213 lines
6.5 KiB
C
213 lines
6.5 KiB
C
/*
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* Copyright (c) 2013 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* video quantizer filter based on ELBG
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*/
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#include "libavcodec/elbg.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/random_seed.h"
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#include "avfilter.h"
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#include "drawutils.h"
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#include "internal.h"
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#include "video.h"
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typedef struct {
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const AVClass *class;
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AVLFG lfg;
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int lfg_seed;
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int max_steps_nb;
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int *codeword;
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int codeword_length;
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int *codeword_closest_codebook_idxs;
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int *codebook;
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int codebook_length;
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const AVPixFmtDescriptor *pix_desc;
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uint8_t rgba_map[4];
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} ELBGContext;
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#define OFFSET(x) offsetof(ELBGContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption elbg_options[] = {
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{ "codebook_length", "set codebook length", OFFSET(codebook_length), AV_OPT_TYPE_INT, { .i64 = 256 }, 1, INT_MAX, FLAGS },
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{ "l", "set codebook length", OFFSET(codebook_length), AV_OPT_TYPE_INT, { .i64 = 256 }, 1, INT_MAX, FLAGS },
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{ "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 },
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{ "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 },
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{ "seed", "set the random seed", OFFSET(lfg_seed), AV_OPT_TYPE_INT, {.i64 = -1}, -1, UINT32_MAX, FLAGS },
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{ "s", "set the random seed", OFFSET(lfg_seed), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(elbg);
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static av_cold int init(AVFilterContext *ctx)
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{
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ELBGContext *elbg = ctx->priv;
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if (elbg->lfg_seed == -1)
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elbg->lfg_seed = av_get_random_seed();
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av_lfg_init(&elbg->lfg, elbg->lfg_seed);
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum PixelFormat pix_fmts[] = {
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AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA, AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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#define NB_COMPONENTS 3
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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ELBGContext *elbg = ctx->priv;
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elbg->pix_desc = av_pix_fmt_desc_get(inlink->format);
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elbg->codeword_length = inlink->w * inlink->h;
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elbg->codeword = av_realloc_f(elbg->codeword, elbg->codeword_length,
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NB_COMPONENTS * sizeof(*elbg->codeword));
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if (!elbg->codeword)
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return AVERROR(ENOMEM);
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elbg->codeword_closest_codebook_idxs =
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av_realloc_f(elbg->codeword_closest_codebook_idxs, elbg->codeword_length,
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sizeof(*elbg->codeword_closest_codebook_idxs));
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if (!elbg->codeword_closest_codebook_idxs)
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return AVERROR(ENOMEM);
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elbg->codebook = av_realloc_f(elbg->codebook, elbg->codebook_length,
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NB_COMPONENTS * sizeof(*elbg->codebook));
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if (!elbg->codebook)
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return AVERROR(ENOMEM);
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ff_fill_rgba_map(elbg->rgba_map, inlink->format);
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return 0;
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}
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#define R 0
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#define G 1
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#define B 2
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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ELBGContext *elbg = inlink->dst->priv;
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int i, j, k;
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uint8_t *p, *p0;
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const uint8_t r_idx = elbg->rgba_map[R];
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const uint8_t g_idx = elbg->rgba_map[G];
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const uint8_t b_idx = elbg->rgba_map[B];
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/* build the codeword */
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p0 = frame->data[0];
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k = 0;
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for (i = 0; i < inlink->h; i++) {
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p = p0;
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for (j = 0; j < inlink->w; j++) {
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elbg->codeword[k++] = p[r_idx];
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elbg->codeword[k++] = p[g_idx];
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elbg->codeword[k++] = p[b_idx];
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p += elbg->pix_desc->nb_components;
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}
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p0 += frame->linesize[0];
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}
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/* compute the codebook */
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avpriv_init_elbg(elbg->codeword, NB_COMPONENTS, elbg->codeword_length,
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elbg->codebook, elbg->codebook_length, elbg->max_steps_nb,
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elbg->codeword_closest_codebook_idxs, &elbg->lfg);
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avpriv_do_elbg(elbg->codeword, NB_COMPONENTS, elbg->codeword_length,
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elbg->codebook, elbg->codebook_length, elbg->max_steps_nb,
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elbg->codeword_closest_codebook_idxs, &elbg->lfg);
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/* fill the output with the codebook values */
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p0 = frame->data[0];
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k = 0;
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for (i = 0; i < inlink->h; i++) {
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p = p0;
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for (j = 0; j < inlink->w; j++) {
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int cb_idx = NB_COMPONENTS * elbg->codeword_closest_codebook_idxs[k++];
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p[r_idx] = elbg->codebook[cb_idx];
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p[g_idx] = elbg->codebook[cb_idx+1];
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p[b_idx] = elbg->codebook[cb_idx+2];
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p += elbg->pix_desc->nb_components;
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}
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p0 += frame->linesize[0];
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}
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return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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ELBGContext *elbg = ctx->priv;
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av_freep(&elbg->codebook);
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av_freep(&elbg->codeword);
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av_freep(&elbg->codeword_closest_codebook_idxs);
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}
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static const AVFilterPad elbg_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = filter_frame,
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.needs_writable = 1,
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},
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{ NULL }
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};
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static const AVFilterPad elbg_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter ff_vf_elbg = {
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.name = "elbg",
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.description = NULL_IF_CONFIG_SMALL("Apply posterize effect, using the ELBG algorithm."),
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.priv_size = sizeof(ELBGContext),
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.priv_class = &elbg_class,
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.query_formats = query_formats,
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.init = init,
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.uninit = uninit,
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.inputs = elbg_inputs,
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.outputs = elbg_outputs,
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};
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