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vf_showpalette.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 /**
20  * @file
21  * Display frame palette (AV_PIX_FMT_PAL8)
22  */
23 
24 #include "libavutil/avassert.h"
25 #include "libavutil/opt.h"
26 #include "avfilter.h"
27 #include "formats.h"
28 #include "internal.h"
29 #include "video.h"
30 
31 typedef struct {
32  const AVClass *class;
33  int size;
35 
36 #define OFFSET(x) offsetof(ShowPaletteContext, x)
37 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
38 static const AVOption showpalette_options[] = {
39  { "s", "set pixel box size", OFFSET(size), AV_OPT_TYPE_INT, {.i64=30}, 1, 100, FLAGS },
40  { NULL }
41 };
42 
43 AVFILTER_DEFINE_CLASS(showpalette);
44 
46 {
47  static const enum AVPixelFormat in_fmts[] = {AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE};
48  static const enum AVPixelFormat out_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
51  if (!in || !out) {
52  av_freep(&in);
53  av_freep(&out);
54  return AVERROR(ENOMEM);
55  }
56  ff_formats_ref(in, &ctx->inputs[0]->out_formats);
57  ff_formats_ref(out, &ctx->outputs[0]->in_formats);
58  return 0;
59 }
60 
61 static int config_output(AVFilterLink *outlink)
62 {
63  AVFilterContext *ctx = outlink->src;
64  const ShowPaletteContext *s = ctx->priv;
65  outlink->w = outlink->h = 16 * s->size;
66  return 0;
67 }
68 
69 static int disp_palette(AVFrame *out, const AVFrame *in, int size)
70 {
71  int x, y, i, j;
72  uint32_t *dst = (uint32_t *)out->data[0];
73  const int dst_linesize = out->linesize[0] >> 2;
74  const uint32_t *pal = (uint32_t *)in->data[1];
75 
76  for (y = 0; y < 16; y++)
77  for (x = 0; x < 16; x++)
78  for (j = 0; j < size; j++)
79  for (i = 0; i < size; i++)
80  dst[(y*dst_linesize + x) * size + j*dst_linesize + i] = pal[y*16 + x];
81  return 0;
82 }
83 
84 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
85 {
86  int ret;
87  AVFrame *out;
88  AVFilterContext *ctx = inlink->dst;
89  const ShowPaletteContext *s= ctx->priv;
90  AVFilterLink *outlink = ctx->outputs[0];
91 
92  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
93  if (!out) {
94  av_frame_free(&in);
95  return AVERROR(ENOMEM);
96  }
97  av_frame_copy_props(out, in);
98  ret = disp_palette(out, in, s->size);
99  av_frame_free(&in);
100  return ret < 0 ? ret : ff_filter_frame(outlink, out);
101 }
102 
103 static const AVFilterPad showpalette_inputs[] = {
104  {
105  .name = "default",
106  .type = AVMEDIA_TYPE_VIDEO,
107  .filter_frame = filter_frame,
108  },
109  { NULL }
110 };
111 
113  {
114  .name = "default",
115  .type = AVMEDIA_TYPE_VIDEO,
116  .config_props = config_output,
117  },
118  { NULL }
119 };
120 
122  .name = "showpalette",
123  .description = NULL_IF_CONFIG_SMALL("Display frame palette"),
124  .priv_size = sizeof(ShowPaletteContext),
126  .inputs = showpalette_inputs,
127  .outputs = showpalette_outputs,
128  .priv_class = &showpalette_class,
130 };