410 lines
14 KiB
C
410 lines
14 KiB
C
/*
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* Copyright (c) 2003 Michael Niedermayer
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* Copyright (c) 2012 Jeremy Tran
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Apply a hue/saturation filter to the input video
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* Ported from MPlayer libmpcodecs/vf_hue.c.
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*/
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#include <float.h>
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#include "libavutil/eval.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#define HUE_DEFAULT_VAL 0
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#define SAT_DEFAULT_VAL 1
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#define HUE_DEFAULT_VAL_STRING AV_STRINGIFY(HUE_DEFAULT_VAL)
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#define SAT_DEFAULT_VAL_STRING AV_STRINGIFY(SAT_DEFAULT_VAL)
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#define SAT_MIN_VAL -10
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#define SAT_MAX_VAL 10
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static const char *const var_names[] = {
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"n", // frame count
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"pts", // presentation timestamp expressed in AV_TIME_BASE units
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"r", // frame rate
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"t", // timestamp expressed in seconds
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"tb", // timebase
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NULL
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};
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enum var_name {
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VAR_N,
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VAR_PTS,
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VAR_R,
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VAR_T,
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VAR_TB,
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VAR_NB
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};
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typedef struct {
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const AVClass *class;
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float hue_deg; /* hue expressed in degrees */
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float hue; /* hue expressed in radians */
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char *hue_deg_expr;
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char *hue_expr;
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AVExpr *hue_deg_pexpr;
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AVExpr *hue_pexpr;
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float saturation;
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char *saturation_expr;
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AVExpr *saturation_pexpr;
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int hsub;
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int vsub;
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int32_t hue_sin;
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int32_t hue_cos;
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int flat_syntax;
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double var_values[VAR_NB];
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} HueContext;
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#define OFFSET(x) offsetof(HueContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption hue_options[] = {
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{ "h", "set the hue angle degrees expression", OFFSET(hue_deg_expr), AV_OPT_TYPE_STRING,
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{ .str = NULL }, .flags = FLAGS },
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{ "H", "set the hue angle radians expression", OFFSET(hue_expr), AV_OPT_TYPE_STRING,
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{ .str = NULL }, .flags = FLAGS },
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{ "s", "set the saturation expression", OFFSET(saturation_expr), AV_OPT_TYPE_STRING,
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{ .str = NULL }, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(hue);
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static inline void compute_sin_and_cos(HueContext *hue)
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{
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/*
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* Scale the value to the norm of the resulting (U,V) vector, that is
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* the saturation.
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* This will be useful in the process_chrominance function.
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*/
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hue->hue_sin = rint(sin(hue->hue) * (1 << 16) * hue->saturation);
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hue->hue_cos = rint(cos(hue->hue) * (1 << 16) * hue->saturation);
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}
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#define SET_EXPRESSION(attr, name) do { \
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if (hue->attr##_expr) { \
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if ((ret = av_expr_parse(&hue->attr##_pexpr, hue->attr##_expr, var_names, \
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NULL, NULL, NULL, NULL, 0, ctx)) < 0) { \
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av_log(ctx, AV_LOG_ERROR, \
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"Parsing failed for expression " #name "='%s'", \
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hue->attr##_expr); \
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hue->attr##_expr = old_##attr##_expr; \
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hue->attr##_pexpr = old_##attr##_pexpr; \
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return AVERROR(EINVAL); \
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} else if (old_##attr##_pexpr) { \
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av_freep(&old_##attr##_expr); \
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av_expr_free(old_##attr##_pexpr); \
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old_##attr##_pexpr = NULL; \
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} \
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} else { \
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hue->attr##_expr = old_##attr##_expr; \
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} \
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} while (0)
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static inline int set_options(AVFilterContext *ctx, const char *args)
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{
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HueContext *hue = ctx->priv;
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int n, ret;
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char c1 = 0, c2 = 0;
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char *old_hue_expr, *old_hue_deg_expr, *old_saturation_expr;
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AVExpr *old_hue_pexpr, *old_hue_deg_pexpr, *old_saturation_pexpr;
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if (args) {
