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  1. /*
  2.  * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
  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.  * swap UV filter
  24.  */
  25.  
  26. #include "libavutil/pixdesc.h"
  27. #include "avfilter.h"
  28. #include "formats.h"
  29. #include "internal.h"
  30. #include "video.h"
  31.  
  32. static void do_swap(AVFrame *frame)
  33. {
  34.     FFSWAP(uint8_t*,     frame->data[1],     frame->data[2]);
  35.     FFSWAP(int,          frame->linesize[1], frame->linesize[2]);
  36.     FFSWAP(uint64_t,     frame->error[1],    frame->error[2]);
  37.     FFSWAP(AVBufferRef*, frame->buf[1],      frame->buf[2]);
  38. }
  39.  
  40. static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
  41. {
  42.     AVFrame *picref = ff_default_get_video_buffer(link, w, h);
  43.     do_swap(picref);
  44.     return picref;
  45. }
  46.  
  47. static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
  48. {
  49.     do_swap(inpicref);
  50.     return ff_filter_frame(link->dst->outputs[0], inpicref);
  51. }
  52.  
  53. static int is_planar_yuv(const AVPixFmtDescriptor *desc)
  54. {
  55.     int i;
  56.  
  57.     if (desc->flags & ~(AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_ALPHA) ||
  58.         desc->nb_components < 3 ||
  59.         (desc->comp[1].depth_minus1 != desc->comp[2].depth_minus1))
  60.         return 0;
  61.     for (i = 0; i < desc->nb_components; i++) {
  62.         if (desc->comp[i].offset_plus1 != 1 ||
  63.             desc->comp[i].shift != 0 ||
  64.             desc->comp[i].plane != i)
  65.             return 0;
  66.     }
  67.  
  68.     return 1;
  69. }
  70.  
  71. static int query_formats(AVFilterContext *ctx)
  72. {
  73.     AVFilterFormats *formats = NULL;
  74.     int fmt;
  75.  
  76.     for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
  77.         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
  78.         if (is_planar_yuv(desc))
  79.             ff_add_format(&formats, fmt);
  80.     }
  81.  
  82.     ff_set_common_formats(ctx, formats);
  83.     return 0;
  84. }
  85.  
  86. static const AVFilterPad swapuv_inputs[] = {
  87.     {
  88.         .name             = "default",
  89.         .type             = AVMEDIA_TYPE_VIDEO,
  90.         .get_video_buffer = get_video_buffer,
  91.         .filter_frame     = filter_frame,
  92.     },
  93.     { NULL }
  94. };
  95.  
  96. static const AVFilterPad swapuv_outputs[] = {
  97.     {
  98.         .name = "default",
  99.         .type = AVMEDIA_TYPE_VIDEO,
  100.     },
  101.     { NULL }
  102. };
  103.  
  104. AVFilter avfilter_vf_swapuv = {
  105.     .name          = "swapuv",
  106.     .description   = NULL_IF_CONFIG_SMALL("Swap U and V components."),
  107.     .query_formats = query_formats,
  108.     .inputs        = swapuv_inputs,
  109.     .outputs       = swapuv_outputs,
  110. };
  111.