319 lines
11 KiB
C
319 lines
11 KiB
C
/*
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* Copyright (c) 2017 Vittorio Giovara <vittorio.giovara@gmail.com>
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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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/**
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* @file
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* tonemap algorithms
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*/
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#include <float.h>
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#include <stdio.h>
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#include "libavutil/csp.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.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 "colorspace.h"
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#include "internal.h"
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#include "video.h"
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enum TonemapAlgorithm {
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TONEMAP_NONE,
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TONEMAP_LINEAR,
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TONEMAP_GAMMA,
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TONEMAP_CLIP,
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TONEMAP_REINHARD,
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TONEMAP_HABLE,
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TONEMAP_MOBIUS,
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TONEMAP_MAX,
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};
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typedef struct TonemapContext {
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const AVClass *class;
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enum TonemapAlgorithm tonemap;
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double param;
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double desat;
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double peak;
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const AVLumaCoefficients *coeffs;
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} TonemapContext;
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static av_cold int init(AVFilterContext *ctx)
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{
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TonemapContext *s = ctx->priv;
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switch(s->tonemap) {
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case TONEMAP_GAMMA:
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if (isnan(s->param))
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s->param = 1.8f;
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break;
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case TONEMAP_REINHARD:
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if (!isnan(s->param))
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s->param = (1.0f - s->param) / s->param;
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break;
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case TONEMAP_MOBIUS:
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if (isnan(s->param))
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s->param = 0.3f;
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break;
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}
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if (isnan(s->param))
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s->param = 1.0f;
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return 0;
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}
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static float hable(float in)
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{
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float a = 0.15f, b = 0.50f, c = 0.10f, d = 0.20f, e = 0.02f, f = 0.30f;
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return (in * (in * a + b * c) + d * e) / (in * (in * a + b) + d * f) - e / f;
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}
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static float mobius(float in, float j, double peak)
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{
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float a, b;
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if (in <= j)
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return in;
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a = -j * j * (peak - 1.0f) / (j * j - 2.0f * j + peak);
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b = (j * j - 2.0f * j * peak + peak) / FFMAX(peak - 1.0f, 1e-6);
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return (b * b + 2.0f * b * j + j * j) / (b - a) * (in + a) / (in + b);
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}
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#define MIX(x,y,a) (x) * (1 - (a)) + (y) * (a)
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static void tonemap(TonemapContext *s, AVFrame *out, const AVFrame *in,
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const AVPixFmtDescriptor *desc, int x, int y, double peak)
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{
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int map[3] = { desc->comp[0].plane, desc->comp[1].plane, desc->comp[2].plane };
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const float *r_in = (const float *)(in->data[map[0]] + x * desc->comp[map[0]].step + y * in->linesize[map[0]]);
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const float *g_in = (const float *)(in->data[map[1]] + x * desc->comp[map[1]].step + y * in->linesize[map[1]]);
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const float *b_in = (const float *)(in->data[map[2]] + x * desc->comp[map[2]].step + y * in->linesize[map[2]]);
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float *r_out = (float *)(out->data[map[0]] + x * desc->comp[map[0]].step + y * out->linesize[map[0]]);
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float *g_out = (float *)(out->data[map[1]] + x * desc->comp[map[1]].step + y * out->linesize[map[1]]);
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float *b_out = (float *)(out->data[map[2]] + x * desc->comp[map[2]].step + y * out->linesize[map[2]]);
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float sig, sig_orig;
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/* load values */
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*r_out = *r_in;
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*g_out = *g_in;
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*b_out = *b_in;
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/* desaturate to prevent unnatural colors */
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if (s->desat > 0) {
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float luma = av_q2d(s->coeffs->cr) * *r_in + av_q2d(s->coeffs->cg) * *g_in + av_q2d(s->coeffs->cb) * *b_in;
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float overbright = FFMAX(luma - s->desat, 1e-6) / FFMAX(luma, 1e-6);
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*r_out = MIX(*r_in, luma, overbright);
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*g_out = MIX(*g_in, luma, overbright);
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*b_out = MIX(*b_in, luma, overbright);
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}
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/* pick the brightest component, reducing the value range as necessary
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* to keep the entire signal in range and preventing discoloration due to
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* out-of-bounds clipping */
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sig = FFMAX(FFMAX3(*r_out, *g_out, *b_out), 1e-6);
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sig_orig = sig;
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switch(s->tonemap) {
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default:
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case TONEMAP_NONE:
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// do nothing
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break;
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case TONEMAP_LINEAR:
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sig = sig * s->param / peak;
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break;
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case TONEMAP_GAMMA:
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sig = sig > 0.05f ? pow(sig / peak, 1.0f / s->param)
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: sig * pow(0.05f / peak, 1.0f / s->param) / 0.05f;
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break;
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case TONEMAP_CLIP:
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sig = av_clipf(sig * s->param, 0, 1.0f);
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break;
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case TONEMAP_HABLE:
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sig = hable(sig) / hable(peak);
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break;
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case TONEMAP_REINHARD:
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sig = sig / (sig + s->param) * (peak + s->param) / peak;
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break;
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case TONEMAP_MOBIUS:
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sig = mobius(sig, s->param, peak);
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break;
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}
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/* apply the computed scale factor to the color,
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* linearly to prevent discoloration */
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*r_out *= sig / sig_orig;
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*g_out *= sig / sig_orig;
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*b_out *= sig / sig_orig;
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}
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typedef struct ThreadData {
