2 * Copyright (c) 2008 Vitor Sessak
4 * This file is part of FFmpeg.
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.
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.
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
23 * memory buffer source filter
27 #include "vsrc_buffer.h"
28 #include "libavcore/imgutils.h"
35 enum PixelFormat pix_fmt;
36 AVRational pixel_aspect;
37 } BufferSourceContext;
39 int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
40 int64_t pts, AVRational pixel_aspect)
42 BufferSourceContext *c = buffer_filter->priv;
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"
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;
57 c->pixel_aspect = pixel_aspect;
63 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
65 BufferSourceContext *c = ctx->priv;
66 char pix_fmt_str[128];
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);
73 if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
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);
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);
86 static int query_formats(AVFilterContext *ctx)
88 BufferSourceContext *c = ctx->priv;
89 enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
91 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
95 static int config_props(AVFilterLink *link)
97 BufferSourceContext *c = link->src->priv;
105 static int request_frame(AVFilterLink *link)
107 BufferSourceContext *c = link->src->priv;
108 AVFilterBufferRef *picref;
111 av_log(link->src, AV_LOG_ERROR,
112 "request_frame() called with no available frame!\n");
116 /* This picture will be needed unmodified later for decoding the next
118 picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
122 av_image_copy(picref->data, picref->linesize,
123 c->frame.data, c->frame.linesize,
124 picref->format, link->w, link->h);
126 picref->pts = c->pts;
127 picref->video->pixel_aspect = c->pixel_aspect;
128 picref->video->interlaced = c->frame.interlaced_frame;
129 picref->video->top_field_first = c->frame.top_field_first;
130 avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));
131 avfilter_draw_slice(link, 0, link->h, 1);
132 avfilter_end_frame(link);
133 avfilter_unref_buffer(picref);
140 static int poll_frame(AVFilterLink *link)
142 BufferSourceContext *c = link->src->priv;
143 return !!(c->has_frame);
146 AVFilter avfilter_vsrc_buffer = {
148 .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
149 .priv_size = sizeof(BufferSourceContext),
150 .query_formats = query_formats,
154 .inputs = (AVFilterPad[]) {{ .name = NULL }},
155 .outputs = (AVFilterPad[]) {{ .name = "default",
156 .type = AVMEDIA_TYPE_VIDEO,
157 .request_frame = request_frame,
158 .poll_frame = poll_frame,
159 .config_props = config_props, },