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FFmpeg/libavfilter/vf_elbg.c
Michael Niedermayer 2af95b9214
avfilter/vf_elbg: Use unsigned for shifting into the top bit 
Fixes: part of CID1355110 Overflowed constant

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2024-07-21 16:34:25 +02:00

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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 unsigned 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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