mirror of https://github.com/FFmpeg/FFmpeg.git
Based off mpv automatic tonemapping capabilities. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>pull/266/head
Vittorio Giovara
7 years ago
parent
8b9ae9a8e0
commit
62dfa2ba14
5 changed files with 465 additions and 1 deletions
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/*
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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 <string.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/mastering_display_metadata.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 "formats.h" |
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#include "internal.h" |
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#include "video.h" |
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#define REFERENCE_WHITE 100.0f |
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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 LumaCoefficients { |
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double cr, cg, cb; |
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} LumaCoefficients; |
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static const struct LumaCoefficients luma_coefficients[AVCOL_SPC_NB] = { |
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[AVCOL_SPC_FCC] = { 0.30, 0.59, 0.11 }, |
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[AVCOL_SPC_BT470BG] = { 0.299, 0.587, 0.114 }, |
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[AVCOL_SPC_SMPTE170M] = { 0.299, 0.587, 0.114 }, |
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[AVCOL_SPC_BT709] = { 0.2126, 0.7152, 0.0722 }, |
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[AVCOL_SPC_SMPTE240M] = { 0.212, 0.701, 0.087 }, |
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[AVCOL_SPC_BT2020_NCL] = { 0.2627, 0.6780, 0.0593 }, |
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[AVCOL_SPC_BT2020_CL] = { 0.2627, 0.6780, 0.0593 }, |
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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 LumaCoefficients *coeffs; |
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} TonemapContext; |
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static const enum AVPixelFormat pix_fmts[] = { |
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AV_PIX_FMT_GBRPF32, |
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AV_PIX_FMT_GBRAPF32, |
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AV_PIX_FMT_NONE, |
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}; |
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static int query_formats(AVFilterContext *ctx) |
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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 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 double determine_signal_peak(AVFrame *in) |
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{ |
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AVFrameSideData *sd = av_frame_get_side_data(in, AV_FRAME_DATA_CONTENT_LIGHT_LEVEL); |
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double peak = 0; |
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if (sd) { |
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AVContentLightMetadata *clm = (AVContentLightMetadata *)sd->data; |
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peak = clm->MaxCLL / REFERENCE_WHITE; |
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} |
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sd = av_frame_get_side_data(in, AV_FRAME_DATA_MASTERING_DISPLAY_METADATA); |
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if (!peak && sd) { |
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AVMasteringDisplayMetadata *metadata = (AVMasteringDisplayMetadata *)sd->data; |
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if (metadata->has_luminance) |
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peak = av_q2d(metadata->max_luminance) / REFERENCE_WHITE; |
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} |
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/* smpte2084 needs the side data above to work correctly
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* if missing, assume that the original transfer was arib-std-b67 */ |
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if (!peak) |
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peak = 12; |
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return peak; |
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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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const float *r_in = (const float *)(in->data[0] + x * desc->comp[0].step + y * in->linesize[0]); |
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const float *b_in = (const float *)(in->data[1] + x * desc->comp[1].step + y * in->linesize[1]); |
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const float *g_in = (const float *)(in->data[2] + x * desc->comp[2].step + y * in->linesize[2]); |
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float *r_out = (float *)(out->data[0] + x * desc->comp[0].step + y * out->linesize[0]); |
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float *b_out = (float *)(out->data[1] + x * desc->comp[1].step + y * out->linesize[1]); |
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float *g_out = (float *)(out->data[2] + x * desc->comp[2].step + y * out->linesize[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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*b_out = *b_in; |
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*g_out = *g_in; |
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/* desaturate to prevent unnatural colors */ |
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if (s->desat > 0) { |
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float luma = s->coeffs->cr * *r_in + s->coeffs->cg * *g_in + 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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static int filter_frame(AVFilterLink *link, AVFrame *in) |
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{ |
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TonemapContext *s = link->dst->priv; |
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AVFilterLink *outlink = link->dst->outputs[0]; |
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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 = 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 = &luma_coefficients[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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for (y = 0; y < out->height; y++) |
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for (x = 0; x < out->width; x++) |
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tonemap(s, out, in, desc, x, y, peak); |
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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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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, "tonemap" }, |
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{ "none", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_NONE}, 0, 0, FLAGS, "tonemap" }, |
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{ "linear", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_LINEAR}, 0, 0, FLAGS, "tonemap" }, |
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{ "gamma", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_GAMMA}, 0, 0, FLAGS, "tonemap" }, |
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{ "clip", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_CLIP}, 0, 0, FLAGS, "tonemap" }, |
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{ "reinhard", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_REINHARD}, 0, 0, FLAGS, "tonemap" }, |
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{ "hable", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_HABLE}, 0, 0, FLAGS, "tonemap" }, |
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{ "mobius", 0, 0, AV_OPT_TYPE_CONST, {.i64 = TONEMAP_MOBIUS}, 0, 0, FLAGS, "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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static const AVClass tonemap_class = { |
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.class_name = "tonemap", |
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.item_name = av_default_item_name, |
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.option = tonemap_options, |
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.version = LIBAVUTIL_VERSION_INT, |
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.category = AV_CLASS_CATEGORY_FILTER, |
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}; |
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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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{ NULL } |
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}; |
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static const AVFilterPad tonemap_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_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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.query_formats = query_formats, |
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.priv_size = sizeof(TonemapContext), |
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.priv_class = &tonemap_class, |
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.inputs = tonemap_inputs, |
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.outputs = tonemap_outputs, |
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}; |
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