mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
307 lines
9.7 KiB
C
307 lines
9.7 KiB
C
/*
|
|
* Copyright (c) 2015 Timo Rothenpieler <timo@rothenpieler.org>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/opt.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "avfilter.h"
|
|
#include "formats.h"
|
|
#include "internal.h"
|
|
#include "video.h"
|
|
|
|
typedef struct ChromakeyContext {
|
|
const AVClass *class;
|
|
|
|
uint8_t chromakey_rgba[4];
|
|
uint8_t chromakey_uv[2];
|
|
|
|
float similarity;
|
|
float blend;
|
|
|
|
int is_yuv;
|
|
|
|
int hsub_log2;
|
|
int vsub_log2;
|
|
|
|
int (*do_slice)(AVFilterContext *ctx, void *arg,
|
|
int jobnr, int nb_jobs);
|
|
} ChromakeyContext;
|
|
|
|
static uint8_t do_chromakey_pixel(ChromakeyContext *ctx, uint8_t u[9], uint8_t v[9])
|
|
{
|
|
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) / (255.0 * 255.0));
|
|
}
|
|
|
|
diff /= 9.0;
|
|
|
|
if (ctx->blend > 0.0001) {
|
|
return av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0) * 255.0;
|
|
} else {
|
|
return (diff > ctx->similarity) ? 255 : 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)
|
|
return;
|
|
|
|
x >>= hsub_log2;
|
|
y >>= vsub_log2;
|
|
|
|
*u = frame->data[1][frame->linesize[1] * y + x];
|
|
*v = frame->data[2][frame->linesize[2] * y + x];
|
|
}
|
|
|
|
static int do_chromakey_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;
|
|
uint8_t u[9], v[9];
|
|
|
|
memset(u, ctx->chromakey_uv[0], sizeof(u));
|
|
memset(v, ctx->chromakey_uv[1], sizeof(v));
|
|
|
|
for (y = slice_start; y < slice_end; ++y) {
|
|
for (x = 0; x < frame->width; ++x) {
|
|
for (yo = 0; yo < 3; ++yo) {
|
|
for (xo = 0; xo < 3; ++xo) {
|
|
get_pixel_uv(frame, ctx->hsub_log2, ctx->vsub_log2, x + xo - 1, y + yo - 1, &u[yo * 3 + xo], &v[yo * 3 + xo]);
|
|
}
|
|
}
|
|
|
|
frame->data[3][frame->linesize[3] * y + x] = do_chromakey_pixel(ctx, u, v);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int do_chromahold_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;
|
|
|
|
int x, y, alpha;
|
|
|
|
for (y = slice_start; y < slice_end; ++y) {
|
|
for (x = 0; x < frame->width >> ctx->hsub_log2; ++x) {
|
|
int u = frame->data[1][frame->linesize[1] * y + x];
|
|
int v = frame->data[2][frame->linesize[2] * y + x];
|
|
double diff;
|
|
int du, dv;
|
|
|
|
du = u - ctx->chromakey_uv[0];
|
|
dv = v - ctx->chromakey_uv[1];
|
|
|
|
diff = sqrt((du * du + dv * dv) / (255.0 * 255.0));
|
|
|
|
alpha = diff > ctx->similarity;
|
|
if (ctx->blend > 0.0001) {
|
|
double f = 1. - av_clipd((diff - ctx->similarity) / ctx->blend, 0.0, 1.0);
|
|
|
|
frame->data[1][frame->linesize[1] * y + x] = 128 + (u - 128) * f;
|
|
frame->data[2][frame->linesize[2] * y + x] = 128 + (v - 128) * f;
|
|
} else if (alpha) {
|
|
frame->data[1][frame->linesize[1] * y + x] = 128;
|
|
frame->data[2][frame->linesize[2] * y + x] = 128;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *link, AVFrame *frame)
|
|
{
|
|
AVFilterContext *avctx = link->dst;
|
|
ChromakeyContext *ctx = avctx->priv;
|
|
int res;
|
|
|
|
if (res = avctx->internal->execute(avctx, ctx->do_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
|
|
return res;
|
|
|
|
return ff_filter_frame(avctx->outputs[0], frame);
|
|
}
|
|
|
|
#define FIXNUM(x) lrint((x) * (1 << 10))
|
|
#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)
|
|
{
|
|
ChromakeyContext *ctx = avctx->priv;
|
|
|
|
if (ctx->is_yuv) {
|
|
ctx->chromakey_uv[0] = ctx->chromakey_rgba[1];
