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"
26 typedef struct SeparateFieldsContext {
29 } SeparateFieldsContext;
31 static int config_props_output(AVFilterLink *outlink)
33 AVFilterContext *ctx = outlink->src;
34 SeparateFieldsContext *s = ctx->priv;
35 AVFilterLink *inlink = ctx->inputs[0];
37 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
40 av_log(ctx, AV_LOG_ERROR, "height must be even\n");
41 return AVERROR_INVALIDDATA;
44 outlink->time_base.num = inlink->time_base.num;
45 outlink->time_base.den = inlink->time_base.den * 2;
46 outlink->frame_rate.num = inlink->frame_rate.num * 2;
47 outlink->frame_rate.den = inlink->frame_rate.den;
48 outlink->w = inlink->w;
49 outlink->h = inlink->h / 2;
54 static void extract_field(AVFrame *frame, int nb_planes, int type)
58 for (i = 0; i < nb_planes; i++) {
60 frame->data[i] = frame->data[i] + frame->linesize[i];
61 frame->linesize[i] *= 2;
65 static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
67 AVFilterContext *ctx = inlink->dst;
68 SeparateFieldsContext *s = ctx->priv;
69 AVFilterLink *outlink = ctx->outputs[0];
72 inpicref->height = outlink->h;
73 inpicref->interlaced_frame = 0;
78 AVFrame *second = s->second;
80 extract_field(second, s->nb_planes, second->top_field_first);
82 if (second->pts != AV_NOPTS_VALUE &&
83 inpicref->pts != AV_NOPTS_VALUE)
84 second->pts += inpicref->pts;
86 second->pts = AV_NOPTS_VALUE;
88 ret = ff_filter_frame(outlink, second);
92 s->second = av_frame_clone(inpicref);
94 return AVERROR(ENOMEM);
97 extract_field(inpicref, s->nb_planes, !inpicref->top_field_first);
99 if (inpicref->pts != AV_NOPTS_VALUE)
102 return ff_filter_frame(outlink, inpicref);
105 static int flush_frame(AVFilterLink *outlink, int64_t pts, int64_t *out_pts)
107 AVFilterContext *ctx = outlink->src;
108 SeparateFieldsContext *s = ctx->priv;
112 *out_pts = s->second->pts += pts;
113 extract_field(s->second, s->nb_planes, s->second->top_field_first);
114 ret = ff_filter_frame(outlink, s->second);
121 static int activate(AVFilterContext *ctx)
123 AVFilterLink *inlink = ctx->inputs[0];
124 AVFilterLink *outlink = ctx->outputs[0];
129 FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
131 ret = ff_inlink_consume_frame(inlink, &in);
135 return filter_frame(inlink, in);
137 if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
138 if (status == AVERROR_EOF) {
139 int64_t out_pts = pts;
141 ret = flush_frame(outlink, pts, &out_pts);
142 ff_outlink_set_status(outlink, status, out_pts);
147 FF_FILTER_FORWARD_WANTED(outlink, inlink);
149 return FFERROR_NOT_READY;
152 static av_cold void uninit(AVFilterContext *ctx)
154 SeparateFieldsContext *s = ctx->priv;
156 av_frame_free(&s->second);
159 static const AVFilterPad separatefields_inputs[] = {
162 .type = AVMEDIA_TYPE_VIDEO,
167 static const AVFilterPad separatefields_outputs[] = {
170 .type = AVMEDIA_TYPE_VIDEO,
171 .config_props = config_props_output,
176 const AVFilter ff_vf_separatefields = {
177 .name = "separatefields",
178 .description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."),
179 .priv_size = sizeof(SeparateFieldsContext),
180 .activate = activate,
182 .inputs = separatefields_inputs,
183 .outputs = separatefields_outputs,