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FFmpeg/libavfilter/vf_elbg.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Copyright (c) 2013 Stefano Sabatini
*
* 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
* video quantizer filter based on ELBG
*/
#include "libavcodec/elbg.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/random_seed.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct ELBGFilterContext {
const AVClass *class;
struct ELBGContext *ctx;
AVLFG lfg;
int64_t lfg_seed;
int max_steps_nb;
int *codeword;
int codeword_length;
int *codeword_closest_codebook_idxs;
int *codebook;
int codebook_length;
const AVPixFmtDescriptor *pix_desc;
uint8_t rgba_map[4];
int use_alpha;
int pal8;
} ELBGFilterContext;
#define OFFSET(x) offsetof(ELBGFilterContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption elbg_options[] = {
{ "codebook_length", "set codebook length", OFFSET(codebook_length), AV_OPT_TYPE_INT, { .i64 = 256 }, 1, INT_MAX, FLAGS },
{ "l", "set codebook length", OFFSET(codebook_length), AV_OPT_TYPE_INT, { .i64 = 256 }, 1, INT_MAX, FLAGS },
{ "nb_steps", "set max number of steps used to compute the mapping", OFFSET(max_steps_nb), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, FLAGS },
{ "n", "set max number of steps used to compute the mapping", OFFSET(max_steps_nb), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, INT_MAX, FLAGS },
{ "seed", "set the random seed", OFFSET(lfg_seed), AV_OPT_TYPE_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
{ "s", "set the random seed", OFFSET(lfg_seed), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, UINT32_MAX, FLAGS },
{ "pal8", "set the pal8 output", OFFSET(pal8), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "use_alpha", "use alpha channel for mapping", OFFSET(use_alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(elbg);
static av_cold int init(AVFilterContext *ctx)
{
ELBGFilterContext *const elbg = ctx->priv;
if (elbg->pal8 && elbg->codebook_length > 256) {
av_log(ctx, AV_LOG_ERROR, "pal8 output allows max 256 codebook length.\n");
return AVERROR(EINVAL);
}
if (elbg->lfg_seed == -1)
elbg->lfg_seed = av_get_random_seed();
av_lfg_init(&elbg->lfg, elbg->lfg_seed);
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
ELBGFilterContext *const elbg = ctx->priv;
int ret;
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_NONE
};
if (!elbg->pal8) {
return ff_set_common_formats_from_list(ctx, pix_fmts);
} else {
static const enum AVPixelFormat pal8_fmt[] = {
AV_PIX_FMT_PAL8,
AV_PIX_FMT_NONE
};
if ((ret = ff_formats_ref(ff_make_format_list(pix_fmts), &ctx->inputs[0]->outcfg.formats)) < 0 ||
(ret = ff_formats_ref(ff_make_format_list(pal8_fmt), &ctx->outputs[0]->incfg.formats)) < 0)
return ret;
}
return 0;
}
#define NB_COMPONENTS 4
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
ELBGFilterContext *const elbg = ctx->priv;
elbg->pix_desc = av_pix_fmt_desc_get(inlink->format);
elbg->codeword_length = inlink->w * inlink->h;
elbg->codeword = av_realloc_f(elbg->codeword, elbg->codeword_length,
NB_COMPONENTS * sizeof(*elbg->codeword));
if (!elbg->codeword)
return AVERROR(ENOMEM);
elbg->codeword_closest_codebook_idxs =
av_realloc_f(elbg->codeword_closest_codebook_idxs, elbg->codeword_length,
sizeof(*elbg->codeword_closest_codebook_idxs));
if (!elbg->codeword_closest_codebook_idxs)
return AVERROR(ENOMEM);
elbg->codebook = av_realloc_f(elbg->codebook, elbg->codebook_length,
NB_COMPONENTS * sizeof(*elbg->codebook));
if (!elbg->codebook)
return AVERROR(ENOMEM);
ff_fill_rgba_map(elbg->rgba_map, inlink->format);
return 0;
}
#define R 0
#define G 1
#define B 2
#define A 3
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
ELBGFilterContext *const elbg = inlink->dst->priv;
int i, j, k, ret;
uint8_t *p, *p0;
const uint8_t r_idx = elbg->rgba_map[R];
const uint8_t g_idx = elbg->rgba_map[G];
const uint8_t b_idx = elbg->rgba_map[B];
const uint8_t a_idx = elbg->rgba_map[A];
/* build the codeword */
p0 = frame->data[0];
k = 0;
for (i = 0; i < inlink->h; i++) {
p = p0;
for (j = 0; j < inlink->w; j++) {
elbg->codeword[k++] = p[b_idx];
elbg->codeword[k++] = p[g_idx];
elbg->codeword[k++] = p[r_idx];
elbg->codeword[k++] = elbg->use_alpha ? p[a_idx] : 0xff;
p += elbg->pix_desc->nb_components;
}
p0 += frame->linesize[0];
}
/* compute the codebook */
ret = avpriv_elbg_do(&elbg->ctx, elbg->codeword, NB_COMPONENTS,
elbg->codeword_length, elbg->codebook,
elbg->codebook_length, elbg->max_steps_nb,
elbg->codeword_closest_codebook_idxs, &elbg->lfg, 0);
if (ret < 0) {
av_frame_free(&frame);
return ret;
}
if (elbg->pal8) {
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
uint32_t *pal;
if (!out) {
av_frame_free(&frame);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, frame);
av_frame_free(&frame);
pal = (uint32_t *)out->data[1];
p0 = (uint8_t *)out->data[0];
for (i = 0; i < elbg->codebook_length; i++) {
const int al = elbg->use_alpha ? elbg->codebook[i*4+3] : 0xff;
pal[i] = al << 24 |
(elbg->codebook[i*4+2] << 16) |
(elbg->codebook[i*4+1] << 8) |
elbg->codebook[i*4 ];
}
k = 0;
for (i = 0; i < inlink->h; i++) {
p = p0;
for (j = 0; j < inlink->w; j++, p++) {
p[0] = elbg->codeword_closest_codebook_idxs[k++];
}
p0 += out->linesize[0];
}
return ff_filter_frame(outlink, out);
}
/* fill the output with the codebook values */
p0 = frame->data[0];
k = 0;
for (i = 0; i < inlink->h; i++) {
p = p0;
for (j = 0; j < inlink->w; j++) {
int cb_idx = NB_COMPONENTS * elbg->codeword_closest_codebook_idxs[k++];
p[b_idx] = elbg->codebook[cb_idx];
p[g_idx] = elbg->codebook[cb_idx+1];
p[r_idx] = elbg->codebook[cb_idx+2];
p[a_idx] = elbg->use_alpha ? elbg->codebook[cb_idx+3] : 0xFFu;
p += elbg->pix_desc->nb_components;
}
p0 += frame->linesize[0];
}
return ff_filter_frame(inlink->dst->outputs[0], frame);
}
static av_cold void uninit(AVFilterContext *ctx)
{
ELBGFilterContext *const elbg = ctx->priv;
avpriv_elbg_free(&elbg->ctx);
av_freep(&elbg->codebook);
av_freep(&elbg->codeword);
av_freep(&elbg->codeword_closest_codebook_idxs);
}
static const AVFilterPad elbg_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
const AVFilter ff_vf_elbg = {
.name = "elbg",
.description = NULL_IF_CONFIG_SMALL("Apply posterize effect, using the ELBG algorithm."),
.priv_size = sizeof(ELBGFilterContext),
.priv_class = &elbg_class,
.init = init,
.uninit = uninit,
FILTER_INPUTS(elbg_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
};
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