mirror of https://git.ffmpeg.org/ffmpeg.git
1087 lines
40 KiB
C
1087 lines
40 KiB
C
/*
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* Copyright (c) 2015 Stupeflix
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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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* Use a palette to downsample an input video stream.
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*/
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#include "libavutil/bprint.h"
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "libavutil/qsort.h"
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#include "dualinput.h"
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#include "avfilter.h"
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enum dithering_mode {
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DITHERING_NONE,
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DITHERING_BAYER,
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DITHERING_HECKBERT,
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DITHERING_FLOYD_STEINBERG,
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DITHERING_SIERRA2,
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DITHERING_SIERRA2_4A,
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NB_DITHERING
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};
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enum color_search_method {
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COLOR_SEARCH_NNS_ITERATIVE,
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COLOR_SEARCH_NNS_RECURSIVE,
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COLOR_SEARCH_BRUTEFORCE,
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NB_COLOR_SEARCHES
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};
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enum diff_mode {
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DIFF_MODE_NONE,
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DIFF_MODE_RECTANGLE,
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NB_DIFF_MODE
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};
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struct color_node {
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uint8_t val[3];
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uint8_t palette_id;
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int split;
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int left_id, right_id;
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};
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#define NBITS 5
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#define CACHE_SIZE (1<<(3*NBITS))
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struct cached_color {
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uint32_t color;
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uint8_t pal_entry;
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};
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struct cache_node {
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struct cached_color *entries;
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int nb_entries;
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};
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struct PaletteUseContext;
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typedef int (*set_frame_func)(struct PaletteUseContext *s, AVFrame *out, AVFrame *in,
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int x_start, int y_start, int width, int height);
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typedef struct PaletteUseContext {
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const AVClass *class;
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FFDualInputContext dinput;
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struct cache_node cache[CACHE_SIZE]; /* lookup cache */
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struct color_node map[AVPALETTE_COUNT]; /* 3D-Tree (KD-Tree with K=3) for reverse colormap */
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uint32_t palette[AVPALETTE_COUNT];
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int palette_loaded;
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int dither;
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int new;
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set_frame_func set_frame;
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int bayer_scale;
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int ordered_dither[8*8];
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int diff_mode;
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AVFrame *last_in;
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AVFrame *last_out;
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/* debug options */
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char *dot_filename;
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int color_search_method;
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int calc_mean_err;
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uint64_t total_mean_err;
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int debug_accuracy;
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} PaletteUseContext;
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#define OFFSET(x) offsetof(PaletteUseContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption paletteuse_options[] = {
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{ "dither", "select dithering mode", OFFSET(dither), AV_OPT_TYPE_INT, {.i64=DITHERING_SIERRA2_4A}, 0, NB_DITHERING-1, FLAGS, "dithering_mode" },
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{ "bayer", "ordered 8x8 bayer dithering (deterministic)", 0, AV_OPT_TYPE_CONST, {.i64=DITHERING_BAYER}, INT_MIN, INT_MAX, FLAGS, "dithering_mode" },
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{ "heckbert", "dithering as defined by Paul Heckbert in 1982 (simple error diffusion)", 0, AV_OPT_TYPE_CONST, {.i64=DITHERING_HECKBERT}, INT_MIN, INT_MAX, FLAGS, "dithering_mode" },
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{ "floyd_steinberg", "Floyd and Steingberg dithering (error diffusion)", 0, AV_OPT_TYPE_CONST, {.i64=DITHERING_FLOYD_STEINBERG}, INT_MIN, INT_MAX, FLAGS, "dithering_mode" },
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{ "sierra2", "Frankie Sierra dithering v2 (error diffusion)", 0, AV_OPT_TYPE_CONST, {.i64=DITHERING_SIERRA2}, INT_MIN, INT_MAX, FLAGS, "dithering_mode" },
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{ "sierra2_4a", "Frankie Sierra dithering v2 \"Lite\" (error diffusion)", 0, AV_OPT_TYPE_CONST, {.i64=DITHERING_SIERRA2_4A}, INT_MIN, INT_MAX, FLAGS, "dithering_mode" },
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{ "bayer_scale", "set scale for bayer dithering", OFFSET(bayer_scale), AV_OPT_TYPE_INT, {.i64=2}, 0, 5, FLAGS },
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{ "diff_mode", "set frame difference mode", OFFSET(diff_mode), AV_OPT_TYPE_INT, {.i64=DIFF_MODE_NONE}, 0, NB_DIFF_MODE-1, FLAGS, "diff_mode" },
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{ "rectangle", "process smallest different rectangle", 0, AV_OPT_TYPE_CONST, {.i64=DIFF_MODE_RECTANGLE}, INT_MIN, INT_MAX, FLAGS, "diff_mode" },
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/* following are the debug options, not part of the official API */
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{ "debug_kdtree", "save Graphviz graph of the kdtree in specified file", OFFSET(dot_filename), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "color_search", "set reverse colormap color search method", OFFSET(color_search_method), AV_OPT_TYPE_INT, {.i64=COLOR_SEARCH_NNS_ITERATIVE}, 0, NB_COLOR_SEARCHES-1, FLAGS, "search" },
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{ "nns_iterative", "iterative search", 0, AV_OPT_TYPE_CONST, {.i64=COLOR_SEARCH_NNS_ITERATIVE}, INT_MIN, INT_MAX, FLAGS, "search" },
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{ "nns_recursive", "recursive search", 0, AV_OPT_TYPE_CONST, {.i64=COLOR_SEARCH_NNS_RECURSIVE}, INT_MIN, INT_MAX, FLAGS, "search" },
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{ "bruteforce", "brute-force into the palette", 0, AV_OPT_TYPE_CONST, {.i64=COLOR_SEARCH_BRUTEFORCE}, INT_MIN, INT_MAX, FLAGS, "search" },
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{ "mean_err", "compute and print mean error", OFFSET(calc_mean_err), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
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{ "debug_accuracy", "test color search accuracy", OFFSET(debug_accuracy), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
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{ "new", "take new palette for each output frame", OFFSET(new), 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(paletteuse);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat in_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
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static const enum AVPixelFormat inpal_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
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static const enum AVPixelFormat out_fmts[] = {AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE};
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int ret;
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AVFilterFormats *in = ff_make_format_list(in_fmts);
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AVFilterFormats *inpal = ff_make_format_list(inpal_fmts);
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AVFilterFormats *out = ff_make_format_list(out_fmts);
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if (!in || !inpal || !out) {
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av_freep(&in);
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av_freep(&inpal);
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av_freep(&out);
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return AVERROR(ENOMEM);
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}
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if ((ret = ff_formats_ref(in , &ctx->inputs[0]->out_formats)) < 0 ||
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(ret = ff_formats_ref(inpal, &ctx->inputs[1]->out_formats)) < 0 ||
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(ret = ff_formats_ref(out , &ctx->outputs[0]->in_formats)) < 0)
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return ret;
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return 0;
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}
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static av_always_inline int dither_color(uint32_t px, int er, int eg, int eb, int scale, int shift)
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{
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return av_clip_uint8((px >> 16 & 0xff) + ((er * scale) / (1<<shift))) << 16
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| av_clip_uint8((px >> 8 & 0xff) + ((eg * scale) / (1<<shift))) << 8
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| av_clip_uint8((px & 0xff) + ((eb * scale) / (1<<shift)));
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}
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static av_always_inline int diff(const uint8_t *c1, const uint8_t *c2)
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{
