| 1 | /* |
| 2 | * Copyright (C) 2007 Richard Spindler (author of frei0r plugin from which this was derived) |
| 3 | * Copyright (C) 2014 Daniel Oberhoff |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Lenscorrection filter, algorithm from the frei0r plugin with the same name |
| 25 | */ |
| 26 | #include <stdlib.h> |
| 27 | #include <math.h> |
| 28 | |
| 29 | #include "libavutil/opt.h" |
| 30 | #include "libavutil/intreadwrite.h" |
| 31 | #include "libavutil/pixdesc.h" |
| 32 | |
| 33 | #include "avfilter.h" |
| 34 | #include "internal.h" |
| 35 | #include "video.h" |
| 36 | |
| 37 | typedef struct LenscorrectionCtx { |
| 38 | const AVClass *av_class; |
| 39 | unsigned int width; |
| 40 | unsigned int height; |
| 41 | int hsub, vsub; |
| 42 | int nb_planes; |
| 43 | double cx, cy, k1, k2; |
| 44 | int32_t *correction[4]; |
| 45 | } LenscorrectionCtx; |
| 46 | |
| 47 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 48 | static const AVOption lenscorrection_options[] = { |
| 49 | { "cx", "set relative center x", offsetof(LenscorrectionCtx, cx), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, .flags=FLAGS }, |
| 50 | { "cy", "set relative center y", offsetof(LenscorrectionCtx, cy), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, .flags=FLAGS }, |
| 51 | { "k1", "set quadratic distortion factor", offsetof(LenscorrectionCtx, k1), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -1, 1, .flags=FLAGS }, |
| 52 | { "k2", "set double quadratic distortion factor", offsetof(LenscorrectionCtx, k2), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, -1, 1, .flags=FLAGS }, |
| 53 | { NULL } |
| 54 | }; |
| 55 | |
| 56 | AVFILTER_DEFINE_CLASS(lenscorrection); |
| 57 | |
| 58 | typedef struct ThreadData { |
| 59 | AVFrame *in, *out; |
| 60 | int w, h; |
| 61 | int plane; |
| 62 | int xcenter, ycenter; |
| 63 | int32_t *correction; |
| 64 | } ThreadData; |
| 65 | |
| 66 | static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs) |
| 67 | { |
| 68 | ThreadData *td = (ThreadData*)arg; |
| 69 | AVFrame *in = td->in; |
| 70 | AVFrame *out = td->out; |
| 71 | |
| 72 | const int w = td->w, h = td->h; |
| 73 | const int xcenter = td->xcenter; |
| 74 | const int ycenter = td->ycenter; |
| 75 | const int start = (h * job ) / nb_jobs; |
| 76 | const int end = (h * (job+1)) / nb_jobs; |
| 77 | const int plane = td->plane; |
| 78 | const int inlinesize = in->linesize[plane]; |
| 79 | const int outlinesize = out->linesize[plane]; |
| 80 | const uint8_t *indata = in->data[plane]; |
| 81 | uint8_t *outrow = out->data[plane] + start * outlinesize; |
| 82 | int i; |
| 83 | for (i = start; i < end; i++, outrow += outlinesize) { |
| 84 | const int off_y = i - ycenter; |
| 85 | uint8_t *out = outrow; |
| 86 | int j; |
| 87 | for (j = 0; j < w; j++) { |
| 88 | const int off_x = j - xcenter; |
| 89 | const int64_t radius_mult = td->correction[j + i*w]; |
| 90 | const int x = xcenter + ((radius_mult * off_x + (1<<23))>>24); |
| 91 | const int y = ycenter + ((radius_mult * off_y + (1<<23))>>24); |
| 92 | const char isvalid = x > 0 && x < w - 1 && y > 0 && y < h - 1; |
| 93 | *out++ = isvalid ? indata[y * inlinesize + x] : 0; |
| 94 | } |
| 95 | } |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | static int query_formats(AVFilterContext *ctx) |
| 100 | { |
| 101 | static const enum AVPixelFormat pix_fmts[] = { |
| 102 | AV_PIX_FMT_YUV410P, |
| 103 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, |
| 104 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P, |
| 105 | AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA420P, |
| 106 | AV_PIX_FMT_YUV422P, |
| 107 | AV_PIX_FMT_NONE |
| 108 | }; |
| 109 | |
| 110 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static av_cold void uninit(AVFilterContext *ctx) |
| 115 | { |
| 116 | LenscorrectionCtx *rect = ctx->priv; |
| 117 | int i; |
| 118 | |
