2 * Copyright (c) 2003 Tobias Diedrich
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (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
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include "libavutil/imgutils.h"
25 typedef struct RepeatFieldsContext {
32 } RepeatFieldsContext;
34 static av_cold void uninit(AVFilterContext *ctx)
36 RepeatFieldsContext *s = ctx->priv;
38 av_frame_free(&s->frame);
41 static int query_formats(AVFilterContext *ctx)
43 static const enum AVPixelFormat pixel_fmts_eq[] = {
53 ff_set_common_formats(ctx, ff_make_format_list(pixel_fmts_eq));
58 static int config_input(AVFilterLink *inlink)
60 RepeatFieldsContext *s = inlink->dst->priv;
61 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
64 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
67 s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
68 s->planeheight[0] = s->planeheight[3] = inlink->h;
70 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
75 static void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
77 if (av_cmp_q(link->frame_rate, (AVRational){30000, 1001}) == 0 &&
78 av_cmp_q(link->time_base, (AVRational){1001, 60000}) <= 0
80 f->pts = pts + av_rescale_q(fields, (AVRational){1001, 60000}, link->time_base);
82 f->pts = AV_NOPTS_VALUE;
85 static int filter_frame(AVFilterLink *inlink, AVFrame *in) {
86 AVFilterContext *ctx = inlink->dst;
87 AVFilterLink *outlink = inlink->dst->outputs[0];
88 RepeatFieldsContext *s = ctx->priv;
94 s->frame = av_frame_clone(in);
96 return AVERROR(ENOMEM);
97 s->frame->pts = AV_NOPTS_VALUE;
102 if ((state == 0 && !in->top_field_first) ||
103 (state == 1 && in->top_field_first)) {
104 av_log(ctx, AV_LOG_WARNING, "Unexpected field flags: "
105 "state=%d top_field_first=%d repeat_first_field=%d\n",
106 state, in->top_field_first, in->repeat_pict);
113 new = av_frame_clone(in);
115 return AVERROR(ENOMEM);
117 ret = ff_filter_frame(outlink, new);
119 if (in->repeat_pict) {
120 av_frame_make_writable(out);
121 update_pts(outlink, out, in->pts, 2);
122 for (i = 0; i < s->nb_planes; i++) {
123 av_image_copy_plane(out->data[i], out->linesize[i] * 2,
124 in->data[i], in->linesize[i] * 2,
125 s->linesize[i], s->planeheight[i] / 2);
130 for (i = 0; i < s->nb_planes; i++) {
131 av_frame_make_writable(out);
132 av_image_copy_plane(out->data[i] + out->linesize[i], out->linesize[i] * 2,
133 in->data[i] + in->linesize[i], in->linesize[i] * 2,
134 s->linesize[i], s->planeheight[i] / 2);
137 ret = ff_filter_frame(outlink, av_frame_clone(out));
139 if (in->repeat_pict) {
142 new = av_frame_clone(in);
144 return AVERROR(ENOMEM);
146 ret = ff_filter_frame(outlink, new);
149 av_frame_make_writable(out);
150 update_pts(outlink, out, in->pts, 1);
151 for (i = 0; i < s->nb_planes; i++) {
152 av_image_copy_plane(out->data[i], out->linesize[i] * 2,
153 in->data[i], in->linesize[i] * 2,
154 s->linesize[i], s->planeheight[i] / 2);
165 static const AVFilterPad repeatfields_inputs[] = {
168 .type = AVMEDIA_TYPE_VIDEO,
169 .filter_frame = filter_frame,
170 .config_props = config_input,
175 static const AVFilterPad repeatfields_outputs[] = {
178 .type = AVMEDIA_TYPE_VIDEO,
183 AVFilter ff_vf_repeatfields = {
184 .name = "repeatfields",
185 .description = NULL_IF_CONFIG_SMALL("Hard repeat fields based on MPEG repeat field flag."),
186 .priv_size = sizeof(RepeatFieldsContext),
188 .inputs = repeatfields_inputs,
189 .outputs = repeatfields_outputs,
190 .query_formats = query_formats,