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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 | }; |