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2cb0cebd11
This filter is designed to parse embedded ICC profiles and attempt extracting colorspace tags from them, updating the AVFrame metadata accordingly. This is intentionally made a separate filter, rather than being part of libavcodec itself, so that it's an opt-in behavior for the time being. This also gives the user more flexibility to e.g. first attach an ICC profile and then also set the colorspace tags from it. This makes #9673 possible, though not automatic. Signed-off-by: Niklas Haas <git@haasn.dev>
143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/*
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* Copyright (c) 2022 Niklas Haas
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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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* filter for generating ICC profiles
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*/
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#include <lcms2.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 "fflcms2.h"
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#include "internal.h"
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typedef struct IccDetectContext {
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const AVClass *class;
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FFIccContext icc;
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int force;
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/* (cached) detected ICC profile values */
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AVBufferRef *profile;
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enum AVColorPrimaries profile_prim;
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enum AVColorTransferCharacteristic profile_trc;
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} IccDetectContext;
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#define OFFSET(x) offsetof(IccDetectContext, x)
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#define VF AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption iccdetect_options[] = {
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{ "force", "overwrite existing tags", OFFSET(force), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, VF },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(iccdetect);
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static av_cold void iccdetect_uninit(AVFilterContext *avctx)
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{
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IccDetectContext *s = avctx->priv;
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av_buffer_unref(&s->profile);
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ff_icc_context_uninit(&s->icc);
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}
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static av_cold int iccdetect_init(AVFilterContext *avctx)
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{
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IccDetectContext *s = avctx->priv;
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return ff_icc_context_init(&s->icc, avctx);
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}
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static int iccdetect_filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *avctx = inlink->dst;
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IccDetectContext *s = avctx->priv;
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const AVFrameSideData *sd;
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struct ColorPrimaries coeffs;
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cmsHPROFILE profile;
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int ret;
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sd = av_frame_get_side_data(frame, AV_FRAME_DATA_ICC_PROFILE);
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if (!sd)
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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if (s->profile && s->profile->data == sd->buf->data) {
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/* No change from previous ICC profile */
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goto done;
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}
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if ((ret = av_buffer_replace(&s->profile, sd->buf)) < 0)
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return ret;
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s->profile_prim = AVCOL_PRI_UNSPECIFIED;
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s->profile_trc = AVCOL_TRC_UNSPECIFIED;
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profile = cmsOpenProfileFromMemTHR(s->icc.ctx, sd->data, sd->size);
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if (!profile)
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return AVERROR_INVALIDDATA;
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ret = ff_icc_profile_read_primaries(&s->icc, profile, &coeffs);
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if (!ret)
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ret = ff_icc_profile_detect_transfer(&s->icc, profile, &s->profile_trc);
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cmsCloseProfile(profile);
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if (ret < 0)
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return ret;
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s->profile_prim = ff_detect_color_primaries(&coeffs);
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done:
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if (s->profile_prim != AVCOL_PRI_UNSPECIFIED) {
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if (s->force || frame->color_primaries == AVCOL_PRI_UNSPECIFIED)
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frame->color_primaries = s->profile_prim;
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}
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if (s->profile_trc != AVCOL_TRC_UNSPECIFIED) {
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if (s->force || frame->color_trc == AVCOL_TRC_UNSPECIFIED)
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frame->color_trc = s->profile_trc;
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}
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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static const AVFilterPad iccdetect_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 = iccdetect_filter_frame,
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},
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};
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static const AVFilterPad iccdetect_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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};
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const AVFilter ff_vf_iccdetect = {
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.name = "iccdetect",
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.description = NULL_IF_CONFIG_SMALL("Detect and parse ICC profiles."),
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.priv_size = sizeof(IccDetectContext),
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.priv_class = &iccdetect_class,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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.init = &iccdetect_init,
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.uninit = &iccdetect_uninit,
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FILTER_INPUTS(iccdetect_inputs),
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FILTER_OUTPUTS(iccdetect_outputs),
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};
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