FFmpeg: libavfilter/vf_unsharp.c Source File

FFmpeg
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 FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * blur / sharpen filter, ported to FFmpeg from MPlayer
26  * libmpcodecs/unsharp.c.
27  *
28  * This code is based on:
29  *
30  * An Efficient algorithm for Gaussian blur using finite-state machines
31  * Frederick M. Waltz and John W. V. Miller
32  *
33  * SPIE Conf. on Machine Vision Systems for Inspection and Metrology VII
34  * Originally published Boston, Nov 98
35  *
36  * http://www.engin.umd.umich.edu/~jwvm/ece581/21_GBlur.pdf
37  */
38 
39 #include "avfilter.h"
40 #include "formats.h"
41 #include "internal.h"
42 #include "video.h"
43 #include "libavutil/common.h"
44 #include "libavutil/imgutils.h"
45 #include "libavutil/mem.h"
46 #include "libavutil/opt.h"
47 #include "libavutil/pixdesc.h"
48 #include "unsharp.h"
49 #include "unsharp_opencl.h"
50 
51  static void apply_unsharp( uint8_t *dst, int dst_stride,
52  const uint8_t *src, int src_stride,
53  int width, int height, UnsharpFilterParam *fp)
54 {
55  uint32_t **sc = fp->sc;
56  uint32_t sr[MAX_MATRIX_SIZE - 1], tmp1, tmp2;
57 
58  int32_t res;
59  int x, y, z;
60  const uint8_t *src2 = NULL; //silence a warning
61  const int amount = fp->amount;
62  const int steps_x = fp->steps_x;
63  const int steps_y = fp->steps_y;
64  const int scalebits = fp->scalebits;
65  const int32_t halfscale = fp->halfscale;
66 
67  if (!amount) {
68  av_image_copy_plane(dst, dst_stride, src, src_stride, width, height);
69  return;
70  }
71 
72  for (y = 0; y < 2 * steps_y; y++)
73  memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * steps_x));
74 
75  for (y = -steps_y; y < height + steps_y; y++) {
76  if (y < height)
77  src2 = src;
78 
79  memset(sr, 0, sizeof(sr[0]) * (2 * steps_x - 1));
80  for (x = -steps_x; x < width + steps_x; x++) {
81  tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
82  for (z = 0; z < steps_x * 2; z += 2) {
83  tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
84  tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
85  }
86  for (z = 0; z < steps_y * 2; z += 2) {
87  tmp2 = sc[z + 0][x + steps_x] + tmp1; sc[z + 0][x + steps_x] = tmp1;
88  tmp1 = sc[z + 1][x + steps_x] + tmp2; sc[z + 1][x + steps_x] = tmp2;
89  }
90  if (x >= steps_x && y >= steps_y) {
91  const uint8_t *srx = src - steps_y * src_stride + x - steps_x;
92  uint8_t *dsx = dst - steps_y * dst_stride + x - steps_x;
93 
94  res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + halfscale) >> scalebits)) * amount) >> 16);
95  *dsx = av_clip_uint8(res);
96  }
97  }
98  if (y >= 0) {
99  dst += dst_stride;
100  src += src_stride;
101  }
102  }
103 }
104 
105  static int apply_unsharp_c(AVFilterContext *ctx, AVFrame *in, AVFrame *out)
106 {
107  AVFilterLink *inlink = ctx->inputs[0];
108  UnsharpContext *unsharp = ctx->priv;
109  int i, plane_w[3], plane_h[3];
110  UnsharpFilterParam *fp[3];
111  plane_w[0] = inlink->w;
112  plane_w[1] = plane_w[2] = FF_CEIL_RSHIFT(inlink->w, unsharp->hsub);
113  plane_h[0] = inlink->h;
114  plane_h[1] = plane_h[2] = FF_CEIL_RSHIFT(inlink->h, unsharp->vsub);
115  fp[0] = &unsharp->luma;
116  fp[1] = fp[2] = &unsharp->chroma;
117  for (i = 0; i < 3; i++) {
118  apply_unsharp(out->data[i], out->linesize[i], in->data[i], in->linesize[i], plane_w[i], plane_h[i], fp[i]);
119  }
120  return 0;
121 }
122 
123  static void set_filter_param(UnsharpFilterParam *fp, int msize_x, int msize_y, float amount)
124 {
125  fp->msize_x = msize_x;
126  fp->msize_y = msize_y;
127  fp->amount = amount * 65536.0;
128 
129  fp->steps_x = msize_x / 2;
130  fp->steps_y = msize_y / 2;
131  fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
132  fp->halfscale = 1 << (fp->scalebits - 1);
133 }
134 
135  static av_cold int init(AVFilterContext *ctx)
136 {
137  int ret = 0;
138  UnsharpContext *unsharp = ctx->priv;
139 
140 
141  set_filter_param(&unsharp->luma, unsharp->lmsize_x, unsharp->lmsize_y, unsharp->lamount);
142  set_filter_param(&unsharp->chroma, unsharp->cmsize_x, unsharp->cmsize_y, unsharp->camount);
143 
144  unsharp->apply_unsharp = apply_unsharp_c;
145  if (!CONFIG_OPENCL && unsharp->opencl) {
146  av_log(ctx, AV_LOG_ERROR, "OpenCL support was not enabled in this build, cannot be selected\n");
147  return AVERROR(EINVAL);
148  }
149  if (CONFIG_OPENCL && unsharp->opencl) {
150  unsharp->apply_unsharp = ff_opencl_apply_unsharp;
151  ret = ff_opencl_unsharp_init(ctx);
152  if (ret < 0)
153  return ret;
154  }
155  return 0;
156 }
157 
158  static int query_formats(AVFilterContext *ctx)
159 {
160  static const enum AVPixelFormat pix_fmts[] = {
161  AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P,
162  AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
163  AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE
164  };
165 
166  ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
167 
168  return 0;
169 }
170 
171  static int init_filter_param(AVFilterContext *ctx, UnsharpFilterParam *fp, const char *effect_type, int width)
172 {
173  int z;
