7fe1ecefe1
Parse expression only when a new value is explicitly specified. In particular, avoid double free in case an old expression value is cached, it is set in the context, it is freed as the old value, and finally the pointer stored in the context is freed again when the filter is released.
430 lines
14 KiB
C
430 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 PixelFormat pix_fmts[] = {
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PIX_FMT_YUV444P, PIX_FMT_YUV422P,
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PIX_FMT_YUV420P, PIX_FMT_YUV411P,
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PIX_FMT_YUV410P, PIX_FMT_YUV440P,
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PIX_FMT_YUVA420P,
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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_descriptors[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 start_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 *buf_out;
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outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
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if (!outlink->out_buf)
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return AVERROR(ENOMEM);
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avfilter_copy_buffer_ref_props(outlink->out_buf, inpic);
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outlink->out_buf->video->w = outlink->w;
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outlink->out_buf->video->h = outlink->h;
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buf_out = avfilter_ref_buffer(outlink->out_buf, ~0);
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if (!buf_out)
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return AVERROR(ENOMEM);
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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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return ff_start_frame(outlink, buf_out);
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}
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static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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HueContext *hue = inlink->dst->priv;
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AVFilterBufferRef *inpic = inlink->cur_buf;
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AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
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uint8_t *inrow[3], *outrow[3]; // 0 : Y, 1 : U, 2 : V
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int plane;
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inrow[0] = inpic->data[0] + y * inpic->linesize[0];
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outrow[0] = outpic->data[0] + y * outpic->linesize[0];
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for (plane = 1; plane < 3; plane++) {
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inrow[plane] = inpic->data[plane] + (y >> hue->vsub) * inpic->linesize[plane];
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outrow[plane] = outpic->data[plane] + (y >> hue->vsub) * outpic->linesize[plane];
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}
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av_image_copy_plane(outrow[0], outpic->linesize[0],
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inrow[0], inpic->linesize[0],
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inlink->w, inlink->h);
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process_chrominance(outrow[1], outrow[2], outpic->linesize[1],
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inrow[1], inrow[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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return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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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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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 = (const AVFilterPad[]) {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.start_frame = start_frame,
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.draw_slice = draw_slice,
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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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{ .name = NULL }
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},
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.outputs = (const AVFilterPad[]) {
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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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{ .name = NULL }
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},
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.priv_class = &hue_class,
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};
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