mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-25 19:01:51 +02:00
232 lines
7.7 KiB
C
232 lines
7.7 KiB
C
/*
|
|
* 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, ff_filter_get_nb_threads(ctx)));
|
|
}
|
|
|
|
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,
|
|
};
|