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avfilter/paletteuse: remove alternative search methods

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This is a maintenance pain more than anything. It appears to make the
code slightly faster as a side effect.
This commit is contained in:
Clément Bœsch 2022-12-27 18:03:46 +01:00
parent 0f7942afa6
commit 8789a9e05b
1 changed files with 28 additions and 187 deletions
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215
libavfilter/vf_paletteuse.c
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@ -45,13 +45,6 @@ enum dithering_mode {
NB_DITHERING
};
enum color_search_method {
COLOR_SEARCH_NNS_ITERATIVE,
COLOR_SEARCH_NNS_RECURSIVE,
COLOR_SEARCH_BRUTEFORCE,
NB_COLOR_SEARCHES
};
enum diff_mode {
DIFF_MODE_NONE,
DIFF_MODE_RECTANGLE,
@ -107,10 +100,8 @@ typedef struct PaletteUseContext {
/* debug options */
char *dot_filename;
int color_search_method;
int calc_mean_err;
uint64_t total_mean_err;
int debug_accuracy;
} PaletteUseContext;
#define OFFSET(x) offsetof(PaletteUseContext, x)
@ -130,12 +121,7 @@ static const AVOption paletteuse_options[] = {
/* following are the debug options, not part of the official API */
{ "debug_kdtree", "save Graphviz graph of the kdtree in specified file", OFFSET(dot_filename), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "color_search", "set reverse colormap color search method", OFFSET(color_search_method), AV_OPT_TYPE_INT, {.i64=COLOR_SEARCH_NNS_RECURSIVE}, 0, NB_COLOR_SEARCHES-1, FLAGS, "search" },
{ "nns_iterative", "iterative search", 0, AV_OPT_TYPE_CONST, {.i64=COLOR_SEARCH_NNS_ITERATIVE}, INT_MIN, INT_MAX, FLAGS, "search" },
{ "nns_recursive", "recursive search", 0, AV_OPT_TYPE_CONST, {.i64=COLOR_SEARCH_NNS_RECURSIVE}, INT_MIN, INT_MAX, FLAGS, "search" },
{ "bruteforce", "brute-force into the palette", 0, AV_OPT_TYPE_CONST, {.i64=COLOR_SEARCH_BRUTEFORCE}, INT_MIN, INT_MAX, FLAGS, "search" },
{ "mean_err", "compute and print mean error", OFFSET(calc_mean_err), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "debug_accuracy", "test color search accuracy", OFFSET(debug_accuracy), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ NULL }
};
@ -193,26 +179,6 @@ static struct color_info get_color_from_srgb(uint32_t srgb)
return ret;
}
static av_always_inline uint8_t colormap_nearest_bruteforce(const uint32_t *palette, const struct color_info *target, const int trans_thresh)
{
int i, pal_id = -1, min_dist = INT_MAX;
for (i = 0; i < AVPALETTE_COUNT; i++) {
const uint32_t c = palette[i];
if (c >> 24 >= trans_thresh) { // ignore transparent entry
const struct color_info pal_color = get_color_from_srgb(palette[i]);
const int d = diff(&pal_color, target, trans_thresh);
if (d < min_dist) {
pal_id = i;
min_dist = d;
}
}
}
return pal_id;
}
/* Recursive form, simpler but a bit slower. Kept for reference. */
struct nearest_color {
int node_pos;
int64_t dist_sqd;
@ -248,7 +214,7 @@ static void colormap_nearest_node(const struct color_node *map,
}
}
static av_always_inline uint8_t colormap_nearest_recursive(const struct color_node *node, const struct color_info *target, const int trans_thresh)
static av_always_inline uint8_t colormap_nearest(const struct color_node *node, const struct color_info *target, const int trans_thresh)
{
struct nearest_color res = {.dist_sqd = INT_MAX, .node_pos = -1};
colormap_nearest_node(node, 0, target, trans_thresh, &res);
@ -260,89 +226,11 @@ struct stack_node {
int dx2;
};
static av_always_inline uint8_t colormap_nearest_iterative(const struct color_node *root, const struct color_info *target, const int trans_thresh)
{
int pos = 0, best_node_id = -1, cur_color_id = 0;
int64_t best_dist = INT_MAX;
struct stack_node nodes[16];
struct stack_node *node = &nodes[0];
for (;;) {
const struct color_node *kd = &root[cur_color_id];
const struct color_info *current = &kd->c;
const int64_t current_to_target = diff(target, current, trans_thresh);
/* Compare current color node to the target and update our best node if
