summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--doc/filters.texi7
-rw-r--r--libavfilter/Makefile1
-rw-r--r--libavfilter/allfilters.c1
-rw-r--r--libavfilter/avfilter.h2
-rw-r--r--libavfilter/vf_lut.c23
5 files changed, 32 insertions, 2 deletions
diff --git a/doc/filters.texi b/doc/filters.texi
index f7aacf2e19..c71fd48b6e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -813,7 +813,12 @@ format=rgba,lutrgb=a="maxval-minval/2"
lutyuv=y=gammaval(0.5)
@end example
-@section noformat
+@section negate
+
+Negate input video.
+
+This filter accepts an integer in input, if non-zero it negates the
+alpha component (if available). The default value in input is 0.
Force libavfilter not to use any of the specified pixel formats for the
input to the next filter.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 9659fd692f..e2285e4d39 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -36,6 +36,7 @@ OBJS-$(CONFIG_HQDN3D_FILTER) += vf_hqdn3d.o
OBJS-$(CONFIG_LUT_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUTRGB_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUTYUV_FILTER) += vf_lut.o
+OBJS-$(CONFIG_NEGATE_FILTER) += vf_lut.o
OBJS-$(CONFIG_NOFORMAT_FILTER) += vf_format.o
OBJS-$(CONFIG_NULL_FILTER) += vf_null.o
OBJS-$(CONFIG_OCV_FILTER) += vf_libopencv.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 1357322302..ba853c7178 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -57,6 +57,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (LUT, lut, vf);
REGISTER_FILTER (LUTRGB, lutrgb, vf);
REGISTER_FILTER (LUTYUV, lutyuv, vf);
+ REGISTER_FILTER (NEGATE, negate, vf);
REGISTER_FILTER (NOFORMAT, noformat, vf);
REGISTER_FILTER (NULL, null, vf);
REGISTER_FILTER (OCV, ocv, vf);
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index d4c03792da..66237c56b4 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -29,7 +29,7 @@
#include "libavutil/rational.h"
#define LIBAVFILTER_VERSION_MAJOR 2
-#define LIBAVFILTER_VERSION_MINOR 8
+#define LIBAVFILTER_VERSION_MINOR 9
#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_lut.c b/libavfilter/vf_lut.c
index d7fab5e17d..7f3e913945 100644
--- a/libavfilter/vf_lut.c
+++ b/libavfilter/vf_lut.c
@@ -69,6 +69,7 @@ typedef struct {
int is_rgb, is_yuv;
int rgba_map[4];
int step;
+ int negate_alpha; /* only used by negate */
} LutContext;
#define Y 0
@@ -369,3 +370,25 @@ DEFINE_LUT_FILTER(lutyuv, "Compute and apply a lookup table to the YUV input vid
#if CONFIG_LUTRGB_FILTER
DEFINE_LUT_FILTER(lutrgb, "Compute and apply a lookup table to the RGB input video.", init);
#endif
+
+#if CONFIG_NEGATE_FILTER
+
+static int negate_init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ LutContext *lut = ctx->priv;
+ char lut_params[64];
+
+ if (args)
+ sscanf(args, "%d", &lut->negate_alpha);
+
+ av_log(ctx, AV_LOG_DEBUG, "negate_alpha:%d\n", lut->negate_alpha);
+
+ snprintf(lut_params, sizeof(lut_params), "c0=negval:c1=negval:c2=negval:a=%s",
+ lut->negate_alpha ? "negval" : "val");
+
+ return init(ctx, lut_params, opaque);
+}
+
+DEFINE_LUT_FILTER(negate, "Negate input video.", negate_init);
+
+#endif