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AVFrame *in, *out;
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const AVPixFmtDescriptor *desc;
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double peak;
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} ThreadData;
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static int tonemap_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
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{
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TonemapContext *s = ctx->priv;
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ThreadData *td = arg;
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AVFrame *in = td->in;
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AVFrame *out = td->out;
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const AVPixFmtDescriptor *desc = td->desc;
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const int slice_start = (in->height * jobnr) / nb_jobs;
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const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
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double peak = td->peak;
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for (int y = slice_start; y < slice_end; y++)
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for (int x = 0; x < out->width; x++)
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tonemap(s, out, in, desc, x, y, peak);
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return 0;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *in)
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{
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AVFilterContext *ctx = link->dst;
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TonemapContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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ThreadData td;
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AVFrame *out;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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const AVPixFmtDescriptor *odesc = av_pix_fmt_desc_get(outlink->format);
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int ret, x, y;
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double peak = s->peak;
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if (!desc || !odesc) {
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av_frame_free(&in);
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return AVERROR_BUG;
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}
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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ret = av_frame_copy_props(out, in);
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if (ret < 0) {
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av_frame_free(&in);
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av_frame_free(&out);
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return ret;
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}
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/* input and output transfer will be linear */
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if (in->color_trc == AVCOL_TRC_UNSPECIFIED) {
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av_log(s, AV_LOG_WARNING, "Untagged transfer, assuming linear light\n");
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out->color_trc = AVCOL_TRC_LINEAR;
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} else if (in->color_trc != AVCOL_TRC_LINEAR)
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av_log(s, AV_LOG_WARNING, "Tonemapping works on linear light only\n");
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/* read peak from side data if not passed in */
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if (!peak) {
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peak = ff_determine_signal_peak(in);
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av_log(s, AV_LOG_DEBUG, "Computed signal peak: %f\n", peak);
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}
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/* load original color space even if pixel format is RGB to compute overbrights */
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s->coeffs = av_csp_luma_coeffs_from_avcsp(in->colorspace);
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if (s->desat > 0 && (in->colorspace == AVCOL_SPC_UNSPECIFIED || !s->coeffs)) {
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if (in->colorspace == AVCOL_SPC_UNSPECIFIED)
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av_log(s, AV_LOG_WARNING, "Missing color space information, ");
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else if (!s->coeffs)
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av_log(s, AV_LOG_WARNING, "Unsupported color space '%s', ",
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av_color_space_name(in->colorspace));
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av_log(s, AV_LOG_WARNING, "desaturation is disabled\n");
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s->desat = 0;
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}
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/* do the tone map */
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td.out = out;
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td.in = in;
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td.desc = desc;
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td.peak = peak;
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ff_filter_execute(ctx, tonemap_slice, &td, NULL,
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FFMIN(in->height, ff_filter_get_nb_threads(ctx)));
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/* copy/generate alpha if needed */
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if (desc->flags & AV_PIX_FMT_FLAG_ALPHA && odesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
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av_image_copy_plane(out->data[3], out->linesize[3],
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in->data[3], in->linesize[3],
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out->linesize[3], outlink->h);
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} else if (odesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
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for (y = 0; y < out->height; y++) {
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for (x = 0; x < out->width; x++) {
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AV_WN32(out->data[3] + x * odesc->comp[3].step + y * out->linesize[3],
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av_float2int(1.0f));
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}
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}
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}
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av_frame_free(&in);
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ff_update_hdr_metadata(out, peak);
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return ff_filter_frame(outlink, out);
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}
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#define OFFSET(x) offsetof(TonemapContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption tonemap_options[] = {
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{ "tonemap", "tonemap algorithm selection", OFFSET(tonemap), AV_OPT_TYPE_INT, {.i64 = TONEMAP_NONE}, TONEMAP_NONE, TONEMAP_MAX - 1, FLAGS, .unit = "tonemap" },
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{ "none", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_NONE}, 0, 0, FLAGS, .unit = "tonemap" },
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{ "linear", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_LINEAR}, 0, 0, FLAGS, .unit = "tonemap" },
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{ "gamma", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_GAMMA}, 0, 0, FLAGS, .unit = "tonemap" },
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{ "clip", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_CLIP}, 0, 0, FLAGS, .unit = "tonemap" },
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{ "reinhard", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_REINHARD}, 0, 0, FLAGS, .unit = "tonemap" },
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{ "hable", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_HABLE}, 0, 0, FLAGS, .unit = "tonemap" },
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{ "mobius", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_MOBIUS}, 0, 0, FLAGS, .unit = "tonemap" },
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{ "param", "tonemap parameter", OFFSET(param), AV_OPT_TYPE_DOUBLE, {.dbl = NAN}, DBL_MIN, DBL_MAX, FLAGS },
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{ "desat", "desaturation strength", OFFSET(desat), AV_OPT_TYPE_DOUBLE, {.dbl = 2}, 0, DBL_MAX, FLAGS },
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{ "peak", "signal peak override", OFFSET(peak), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, DBL_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(tonemap);
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static const AVFilterPad tonemap_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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},
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};
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const AVFilter ff_vf_tonemap = {
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.name = "tonemap",
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.description = NULL_IF_CONFIG_SMALL("Conversion to/from different dynamic ranges."),
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.init = init,
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.priv_size = sizeof(TonemapContext),
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.priv_class = &tonemap_class,
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FILTER_INPUTS(tonemap_inputs),
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FILTER_OUTPUTS(ff_video_default_filterpad),
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FILTER_PIXFMTS(AV_PIX_FMT_GBRPF32, AV_PIX_FMT_GBRAPF32),
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.flags = AVFILTER_FLAG_SLICE_THREADS,
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};
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