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path: root/libavfilter/vf_libopencv.c (plain)
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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 "config.h"
27#if HAVE_OPENCV2_CORE_CORE_C_H
28#include <opencv2/core/core_c.h>
29#include <opencv2/imgproc/imgproc_c.h>
30#else
31#include <opencv/cv.h>
32#include <opencv/cxcore.h>
33#endif
34#include "libavutil/avstring.h"
35#include "libavutil/common.h"
36#include "libavutil/file.h"
37#include "libavutil/opt.h"
38#include "avfilter.h"
39#include "formats.h"
40#include "internal.h"
41#include "video.h"
42
43static void fill_iplimage_from_frame(IplImage *img, const AVFrame *frame, enum AVPixelFormat pixfmt)
44{
45 IplImage *tmpimg;
46 int depth, channels_nb;
47
48 if (pixfmt == AV_PIX_FMT_GRAY8) { depth = IPL_DEPTH_8U; channels_nb = 1; }
49 else if (pixfmt == AV_PIX_FMT_BGRA) { depth = IPL_DEPTH_8U; channels_nb = 4; }
50 else if (pixfmt == AV_PIX_FMT_BGR24) { depth = IPL_DEPTH_8U; channels_nb = 3; }
51 else return;
52
53 tmpimg = cvCreateImageHeader((CvSize){frame->width, frame->height}, depth, channels_nb);
54 *img = *tmpimg;
55 img->imageData = img->imageDataOrigin = frame->data[0];
56 img->dataOrder = IPL_DATA_ORDER_PIXEL;
57 img->origin = IPL_ORIGIN_TL;
58 img->widthStep = frame->linesize[0];
59}
60
61static void fill_frame_from_iplimage(AVFrame *frame, const IplImage *img, enum AVPixelFormat pixfmt)
62{
63 frame->linesize[0] = img->widthStep;
64 frame->data[0] = img->imageData;
65}
66
67static int query_formats(AVFilterContext *ctx)
68{
69 static const enum AVPixelFormat pix_fmts[] = {
70 AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
71 };
72 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
73 if (!fmts_list)
74 return AVERROR(ENOMEM);
75 return ff_set_common_formats(ctx, fmts_list);
76}
77
78typedef struct OCVContext {
79 const AVClass *class;
80 char *name;
81 char *params;
82 int (*init)(AVFilterContext *ctx, const char *args);
83 void (*uninit)(AVFilterContext *ctx);
84 void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
85 void *priv;
86} OCVContext;
87
88typedef struct SmoothContext {
89 int type;
90 int param1, param2;
91 double param3, param4;
92} SmoothContext;
93
94static av_cold int smooth_init(AVFilterContext *ctx, const char *args)
95{
96 OCVContext *s = ctx->priv;
97 SmoothContext *smooth = s->priv;
98 char type_str[128] = "gaussian";
99
100 smooth->param1 = 3;
101 smooth->param2 = 0;
102 smooth->param3 = 0.0;
103 smooth->param4 = 0.0;
104
105 if (args)
106 sscanf(args, "%127[^|]|%d|%d|%lf|%lf", type_str, &smooth->param1, &smooth->param2, &smooth->param3, &smooth->param4);
107
108 if (!strcmp(type_str, "blur" )) smooth->type = CV_BLUR;
109 else if (!strcmp(type_str, "blur_no_scale")) smooth->type = CV_BLUR_NO_SCALE;
110 else if (!strcmp(type_str, "median" )) smooth->type = CV_MEDIAN;
111 else if (!strcmp(type_str, "gaussian" )) smooth->type = CV_GAUSSIAN;
112 else if (!strcmp(type_str, "bilateral" )) smooth->type = CV_BILATERAL;
113 else {
114 av_log(ctx, AV_LOG_ERROR, "Smoothing type '%s' unknown.\n", type_str);
115 return AVERROR(EINVAL);
116 }
117
118 if (smooth->param1 < 0 || !(smooth->param1%2)) {
119 av_log(ctx, AV_LOG_ERROR,
120 "Invalid value '%d' for param1, it has to be a positive odd number\n",
121 smooth->param1);
122 return AVERROR(EINVAL);
123 }
124 if ((smooth->type == CV_BLUR || smooth->type == CV_BLUR_NO_SCALE || smooth->type == CV_GAUSSIAN) &&
125 (smooth->param2 < 0 || (smooth->param2 && !(smooth->param2%2)))) {
