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/* |
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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/mem.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 "filters.h" |
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#include "formats.h" |
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#include "video.h" |
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typedef struct ELBGFilterContext { |
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const AVClass *class; |
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struct ELBGContext *ctx; |
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AVLFG lfg; |
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int64_t 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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int use_alpha; |
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int pal8; |
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} ELBGFilterContext; |
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#define OFFSET(x) offsetof(ELBGFilterContext, 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_INT64, {.i64 = -1}, -1, UINT32_MAX, FLAGS }, |
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{ "s", "set the random seed", OFFSET(lfg_seed), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, UINT32_MAX, FLAGS }, |
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{ "pal8", "set the pal8 output", OFFSET(pal8), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS }, |
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{ "use_alpha", "use alpha channel for mapping", OFFSET(use_alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, 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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ELBGFilterContext *const elbg = ctx->priv; |
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if (elbg->pal8 && elbg->codebook_length > 256) { |
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av_log(ctx, AV_LOG_ERROR, "pal8 output allows max 256 codebook length.\n"); |
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return AVERROR(EINVAL); |
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} |
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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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ELBGFilterContext *const elbg = ctx->priv; |
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int ret; |
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static const enum AVPixelFormat 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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if (!elbg->pal8) { |
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return ff_set_common_formats_from_list(ctx, pix_fmts); |
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} else { |
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static const enum AVPixelFormat pal8_fmt[] = { |
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AV_PIX_FMT_PAL8, |
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AV_PIX_FMT_NONE |
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}; |
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if ((ret = ff_formats_ref(ff_make_format_list(pix_fmts), &ctx->inputs[0]->outcfg.formats)) < 0 || |
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(ret = ff_formats_ref(ff_make_format_list(pal8_fmt), &ctx->outputs[0]->incfg.formats)) < 0) |
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return ret; |
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} |
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return 0; |
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} |
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#define NB_COMPONENTS 4 |
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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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ELBGFilterContext *const 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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#define A 3 |
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
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{ |
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ELBGFilterContext *const elbg = inlink->dst->priv; |
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int i, j, k, ret; |
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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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const uint8_t a_idx = elbg->rgba_map[A]; |
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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[b_idx]; |
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elbg->codeword[k++] = p[g_idx]; |
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elbg->codeword[k++] = p[r_idx]; |
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elbg->codeword[k++] = elbg->use_alpha ? p[a_idx] : 0xff; |
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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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ret = avpriv_elbg_do(&elbg->ctx, elbg->codeword, NB_COMPONENTS, |
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elbg->codeword_length, elbg->codebook, |
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elbg->codebook_length, elbg->max_steps_nb, |
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elbg->codeword_closest_codebook_idxs, &elbg->lfg, 0); |
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if (ret < 0) { |
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av_frame_free(&frame); |
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return ret; |
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} |
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if (elbg->pal8) { |
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AVFilterLink *outlink = inlink->dst->outputs[0]; |
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AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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uint32_t *pal; |
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if (!out) { |
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av_frame_free(&frame); |
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return AVERROR(ENOMEM); |
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} |
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av_frame_copy_props(out, frame); |
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av_frame_free(&frame); |
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pal = (uint32_t *)out->data[1]; |
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p0 = (uint8_t *)out->data[0]; |
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for (i = 0; i < elbg->codebook_length; i++) { |
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const unsigned al = elbg->use_alpha ? elbg->codebook[i*4+3] : 0xff; |
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pal[i] = al << 24 | |
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(elbg->codebook[i*4+2] << 16) | |
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(elbg->codebook[i*4+1] << 8) | |
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elbg->codebook[i*4 ]; |
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} |
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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++, p++) { |
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p[0] = elbg->codeword_closest_codebook_idxs[k++]; |
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} |
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p0 += out->linesize[0]; |
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} |
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return ff_filter_frame(outlink, out); |
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} |
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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[b_idx] = elbg->codebook[cb_idx]; |
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p[g_idx] = elbg->codebook[cb_idx+1]; |
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p[r_idx] = elbg->codebook[cb_idx+2]; |
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p[a_idx] = elbg->use_alpha ? elbg->codebook[cb_idx+3] : 0xFFu; |
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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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ELBGFilterContext *const elbg = ctx->priv; |
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avpriv_elbg_free(&elbg->ctx); |
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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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.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE, |
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.config_props = config_input, |
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.filter_frame = filter_frame, |
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}, |
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}; |
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const 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(ELBGFilterContext), |
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.priv_class = &elbg_class, |
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.init = init, |
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.uninit = uninit, |
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FILTER_INPUTS(elbg_inputs), |
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FILTER_OUTPUTS(ff_video_default_filterpad), |
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FILTER_QUERY_FUNC(query_formats), |
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}; |
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