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avfilter/vf_colorkey: add >8 depth support

This commit is contained in:
Paul B Mahol 2022-04-07 11:32:05 +02:00
parent 9d20f64f9c
commit c3f5f1bc56
1 changed files with 106 additions and 84 deletions
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192
libavfilter/vf_colorkey.c
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@ -23,6 +23,7 @@
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
@ -31,105 +32,120 @@ typedef struct ColorkeyContext {
const AVClass *class;
/* color offsets rgba */
int co[4];
uint8_t co[4];
uint8_t colorkey_rgba[4];
float similarity;
float blend;
double scale;
int depth;
int max;
int (*do_slice)(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs);
} ColorkeyContext;
static uint8_t do_colorkey_pixel(ColorkeyContext *ctx, uint8_t r, uint8_t g, uint8_t b)
static int do_colorkey_pixel(const uint8_t *colorkey_rgba, int r, int g, int b,
float similarity, float blend, int max, double scale)
{
int dr = (int)r - ctx->colorkey_rgba[0];
int dg = (int)g - ctx->colorkey_rgba[1];
int db = (int)b - ctx->colorkey_rgba[2];
double dr, dg, db, diff;
double diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0 * 3.0));
dr = r * scale - colorkey_rgba[0];
dg = g * scale - colorkey_rgba[1];
db = b * scale - colorkey_rgba[2];
if (ctx->blend > 0.0001) {
return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
diff = sqrt((dr * dr + dg * dg + db * db) / (255.0 * 255.0 * 3.0));
if (blend > 0.0001) {
return av_clipd((diff - similarity) / blend, 0.0, 1.0) * max;
} else {
return (diff > ctx->similarity) ? 255 : 0;
return (diff > similarity) ? max : 0;
}
}
static int do_colorkey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
AVFrame *frame = arg;
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
ColorkeyContext *ctx = avctx->priv;
int o, x, y;
for (y = slice_start; y < slice_end; ++y) {
for (x = 0; x < frame->width; ++x) {
o = frame->linesize[0] * y + x * 4;
frame->data[0][o + ctx->co[3]] =
do_colorkey_pixel(ctx,
frame->data[0][o + ctx->co[0]],
frame->data[0][o + ctx->co[1]],
frame->data[0][o + ctx->co[2]]);
}
#define COLORKEY_SLICE(name, type) \
static int do_colorkey_slice##name(AVFilterContext *avctx, \
void *arg, \
int jobnr, int nb_jobs) \
{ \
AVFrame *frame = arg; \
const int slice_start = (frame->height * jobnr) / nb_jobs; \
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; \
ColorkeyContext *ctx = avctx->priv; \
const float similarity = ctx->similarity; \
const float blend = ctx->blend; \
const uint8_t *colorkey_rgba = ctx->colorkey_rgba; \
const uint8_t *co = ctx->co; \
const double scale = ctx->scale; \
const int max = ctx->max; \
\
for (int y = slice_start; y < slice_end; y++) { \
type *dst = (type *)(frame->data[0] + y * frame->linesize[0]);\
\
for (int x = 0; x < frame->width; x++) { \
const int o = x * 4; \
\
dst[o + co[3]] = do_colorkey_pixel(colorkey_rgba, \
dst[o + co[0]], \
dst[o + co[1]], \
dst[o + co[2]], \
similarity, blend, max, scale); \
} \
} \
\
return 0; \
}
return 0;
COLORKEY_SLICE(8, uint8_t)
COLORKEY_SLICE(16, uint16_t)
#define COLORHOLD_SLICE(name, type, htype) \
static int do_colorhold_slice##name(AVFilterContext *avctx, void *arg, \
int jobnr, int nb_jobs) \
{ \
AVFrame *frame = arg; \
const int slice_start = (frame->height * jobnr) / nb_jobs; \
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; \
ColorkeyContext *ctx = avctx->priv; \
const int depth = ctx->depth; \
const int max = ctx->max; \
const int half = max / 2; \
const uint8_t *co = ctx->co; \
const uint8_t *colorkey_rgba = ctx->colorkey_rgba; \
