libavfilter/vf_pixdesctest.c

   1 /*
   2  * Copyright (c) 2009 Stefano Sabatini
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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  * pixdesc test filter
  24  */
  25
  26 #include "libavutil/common.h"
  27 #include "libavutil/pixdesc.h"
  28 #include "avfilter.h"
  29 #include "internal.h"
  30 #include "video.h"
  31
  32 typedef struct {
  33     const AVPixFmtDescriptor *pix_desc;
  34     uint16_t *line;
  35 } PixdescTestContext;
  36
  37 static av_cold void uninit(AVFilterContext *ctx)
  38 {
  39     PixdescTestContext *priv = ctx->priv;
  40     av_freep(&priv->line);
  41 }
  42
  43 static int config_props(AVFilterLink *inlink)
  44 {
  45     PixdescTestContext *priv = inlink->dst->priv;
  46
  47     priv->pix_desc = av_pix_fmt_desc_get(inlink->format);
  48
  49     if (!(priv->line = av_malloc(sizeof(*priv->line) * inlink->w)))
  50         return AVERROR(ENOMEM);
  51
  52     return 0;
  53 }
  54
  55 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
  56 {
  57     PixdescTestContext *priv = inlink->dst->priv;
  58     AVFilterLink *outlink    = inlink->dst->outputs[0];
  59     AVFilterBufferRef *out;
  60     int i, c, w = inlink->w, h = inlink->h;
  61
  62     out = ff_get_video_buffer(outlink, AV_PERM_WRITE,
  63                               outlink->w, outlink->h);
  64     if (!out) {
  65         avfilter_unref_bufferp(&in);
  66         return AVERROR(ENOMEM);
  67     }
  68
  69     avfilter_copy_buffer_ref_props(out, in);
  70
  71     for (i = 0; i < 4; i++) {
  72         int h = outlink->h;
  73         h = i == 1 || i == 2 ? h>>priv->pix_desc->log2_chroma_h : h;
  74         if (out->data[i]) {
  75             uint8_t *data = out->data[i] +
  76                 (out->linesize[i] > 0 ? 0 : out->linesize[i] * (h-1));
  77             memset(data, 0, FFABS(out->linesize[i]) * h);
  78         }
  79     }
  80
  81     /* copy palette */
  82     if (priv->pix_desc->flags & PIX_FMT_PAL ||
  83         priv->pix_desc->flags & PIX_FMT_PSEUDOPAL)
  84         memcpy(out->data[1], in->data[1], 256*4);
  85
  86     for (c = 0; c < priv->pix_desc->nb_components; c++) {
  87         int w1 = c == 1 || c == 2 ? w>>priv->pix_desc->log2_chroma_w : w;
  88         int h1 = c == 1 || c == 2 ? h>>priv->pix_desc->log2_chroma_h : h;
  89
  90         for (i = 0; i < h1; i++) {
  91             av_read_image_line(priv->line,
  92                                in->data,
  93                                in->linesize,
  94                                priv->pix_desc,
  95                                0, i, c, w1, 0);
  96
  97             av_write_image_line(priv->line,
  98                                 out->data,
  99                                 out->linesize,
 100                                 priv->pix_desc,
 101                                 0, i, c, w1);
 102         }
 103     }
 104
 105     avfilter_unref_bufferp(&in);
 106     return ff_filter_frame(outlink, out);
 107 }
 108
 109 static const AVFilterPad avfilter_vf_pixdesctest_inputs[] = {
 110     {
 111         .name         = "default",
 112         .type         = AVMEDIA_TYPE_VIDEO,
 113         .filter_frame = filter_frame,
 114         .config_props = config_props,
 115         .min_perms    = AV_PERM_READ,
 116     },
 117     { NULL }
 118 };
 119
 120 static const AVFilterPad avfilter_vf_pixdesctest_outputs[] = {
 121     {
 122         .name = "default",
 123         .type = AVMEDIA_TYPE_VIDEO,
 124     },
 125     { NULL }
 126 };
 127
 128 AVFilter avfilter_vf_pixdesctest = {
 129     .name        = "pixdesctest",
 130     .description = NULL_IF_CONFIG_SMALL("Test pixel format definitions."),
 131
 132     .priv_size = sizeof(PixdescTestContext),
 133     .uninit    = uninit,
 134
 135     .inputs    = avfilter_vf_pixdesctest_inputs,
 136
 137     .outputs   = avfilter_vf_pixdesctest_outputs,
 138 };