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/* named options syntax */
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if (strchr(args, '=')) {
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old_hue_expr = hue->hue_expr;
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old_hue_deg_expr = hue->hue_deg_expr;
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old_saturation_expr = hue->saturation_expr;
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old_hue_pexpr = hue->hue_pexpr;
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old_hue_deg_pexpr = hue->hue_deg_pexpr;
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old_saturation_pexpr = hue->saturation_pexpr;
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hue->hue_expr = NULL;
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hue->hue_deg_expr = NULL;
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hue->saturation_expr = NULL;
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if ((ret = av_set_options_string(hue, args, "=", ":")) < 0)
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return ret;
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if (hue->hue_expr && hue->hue_deg_expr) {
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av_log(ctx, AV_LOG_ERROR,
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"H and h options are incompatible and cannot be specified "
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"at the same time\n");
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hue->hue_expr = old_hue_expr;
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hue->hue_deg_expr = old_hue_deg_expr;
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return AVERROR(EINVAL);
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}
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SET_EXPRESSION(hue_deg, h);
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SET_EXPRESSION(hue, H);
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SET_EXPRESSION(saturation, s);
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hue->flat_syntax = 0;
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av_log(ctx, AV_LOG_VERBOSE,
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"H_expr:%s h_deg_expr:%s s_expr:%s\n",
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hue->hue_expr, hue->hue_deg_expr, hue->saturation_expr);
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/* compatibility h:s syntax */
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} else {
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n = sscanf(args, "%f%c%f%c", &hue->hue_deg, &c1, &hue->saturation, &c2);
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if (n != 1 && (n != 3 || c1 != ':')) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid syntax for argument '%s': "
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"must be in the form 'hue[:saturation]'\n", args);
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return AVERROR(EINVAL);
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}
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if (hue->saturation < SAT_MIN_VAL || hue->saturation > SAT_MAX_VAL) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid value for saturation %0.1f: "
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"must be included between range %d and +%d\n",
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hue->saturation, SAT_MIN_VAL, SAT_MAX_VAL);
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return AVERROR(EINVAL);
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}
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hue->hue = hue->hue_deg * M_PI / 180;
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hue->flat_syntax = 1;
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av_log(ctx, AV_LOG_VERBOSE,
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"H:%0.1f h:%0.1f s:%0.1f\n",
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hue->hue, hue->hue_deg, hue->saturation);
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}
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}
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compute_sin_and_cos(hue);
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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HueContext *hue = ctx->priv;
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hue->class = &hue_class;
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av_opt_set_defaults(hue);
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hue->saturation = SAT_DEFAULT_VAL;
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hue->hue = HUE_DEFAULT_VAL;
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hue->hue_deg_pexpr = NULL;
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hue->hue_pexpr = NULL;
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hue->flat_syntax = 1;
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return set_options(ctx, args);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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HueContext *hue = ctx->priv;
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av_opt_free(hue);
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av_free(hue->hue_deg_expr);
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av_expr_free(hue->hue_deg_pexpr);
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av_free(hue->hue_expr);
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av_expr_free(hue->hue_pexpr);
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av_free(hue->saturation_expr);
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av_expr_free(hue->saturation_pexpr);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_props(AVFilterLink *inlink)
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{
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HueContext *hue = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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hue->hsub = desc->log2_chroma_w;
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hue->vsub = desc->log2_chroma_h;
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hue->var_values[VAR_N] = 0;
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hue->var_values[VAR_TB] = av_q2d(inlink->time_base);
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hue->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
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NAN : av_q2d(inlink->frame_rate);
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return 0;
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}
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static void process_chrominance(uint8_t *udst, uint8_t *vdst, const int dst_linesize,
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uint8_t *usrc, uint8_t *vsrc, const int src_linesize,
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int w, int h,
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const int32_t c, const int32_t s)
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{
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int32_t u, v, new_u, new_v;
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int i;
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/*
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* If we consider U and V as the components of a 2D vector then its angle
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* is the hue and the norm is the saturation
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*/
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while (h--) {
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for (i = 0; i < w; i++) {