174  const char *effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
175 
176  if (!(fp->msize_x & fp->msize_y & 1)) {
177  av_log(ctx, AV_LOG_ERROR,
178  "Invalid even size for %s matrix size %dx%d\n",
179  effect_type, fp->msize_x, fp->msize_y);
180  return AVERROR(EINVAL);
181  }
182 
183  av_log(ctx, AV_LOG_VERBOSE, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
184  effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
185 
186  for (z = 0; z < 2 * fp->steps_y; z++)
187  if (!(fp->sc[z] = av_malloc_array(width + 2 * fp->steps_x,
188  sizeof(*(fp->sc[z])))))
189  return AVERROR(ENOMEM);
190 
191  return 0;
192 }
193 
194  static int config_props(AVFilterLink *link)
195 {
196  UnsharpContext *unsharp = link->dst->priv;
197  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
198  int ret;
199 
200  unsharp->hsub = desc->log2_chroma_w;
201  unsharp->vsub = desc->log2_chroma_h;
202 
203  ret = init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
204  if (ret < 0)
205  return ret;
206  ret = init_filter_param(link->dst, &unsharp->chroma, "chroma", FF_CEIL_RSHIFT(link->w, unsharp->hsub));
207  if (ret < 0)
208  return ret;
209 
210  return 0;
211 }
212 
213  static void free_filter_param(UnsharpFilterParam *fp)
214 {
215  int z;
216 
217  for (z = 0; z < 2 * fp->steps_y; z++)
218  av_freep(&fp->sc[z]);
219 }
220 
221  static av_cold void uninit(AVFilterContext *ctx)
222 {
223  UnsharpContext *unsharp = ctx->priv;
224 
225  if (CONFIG_OPENCL && unsharp->opencl) {
226  ff_opencl_unsharp_uninit(ctx);
227  }
228 
229  free_filter_param(&unsharp->luma);
230  free_filter_param(&unsharp->chroma);
231 }
232 
233  static int filter_frame(AVFilterLink *link, AVFrame *in)
234 {
235  UnsharpContext *unsharp = link->dst->priv;
236  AVFilterLink *outlink = link->dst->outputs[0];
237  AVFrame *out;
238  int ret = 0;
239 
240  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
241  if (!out) {
242  av_frame_free(&in);
243  return AVERROR(ENOMEM);
244  }
245  av_frame_copy_props(out, in);
246  if (CONFIG_OPENCL && unsharp->opencl) {
247  ret = ff_opencl_unsharp_process_inout_buf(link->dst, in, out);
248  if (ret < 0)
249  goto end;
250  }
251 
252  ret = unsharp->apply_unsharp(link->dst, in, out);
253 end:
254  av_frame_free(&in);
255 
256  if (ret < 0)
257  return ret;
258  return ff_filter_frame(outlink, out);
259 }
260 
261  #define OFFSET(x) offsetof(UnsharpContext, x)
262  #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
263  #define MIN_SIZE 3
264  #define MAX_SIZE 63
265  static const AVOption unsharp_options[] = {
266  { "luma_msize_x", "set luma matrix horizontal size", OFFSET(lmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
267  { "lx", "set luma matrix horizontal size", OFFSET(lmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
268  { "luma_msize_y", "set luma matrix vertical size", OFFSET(lmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
269  { "ly", "set luma matrix vertical size", OFFSET(lmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
270  { "luma_amount", "set luma effect strength", OFFSET(lamount), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, -2, 5, FLAGS },
271  { "la", "set luma effect strength", OFFSET(lamount), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, -2, 5, FLAGS },
272  { "chroma_msize_x", "set chroma matrix horizontal size", OFFSET(cmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
273  { "cx", "set chroma matrix horizontal size", OFFSET(cmsize_x), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
274  { "chroma_msize_y", "set chroma matrix vertical size", OFFSET(cmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
275  { "cy", "set chroma matrix vertical size", OFFSET(cmsize_y), AV_OPT_TYPE_INT, { .i64 = 5 }, MIN_SIZE, MAX_SIZE, FLAGS },
276  { "chroma_amount", "set chroma effect strength", OFFSET(camount), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -2, 5, FLAGS },
277  { "ca", "set chroma effect strength", OFFSET(camount), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, -2, 5, FLAGS },
278  { "opencl", "use OpenCL filtering capabilities", OFFSET(opencl), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
279  { NULL }
280 };
281 
282 AVFILTER_DEFINE_CLASS(unsharp);
283 
284  static const AVFilterPad avfilter_vf_unsharp_inputs[] = {
285  {
286  .name = "default",
287  .type = AVMEDIA_TYPE_VIDEO,
288  .filter_frame = filter_frame,
289  .config_props = config_props,
290  },
291  { NULL }
292 };
293 
294  static const AVFilterPad avfilter_vf_unsharp_outputs[] = {
295  {
296  .name = "default",
297  .type = AVMEDIA_TYPE_VIDEO,
298  },
299  { NULL }
300 };
301 
302  AVFilter ff_vf_unsharp = {
303  .name = "unsharp",
304  .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
305  .priv_size = sizeof(UnsharpContext),
306  .priv_class = &unsharp_class,
307  .init = init,
308  .uninit = uninit,
309  .query_formats = query_formats,
310  .inputs = avfilter_vf_unsharp_inputs,
311  .outputs = avfilter_vf_unsharp_outputs,
312  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
313 };
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