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FFmpeg/libavfilter/vf_iccgen.c
Andreas Rheinhardt 2f62a433f2 avfilter: Deduplicate default video inputs/outputs 
Lots of video filters use a very simple input or output:
An array with a single AVFilterPad whose name is "default"
and whose type is AVMEDIA_TYPE_VIDEO; everything else is unset.

Given that we never use pointer equality for inputs or outputs*,
we can simply use a single AVFilterPad instead of dozens; this
even saves .data.rel.ro (8312B here) as well as relocations.

*: In fact, several filters (like the filters in vf_lut.c)
already use the same outputs; furthermore, ff_filter_alloc()
duplicates the input and output pads so that we do not even
work with the pads directly.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-08-07 09:21:13 +02:00

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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/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "fflcms2.h"
#include "internal.h"
#include "video.h"
typedef struct IccGenContext {
const AVClass *class;
FFIccContext icc;
/* options */
int color_prim;
int color_trc;
int force;
/* (cached) generated ICC profile */
cmsHPROFILE profile;
int profile_prim;
int profile_trc;
} IccGenContext;
#define OFFSET(x) offsetof(IccGenContext, x)
#define VF AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption iccgen_options[] = {
{"color_primaries", "select color primaries", OFFSET(color_prim), AV_OPT_TYPE_INT, {.i64=0}, 0, AVCOL_PRI_NB-1, VF, "color_primaries"},
{"auto", "infer based on frame", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, VF, "color_primaries"},
{"bt709", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT709}, 0, 0, VF, "color_primaries"},
{"bt470m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT470M}, 0, 0, VF, "color_primaries"},
{"bt470bg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT470BG}, 0, 0, VF, "color_primaries"},
{"smpte170m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE170M}, 0, 0, VF, "color_primaries"},
{"smpte240m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE240M}, 0, 0, VF, "color_primaries"},
{"film", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_FILM}, 0, 0, VF, "color_primaries"},
{"bt2020", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_BT2020}, 0, 0, VF, "color_primaries"},
{"smpte428", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE428}, 0, 0, VF, "color_primaries"},
{"smpte431", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE431}, 0, 0, VF, "color_primaries"},
{"smpte432", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_SMPTE432}, 0, 0, VF, "color_primaries"},
{"jedec-p22", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_JEDEC_P22}, 0, 0, VF, "color_primaries"},
{"ebu3213", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_PRI_EBU3213}, 0, 0, VF, "color_primaries"},
{"color_trc", "select color transfer", OFFSET(color_trc), AV_OPT_TYPE_INT, {.i64=0}, 0, AVCOL_TRC_NB-1, VF, "color_trc"},
{"auto", "infer based on frame", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, VF, "color_trc"},
{"bt709", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_BT709}, 0, 0, VF, "color_trc"},
{"bt470m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_GAMMA22}, 0, 0, VF, "color_trc"},
{"bt470bg", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_GAMMA28}, 0, 0, VF, "color_trc"},
{"smpte170m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_SMPTE170M}, 0, 0, VF, "color_trc"},
{"smpte240m", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_SMPTE240M}, 0, 0, VF, "color_trc"},
{"linear", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_LINEAR}, 0, 0, VF, "color_trc"},
{"iec61966-2-4", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_IEC61966_2_4}, 0, 0, VF, "color_trc"},
{"bt1361e", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_BT1361_ECG}, 0, 0, VF, "color_trc"},
{"iec61966-2-1", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_IEC61966_2_1}, 0, 0, VF, "color_trc"},
{"bt2020-10", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_BT2020_10}, 0, 0, VF, "color_trc"},
{"bt2020-12", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_BT2020_12}, 0, 0, VF, "color_trc"},
{"smpte2084", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_SMPTE2084}, 0, 0, VF, "color_trc"},
{"arib-std-b67", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCOL_TRC_ARIB_STD_B67}, 0, 0, VF, "color_trc"},
{ "force", "overwrite existing ICC profile", OFFSET(force), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, VF },
{ NULL }
};
AVFILTER_DEFINE_CLASS(iccgen);
static av_cold void iccgen_uninit(AVFilterContext *avctx)
{
IccGenContext *s = avctx->priv;
cmsCloseProfile(s->profile);
ff_icc_context_uninit(&s->icc);
}
static av_cold int iccgen_init(AVFilterContext *avctx)
{
IccGenContext *s = avctx->priv;
return ff_icc_context_init(&s->icc, avctx);
}
static int iccgen_filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *avctx = inlink->dst;
IccGenContext *s = avctx->priv;
enum AVColorTransferCharacteristic trc;
enum AVColorPrimaries prim;
int ret;
if (av_frame_get_side_data(frame, AV_FRAME_DATA_ICC_PROFILE)) {
if (s->force) {
av_frame_remove_side_data(frame, AV_FRAME_DATA_ICC_PROFILE);
} else {
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
}
trc = s->color_trc ? s->color_trc : frame->color_trc;
if (trc == AVCOL_TRC_UNSPECIFIED) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
if (!desc)
return AVERROR_INVALIDDATA;
if ((desc->flags & AV_PIX_FMT_FLAG_RGB) || frame->color_range == AVCOL_RANGE_JPEG) {
/* Default to sRGB for RGB or full-range content */
trc = AVCOL_TRC_IEC61966_2_1;
} else {
/* Default to an ITU-R transfer depending on the bit-depth */
trc = desc->comp[0].depth >= 12 ? AVCOL_TRC_BT2020_12
: desc->comp[0].depth >= 10 ? AVCOL_TRC_BT2020_10
: AVCOL_TRC_BT709;
}
}
prim = s->color_prim ? s->color_prim : frame->color_primaries;
if (prim == AVCOL_PRI_UNSPECIFIED) {
/* Simply always default to sRGB/BT.709 primaries to avoid surprises */
prim = AVCOL_PRI_BT709;
}
if (s->profile && prim != s->profile_prim && trc != s->profile_trc) {
cmsCloseProfile(s->profile);
s->profile = NULL;
}
if (!s->profile) {
if ((ret = ff_icc_profile_generate(&s->icc, prim, trc, &s->profile)) < 0)
return ret;
s->profile_prim = prim;
s->profile_trc = trc;
}
if ((ret = ff_icc_profile_attach(&s->icc, s->profile, frame)) < 0)
return ret;
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static const AVFilterPad iccgen_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = iccgen_filter_frame,
},
};
const AVFilter ff_vf_iccgen = {
.name = "iccgen",
.description = NULL_IF_CONFIG_SMALL("Generate and attach ICC profiles."),
.priv_size = sizeof(IccGenContext),
.priv_class = &iccgen_class,
.flags = AVFILTER_FLAG_METADATA_ONLY,
.init = &iccgen_init,
.uninit = &iccgen_uninit,
FILTER_INPUTS(iccgen_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
};
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