mirror of
https://github.com/FFmpeg/FFmpeg.git
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253 lines
8.1 KiB
C
253 lines
8.1 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/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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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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float saturation;
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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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} HueContext;
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#define OFFSET(x) offsetof(HueContext, x)
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static const AVOption hue_options[] = {
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{ "h", "set the hue angle degrees", OFFSET(hue_deg), AV_OPT_TYPE_FLOAT,
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{ -FLT_MAX }, -FLT_MAX, FLT_MAX, AV_OPT_FLAG_VIDEO_PARAM },
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{ "H", "set the hue angle radians", OFFSET(hue), AV_OPT_TYPE_FLOAT,
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{ -FLT_MAX }, -FLT_MAX, FLT_MAX, AV_OPT_FLAG_VIDEO_PARAM },
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{ "s", "set the saturation value", OFFSET(saturation), AV_OPT_TYPE_FLOAT,
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{ SAT_DEFAULT_VAL }, -10, 10, AV_OPT_FLAG_VIDEO_PARAM },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(hue);
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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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int n, ret;
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char c1 = 0, c2 = 0;
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char *equal;
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hue->class = &hue_class;
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av_opt_set_defaults(hue);
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if (args) {
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/* named options syntax */
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if (equal = strchr(args, '=')) {
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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 != -FLT_MAX && hue->hue_deg != -FLT_MAX) {
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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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/* 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 < -10 || hue->saturation > 10) {
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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 -10 and +10\n", hue->saturation);
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return AVERROR(EINVAL);
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}
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}
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}
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if (hue->saturation == -FLT_MAX)
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hue->hue = SAT_DEFAULT_VAL;
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if (hue->hue == -FLT_MAX)
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hue->hue = HUE_DEFAULT_VAL;
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if (hue->hue_deg != -FLT_MAX)
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/* Convert angle from degrees to radians */
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hue->hue = hue->hue_deg * M_PI / 180;
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av_log(ctx, AV_LOG_VERBOSE, "hue:%f*PI hue_deg:%f saturation:%f\n",
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hue->hue/M_PI, hue->hue*180/M_PI, hue->saturation);
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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_opt_free(hue);
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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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/*
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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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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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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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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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.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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.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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};
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