441 lines
14 KiB
C
441 lines
14 KiB
C
/*
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* Copyright (c) 2020 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/pixdesc.h"
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#include "libavutil/opt.h"
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#include "avfilter.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 TMidEqualizerContext {
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const AVClass *class;
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int planes;
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int radius;
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float sigma;
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int plane_width[4], plane_height[4];
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int nb_frames;
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int depth;
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int f_frames;
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int l_frames;
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int del_frame;
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int cur_frame;
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int nb_planes;
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int histogram_size;
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float kernel[127];
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float *histogram[4][256];
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float *change[4];
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AVFrame **frames;
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void (*compute_histogram)(const uint8_t *ssrc, ptrdiff_t linesize,
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int w, int h, float *histogram, size_t hsize);
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void (*apply_contrast_change)(const uint8_t *src, ptrdiff_t src_linesize,
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uint8_t *dst, ptrdiff_t dst_linesize,
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int w, int h, float *change, float *orig);
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} TMidEqualizerContext;
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#define OFFSET(x) offsetof(TMidEqualizerContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption tmidequalizer_options[] = {
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{ "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=5}, 1, 127, FLAGS },
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{ "sigma", "set sigma", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS },
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{ "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(tmidequalizer);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
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AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
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AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
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AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12,
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AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
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AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14,
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AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
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AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
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AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
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AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12,
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AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
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AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
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AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16,
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AV_PIX_FMT_GRAY16,
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AV_PIX_FMT_NONE
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};
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return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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}
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static void compute_contrast_function(const float *const histograms[256],
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const float *const kernel,
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int nb_frames, int radius, int hsize,
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float *f, int idx)
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{
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const float *const h1 = histograms[idx];
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int p2[256] = { 0 };
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for (int p1 = 0; p1 < hsize; p1++) {
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float weight = 1.f;
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float sum = p1 * weight;
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for (int j = 0; j < radius; j++) {
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const int nidx = ((idx - radius + j) % nb_frames);
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const float *const h2 = histograms[nidx < 0 ? nidx + nb_frames: nidx];
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int k = j;
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for (; p2[k] < hsize && h2[p2[k]] < h1[p1]; p2[k]++);
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if (p2[k] == hsize)
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p2[k]--;
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weight += kernel[j];
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sum += kernel[j] * p2[k];
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}
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for (int j = radius + 1; j < nb_frames; j++) {
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const int nidx = (idx - radius + j) % nb_frames;
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const float *const h2 = histograms[nidx < 0 ? nidx + nb_frames: nidx];
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int k = j;
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for (; p2[k] < hsize && h2[p2[k]] < h1[p1]; p2[k]++);
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if (p2[k] == hsize)
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p2[k]--;
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weight += kernel[j - radius - 1];
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sum += kernel[j - radius - 1] * p2[k];
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}
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f[p1] = sum / weight;
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}
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}
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static void apply_contrast_change8(const uint8_t *src, ptrdiff_t src_linesize,
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uint8_t *dst, ptrdiff_t dst_linesize,
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int w, int h, float *change, float *orig)
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{
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for (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++)
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dst[x] = lrintf(change[src[x]]);
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dst += dst_linesize;
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src += src_linesize;
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}
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}
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static void apply_contrast_change16(const uint8_t *ssrc, ptrdiff_t src_linesize,
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uint8_t *ddst, ptrdiff_t dst_linesize,
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int w, int h, float *change, float *orig)
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{
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const uint16_t *src = (const uint16_t *)ssrc;
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uint16_t *dst = (uint16_t *)ddst;
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for (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++)
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dst[x] = lrintf(change[src[x]]);
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dst += dst_linesize / 2;
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src += src_linesize / 2;
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}
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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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TMidEqualizerContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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AVFrame *out;
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int eof = 0;
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if (!in) {
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int idx = s->f_frames < s->nb_frames ? s->radius : s->del_frame ? s->del_frame - 1 : s->nb_frames - 1;
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if (s->f_frames < s->nb_frames) {
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s->l_frames = s->nb_frames - s->f_frames;
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} else {
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s->l_frames++;
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}
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in = av_frame_clone(s->frames[idx]);
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if (!in)
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return AVERROR(ENOMEM);
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eof = 1;
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}
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if (s->f_frames < s->nb_frames) {
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s->frames[s->f_frames] = in;
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for (int p = 0; p < s->nb_planes; p++) {
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s->compute_histogram(in->data[p], in->linesize[p],
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s->plane_width[p], s->plane_height[p],
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s->histogram[p][s->f_frames],
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s->histogram_size);
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}
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s->f_frames++;
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while (s->f_frames <= s->radius) {
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s->frames[s->f_frames] = av_frame_clone(in);
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if (!s->frames[s->f_frames])
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return AVERROR(ENOMEM);
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for (int p = 0; p < s->nb_planes; p++) {
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memcpy(s->histogram[p][s->f_frames],
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s->histogram[p][s->f_frames - 1],
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s->histogram_size * sizeof(float));
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}
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s->f_frames++;
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}
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if (!eof && s->f_frames < s->nb_frames) {
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return 0;
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} else {
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while (s->f_frames < s->nb_frames) {
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s->frames[s->f_frames] = av_frame_clone(in);
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if (!s->frames[s->f_frames])
