buffering several frames is not supported. "
47 "Please consume all available frames before adding a new one.\n"
48 );
49 //return -1;
50 }
51
52 memcpy(c->frame.data , frame->data , sizeof(frame->data));
53 memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
54 c->frame.interlaced_frame= frame->interlaced_frame;
55 c->frame.top_field_first = frame->top_field_first;
56 c->pts = pts;
57 c->pixel_aspect = pixel_aspect;
58 c->has_frame = 1;
59
60 return 0;
61 }
62
63 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
64 {
65 BufferSourceContext *c = ctx->priv;
66 char pix_fmt_str[128];
67 int n = 0;
68
69 if (!args || (n = sscanf(args, "%d:%d:%127s", &c->w, &c->h, pix_fmt_str)) != 3) {
70 av_log(ctx, AV_LOG_ERROR, "Expected 3 arguments, but only %d found in '%s'\n", n, args ? args : "");
71 return AVERROR(EINVAL);
72 }
73 if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
74 char *tail;
75 c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
76 if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
77 av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
78 return AVERROR(EINVAL);
79 }
80 }
81
82 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);
83 return 0;
84 }
85
86 static int query_formats(AVFilterContext *ctx)
87 {
88 BufferSourceContext *c = ctx->priv;
89 enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
90
91 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
92 return 0;
93 }
94
95 static int config_props(AVFilterLink *link)
96 {
97 BufferSourceContext *c = link->src->priv;
98
99 link->w = c->w;
100 link->h = c->h;
101
102 return 0;
103 }
104
105 static int request_frame(AVFilterLink *link)
106 {
107 BufferSourceContext *c = link->src->priv;
108 AVFilterPicRef *picref;
109
110 if (!c->has_frame) {
111 av_log(link->src, AV_LOG_ERROR,
112 "request_frame() called with no available frame!\n");
113 //return -1;
114 }
115
116 /* This picture will be needed unmodified later for decoding the next
117 * frame */
118 picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
119 AV_PERM_REUSE2,
120 link->w, link->h);
121
122 av_picture_copy((AVPicture *)&picref->data, (AVPicture *)&c->frame,
123 picref->pic->format, link->w, link->h);
124
125 picref->pts = c->pts;
126 picref->pixel_aspect = c->pixel_aspect;
127 picref->interlaced = c->frame.interlaced_frame;
128 picref->top_field_first = c->frame.top_field_first;
129 avfilter_start_frame(link, avfilter_ref_pic(picref, ~0));
130 avfilter_draw_slice(link, 0, link->h, 1);
131 avfilter_end_frame(link);
132 avfilter_unref_pic(picref);
133
134 c->has_frame = 0;
135
136 return 0;
137 }
138
139 static int poll_frame(AVFilterLink *link)
140 {
141 BufferSourceContext *c = link->src->priv;
142 return !!(c->has_frame);
143 }
144
145 AVFilter avfilter_vsrc_buffer = {
146 .name = "buffer",
147 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
148 .priv_size = sizeof(BufferSourceContext),
149 .query_formats = query_formats,
150
151 .init = init,
152
153 .inputs = (AVFilterPad[]) {{ .name = NULL }},
154 .outputs = (AVFilterPad[]) {{ .name = "default",
155 .type = AVMEDIA_TYPE_VIDEO,
156 .request_frame = request_frame,
157 .poll_frame = poll_frame,
158 .config_props = config_props, },
159 { .name = NULL}},
160 };