/*

  * Copyright (c) 2009 Stefano Sabatini
  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * pixdesc test filter
  */
 
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
 
 typedef struct {
     const AVPixFmtDescriptor *pix_desc;
     uint16_t *line;
 } PixdescTestContext;
 
 static av_cold void uninit(AVFilterContext *ctx)
 {
     PixdescTestContext *priv = ctx->priv;
     av_freep(&priv->line);
 }
 
 static int config_props(AVFilterLink *inlink)
 {
     PixdescTestContext *priv = inlink->dst->priv;
 
     priv->pix_desc = &av_pix_fmt_descriptors[inlink->format];
 
     if (!(priv->line = av_malloc(sizeof(*priv->line) * inlink->w)))
         return AVERROR(ENOMEM);
 
     return 0;
 }
 

 static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)

 {
     PixdescTestContext *priv = inlink->dst->priv;
     AVFilterLink *outlink    = inlink->dst->outputs[0];

     AVFilterBufferRef *outpicref;

     int i;
 

     outlink->out_buf = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,

                                                 outlink->w, outlink->h);

     outpicref = outlink->out_buf;

     avfilter_copy_buffer_ref_props(outpicref, picref);

 
     for (i = 0; i < 4; i++) {
         int h = outlink->h;
         h = i == 1 || i == 2 ? h>>priv->pix_desc->log2_chroma_h : h;
         if (outpicref->data[i]) {
             uint8_t *data = outpicref->data[i] +
                 (outpicref->linesize[i] > 0 ? 0 : outpicref->linesize[i] * (h-1));
             memset(data, 0, FFABS(outpicref->linesize[i]) * h);
         }
     }
 
     /* copy palette */
     if (priv->pix_desc->flags & PIX_FMT_PAL)
         memcpy(outpicref->data[1], outpicref->data[1], 256*4);
 

     avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));

 }
 
 static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     PixdescTestContext *priv = inlink->dst->priv;

     AVFilterBufferRef *inpic    = inlink->cur_buf;
     AVFilterBufferRef *outpic   = inlink->dst->outputs[0]->out_buf;

     int i, c, w = inlink->w;
 
     for (c = 0; c < priv->pix_desc->nb_components; c++) {
         int w1 = c == 1 || c == 2 ? w>>priv->pix_desc->log2_chroma_w : w;
         int h1 = c == 1 || c == 2 ? h>>priv->pix_desc->log2_chroma_h : h;
         int y1 = c == 1 || c == 2 ? y>>priv->pix_desc->log2_chroma_h : y;
 
         for (i = y1; i < y1 + h1; i++) {

             av_read_image_line(priv->line,

                                inpic->data,
                                inpic->linesize,
                                priv->pix_desc,
                                0, i, c, w1, 0);

             av_write_image_line(priv->line,

                                 outpic->data,
                                 outpic->linesize,
                                 priv->pix_desc,
                                 0, i, c, w1);

         }
     }
 
     avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
 }
 
 AVFilter avfilter_vf_pixdesctest = {
     .name        = "pixdesctest",

     .description = NULL_IF_CONFIG_SMALL("Test pixel format definitions."),

 
     .priv_size = sizeof(PixdescTestContext),
     .uninit    = uninit,
 
     .inputs    = (AVFilterPad[]) {{ .name            = "default",
                                     .type            = AVMEDIA_TYPE_VIDEO,
                                     .start_frame     = start_frame,
                                     .draw_slice      = draw_slice,
                                     .config_props    = config_props,
                                     .min_perms       = AV_PERM_READ, },
                                   { .name = NULL}},
 
     .outputs   = (AVFilterPad[]) {{ .name            = "default",
                                     .type            = AVMEDIA_TYPE_VIDEO, },
                                   { .name = NULL}},
 };