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// XXX: try L*a*b with CIE76 (dL*dL + da*da + db*db)
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const int dr = c1[0] - c2[0];
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const int dg = c1[1] - c2[1];
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const int db = c1[2] - c2[2];
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return dr*dr + dg*dg + db*db;
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}
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static av_always_inline uint8_t colormap_nearest_bruteforce(const uint32_t *palette, const uint8_t *rgb)
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{
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int i, pal_id = -1, min_dist = INT_MAX;
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for (i = 0; i < AVPALETTE_COUNT; i++) {
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const uint32_t c = palette[i];
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if ((c & 0xff000000) == 0xff000000) { // ignore transparent entry
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const uint8_t palrgb[] = {
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palette[i]>>16 & 0xff,
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palette[i]>> 8 & 0xff,
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palette[i] & 0xff,
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};
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const int d = diff(palrgb, rgb);
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if (d < min_dist) {
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pal_id = i;
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min_dist = d;
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}
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}
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}
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return pal_id;
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}
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/* Recursive form, simpler but a bit slower. Kept for reference. */
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struct nearest_color {
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int node_pos;
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int dist_sqd;
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};
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static void colormap_nearest_node(const struct color_node *map,
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const int node_pos,
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const uint8_t *target,
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struct nearest_color *nearest)
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{
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const struct color_node *kd = map + node_pos;
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const int s = kd->split;
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int dx, nearer_kd_id, further_kd_id;
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const uint8_t *current = kd->val;
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const int current_to_target = diff(target, current);
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if (current_to_target < nearest->dist_sqd) {
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nearest->node_pos = node_pos;
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nearest->dist_sqd = current_to_target;
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}
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if (kd->left_id != -1 || kd->right_id != -1) {
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dx = target[s] - current[s];
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if (dx <= 0) nearer_kd_id = kd->left_id, further_kd_id = kd->right_id;
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else nearer_kd_id = kd->right_id, further_kd_id = kd->left_id;
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if (nearer_kd_id != -1)
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colormap_nearest_node(map, nearer_kd_id, target, nearest);
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if (further_kd_id != -1 && dx*dx < nearest->dist_sqd)
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colormap_nearest_node(map, further_kd_id, target, nearest);
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}
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}
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static av_always_inline uint8_t colormap_nearest_recursive(const struct color_node *node, const uint8_t *rgb)
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{
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struct nearest_color res = {.dist_sqd = INT_MAX, .node_pos = -1};
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colormap_nearest_node(node, 0, rgb, &res);
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return node[res.node_pos].palette_id;
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}
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struct stack_node {
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int color_id;
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int dx2;
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};
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static av_always_inline uint8_t colormap_nearest_iterative(const struct color_node *root, const uint8_t *target)
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{
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int pos = 0, best_node_id = -1, best_dist = INT_MAX, cur_color_id = 0;
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struct stack_node nodes[16];
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struct stack_node *node = &nodes[0];
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for (;;) {
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const struct color_node *kd = &root[cur_color_id];
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const uint8_t *current = kd->val;
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const int current_to_target = diff(target, current);
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/* Compare current color node to the target and update our best node if
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* it's actually better. */
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if (current_to_target < best_dist) {
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best_node_id = cur_color_id;
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if (!current_to_target)
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goto end; // exact match, we can return immediately
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best_dist = current_to_target;
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}
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/* Check if it's not a leaf */
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if (kd->left_id != -1 || kd->right_id != -1) {
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const int split = kd->split;
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const int dx = target[split] - current[split];
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int nearer_kd_id, further_kd_id;
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/* Define which side is the most interesting. */
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if (dx <= 0) nearer_kd_id = kd->left_id, further_kd_id = kd->right_id;
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else nearer_kd_id = kd->right_id, further_kd_id = kd->left_id;
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if (nearer_kd_id != -1) {
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if (further_kd_id != -1) {
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/* Here, both paths are defined, so we push a state for
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* when we are going back. */
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node->color_id = further_kd_id;
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node->dx2 = dx*dx;
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pos++;
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node++;
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}
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/* We can now update current color with the most probable path
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* (no need to create a state since there is nothing to save
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* anymore). */
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cur_color_id = nearer_kd_id;
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continue;
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} else if (dx*dx < best_dist) {
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/* The nearest path isn't available, so there is only one path
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* possible and it's the least probable. We enter it only if the
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* distance from the current point to the hyper rectangle is
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* less than our best distance. */
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cur_color_id = further_kd_id;
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continue;
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}
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}
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/* Unstack as much as we can, typically as long as the least probable
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* branch aren't actually probable. */
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do {
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if (--pos < 0)
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goto end;
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node--;
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} while (node->dx2 >= best_dist);
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/* We got a node where the least probable branch might actually contain
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* a relevant color. */
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cur_color_id = node->color_id;
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}
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end:
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return root[best_node_id].palette_id;
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}
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#define COLORMAP_NEAREST(search, palette, root, target) \
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search == COLOR_SEARCH_NNS_ITERATIVE ? colormap_nearest_iterative(root, target) : \
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search == COLOR_SEARCH_NNS_RECURSIVE ? colormap_nearest_recursive(root, target) : \
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colormap_nearest_bruteforce(palette, target)
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/**
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* Check if the requested color is in the cache already. If not, find it in the
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* color tree and cache it.
