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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 #include <opencv/cv.h>
27 #include <opencv/cxcore.h>
28 #include "libavutil/avstring.h"
29 #include "libavutil/common.h"
30 #include "libavutil/file.h"
31 #include "libavutil/opt.h"
32 #include "avfilter.h"
33 #include "formats.h"
34 #include "internal.h"
35 #include "video.h"
36 
37 static void fill_iplimage_from_frame(IplImage *img, const AVFrame *frame, enum AVPixelFormat pixfmt)
38 {
39  IplImage *tmpimg;
40  int depth, channels_nb;
41 
42  if (pixfmt == AV_PIX_FMT_GRAY8) { depth = IPL_DEPTH_8U; channels_nb = 1; }
43  else if (pixfmt == AV_PIX_FMT_BGRA) { depth = IPL_DEPTH_8U; channels_nb = 4; }
44  else if (pixfmt == AV_PIX_FMT_BGR24) { depth = IPL_DEPTH_8U; channels_nb = 3; }
45  else return;
46 
47  tmpimg = cvCreateImageHeader((CvSize){frame->width, frame->height}, depth, channels_nb);
48  *img = *tmpimg;
49  img->imageData = img->imageDataOrigin = frame->data[0];
50  img->dataOrder = IPL_DATA_ORDER_PIXEL;
51  img->origin = IPL_ORIGIN_TL;
52  img->widthStep = frame->linesize[0];
53 }
54 
55 static void fill_frame_from_iplimage(AVFrame *frame, const IplImage *img, enum AVPixelFormat pixfmt)
56 {
57  frame->linesize[0] = img->widthStep;
58  frame->data[0] = img->imageData;
59 }
60 
62 {
63  static const enum AVPixelFormat pix_fmts[] = {
65  };
66 
68  return 0;
69 }
70 
71 typedef struct OCVContext {
72  const AVClass *class;
73  char *name;
74  char *params;
75  int (*init)(AVFilterContext *ctx, const char *args);
77  void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
78  void *priv;
79 } OCVContext;
80 
81 typedef struct SmoothContext {
82  int type;
83  int param1, param2;
84  double param3, param4;
86 
87 static av_cold int smooth_init(AVFilterContext *ctx, const char *args)
88 {
89  OCVContext *s = ctx->priv;
90  SmoothContext *smooth = s->priv;
91  char type_str[128] = "gaussian";
92 
93  smooth->param1 = 3;
94  smooth->param2 = 0;
95  smooth->param3 = 0.0;
96  smooth->param4 = 0.0;
97 
98  if (args)
99  sscanf(args, "%127[^|]|%d|%d|%lf|%lf", type_str, &smooth->param1, &smooth->param2, &smooth->param3, &smooth->param4);
100 
101  if (!strcmp(type_str, "blur" )) smooth->type = CV_BLUR;
102  else if (!strcmp(type_str, "blur_no_scale")) smooth->type = CV_BLUR_NO_SCALE;
103  else if (!strcmp(type_str, "median" )) smooth->type = CV_MEDIAN;
104  else if (!strcmp(type_str, "gaussian" )) smooth->type = CV_GAUSSIAN;
105  else if (!strcmp(type_str, "bilateral" )) smooth->type = CV_BILATERAL;
106  else {
107  av_log(ctx, AV_LOG_ERROR, "Smoothing type '%s' unknown.\n", type_str);
108  return AVERROR(EINVAL);
109  }
110 
111  if (smooth->param1 < 0 || !(smooth->param1%2)) {
112  av_log(ctx, AV_LOG_ERROR,
113  "Invalid value '%d' for param1, it has to be a positive odd number\n",
114  smooth->param1);
115  return AVERROR(EINVAL);
116  }
117  if ((smooth->type == CV_BLUR || smooth->type == CV_BLUR_NO_SCALE || smooth->type == CV_GAUSSIAN) &&
118  (smooth->param2 < 0 || (smooth->param2 && !(smooth->param2%2)))) {
119  av_log(ctx, AV_LOG_ERROR,
120  "Invalid value '%d' for param2, it has to be zero or a positive odd number\n",
121  smooth->param2);
122  return AVERROR(EINVAL);
123  }
124 
125  av_log(ctx, AV_LOG_VERBOSE, "type:%s param1:%d param2:%d param3:%f param4:%f\n",
126  type_str, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
127  return 0;
128 }
129 
130 static void smooth_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
131 {
132  OCVContext *s = ctx->priv;
133  SmoothContext *smooth = s->priv;
134  cvSmooth(inimg, outimg, smooth->type, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
135 }
136 
137 static int read_shape_from_file(int *cols, int *rows, int **values, const char *filename,
138  void *log_ctx)
139 {
140  uint8_t *buf, *p, *pend;
141  size_t size;
142  int ret, i, j, w;
