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  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 {
  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 avfilter_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. };
  112.