[FFmpeg-devel] [PATCH] colorkeymask filter
Paul B Mahol
onemda at gmail.com
Wed May 8 16:21:54 CEST 2013
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_colorkeymask.c | 161 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 163 insertions(+)
create mode 100644 libavfilter/vf_colorkeymask.c
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index f0e703e..04f9646 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -110,6 +110,7 @@ OBJS-$(CONFIG_BLEND_FILTER) += vf_blend.o
OBJS-$(CONFIG_BOXBLUR_FILTER) += vf_boxblur.o
OBJS-$(CONFIG_COLORBALANCE_FILTER) += vf_colorbalance.o
OBJS-$(CONFIG_COLORCHANNELMIXER_FILTER) += vf_colorchannelmixer.o
+OBJS-$(CONFIG_COLORKEYMASK_FILTER) += vf_colorkeymask.o
OBJS-$(CONFIG_COLORMATRIX_FILTER) += vf_colormatrix.o
OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index b8f273d..8d6e2fa 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -108,6 +108,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(BOXBLUR, boxblur, vf);
REGISTER_FILTER(COLORBALANCE, colorbalance, vf);
REGISTER_FILTER(COLORCHANNELMIXER, colorchannelmixer, vf);
+ REGISTER_FILTER(COLORKEYMASK, colorkeymask, vf);
REGISTER_FILTER(COLORMATRIX, colormatrix, vf);
REGISTER_FILTER(COPY, copy, vf);
REGISTER_FILTER(CROP, crop, vf);
diff --git a/libavfilter/vf_colorkeymask.c b/libavfilter/vf_colorkeymask.c
new file mode 100644
index 0000000..7efec0f
--- /dev/null
+++ b/libavfilter/vf_colorkeymask.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2013 Paul B Mahol
+ *
+ * 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/parseutils.h"
+#include "avfilter.h"
+#include "drawutils.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define R 0
+#define G 1
+#define B 2
+#define A 3
+
+typedef struct {
+ const AVClass *class;
+ char *color_str;
+ int rt, gt, bt;
+ uint8_t lut[3][256];
+ uint8_t rgba_map[4];
+} ColorKeyMaskContext;
+
+#define OFFSET(x) offsetof(ColorKeyMaskContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption colorkeymask_options[] = {
+ { "color", "set color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str="black"}, 0, 0, FLAGS },
+ { "r", "set red tolerance", OFFSET(rt), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
+ { "g", "set green tolerance", OFFSET(gt), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
+ { "b", "set blue tolerance", OFFSET(bt), AV_OPT_TYPE_INT, {.i64=10}, 0, 255, FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(colorkeymask);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ ColorKeyMaskContext *s = ctx->priv;
+ uint8_t rmin, gmin, bmin;
+ uint8_t rmax, gmax, bmax;
+ uint8_t rgba[4];
+ int i, ret;
+
+ ret = av_parse_color(rgba, s->color_str, -1, ctx);
+ if (ret < 0)
+ return ret;
+
+ rmin = av_clip_uint8(rgba[R] - s->rt);
+ gmin = av_clip_uint8(rgba[G] - s->gt);
+ bmin = av_clip_uint8(rgba[B] - s->bt);
+ rmax = av_clip_uint8(rgba[R] + s->rt);
+ gmax = av_clip_uint8(rgba[G] + s->gt);
+ bmax = av_clip_uint8(rgba[B] + s->bt);
+
+ for (i = 0; i < 256; i++) {
+ if (i >= rmin && i <= rmax)
+ s->lut[R][i] = 1;
+ if (i >= gmin && i <= gmax)
+ s->lut[G][i] = 1;
+ if (i >= bmin && i <= bmax)
+ s->lut[B][i] = 1;
+ }
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
+ AV_PIX_FMT_ABGR, AV_PIX_FMT_ARGB,
+ AV_PIX_FMT_NONE
+ };
+
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ ColorKeyMaskContext *s = inlink->dst->priv;
+ ff_fill_rgba_map(s->rgba_map, inlink->format);
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ AVFilterContext *ctx = inlink->dst;
+ ColorKeyMaskContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ const uint8_t r = s->rgba_map[R];
+ const uint8_t g = s->rgba_map[G];
+ const uint8_t b = s->rgba_map[B];
+ const uint8_t a = s->rgba_map[A];
+ const int bytewidth = inlink->w * 4;
+ uint8_t *dst;
+ int y, x;
+
+ dst = frame->data[0];
+
+ for (y = 0; y < inlink->h; y++) {
+ for (x = 0; x < bytewidth; x += 4) {
+ if (s->lut[R][dst[x + r]] &&
+ s->lut[G][dst[x + g]] &&
+ s->lut[B][dst[x + b]])
+ dst[x + a] = 0;
+ }
+ dst += frame->linesize[0];
+ }
+
+ return ff_filter_frame(outlink, frame);
+}
+
+static const AVFilterPad colorkeymask_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ .needs_writable = 1,
+ },
+ { NULL }
+};
+
+static const AVFilterPad colorkeymask_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter avfilter_vf_colorkeymask = {
+ .name = "colorkeymask",
+ .description = NULL_IF_CONFIG_SMALL("Clear alpha channel by comparing non-alpha channels."),
+ .priv_size = sizeof(ColorKeyMaskContext),
+ .priv_class = &colorkeymask_class,
+ .init = init,
+ .query_formats = query_formats,
+ .inputs = colorkeymask_inputs,
+ .outputs = colorkeymask_outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE,
+};
--
1.7.11.2
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