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https://github.com/FFmpeg/FFmpeg.git
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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
189 lines
6.6 KiB
C
189 lines
6.6 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/mem.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 "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, .unit = "mode" },
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{ "normal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "mode" },
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{ "diff", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "mode" },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(entropy);
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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_GRAY14, AV_PIX_FMT_GRAY16,
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AV_PIX_FMT_NONE
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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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};
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const 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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FILTER_INPUTS(inputs),
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FILTER_OUTPUTS(ff_video_default_filterpad),
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FILTER_PIXFMTS_ARRAY(pixfmts),
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.priv_class = &entropy_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_METADATA_ONLY,
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};
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