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/* Normalize the components from range [16;140] to [-112;112] */
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u = usrc[i] - 128;
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v = vsrc[i] - 128;
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/*
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* Apply the rotation of the vector : (c * u) - (s * v)
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* (s * u) + (c * v)
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* De-normalize the components (without forgetting to scale 128
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* by << 16)
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* Finally scale back the result by >> 16
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*/
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new_u = ((c * u) - (s * v) + (1 << 15) + (128 << 16)) >> 16;
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new_v = ((s * u) + (c * v) + (1 << 15) + (128 << 16)) >> 16;
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/* Prevent a potential overflow */
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udst[i] = av_clip_uint8_c(new_u);
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vdst[i] = av_clip_uint8_c(new_v);
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}
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usrc += src_linesize;
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vsrc += src_linesize;
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udst += dst_linesize;
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vdst += dst_linesize;
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}
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}
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#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
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#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb))
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inpic)
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{
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HueContext *hue = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *outpic;
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outpic = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
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if (!outpic) {
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avfilter_unref_bufferp(&inpic);
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return AVERROR(ENOMEM);
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}
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avfilter_copy_buffer_ref_props(outpic, inpic);
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if (!hue->flat_syntax) {
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hue->var_values[VAR_T] = TS2T(inpic->pts, inlink->time_base);
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hue->var_values[VAR_PTS] = TS2D(inpic->pts);
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if (hue->saturation_expr) {
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hue->saturation = av_expr_eval(hue->saturation_pexpr, hue->var_values, NULL);
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if (hue->saturation < SAT_MIN_VAL || hue->saturation > SAT_MAX_VAL) {
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hue->saturation = av_clip(hue->saturation, SAT_MIN_VAL, SAT_MAX_VAL);
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av_log(inlink->dst, AV_LOG_WARNING,
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"Saturation value not in range [%d,%d]: clipping value to %0.1f\n",
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SAT_MIN_VAL, SAT_MAX_VAL, hue->saturation);
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}
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}
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if (hue->hue_deg_expr) {
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hue->hue_deg = av_expr_eval(hue->hue_deg_pexpr, hue->var_values, NULL);
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hue->hue = hue->hue_deg * M_PI / 180;
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} else if (hue->hue_expr) {
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hue->hue = av_expr_eval(hue->hue_pexpr, hue->var_values, NULL);
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}
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av_log(inlink->dst, AV_LOG_DEBUG,
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"H:%0.1f s:%0.f t:%0.1f n:%d\n",
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hue->hue, hue->saturation,
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hue->var_values[VAR_T], (int)hue->var_values[VAR_N]);
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compute_sin_and_cos(hue);
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}
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hue->var_values[VAR_N] += 1;
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av_image_copy_plane(outpic->data[0], outpic->linesize[0],
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inpic->data[0], inpic->linesize[0],
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inlink->w, inlink->h);
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process_chrominance(outpic->data[1], outpic->data[2], outpic->linesize[1],
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inpic->data[1], inpic->data[2], inpic->linesize[1],
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inlink->w >> hue->hsub, inlink->h >> hue->vsub,
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hue->hue_cos, hue->hue_sin);
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avfilter_unref_bufferp(&inpic);
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return ff_filter_frame(outlink, outpic);
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}
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
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char *res, int res_len, int flags)
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{
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if (!strcmp(cmd, "reinit"))
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return set_options(ctx, args);
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else
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return AVERROR(ENOSYS);
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}
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static const AVFilterPad hue_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_props,
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.min_perms = AV_PERM_READ,
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},
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{ NULL }
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};
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static const AVFilterPad hue_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_hue = {
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.name = "hue",
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.description = NULL_IF_CONFIG_SMALL("Adjust the hue and saturation of the input video."),
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.priv_size = sizeof(HueContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.process_command = process_command,
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.inputs = hue_inputs,
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.outputs = hue_outputs,
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.priv_class = &hue_class,
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};
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