143 
144  if ((ret = av_file_map(filename, &buf, &size, 0, log_ctx)) < 0)
145  return ret;
146 
147  /* prescan file to get the number of lines and the maximum width */
148  w = 0;
149  for (i = 0; i < size; i++) {
150  if (buf[i] == '\n') {
151  if (*rows == INT_MAX) {
152  av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of rows in the file\n");
153  return AVERROR_INVALIDDATA;
154  }
155  ++(*rows);
156  *cols = FFMAX(*cols, w);
157  w = 0;
158  } else if (w == INT_MAX) {
159  av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of columns in the file\n");
160  return AVERROR_INVALIDDATA;
161  }
162  w++;
163  }
164  if (*rows > (SIZE_MAX / sizeof(int) / *cols)) {
165  av_log(log_ctx, AV_LOG_ERROR, "File with size %dx%d is too big\n",
166  *rows, *cols);
167  return AVERROR_INVALIDDATA;
168  }
169  if (!(*values = av_mallocz_array(sizeof(int) * *rows, *cols)))
170  return AVERROR(ENOMEM);
171 
172  /* fill *values */
173  p = buf;
174  pend = buf + size-1;
175  for (i = 0; i < *rows; i++) {
176  for (j = 0;; j++) {
177  if (p > pend || *p == '\n') {
178  p++;
179  break;
180  } else
181  (*values)[*cols*i + j] = !!av_isgraph(*(p++));
182  }
183  }
184  av_file_unmap(buf, size);
185 
186 #ifdef DEBUG
187  {
188  char *line;
189  if (!(line = av_malloc(*cols + 1)))
190  return AVERROR(ENOMEM);
191  for (i = 0; i < *rows; i++) {
192  for (j = 0; j < *cols; j++)
193  line[j] = (*values)[i * *cols + j] ? '@' : ' ';
194  line[j] = 0;
195  av_log(log_ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
196  }
197  av_free(line);
198  }
199 #endif
200 
201  return 0;
202 }
203 
204 static int parse_iplconvkernel(IplConvKernel **kernel, char *buf, void *log_ctx)
205 {
206  char shape_filename[128] = "", shape_str[32] = "rect";
207  int cols = 0, rows = 0, anchor_x = 0, anchor_y = 0, shape = CV_SHAPE_RECT;
208  int *values = NULL, ret;
209 
210  sscanf(buf, "%dx%d+%dx%d/%32[^=]=%127s", &cols, &rows, &anchor_x, &anchor_y, shape_str, shape_filename);
211 
212  if (!strcmp(shape_str, "rect" )) shape = CV_SHAPE_RECT;
213  else if (!strcmp(shape_str, "cross" )) shape = CV_SHAPE_CROSS;
214  else if (!strcmp(shape_str, "ellipse")) shape = CV_SHAPE_ELLIPSE;
215  else if (!strcmp(shape_str, "custom" )) {
216  shape = CV_SHAPE_CUSTOM;
217  if ((ret = read_shape_from_file(&cols, &rows, &values, shape_filename, log_ctx)) < 0)
218  return ret;
219  } else {
220  av_log(log_ctx, AV_LOG_ERROR,
221  "Shape unspecified or type '%s' unknown.\n", shape_str);
222  return AVERROR(EINVAL);
223  }
224 
225  if (rows <= 0 || cols <= 0) {
226  av_log(log_ctx, AV_LOG_ERROR,
227  "Invalid non-positive values for shape size %dx%d\n", cols, rows);
228  return AVERROR(EINVAL);
229  }
230 
231  if (anchor_x < 0 || anchor_y < 0 || anchor_x >= cols || anchor_y >= rows) {
232  av_log(log_ctx, AV_LOG_ERROR,
233  "Shape anchor %dx%d is not inside the rectangle with size %dx%d.\n",
234  anchor_x, anchor_y, cols, rows);
235  return AVERROR(EINVAL);
236  }
237 
238  *kernel = cvCreateStructuringElementEx(cols, rows, anchor_x, anchor_y, shape, values);
239  av_freep(&values);
240  if (!*kernel)
241  return AVERROR(ENOMEM);
242 
243  av_log(log_ctx, AV_LOG_VERBOSE, "Structuring element: w:%d h:%d x:%d y:%d shape:%s\n",
244  rows, cols, anchor_x, anchor_y, shape_str);
245  return 0;
246 }
247 
248 typedef struct DilateContext {
250  IplConvKernel *kernel;
251 } DilateContext;
252 
253 static av_cold int dilate_init(AVFilterContext *ctx, const char *args)
254 {
255  OCVContext *s = ctx->priv;
256  DilateContext *dilate = s->priv;
257  char default_kernel_str[] = "3x3+0x0/rect";
258  char *kernel_str;
259  const char *buf = args;
260  int ret;
261 
262  if (args)
263  kernel_str = av_get_token(&buf, "|");
264  else
265  kernel_str = av_strdup(default_kernel_str);
266  if (!kernel_str)
267  return AVERROR(ENOMEM);
268  if ((ret = parse_iplconvkernel(&dilate->kernel, kernel_str, ctx)) < 0)
