Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * Copyright (c) 2007 Bobby Bingham | |
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 | /** | |
22 | * @file | |
23 | * video vertical flip filter | |
24 | */ | |
25 | ||
26 | #include "libavutil/internal.h" | |
27 | #include "libavutil/pixdesc.h" | |
28 | #include "avfilter.h" | |
29 | #include "internal.h" | |
30 | #include "video.h" | |
31 | ||
32 | typedef struct FlipContext { | |
33 | int vsub; ///< vertical chroma subsampling | |
34 | } FlipContext; | |
35 | ||
36 | static int config_input(AVFilterLink *link) | |
37 | { | |
38 | FlipContext *flip = link->dst->priv; | |
39 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format); | |
40 | ||
41 | flip->vsub = desc->log2_chroma_h; | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
46 | static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h) | |
47 | { | |
48 | FlipContext *flip = link->dst->priv; | |
49 | AVFrame *frame; | |
50 | int i; | |
51 | ||
52 | frame = ff_get_video_buffer(link->dst->outputs[0], w, h); | |
53 | if (!frame) | |
54 | return NULL; | |
55 | ||
56 | for (i = 0; i < 4; i ++) { | |
57 | int vsub = i == 1 || i == 2 ? flip->vsub : 0; | |
58 | int height = FF_CEIL_RSHIFT(h, vsub); | |
59 | ||
60 | if (frame->data[i]) { | |
61 | frame->data[i] += (height - 1) * frame->linesize[i]; | |
62 | frame->linesize[i] = -frame->linesize[i]; | |
63 | } | |
64 | } | |
65 | ||
66 | return frame; | |
67 | } | |
68 | ||
69 | static int filter_frame(AVFilterLink *link, AVFrame *frame) | |
70 | { | |
71 | FlipContext *flip = link->dst->priv; | |
72 | int i; | |
73 | ||
74 | for (i = 0; i < 4; i ++) { | |
75 | int vsub = i == 1 || i == 2 ? flip->vsub : 0; | |
76 | int height = FF_CEIL_RSHIFT(link->h, vsub); | |
77 | ||
78 | if (frame->data[i]) { | |
79 | frame->data[i] += (height - 1) * frame->linesize[i]; | |
80 | frame->linesize[i] = -frame->linesize[i]; | |
81 | } | |
82 | } | |
83 | ||
84 | return ff_filter_frame(link->dst->outputs[0], frame); | |
85 | } | |
86 | static const AVFilterPad avfilter_vf_vflip_inputs[] = { | |
87 | { | |
88 | .name = "default", | |
89 | .type = AVMEDIA_TYPE_VIDEO, | |
90 | .get_video_buffer = get_video_buffer, | |
91 | .filter_frame = filter_frame, | |
92 | .config_props = config_input, | |
93 | }, | |
94 | { NULL } | |
95 | }; | |
96 | ||
97 | static const AVFilterPad avfilter_vf_vflip_outputs[] = { | |
98 | { | |
99 | .name = "default", | |
100 | .type = AVMEDIA_TYPE_VIDEO, | |
101 | }, | |
102 | { NULL } | |
103 | }; | |
104 | ||
105 | AVFilter ff_vf_vflip = { | |
106 | .name = "vflip", | |
107 | .description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."), | |
108 | .priv_size = sizeof(FlipContext), | |
109 | .inputs = avfilter_vf_vflip_inputs, | |
110 | .outputs = avfilter_vf_vflip_outputs, | |
111 | }; |