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* Note: r, g, and b are the component of c but are passed as well to avoid
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* recomputing them (they are generally computed by the caller for other uses).
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*/
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static av_always_inline int color_get(struct cache_node *cache, uint32_t color,
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uint8_t r, uint8_t g, uint8_t b,
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const struct color_node *map,
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const uint32_t *palette,
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const enum color_search_method search_method)
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{
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int i;
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const uint8_t rgb[] = {r, g, b};
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const uint8_t rhash = r & ((1<<NBITS)-1);
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const uint8_t ghash = g & ((1<<NBITS)-1);
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const uint8_t bhash = b & ((1<<NBITS)-1);
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const unsigned hash = rhash<<(NBITS*2) | ghash<<NBITS | bhash;
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struct cache_node *node = &cache[hash];
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struct cached_color *e;
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for (i = 0; i < node->nb_entries; i++) {
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e = &node->entries[i];
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if (e->color == color)
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return e->pal_entry;
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}
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e = av_dynarray2_add((void**)&node->entries, &node->nb_entries,
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sizeof(*node->entries), NULL);
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if (!e)
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return AVERROR(ENOMEM);
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e->color = color;
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e->pal_entry = COLORMAP_NEAREST(search_method, palette, map, rgb);
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return e->pal_entry;
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}
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static av_always_inline int get_dst_color_err(struct cache_node *cache,
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uint32_t c, const struct color_node *map,
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const uint32_t *palette,
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int *er, int *eg, int *eb,
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const enum color_search_method search_method)
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{
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const uint8_t r = c >> 16 & 0xff;
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const uint8_t g = c >> 8 & 0xff;
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const uint8_t b = c & 0xff;
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const int dstx = color_get(cache, c, r, g, b, map, palette, search_method);
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const uint32_t dstc = palette[dstx];
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*er = r - (dstc >> 16 & 0xff);
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*eg = g - (dstc >> 8 & 0xff);
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*eb = b - (dstc & 0xff);
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return dstx;
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}
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static av_always_inline int set_frame(PaletteUseContext *s, AVFrame *out, AVFrame *in,
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int x_start, int y_start, int w, int h,
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enum dithering_mode dither,
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const enum color_search_method search_method)
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{
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int x, y;
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const struct color_node *map = s->map;
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struct cache_node *cache = s->cache;
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const uint32_t *palette = s->palette;
