MrBesen
/
ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
ffmpeg/libavfilter/vf_lenscorrection.c

364 lines
17 KiB
C
Raw Permalink Blame History

/*
* 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/colorspace.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "internal.h"
#include "video.h"
typedef struct LenscorrectionCtx {
const AVClass *av_class;
int planewidth[4];
int planeheight[4];
int depth;
int nb_planes;
double cx, cy, k1, k2;
int interpolation;
uint8_t fill_rgba[4];
int fill_color[4];
int32_t *correction[4];
int (*filter_slice)(AVFilterContext *ctx, void *arg, int job, int nb_jobs, int plane);
} LenscorrectionCtx;
#define OFFSET(x) offsetof(LenscorrectionCtx, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption lenscorrection_options[] = {
{ "cx", "set relative center x", OFFSET(cx), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, .flags=FLAGS },
{ "cy", "set relative center y", OFFSET(cy), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, .flags=FLAGS },
{ "k1", "set quadratic distortion factor", OFFSET(k1), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -1, 1, .flags=FLAGS },
{ "k2", "set double quadratic distortion factor", OFFSET(k2), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -1, 1, .flags=FLAGS },
{ "i", "set interpolation type", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=0}, 0, 64, .flags=FLAGS, .unit = "i" },
{ "nearest", "nearest neighbour", 0, AV_OPT_TYPE_CONST, {.i64=0},0, 0, .flags=FLAGS, .unit = "i" },
{ "bilinear", "bilinear", 0, AV_OPT_TYPE_CONST, {.i64=1},0, 0, .flags=FLAGS, .unit = "i" },
{ "fc", "set the color of the unmapped pixels", OFFSET(fill_rgba), AV_OPT_TYPE_COLOR, {.str="black@0"}, .flags = FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(lenscorrection);
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
#define NEAREST(type, name) \
static int filter##name##_slice(AVFilterContext *ctx, void *arg, int job, \
int nb_jobs, int plane) \
{ \
LenscorrectionCtx *rect = ctx->priv; \
ThreadData *td = arg; \
AVFrame *in = td->in; \
AVFrame *out = td->out; \
\
const int32_t *correction = rect->correction[plane]; \
const int fill_color = rect->fill_color[plane]; \
const int w = rect->planewidth[plane], h = rect->planeheight[plane]; \
const int xcenter = rect->cx * w; \
const int ycenter = rect->cy * h; \
const int start = (h * job ) / nb_jobs; \
const int end = (h * (job+1)) / nb_jobs; \
const int inlinesize = in->linesize[plane] / sizeof(type); \
const int outlinesize = out->linesize[plane] / sizeof(type); \
const type *indata = (const type *)in->data[plane]; \
type *outrow = (type *)out->data[plane] + start * outlinesize; \
for (int i = start; i < end; i++, outrow += outlinesize) { \
const int off_y = i - ycenter; \
type *out = outrow; \
for (int j = 0; j < w; j++) { \
const int off_x = j - xcenter; \
const int64_t radius_mult = 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 && y >= 0 && y < h; \
*out++ = isvalid ? indata[y * inlinesize + x] : fill_color; \
} \
} \
return 0; \
}
NEAREST(uint8_t, 8)
NEAREST(uint16_t, 16)
#define BILINEAR(type, name) \
static int filter##name##_slice_bilinear(AVFilterContext *ctx, void *arg, \
int job, int nb_jobs, int plane) \
{ \
LenscorrectionCtx *rect = ctx->priv; \
ThreadData *td = arg; \
AVFrame *in = td->in; \
AVFrame *out = td->out; \
\
const int32_t *correction = rect->correction[plane]; \
const int fill_color = rect->fill_color[plane]; \
const int depth = rect->depth; \
const uint64_t max = (1 << 24) - 1; \
const uint64_t add = (1 << 23); \
const int w = rect->planewidth[plane], h = rect->planeheight[plane]; \
const int xcenter = rect->cx * w; \
const int ycenter = rect->cy * h; \
const int start = (h * job ) / nb_jobs; \
const int end = (h * (job+1)) / nb_jobs; \
const int inlinesize = in->linesize[plane] / sizeof(type); \
const int outlinesize = out->linesize[plane] / sizeof(type); \
const type *indata = (const type *)in->data[plane]; \
type *outrow = (type *)out->data[plane] + start * outlinesize; \
\
for (int i = start; i < end; i++, outrow += outlinesize) { \
const int off_y = i - ycenter; \
type *out = outrow; \
\
for (int j = 0; j < w; j++) { \
const int off_x = j - xcenter; \
const int64_t radius_mult = 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; \
\
if (isvalid) { \
const int nx = FFMIN(x + 1, w - 1); \
const int ny = FFMIN(y + 1, h - 1); \
const uint64_t du = off_x >= 0 ? (radius_mult * off_x + add) & max : max - ((radius_mult * -off_x + add) & max); \
const uint64_t dv = off_y >= 0 ? (radius_mult * off_y + add) & max : max - ((radius_mult * -off_y + add) & max); \
const uint64_t p0 = indata[ y * inlinesize + x]; \
