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/imgutils.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
27 typedef struct WeaveContext {
38 #define OFFSET(x) offsetof(WeaveContext, x)
39 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
41 static const AVOption weave_options[] = {
42 { "first_field", "set first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
43 { "top", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
44 { "t", "set top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
45 { "bottom", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
46 { "b", "set bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
50 AVFILTER_DEFINE_CLASS(weave);
52 static int query_formats(AVFilterContext *ctx)
54 AVFilterFormats *formats = NULL;
57 ret = ff_formats_pixdesc_filter(&formats, 0,
59 AV_PIX_FMT_FLAG_HWACCEL);
62 return ff_set_common_formats(ctx, formats);
65 static int config_props_output(AVFilterLink *outlink)
67 AVFilterContext *ctx = outlink->src;
68 WeaveContext *s = ctx->priv;
69 AVFilterLink *inlink = ctx->inputs[0];
70 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
73 if (!s->double_weave) {
74 outlink->time_base.num = inlink->time_base.num * 2;
75 outlink->time_base.den = inlink->time_base.den;
76 outlink->frame_rate.num = inlink->frame_rate.num;
77 outlink->frame_rate.den = inlink->frame_rate.den * 2;
79 outlink->w = inlink->w;
80 outlink->h = inlink->h * 2;
82 if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
85 s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
86 s->planeheight[0] = s->planeheight[3] = inlink->h;
88 s->nb_planes = av_pix_fmt_count_planes(inlink->format);
93 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
95 AVFilterContext *ctx = inlink->dst;
96 WeaveContext *s = ctx->priv;
97 AVFilterLink *outlink = ctx->outputs[0];
108 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
111 av_frame_free(&s->prev);
112 return AVERROR(ENOMEM);
114 av_frame_copy_props(out, in);
116 weave = (s->double_weave && !(inlink->frame_count_out & 1));
117 field1 = weave ? s->first_field : (!s->first_field);
118 field2 = weave ? (!s->first_field) : s->first_field;
119 for (i = 0; i < s->nb_planes; i++) {
120 av_image_copy_plane(out->data[i] + out->linesize[i] * field1,
121 out->linesize[i] * 2,
122 in->data[i], in->linesize[i],
123 s->linesize[i], s->planeheight[i]);
124 av_image_copy_plane(out->data[i] + out->linesize[i] * field2,
125 out->linesize[i] * 2,
126 s->prev->data[i], s->prev->linesize[i],
127 s->linesize[i], s->planeheight[i]);
130 out->pts = s->double_weave ? s->prev->pts : in->pts / 2;
131 out->interlaced_frame = 1;
132 out->top_field_first = !s->first_field;
134 if (!s->double_weave)
136 av_frame_free(&s->prev);
139 return ff_filter_frame(outlink, out);
142 static av_cold void uninit(AVFilterContext *ctx)
144 WeaveContext *s = ctx->priv;
146 av_frame_free(&s->prev);
149 static const AVFilterPad weave_inputs[] = {
152 .type = AVMEDIA_TYPE_VIDEO,
153 .filter_frame = filter_frame,
158 static const AVFilterPad weave_outputs[] = {
161 .type = AVMEDIA_TYPE_VIDEO,
162 .config_props = config_props_output,
167 AVFilter ff_vf_weave = {
169 .description = NULL_IF_CONFIG_SMALL("Weave input video fields into frames."),
170 .priv_size = sizeof(WeaveContext),
171 .priv_class = &weave_class,
172 .query_formats = query_formats,
174 .inputs = weave_inputs,
175 .outputs = weave_outputs,
178 static av_cold int init(AVFilterContext *ctx)
180 WeaveContext *s = ctx->priv;
182 if (!strcmp(ctx->filter->name, "doubleweave"))
188 #define doubleweave_options weave_options
189 AVFILTER_DEFINE_CLASS(doubleweave);
191 AVFilter ff_vf_doubleweave = {
192 .name = "doubleweave",
193 .description = NULL_IF_CONFIG_SMALL("Weave input video fields into double number of frames."),
194 .priv_size = sizeof(WeaveContext),
195 .priv_class = &doubleweave_class,
196 .query_formats = query_formats,
199 .inputs = weave_inputs,
200 .outputs = weave_outputs,