mirror of https://git.ffmpeg.org/ffmpeg.git
232 lines
7.7 KiB
C
232 lines
7.7 KiB
C
/*
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* Copyright (C) 2007 Richard Spindler (author of frei0r plugin from which this was derived)
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* Copyright (C) 2014 Daniel Oberhoff
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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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 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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* Lenscorrection filter, algorithm from the frei0r plugin with the same name
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*/
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#include <stdlib.h>
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#include <math.h>
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#include "libavutil/opt.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "video.h"
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typedef struct LenscorrectionCtx {
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const AVClass *av_class;
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unsigned int width;
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unsigned int height;
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int hsub, vsub;
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int nb_planes;
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double cx, cy, k1, k2;
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int32_t *correction[4];
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} LenscorrectionCtx;
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption lenscorrection_options[] = {
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{ "cx", "set relative center x", offsetof(LenscorrectionCtx, cx), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, .flags=FLAGS },
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{ "cy", "set relative center y", offsetof(LenscorrectionCtx, cy), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, .flags=FLAGS },
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{ "k1", "set quadratic distortion factor", offsetof(LenscorrectionCtx, k1), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -1, 1, .flags=FLAGS },
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{ "k2", "set double quadratic distortion factor", offsetof(LenscorrectionCtx, k2), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -1, 1, .flags=FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(lenscorrection);
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typedef struct ThreadData {
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AVFrame *in, *out;
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int w, h;
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int plane;
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int xcenter, ycenter;
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int32_t *correction;
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} ThreadData;
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static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
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{
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ThreadData *td = (ThreadData*)arg;
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AVFrame *in = td->in;
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AVFrame *out = td->out;
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const int w = td->w, h = td->h;
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const int xcenter = td->xcenter;
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const int ycenter = td->ycenter;
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const int start = (h * job ) / nb_jobs;
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const int end = (h * (job+1)) / nb_jobs;
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const int plane = td->plane;
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const int inlinesize = in->linesize[plane];
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const int outlinesize = out->linesize[plane];
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const uint8_t *indata = in->data[plane];
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uint8_t *outrow = out->data[plane] + start * outlinesize;
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int i;
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for (i = start; i < end; i++, outrow += outlinesize) {
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const int off_y = i - ycenter;
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uint8_t *out = outrow;
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int j;
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for (j = 0; j < w; j++) {
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const int off_x = j - xcenter;
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const int64_t radius_mult = td->correction[j + i*w];
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const int x = xcenter + ((radius_mult * off_x + (1<<23))>>24);
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const int y = ycenter + ((radius_mult * off_y + (1<<23))>>24);
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const char isvalid = x > 0 && x < w - 1 && y > 0 && y < h - 1;
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*out++ = isvalid ? indata[y * inlinesize + x] : 0;
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}
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}
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return 0;
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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_YUV410P,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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LenscorrectionCtx *rect = ctx->priv;
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(rect->correction); i++) {
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av_freep(&rect->correction[i]);
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}
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}
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static int config_props(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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LenscorrectionCtx *rect = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
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rect->hsub = pixdesc->log2_chroma_w;
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rect->vsub = pixdesc->log2_chroma_h;
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outlink->w = rect->width = inlink->w;
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outlink->h = rect->height = inlink->h;
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rect->nb_planes = av_pix_fmt_count_planes(inlink->format);
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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LenscorrectionCtx *rect = (LenscorrectionCtx*)ctx->priv;
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AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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int plane;
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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for (plane = 0; plane < rect->nb_planes; ++plane) {
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int hsub = plane == 1 || plane == 2 ? rect->hsub : 0;
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int vsub = plane == 1 || plane == 2 ? rect->vsub : 0;
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int hdiv = 1 << hsub;
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int vdiv = 1 << vsub;
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int w = rect->width / hdiv;
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int h = rect->height / vdiv;
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int xcenter = rect->cx * w;
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int ycenter = rect->cy * h;
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int k1 = rect->k1 * (1<<24);
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int k2 = rect->k2 * (1<<24);
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ThreadData td = {
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.in = in,
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.out = out,
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.w = w,
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.h = h,
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.xcenter = xcenter,
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.ycenter = ycenter,
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.plane = plane};
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if (!rect->correction[plane]) {
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int i,j;
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const int64_t r2inv = (4LL<<60) / (w * w + h * h);
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rect->correction[plane] = av_malloc_array(w, h * sizeof(**rect->correction));
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if (!rect->correction[plane])
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return AVERROR(ENOMEM);
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for (j = 0; j < h; j++) {
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const int off_y = j - ycenter;
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const int off_y2 = off_y * off_y;
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for (i = 0; i < w; i++) {
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const int off_x = i - xcenter;
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const int64_t r2 = ((off_x * off_x + off_y2) * r2inv + (1LL<<31)) >> 32;
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const int64_t r4 = (r2 * r2 + (1<<27)) >> 28;
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const int radius_mult = (r2 * k1 + r4 * k2 + (1LL<<27) + (1LL<<52))>>28;
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rect->correction[plane][j * w + i] = radius_mult;
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}
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}
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}
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td.correction = rect->correction[plane];
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ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(h, ff_filter_get_nb_threads(ctx)));
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}
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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static const AVFilterPad lenscorrection_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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},
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{ NULL }
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};
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static const AVFilterPad lenscorrection_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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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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AVFilter ff_vf_lenscorrection = {
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.name = "lenscorrection",
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.description = NULL_IF_CONFIG_SMALL("Rectify the image by correcting for lens distortion."),
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.priv_size = sizeof(LenscorrectionCtx),
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.query_formats = query_formats,
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.inputs = lenscorrection_inputs,
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.outputs = lenscorrection_outputs,
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.priv_class = &lenscorrection_class,
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.uninit = uninit,
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.flags = AVFILTER_FLAG_SLICE_THREADS,
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};
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