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return AVERROR(ENOMEM);
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for (int p = 0; p < s->nb_planes; p++) {
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memcpy(s->histogram[p][s->f_frames],
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s->histogram[p][s->f_frames - 1],
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s->histogram_size * sizeof(float));
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}
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s->f_frames++;
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}
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}
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s->cur_frame = s->radius;
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s->del_frame = 0;
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} else {
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av_frame_free(&s->frames[s->del_frame]);
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s->frames[s->del_frame] = in;
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for (int p = 0; p < s->nb_planes; p++) {
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s->compute_histogram(in->data[p], in->linesize[p],
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s->plane_width[p], s->plane_height[p],
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s->histogram[p][s->del_frame],
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s->histogram_size);
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}
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s->del_frame++;
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if (s->del_frame >= s->nb_frames)
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s->del_frame = 0;
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}
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if (ctx->is_disabled) {
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const int idx = s->cur_frame;
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out = av_frame_clone(s->frames[idx]);
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if (!out)
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return AVERROR(ENOMEM);
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} else {
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const int idx = s->cur_frame;
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in = s->frames[idx];
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out)
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return AVERROR(ENOMEM);
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av_frame_copy_props(out, in);
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for (int p = 0; p < s->nb_planes; p++) {
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if (!((1 << p) & s->planes)) {
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av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p],
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s->plane_width[p] * (1 + (s->depth > 8)), s->plane_height[p]);
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continue;
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}
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compute_contrast_function((const float *const *)s->histogram[p], s->kernel,
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s->nb_frames, s->radius, s->histogram_size, s->change[p], idx);
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s->apply_contrast_change(in->data[p], in->linesize[p],
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out->data[p], out->linesize[p],
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s->plane_width[p], s->plane_height[p],
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s->change[p], s->histogram[p][idx]);
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}
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}
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s->cur_frame++;
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if (s->cur_frame >= s->nb_frames)
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s->cur_frame = 0;
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return ff_filter_frame(outlink, out);
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}
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static void compute_histogram8(const uint8_t *src, ptrdiff_t linesize,
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int w, int h, float *histogram, size_t hsize)
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{
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memset(histogram, 0, hsize * sizeof(*histogram));
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for (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++)
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histogram[src[x]] += 1;
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src += linesize;
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}
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for (int x = 0; x < hsize; x++)
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histogram[x] /= hsize;
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for (int x = 1; x < hsize; x++)
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histogram[x] += histogram[x-1];
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}
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static void compute_histogram16(const uint8_t *ssrc, ptrdiff_t linesize,
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int w, int h, float *histogram, size_t hsize)
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{
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const uint16_t *src = (const uint16_t *)ssrc;
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memset(histogram, 0, hsize * sizeof(*histogram));
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for (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++)
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histogram[src[x]] += 1;
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src += linesize / 2;
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}
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for (int x = 0; x < hsize; x++)
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histogram[x] /= hsize;
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for (int x = 1; x < hsize; x++)
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histogram[x] += histogram[x-1];
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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TMidEqualizerContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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float sigma = s->radius * s->sigma;
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int vsub, hsub;
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s->depth = desc->comp[0].depth;
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s->nb_frames = s->radius * 2 + 1;
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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hsub = desc->log2_chroma_w;
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vsub = desc->log2_chroma_h;
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s->plane_height[0] = s->plane_height[3] = inlink->h;
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s->plane_width[0] = s->plane_width[3] = inlink->w;
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s->plane_height[1] = s->plane_height[2] = AV_CEIL_RSHIFT(inlink->h, vsub);
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s->plane_width[1] = s->plane_width[2] = AV_CEIL_RSHIFT(inlink->w, hsub);
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s->histogram_size = 1 << s->depth;
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for (int n = 0; n < s->radius; n++)
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s->kernel[n] = expf(-0.5 * (n + 1) * (n + 1) / (sigma * sigma));
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for (int p = 0; p < s->nb_planes; p++) {
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for (int n = 0; n < s->nb_frames; n++) {
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s->histogram[p][n] = av_calloc(s->histogram_size, sizeof(float));
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if (!s->histogram[p][n])
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return AVERROR(ENOMEM);
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}
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s->change[p] = av_calloc(s->histogram_size, sizeof(float));
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if (!s->change[p])
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return AVERROR(ENOMEM);
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}
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if (!s->frames)
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s->frames = av_calloc(s->nb_frames, sizeof(*s->frames));
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if (!s->frames)
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return AVERROR(ENOMEM);
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s->compute_histogram = s->depth <= 8 ? compute_histogram8 : compute_histogram16;
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s->apply_contrast_change = s->depth <= 8 ? apply_contrast_change8 : apply_contrast_change16;
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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TMidEqualizerContext *s = ctx->priv;
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int ret;
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ret = ff_request_frame(ctx->inputs[0]);
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if (ret == AVERROR_EOF && s->l_frames < s->radius) {
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ret = filter_frame(ctx->inputs[0], NULL);
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}
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return ret;
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}
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static void free_histograms(AVFilterContext *ctx, int x, int nb_frames)
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{
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TMidEqualizerContext *s = ctx->priv;
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for (int n = 0; n < nb_frames; n++)
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av_freep(&s->histogram[x][n]);
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av_freep(&s->change[x]);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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TMidEqualizerContext *s = ctx->priv;
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free_histograms(ctx, 0, s->nb_frames);
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free_histograms(ctx, 1, s->nb_frames);
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free_histograms(ctx, 2, s->nb_frames);
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free_histograms(ctx, 3, s->nb_frames);
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for (int i = 0; i < s->nb_frames && s->frames; i++)
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av_frame_free(&s->frames[i]);
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av_freep(&s->frames);
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}
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static const AVFilterPad tmidequalizer_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad tmidequalizer_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter ff_vf_tmidequalizer = {
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.name = "tmidequalizer",
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.description = NULL_IF_CONFIG_SMALL("Apply Temporal Midway Equalization."),
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.priv_size = sizeof(TMidEqualizerContext),
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = tmidequalizer_inputs,
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.outputs = tmidequalizer_outputs,
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.priv_class = &tmidequalizer_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
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};
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