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/pixdesc.h"
28 } SeparateFieldsContext;
30 static int config_props_output(AVFilterLink *outlink)
32 AVFilterContext *ctx = outlink->src;
33 SeparateFieldsContext *sf = ctx->priv;
34 AVFilterLink *inlink = ctx->inputs[0];
36 sf->nb_planes = av_pix_fmt_count_planes(inlink->format);
39 av_log(ctx, AV_LOG_ERROR, "height must be even\n");
40 return AVERROR_INVALIDDATA;
43 outlink->time_base.num = inlink->time_base.num;
44 outlink->time_base.den = inlink->time_base.den * 2;
45 outlink->frame_rate.num = inlink->frame_rate.num * 2;
46 outlink->frame_rate.den = inlink->frame_rate.den;
47 outlink->w = inlink->w;
48 outlink->h = inlink->h / 2;
49 sf->ts_unit = av_q2d(av_inv_q(av_mul_q(outlink->frame_rate, outlink->time_base)));
54 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
56 AVFilterContext *ctx = inlink->dst;
57 SeparateFieldsContext *sf = ctx->priv;
58 AVFilterLink *outlink = ctx->outputs[0];
62 inpicref->height = outlink->h;
63 inpicref->interlaced_frame = 0;
65 second = av_frame_clone(inpicref);
67 return AVERROR(ENOMEM);
69 for (i = 0; i < sf->nb_planes; i++) {
70 if (!inpicref->top_field_first)
71 inpicref->data[i] = inpicref->data[i] + inpicref->linesize[i];
73 second->data[i] = second->data[i] + second->linesize[i];
74 inpicref->linesize[i] *= 2;
75 second->linesize[i] *= 2;
78 inpicref->pts = outlink->frame_count * sf->ts_unit;
79 ret = ff_filter_frame(outlink, inpicref);
81 av_frame_free(&second);
85 second->pts = outlink->frame_count * sf->ts_unit;
86 return ff_filter_frame(outlink, second);
89 static const AVFilterPad separatefields_inputs[] = {
92 .type = AVMEDIA_TYPE_VIDEO,
93 .filter_frame = filter_frame,
98 static const AVFilterPad separatefields_outputs[] = {
101 .type = AVMEDIA_TYPE_VIDEO,
102 .config_props = config_props_output,
107 AVFilter avfilter_vf_separatefields = {
108 .name = "separatefields",
109 .description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."),
110 .priv_size = sizeof(SeparateFieldsContext),
111 .inputs = separatefields_inputs,
112 .outputs = separatefields_outputs,