1 /*
2 * Copyright (c) 2003 Tobias Diedrich
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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.
19 */
20
21 #include "libavutil/imgutils.h"
22 #include "avfilter.h"
23 #include "internal.h"
24
25 typedef struct RepeatFieldsContext {
26 const AVClass *class;
27 int state;
28 int nb_planes;
29 int linesize[4];
30 int planeheight[4];
31 AVFrame *frame;
32 } RepeatFieldsContext;
33
uninit(AVFilterContext * ctx)34 static av_cold void uninit(AVFilterContext *ctx)
35 {
36 RepeatFieldsContext *s = ctx->priv;
37
38 av_frame_free(&s->frame);
39 }
40
41 static const enum AVPixelFormat pixel_fmts_eq[] = {
42 AV_PIX_FMT_GRAY8,
43 AV_PIX_FMT_YUV410P,
44 AV_PIX_FMT_YUV411P,
45 AV_PIX_FMT_YUV420P,
46 AV_PIX_FMT_YUV422P,
47 AV_PIX_FMT_YUV444P,
48 AV_PIX_FMT_NONE
49 };
50
config_input(AVFilterLink * inlink)51 static int config_input(AVFilterLink *inlink)
52 {
53 RepeatFieldsContext *s = inlink->dst->priv;
54 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
55 int ret;
56
57 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
58 return ret;
59
60 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
61 s->planeheight[0] = s->planeheight[3] = inlink->h;
62
63 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
64
65 return 0;
66 }
67
update_pts(AVFilterLink * link,AVFrame * f,int64_t pts,int fields)68 static void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
69 {
70 if (av_cmp_q(link->frame_rate, (AVRational){30000, 1001}) == 0 &&
71 av_cmp_q(link->time_base, (AVRational){1001, 60000}) <= 0
72 ) {
73 f->pts = pts + av_rescale_q(fields, (AVRational){1001, 60000}, link->time_base);
74 } else
75 f->pts = AV_NOPTS_VALUE;
76 }
77
filter_frame(AVFilterLink * inlink,AVFrame * in)78 static int filter_frame(AVFilterLink *inlink, AVFrame *in) {
79 AVFilterContext *ctx = inlink->dst;
80 AVFilterLink *outlink = inlink->dst->outputs[0];
81 RepeatFieldsContext *s = ctx->priv;
82 AVFrame *out;
83 int ret, i;
84 int state = s->state;
85
86 if (!s->frame) {
87 s->frame = av_frame_clone(in);
88 if (!s->frame)
89 return AVERROR(ENOMEM);
90 s->frame->pts = AV_NOPTS_VALUE;
91 }
92
93 out = s->frame;
94
95 if ((state == 0 && !in->top_field_first) ||
96 (state == 1 && in->top_field_first)) {
97 av_log(ctx, AV_LOG_WARNING, "Unexpected field flags: "
98 "state=%d top_field_first=%d repeat_first_field=%d\n",
99 state, in->top_field_first, in->repeat_pict);
100 state ^= 1;
101 }
102
103 if (state == 0) {
104 AVFrame *new;
105
106 new = av_frame_clone(in);
107 if (!new)
108 return AVERROR(ENOMEM);
109
110 ret = ff_filter_frame(outlink, new);
111
112 if (in->repeat_pict) {
113 av_frame_make_writable(out);
114 update_pts(outlink, out, in->pts, 2);
115 for (i = 0; i < s->nb_planes; i++) {
116 av_image_copy_plane(out->data[i], out->linesize[i] * 2,
117 in->data[i], in->linesize[i] * 2,
118 s->linesize[i], s->planeheight[i] / 2);
119 }
120 state = 1;
121 }
122 } else {
123 for (i = 0; i < s->nb_planes; i++) {
124 av_frame_make_writable(out);
125 av_image_copy_plane(out->data[i] + out->linesize[i], out->linesize[i] * 2,
126 in->data[i] + in->linesize[i], in->linesize[i] * 2,
127 s->linesize[i], s->planeheight[i] / 2);
128 }
129
130 ret = ff_filter_frame(outlink, av_frame_clone(out));
131
132 if (in->repeat_pict) {
133 AVFrame *new;
134
135 new = av_frame_clone(in);
136 if (!new)
137 return AVERROR(ENOMEM);
138
139 ret = ff_filter_frame(outlink, new);
140 state = 0;
141 } else {
142 av_frame_make_writable(out);
143 update_pts(outlink, out, in->pts, 1);
144 for (i = 0; i < s->nb_planes; i++) {
145 av_image_copy_plane(out->data[i], out->linesize[i] * 2,
146 in->data[i], in->linesize[i] * 2,
147 s->linesize[i], s->planeheight[i] / 2);
148 }
149 }
150 }
151
152 s->state = state;
153
154 av_frame_free(&in);
155 return ret;
156 }
157
158 static const AVFilterPad repeatfields_inputs[] = {
159 {
160 .name = "default",
161 .type = AVMEDIA_TYPE_VIDEO,
162 .filter_frame = filter_frame,
163 .config_props = config_input,
164 },
165 };
166
167 static const AVFilterPad repeatfields_outputs[] = {
168 {
169 .name = "default",
170 .type = AVMEDIA_TYPE_VIDEO,
171 },
172 };
173
174 const AVFilter ff_vf_repeatfields = {
175 .name = "repeatfields",
176 .description = NULL_IF_CONFIG_SMALL("Hard repeat fields based on MPEG repeat field flag."),
177 .priv_size = sizeof(RepeatFieldsContext),
178 .uninit = uninit,
179 FILTER_INPUTS(repeatfields_inputs),
180 FILTER_OUTPUTS(repeatfields_outputs),
181 FILTER_PIXFMTS_ARRAY(pixel_fmts_eq),
182 };
183