vf_unsharp.c
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1 /*
2  * Original copyright (c) 2002 Remi Guyomarch <rguyom@pobox.com>
3  * Port copyright (c) 2010 Daniel G. Taylor <dan@programmer-art.org>
4  * Relicensed to the LGPL with permission from Remi Guyomarch.
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
39 #include "avfilter.h"
40 #include "libavutil/common.h"
41 #include "libavutil/mem.h"
42 #include "libavutil/pixdesc.h"
43 
44 #define MIN_SIZE 3
45 #define MAX_SIZE 13
46 
47 /* right-shift and round-up */
48 #define SHIFTUP(x,shift) (-((-(x))>>(shift)))
49 
50 typedef struct FilterParam {
51  int msize_x;
52  int msize_y;
53  int amount;
54  int steps_x;
55  int steps_y;
56  int scalebits;
57  int32_t halfscale;
58  uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1];
59 } FilterParam;
60 
61 typedef struct {
64  int hsub, vsub;
66 
67 static void apply_unsharp( uint8_t *dst, int dst_stride,
68  const uint8_t *src, int src_stride,
69  int width, int height, FilterParam *fp)
70 {
71  uint32_t **sc = fp->sc;
72  uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;
73 
74  int32_t res;
75  int x, y, z;
76  const uint8_t *src2;
77 
78  if (!fp->amount) {
79  if (dst_stride == src_stride)
80  memcpy(dst, src, src_stride * height);
81  else
82  for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
83  memcpy(dst, src, width);
84  return;
85  }
86 
87  for (y = 0; y < 2 * fp->steps_y; y++)
88  memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
89 
90  for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
91  if (y < height)
92  src2 = src;
93 
94  memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
95  for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
96  tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
97  for (z = 0; z < fp->steps_x * 2; z += 2) {
98  tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
99  tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
100  }
101  for (z = 0; z < fp->steps_y * 2; z += 2) {
102  tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
103  tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
104  }
105  if (x >= fp->steps_x && y >= fp->steps_y) {
106  uint8_t* srx = src - fp->steps_y * src_stride + x - fp->steps_x;
107  uint8_t* dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
108 
109  res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
110  *dsx = av_clip_uint8(res);
111  }
112  }
113  if (y >= 0) {
114  dst += dst_stride;
115  src += src_stride;
116  }
117  }
118 }
119 
120 static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
121 {
122  fp->msize_x = msize_x;
123  fp->msize_y = msize_y;
124  fp->amount = amount * 65536.0;
125 
126  fp->steps_x = msize_x / 2;
127  fp->steps_y = msize_y / 2;
128  fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
129  fp->halfscale = 1 << (fp->scalebits - 1);
130 }
131 
132 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
133 {
134  UnsharpContext *unsharp = ctx->priv;
135  int lmsize_x = 5, cmsize_x = 5;
136  int lmsize_y = 5, cmsize_y = 5;
137  double lamount = 1.0f, camount = 0.0f;
138 
139  if (args)
140  sscanf(args, "%d:%d:%lf:%d:%d:%lf", &lmsize_x, &lmsize_y, &lamount,
141  &cmsize_x, &cmsize_y, &camount);
142 
143  if ((lamount && (lmsize_x < 2 || lmsize_y < 2)) ||
144  (camount && (cmsize_x < 2 || cmsize_y < 2))) {
145  av_log(ctx, AV_LOG_ERROR,
146  "Invalid value <2 for lmsize_x:%d or lmsize_y:%d or cmsize_x:%d or cmsize_y:%d\n",
147  lmsize_x, lmsize_y, cmsize_x, cmsize_y);
148  return AVERROR(EINVAL);
149  }
150 
151  set_filter_param(&unsharp->luma, lmsize_x, lmsize_y, lamount);
152  set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount);
153 
154  return 0;
155 }
156 
158 {
159  enum PixelFormat pix_fmts[] = {
163  };
164 
166 
167  return 0;
168 }
169 
170 static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
171 {
172  int z;
173  const char *effect;
174 
175  effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
176 
177  av_log(ctx, AV_LOG_INFO, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
178  effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
179 
180  for (z = 0; z < 2 * fp->steps_y; z++)
181  fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
182 }
183 
184 static int config_props(AVFilterLink *link)
185 {
186  UnsharpContext *unsharp = link->dst->priv;
187 
190 
191  init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
192  init_filter_param(link->dst, &unsharp->chroma, "chroma", SHIFTUP(link->w, unsharp->hsub));
193 
194  return 0;
195 }
196 
198 {
199  int z;
200 
201  for (z = 0; z < 2 * fp->steps_y; z++)
202  av_free(fp->sc[z]);
203 }
204 
205 static av_cold void uninit(AVFilterContext *ctx)
206 {
207  UnsharpContext *unsharp = ctx->priv;
208 
209  free_filter_param(&unsharp->luma);
210  free_filter_param(&unsharp->chroma);
211 }
212 
213 static void end_frame(AVFilterLink *link)
214 {
215  UnsharpContext *unsharp = link->dst->priv;
216  AVFilterBufferRef *in = link->cur_buf;
217  AVFilterBufferRef *out = link->dst->outputs[0]->out_buf;
218  int cw = SHIFTUP(link->w, unsharp->hsub);
219  int ch = SHIFTUP(link->h, unsharp->vsub);
220 
221  apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma);
222  apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw, ch, &unsharp->chroma);
223  apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw, ch, &unsharp->chroma);
224 
226  avfilter_draw_slice(link->dst->outputs[0], 0, link->h, 1);
227  avfilter_end_frame(link->dst->outputs[0]);
229 }
230 
231 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
232 {
233 }
234 
236  .name = "unsharp",
237  .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
238 
239  .priv_size = sizeof(UnsharpContext),
240 
241  .init = init,
242  .uninit = uninit,
244 
245  .inputs = (AVFilterPad[]) {{ .name = "default",
246  .type = AVMEDIA_TYPE_VIDEO,
247  .draw_slice = draw_slice,
248  .end_frame = end_frame,
249  .config_props = config_props,
250  .min_perms = AV_PERM_READ, },
251  { .name = NULL}},
252 
253  .outputs = (AVFilterPad[]) {{ .name = "default",
254  .type = AVMEDIA_TYPE_VIDEO, },
255  { .name = NULL}},
256 };