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ffmpeg.wasm-core
Commit e21d4a7c authored by Paul B Mahol's avatar Paul B Mahol
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avfilter/vf_chromakey: add >8 bit support

parent d73f0627
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Showing with 143 additions and 10 deletions
libavfilter/vf_chromakey.c
View file @ e21d4a7c
......@@ -20,6 +20,7 @@
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
......@@ -29,12 +30,15 @@ typedef struct ChromakeyContext {
const AVClass *class;
uint8_t chromakey_rgba[4];
uint8_t chromakey_uv[2];
uint16_t chromakey_uv[2];
float similarity;
float blend;
int is_yuv;
int depth;
int mid;
int max;
int hsub_log2;
int vsub_log2;
......@@ -64,6 +68,28 @@ static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v
}
}
static uint16_t do_chromakey_pixel16(ChromakeyContext *ctx, uint16_t u[9], uint16_t v[9])
{
double max = ctx->max;
double diff = 0.0;
int du, dv, i;
for (i = 0; i < 9; ++i) {
du = (int)u[i] - ctx->chromakey_uv[0];
dv = (int)v[i] - ctx->chromakey_uv[1];
diff += sqrt((du * du + dv * dv) / (max * max));
}
diff /= 9.0;
if (ctx->blend > 0.0001) {
return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * max;
} else {
return (diff > ctx->similarity) ? max : 0;
}
}
static av_always_inline void get_pixel_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint8_t *u, uint8_t *v)
{
if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
......@@ -76,6 +102,18 @@ static av_always_inline void get_pixel_uv(AVFrame *frame, int hsub_log2, int vsu
*v = frame->data[2][frame->linesize[2] * y + x];
}
static av_always_inline void get_pixel16_uv(AVFrame *frame, int hsub_log2, int vsub_log2, int x, int y, uint16_t *u, uint16_t *v)
{
if (x < 0 || x >= frame->width || y < 0 || y >= frame->height)
return;
x >>= hsub_log2;
y >>= vsub_log2;
*u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
*v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
}
static int do_chromakey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
AVFrame *frame = arg;
......@@ -106,6 +144,40 @@ static int do_chromakey_slice(AVFilterContext *avctx, void *arg, int jobnr, int
return 0;
}
static int do_chromakey16_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;
ChromakeyContext *ctx = avctx->priv;
int x, y, xo, yo;
uint16_t u[9], v[9];
for (int i = 0; i < 9; i++) {
u[i] = ctx->chromakey_uv[0];
v[i] = ctx->chromakey_uv[1];
}
for (y = slice_start; y < slice_end; ++y) {
for (x = 0; x < frame->width; ++x) {
uint16_t *dst = (uint16_t *)(frame->data[3] + frame->linesize[3] * y);
for (yo = 0; yo < 3; ++yo) {
for (xo = 0; xo < 3; ++xo) {
get_pixel16_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
}
}
dst[x] = do_chromakey_pixel16(ctx, u, v);
}
}
return 0;
}
static int do_chromahold_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
ChromakeyContext *ctx = avctx->priv;
......@@ -143,6 +215,45 @@ static int do_chromahold_slice(AVFilterContext *avctx, void *arg, int jobnr, int
return 0;
}
static int do_chromahold16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
{
ChromakeyContext *ctx = avctx->priv;
AVFrame *frame = arg;
const int slice_start = ((frame->height >> ctx->vsub_log2) * jobnr) / nb_jobs;
const int slice_end = ((frame->height >> ctx->vsub_log2) * (jobnr + 1)) / nb_jobs;
const int mid = ctx->mid;
double max = ctx->max;
int x, y, alpha;
for (y = slice_start; y < slice_end; ++y) {
for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
int u = AV_RN16(&frame->data[1][frame->linesize[1] * y + 2 * x]);
int v = AV_RN16(&frame->data[2][frame->linesize[2] * y + 2 * x]);
double diff;
int du, dv;
du = u - ctx->chromakey_uv[0];
dv = v - ctx->chromakey_uv[1];
diff = sqrt((du * du + dv * dv) / (max * max));
alpha = diff > ctx->similarity;
if (ctx->blend > 0.0001) {
double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid + (u - mid) * f);
AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid + (v - mid) * f);
} else if (alpha) {
AV_WN16(&frame->data[1][frame->linesize[1] * y + 2 * x], mid);
AV_WN16(&frame->data[2][frame->linesize[2] * y + 2 * x], mid);
}
}
}
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *avctx = link->dst;
......@@ -159,22 +270,31 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame)
#define RGB_TO_U(rgb) (((- FIXNUM(0.16874) * rgb[0] - FIXNUM(0.33126) * rgb[1] + FIXNUM(0.50000) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
#define RGB_TO_V(rgb) ((( FIXNUM(0.50000) * rgb[0] - FIXNUM(0.41869) * rgb[1] - FIXNUM(0.08131) * rgb[2] + (1 << 9) - 1) >> 10) + 128)
static av_cold int initialize_chromakey(AVFilterContext *avctx)
static av_cold int config_output(AVFilterLink *outlink)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
AVFilterContext *avctx = outlink->src;
ChromakeyContext *ctx = avctx->priv;
int factor;
ctx->depth = desc->comp[0].depth;
ctx->mid = 1 << (ctx->depth - 1);
ctx->max = (1 << ctx->depth) - 1;
factor = 1 << (ctx->depth - 8);
if (ctx->is_yuv) {
ctx->chromakey_uv[0] = ctx->chromakey_rgba[1];
ctx->chromakey_uv[1] = ctx->chromakey_rgba[2];
ctx->chromakey_uv[0] = ctx->chromakey_rgba[1] * factor;
ctx->chromakey_uv[1] = ctx->chromakey_rgba[2] * factor;
} else {
ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba);
ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba);
ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba) * factor;
ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba) * factor;
}
if (!strcmp(avctx->filter->name, "chromakey")) {
ctx->do_slice = do_chromakey_slice;
ctx->do_slice = ctx->depth <= 8 ? do_chromakey_slice : do_chromakey16_slice;
} else {
ctx->do_slice = do_chromahold_slice;
ctx->do_slice = ctx->depth <= 8 ? do_chromahold_slice: do_chromahold16_slice;
}
return 0;
......@@ -186,6 +306,10 @@ static av_cold int query_formats(AVFilterContext *avctx)
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVA422P,
AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
......@@ -196,6 +320,15 @@ static av_cold int query_formats(AVFilterContext *avctx)
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVA422P,
AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
......@@ -235,6 +368,7 @@ static const AVFilterPad chromakey_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
......@@ -257,7 +391,6 @@ AVFilter ff_vf_chromakey = {
.description = NULL_IF_CONFIG_SMALL("Turns a certain color into transparency. Operates on YUV colors."),
.priv_size = sizeof(ChromakeyContext),
.priv_class = &chromakey_class,
.init = initialize_chromakey,
.query_formats = query_formats,
.inputs = chromakey_inputs,
.outputs = chromakey_outputs,
......@@ -287,6 +420,7 @@ static const AVFilterPad chromahold_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
......@@ -298,7 +432,6 @@ AVFilter ff_vf_chromahold = {
.description = NULL_IF_CONFIG_SMALL("Turns a certain color range into gray."),
.priv_size = sizeof(ChromakeyContext),
.priv_class = &chromahold_class,
.init = initialize_chromakey,
.query_formats = query_formats,
.inputs = chromahold_inputs,
.outputs = chromahold_outputs,
......
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