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/* |
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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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} 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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float w, h; |
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int plane; |
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float xcenter, ycenter; |
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float k1, k2; |
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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 float w = td->w, h = td->h; |
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const float xcenter = td->xcenter; |
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const float ycenter = td->ycenter; |
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const float r2inv = 4.0 / (w * w + h * h); |
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const float k1 = td->k1; |
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const float k2 = td->k2; |
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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 float off_y = i - ycenter; |
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const float off_y2 = off_y * off_y; |
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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 float off_x = j - xcenter; |
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const float r2 = (off_x * off_x + off_y2) * r2inv; |
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const float radius_mult = 1.0f + r2 * k1 + r2 * r2 * k2; |
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const int x = xcenter + radius_mult * off_x + 0.5f; |
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const int y = ycenter + radius_mult * off_y + 0.5f; |
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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 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_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 *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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float hdiv = 1 << hsub; |
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float vdiv = 1 << vsub; |
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float w = rect->width / hdiv; |
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float h = rect->height / vdiv; |
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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 = rect->cx * w, |
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.ycenter = rect->cy * h, |
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.k1 = rect->k1, |
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.k2 = rect->k2, |
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.plane = plane}; |
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ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(h, ctx->graph->nb_threads)); |
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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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.flags = AVFILTER_FLAG_SLICE_THREADS, |
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}; |