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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;
  34. } ShowPaletteContext;
  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.  
  45. static int query_formats(AVFilterContext *ctx)
  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};
  49.     AVFilterFormats *in  = ff_make_format_list(in_fmts);
  50.     AVFilterFormats *out = ff_make_format_list(out_fmts);
  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.  
  112. static const AVFilterPad showpalette_outputs[] = {
  113.     {
  114.         .name         = "default",
  115.         .type         = AVMEDIA_TYPE_VIDEO,
  116.         .config_props = config_output,
  117.     },
  118.     { NULL }
  119. };
  120.  
  121. AVFilter ff_vf_showpalette = {
  122.     .name          = "showpalette",
  123.     .description   = NULL_IF_CONFIG_SMALL("Display frame palette"),
  124.     .priv_size     = sizeof(ShowPaletteContext),
  125.     .query_formats = query_formats,
  126.     .inputs        = showpalette_inputs,
  127.     .outputs       = showpalette_outputs,
  128.     .priv_class    = &showpalette_class,
  129.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
  130. };
  131.