mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
50e66726a2
This should fix several issues with odd dimensions inputs. lut, vflip, pad and crop video filters also need to be checked for such issues. It's possible sws is also affected.
378 lines
12 KiB
C
378 lines
12 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 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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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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{ "s", "set the saturation expression", OFFSET(saturation_expr), AV_OPT_TYPE_STRING,
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{ .str = "1" }, .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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{ 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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static int set_expr(AVExpr **pexpr_ptr, char **expr_ptr,
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const char *expr, const char *option, void *log_ctx)
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{
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int ret;
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AVExpr *new_pexpr;
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char *new_expr;
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new_expr = av_strdup(expr);
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if (!new_expr)
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return AVERROR(ENOMEM);
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ret = av_expr_parse(&new_pexpr, expr, var_names,
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NULL, NULL, NULL, NULL, 0, log_ctx);
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if (ret < 0) {
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av_log(log_ctx, AV_LOG_ERROR,
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"Error when evaluating the expression '%s' for %s\n",
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expr, option);
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av_free(new_expr);
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return ret;
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}
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if (*pexpr_ptr)
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av_expr_free(*pexpr_ptr);
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*pexpr_ptr = new_pexpr;
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av_freep(expr_ptr);
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*expr_ptr = new_expr;
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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HueContext *hue = ctx->priv;
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int 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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return AVERROR(EINVAL);
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}
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#define SET_EXPR(expr, option) \
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if (hue->expr##_expr) do { \
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ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \
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hue->expr##_expr, option, ctx); \
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if (ret < 0) \
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return ret; \
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} while (0)
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SET_EXPR(saturation, "s");
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SET_EXPR(hue_deg, "h");
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SET_EXPR(hue, "H");
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#undef SET_EXPR
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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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compute_sin_and_cos(hue);
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return 0;
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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_expr_free(hue->hue_deg_pexpr);
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av_expr_free(hue->hue_pexpr);
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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_YUVA444P, AV_PIX_FMT_YUVA422P,
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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, AVFrame *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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AVFrame *outpic;
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int direct = 0;
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if (av_frame_is_writable(inpic)) {
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direct = 1;
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outpic = inpic;
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} else {
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outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!outpic) {
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av_frame_free(&inpic);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(outpic, inpic);
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}
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hue->var_values[VAR_N] = inlink->frame_count;
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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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hue->hue_deg = hue->hue * 180 / M_PI;
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}
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av_log(inlink->dst, AV_LOG_DEBUG,
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"H:%0.1f*PI h:%0.1f s:%0.f t:%0.1f n:%d\n",
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hue->hue/M_PI, hue->hue_deg, 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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if (!direct) {
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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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if (inpic->data[3])
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av_image_copy_plane(outpic->data[3], outpic->linesize[3],
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inpic->data[3], inpic->linesize[3],
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inlink->w, inlink->h);
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}
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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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FF_CEIL_RSHIFT(inlink->w, hue->hsub),
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FF_CEIL_RSHIFT(inlink->h, hue->vsub),
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hue->hue_cos, hue->hue_sin);
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if (!direct)
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av_frame_free(&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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HueContext *hue = ctx->priv;
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int ret;
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#define SET_EXPR(expr, option) \
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do { \
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ret = set_expr(&hue->expr##_pexpr, &hue->expr##_expr, \
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args, option, ctx); \
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if (ret < 0) \
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return ret; \
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} while (0)
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if (!strcmp(cmd, "h")) {
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SET_EXPR(hue_deg, "h");
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av_freep(&hue->hue_expr);
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} else if (!strcmp(cmd, "H")) {
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SET_EXPR(hue, "H");
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av_freep(&hue->hue_deg_expr);
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} else if (!strcmp(cmd, "s")) {
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SET_EXPR(saturation, "s");
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} else
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return AVERROR(ENOSYS);
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return 0;
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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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},
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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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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE,
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};
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