diff options
Diffstat (limited to 'libavfilter/vf_lenscorrection.c')
| -rw-r--r-- | libavfilter/vf_lenscorrection.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/libavfilter/vf_lenscorrection.c b/libavfilter/vf_lenscorrection.c new file mode 100644 index 0000000000..9db483dd36 --- /dev/null +++ b/libavfilter/vf_lenscorrection.c @@ -0,0 +1,231 @@ +/* + * 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, +}; |