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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2007 Bobby Bingham |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | /** |
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| 22 | * @file |
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| 23 | * video vertical flip filter |
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| 24 | */ |
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| 25 | |||
| 26 | #include "libavutil/internal.h" |
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| 27 | #include "libavutil/pixdesc.h" |
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| 28 | #include "avfilter.h" |
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| 29 | #include "internal.h" |
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| 30 | #include "video.h" |
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| 31 | |||
| 32 | typedef struct { |
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| 33 | int vsub; ///< vertical chroma subsampling |
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| 34 | } FlipContext; |
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| 35 | |||
| 36 | static int config_input(AVFilterLink *link) |
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| 37 | { |
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| 38 | FlipContext *flip = link->dst->priv; |
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| 39 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format); |
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| 40 | |||
| 41 | flip->vsub = desc->log2_chroma_h; |
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| 42 | |||
| 43 | return 0; |
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| 44 | } |
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| 45 | |||
| 46 | static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h) |
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| 47 | { |
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| 48 | FlipContext *flip = link->dst->priv; |
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| 49 | AVFrame *frame; |
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| 50 | int i; |
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| 51 | |||
| 52 | frame = ff_get_video_buffer(link->dst->outputs[0], w, h); |
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| 53 | if (!frame) |
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| 54 | return NULL; |
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| 55 | |||
| 56 | for (i = 0; i < 4; i ++) { |
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| 57 | int vsub = i == 1 || i == 2 ? flip->vsub : 0; |
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| 58 | int height = FF_CEIL_RSHIFT(h, vsub); |
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| 59 | |||
| 60 | if (frame->data[i]) { |
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| 61 | frame->data[i] += (height - 1) * frame->linesize[i]; |
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| 62 | frame->linesize[i] = -frame->linesize[i]; |
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| 63 | } |
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| 64 | } |
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| 65 | |||
| 66 | return frame; |
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| 67 | } |
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| 68 | |||
| 69 | static int filter_frame(AVFilterLink *link, AVFrame *frame) |
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| 70 | { |
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| 71 | FlipContext *flip = link->dst->priv; |
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| 72 | int i; |
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| 73 | |||
| 74 | for (i = 0; i < 4; i ++) { |
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| 75 | int vsub = i == 1 || i == 2 ? flip->vsub : 0; |
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| 76 | int height = FF_CEIL_RSHIFT(link->h, vsub); |
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| 77 | |||
| 78 | if (frame->data[i]) { |
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| 79 | frame->data[i] += (height - 1) * frame->linesize[i]; |
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| 80 | frame->linesize[i] = -frame->linesize[i]; |
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| 81 | } |
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| 82 | } |
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| 83 | |||
| 84 | return ff_filter_frame(link->dst->outputs[0], frame); |
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| 85 | } |
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| 86 | static const AVFilterPad avfilter_vf_vflip_inputs[] = { |
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| 87 | { |
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| 88 | .name = "default", |
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| 89 | .type = AVMEDIA_TYPE_VIDEO, |
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| 90 | .get_video_buffer = get_video_buffer, |
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| 91 | .filter_frame = filter_frame, |
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| 92 | .config_props = config_input, |
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| 93 | }, |
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| 94 | { NULL } |
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| 95 | }; |
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| 96 | |||
| 97 | static const AVFilterPad avfilter_vf_vflip_outputs[] = { |
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| 98 | { |
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| 99 | .name = "default", |
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| 100 | .type = AVMEDIA_TYPE_VIDEO, |
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| 101 | }, |
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| 102 | { NULL } |
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| 103 | }; |
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| 104 | |||
| 105 | AVFilter avfilter_vf_vflip = { |
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| 106 | .name = "vflip", |
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| 107 | .description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."), |
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| 108 | .priv_size = sizeof(FlipContext), |
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| 109 | .inputs = avfilter_vf_vflip_inputs, |
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| 110 | .outputs = avfilter_vf_vflip_outputs, |
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| 111 | }; |