const uint64_t p1 = indata[ y * inlinesize + nx]; \
const uint64_t p2 = indata[ny * inlinesize + x]; \
const uint64_t p3 = indata[ny * inlinesize + nx]; \
uint64_t sum = 0; \
\
sum += (max - du) * (max - dv) * p0; \
sum += ( du) * (max - dv) * p1; \
sum += (max - du) * ( dv) * p2; \
sum += ( du) * ( dv) * p3; \
\
out[j] = av_clip_uintp2_c((sum + (1ULL << 47)) >> 48, depth); \
} else { \
out[j] = fill_color; \
} \
} \
} \
\
return 0; \
}
BILINEAR(uint8_t, 8)
BILINEAR(uint16_t, 16)
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9,
AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
AV_PIX_FMT_GRAY16,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV440P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_NONE
};
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 void calc_correction(AVFilterContext *ctx, int plane)
{
LenscorrectionCtx *rect = ctx->priv;
int w = rect->planewidth[plane];
int h = rect->planeheight[plane];
int xcenter = rect->cx * w;
int ycenter = rect->cy * h;
int k1 = rect->k1 * (1<<24);
int k2 = rect->k2 * (1<<24);
const int64_t r2inv = (4LL<<60) / (w * w + h * h);
for (int j = 0; j < h; j++) {
const int off_y = j - ycenter;
const int off_y2 = off_y * off_y;
for (int 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;
}
}
}
static int config_output(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);
int is_rgb = !!(pixdesc->flags & AV_PIX_FMT_FLAG_RGB);
uint8_t rgba_map[4];
int factor;
ff_fill_rgba_map(rgba_map, inlink->format);
rect->depth = pixdesc->comp[0].depth;
factor = 1 << (rect->depth - 8);
rect->planeheight[1] = rect->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, pixdesc->log2_chroma_h);
rect->planeheight[0] = rect->planeheight[3] = inlink->h;
rect->planewidth[1] = rect->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, pixdesc->log2_chroma_w);
rect->planewidth[0] = rect->planewidth[3] = inlink->w;
rect->nb_planes = av_pix_fmt_count_planes(inlink->format);
rect->filter_slice = rect->depth <= 8 ? filter8_slice : filter16_slice;
if (rect->interpolation)
rect->filter_slice = rect->depth <= 8 ? filter8_slice_bilinear : filter16_slice_bilinear;
if (is_rgb) {
rect->fill_color[rgba_map[0]] = rect->fill_rgba[0] * factor;
rect->fill_color[rgba_map[1]] = rect->fill_rgba[1] * factor;
rect->fill_color[rgba_map[2]] = rect->fill_rgba[2] * factor;
rect->fill_color[rgba_map[3]] = rect->fill_rgba[3] * factor;
} else {
rect->fill_color[0] = RGB_TO_Y_BT709(rect->fill_rgba[0], rect->fill_rgba[1], rect->fill_rgba[2]) * factor;
rect->fill_color[1] = RGB_TO_U_BT709(rect->fill_rgba[0], rect->fill_rgba[1], rect->fill_rgba[2], 0) * factor;
rect->fill_color[2] = RGB_TO_V_BT709(rect->fill_rgba[0], rect->fill_rgba[1], rect->fill_rgba[2], 0) * factor;
rect->fill_color[3] = rect->fill_rgba[3] * factor;
}
for (int plane = 0; plane < rect->nb_planes; plane++) {
int w = rect->planewidth[plane];
int h = rect->planeheight[plane];
if (!rect->correction[plane])
rect->correction[plane] = av_malloc_array(w, h * sizeof(**rect->correction));
if (!rect->correction[plane])
return AVERROR(ENOMEM);
calc_correction(ctx, plane);
}
return 0;
}
static int filter_slice(AVFilterContext *ctx, void *arg, int job,
int nb_jobs)
{
LenscorrectionCtx *rect = ctx->priv;
for (int plane = 0; plane < rect->nb_planes; plane++)
rect->filter_slice(ctx, arg, job, nb_jobs, plane);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
LenscorrectionCtx *rect = ctx->priv;
AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
ThreadData td;
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
td.in = in; td.out = out;
ff_filter_execute(ctx, filter_slice, &td, NULL,
FFMIN(rect->planeheight[1], ff_filter_get_nb_threads(ctx)));
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int process_command(AVFilterContext *ctx,
const char *cmd,
const char *arg,
char *res,
int res_len,
int flags)
{
int ret = ff_filter_process_command(ctx, cmd, arg, res, res_len, flags);
if (ret < 0)
return ret;
return config_output(ctx->outputs[0]);
}
static const AVFilterPad lenscorrection_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad lenscorrection_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_lenscorrection = {
.name = "lenscorrection",
.description = NULL_IF_CONFIG_SMALL("Rectify the image by correcting for lens distortion."),
.priv_size = sizeof(LenscorrectionCtx),
FILTER_INPUTS(lenscorrection_inputs),
FILTER_OUTPUTS(lenscorrection_outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.priv_class = &lenscorrection_class,
.uninit = uninit,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = process_command,
};
Reference in New Issue View Git Blame Copy Permalink