207 lines
7.0 KiB
C
207 lines
7.0 KiB
C
/*
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* Copyright (c) 2017 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "drawutils.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct EntropyContext {
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const AVClass *class;
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int mode;
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int nb_planes;
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int planeheight[4];
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int planewidth[4];
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int depth;
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int is_rgb;
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uint8_t rgba_map[4];
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char planenames[4];
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int64_t *histogram;
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} EntropyContext;
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#define OFFSET(x) offsetof(EntropyContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption entropy_options[] = {
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{ "mode", "set kind of histogram entropy measurement", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "mode" },
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{ "normal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
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{ "diff", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(entropy);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pixfmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
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AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9,
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AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10,
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AV_PIX_FMT_YUV440P10,
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AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
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AV_PIX_FMT_YUV440P12,
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AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
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AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
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AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY16,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *formats = ff_make_format_list(pixfmts);
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if (!formats)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, formats);
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}
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static int config_input(AVFilterLink *inlink)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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AVFilterContext *ctx = inlink->dst;
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EntropyContext *s = ctx->priv;
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s->nb_planes = desc->nb_components;
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s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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s->planeheight[0] = s->planeheight[3] = inlink->h;
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s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
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s->planewidth[0] = s->planewidth[3] = inlink->w;
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s->depth = desc->comp[0].depth;
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s->is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
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s->planenames[0] = s->is_rgb ? 'R' : 'Y';
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s->planenames[1] = s->is_rgb ? 'G' : 'U';
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s->planenames[2] = s->is_rgb ? 'B' : 'V';
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s->planenames[3] = 'A';
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s->histogram = av_malloc_array(1 << s->depth, sizeof(*s->histogram));
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if (!s->histogram)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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EntropyContext *s = ctx->priv;
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int plane, y, x;
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for (plane = 0; plane < s->nb_planes; plane++) {
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int cidx = s->is_rgb ? s->rgba_map[plane] : plane;
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const uint8_t *src8 = in->data[plane];
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const uint16_t *src16 = (const uint16_t *)in->data[plane];
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float total = s->planewidth[plane] * s->planeheight[plane];
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float entropy = 0;
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char metabuf[128];
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char key[128];
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memset(s->histogram, 0, (1 << s->depth) * sizeof(*s->histogram));
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if (s->depth <= 8) {
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for (y = 0; y < s->planeheight[plane]; y++) {
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for (x = 0; x < s->planewidth[plane]; x++) {
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s->histogram[src8[x]]++;
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}
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src8 += in->linesize[plane];
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}
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} else {
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for (y = 0; y < s->planeheight[plane]; y++) {
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for (x = 0; x < s->planewidth[plane]; x++) {
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s->histogram[src16[x]]++;
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}
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src16 += in->linesize[plane] / 2;
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}
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}
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for (y = 0; y < 1 << s->depth; y++) {
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if (s->mode == 0) {
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if (s->histogram[y]) {
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float p = s->histogram[y] / total;
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entropy += -log2(p) * p;
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}
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} else if (s->mode == 1) {
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if (y && (s->histogram[y] - s->histogram[y - 1]) != 0) {
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float p = FFABS(s->histogram[y] - s->histogram[y - 1]) / total;
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entropy += -log2(p) * p;
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}
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}
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}
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snprintf(key, sizeof(key), "lavfi.entropy.entropy.%s.%c", s->mode ? "diff" : "normal", s->planenames[cidx]);
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snprintf(metabuf, sizeof(metabuf), "%f", entropy);
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av_dict_set(&in->metadata, key, metabuf, 0);
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snprintf(key, sizeof(key), "lavfi.entropy.normalized_entropy.%s.%c", s->mode ? "diff" : "normal", s->planenames[cidx]);
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snprintf(metabuf, sizeof(metabuf), "%f", entropy / log2(1 << s->depth));
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av_dict_set(&in->metadata, key, metabuf, 0);
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}
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return ff_filter_frame(outlink, in);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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EntropyContext *s = ctx->priv;
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av_freep(&s->histogram);
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}
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static const AVFilterPad inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_input,
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},
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{ NULL }
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_entropy = {
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.name = "entropy",
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.description = NULL_IF_CONFIG_SMALL("Measure video frames entropy."),
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.priv_size = sizeof(EntropyContext),
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = inputs,
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.outputs = outputs,
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.priv_class = &entropy_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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