126 av_log(ctx, AV_LOG_ERROR,
127 "Invalid value '%d' for param2, it has to be zero or a positive odd number\n",
128 smooth->param2);
129 return AVERROR(EINVAL);
130 }
131
132 av_log(ctx, AV_LOG_VERBOSE, "type:%s param1:%d param2:%d param3:%f param4:%f\n",
133 type_str, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
134 return 0;
135}
136
137static void smooth_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
138{
139 OCVContext *s = ctx->priv;
140 SmoothContext *smooth = s->priv;
141 cvSmooth(inimg, outimg, smooth->type, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
142}
143
144static int read_shape_from_file(int *cols, int *rows, int **values, const char *filename,
145 void *log_ctx)
146{
147 uint8_t *buf, *p, *pend;
148 size_t size;
149 int ret, i, j, w;
150
151 if ((ret = av_file_map(filename, &buf, &size, 0, log_ctx)) < 0)
152 return ret;
153
154 /* prescan file to get the number of lines and the maximum width */
155 w = 0;
156 for (i = 0; i < size; i++) {
157 if (buf[i] == '\n') {
158 if (*rows == INT_MAX) {
159 av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of rows in the file\n");
160 ret = AVERROR_INVALIDDATA;
161 goto end;
162 }
163 ++(*rows);
164 *cols = FFMAX(*cols, w);
165 w = 0;
166 } else if (w == INT_MAX) {
167 av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of columns in the file\n");
168 return AVERROR_INVALIDDATA;
169 }
170 w++;
171 }
172 if (*rows > (SIZE_MAX / sizeof(int) / *cols)) {
173 av_log(log_ctx, AV_LOG_ERROR, "File with size %dx%d is too big\n",
174 *rows, *cols);
175 ret = AVERROR_INVALIDDATA;
176 goto end;
177 }
178 if (!(*values = av_mallocz_array(sizeof(int) * *rows, *cols))) {
179 ret = AVERROR(ENOMEM);
180 goto end;
181 }
182
183 /* fill *values */
184 p = buf;
185 pend = buf + size-1;
186 for (i = 0; i < *rows; i++) {
187 for (j = 0;; j++) {
188 if (p > pend || *p == '\n') {
189 p++;
190 break;
191 } else
192 (*values)[*cols*i + j] = !!av_isgraph(*(p++));
193 }
194 }
195
196end:
197 av_file_unmap(buf, size);
198
199#ifdef DEBUG
200 {
201 char *line;
202 if (!(line = av_malloc(*cols + 1)))
203 return AVERROR(ENOMEM);
204 for (i = 0; i < *rows; i++) {
205 for (j = 0; j < *cols; j++)
206 line[j] = (*values)[i * *cols + j] ? '@' : ' ';
207 line[j] = 0;
208 av_log(log_ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
209 }
210 av_free(line);
211 }
212#endif
213
214 return 0;
215}
216
217static int parse_iplconvkernel(IplConvKernel **kernel, char *buf, void *log_ctx)
218{
219 char shape_filename[128] = "", shape_str[32] = "rect";
220 int cols = 0, rows = 0, anchor_x = 0, anchor_y = 0, shape = CV_SHAPE_RECT;
221 int *values = NULL, ret = 0;
222
223 sscanf(buf, "%dx%d+%dx%d/%32[^=]=%127s", &cols, &rows, &anchor_x, &anchor_y, shape_str, shape_filename);
224
225 if (!strcmp(shape_str, "rect" )) shape = CV_SHAPE_RECT;
226 else if (!strcmp(shape_str, "cross" )) shape = CV_SHAPE_CROSS;
227 else if (!strcmp(shape_str, "ellipse")) shape = CV_SHAPE_ELLIPSE;
228 else if (!strcmp(shape_str, "custom" )) {
229 shape = CV_SHAPE_CUSTOM;
230 if ((ret = read_shape_from_file(&cols, &rows, &values, shape_filename, log_ctx)) < 0)
231 return ret;
232 } else {
233 av_log(log_ctx, AV_LOG_ERROR,
234 "Shape unspecified or type '%s' unknown.\n", shape_str);
235 ret = AVERROR(EINVAL);
236 goto out;
237 }
238
239 if (rows <= 0 || cols <= 0) {
240 av_log(log_ctx, AV_LOG_ERROR,
241 "Invalid non-positive values for shape size %dx%d\n", cols, rows);
242 ret = AVERROR(EINVAL);
243 goto out;
