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-rw-r--r--libavfilter/vf_hue.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/libavfilter/vf_hue.c b/libavfilter/vf_hue.c
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+++ b/libavfilter/vf_hue.c
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+/*
+ * 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 <float.h>
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define HUE_DEFAULT_VAL 0
+#define SAT_DEFAULT_VAL 1
+
+typedef struct {
+ const AVClass *class;
+ float hue_deg; /* hue expressed in degrees */
+ float hue; /* hue expressed in radians */
+ float saturation;
+ int hsub;
+ int vsub;
+ int32_t hue_sin;
+ int32_t hue_cos;
+} HueContext;
+
+#define OFFSET(x) offsetof(HueContext, x)
+static const AVOption hue_options[] = {
+ { "h", "set the hue angle degrees", OFFSET(hue_deg), AV_OPT_TYPE_FLOAT,
+ { -FLT_MAX }, -FLT_MAX, FLT_MAX, AV_OPT_FLAG_VIDEO_PARAM },
+ { "H", "set the hue angle radians", OFFSET(hue), AV_OPT_TYPE_FLOAT,
+ { -FLT_MAX }, -FLT_MAX, FLT_MAX, AV_OPT_FLAG_VIDEO_PARAM },
+ { "s", "set the saturation value", OFFSET(saturation), AV_OPT_TYPE_FLOAT,
+ { SAT_DEFAULT_VAL }, -10, 10, AV_OPT_FLAG_VIDEO_PARAM },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(hue);
+
+static av_cold int init(AVFilterContext *ctx, const char *args)
+{
+ HueContext *hue = ctx->priv;
+ int n, ret;
+ char c1 = 0, c2 = 0;
+ char *equal;
+
+ hue->class = &hue_class;
+ av_opt_set_defaults(hue);
+
+ if (args) {
+ /* named options syntax */
+ if (equal = strchr(args, '=')) {
+ if ((ret = av_set_options_string(hue, args, "=", ":")) < 0)
+ return ret;
+ if (hue->hue != -FLT_MAX && hue->hue_deg != -FLT_MAX) {
+ av_log(ctx, AV_LOG_ERROR,
+ "H and h options are incompatible and cannot be specified "
+ "at the same time\n");
+ return AVERROR(EINVAL);
+ }
+ /* compatibility h:s syntax */
+ } else {
+ n = sscanf(args, "%f%c%f%c", &hue->hue_deg, &c1, &hue->saturation, &c2);
+ if (n != 1 && (n != 3 || c1 != ':')) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Invalid syntax for argument '%s': "
+ "must be in the form 'hue[:saturation]'\n", args);
+ return AVERROR(EINVAL);
+ }
+
+ if (hue->saturation < -10 || hue->saturation > 10) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Invalid value for saturation %0.1f: "
+ "must be included between range -10 and +10\n", hue->saturation);
+ return AVERROR(EINVAL);
+ }
+ }
+ }
+
+ if (hue->saturation == -FLT_MAX)
+ hue->hue = SAT_DEFAULT_VAL;
+ if (hue->hue == -FLT_MAX)
+ hue->hue = HUE_DEFAULT_VAL;
+ if (hue->hue_deg != -FLT_MAX)
+ /* Convert angle from degrees to radians */
+ hue->hue = hue->hue_deg * M_PI / 180;
+
+ av_log(ctx, AV_LOG_VERBOSE, "hue:%f*PI hue_deg:%f saturation:%f\n",
+ hue->hue/M_PI, hue->hue*180/M_PI, hue->saturation);
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ HueContext *hue = ctx->priv;
+
+ av_opt_free(hue);
+}
+
+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)
+{
+ int32_t u, v, new_u, new_v;
+ int i;
+
+ /*
+ * 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,
+ .uninit = uninit,
+ .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 }
+ }
+};
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