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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/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/random_seed.h"
#include "avfilter.h"
#include "drawutils.h"
#include "internal.h"
#include "video.h"
typedef struct {
const AVClass *class;
AVLFG lfg;
int 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];
} ELBGContext;
#define OFFSET(x) offsetof(ELBGContext, 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_INT, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
{ "s", "set the random seed", OFFSET(lfg_seed), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(elbg);
static av_cold int init(AVFilterContext *ctx)
{
ELBGContext *elbg = ctx->priv;
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)
{
static const enum PixelFormat 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
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
#define NB_COMPONENTS 3
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
ELBGContext *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
static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
ELBGContext *elbg = inlink->dst->priv;
int i, j, k;
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];
/* 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[r_idx];
elbg->codeword[k++] = p[g_idx];
elbg->codeword[k++] = p[b_idx];
p += elbg->pix_desc->nb_components;
}
p0 += frame->linesize[0];
}
/* compute the codebook */
avpriv_init_elbg(elbg->codeword, NB_COMPONENTS, elbg->codeword_length,
elbg->codebook, elbg->codebook_length, elbg->max_steps_nb,
elbg->codeword_closest_codebook_idxs, &elbg->lfg);
avpriv_do_elbg(elbg->codeword, NB_COMPONENTS, elbg->codeword_length,
elbg->codebook, elbg->codebook_length, elbg->max_steps_nb,
elbg->codeword_closest_codebook_idxs, &elbg->lfg);
/* 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[r_idx] = elbg->codebook[cb_idx];
p[g_idx] = elbg->codebook[cb_idx+1];
p[b_idx] = elbg->codebook[cb_idx+2];
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)
{
ELBGContext *elbg = ctx->priv;
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,
.config_props = config_input,
.filter_frame = filter_frame,
.needs_writable = 1,
},
{ NULL }
};
static const AVFilterPad elbg_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_elbg = {
.name = "elbg",
.description = NULL_IF_CONFIG_SMALL("Apply posterize effect, using the ELBG algorithm."),
.priv_size = sizeof(ELBGContext),
.priv_class = &elbg_class,
.query_formats = query_formats,
.init = init,
.uninit = uninit,
.inputs = elbg_inputs,
.outputs = elbg_outputs,
};
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