* it's actually better. */
if (current_to_target < best_dist) {
best_node_id = cur_color_id;
if (!current_to_target)
goto end; // exact match, we can return immediately
best_dist = current_to_target;
}
/* Check if it's not a leaf */
if (kd->left_id != -1 || kd->right_id != -1) {
const int64_t dx = target->lab[kd->split] - current->lab[kd->split];
int nearer_kd_id, further_kd_id;
/* Define which side is the most interesting. */
if (dx <= 0) nearer_kd_id = kd->left_id, further_kd_id = kd->right_id;
else nearer_kd_id = kd->right_id, further_kd_id = kd->left_id;
if (nearer_kd_id != -1) {
if (further_kd_id != -1) {
/* Here, both paths are defined, so we push a state for
* when we are going back. */
node->color_id = further_kd_id;
node->dx2 = dx*dx;
pos++;
node++;
}
/* We can now update current color with the most probable path
* (no need to create a state since there is nothing to save
* anymore). */
cur_color_id = nearer_kd_id;
continue;
} else if (dx*dx < best_dist) {
/* The nearest path isn't available, so there is only one path
* possible and it's the least probable. We enter it only if the
* distance from the current point to the hyper rectangle is
* less than our best distance. */
cur_color_id = further_kd_id;
continue;
}
}
/* Unstack as much as we can, typically as long as the least probable
* branch aren't actually probable. */
do {
if (--pos < 0)
goto end;
node--;
} while (node->dx2 >= best_dist);
/* We got a node where the least probable branch might actually contain
* a relevant color. */
cur_color_id = node->color_id;
}
end:
return root[best_node_id].palette_id;
}
#define COLORMAP_NEAREST(search, palette, root, target, trans_thresh) \
search == COLOR_SEARCH_NNS_ITERATIVE ? colormap_nearest_iterative(root, target, trans_thresh) : \
search == COLOR_SEARCH_NNS_RECURSIVE ? colormap_nearest_recursive(root, target, trans_thresh) : \
colormap_nearest_bruteforce(palette, target, trans_thresh)
/**
* Check if the requested color is in the cache already. If not, find it in the
* color tree and cache it.
*/
static av_always_inline int color_get(PaletteUseContext *s, uint32_t color,
const enum color_search_method search_method)
static av_always_inline int color_get(PaletteUseContext *s, uint32_t color)
{
int i;
struct color_info clrinfo;
@ -367,20 +255,19 @@ static av_always_inline int color_get(PaletteUseContext *s, uint32_t color,
return AVERROR(ENOMEM);
e->color = color;
clrinfo = get_color_from_srgb(color);
e->pal_entry = COLORMAP_NEAREST(search_method, s->palette, s->map, &clrinfo, s->trans_thresh);
e->pal_entry = colormap_nearest(s->map, &clrinfo, s->trans_thresh);
return e->pal_entry;
}
static av_always_inline int get_dst_color_err(PaletteUseContext *s,
uint32_t c, int *er, int *eg, int *eb,
const enum color_search_method search_method)
uint32_t c, int *er, int *eg, int *eb)
{
const uint8_t r = c >> 16 & 0xff;
const uint8_t g = c >> 8 & 0xff;
const uint8_t b = c & 0xff;
uint32_t dstc;
const int dstx = color_get(s, c, search_method);
const int dstx = color_get(s, c);
if (dstx < 0)
return dstx;
dstc = s->palette[dstx];
@ -396,8 +283,7 @@ static av_always_inline int get_dst_color_err(PaletteUseContext *s,
static av_always_inline int set_frame(PaletteUseContext *s, AVFrame *out, AVFrame *in,
int x_start, int y_start, int w, int h,
enum dithering_mode dither,
const enum color_search_method search_method)
enum dithering_mode dither)
{
int x, y;
const int src_linesize = in ->linesize[0] >> 2;
@ -422,7 +308,7 @@ static av_always_inline int set_frame(PaletteUseContext *s, AVFrame *out, AVFram
const uint8_t g = av_clip_uint8(g8 + d);
const uint8_t b = av_clip_uint8(b8 + d);
const uint32_t color_new = (unsigned)(a8) << 24 | r << 16 | g << 8 | b;
const int color = color_get(s, color_new, search_method);
const int color = color_get(s, color_new);
if (color < 0)
return color;
@ -430,7 +316,7 @@ static av_always_inline int set_frame(PaletteUseContext *s, AVFrame *out, AVFram
} else if (dither == DITHERING_HECKBERT) {
