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vf_libopencv.c
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1 /*
2  * Copyright (c) 2010 Stefano Sabatini
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * libopencv wrapper functions
24  */
25 
26 /* #define DEBUG */
27 
28 #include <opencv/cv.h>
29 #include <opencv/cxcore.h>
30 #include "libavutil/avstring.h"
31 #include "libavutil/common.h"
32 #include "libavutil/file.h"
33 #include "avfilter.h"
34 #include "formats.h"
35 #include "internal.h"
36 #include "video.h"
37 
38 static void fill_iplimage_from_picref(IplImage *img, const AVFilterBufferRef *picref, enum AVPixelFormat pixfmt)
39 {
40  IplImage *tmpimg;
41  int depth, channels_nb;
42 
43  if (pixfmt == AV_PIX_FMT_GRAY8) { depth = IPL_DEPTH_8U; channels_nb = 1; }
44  else if (pixfmt == AV_PIX_FMT_BGRA) { depth = IPL_DEPTH_8U; channels_nb = 4; }
45  else if (pixfmt == AV_PIX_FMT_BGR24) { depth = IPL_DEPTH_8U; channels_nb = 3; }
46  else return;
47 
48  tmpimg = cvCreateImageHeader((CvSize){picref->video->w, picref->video->h}, depth, channels_nb);
49  *img = *tmpimg;
50  img->imageData = img->imageDataOrigin = picref->data[0];
51  img->dataOrder = IPL_DATA_ORDER_PIXEL;
52  img->origin = IPL_ORIGIN_TL;
53  img->widthStep = picref->linesize[0];
54 }
55 
56 static void fill_picref_from_iplimage(AVFilterBufferRef *picref, const IplImage *img, enum AVPixelFormat pixfmt)
57 {
58  picref->linesize[0] = img->widthStep;
59  picref->data[0] = img->imageData;
60 }
61 
63 {
64  static const enum AVPixelFormat pix_fmts[] = {
66  };
67 
69  return 0;
70 }
71 
72 typedef struct {
73  const char *name;
74  int (*init)(AVFilterContext *ctx, const char *args);
76  void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
77  void *priv;
78 } OCVContext;
79 
80 typedef struct {
81  int type;
82  int param1, param2;
83  double param3, param4;
85 
86 static av_cold int smooth_init(AVFilterContext *ctx, const char *args)
87 {
88  OCVContext *ocv = ctx->priv;
89  SmoothContext *smooth = ocv->priv;
90  char type_str[128] = "gaussian";
91 
92  smooth->param1 = 3;
93  smooth->param2 = 0;
94  smooth->param3 = 0.0;
95  smooth->param4 = 0.0;
96 
97  if (args)
98  sscanf(args, "%127[^:]:%d:%d:%lf:%lf", type_str, &smooth->param1, &smooth->param2, &smooth->param3, &smooth->param4);
99 
100  if (!strcmp(type_str, "blur" )) smooth->type = CV_BLUR;
101  else if (!strcmp(type_str, "blur_no_scale")) smooth->type = CV_BLUR_NO_SCALE;
102  else if (!strcmp(type_str, "median" )) smooth->type = CV_MEDIAN;
103  else if (!strcmp(type_str, "gaussian" )) smooth->type = CV_GAUSSIAN;
104  else if (!strcmp(type_str, "bilateral" )) smooth->type = CV_BILATERAL;
105  else {
106  av_log(ctx, AV_LOG_ERROR, "Smoothing type '%s' unknown.\n", type_str);
107  return AVERROR(EINVAL);
108  }
109 
110  if (smooth->param1 < 0 || !(smooth->param1%2)) {
111  av_log(ctx, AV_LOG_ERROR,
112  "Invalid value '%d' for param1, it has to be a positive odd number\n",
113  smooth->param1);
114  return AVERROR(EINVAL);
115  }
116  if ((smooth->type == CV_BLUR || smooth->type == CV_BLUR_NO_SCALE || smooth->type == CV_GAUSSIAN) &&
117  (smooth->param2 < 0 || (smooth->param2 && !(smooth->param2%2)))) {
118  av_log(ctx, AV_LOG_ERROR,
119  "Invalid value '%d' for param2, it has to be zero or a positive odd number\n",
120  smooth->param2);
121  return AVERROR(EINVAL);
122  }
123 
124  av_log(ctx, AV_LOG_VERBOSE, "type:%s param1:%d param2:%d param3:%f param4:%f\n",
125  type_str, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
126  return 0;
127 }
128 
129 static void smooth_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
130 {
131  OCVContext *ocv = ctx->priv;
132  SmoothContext *smooth = ocv->priv;
133  cvSmooth(inimg, outimg, smooth->type, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
