[FFmpeg-devel] [PATCH 1/2] libavfilter: add vf_hue.c
Jérémy Tran
tran.jeremy.av at gmail.com
Sun Aug 12 13:26:17 CEST 2012
This is a port of the MPlayer hue filter (libmpcodecs/vf_hue.c)
Signed-off-by: Jérémy Tran <tran.jeremy.av at gmail.com>
---
doc/filters.texi | 20 +++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_hue.c | 194 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 216 insertions(+)
create mode 100644 libavfilter/vf_hue.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 18be723..71f6670 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -2187,6 +2187,26 @@ a float number which specifies chroma temporal strength, defaults to
@var{luma_tmp}*@var{chroma_spatial}/@var{luma_spatial}
@end table
+ at section hue
+
+Modify the hue and/or the saturation of the input.
+
+The filter supports the following syntaxes:
+ at example
+# hue = 100 ; saturation = 1
+ffmpeg -i in.avi -vf hue=100:1
+
+# same command but using named options
+ffmpeg -i in.avi -vf hue=h=100:s=1
+ at end example
+
+ at table @option
+ at item hue
+A float number that specifies the hue in the [-360;360] range, defaults to 0.0.
+ at item saturation
+A float number that specifies the saturation in the [0;2] range, defaults to 1.0.
+ at end table
+
@section idet
Interlaceing detect filter. This filter tries to detect if the input is
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 727ab4e..66b5d52 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -98,6 +98,7 @@ OBJS-$(CONFIG_FREI0R_FILTER) += vf_frei0r.o
OBJS-$(CONFIG_GRADFUN_FILTER) += vf_gradfun.o
OBJS-$(CONFIG_HFLIP_FILTER) += vf_hflip.o
OBJS-$(CONFIG_HQDN3D_FILTER) += vf_hqdn3d.o
+OBJS-$(CONFIG_HUE_FILTER) += vf_hue.o
OBJS-$(CONFIG_IDET_FILTER) += vf_idet.o
OBJS-$(CONFIG_LUT_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUTRGB_FILTER) += vf_lut.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 403383d..f097bcf 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -88,6 +88,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (GRADFUN, gradfun, vf);
REGISTER_FILTER (HFLIP, hflip, vf);
REGISTER_FILTER (HQDN3D, hqdn3d, vf);
+ REGISTER_FILTER (HUE, hue, vf);
REGISTER_FILTER (IDET, idet, vf);
REGISTER_FILTER (LUT, lut, vf);
REGISTER_FILTER (LUTRGB, lutrgb, vf);
diff --git a/libavfilter/vf_hue.c b/libavfilter/vf_hue.c
new file mode 100644
index 0000000..8523e66
--- /dev/null
+++ b/libavfilter/vf_hue.c
@@ -0,0 +1,194 @@
+/*
+ * Copyright (c) 2003 Michael Niedermayer
+ * Copyright (c) 2012 Jeremy Tran
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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.
+ */
+
+/**
+ * @file
+ * Apply a hue/saturation filter to the input video
+ * Ported from MPlayer libmpcodecs/vf_hue.c
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/pixdesc.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct {
+ float hue;
+ float saturation;
+ int hsub;
+ int vsub;
+ uint32_t hue_sin;
+ uint32_t hue_cos;
+} HueContext;
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+ HueContext *hue = ctx->priv;
+ float h = 0, s = 1;
+ int32_t ret;
+ char c1 = 0, c2 = 0;
+
+ if (args) {
+ ret = sscanf(args, "%f%c%f%c", &h, &c1, &s, &c2);
+ if (!ret || c1 != ':' || c2) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Error parsing the options string: %s\n", args);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ if (s < 0 || s > 2) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Invalid value for s:%0.1f : must be included in the range 0-2\n",
+ s);
+ return AVERROR(EINVAL);
+ }
+
+ /* Convert angle from degree to radian */
+ hue->hue = h * M_PI / 180;
+ hue->saturation = s;
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum PixelFormat pix_fmts[] = {
+ PIX_FMT_YUV444P, PIX_FMT_YUV422P,
+ PIX_FMT_YUV420P, PIX_FMT_YUV411P,
+ PIX_FMT_YUV410P, PIX_FMT_YUV440P,
+ PIX_FMT_YUVA420P,
+ PIX_FMT_NONE
+ };
+
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+
+ return 0;
+}
+
+static int config_props(AVFilterLink *inlink)
+{
+ HueContext *hue = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];
+
+ hue->hsub = desc->log2_chroma_w;
+ hue->vsub = desc->log2_chroma_h;
+ /*
+ * Scale the value to the norm of the resulting (U,V) vector, that is
+ * the saturation.
