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avfilter: add chromahold filter

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This commit is contained in:
Paul B Mahol
2018-10-18 12:08:47 +02:00
parent e715b8e10d
commit 18d391cffe
6 changed files with 118 additions and 3 deletions
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1
libavfilter/Makefile
View File

@@ -166,6 +166,7 @@ OBJS-$(CONFIG_BOXBLUR_FILTER) += vf_boxblur.o boxblur.o
OBJS-$(CONFIG_BOXBLUR_OPENCL_FILTER) += vf_avgblur_opencl.o opencl.o \
opencl/avgblur.o boxblur.o
OBJS-$(CONFIG_BWDIF_FILTER) += vf_bwdif.o
OBJS-$(CONFIG_CHROMAHOLD_FILTER) += vf_chromakey.o
OBJS-$(CONFIG_CHROMAKEY_FILTER) += vf_chromakey.o
OBJS-$(CONFIG_CIESCOPE_FILTER) += vf_ciescope.o
OBJS-$(CONFIG_CODECVIEW_FILTER) += vf_codecview.o

1
libavfilter/allfilters.c
View File

@@ -156,6 +156,7 @@ extern AVFilter ff_vf_bm3d;
extern AVFilter ff_vf_boxblur;
extern AVFilter ff_vf_boxblur_opencl;
extern AVFilter ff_vf_bwdif;
extern AVFilter ff_vf_chromahold;
extern AVFilter ff_vf_chromakey;
extern AVFilter ff_vf_ciescope;
extern AVFilter ff_vf_codecview;

2
libavfilter/version.h
View File

@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
#define LIBAVFILTER_VERSION_MINOR 34
#define LIBAVFILTER_VERSION_MINOR 35
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

96
libavfilter/vf_chromakey.c
View File

@@ -38,6 +38,9 @@ typedef struct ChromakeyContext {
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])
@@ -103,12 +106,45 @@ static int do_chromakey_slice(AVFilterContext *avctx, void *arg, int jobnr, int
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 (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, do_chromakey_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(avctx))))
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);
@@ -130,6 +166,12 @@ static av_cold int initialize_chromakey(AVFilterContext *avctx)
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;
}
@@ -142,9 +184,19 @@ static av_cold int query_formats(AVFilterContext *avctx)
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(pixel_fmts);
formats = ff_make_format_list(!strcmp(avctx->filter->name, "chromahold") ? hold_pixel_fmts : pixel_fmts);
if (!formats)
return AVERROR(ENOMEM);
@@ -206,3 +258,43 @@ AVFilter ff_vf_chromakey = {
.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 },
{ "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,
};