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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 "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;
int32_t hue_sin;
int32_t hue_cos;
} HueContext;
static av_cold int init(AVFilterContext *ctx, const char *args)
{
HueContext *hue = ctx->priv;
float h = 0, s = 1;
int n;
char c1 = 0, c2 = 0;
if (args) {
n = sscanf(args, "%f%c%f%c", &h, &c1, &s, &c2);
if (n != 0 && 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 (s < -10 || s > 10) {
av_log(ctx, AV_LOG_ERROR,
"Invalid value for saturation %0.1f: "
"must be included between range -10 and +10\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)
{
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,
.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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