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const int src_linesize = in ->linesize[0] >> 2;
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const int dst_linesize = out->linesize[0];
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uint32_t *src = ((uint32_t *)in ->data[0]) + y_start*src_linesize;
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uint8_t *dst = out->data[0] + y_start*dst_linesize;
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w += x_start;
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h += y_start;
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for (y = y_start; y < h; y++) {
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for (x = x_start; x < w; x++) {
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int er, eg, eb;
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if (dither == DITHERING_BAYER) {
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const int d = s->ordered_dither[(y & 7)<<3 | (x & 7)];
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const uint8_t r8 = src[x] >> 16 & 0xff;
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const uint8_t g8 = src[x] >> 8 & 0xff;
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const uint8_t b8 = src[x] & 0xff;
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const uint8_t r = av_clip_uint8(r8 + d);
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const uint8_t g = av_clip_uint8(g8 + d);
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const uint8_t b = av_clip_uint8(b8 + d);
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const uint32_t c = r<<16 | g<<8 | b;
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const int color = color_get(cache, c, r, g, b, map, palette, search_method);
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if (color < 0)
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return color;
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dst[x] = color;
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} else if (dither == DITHERING_HECKBERT) {
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const int right = x < w - 1, down = y < h - 1;
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const int color = get_dst_color_err(cache, src[x], map, palette, &er, &eg, &eb, search_method);
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if (color < 0)
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return color;
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dst[x] = color;
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if (right) src[ x + 1] = dither_color(src[ x + 1], er, eg, eb, 3, 3);
|
|
if ( down) src[src_linesize + x ] = dither_color(src[src_linesize + x ], er, eg, eb, 3, 3);
|
|
if (right && down) src[src_linesize + x + 1] = dither_color(src[src_linesize + x + 1], er, eg, eb, 2, 3);
|
|
|
|
} else if (dither == DITHERING_FLOYD_STEINBERG) {
|
|
const int right = x < w - 1, down = y < h - 1, left = x > x_start;
|
|
const int color = get_dst_color_err(cache, src[x], map, palette, &er, &eg, &eb, search_method);
|
|
|
|
if (color < 0)
|
|
return color;
|
|
dst[x] = color;
|
|
|
|
if (right) src[ x + 1] = dither_color(src[ x + 1], er, eg, eb, 7, 4);
|
|
if (left && down) src[src_linesize + x - 1] = dither_color(src[src_linesize + x - 1], er, eg, eb, 3, 4);
|
|
if ( down) src[src_linesize + x ] = dither_color(src[src_linesize + x ], er, eg, eb, 5, 4);
|
|
if (right && down) src[src_linesize + x + 1] = dither_color(src[src_linesize + x + 1], er, eg, eb, 1, 4);
|
|
|
|
} else if (dither == DITHERING_SIERRA2) {
|
|
const int right = x < w - 1, down = y < h - 1, left = x > x_start;
|
|
const int right2 = x < w - 2, left2 = x > x_start + 1;
|
|
const int color = get_dst_color_err(cache, src[x], map, palette, &er, &eg, &eb, search_method);
|
|
|
|
if (color < 0)
|
|
return color;
|
|
dst[x] = color;
|
|
|
|
if (right) src[ x + 1] = dither_color(src[ x + 1], er, eg, eb, 4, 4);
|
|
if (right2) src[ x + 2] = dither_color(src[ x + 2], er, eg, eb, 3, 4);
|
|
|
|
if (down) {
|
|
if (left2) src[ src_linesize + x - 2] = dither_color(src[ src_linesize + x - 2], er, eg, eb, 1, 4);
|
|
if (left) src[ src_linesize + x - 1] = dither_color(src[ src_linesize + x - 1], er, eg, eb, 2, 4);
|
|
src[ src_linesize + x ] = dither_color(src[ src_linesize + x ], er, eg, eb, 3, 4);
|
|
if (right) src[ src_linesize + x + 1] = dither_color(src[ src_linesize + x + 1], er, eg, eb, 2, 4);
|
|
if (right2) src[ src_linesize + x + 2] = dither_color(src[ src_linesize + x + 2], er, eg, eb, 1, 4);
|
|
}
|
|
|
|
} else if (dither == DITHERING_SIERRA2_4A) {
|
|
const int right = x < w - 1, down = y < h - 1, left = x > x_start;
|
|
