avfilter: add setrange filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -24,6 +24,7 @@ version <next>:
 - VAAPI VP8 decoding
 - AMD AMF H.264 and HEVC encoders
 - video fillborders filter
+- video setrange filter
 
 
 version 3.4:

doc/filters.texi

@@ -18496,6 +18496,37 @@ asetpts=N/SR/TB
 
 @end itemize
 
+@section setrange
+
+Force color range for the output video frame.
+
+The @code{setrange} filter marks the color range property for the
+output frames. It does not change the input frame, but only sets the
+corresponding property, which affects how the frame is treated by
+following filters.
+
+The filter accepts the following options:
+
+@table @option
+
+@item range
+Available values are:
+
+@table @samp
+@item auto
+Keep the same color range property.
+
+@item unspecified, unknown
+Set the color range as unspecified.
+
+@item limited, tv, mpeg
+Set the color range as limited.
+
+@item full, pc, jpeg
+Set the color range as full.
+@end table
+@end table
+
 @section settb, asettb
 
 Set the timebase to use for the output frames timestamps.

libavfilter/Makefile

@@ -300,6 +300,7 @@ OBJS-$(CONFIG_SEPARATEFIELDS_FILTER)         += vf_separatefields.o
 OBJS-$(CONFIG_SETDAR_FILTER)                 += vf_aspect.o
 OBJS-$(CONFIG_SETFIELD_FILTER)               += vf_setfield.o
 OBJS-$(CONFIG_SETPTS_FILTER)                 += setpts.o
+OBJS-$(CONFIG_SETRANGE_FILTER)               += vf_setparams.o
 OBJS-$(CONFIG_SETSAR_FILTER)                 += vf_aspect.o
 OBJS-$(CONFIG_SETTB_FILTER)                  += settb.o
 OBJS-$(CONFIG_SHOWINFO_FILTER)               += vf_showinfo.o

libavfilter/allfilters.c

@@ -309,6 +309,7 @@ static void register_all(void)
     REGISTER_FILTER(SETDAR,         setdar,         vf);
     REGISTER_FILTER(SETFIELD,       setfield,       vf);
     REGISTER_FILTER(SETPTS,         setpts,         vf);
+    REGISTER_FILTER(SETRANGE,       setrange,       vf);
     REGISTER_FILTER(SETSAR,         setsar,         vf);
     REGISTER_FILTER(SETTB,          settb,          vf);
     REGISTER_FILTER(SHOWINFO,       showinfo,       vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR   6
+#define LIBAVFILTER_VERSION_MINOR   7
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_setparams.c

@@ -0,0 +1,83 @@
+/*
+ * 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/pixfmt.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct SetParamsContext {
+    const AVClass *class;
+    int color_range;
+} SetParamsContext;
+
+#define OFFSET(x) offsetof(SetParamsContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption setrange_options[] = {
+    {"range", "select color range", OFFSET(color_range), AV_OPT_TYPE_INT, {.i64=-1},-1, AVCOL_RANGE_NB-1, FLAGS, "range"},
+    {"auto",  "keep the same color range",   0, AV_OPT_TYPE_CONST, {.i64=-1},                       0, 0, FLAGS, "range"},
+    {"unspecified",                  NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED},  0, 0, FLAGS, "range"},
+    {"unknown",                      NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_UNSPECIFIED},  0, 0, FLAGS, "range"},
+    {"limited",                      NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG},         0, 0, FLAGS, "range"},
+    {"tv",                           NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG},         0, 0, FLAGS, "range"},
+    {"mpeg",                         NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_MPEG},         0, 0, FLAGS, "range"},
+    {"full",                         NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG},         0, 0, FLAGS, "range"},
+    {"pc",                           NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG},         0, 0, FLAGS, "range"},
+    {"jpeg",                         NULL,   0, AV_OPT_TYPE_CONST, {.i64=AVCOL_RANGE_JPEG},         0, 0, FLAGS, "range"},
+    {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(setrange);
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+    AVFilterContext *ctx = inlink->dst;
+    SetParamsContext *s = ctx->priv;
+
+    if (s->color_range >= 0)
+        frame->color_range = s->color_range;
+    return ff_filter_frame(ctx->outputs[0], frame);
+}
+
+static const AVFilterPad inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_setrange = {
+    .name        = "setrange",
+    .description = NULL_IF_CONFIG_SMALL("Force color range for the output video frame."),
+    .priv_size   = sizeof(SetParamsContext),
+    .priv_class  = &setrange_class,
+    .inputs      = inputs,
+    .outputs     = outputs,
+};