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
query_formats(AVFilterContext * ctx)41 static int query_formats(AVFilterContext *ctx)
42 {
43 static const enum AVPixelFormat pixel_fmts_eq[] = {
44 AV_PIX_FMT_GRAY8,
45 AV_PIX_FMT_YUV410P,
46 AV_PIX_FMT_YUV411P,
47 AV_PIX_FMT_YUV420P,
48 AV_PIX_FMT_YUV422P,
49 AV_PIX_FMT_YUV444P,
50 AV_PIX_FMT_NONE
51 };
52
53 AVFilterFormats *fmts_list = ff_make_format_list(pixel_fmts_eq);
54 if (!fmts_list)
55 return AVERROR(ENOMEM);
56 return ff_set_common_formats(ctx, fmts_list);
57 }
58
config_input(AVFilterLink * inlink)59 static int config_input(AVFilterLink *inlink)
60 {
61 RepeatFieldsContext *s = inlink->dst->priv;
62 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
63 int ret;
64
65 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
66 return ret;
67
68 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
69 s->planeheight[0] = s->planeheight[3] = inlink->h;
70
71 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
72
73 return 0;
74 }
75
update_pts(AVFilterLink * link,AVFrame * f,int64_t pts,int fields)76 static void update_pts(AVFilterLink *link, AVFrame *f, int64_t pts, int fields)
77 {
78 if (av_cmp_q(link->frame_rate, (AVRational){30000, 1001}) == 0 &&
79 av_cmp_q(link->time_base, (AVRational){1001, 60000}) <= 0
80 ) {
81 f->pts = pts + av_rescale_q(fields, (AVRational){1001, 60000}, link->time_base);
82 } else
83 f->pts = AV_NOPTS_VALUE;
84 }
85
filter_frame(AVFilterLink * inlink,AVFrame * in)86 static int filter_frame(AVFilterLink *inlink, AVFrame *in) {
87 AVFilterContext *ctx = inlink->dst;
88 AVFilterLink *outlink = inlink->dst->outputs[0];
89 RepeatFieldsContext *s = ctx->priv;
90 AVFrame *out;
91 int ret, i;
92 int state = s->state;
93
94 if (!s->frame) {
95 s->frame = av_frame_clone(in);
96 if (!s->frame)
97 return AVERROR(ENOMEM);
98 s->frame->pts = AV_NOPTS_VALUE;
99 }
100
101 out = s->frame;
102
103 if ((state == 0 && !in->top_field_first) ||
104 (state == 1 && in->top_field_first)) {
105 av_log(ctx, AV_LOG_WARNING, "Unexpected field flags: "
106 "state=%d top_field_first=%d repeat_first_field=%d\n",
107 state, in->top_field_first, in->repeat_pict);
108 state ^= 1;
109 }
110
111 if (state == 0) {
112 AVFrame *new;
113
114 new = av_frame_clone(in);
115 if (!new)
116 return AVERROR(ENOMEM);
117
118 ret = ff_filter_frame(outlink, new);
119
120 if (in->repeat_pict) {
121 av_frame_make_writable(out);
122 update_pts(outlink, out, in->pts, 2);
123 for (i = 0; i < s->nb_planes; i++) {
124 av_image_copy_plane(out->data[i], out->linesize[i] * 2,
125 in->data[i], in->linesize[i] * 2,
126 s->linesize[i], s->planeheight[i] / 2);
127 }
128 state = 1;
129 }
130 } else {
131 for (i = 0; i < s->nb_planes; i++) {
132 av_frame_make_writable(out);
133 av_image_copy_plane(out->data[i] + out->linesize[i], out->linesize[i] * 2,
134 in->data[i] + in->linesize[i], in->linesize[i] * 2,
135 s->linesize[i], s->planeheight[i] / 2);
136 }
137
138 ret = ff_filter_frame(outlink, av_frame_clone(out));
139
140 if (in->repeat_pict) {
141 AVFrame *new;
142
143 new = av_frame_clone(in);
144 if (!new)
145 return AVERROR(ENOMEM);
146
147 ret = ff_filter_frame(outlink, new);
148 state = 0;
149 } else {
150 av_frame_make_writable(out);
151 update_pts(outlink, out, in->pts, 1);
152 for (i = 0; i < s->nb_planes; i++) {
153 av_image_copy_plane(out->data[i], out->linesize[i] * 2,
154 in->data[i], in->linesize[i] * 2,
155 s->linesize[i], s->planeheight[i] / 2);
156 }
157 }
158 }
159
160 s->state = state;
161
162 av_frame_free(&in);
163 return ret;
164 }
165
166 static const AVFilterPad repeatfields_inputs[] = {
167 {
168 .name = "default",
169 .type = AVMEDIA_TYPE_VIDEO,
170 .filter_frame = filter_frame,
171 .config_props = config_input,
172 },
173 { NULL }
174 };
175
176 static const AVFilterPad repeatfields_outputs[] = {
177 {
178 .name = "default",
179 .type = AVMEDIA_TYPE_VIDEO,
180 },
181 { NULL }
182 };
183
184 AVFilter ff_vf_repeatfields = {
185 .name = "repeatfields",
186 .description = NULL_IF_CONFIG_SMALL("Hard repeat fields based on MPEG repeat field flag."),
187 .priv_size = sizeof(RepeatFieldsContext),
188 .uninit = uninit,
189 .inputs = repeatfields_inputs,
190 .outputs = repeatfields_outputs,
191 .query_formats = query_formats,
192 };
193