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/*
* Copyright (c) 2022 Niklas Haas
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* filter for generating ICC profiles
*/
#include <lcms2.h>
#include "libavutil/csp.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "fflcms2.h"
#include "internal.h"
#include "video.h"
typedef struct IccDetectContext {
const AVClass *class;
FFIccContext icc;
int force;
/* (cached) detected ICC profile values */
AVBufferRef *profile;
enum AVColorPrimaries profile_prim;
enum AVColorTransferCharacteristic profile_trc;
} IccDetectContext;
#define OFFSET(x) offsetof(IccDetectContext, x)
#define VF AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption iccdetect_options[] = {
{ "force", "overwrite existing tags", OFFSET(force), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, VF },
{ NULL }
};
AVFILTER_DEFINE_CLASS(iccdetect);
static av_cold void iccdetect_uninit(AVFilterContext *avctx)
{
IccDetectContext *s = avctx->priv;
av_buffer_unref(&s->profile);
ff_icc_context_uninit(&s->icc);
}
static av_cold int iccdetect_init(AVFilterContext *avctx)
{
IccDetectContext *s = avctx->priv;
return ff_icc_context_init(&s->icc, avctx);
}
static int iccdetect_filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *avctx = inlink->dst;
IccDetectContext *s = avctx->priv;
const AVFrameSideData *sd;
AVColorPrimariesDesc coeffs;
cmsHPROFILE profile;
int ret;
sd = av_frame_get_side_data(frame, AV_FRAME_DATA_ICC_PROFILE);
if (!sd)
return ff_filter_frame(inlink->dst->outputs[0], frame);
if (s->profile && s->profile->data == sd->buf->data) {
/* No change from previous ICC profile */
goto done;
}
if ((ret = av_buffer_replace(&s->profile, sd->buf)) < 0)
return ret;
s->profile_prim = AVCOL_PRI_UNSPECIFIED;
s->profile_trc = AVCOL_TRC_UNSPECIFIED;
profile = cmsOpenProfileFromMemTHR(s->icc.ctx, sd->data, sd->size);
if (!profile)
return AVERROR_INVALIDDATA;
ret = ff_icc_profile_read_primaries(&s->icc, profile, &coeffs);
if (!ret)
ret = ff_icc_profile_detect_transfer(&s->icc, profile, &s->profile_trc);
cmsCloseProfile(profile);
if (ret < 0)
return ret;
s->profile_prim = av_csp_primaries_id_from_desc(&coeffs);
done:
if (s->profile_prim != AVCOL_PRI_UNSPECIFIED) {
if (s->force || frame->color_primaries == AVCOL_PRI_UNSPECIFIED)
frame->color_primaries = s->profile_prim;
}
if (s->profile_trc != AVCOL_TRC_UNSPECIFIED) {
if (s->force || frame->color_trc == AVCOL_TRC_UNSPECIFIED)
frame->color_trc = s->profile_trc;
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static const AVFilterPad iccdetect_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = iccdetect_filter_frame,
},
};
const AVFilter ff_vf_iccdetect = {
.name = "iccdetect",
.description = NULL_IF_CONFIG_SMALL("Detect and parse ICC profiles."),
.priv_size = sizeof(IccDetectContext),
.priv_class = &iccdetect_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
.init = &iccdetect_init,
.uninit = &iccdetect_uninit,
FILTER_INPUTS(iccdetect_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
};
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