/* * 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 ColorContext { const AVClass *class; AVLFG lfg; unsigned 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, UINT32_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, };