const int color = get_dst_color_err(cache, src[x], map, palette, &er, &eg, &eb, search_method);
|
|
|
|
if (color < 0)
|
|
return color;
|
|
dst[x] = color;
|
|
|
|
if (right) src[ x + 1] = dither_color(src[ x + 1], er, eg, eb, 2, 2);
|
|
if (left && down) src[src_linesize + x - 1] = dither_color(src[src_linesize + x - 1], er, eg, eb, 1, 2);
|
|
if ( down) src[src_linesize + x ] = dither_color(src[src_linesize + x ], er, eg, eb, 1, 2);
|
|
|
|
} else {
|
|
const uint8_t r = src[x] >> 16 & 0xff;
|
|
const uint8_t g = src[x] >> 8 & 0xff;
|
|
const uint8_t b = src[x] & 0xff;
|
|
const int color = color_get(cache, src[x] & 0xffffff, r, g, b, map, palette, search_method);
|
|
|
|
if (color < 0)
|
|
return color;
|
|
dst[x] = color;
|
|
}
|
|
}
|
|
src += src_linesize;
|
|
dst += dst_linesize;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#define INDENT 4
|
|
static void disp_node(AVBPrint *buf,
|
|
const struct color_node *map,
|
|
int parent_id, int node_id,
|
|
int depth)
|
|
{
|
|
const struct color_node *node = &map[node_id];
|
|
const uint32_t fontcolor = node->val[0] > 0x50 &&
|
|
node->val[1] > 0x50 &&
|
|
node->val[2] > 0x50 ? 0 : 0xffffff;
|
|
av_bprintf(buf, "%*cnode%d ["
|
|
"label=\"%c%02X%c%02X%c%02X%c\" "
|
|
"fillcolor=\"#%02x%02x%02x\" "
|
|
"fontcolor=\"#%06X\"]\n",
|
|
depth*INDENT, ' ', node->palette_id,
|
|
"[ "[node->split], node->val[0],
|
|
"][ "[node->split], node->val[1],
|
|
" ]["[node->split], node->val[2],
|
|
" ]"[node->split],
|
|
node->val[0], node->val[1], node->val[2],
|
|
fontcolor);
|
|
if (parent_id != -1)
|
|
av_bprintf(buf, "%*cnode%d -> node%d\n", depth*INDENT, ' ',
|
|
map[parent_id].palette_id, node->palette_id);
|
|
if (node->left_id != -1) disp_node(buf, map, node_id, node->left_id, depth + 1);
|
|
if (node->right_id != -1) disp_node(buf, map, node_id, node->right_id, depth + 1);
|
|
}
|
|
|
|
// debug_kdtree=kdtree.dot -> dot -Tpng kdtree.dot > kdtree.png
|
|
static int disp_tree(const struct color_node *node, const char *fname)
|
|
{
|
|
AVBPrint buf;
|
|
FILE *f = av_fopen_utf8(fname, "w");
|
|
|
|
if (!f) {
|
|
int ret = AVERROR(errno);
|
|
av_log(NULL, AV_LOG_ERROR, "Cannot open file '%s' for writing: %s\n",
|
|
fname, av_err2str(ret));
|
|
return ret;
|
|
}
|
|
|
|
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
|
|
|
|
av_bprintf(&buf, "digraph {\n");
|
|
av_bprintf(&buf, " node [style=filled fontsize=10 shape=box]\n");
|
|
disp_node(&buf, node, -1, 0, 0);
|
|
av_bprintf(&buf, "}\n");
|
|
|
|
fwrite(buf.str, 1, buf.len, f);
|
|
fclose(f);
|
|
av_bprint_finalize(&buf, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static int debug_accuracy(const struct color_node *node, const uint32_t *palette,
|
|
const enum color_search_method search_method)
|
|
{
|
|
int r, g, b, ret = 0;
|
|
|
|
for (r = 0; r < 256; r++) {
|
|
for (g = 0; g < 256; g++) {
|
|
for (b = 0; b < 256; b++) {
|
|
const uint8_t rgb[] = {r, g, b};
|
|
const int r1 = COLORMAP_NEAREST(search_method, palette, node, rgb);
|
|
const int r2 = colormap_nearest_bruteforce(palette, rgb);
|
|
if (r1 != r2) {
|
|
const uint32_t c1 = palette[r1];
|
|
const uint32_t c2 = palette[r2];
|
|
const uint8_t palrgb1[] = { c1>>16 & 0xff, c1>> 8 & 0xff, c1 & 0xff };
|
|
const uint8_t palrgb2[] = { c2>>16 & 0xff, c2>> 8 & 0xff, c2 & 0xff };
|
|
const int d1 = diff(palrgb1, rgb);
|
|
const int d2 = diff(palrgb2, rgb);
|
|
if (d1 != d2) {
|
|
av_log(NULL, AV_LOG_ERROR,
|
|
"/!\\ %02X%02X%02X: %d ! %d (%06X ! %06X) / dist: %d ! %d\n",
|
|
r, g, b, r1, r2, c1 & 0xffffff, c2 & 0xffffff, d1, d2);
|
|
ret = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
struct color {
|
|
uint32_t value;
|
|
uint8_t pal_id;
|
|
};
|
|
|
|
struct color_rect {
|
|
uint8_t min[3];
|
|
uint8_t max[3];
|
|
};
|
|
|
|
typedef int (*cmp_func)(const void *, const void *);
|
|
|
|
#define DECLARE_CMP_FUNC(name, pos) \
|
|
static int cmp_##name(const void *pa, const void *pb) \
|
|
{ \
|
|
const struct color *a = pa; \
|
|
const struct color *b = pb; \
|
|
return (a->value >> (8 * (2 - (pos))) & 0xff) \
|
|
- (b->value >> (8 * (2 - (pos))) & 0xff); \
|
|
}
|
|
|
|
DECLARE_CMP_FUNC(r, 0)
|
|
DECLARE_CMP_FUNC(g, 1)
|
|
DECLARE_CMP_FUNC(b, 2)
|
|
|
|
static const cmp_func cmp_funcs[] = {cmp_r, cmp_g, cmp_b};
|
|
|
|
static int get_next_color(const uint8_t *color_used, const uint32_t *palette,
|
|
int *component, const struct color_rect *box)
|
|
{
|
|
int wr, wg, wb;
|
|
int i, longest = 0;
|
|
unsigned nb_color = 0;
|
|
struct color_rect ranges;
|
|
struct color tmp_pal[256];
|
|
cmp_func cmpf;
|
|
|
|
ranges.min[0] = ranges.min[1] = ranges.min[2] = 0xff;
|
|
ranges.max[0] = ranges.max[1] = ranges.max[2] = 0x00;
|
|
|
|
for (i = 0; i < AVPALETTE_COUNT; i++) {
|
|
const uint32_t c = palette[i];
|
|
const uint8_t r = c >> 16 & 0xff;
|
|