const int right = x < w - 1, down = y < h - 1;
const int color = get_dst_color_err(s, src[x], &er, &eg, &eb, search_method);
const int color = get_dst_color_err(s, src[x], &er, &eg, &eb);
if (color < 0)
return color;
@ -442,7 +328,7 @@ static av_always_inline int set_frame(PaletteUseContext *s, AVFrame *out, AVFram
} 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(s, src[x], &er, &eg, &eb, search_method);
const int color = get_dst_color_err(s, src[x], &er, &eg, &eb);
if (color < 0)
return color;
@ -456,7 +342,7 @@ static av_always_inline int set_frame(PaletteUseContext *s, AVFrame *out, AVFram
} 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(s, src[x], &er, &eg, &eb, search_method);
const int color = get_dst_color_err(s, src[x], &er, &eg, &eb);
if (color < 0)
return color;
@ -475,7 +361,7 @@ static av_always_inline int set_frame(PaletteUseContext *s, AVFrame *out, AVFram
} 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(s, src[x], &er, &eg, &eb, search_method);
const int color = get_dst_color_err(s, src[x], &er, &eg, &eb);
if (color < 0)
return color;
@ -486,7 +372,7 @@ static av_always_inline int set_frame(PaletteUseContext *s, AVFrame *out, AVFram
if ( down) src[src_linesize + x ] = dither_color(src[src_linesize + x ], er, eg, eb, 1, 2);
} else {
const int color = color_get(s, src[x], search_method);
const int color = color_get(s, src[x]);
if (color < 0)
return color;
@ -552,35 +438,6 @@ static int disp_tree(const struct color_node *node, const char *fname)
return 0;
}
static int debug_accuracy(const struct color_node *node, const uint32_t *palette, const int trans_thresh,
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 struct color_info target = get_color_from_srgb(0xff000000 | r<<16 | g<<8 | b);
const int r1 = COLORMAP_NEAREST(search_method, palette, node, &target, trans_thresh);
const int r2 = colormap_nearest_bruteforce(palette, &target, trans_thresh);
if (r1 != r2) {
const struct color_info pal_c1 = get_color_from_srgb(0xff000000 | palette[r1]);
const struct color_info pal_c2 = get_color_from_srgb(0xff000000 | palette[r2]);
const int d1 = diff(&pal_c1, &target, trans_thresh);
const int d2 = diff(&pal_c2, &target, trans_thresh);
if (d1 != d2) {
av_log(NULL, AV_LOG_ERROR,
"/!\\ %02X%02X%02X: %d ! %d (%06"PRIX32" ! %06"PRIX32") / dist: %d ! %d\n",
r, g, b, r1, r2, pal_c1.srgb & 0xffffff, pal_c2.srgb & 0xffffff, d1, d2);
ret = 1;
}
}
}
}
}
return ret;
}
struct color {
struct Lab value;
uint8_t pal_id;
@ -747,11 +604,6 @@ static void load_colormap(PaletteUseContext *s)
if (s->dot_filename)
disp_tree(s->map, s->dot_filename);
if (s->debug_accuracy) {
if (!debug_accuracy(s->map, s->palette, s->trans_thresh, s->color_search_method))
av_log(NULL, AV_LOG_INFO, "Accuracy check passed\n");
}
}
static void debug_mean_error(PaletteUseContext *s, const AVFrame *in1,
@ -1010,38 +862,27 @@ static int load_apply_palette(FFFrameSync *fs)
return ff_filter_frame(ctx->outputs[0], out);
}
#define DEFINE_SET_FRAME(color_search, name, value) \
#define DEFINE_SET_FRAME(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); \
return set_frame(s, out, in, x_start, y_start, w, h, value); \
}
#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(none, DITHERING_NONE)
DEFINE_SET_FRAME(bayer, DITHERING_BAYER)
DEFINE_SET_FRAME(heckbert, DITHERING_HECKBERT)
DEFINE_SET_FRAME(floyd_steinberg, DITHERING_FLOYD_STEINBERG)
DEFINE_SET_FRAME(sierra2, DITHERING_SIERRA2)
DEFINE_SET_FRAME(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 const set_frame_func set_frame_lut[NB_DITHERING] = {
set_frame_none,
set_frame_bayer,
set_frame_heckbert,
set_frame_floyd_steinberg,
set_frame_sierra2,
set_frame_sierra2_4a,
};
static int dither_value(int p)
@ -1061,7 +902,7 @@ static av_cold int init(AVFilterContext *ctx)
if (!s->last_in || !s->last_out)
return AVERROR(ENOMEM);
s->set_frame = set_frame_lut[s->color_search_method][s->dither];
s->set_frame = set_frame_lut[s->dither];
if (s->dither == DITHERING_BAYER) {
int i;