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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/eval.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
#define HUE_DEFAULT_VAL_STRING AV_STRINGIFY(HUE_DEFAULT_VAL)
#define SAT_DEFAULT_VAL_STRING AV_STRINGIFY(SAT_DEFAULT_VAL)
#define SAT_MIN_VAL -10
#define SAT_MAX_VAL 10
static const char *const var_names[] = {
"n", // frame count
"pts", // presentation timestamp expressed in AV_TIME_BASE units
"r", // frame rate
"t", // timestamp expressed in seconds
"tb", // timebase
NULL
};
enum var_name {
VAR_N,
VAR_PTS,
VAR_R,
VAR_T,
VAR_TB,
VAR_NB
};
typedef struct {
const AVClass *class;
float hue_deg; /* hue expressed in degrees */
float hue; /* hue expressed in radians */
char *hue_deg_expr;
char *hue_expr;
AVExpr *hue_deg_pexpr;
AVExpr *hue_pexpr;
float saturation;
char *saturation_expr;
AVExpr *saturation_pexpr;
int hsub;
int vsub;
int32_t hue_sin;
int32_t hue_cos;
int flat_syntax;
double var_values[VAR_NB];
} HueContext;
#define OFFSET(x) offsetof(HueContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption hue_options[] = {
{ "h", "set the hue angle degrees expression", OFFSET(hue_deg_expr), AV_OPT_TYPE_STRING,
{ .str = NULL }, .flags = FLAGS },
{ "H", "set the hue angle radians expression", OFFSET(hue_expr), AV_OPT_TYPE_STRING,
{ .str = NULL }, .flags = FLAGS },
{ "s", "set the saturation expression", OFFSET(saturation_expr), AV_OPT_TYPE_STRING,
{ .str = NULL }, .flags = FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(hue);
static inline void compute_sin_and_cos(HueContext *hue)
{
/*
* 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);
}
#define PARSE_EXPRESSION(attr, name) \
do { \
if ((ret = av_expr_parse(&hue->attr##_pexpr, hue->attr##_expr, var_names, \
NULL, NULL, NULL, NULL, 0, ctx)) < 0) { \
av_log(ctx, AV_LOG_ERROR, \
"Parsing failed for expression " #name "='%s'", \
hue->attr##_expr); \
hue->attr##_expr = old_##attr##_expr; \
hue->attr##_pexpr = old_##attr##_pexpr; \
return AVERROR(EINVAL); \
} else if (old_##attr##_pexpr) { \
av_free(old_##attr##_expr); \
av_expr_free(old_##attr##_pexpr); \
} \
} while (0)
static inline int set_options(AVFilterContext *ctx, const char *args)
{
HueContext *hue = ctx->priv;
int n, ret;
char c1 = 0, c2 = 0;
char *old_hue_expr, *old_hue_deg_expr, *old_saturation_expr;
AVExpr *old_hue_pexpr, *old_hue_deg_pexpr, *old_saturation_pexpr;
if (args) {
/* named options syntax */
if (strchr(args, '=')) {
old_hue_expr = hue->hue_expr;
old_hue_deg_expr = hue->hue_deg_expr;
old_saturation_expr = hue->saturation_expr;
old_hue_pexpr = hue->hue_pexpr;
old_hue_deg_pexpr = hue->hue_deg_pexpr;
old_saturation_pexpr = hue->saturation_pexpr;
hue->hue_expr = NULL;
hue->hue_deg_expr = NULL;
if ((ret = av_set_options_string(hue, args, "=", ":")) < 0)
return ret;
if (hue->hue_expr && hue->hue_deg_expr) {
av_log(ctx, AV_LOG_ERROR,
"H and h options are incompatible and cannot be specified "
"at the same time\n");
hue->hue_expr = old_hue_expr;
hue->hue_deg_expr = old_hue_deg_expr;
return AVERROR(EINVAL);
}
/*
* if both 'H' and 'h' options have not been specified, restore the
* old values
*/
if (!hue->hue_expr && !hue->hue_deg_expr) {
hue->hue_expr = old_hue_expr;
hue->hue_deg_expr = old_hue_deg_expr;
}
if (hue->hue_deg_expr)
PARSE_EXPRESSION(hue_deg, h);
if (hue->hue_expr)
PARSE_EXPRESSION(hue, H);
if (hue->saturation_expr)
PARSE_EXPRESSION(saturation, s);
hue->flat_syntax = 0;
av_log(ctx, AV_LOG_VERBOSE,
"H_expr:%s h_deg_expr:%s s_expr:%s\n",
