blob: 3ea5eb67d7f0a308516a9bd1164ccd7b67ef210f
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/pixdesc.h" |
22 | #include "avfilter.h" |
23 | #include "internal.h" |
24 | |
25 | typedef struct { |
26 | int nb_planes; |
27 | AVFrame *second; |
28 | } SeparateFieldsContext; |
29 | |
30 | static int config_props_output(AVFilterLink *outlink) |
31 | { |
32 | AVFilterContext *ctx = outlink->src; |
33 | SeparateFieldsContext *s = ctx->priv; |
34 | AVFilterLink *inlink = ctx->inputs[0]; |
35 | |
36 | s->nb_planes = av_pix_fmt_count_planes(inlink->format); |
37 | |
38 | if (inlink->h & 1) { |
39 | av_log(ctx, AV_LOG_ERROR, "height must be even\n"); |
40 | return AVERROR_INVALIDDATA; |
41 | } |
42 | |
43 | outlink->time_base.num = inlink->time_base.num; |
44 | outlink->time_base.den = inlink->time_base.den * 2; |
45 | outlink->frame_rate.num = inlink->frame_rate.num * 2; |
46 | outlink->frame_rate.den = inlink->frame_rate.den; |
47 | outlink->w = inlink->w; |
48 | outlink->h = inlink->h / 2; |
49 | |
50 | return 0; |
51 | } |
52 | |
53 | static void extract_field(AVFrame *frame, int nb_planes, int type) |
54 | { |
55 | int i; |
56 | |
57 | for (i = 0; i < nb_planes; i++) { |
58 | if (type) |
59 | frame->data[i] = frame->data[i] + frame->linesize[i]; |
60 | frame->linesize[i] *= 2; |
61 | } |
62 | } |
63 | |
64 | static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) |
65 | { |
66 | AVFilterContext *ctx = inlink->dst; |
67 | SeparateFieldsContext *s = ctx->priv; |
68 | AVFilterLink *outlink = ctx->outputs[0]; |
69 | int ret; |
70 | |
71 | inpicref->height = outlink->h; |
72 | inpicref->interlaced_frame = 0; |
73 | |
74 | if (!s->second) { |
75 | goto clone; |
76 | } else { |
77 | AVFrame *second = s->second; |
78 | |
79 | extract_field(second, s->nb_planes, second->top_field_first); |
80 | |
81 | if (second->pts != AV_NOPTS_VALUE && |
82 | inpicref->pts != AV_NOPTS_VALUE) |
83 | second->pts += inpicref->pts; |
84 | else |
85 | second->pts = AV_NOPTS_VALUE; |
86 | |
87 | ret = ff_filter_frame(outlink, second); |
88 | if (ret < 0) |
89 | return ret; |
90 | clone: |
91 | s->second = av_frame_clone(inpicref); |
92 | if (!s->second) |
93 | return AVERROR(ENOMEM); |
94 | } |
95 | |
96 | extract_field(inpicref, s->nb_planes, !inpicref->top_field_first); |
97 | |
98 | if (inpicref->pts != AV_NOPTS_VALUE) |
99 | inpicref->pts *= 2; |
100 | |
101 | return ff_filter_frame(outlink, inpicref); |
102 | } |
103 | |
104 | static int request_frame(AVFilterLink *outlink) |
105 | { |
106 | AVFilterContext *ctx = outlink->src; |
107 | SeparateFieldsContext *s = ctx->priv; |
108 | int ret; |
109 | |
110 | ret = ff_request_frame(ctx->inputs[0]); |
111 | if (ret == AVERROR_EOF && s->second) { |
112 | s->second->pts *= 2; |
113 | extract_field(s->second, s->nb_planes, s->second->top_field_first); |
114 | ret = ff_filter_frame(outlink, s->second); |
115 | s->second = 0; |
116 | } |
117 | |
118 | return ret; |
119 | } |
120 | |
121 | static const AVFilterPad separatefields_inputs[] = { |
122 | { |
123 | .name = "default", |
124 | .type = AVMEDIA_TYPE_VIDEO, |
125 | .filter_frame = filter_frame, |
126 | }, |
127 | { NULL } |
128 | }; |
129 | |
130 | static const AVFilterPad separatefields_outputs[] = { |
131 | { |
132 | .name = "default", |
133 | .type = AVMEDIA_TYPE_VIDEO, |
134 | .config_props = config_props_output, |
135 | .request_frame = request_frame, |
136 | }, |
137 | { NULL } |
138 | }; |
139 | |
140 | AVFilter ff_vf_separatefields = { |
141 | .name = "separatefields", |
142 | .description = NULL_IF_CONFIG_SMALL("Split input video frames into fields."), |
143 | .priv_size = sizeof(SeparateFieldsContext), |
144 | .inputs = separatefields_inputs, |
145 | .outputs = separatefields_outputs, |
146 | }; |
147 |