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"
27 typedef struct SeparateFieldsContext {
30 } SeparateFieldsContext;
32 static int config_props_output(AVFilterLink *outlink)
34 AVFilterContext *ctx = outlink->src;
35 SeparateFieldsContext *s = ctx->priv;
36 AVFilterLink *inlink = ctx->inputs[0];
38 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
41 av_log(ctx, AV_LOG_ERROR, "height must be even\n");
42 return AVERROR_INVALIDDATA;
45 outlink->time_base.num = inlink->time_base.num;
46 outlink->time_base.den = inlink->time_base.den * 2;
47 outlink->frame_rate.num = inlink->frame_rate.num * 2;
48 outlink->frame_rate.den = inlink->frame_rate.den;
49 outlink->w = inlink->w;
50 outlink->h = inlink->h / 2;
55 static void extract_field(AVFrame *frame, int nb_planes, int type)
59 for (i = 0; i < nb_planes; i++) {
61 frame->data[i] = frame->data[i] + frame->linesize[i];
62 frame->linesize[i] *= 2;
66 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
68 AVFilterContext *ctx = inlink->dst;
69 SeparateFieldsContext *s = ctx->priv;
70 AVFilterLink *outlink = ctx->outputs[0];
73 inpicref->height = outlink->h;
74 #if FF_API_INTERLACED_FRAME
75 FF_DISABLE_DEPRECATION_WARNINGS
76 inpicref->interlaced_frame = 0;
77 FF_ENABLE_DEPRECATION_WARNINGS
79 inpicref->flags &= ~AV_FRAME_FLAG_INTERLACED;
84 AVFrame *second = s->second;
86 extract_field(second, s->nb_planes, !!(second->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST));
88 if (second->pts != AV_NOPTS_VALUE &&
89 inpicref->pts != AV_NOPTS_VALUE)
90 second->pts += inpicref->pts;
92 second->pts = AV_NOPTS_VALUE;
94 ret = ff_filter_frame(outlink, second);
98 s->second = av_frame_clone(inpicref);
100 return AVERROR(ENOMEM);
103 extract_field(inpicref, s->nb_planes, !(inpicref->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST));
105 if (inpicref->pts != AV_NOPTS_VALUE)
108 return ff_filter_frame(outlink, inpicref);
111 static int flush_frame(AVFilterLink *outlink, int64_t pts, int64_t *out_pts)
113 AVFilterContext *ctx = outlink->src;
114 SeparateFieldsContext *s = ctx->priv;
118 *out_pts = s->second->pts += pts;
119 extract_field(s->second, s->nb_planes, !!(s->second->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST));
120 ret = ff_filter_frame(outlink, s->second);
127 static int activate(AVFilterContext *ctx)
129 AVFilterLink *inlink = ctx->inputs[0];
130 AVFilterLink *outlink = ctx->outputs[0];
135 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
137 ret = ff_inlink_consume_frame(inlink, &in);
141 return filter_frame(inlink, in);
143 if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
144 if (status == AVERROR_EOF) {
145 int64_t out_pts = pts;
147 ret = flush_frame(outlink, pts, &out_pts);
148 ff_outlink_set_status(outlink, status, out_pts);
153 FF_FILTER_FORWARD_WANTED(outlink, inlink);
155 return FFERROR_NOT_READY;
158 static av_cold void uninit(AVFilterContext *ctx)
160 SeparateFieldsContext *s = ctx->priv;
162 av_frame_free(&s->second);
165 static const AVFilterPad separatefields_outputs[] = {
168 .type = AVMEDIA_TYPE_VIDEO,
169 .config_props = config_props_output,
173 const AVFilter ff_vf_separatefields = {
174 .name = "separatefields",
175 .description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."),
176 .priv_size = sizeof(SeparateFieldsContext),
177 .activate = activate,
179 FILTER_INPUTS(ff_video_default_filterpad),
180 FILTER_OUTPUTS(separatefields_outputs),