path: root/libavfilter/vf_repeatfields.c (plain)
blob: 3ac432b5bc4927a06b031ff12c58c045c68cf7b7

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
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 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
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
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
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