const float similarity = ctx->similarity; \
const float blend = ctx->blend; \
const double scale = ctx->scale; \
\
for (int y = slice_start; y < slice_end; ++y) { \
type *dst = (type *)(frame->data[0] + y * frame->linesize[0]); \
\
for (int x = 0; x < frame->width; ++x) { \
int o, t, r, g, b; \
\
o = x * 4; \
r = dst[o + co[0]]; \
g = dst[o + co[1]]; \
b = dst[o + co[2]]; \
\
t = do_colorkey_pixel(colorkey_rgba, r, g, b, \
similarity, blend, max, scale); \
\
if (t > 0) { \
htype a = (r + g + b) / 3; \
htype rt = max - t; \
\
dst[o + co[0]] = (a * t + r * rt + half) >> depth; \
dst[o + co[1]] = (a * t + g * rt + half) >> depth; \
dst[o + co[2]] = (a * t + b * rt + half) >> depth; \
} \
} \
} \
\
return 0; \
}
static int do_colorhold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
AVFrame *frame = arg;
const int slice_start = (frame->height * jobnr) / nb_jobs;
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
ColorkeyContext *ctx = avctx->priv;
int x, y;
for (y = slice_start; y < slice_end; ++y) {
for (x = 0; x < frame->width; ++x) {
int o, t, r, g, b;
o = frame->linesize[0] * y + x * 4;
r = frame->data[0][o + ctx->co[0]];
g = frame->data[0][o + ctx->co[1]];
b = frame->data[0][o + ctx->co[2]];
t = do_colorkey_pixel(ctx, r, g, b);
if (t > 0) {
int a = (r + g + b) / 3;
int rt = 255 - t;
frame->data[0][o + ctx->co[0]] = (a * t + r * rt + 127) >> 8;
frame->data[0][o + ctx->co[1]] = (a * t + g * rt + 127) >> 8;
frame->data[0][o + ctx->co[2]] = (a * t + b * rt + 127) >> 8;
}
}
}
return 0;
}
static av_cold int init_filter(AVFilterContext *avctx)
{
ColorkeyContext *ctx = avctx->priv;
if (!strcmp(avctx->filter->name, "colorkey")) {
ctx->do_slice = do_colorkey_slice;
} else {
ctx->do_slice = do_colorhold_slice;
}
return 0;
}
COLORHOLD_SLICE(8, uint8_t, int)
COLORHOLD_SLICE(16, uint16_t, int64_t)
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
@ -148,15 +164,21 @@ static av_cold int config_output(AVFilterLink *outlink)
{
AVFilterContext *avctx = outlink->src;
ColorkeyContext *ctx = avctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
int i;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->inputs[0]->format);
ctx->depth = desc->comp[0].depth;
ctx->max = (1 << ctx->depth) - 1;
ctx->scale = 255.0 / ctx->max;
outlink->w = avctx->inputs[0]->w;
outlink->h = avctx->inputs[0]->h;
outlink->time_base = avctx->inputs[0]->time_base;
ff_fill_rgba_map(ctx->co, outlink->format);
for (i = 0; i < 4; ++i)
ctx->co[i] = desc->comp[i].offset;
if (!strcmp(avctx->filter->name, "colorkey")) {
ctx->do_slice = ctx->max == 255 ? do_colorkey_slice8 : do_colorkey_slice16;
} else {
ctx->do_slice = ctx->max == 255 ? do_colorhold_slice8 : do_colorhold_slice16;
}
return 0;
}
@ -166,6 +188,8 @@ static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_RGBA,
AV_PIX_FMT_ABGR,
AV_PIX_FMT_BGRA,
AV_PIX_FMT_RGBA64,
AV_PIX_FMT_BGRA64,
AV_PIX_FMT_NONE
};
@ -205,7 +229,6 @@ const AVFilter ff_vf_colorkey = {
.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on RGB colors."),
.priv_size = sizeof(ColorkeyContext),
.priv_class = &colorkey_class,
.init = init_filter,
FILTER_INPUTS(colorkey_inputs),
FILTER_OUTPUTS(colorkey_outputs),
FILTER_PIXFMTS_ARRAY(pixel_fmts),
@ -230,7 +253,6 @@ const AVFilter ff_vf_colorhold = {
.description = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray. Operates on RGB colors."),
.priv_size = sizeof(ColorkeyContext),
.priv_class = &colorhold_class,
.init = init_filter,
FILTER_INPUTS(colorkey_inputs),
FILTER_OUTPUTS(colorkey_outputs),
FILTER_PIXFMTS_ARRAY(pixel_fmts),