134 }
135 
136 static int read_shape_from_file(int *cols, int *rows, int **values, const char *filename,
137  void *log_ctx)
138 {
139  uint8_t *buf, *p, *pend;
140  size_t size;
141  int ret, i, j, w;
142 
143  if ((ret = av_file_map(filename, &buf, &size, 0, log_ctx)) < 0)
144  return ret;
145 
146  /* prescan file to get the number of lines and the maximum width */
147  w = 0;
148  for (i = 0; i < size; i++) {
149  if (buf[i] == '\n') {
150  if (*rows == INT_MAX) {
151  av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of rows in the file\n");
152  return AVERROR_INVALIDDATA;
153  }
154  ++(*rows);
155  *cols = FFMAX(*cols, w);
156  w = 0;
157  } else if (w == INT_MAX) {
158  av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of columns in the file\n");
159  return AVERROR_INVALIDDATA;
160  }
161  w++;
162  }
163  if (*rows > (SIZE_MAX / sizeof(int) / *cols)) {
164  av_log(log_ctx, AV_LOG_ERROR, "File with size %dx%d is too big\n",
165  *rows, *cols);
166  return AVERROR_INVALIDDATA;
167  }
168  if (!(*values = av_mallocz(sizeof(int) * *rows * *cols)))
169  return AVERROR(ENOMEM);
170 
171  /* fill *values */
172  p = buf;
173  pend = buf + size-1;
174  for (i = 0; i < *rows; i++) {
175  for (j = 0;; j++) {
176  if (p > pend || *p == '\n') {
177  p++;
178  break;
179  } else
180  (*values)[*cols*i + j] = !!isgraph(*(p++));
181  }
182  }
183  av_file_unmap(buf, size);
184 
185 #ifdef DEBUG
186  {
187  char *line;
188  if (!(line = av_malloc(*cols + 1)))
189  return AVERROR(ENOMEM);
190  for (i = 0; i < *rows; i++) {
191  for (j = 0; j < *cols; j++)
192  line[j] = (*values)[i * *cols + j] ? '@' : ' ';
193  line[j] = 0;
194  av_log(log_ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
195  }
196  av_free(line);
197  }
198 #endif
199 
200  return 0;
201 }
202 
203 static int parse_iplconvkernel(IplConvKernel **kernel, char *buf, void *log_ctx)
204 {
205  char shape_filename[128] = "", shape_str[32] = "rect";
206  int cols = 0, rows = 0, anchor_x = 0, anchor_y = 0, shape = CV_SHAPE_RECT;
207  int *values = NULL, ret;
208 
209  sscanf(buf, "%dx%d+%dx%d/%32[^=]=%127s", &cols, &rows, &anchor_x, &anchor_y, shape_str, shape_filename);
210 
211  if (!strcmp(shape_str, "rect" )) shape = CV_SHAPE_RECT;
212  else if (!strcmp(shape_str, "cross" )) shape = CV_SHAPE_CROSS;
213  else if (!strcmp(shape_str, "ellipse")) shape = CV_SHAPE_ELLIPSE;
214  else if (!strcmp(shape_str, "custom" )) {
215  shape = CV_SHAPE_CUSTOM;
216  if ((ret = read_shape_from_file(&cols, &rows, &values, shape_filename, log_ctx)) < 0)
217  return ret;
218  } else {
219  av_log(log_ctx, AV_LOG_ERROR,
220  "Shape unspecified or type '%s' unknown.\n", shape_str);
221  return AVERROR(EINVAL);
222  }
223 
224  if (rows <= 0 || cols <= 0) {
225  av_log(log_ctx, AV_LOG_ERROR,
226  "Invalid non-positive values for shape size %dx%d\n", cols, rows);
227  return AVERROR(EINVAL);
228  }
229 
230  if (anchor_x < 0 || anchor_y < 0 || anchor_x >= cols || anchor_y >= rows) {
231  av_log(log_ctx, AV_LOG_ERROR,
232  "Shape anchor %dx%d is not inside the rectangle with size %dx%d.\n",
233  anchor_x, anchor_y, cols, rows);
234  return AVERROR(EINVAL);
235  }
236 
237  *kernel = cvCreateStructuringElementEx(cols, rows, anchor_x, anchor_y, shape, values);
238  av_freep(&values);
239  if (!*kernel)
240  return AVERROR(ENOMEM);
241 
242  av_log(log_ctx, AV_LOG_VERBOSE, "Structuring element: w:%d h:%d x:%d y:%d shape:%s\n",
243  rows, cols, anchor_x, anchor_y, shape_str);
244  return 0;
245 }
246 
247 typedef struct {
249  IplConvKernel *kernel;
250 } DilateContext;
251 
252 static av_cold int dilate_init(AVFilterContext *ctx, const char *args)
253 {
254  OCVContext *ocv = ctx->priv;
255  DilateContext *dilate = ocv->priv;
256  char default_kernel_str[] = "3x3+0x0/rect";
