982fed5f7a60d044d1f1a537a71a2b21e0f2afb8
[libav.git] / libavfilter / vsrc_buffer.c
1 /*
2 * Copyright (c) 2008 Vitor Sessak
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; 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/imgutils.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 time_base; ///< time_base to set in the output link
37 AVRational pixel_aspect;
38 } BufferSourceContext;
39
40 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
41 int64_t pts, AVRational pixel_aspect)
42 {
43 BufferSourceContext *c = buffer_filter->priv;
44
45 if (c->has_frame) {
46 av_log(buffer_filter, AV_LOG_ERROR,
47 "Buffering several frames is not supported. "
48 "Please consume all available frames before adding a new one.\n"
49 );
50 //return -1;
51 }
52
53 memcpy(c->frame.data , frame->data , sizeof(frame->data));
54 memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
55 c->frame.interlaced_frame= frame->interlaced_frame;
56 c->frame.top_field_first = frame->top_field_first;
57 c->frame.key_frame = frame->key_frame;
58 c->frame.pict_type = frame->pict_type;
59 c->pts = pts;
60 c->pixel_aspect = pixel_aspect;
61 c->has_frame = 1;
62
63 return 0;
64 }
65
66 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
67 {
68 BufferSourceContext *c = ctx->priv;
69 char pix_fmt_str[128];
70 int n = 0;
71
72 if (!args ||
73 (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
74 &c->time_base.num, &c->time_base.den,
75 &c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
76 av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %d found in '%s'\n", n, args);
77 return AVERROR(EINVAL);
78 }
79 if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
80 char *tail;
81 c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
82 if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
83 av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
84 return AVERROR(EINVAL);
85 }
86 }
87
88 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);
89 return 0;
90 }
91
92 static int query_formats(AVFilterContext *ctx)
93 {
94 BufferSourceContext *c = ctx->priv;
95 enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
96
97 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
98 return 0;
99 }
100
101 static int config_props(AVFilterLink *link)
102 {
103 BufferSourceContext *c = link->src->priv;
104
105 link->w = c->w;
106 link->h = c->h;
107 link->sample_aspect_ratio = c->pixel_aspect;
108 link->time_base = c->time_base;
109
110 return 0;
111 }
112
113 static int request_frame(AVFilterLink *link)
114 {
115 BufferSourceContext *c = link->src->priv;
116 AVFilterBufferRef *picref;
117
118 if (!c->has_frame) {
119 av_log(link->src, AV_LOG_ERROR,
120 "request_frame() called with no available frame!\n");
121 //return -1;
122 }
123
124 /* This picture will be needed unmodified later for decoding the next
125 * frame */
126 picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
127 AV_PERM_REUSE2,
128 link->w, link->h);
129
130 av_image_copy(picref->data, picref->linesize,
131 c->frame.data, c->frame.linesize,
132 picref->format, link->w, link->h);
133
134 avfilter_copy_frame_props(picref, &c->frame);
135 picref->pts = c->pts;
136 picref->video->pixel_aspect = c->pixel_aspect;
137 avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
138 avfilter_draw_slice(link, 0, link->h, 1);
139 avfilter_end_frame(link);
140 avfilter_unref_buffer(picref);
141
142 c->has_frame = 0;
143
144 return 0;
145 }
146
147 static int poll_frame(AVFilterLink *link)
148 {
149 BufferSourceContext *c = link->src->priv;
150 return !!(c->has_frame);
151 }
152
153 AVFilter avfilter_vsrc_buffer = {
154 .name = "buffer",
155 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
156 .priv_size = sizeof(BufferSourceContext),
157 .query_formats = query_formats,
158
159 .init = init,
160
161 .inputs = (AVFilterPad[]) {{ .name = NULL }},
162 .outputs = (AVFilterPad[]) {{ .name = "default",
163 .type = AVMEDIA_TYPE_VIDEO,
164 .request_frame = request_frame,
165 .poll_frame = poll_frame,
166 .config_props = config_props, },
167 { .name = NULL}},
168 };