| 119 | for (i = 0; i < FF_ARRAY_ELEMS(rect->correction); i++) { |
| 120 | av_freep(&rect->correction[i]); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | static int config_props(AVFilterLink *outlink) |
| 125 | { |
| 126 | AVFilterContext *ctx = outlink->src; |
| 127 | LenscorrectionCtx *rect = ctx->priv; |
| 128 | AVFilterLink *inlink = ctx->inputs[0]; |
| 129 | const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format); |
| 130 | rect->hsub = pixdesc->log2_chroma_w; |
| 131 | rect->vsub = pixdesc->log2_chroma_h; |
| 132 | outlink->w = rect->width = inlink->w; |
| 133 | outlink->h = rect->height = inlink->h; |
| 134 | rect->nb_planes = av_pix_fmt_count_planes(inlink->format); |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| 139 | { |
| 140 | AVFilterContext *ctx = inlink->dst; |
| 141 | AVFilterLink *outlink = ctx->outputs[0]; |
| 142 | LenscorrectionCtx *rect = (LenscorrectionCtx*)ctx->priv; |
| 143 | AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 144 | int plane; |
| 145 | |
| 146 | if (!out) { |
| 147 | av_frame_free(&in); |
| 148 | return AVERROR(ENOMEM); |
| 149 | } |
| 150 | |
| 151 | av_frame_copy_props(out, in); |
| 152 | |
| 153 | for (plane = 0; plane < rect->nb_planes; ++plane) { |
| 154 | int hsub = plane == 1 || plane == 2 ? rect->hsub : 0; |
| 155 | int vsub = plane == 1 || plane == 2 ? rect->vsub : 0; |
| 156 | int hdiv = 1 << hsub; |
| 157 | int vdiv = 1 << vsub; |
| 158 | int w = rect->width / hdiv; |
| 159 | int h = rect->height / vdiv; |
| 160 | int xcenter = rect->cx * w; |
| 161 | int ycenter = rect->cy * h; |
| 162 | int k1 = rect->k1 * (1<<24); |
| 163 | int k2 = rect->k2 * (1<<24); |
| 164 | ThreadData td = { |
| 165 | .in = in, |
| 166 | .out = out, |
| 167 | .w = w, |
| 168 | .h = h, |
| 169 | .xcenter = xcenter, |
| 170 | .ycenter = ycenter, |
| 171 | .plane = plane}; |
| 172 | |
| 173 | if (!rect->correction[plane]) { |
| 174 | int i,j; |
| 175 | const int64_t r2inv = (4LL<<60) / (w * w + h * h); |
| 176 | |
| 177 | rect->correction[plane] = av_malloc_array(w, h * sizeof(**rect->correction)); |
| 178 | if (!rect->correction[plane]) |
| 179 | return AVERROR(ENOMEM); |
| 180 | for (j = 0; j < h; j++) { |
| 181 | const int off_y = j - ycenter; |
| 182 | const int off_y2 = off_y * off_y; |
| 183 | for (i = 0; i < w; i++) { |
| 184 | const int off_x = i - xcenter; |
| 185 | const int64_t r2 = ((off_x * off_x + off_y2) * r2inv + (1LL<<31)) >> 32; |
| 186 | const int64_t r4 = (r2 * r2 + (1<<27)) >> 28; |
| 187 | const int radius_mult = (r2 * k1 + r4 * k2 + (1LL<<27) + (1LL<<52))>>28; |
| 188 | rect->correction[plane][j * w + i] = radius_mult; |
| 189 | } |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | td.correction = rect->correction[plane]; |
| 194 | ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(h, ctx->graph->nb_threads)); |
| 195 | } |
| 196 | |
| 197 | av_frame_free(&in); |
| 198 | return ff_filter_frame(outlink, out); |
| 199 | } |
| 200 | |
| 201 | static const AVFilterPad lenscorrection_inputs[] = { |
| 202 | { |
| 203 | .name = "default", |
| 204 | .type = AVMEDIA_TYPE_VIDEO, |
| 205 | .filter_frame = filter_frame, |
| 206 | }, |
| 207 | { NULL } |
| 208 | }; |
| 209 | |
| 210 | static const AVFilterPad lenscorrection_outputs[] = { |
| 211 | { |
| 212 | .name = "default", |
| 213 | .type = AVMEDIA_TYPE_VIDEO, |
| 214 | .config_props = config_props, |
| 215 | }, |
| 216 | { NULL } |
| 217 | }; |
| 218 | |
| 219 | AVFilter ff_vf_lenscorrection = { |
| 220 | .name = "lenscorrection", |
| 221 | .description = NULL_IF_CONFIG_SMALL("Rectify the image by correcting for lens distortion."), |
| 222 | .priv_size = sizeof(LenscorrectionCtx), |
| 223 | .query_formats = query_formats, |
| 224 | .inputs = lenscorrection_inputs, |
| 225 | .outputs = lenscorrection_outputs, |
| 226 | .priv_class = &lenscorrection_class, |
| 227 | .uninit = uninit, |
| 228 | .flags = AVFILTER_FLAG_SLICE_THREADS, |
| 229 | }; |