[FFmpeg-cvslog] avfilter: add chromahold filter
Paul B Mahol
git at videolan.org
Sun Oct 21 13:59:46 EEST 2018
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Thu Oct 18 12:08:47 2018 +0200| [18d391cffee3ee333735357e262605d58a1be34f] | committer: Paul B Mahol
avfilter: add chromahold filter
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=18d391cffee3ee333735357e262605d58a1be34f
---
Changelog | 1 +
doc/filters.texi | 20 ++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 2 +-
libavfilter/vf_chromakey.c | 96 +++++++++++++++++++++++++++++++++++++++++++++-
6 files changed, 118 insertions(+), 3 deletions(-)
diff --git a/Changelog b/Changelog
index 1b0bc95b7a..3b5131190c 100644
--- a/Changelog
+++ b/Changelog
@@ -35,6 +35,7 @@ version <next>:
- AV1 parser
- SER demuxer
- sinc audio filter source
+- chromahold filter
version 4.0:
diff --git a/doc/filters.texi b/doc/filters.texi
index a2dee4a39b..ad3e666253 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6163,6 +6163,26 @@ Only deinterlace frames marked as interlaced.
The default value is @code{all}.
@end table
+ at section chromahold
+Remove all color information for all colors except for certain one.
+
+The filter accepts the following options:
+
+ at table @option
+ at item color
+The color which will not be replaced with neutral chroma.
+
+ at item similarity
+Similarity percentage with the above color.
+0.01 matches only the exact key color, while 1.0 matches everything.
+
+ at item yuv
+Signals that the color passed is already in YUV instead of RGB.
+
+Literal colors like "green" or "red" don't make sense with this enabled anymore.
+This can be used to pass exact YUV values as hexadecimal numbers.
+ at end table
+
@section chromakey
YUV colorspace color/chroma keying.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index b03b2457eb..46c6023bcc 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -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
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 725bac94a0..536765581b 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -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;
diff --git a/libavfilter/version.h b/libavfilter/version.h
index bb57c5fbed..17a1a36142 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -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, \
diff --git a/libavfilter/vf_chromakey.c b/libavfilter/vf_chromakey.c
index 88414783bc..42b7d71d49 100644
--- a/libavfilter/vf_chromakey.c
+++ b/libavfilter/vf_chromakey.c
@@ -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,
+};
More information about the ffmpeg-cvslog
mailing list