|
|
ctx->chromakey_uv[1] = ctx->chromakey_rgba[2];
|
|
} else {
|
|
ctx->chromakey_uv[0] = RGB_TO_U(ctx->chromakey_rgba);
|
|
ctx->chromakey_uv[1] = RGB_TO_V(ctx->chromakey_rgba);
|
|
}
|
|
|
|
if (!strcmp(avctx->filter->name, "chromakey")) {
|
|
ctx->do_slice = do_chromakey_slice;
|
|
} else {
|
|
ctx->do_slice = do_chromahold_slice;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int query_formats(AVFilterContext *avctx)
|
|
{
|
|
static const enum AVPixelFormat pixel_fmts[] = {
|
|
AV_PIX_FMT_YUVA420P,
|
|
AV_PIX_FMT_YUVA422P,
|
|
AV_PIX_FMT_YUVA444P,
|
|
AV_PIX_FMT_NONE
|
|
};
|
|
|
|
static const enum AVPixelFormat hold_pixel_fmts[] = {
|
|
AV_PIX_FMT_YUV420P,
|
|
AV_PIX_FMT_YUV422P,
|
|
AV_PIX_FMT_YUV444P,
|
|
AV_PIX_FMT_YUVA420P,
|
|
AV_PIX_FMT_YUVA422P,
|
|
AV_PIX_FMT_YUVA444P,
|
|
AV_PIX_FMT_NONE
|
|
};
|
|
|
|
AVFilterFormats *formats = NULL;
|
|
|
|
formats = ff_make_format_list(!strcmp(avctx->filter->name, "chromahold") ? hold_pixel_fmts : pixel_fmts);
|
|
if (!formats)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return ff_set_common_formats(avctx, formats);
|
|
}
|
|
|
|
static av_cold int config_input(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *avctx = inlink->dst;
|
|
ChromakeyContext *ctx = avctx->priv;
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
|
|
|
|
ctx->hsub_log2 = desc->log2_chroma_w;
|
|
ctx->vsub_log2 = desc->log2_chroma_h;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const AVFilterPad chromakey_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.needs_writable = 1,
|
|
.filter_frame = filter_frame,
|
|
.config_props = config_input,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad chromakey_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
#define OFFSET(x) offsetof(ChromakeyContext, x)
|
|
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
|
|
|
|
static const AVOption chromakey_options[] = {
|
|
{ "color", "set the chromakey key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
|
|
{ "similarity", "set the chromakey similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
|
|
{ "blend", "set the chromakey key blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
|
|
{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(chromakey);
|
|
|
|
AVFilter ff_vf_chromakey = {
|
|
.name = "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,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
|
|
};
|
|
|
|
static const AVOption chromahold_options[] = {
|
|
{ "color", "set the chromahold key color", OFFSET(chromakey_rgba), AV_OPT_TYPE_COLOR, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
|
|
{ "similarity", "set the chromahold similarity value", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.01 }, 0.01, 1.0, FLAGS },
|
|
{ "blend", "set the chromahold blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
|
|
{ "yuv", "color parameter is in yuv instead of rgb", OFFSET(is_yuv), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad chromahold_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.needs_writable = 1,
|
|
.filter_frame = filter_frame,
|
|
.config_props = config_input,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad chromahold_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(chromahold);
|
|
|
|
AVFilter ff_vf_chromahold = {
|
|
.name = "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,
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
|
|
};
|