257  char *kernel_str;
258  const char *buf = args;
259  int ret;
260 
261  dilate->nb_iterations = 1;
262 
263  if (args)
264  kernel_str = av_get_token(&buf, ":");
265  if ((ret = parse_iplconvkernel(&dilate->kernel,
266  *kernel_str ? kernel_str : default_kernel_str,
267  ctx)) < 0)
268  return ret;
269  av_free(kernel_str);
270 
271  sscanf(buf, ":%d", &dilate->nb_iterations);
272  av_log(ctx, AV_LOG_VERBOSE, "iterations_nb:%d\n", dilate->nb_iterations);
273  if (dilate->nb_iterations <= 0) {
274  av_log(ctx, AV_LOG_ERROR, "Invalid non-positive value '%d' for nb_iterations\n",
275  dilate->nb_iterations);
276  return AVERROR(EINVAL);
277  }
278  return 0;
279 }
280 
282 {
283  OCVContext *ocv = ctx->priv;
284  DilateContext *dilate = ocv->priv;
285 
286  cvReleaseStructuringElement(&dilate->kernel);
287 }
288 
289 static void dilate_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
290 {
291  OCVContext *ocv = ctx->priv;
292  DilateContext *dilate = ocv->priv;
293  cvDilate(inimg, outimg, dilate->kernel, dilate->nb_iterations);
294 }
295 
296 static void erode_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
297 {
298  OCVContext *ocv = ctx->priv;
299  DilateContext *dilate = ocv->priv;
300  cvErode(inimg, outimg, dilate->kernel, dilate->nb_iterations);
301 }
302 
303 typedef struct {
304  const char *name;
305  size_t priv_size;
306  int (*init)(AVFilterContext *ctx, const char *args);
308  void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
310 
314  { "smooth", sizeof(SmoothContext), smooth_init, NULL, smooth_end_frame_filter },
315 };
316 
317 static av_cold int init(AVFilterContext *ctx, const char *args)
318 {
319  OCVContext *ocv = ctx->priv;
320  char name[128], priv_args[1024];
321  int i;
322  char c;
323 
324  sscanf(args, "%127[^=:]%c%1023s", name, &c, priv_args);
325 
326  for (i = 0; i < FF_ARRAY_ELEMS(ocv_filter_entries); i++) {
327  OCVFilterEntry *entry = &ocv_filter_entries[i];
328  if (!strcmp(name, entry->name)) {
329  ocv->name = entry->name;
330  ocv->init = entry->init;
331  ocv->uninit = entry->uninit;
332  ocv->end_frame_filter = entry->end_frame_filter;
333 
334  if (!(ocv->priv = av_mallocz(entry->priv_size)))
335  return AVERROR(ENOMEM);
336  return ocv->init(ctx, priv_args);
337  }
338  }
339 
340  av_log(ctx, AV_LOG_ERROR, "No libopencv filter named '%s'\n", name);
341  return AVERROR(EINVAL);
342 }
343 
344 static av_cold void uninit(AVFilterContext *ctx)
345 {
346  OCVContext *ocv = ctx->priv;
347 
348  if (ocv->uninit)
349  ocv->uninit(ctx);
350  av_free(ocv->priv);
351  memset(ocv, 0, sizeof(*ocv));
352 }
353 
355 {
356  AVFilterContext *ctx = inlink->dst;
357  OCVContext *ocv = ctx->priv;
358  AVFilterLink *outlink= inlink->dst->outputs[0];
359  AVFilterBufferRef *out;
360  IplImage inimg, outimg;
361 
362  out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
363  if (!out) {
365  return AVERROR(ENOMEM);
366  }
368 
369  fill_iplimage_from_picref(&inimg , in , inlink->format);
370  fill_iplimage_from_picref(&outimg, out, inlink->format);
371  ocv->end_frame_filter(ctx, &inimg, &outimg);
372  fill_picref_from_iplimage(out, &outimg, inlink->format);
373 
375 
376  return ff_filter_frame(outlink, out);
377 }
378 
380  {
381  .name = "default",
382  .type = AVMEDIA_TYPE_VIDEO,
383  .filter_frame = filter_frame,
384  .min_perms = AV_PERM_READ
385  },
386  { NULL }
387 };
388 
390  {
391  .name = "default",
392  .type = AVMEDIA_TYPE_VIDEO,
393  },
394  { NULL }
395 };
396 
398  .name = "ocv",
399  .description = NULL_IF_CONFIG_SMALL("Apply transform using libopencv."),
400 
401  .priv_size = sizeof(OCVContext),
402 
404  .init = init,
405  .uninit = uninit,
406 
407  .inputs = avfilter_vf_ocv_inputs,
408 
409  .outputs = avfilter_vf_ocv_outputs,
410 };