const uint8_t g = c >> 8 & 0xff;
|
|
const uint8_t b = c & 0xff;
|
|
|
|
if (color_used[i] ||
|
|
r < box->min[0] || g < box->min[1] || b < box->min[2] ||
|
|
r > box->max[0] || g > box->max[1] || b > box->max[2])
|
|
continue;
|
|
|
|
if (r < ranges.min[0]) ranges.min[0] = r;
|
|
if (g < ranges.min[1]) ranges.min[1] = g;
|
|
if (b < ranges.min[2]) ranges.min[2] = b;
|
|
|
|
if (r > ranges.max[0]) ranges.max[0] = r;
|
|
if (g > ranges.max[1]) ranges.max[1] = g;
|
|
if (b > ranges.max[2]) ranges.max[2] = b;
|
|
|
|
tmp_pal[nb_color].value = c;
|
|
tmp_pal[nb_color].pal_id = i;
|
|
|
|
nb_color++;
|
|
}
|
|
|
|
if (!nb_color)
|
|
return -1;
|
|
|
|
/* define longest axis that will be the split component */
|
|
wr = ranges.max[0] - ranges.min[0];
|
|
wg = ranges.max[1] - ranges.min[1];
|
|
wb = ranges.max[2] - ranges.min[2];
|
|
if (wr >= wg && wr >= wb) longest = 0;
|
|
if (wg >= wr && wg >= wb) longest = 1;
|
|
if (wb >= wr && wb >= wg) longest = 2;
|
|
cmpf = cmp_funcs[longest];
|
|
*component = longest;
|
|
|
|
/* sort along this axis to get median */
|
|
AV_QSORT(tmp_pal, nb_color, struct color, cmpf);
|
|
|
|
return tmp_pal[nb_color >> 1].pal_id;
|
|
}
|
|
|
|
static int colormap_insert(struct color_node *map,
|
|
uint8_t *color_used,
|
|
int *nb_used,
|
|
const uint32_t *palette,
|
|
const struct color_rect *box)
|
|
{
|
|
uint32_t c;
|
|
int component, cur_id;
|
|
int node_left_id = -1, node_right_id = -1;
|
|
struct color_node *node;
|
|
struct color_rect box1, box2;
|
|
const int pal_id = get_next_color(color_used, palette, &component, box);
|
|
|
|
if (pal_id < 0)
|
|
return -1;
|
|
|
|
/* create new node with that color */
|
|
cur_id = (*nb_used)++;
|
|
c = palette[pal_id];
|
|
node = &map[cur_id];
|
|
node->split = component;
|
|
node->palette_id = pal_id;
|
|
node->val[0] = c>>16 & 0xff;
|
|
node->val[1] = c>> 8 & 0xff;
|
|
node->val[2] = c & 0xff;
|
|
|
|
color_used[pal_id] = 1;
|
|
|
|
/* get the two boxes this node creates */
|
|
box1 = box2 = *box;
|
|
box1.max[component] = node->val[component];
|
|
box2.min[component] = node->val[component] + 1;
|
|
|
|
node_left_id = colormap_insert(map, color_used, nb_used, palette, &box1);
|
|
|
|
if (box2.min[component] <= box2.max[component])
|
|
node_right_id = colormap_insert(map, color_used, nb_used, palette, &box2);
|
|
|
|
node->left_id = node_left_id;
|
|
node->right_id = node_right_id;
|
|
|
|
return cur_id;
|
|
}
|
|
|
|
static int cmp_pal_entry(const void *a, const void *b)
|
|
{
|
|
const int c1 = *(const uint32_t *)a & 0xffffff;
|
|
const int c2 = *(const uint32_t *)b & 0xffffff;
|
|
return c1 - c2;
|
|
}
|
|
|
|
static void load_colormap(PaletteUseContext *s)
|
|
{
|
|
int i, nb_used = 0;
|
|
uint8_t color_used[AVPALETTE_COUNT] = {0};
|
|
uint32_t last_color = 0;
|
|
struct color_rect box;
|
|
|
|
/* disable transparent colors and dups */
|
|
qsort(s->palette, AVPALETTE_COUNT, sizeof(*s->palette), cmp_pal_entry);
|
|
for (i = 0; i < AVPALETTE_COUNT; i++) {
|
|
const uint32_t c = s->palette[i];
|
|
if (i != 0 && c == last_color) {
|
|
color_used[i] = 1;
|
|
continue;
|
|
}
|
|
last_color = c;
|
|
if ((c & 0xff000000) != 0xff000000) {
|
|
color_used[i] = 1; // ignore transparent color(s)
|
|
continue;
|
|
}
|
|
}
|
|
|
|
box.min[0] = box.min[1] = box.min[2] = 0x00;
|
|
box.max[0] = box.max[1] = box.max[2] = 0xff;
|
|
|
|
colormap_insert(s->map, color_used, &nb_used, s->palette, &box);
|
|
|
|
if (s->dot_filename)
|
|
disp_tree(s->map, s->dot_filename);
|
|
|
|
if (s->debug_accuracy) {
|
|
if (!debug_accuracy(s->map, s->palette, s->color_search_method))
|
|
av_log(NULL, AV_LOG_INFO, "Accuracy check passed\n");
|
|
}
|
|
}
|
|
|
|
static void debug_mean_error(PaletteUseContext *s, const AVFrame *in1,
|
|
const AVFrame *in2, int frame_count)
|
|
{
|
|
int x, y;
|
|
const uint32_t *palette = s->palette;
|
|
uint32_t *src1 = (uint32_t *)in1->data[0];
|
|
uint8_t *src2 = in2->data[0];
|
|
const int src1_linesize = in1->linesize[0] >> 2;
|
|
const int src2_linesize = in2->linesize[0];
|
|
const float div = in1->width * in1->height * 3;
|
|
unsigned mean_err = 0;
|
|
|
|
for (y = 0; y < in1->height; y++) {
|
|
for (x = 0; x < in1->width; x++) {
|
|
const uint32_t c1 = src1[x];
|
|
const uint32_t c2 = palette[src2[x]];
|
|
const uint8_t rgb1[] = {c1 >> 16 & 0xff, c1 >> 8 & 0xff, c1 & 0xff};
|
|
const uint8_t rgb2[] = {c2 >> 16 & 0xff, c2 >> 8 & 0xff, c2 & 0xff};
|
|
mean_err += diff(rgb1, rgb2);
|
|
}
|
|
src1 += src1_linesize;
|
|
src2 += src2_linesize;
|
|
}
|
|
|
|
s->total_mean_err += mean_err;
|
|
|
|
av_log(NULL, AV_LOG_INFO, "MEP:%.3f TotalMEP:%.3f\n",
|
|
mean_err / div, s->total_mean_err / (div * frame_count));
|
|
}
|
|
|
|
static void set_processing_window(enum diff_mode diff_mode,
|
|