269  return ret;
270  av_free(kernel_str);
271 
272  if (!buf || sscanf(buf, "|%d", &dilate->nb_iterations) != 1)
273  dilate->nb_iterations = 1;
274  av_log(ctx, AV_LOG_VERBOSE, "iterations_nb:%d\n", dilate->nb_iterations);
275  if (dilate->nb_iterations <= 0) {
276  av_log(ctx, AV_LOG_ERROR, "Invalid non-positive value '%d' for nb_iterations\n",
277  dilate->nb_iterations);
278  return AVERROR(EINVAL);
279  }
280  return 0;
281 }
282 
284 {
285  OCVContext *s = ctx->priv;
286  DilateContext *dilate = s->priv;
287 
288  cvReleaseStructuringElement(&dilate->kernel);
289 }
290 
291 static void dilate_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
292 {
293  OCVContext *s = ctx->priv;
294  DilateContext *dilate = s->priv;
295  cvDilate(inimg, outimg, dilate->kernel, dilate->nb_iterations);
296 }
297 
298 static void erode_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
299 {
300  OCVContext *s = ctx->priv;
301  DilateContext *dilate = s->priv;
302  cvErode(inimg, outimg, dilate->kernel, dilate->nb_iterations);
303 }
304 
305 typedef struct OCVFilterEntry {
306  const char *name;
307  size_t priv_size;
308  int (*init)(AVFilterContext *ctx, const char *args);
310  void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
312 
316  { "smooth", sizeof(SmoothContext), smooth_init, NULL, smooth_end_frame_filter },
317 };
318 
319 static av_cold int init(AVFilterContext *ctx)
320 {
321  OCVContext *s = ctx->priv;
322  int i;
323 
324  if (!s->name) {
325  av_log(ctx, AV_LOG_ERROR, "No libopencv filter name specified\n");
326  return AVERROR(EINVAL);
327  }
328  for (i = 0; i < FF_ARRAY_ELEMS(ocv_filter_entries); i++) {
329  OCVFilterEntry *entry = &ocv_filter_entries[i];
330  if (!strcmp(s->name, entry->name)) {
331  s->init = entry->init;
332  s->uninit = entry->uninit;
334 
335  if (!(s->priv = av_mallocz(entry->priv_size)))
336  return AVERROR(ENOMEM);
337  return s->init(ctx, s->params);
338  }
339  }
340 
341  av_log(ctx, AV_LOG_ERROR, "No libopencv filter named '%s'\n", s->name);
342  return AVERROR(EINVAL);
343 }
344 
345 static av_cold void uninit(AVFilterContext *ctx)
346 {
347  OCVContext *s = ctx->priv;
348 
349  if (s->uninit)
350  s->uninit(ctx);
351  av_freep(&s->priv);
352 }
353 
354 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
355 {
356  AVFilterContext *ctx = inlink->dst;
357  OCVContext *s = ctx->priv;
358  AVFilterLink *outlink= inlink->dst->outputs[0];
359  AVFrame *out;
360  IplImage inimg, outimg;
361 
362  out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
363  if (!out) {
364  av_frame_free(&in);
365  return AVERROR(ENOMEM);
366  }
367  av_frame_copy_props(out, in);
368 
369  fill_iplimage_from_frame(&inimg , in , inlink->format);
370  fill_iplimage_from_frame(&outimg, out, inlink->format);
371  s->end_frame_filter(ctx, &inimg, &outimg);
372  fill_frame_from_iplimage(out, &outimg, inlink->format);
373 
374  av_frame_free(&in);
375 
376  return ff_filter_frame(outlink, out);
377 }
378 
379 #define OFFSET(x) offsetof(OCVContext, x)
380 #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
381 static const AVOption ocv_options[] = {
382  { "filter_name", NULL, OFFSET(name), AV_OPT_TYPE_STRING, .flags = FLAGS },
383  { "filter_params", NULL, OFFSET(params), AV_OPT_TYPE_STRING, .flags = FLAGS },
384  { NULL }
385 };
386 
388 
390  {
391  .name = "default",
392  .type = AVMEDIA_TYPE_VIDEO,
393  .filter_frame = filter_frame,
394  },
395  { NULL }
396 };
397 
399  {
400  .name = "default",
401  .type = AVMEDIA_TYPE_VIDEO,
402  },
403  { NULL }
404 };
405 
407  .name = "ocv",
408  .description = NULL_IF_CONFIG_SMALL("Apply transform using libopencv."),
409  .priv_size = sizeof(OCVContext),
410  .priv_class = &ocv_class,
412  .init = init,
413  .uninit = uninit,
414  .inputs = avfilter_vf_ocv_inputs,
415  .outputs = avfilter_vf_ocv_outputs,
416 };