hue->hue_expr, hue->hue_deg_expr, hue->saturation_expr);
/* 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 < SAT_MIN_VAL || hue->saturation > SAT_MAX_VAL) {
av_log(ctx, AV_LOG_ERROR,
"Invalid value for saturation %0.1f: "
"must be included between range %d and +%d\n",
hue->saturation, SAT_MIN_VAL, SAT_MAX_VAL);
return AVERROR(EINVAL);
}
hue->hue = hue->hue_deg * M_PI / 180;
hue->flat_syntax = 1;
av_log(ctx, AV_LOG_VERBOSE,
"H:%0.1f h:%0.1f s:%0.1f\n",
hue->hue, hue->hue_deg, hue->saturation);
}
}
compute_sin_and_cos(hue);
return 0;
}
static av_cold int init(AVFilterContext *ctx, const char *args)
{
HueContext *hue = ctx->priv;
hue->class = &hue_class;
av_opt_set_defaults(hue);
hue->saturation = SAT_DEFAULT_VAL;
hue->hue = HUE_DEFAULT_VAL;
hue->hue_deg_pexpr = NULL;
hue->hue_pexpr = NULL;
hue->flat_syntax = 1;
return set_options(ctx, args);
}
static av_cold void uninit(AVFilterContext *ctx)
{
HueContext *hue = ctx->priv;
av_opt_free(hue);
av_free(hue->hue_deg_expr);
av_expr_free(hue->hue_deg_pexpr);
av_free(hue->hue_expr);
av_expr_free(hue->hue_pexpr);
av_free(hue->saturation_expr);
av_expr_free(hue->saturation_pexpr);
}
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;
hue->var_values[VAR_N] = 0;
hue->var_values[VAR_TB] = av_q2d(inlink->time_base);
hue->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
NAN : av_q2d(inlink->frame_rate);
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;
}
}
#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb))
static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpic)
{
HueContext *hue = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFilterBufferRef *buf_out;
outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
if (!outlink->out_buf)
return AVERROR(ENOMEM);
avfilter_copy_buffer_ref_props(outlink->out_buf, inpic);
outlink->out_buf->video->w = outlink->w;
outlink->out_buf->video->h = outlink->h;
buf_out = avfilter_ref_buffer(outlink->out_buf, ~0);
if (!buf_out)
return AVERROR(ENOMEM);
if (!hue->flat_syntax) {
hue->var_values[VAR_T] = TS2T(inpic->pts, inlink->time_base);
hue->var_values[VAR_PTS] = TS2D(inpic->pts);
if (hue->saturation_expr) {
hue->saturation = av_expr_eval(hue->saturation_pexpr, hue->var_values, NULL);
if (hue->saturation < SAT_MIN_VAL || hue->saturation > SAT_MAX_VAL) {
hue->saturation = av_clip(hue->saturation, SAT_MIN_VAL, SAT_MAX_VAL);
av_log(inlink->dst, AV_LOG_WARNING,
"Saturation value not in range [%d,%d]: clipping value to %0.1f\n",
SAT_MIN_VAL, SAT_MAX_VAL, hue->saturation);
}
}
if (hue->hue_deg_expr) {
hue->hue_deg = av_expr_eval(hue->hue_deg_pexpr, hue->var_values, NULL);
hue->hue = hue->hue_deg * M_PI / 180;
} else if (hue->hue_expr) {
hue->hue = av_expr_eval(hue->hue_pexpr, hue->var_values, NULL);
}
av_log(inlink->dst, AV_LOG_DEBUG,
"H:%0.1f s:%0.f t:%0.1f n:%d\n",
hue->hue, hue->saturation,
hue->var_values[VAR_T], (int)hue->var_values[VAR_N]);
compute_sin_and_cos(hue);
}
hue->var_values[VAR_N] += 1;
return ff_start_frame(outlink, buf_out);
}
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);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
if (!strcmp(cmd, "reinit"))
return set_options(ctx, args);
else
return AVERROR(ENOSYS);
}
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,
.process_command = process_command,
.inputs = (const AVFilterPad[]) {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.start_frame = start_frame,
.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 }
},
.priv_class = &hue_class,
};
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