const AVFrame *prv_src, const AVFrame *cur_src,
|
|
const AVFrame *prv_dst, AVFrame *cur_dst,
|
|
int *xp, int *yp, int *wp, int *hp)
|
|
{
|
|
int x_start = 0, y_start = 0;
|
|
int width = cur_src->width;
|
|
int height = cur_src->height;
|
|
|
|
if (prv_src && diff_mode == DIFF_MODE_RECTANGLE) {
|
|
int y;
|
|
int x_end = cur_src->width - 1,
|
|
y_end = cur_src->height - 1;
|
|
const uint32_t *prv_srcp = (const uint32_t *)prv_src->data[0];
|
|
const uint32_t *cur_srcp = (const uint32_t *)cur_src->data[0];
|
|
const uint8_t *prv_dstp = prv_dst->data[0];
|
|
uint8_t *cur_dstp = cur_dst->data[0];
|
|
|
|
const int prv_src_linesize = prv_src->linesize[0] >> 2;
|
|
const int cur_src_linesize = cur_src->linesize[0] >> 2;
|
|
const int prv_dst_linesize = prv_dst->linesize[0];
|
|
const int cur_dst_linesize = cur_dst->linesize[0];
|
|
|
|
/* skip common lines */
|
|
while (y_start < y_end && !memcmp(prv_srcp + y_start*prv_src_linesize,
|
|
cur_srcp + y_start*cur_src_linesize,
|
|
cur_src->width * 4)) {
|
|
memcpy(cur_dstp + y_start*cur_dst_linesize,
|
|
prv_dstp + y_start*prv_dst_linesize,
|
|
cur_dst->width);
|
|
y_start++;
|
|
}
|
|
while (y_end > y_start && !memcmp(prv_srcp + y_end*prv_src_linesize,
|
|
cur_srcp + y_end*cur_src_linesize,
|
|
cur_src->width * 4)) {
|
|
memcpy(cur_dstp + y_end*cur_dst_linesize,
|
|
prv_dstp + y_end*prv_dst_linesize,
|
|
cur_dst->width);
|
|
y_end--;
|
|
}
|
|
|
|
height = y_end + 1 - y_start;
|
|
|
|
/* skip common columns */
|
|
while (x_start < x_end) {
|
|
int same_column = 1;
|
|
for (y = y_start; y <= y_end; y++) {
|
|
if (prv_srcp[y*prv_src_linesize + x_start] != cur_srcp[y*cur_src_linesize + x_start]) {
|
|
same_column = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (!same_column)
|
|
break;
|
|
x_start++;
|
|
}
|
|
while (x_end > x_start) {
|
|
int same_column = 1;
|
|
for (y = y_start; y <= y_end; y++) {
|
|
if (prv_srcp[y*prv_src_linesize + x_end] != cur_srcp[y*cur_src_linesize + x_end]) {
|
|
same_column = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (!same_column)
|
|
break;
|
|
x_end--;
|
|
}
|
|
width = x_end + 1 - x_start;
|
|
|
|
if (x_start) {
|
|
for (y = y_start; y <= y_end; y++)
|
|
memcpy(cur_dstp + y*cur_dst_linesize,
|
|
prv_dstp + y*prv_dst_linesize, x_start);
|
|
}
|
|
if (x_end != cur_src->width - 1) {
|
|
const int copy_len = cur_src->width - 1 - x_end;
|
|
for (y = y_start; y <= y_end; y++)
|
|
memcpy(cur_dstp + y*cur_dst_linesize + x_end + 1,
|
|
prv_dstp + y*prv_dst_linesize + x_end + 1,
|
|
copy_len);
|
|
}
|
|
}
|
|
*xp = x_start;
|
|
*yp = y_start;
|
|
*wp = width;
|
|
*hp = height;
|
|
}
|
|
|
|
static AVFrame *apply_palette(AVFilterLink *inlink, AVFrame *in)
|
|
{
|
|
int x, y, w, h;
|
|
AVFilterContext *ctx = inlink->dst;
|
|
PaletteUseContext *s = ctx->priv;
|
|
AVFilterLink *outlink = inlink->dst->outputs[0];
|
|
|
|
AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
|
|
if (!out) {
|
|
av_frame_free(&in);
|
|
return NULL;
|
|
}
|
|
av_frame_copy_props(out, in);
|
|
|
|
set_processing_window(s->diff_mode, s->last_in, in,
|
|
s->last_out, out, &x, &y, &w, &h);
|
|
av_frame_free(&s->last_in);
|
|
av_frame_free(&s->last_out);
|
|
s->last_in = av_frame_clone(in);
|
|
s->last_out = av_frame_clone(out);
|
|
if (!s->last_in || !s->last_out ||
|
|
av_frame_make_writable(s->last_in) < 0) {
|
|
av_frame_free(&in);
|
|
av_frame_free(&out);
|
|
return NULL;
|
|
}
|
|
|
|
ff_dlog(ctx, "%dx%d rect: (%d;%d) -> (%d,%d) [area:%dx%d]\n",
|
|
w, h, x, y, x+w, y+h, in->width, in->height);
|
|
|
|
if (s->set_frame(s, out, in, x, y, w, h) < 0) {
|
|
av_frame_free(&out);
|
|
return NULL;
|
|
}
|
|
memcpy(out->data[1], s->palette, AVPALETTE_SIZE);
|
|
if (s->calc_mean_err)
|
|
debug_mean_error(s, in, out, inlink->frame_count);
|
|
av_frame_free(&in);
|
|
return out;
|
|
}
|
|
|
|
static int config_output(AVFilterLink *outlink)
|
|
{
|
|
int ret;
|
|
AVFilterContext *ctx = outlink->src;
|
|
PaletteUseContext *s = ctx->priv;
|
|
|
|
outlink->w = ctx->inputs[0]->w;
|
|
outlink->h = ctx->inputs[0]->h;
|
|
|
|
outlink->time_base = ctx->inputs[0]->time_base;
|
|
if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
static int config_input_palette(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
|
|
if (inlink->w * inlink->h != AVPALETTE_COUNT) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Palette input must contain exactly %d pixels. "
|
|
"Specified input has %dx%d=%d pixels\n",
|
|
AVPALETTE_COUNT, inlink->w, inlink->h,
|
|
inlink->w * inlink->h);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void load_palette(PaletteUseContext *s, const AVFrame *palette_frame)
|
|
{
|
|
int i, x, y;
|
|
const uint32_t *p = (const uint32_t *)palette_frame->data[0];
|
|
const int p_linesize = palette_frame->linesize[0] >> 2;
