LCOV - code coverage report
Current view: top level - libavfilter - vf_entropy.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 64 0.0 %
Date: 2018-05-20 11:54:08 Functions: 0 4 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2017 Paul B Mahol
       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             : #include "libavutil/imgutils.h"
      22             : #include "libavutil/opt.h"
      23             : #include "libavutil/pixdesc.h"
      24             : #include "avfilter.h"
      25             : #include "drawutils.h"
      26             : #include "formats.h"
      27             : #include "internal.h"
      28             : #include "video.h"
      29             : 
      30             : typedef struct EntropyContext {
      31             :     const AVClass *class;
      32             : 
      33             :     int mode;
      34             : 
      35             :     int nb_planes;
      36             :     int planeheight[4];
      37             :     int planewidth[4];
      38             :     int depth;
      39             :     int is_rgb;
      40             :     uint8_t rgba_map[4];
      41             :     char planenames[4];
      42             :     int64_t *histogram;
      43             : } EntropyContext;
      44             : 
      45             : #define OFFSET(x) offsetof(EntropyContext, x)
      46             : #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
      47             : static const AVOption entropy_options[] = {
      48             :     { "mode", "set kind of histogram entropy measurement",  OFFSET(mode), AV_OPT_TYPE_INT,   {.i64=0}, 0, 1, FLAGS, "mode" },
      49             :     { "normal", NULL,                                       0,            AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
      50             :     { "diff",   NULL,                                       0,            AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
      51             :     { NULL }
      52             : };
      53             : 
      54             : AVFILTER_DEFINE_CLASS(entropy);
      55             : 
      56           0 : static int query_formats(AVFilterContext *ctx)
      57             : {
      58             :     static const enum AVPixelFormat pixfmts[] = {
      59             :         AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
      60             :         AV_PIX_FMT_YUV440P,
      61             :         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
      62             :         AV_PIX_FMT_YUVJ440P,
      63             :         AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9,
      64             :         AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10,
      65             :         AV_PIX_FMT_YUV440P10,
      66             :         AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
      67             :         AV_PIX_FMT_YUV440P12,
      68             :         AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
      69             :         AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16,
      70             :         AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
      71             :         AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
      72             :         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY16,
      73             :         AV_PIX_FMT_NONE
      74             :     };
      75             : 
      76           0 :     AVFilterFormats *formats = ff_make_format_list(pixfmts);
      77           0 :     if (!formats)
      78           0 :         return AVERROR(ENOMEM);
      79           0 :     return ff_set_common_formats(ctx, formats);
      80             : }
      81             : 
      82           0 : static int config_input(AVFilterLink *inlink)
      83             : {
      84           0 :     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
      85           0 :     AVFilterContext *ctx = inlink->dst;
      86           0 :     EntropyContext *s = ctx->priv;
      87             : 
      88           0 :     s->nb_planes = desc->nb_components;
      89             : 
      90           0 :     s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
      91           0 :     s->planeheight[0] = s->planeheight[3] = inlink->h;
      92           0 :     s->planewidth[1]  = s->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
      93           0 :     s->planewidth[0]  = s->planewidth[3]  = inlink->w;
      94             : 
      95           0 :     s->depth = desc->comp[0].depth;
      96           0 :     s->is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
      97             : 
      98           0 :     s->planenames[0] = s->is_rgb ? 'R' : 'Y';
      99           0 :     s->planenames[1] = s->is_rgb ? 'G' : 'U';
     100           0 :     s->planenames[2] = s->is_rgb ? 'B' : 'V';
     101           0 :     s->planenames[3] = 'A';
     102             : 
     103           0 :     s->histogram = av_malloc_array(1 << s->depth, sizeof(*s->histogram));
     104           0 :     if (!s->histogram)
     105           0 :         return AVERROR(ENOMEM);
     106             : 
     107           0 :     return 0;
     108             : }
     109             : 
     110           0 : static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     111             : {
