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- /*
- * Copyright (C) 2007 Richard Spindler (author of frei0r plugin from which this was derived)
- * Copyright (C) 2014 Daniel Oberhoff
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- /**
- * @file
- * Lenscorrection filter, algorithm from the frei0r plugin with the same name
- */
- #include <stdlib.h>
- #include <math.h>
- #include "libavutil/opt.h"
- #include "libavutil/intreadwrite.h"
- #include "libavutil/pixdesc.h"
- #include "avfilter.h"
- #include "internal.h"
- #include "video.h"
- typedef struct LenscorrectionCtx {
- const AVClass *av_class;
- unsigned int width;
- unsigned int height;
- int hsub, vsub;
- int nb_planes;
- double cx, cy, k1, k2;
- int32_t *correction[4];
- } LenscorrectionCtx;
- #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
- static const AVOption lenscorrection_options[] = {
- { "cx", "set relative center x", offsetof(LenscorrectionCtx, cx), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, .flags=FLAGS },
- { "cy", "set relative center y", offsetof(LenscorrectionCtx, cy), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, .flags=FLAGS },
- { "k1", "set quadratic distortion factor", offsetof(LenscorrectionCtx, k1), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -1, 1, .flags=FLAGS },
- { "k2", "set double quadratic distortion factor", offsetof(LenscorrectionCtx, k2), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -1, 1, .flags=FLAGS },
- { NULL }
- };
- AVFILTER_DEFINE_CLASS(lenscorrection);
- typedef struct ThreadData {
- AVFrame *in, *out;
- int w, h;
- int plane;
- int xcenter, ycenter;
- int32_t *correction;
- } ThreadData;
- static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs)
- {
- ThreadData *td = (ThreadData*)arg;
- AVFrame *in = td->in;
- AVFrame *out = td->out;
- const int w = td->w, h = td->h;
- const int xcenter = td->xcenter;
- const int ycenter = td->ycenter;
- const int start = (h * job ) / nb_jobs;
- const int end = (h * (job+1)) / nb_jobs;
- const int plane = td->plane;
- const int inlinesize = in->linesize[plane];
- const int outlinesize = out->linesize[plane];
- const uint8_t *indata = in->data[plane];
- uint8_t *outrow = out->data[plane] + start * outlinesize;
- int i;
- for (i = start; i < end; i++, outrow += outlinesize) {
- const int off_y = i - ycenter;
- uint8_t *out = outrow;
- int j;
- for (j = 0; j < w; j++) {
- const int off_x = j - xcenter;
- const int64_t radius_mult = td->correction[j + i*w];
- const int x = xcenter + ((radius_mult * off_x + (1<<23))>>24);
- const int y = ycenter + ((radius_mult * off_y + (1<<23))>>24);
- const char isvalid = x > 0 && x < w - 1 && y > 0 && y < h - 1;
- *out++ = isvalid ? indata[y * inlinesize + x] : 0;
- }
- }
- return 0;
- }
- static int query_formats(AVFilterContext *ctx)
- {
- static const enum AVPixelFormat pix_fmts[] = {
- AV_PIX_FMT_YUV410P,
- AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
- AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
- AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA420P,
- AV_PIX_FMT_YUV422P,
- AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
- AV_PIX_FMT_NONE
- };
- AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
- if (!fmts_list)
- return AVERROR(ENOMEM);
- return ff_set_common_formats(ctx, fmts_list);
- }
- static av_cold void uninit(AVFilterContext *ctx)
- {
- LenscorrectionCtx *rect = ctx->priv;
- int i;
- for (i = 0; i < FF_ARRAY_ELEMS(rect->correction); i++) {
- av_freep(&rect->correction[i]);
- }
- }
- static int config_props(AVFilterLink *outlink)
- {
- AVFilterContext *ctx = outlink->src;
- LenscorrectionCtx *rect = ctx->priv;
- AVFilterLink *inlink = ctx->inputs[0];
- const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
- rect->hsub = pixdesc->log2_chroma_w;
- rect->vsub = pixdesc->log2_chroma_h;
- outlink->w = rect->width = inlink->w;
- outlink->h = rect->height = inlink->h;
- rect->nb_planes = av_pix_fmt_count_planes(inlink->format);
- return 0;
- }
- static int filter_frame(AVFilterLink *inlink, AVFrame *in)
- {
- AVFilterContext *ctx = inlink->dst;
- AVFilterLink *outlink = ctx->outputs[0];
- LenscorrectionCtx *rect = (LenscorrectionCtx*)ctx->priv;
- AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
- int plane;
- if (!out) {
- av_frame_free(&in);
- return AVERROR(ENOMEM);
- }
- av_frame_copy_props(out, in);
- for (plane = 0; plane < rect->nb_planes; ++plane) {
- int hsub = plane == 1 || plane == 2 ? rect->hsub : 0;
- int vsub = plane == 1 || plane == 2 ? rect->vsub : 0;
- int hdiv = 1 << hsub;
- int vdiv = 1 << vsub;
- int w = rect->width / hdiv;
- int h = rect->height / vdiv;
- int xcenter = rect->cx * w;
- int ycenter = rect->cy * h;
- int k1 = rect->k1 * (1<<24);
- int k2 = rect->k2 * (1<<24);
- ThreadData td = {
- .in = in,
- .out = out,
- .w = w,
- .h = h,
- .xcenter = xcenter,
- .ycenter = ycenter,
- .plane = plane};
- if (!rect->correction[plane]) {
- int i,j;
- const int64_t r2inv = (4LL<<60) / (w * w + h * h);
- rect->correction[plane] = av_malloc_array(w, h * sizeof(**rect->correction));
- if (!rect->correction[plane])
- return AVERROR(ENOMEM);
- for (j = 0; j < h; j++) {
- const int off_y = j - ycenter;
- const int off_y2 = off_y * off_y;
- for (i = 0; i < w; i++) {
- const int off_x = i - xcenter;
- const int64_t r2 = ((off_x * off_x + off_y2) * r2inv + (1LL<<31)) >> 32;
- const int64_t r4 = (r2 * r2 + (1<<27)) >> 28;
- const int radius_mult = (r2 * k1 + r4 * k2 + (1LL<<27) + (1LL<<52))>>28;
- rect->correction[plane][j * w + i] = radius_mult;
- }
- }
- }
- td.correction = rect->correction[plane];
- ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(h, ctx->graph->nb_threads));
- }
- av_frame_free(&in);
- return ff_filter_frame(outlink, out);
- }
- static const AVFilterPad lenscorrection_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .filter_frame = filter_frame,
- },
- { NULL }
- };
- static const AVFilterPad lenscorrection_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .config_props = config_props,
- },
- { NULL }
- };
- AVFilter ff_vf_lenscorrection = {
- .name = "lenscorrection",
- .description = NULL_IF_CONFIG_SMALL("Rectify the image by correcting for lens distortion."),
- .priv_size = sizeof(LenscorrectionCtx),
- .query_formats = query_formats,
- .inputs = lenscorrection_inputs,
- .outputs = lenscorrection_outputs,
- .priv_class = &lenscorrection_class,
- .uninit = uninit,
- .flags = AVFILTER_FLAG_SLICE_THREADS,
- };
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