+ * This will be useful in the process_chrominance function.
+ */
+ hue->hue_sin = rint(sin(hue->hue) * (1 << 16) * hue->saturation);
+ hue->hue_cos = rint(cos(hue->hue) * (1 << 16) * hue->saturation);
+
+ return 0;
+}
+
+static void process_chrominance(uint8_t *udst, uint8_t *vdst, const int dst_linesize,
+ uint8_t *usrc, uint8_t *vsrc, const int src_linesize,
+ int w, int h,
+ const int32_t c, const int32_t s)
+{
+ uint32_t i;
+ uint32_t u, v;
+ uint32_t new_u, new_v;
+
+ /*
+ * If we consider U and V as the components of a 2D vector then its angle
+ * is the hue and the norm is the saturation
+ */
+ while (h--) {
+ for (i = 0; i < w; i++) {
+ /* Normalize the components from range [16;140] to [-112;112] */
+ u = usrc[i] - 128;
+ v = vsrc[i] - 128;
+ /*
+ * Apply the rotation of the vector : (c * u) - (s * v)
+ * (s * u) + (c * v)
+ * De-normalize the components (without forgetting to scale 128
+ * by << 16)
+ * Finally scale back the result by >> 16
+ */
+ new_u = ((c * u) - (s * v) + (1 << 15) + (128 << 16)) >> 16;
+ new_v = ((s * u) + (c * v) + (1 << 15) + (128 << 16)) >> 16;
+
+ /* Prevent a potential overflow */
+ udst[i] = av_clip_uint8_c(new_u);
+ vdst[i] = av_clip_uint8_c(new_v);
+ }
+
+ usrc += src_linesize;
+ vsrc += src_linesize;
+ udst += dst_linesize;
+ vdst += dst_linesize;
+ }
+}
+
+static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+{
+ HueContext *hue = inlink->dst->priv;
+ AVFilterBufferRef *inpic = inlink->cur_buf;
+ AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
+ uint8_t *inrow[3], *outrow[3]; // 0 : Y, 1 : U, 2 : V
+ int plane;
+
+ inrow[0] = inpic->data[0] + y * inpic->linesize[0];
+ outrow[0] = outpic->data[0] + y * outpic->linesize[0];
+
+ for (plane = 1; plane < 3; plane++) {
+ inrow[plane] = inpic->data[plane] + (y >> hue->vsub) * inpic->linesize[plane];
+ outrow[plane] = outpic->data[plane] + (y >> hue->vsub) * outpic->linesize[plane];
+ }
+
+ av_image_copy_plane(outrow[0], outpic->linesize[0],
+ inrow[0], inpic->linesize[0],
+ inlink->w, inlink->h);
+
+ process_chrominance(outrow[1], outrow[2], outpic->linesize[1],
+ inrow[1], inrow[2], inpic->linesize[1],
+ inlink->w >> hue->hsub, inlink->h >> hue->vsub,
+ hue->hue_cos, hue->hue_sin);
+
+ return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
+}
+
+AVFilter avfilter_vf_hue = {
+ .name = "hue",
+ .description = NULL_IF_CONFIG_SMALL("Adjust the hue and saturation of the input video"),
+
+ .priv_size = sizeof(HueContext),
+
+ .init = init,
+ .query_formats = query_formats,
+
+ .inputs = (const AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .draw_slice = draw_slice,
+ .config_props = config_props,
+ .min_perms = AV_PERM_READ },
+ { .name = NULL}},
+ .outputs = (const AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO },
+ { .name = NULL}}
+};
--
1.7.11.3
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