libavfilter/vf_swapuv.c

   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 "filters.h"
  29 #include "formats.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(AVBufferRef*, frame->buf[1],      frame->buf[2]);
  37 }
  38
  39 static AVFrame *get_video_buffer(AVFilterLink *link, int w, int h)
  40 {
  41     AVFrame *picref = ff_default_get_video_buffer(link, w, h);
  42     do_swap(picref);
  43     return picref;
  44 }
  45
  46 static int filter_frame(AVFilterLink *link, AVFrame *inpicref)
  47 {
  48     do_swap(inpicref);
  49     return ff_filter_frame(link->dst->outputs[0], inpicref);
  50 }
  51
  52 static int is_planar_yuv(const AVPixFmtDescriptor *desc)
  53 {
  54     int i;
  55
  56     if (desc->flags & ~(AV_PIX_FMT_FLAG_BE | AV_PIX_FMT_FLAG_PLANAR | AV_PIX_FMT_FLAG_ALPHA) ||
  57         desc->nb_components < 3 ||
  58         (desc->comp[1].depth != desc->comp[2].depth))
  59         return 0;
  60     for (i = 0; i < desc->nb_components; i++) {
  61         if (desc->comp[i].offset != 0 ||
  62             desc->comp[i].shift != 0 ||
  63             desc->comp[i].plane != i)
  64             return 0;
  65     }
  66
  67     return 1;
  68 }
  69
  70 static int query_formats(const AVFilterContext *ctx,
  71                          AVFilterFormatsConfig **cfg_in,
  72                          AVFilterFormatsConfig **cfg_out)
  73 {
  74     AVFilterFormats *formats = NULL;
  75     int fmt, ret;
  76
  77     for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
  78         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
  79         if (is_planar_yuv(desc) && (ret = ff_add_format(&formats, fmt)) < 0)
  80             return ret;
  81     }
  82
  83     return ff_set_common_formats2(ctx, cfg_in, cfg_out, formats);
  84 }
  85
  86 static const AVFilterPad swapuv_inputs[] = {
  87     {
  88         .name             = "default",
  89         .type             = AVMEDIA_TYPE_VIDEO,
  90         .get_buffer.video = get_video_buffer,
  91         .filter_frame     = filter_frame,
  92     },
  93 };
  94
  95 const FFFilter ff_vf_swapuv = {
  96     .p.name        = "swapuv",
  97     .p.description = NULL_IF_CONFIG_SMALL("Swap U and V components."),
  98     .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
  99     FILTER_INPUTS(swapuv_inputs),
 100     FILTER_OUTPUTS(ff_video_default_filterpad),
 101     FILTER_QUERY_FUNC2(query_formats),
 102 };