     112           0 :     AVFilterContext *ctx = inlink->dst;
     113           0 :     AVFilterLink *outlink = ctx->outputs[0];
     114           0 :     EntropyContext *s = ctx->priv;
     115             :     int plane, y, x;
     116             : 
     117           0 :     for (plane = 0; plane < s->nb_planes; plane++) {
     118           0 :         int cidx = s->is_rgb ? s->rgba_map[plane] : plane;
     119           0 :         const uint8_t *src8 = in->data[plane];
     120           0 :         const uint16_t *src16 = (const uint16_t *)in->data[plane];
     121           0 :         float total = s->planewidth[plane] * s->planeheight[plane];
     122           0 :         float entropy = 0;
     123             :         char metabuf[128];
     124             :         char key[128];
     125             : 
     126           0 :         memset(s->histogram, 0, (1 << s->depth) * sizeof(*s->histogram));
     127             : 
     128           0 :         if (s->depth <= 8) {
     129           0 :             for (y = 0; y < s->planeheight[plane]; y++) {
     130           0 :                 for (x = 0; x < s->planewidth[plane]; x++) {
     131           0 :                     s->histogram[src8[x]]++;
     132             :                 }
     133             : 
     134           0 :                 src8 += in->linesize[plane];
     135             :             }
     136             :         } else {
     137           0 :             for (y = 0; y < s->planeheight[plane]; y++) {
     138           0 :                 for (x = 0; x < s->planewidth[plane]; x++) {
     139           0 :                     s->histogram[src16[x]]++;
     140             :                 }
     141             : 
     142           0 :                 src16 += in->linesize[plane] / 2;
     143             :             }
     144             :         }
     145             : 
     146           0 :         for (y = 0; y < 1 << s->depth; y++) {
     147           0 :             if (s->mode == 0) {
     148           0 :                 if (s->histogram[y]) {
     149           0 :                     float p = s->histogram[y] / total;
     150           0 :                     entropy += -log2(p) * p;
     151             :                 }
     152           0 :             } else if (s->mode == 1) {
     153           0 :                 if (y && (s->histogram[y] - s->histogram[y - 1]) != 0) {
     154           0 :                     float p = FFABS(s->histogram[y] - s->histogram[y - 1]) / total;
     155           0 :                     entropy += -log2(p) * p;
     156             :                 }
     157             :             }
     158             :         }
     159             : 
     160           0 :         snprintf(key, sizeof(key), "lavfi.entropy.entropy.%s.%c", s->mode ? "diff" : "normal", s->planenames[cidx]);
     161           0 :         snprintf(metabuf, sizeof(metabuf), "%f", entropy);
     162           0 :         av_dict_set(&in->metadata, key, metabuf, 0);
     163           0 :         snprintf(key, sizeof(key), "lavfi.entropy.normalized_entropy.%s.%c", s->mode ? "diff" : "normal", s->planenames[cidx]);
     164           0 :         snprintf(metabuf, sizeof(metabuf), "%f", entropy / log2(1 << s->depth));
     165           0 :         av_dict_set(&in->metadata, key, metabuf, 0);
     166             :     }
     167             : 
     168           0 :     return ff_filter_frame(outlink, in);
     169             : }
     170             : 
     171           0 : static av_cold void uninit(AVFilterContext *ctx)
     172             : {
     173           0 :     EntropyContext *s = ctx->priv;
     174             : 
     175           0 :     av_freep(&s->histogram);
     176           0 : }
     177             : 
     178             : static const AVFilterPad inputs[] = {
     179             :     {
     180             :         .name           = "default",
     181             :         .type           = AVMEDIA_TYPE_VIDEO,
     182             :         .filter_frame   = filter_frame,
     183             :         .config_props   = config_input,
     184             :     },
     185             :     { NULL }
     186             : };
     187             : 
     188             : static const AVFilterPad outputs[] = {
     189             :     {
     190             :         .name = "default",
     191             :         .type = AVMEDIA_TYPE_VIDEO,
     192             :     },
     193             :     { NULL }
     194             : };
     195             : 
     196             : AVFilter ff_vf_entropy = {
     197             :     .name           = "entropy",
     198             :     .description    = NULL_IF_CONFIG_SMALL("Measure video frames entropy."),
     199             :     .priv_size      = sizeof(EntropyContext),
     200             :     .uninit         = uninit,
     201             :     .query_formats  = query_formats,
     202             :     .inputs         = inputs,
     203             :     .outputs        = outputs,
     204             :     .priv_class     = &entropy_class,
     205             :     .flags          = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
     206             : };

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