avfilter: add doubleweave filter
[ffmpeg.git] / libavfilter / vf_weave.c
1 /*
2  * Copyright (c) 2013 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
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.
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 GNU
14  * Lesser General Public License for more details.
15  *
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
19  */
20
21 #include "libavutil/imgutils.h"
22 #include "libavutil/opt.h"
23 #include "libavutil/pixdesc.h"
24 #include "avfilter.h"
25 #include "internal.h"
26
27 typedef struct WeaveContext {
28     const AVClass *class;
29     int first_field;
30     int double_weave;
31     int nb_planes;
32     int planeheight[4];
33     int linesize[4];
34
35     AVFrame *prev;
36 } WeaveContext;
37
38 #define OFFSET(x) offsetof(WeaveContext, x)
39 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
40
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"},
47     { NULL }
48 };
49
50 AVFILTER_DEFINE_CLASS(weave);
51
52 static int config_props_output(AVFilterLink *outlink)
53 {
54     AVFilterContext *ctx = outlink->src;
55     WeaveContext *s = ctx->priv;
56     AVFilterLink *inlink = ctx->inputs[0];
57     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
58     int ret;
59
60     if (!s->double_weave) {
61         outlink->time_base.num = inlink->time_base.num * 2;
62         outlink->time_base.den = inlink->time_base.den;
63         outlink->frame_rate.num = inlink->frame_rate.num;
64         outlink->frame_rate.den = inlink->frame_rate.den * 2;
65     }
66     outlink->w = inlink->w;
67     outlink->h = inlink->h * 2;
68
69     if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0)
70         return ret;
71
72     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
73     s->planeheight[0] = s->planeheight[3] = inlink->h;
74
75     s->nb_planes = av_pix_fmt_count_planes(inlink->format);
76
77     return 0;
78 }
79
80 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
81 {
82     AVFilterContext *ctx = inlink->dst;
83     WeaveContext *s = ctx->priv;
84     AVFilterLink *outlink = ctx->outputs[0];
85     AVFrame *out;
86     int i;
87
88     if (!s->prev) {
89         s->prev = in;
90         return 0;
91     }
92
93     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
94     if (!out) {
95         av_frame_free(&in);
96         av_frame_free(&s->prev);
97         return AVERROR(ENOMEM);
98     }
99     av_frame_copy_props(out, in);
100
101     for (i = 0; i < s->nb_planes; i++) {
102         if (s->double_weave && !(inlink->frame_count_out & 1)) {
103             av_image_copy_plane(out->data[i] + out->linesize[i] * !s->first_field,
104                                 out->linesize[i] * 2,
105                                 in->data[i], in->linesize[i],
106                                 s->linesize[i], s->planeheight[i]);
107             av_image_copy_plane(out->data[i] + out->linesize[i] * s->first_field,
108                                 out->linesize[i] * 2,
109                                 s->prev->data[i], s->prev->linesize[i],
110                                 s->linesize[i], s->planeheight[i]);
111         } else {
112             av_image_copy_plane(out->data[i] + out->linesize[i] * s->first_field,
113                                 out->linesize[i] * 2,
114                                 in->data[i], in->linesize[i],
115                                 s->linesize[i], s->planeheight[i]);
116             av_image_copy_plane(out->data[i] + out->linesize[i] * !s->first_field,
117                                 out->linesize[i] * 2,
118                                 s->prev->data[i], s->prev->linesize[i],
119                                 s->linesize[i], s->planeheight[i]);
120         }
121     }
122
123     out->pts = s->double_weave ? s->prev->pts : in->pts / 2;
124     out->interlaced_frame = 1;
125     out->top_field_first = !s->first_field;
126
127     if (!s->double_weave)
128         av_frame_free(&in);
129     av_frame_free(&s->prev);
130     if (s->double_weave)
131         s->prev = in;
132     return ff_filter_frame(outlink, out);
133 }
134
135 static av_cold void uninit(AVFilterContext *ctx)
136 {
137     WeaveContext *s = ctx->priv;
138
139     av_frame_free(&s->prev);
140 }
141
142 static const AVFilterPad weave_inputs[] = {
143     {
144         .name             = "default",
145         .type             = AVMEDIA_TYPE_VIDEO,
146         .filter_frame     = filter_frame,
147     },
148     { NULL }
149 };
150
151 static const AVFilterPad weave_outputs[] = {
152     {
153         .name          = "default",
154         .type          = AVMEDIA_TYPE_VIDEO,
155         .config_props  = config_props_output,
156     },
157     { NULL }
158 };
159
160 AVFilter ff_vf_weave = {
161     .name          = "weave",
162     .description   = NULL_IF_CONFIG_SMALL("Weave input video fields into frames."),
163     .priv_size     = sizeof(WeaveContext),
164     .priv_class    = &weave_class,
165     .uninit        = uninit,
166     .inputs        = weave_inputs,
167     .outputs       = weave_outputs,
168 };
169
170 static av_cold int init(AVFilterContext *ctx)
171 {
172     WeaveContext *s = ctx->priv;
173
174     if (!strcmp(ctx->filter->name, "doubleweave"))
175         s->double_weave = 1;
176
177     return 0;
178 }
179
180 #define doubleweave_options weave_options
181 AVFILTER_DEFINE_CLASS(doubleweave);
182
183 AVFilter ff_vf_doubleweave = {
184     .name          = "doubleweave",
185     .description   = NULL_IF_CONFIG_SMALL("Weave input video fields into double number of frames."),
186     .priv_size     = sizeof(WeaveContext),
187     .priv_class    = &doubleweave_class,
188     .init          = init,
189     .uninit        = uninit,
190     .inputs        = weave_inputs,
191     .outputs       = weave_outputs,
192 };