2 * Copyright (c) 2013 Paul B Mahol
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
21 #include "libavutil/imgutils.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
27 typedef struct WeaveContext {
37 #define OFFSET(x) offsetof(WeaveContext, x)
38 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
40 static const AVOption weave_options[] = {
41 { "first_field", "set first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
42 { "top", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
43 { "t", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
44 { "bottom", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
45 { "b", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
49 AVFILTER_DEFINE_CLASS(weave);
51 static int config_props_output(AVFilterLink *outlink)
53 AVFilterContext *ctx = outlink->src;
54 WeaveContext *s = ctx->priv;
55 AVFilterLink *inlink = ctx->inputs[0];
56 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
59 outlink->time_base.num = inlink->time_base.num * 2;
60 outlink->time_base.den = inlink->time_base.den;
61 outlink->frame_rate.num = inlink->frame_rate.num;
62 outlink->frame_rate.den = inlink->frame_rate.den * 2;
63 outlink->w = inlink->w;
64 outlink->h = inlink->h * 2;
66 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
69 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
70 s->planeheight[0] = s->planeheight[3] = inlink->h;
72 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
77 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
79 AVFilterContext *ctx = inlink->dst;
80 WeaveContext *s = ctx->priv;
81 AVFilterLink *outlink = ctx->outputs[0];
90 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
93 av_frame_free(&s->prev);
94 return AVERROR(ENOMEM);
96 av_frame_copy_props(out, in);
98 for (i = 0; i < s->nb_planes; i++) {
99 av_image_copy_plane(out->data[i] + out->linesize[i] * s->first_field,
100 out->linesize[i] * 2,
101 in->data[i], in->linesize[i],
102 s->linesize[i], s->planeheight[i]);
103 av_image_copy_plane(out->data[i] + out->linesize[i] * !s->first_field,
104 out->linesize[i] * 2,
105 s->prev->data[i], s->prev->linesize[i],
106 s->linesize[i], s->planeheight[i]);
109 out->pts = in->pts / 2;
110 out->interlaced_frame = 1;
111 out->top_field_first = !s->first_field;
114 av_frame_free(&s->prev);
115 return ff_filter_frame(outlink, out);
118 static av_cold void uninit(AVFilterContext *ctx)
120 WeaveContext *s = ctx->priv;
122 av_frame_free(&s->prev);
125 static const AVFilterPad weave_inputs[] = {
128 .type = AVMEDIA_TYPE_VIDEO,
129 .filter_frame = filter_frame,
134 static const AVFilterPad weave_outputs[] = {
137 .type = AVMEDIA_TYPE_VIDEO,
138 .config_props = config_props_output,
143 AVFilter ff_vf_weave = {
145 .description = NULL_IF_CONFIG_SMALL("Weave input video fields into frames."),
146 .priv_size = sizeof(WeaveContext),
147 .priv_class = &weave_class,
149 .inputs = weave_inputs,
150 .outputs = weave_outputs,