Paul B Mahol
7 years ago
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631fa0432b
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09b24a807a
6 changed files with 224 additions and 1 deletions
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/*
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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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