|
|
|
|
if (s->new) {
|
|
memset(s->palette, 0, sizeof(s->palette));
|
|
memset(s->map, 0, sizeof(s->map));
|
|
for (i = 0; i < CACHE_SIZE; i++)
|
|
av_freep(&s->cache[i].entries);
|
|
memset(s->cache, 0, sizeof(s->cache));
|
|
}
|
|
|
|
i = 0;
|
|
for (y = 0; y < palette_frame->height; y++) {
|
|
for (x = 0; x < palette_frame->width; x++)
|
|
s->palette[i++] = p[x];
|
|
p += p_linesize;
|
|
}
|
|
|
|
load_colormap(s);
|
|
|
|
if (!s->new)
|
|
s->palette_loaded = 1;
|
|
}
|
|
|
|
static AVFrame *load_apply_palette(AVFilterContext *ctx, AVFrame *main,
|
|
const AVFrame *second)
|
|
{
|
|
AVFilterLink *inlink = ctx->inputs[0];
|
|
PaletteUseContext *s = ctx->priv;
|
|
if (!s->palette_loaded) {
|
|
load_palette(s, second);
|
|
}
|
|
return apply_palette(inlink, main);
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
|
{
|
|
PaletteUseContext *s = inlink->dst->priv;
|
|
return ff_dualinput_filter_frame(&s->dinput, inlink, in);
|
|
}
|
|
|
|
#define DEFINE_SET_FRAME(color_search, name, value) \
|
|
static int set_frame_##name(PaletteUseContext *s, AVFrame *out, AVFrame *in, \
|
|
int x_start, int y_start, int w, int h) \
|
|
{ \
|
|
return set_frame(s, out, in, x_start, y_start, w, h, value, color_search); \
|
|
}
|
|
|
|
#define DEFINE_SET_FRAME_COLOR_SEARCH(color_search, color_search_macro) \
|
|
DEFINE_SET_FRAME(color_search_macro, color_search##_##none, DITHERING_NONE) \
|
|
DEFINE_SET_FRAME(color_search_macro, color_search##_##bayer, DITHERING_BAYER) \
|
|
DEFINE_SET_FRAME(color_search_macro, color_search##_##heckbert, DITHERING_HECKBERT) \
|
|
DEFINE_SET_FRAME(color_search_macro, color_search##_##floyd_steinberg, DITHERING_FLOYD_STEINBERG) \
|
|
DEFINE_SET_FRAME(color_search_macro, color_search##_##sierra2, DITHERING_SIERRA2) \
|
|
DEFINE_SET_FRAME(color_search_macro, color_search##_##sierra2_4a, DITHERING_SIERRA2_4A) \
|
|
|
|
DEFINE_SET_FRAME_COLOR_SEARCH(nns_iterative, COLOR_SEARCH_NNS_ITERATIVE)
|
|
DEFINE_SET_FRAME_COLOR_SEARCH(nns_recursive, COLOR_SEARCH_NNS_RECURSIVE)
|
|
DEFINE_SET_FRAME_COLOR_SEARCH(bruteforce, COLOR_SEARCH_BRUTEFORCE)
|
|
|
|
#define DITHERING_ENTRIES(color_search) { \
|
|
set_frame_##color_search##_none, \
|
|
set_frame_##color_search##_bayer, \
|
|
set_frame_##color_search##_heckbert, \
|
|
set_frame_##color_search##_floyd_steinberg, \
|
|
set_frame_##color_search##_sierra2, \
|
|
set_frame_##color_search##_sierra2_4a, \
|
|
}
|
|
|
|
static const set_frame_func set_frame_lut[NB_COLOR_SEARCHES][NB_DITHERING] = {
|
|
DITHERING_ENTRIES(nns_iterative),
|
|
DITHERING_ENTRIES(nns_recursive),
|
|
DITHERING_ENTRIES(bruteforce),
|
|
};
|
|
|
|
static int dither_value(int p)
|
|
{
|
|
const int q = p ^ (p >> 3);
|
|
return (p & 4) >> 2 | (q & 4) >> 1 \
|
|
| (p & 2) << 1 | (q & 2) << 2 \
|
|
| (p & 1) << 4 | (q & 1) << 5;
|
|
}
|
|
|
|
static av_cold int init(AVFilterContext *ctx)
|
|
{
|
|
PaletteUseContext *s = ctx->priv;
|
|
s->dinput.repeatlast = 1; // only 1 frame in the palette
|
|
s->dinput.skip_initial_unpaired = 1;
|
|
s->dinput.process = load_apply_palette;
|
|
|
|
s->set_frame = set_frame_lut[s->color_search_method][s->dither];
|
|
|
|
if (s->dither == DITHERING_BAYER) {
|
|
int i;
|
|
const int delta = 1 << (5 - s->bayer_scale); // to avoid too much luma
|
|
|
|
for (i = 0; i < FF_ARRAY_ELEMS(s->ordered_dither); i++)
|
|
s->ordered_dither[i] = (dither_value(i) >> s->bayer_scale) - delta;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int request_frame(AVFilterLink *outlink)
|
|
{
|
|
PaletteUseContext *s = outlink->src->priv;
|
|
return ff_dualinput_request_frame(&s->dinput, outlink);
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
int i;
|
|
PaletteUseContext *s = ctx->priv;
|
|
|
|
ff_dualinput_uninit(&s->dinput);
|
|
for (i = 0; i < CACHE_SIZE; i++)
|
|
av_freep(&s->cache[i].entries);
|
|
av_frame_free(&s->last_in);
|
|
av_frame_free(&s->last_out);
|
|
}
|
|
|
|
static const AVFilterPad paletteuse_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.filter_frame = filter_frame,
|
|
.needs_writable = 1, // for error diffusal dithering
|
|
},{
|
|
.name = "palette",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_input_palette,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad paletteuse_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
.request_frame = request_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_vf_paletteuse = {
|
|
.name = "paletteuse",
|
|
.description = NULL_IF_CONFIG_SMALL("Use a palette to downsample an input video stream."),
|
|
.priv_size = sizeof(PaletteUseContext),
|
|
.query_formats = query_formats,
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.inputs = paletteuse_inputs,
|
|
.outputs = paletteuse_outputs,
|
|
.priv_class = &paletteuse_class,
|
|
};
|