Libav
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 "formats.h"
41 #include "internal.h"
42 #include "video.h"
43 #include "libavutil/common.h"
44 #include "libavutil/mem.h"
45 #include "libavutil/opt.h"
46 #include "libavutil/pixdesc.h"
47 
48 #define MIN_SIZE 3
49 #define MAX_SIZE 13
50 
51 /* right-shift and round-up */
52 #define SHIFTUP(x,shift) (-((-(x))>>(shift)))
53 
54 typedef struct FilterParam {
55  int msize_x;
56  int msize_y;
57  int amount;
58  int steps_x;
59  int steps_y;
60  int scalebits;
62  uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1];
63 } FilterParam;
64 
65 typedef struct {
66  const AVClass *class;
67  int lmsize_x, lmsize_y, cmsize_x, cmsize_y;
68  float lamount, camount;
71  int hsub, vsub;
73 
74 static void apply_unsharp( uint8_t *dst, int dst_stride,
75  const uint8_t *src, int src_stride,
76  int width, int height, FilterParam *fp)
77 {
78  uint32_t **sc = fp->sc;
79  uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;
80 
81  int32_t res;
82  int x, y, z;
83  const uint8_t *src2;
84 
85  if (!fp->amount) {
86  if (dst_stride == src_stride)
87  memcpy(dst, src, src_stride * height);
88  else
89  for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
90  memcpy(dst, src, width);
91  return;
92  }
93 
94  for (y = 0; y < 2 * fp->steps_y; y++)
95  memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
96 
97  for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
98  if (y < height)
99  src2 = src;
100 
101  memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
102  for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
103  tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
104  for (z = 0; z < fp->steps_x * 2; z += 2) {
105  tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
106  tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
107  }
108  for (z = 0; z < fp->steps_y * 2; z += 2) {
109  tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
110  tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
111  }
112  if (x >= fp->steps_x && y >= fp->steps_y) {
113  const uint8_t *srx = src - fp->steps_y * src_stride + x - fp->steps_x;
114  uint8_t *dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
115 
116  res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
117  *dsx = av_clip_uint8(res);
118  }
119  }
120  if (y >= 0) {
121  dst += dst_stride;
122  src += src_stride;
123  }
124  }
125 }
126 
127 static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, float amount)
128 {
129  fp->msize_x = msize_x;
130  fp->msize_y = msize_y;
131  fp->amount = amount * 65536.0;
132 
133  fp->steps_x = msize_x / 2;
134  fp->steps_y = msize_y / 2;
135  fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
136  fp->halfscale = 1 << (fp->scalebits - 1);
137 }
138 
139 static av_cold int init(AVFilterContext *ctx)
140 {
141  UnsharpContext *unsharp = ctx->priv;
142 
143  set_filter_param(&unsharp->luma, unsharp->lmsize_x, unsharp->lmsize_y, unsharp->lamount);
144  set_filter_param(&unsharp->chroma, unsharp->cmsize_x, unsharp->cmsize_y, unsharp->camount);
145 
146  return 0;
147 }
148 
150 {
151  enum AVPixelFormat pix_fmts[] = {
155  };
156 
158 
159  return 0;
160 }
161 
162 static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
163 {
164  int z;
165  const char *effect;
166 
167  effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
168 
169  av_log(ctx, AV_LOG_VERBOSE, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
170  effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
171 
172  for (z = 0; z < 2 * fp->steps_y; z++)
173  fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
174 }
175 
176 static int config_props(AVFilterLink *link)
177 {
178  UnsharpContext *unsharp = link->dst->priv;
179  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
180 
181  unsharp->hsub = desc->log2_chroma_w;
182  unsharp->vsub = desc->log2_chroma_h;
183 
184  init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
185  init_filter_param(link->dst, &unsharp->chroma, "chroma", SHIFTUP(link->w, unsharp->hsub));
186 
187  return 0;
188 }
189 
191 {
192  int z;
193 
194  for (z = 0; z < 2 * fp->steps_y; z++)
195  av_free(fp->sc[z]);
196 }
197 
198 static av_cold void uninit(AVFilterContext *ctx)
199 {
200  UnsharpContext *unsharp = ctx->priv;
201 
202  free_filter_param(&unsharp->luma);
203  free_filter_param(&unsharp->chroma);
204 }
205 
206 static int filter_frame(AVFilterLink *link, AVFrame *in)
207 {
208  UnsharpContext *unsharp = link->dst->priv;
209  AVFilterLink *outlink = link->dst->outputs[0];
210  AVFrame *out;
211  int cw = SHIFTUP(link->w, unsharp->hsub);
212  int ch = SHIFTUP(link->h, unsharp->vsub);
213 
214  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
215  if (!out) {
216  av_frame_free(&in);
217  return AVERROR(ENOMEM);
218  }
219  av_frame_copy_props(out, in);
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 
225  av_frame_free(&in);
226  return ff_filter_frame(outlink, out);
227 }
228 
229 #define OFFSET(x) offsetof(UnsharpContext, x)
230 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM
231 static const AVOption options[] = {
232  { "luma_msize_x", "luma matrix horizontal size", OFFSET(lmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
233  { "luma_msize_y", "luma matrix vertical size", OFFSET(lmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
234  { "luma_amount", "luma effect strength", OFFSET(lamount), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, -2, 5, FLAGS },
235  { "chroma_msize_x", "chroma matrix horizontal size", OFFSET(cmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
236  { "chroma_msize_y", "chroma matrix vertical size", OFFSET(cmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
237  { "chroma_amount", "chroma effect strength", OFFSET(camount), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -2, 5, FLAGS },
238  { NULL },
239 };
240 
241 static const AVClass unsharp_class = {
242  .class_name = "unsharp",
243  .item_name = av_default_item_name,
244  .option = options,
245  .version = LIBAVUTIL_VERSION_INT,
246 };
247 
249  {
250  .name = "default",
251  .type = AVMEDIA_TYPE_VIDEO,
252  .filter_frame = filter_frame,
253  .config_props = config_props,
254  },
255  { NULL }
256 };
257 
259  {
260  .name = "default",
261  .type = AVMEDIA_TYPE_VIDEO,
262  },
263  { NULL }
264 };
265 
267  .name = "unsharp",
268  .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
269 
270  .priv_size = sizeof(UnsharpContext),
271  .priv_class = &unsharp_class,
272 
273  .init = init,
274  .uninit = uninit,
276 
277  .inputs = avfilter_vf_unsharp_inputs,
278 
279  .outputs = avfilter_vf_unsharp_outputs,
280 };