244 }
245
246 if (anchor_x < 0 || anchor_y < 0 || anchor_x >= cols || anchor_y >= rows) {
247 av_log(log_ctx, AV_LOG_ERROR,
248 "Shape anchor %dx%d is not inside the rectangle with size %dx%d.\n",
249 anchor_x, anchor_y, cols, rows);
250 ret = AVERROR(EINVAL);
251 goto out;
252 }
253
254 *kernel = cvCreateStructuringElementEx(cols, rows, anchor_x, anchor_y, shape, values);
255 if (!*kernel) {
256 ret = AVERROR(ENOMEM);
257 goto out;
258 }
259
260 av_log(log_ctx, AV_LOG_VERBOSE, "Structuring element: w:%d h:%d x:%d y:%d shape:%s\n",
261 rows, cols, anchor_x, anchor_y, shape_str);
262out:
263 av_freep(&values);
264 return ret;
265}
266
267typedef struct DilateContext {
268 int nb_iterations;
269 IplConvKernel *kernel;
270} DilateContext;
271
272static av_cold int dilate_init(AVFilterContext *ctx, const char *args)
273{
274 OCVContext *s = ctx->priv;
275 DilateContext *dilate = s->priv;
276 char default_kernel_str[] = "3x3+0x0/rect";
277 char *kernel_str = NULL;
278 const char *buf = args;
279 int ret;
280
281 if (args) {
282 kernel_str = av_get_token(&buf, "|");
283
284 if (!kernel_str)
285 return AVERROR(ENOMEM);
286 }
287
288 ret = parse_iplconvkernel(&dilate->kernel,
289 (!kernel_str || !*kernel_str) ? default_kernel_str
290 : kernel_str,
291 ctx);
292 av_free(kernel_str);
293 if (ret < 0)
294 return ret;
295
296 if (!buf || sscanf(buf, "|%d", &dilate->nb_iterations) != 1)
297 dilate->nb_iterations = 1;
298 av_log(ctx, AV_LOG_VERBOSE, "iterations_nb:%d\n", dilate->nb_iterations);
299 if (dilate->nb_iterations <= 0) {
300 av_log(ctx, AV_LOG_ERROR, "Invalid non-positive value '%d' for nb_iterations\n",
301 dilate->nb_iterations);
302 return AVERROR(EINVAL);
303 }
304 return 0;
305}
306
307static av_cold void dilate_uninit(AVFilterContext *ctx)
308{
309 OCVContext *s = ctx->priv;
310 DilateContext *dilate = s->priv;
311
312 cvReleaseStructuringElement(&dilate->kernel);
313}
314
315static void dilate_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
316{
317 OCVContext *s = ctx->priv;
318 DilateContext *dilate = s->priv;
319 cvDilate(inimg, outimg, dilate->kernel, dilate->nb_iterations);
320}
321
322static void erode_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
323{
324 OCVContext *s = ctx->priv;
325 DilateContext *dilate = s->priv;
326 cvErode(inimg, outimg, dilate->kernel, dilate->nb_iterations);
327}
328
329typedef struct OCVFilterEntry {
330 const char *name;
331 size_t priv_size;
332 int (*init)(AVFilterContext *ctx, const char *args);
333 void (*uninit)(AVFilterContext *ctx);
334 void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
335} OCVFilterEntry;
336
337static const OCVFilterEntry ocv_filter_entries[] = {
338 { "dilate", sizeof(DilateContext), dilate_init, dilate_uninit, dilate_end_frame_filter },
339 { "erode", sizeof(DilateContext), dilate_init, dilate_uninit, erode_end_frame_filter },
340 { "smooth", sizeof(SmoothContext), smooth_init, NULL, smooth_end_frame_filter },
341};
342
343static av_cold int init(AVFilterContext *ctx)
344{
345 OCVContext *s = ctx->priv;
346 int i;
347
348 if (!s->name) {
349 av_log(ctx, AV_LOG_ERROR, "No libopencv filter name specified\n");
350 return AVERROR(EINVAL);
351 }
352 for (i = 0; i < FF_ARRAY_ELEMS(ocv_filter_entries); i++) {
353 const OCVFilterEntry *entry = &ocv_filter_entries[i];
354 if (!strcmp(s->name, entry->name)) {
355 s->init = entry->init;
356 s->uninit = entry->uninit;
357 s->end_frame_filter = entry->end_frame_filter;
358
359 if (!(s->priv = av_mallocz(entry->priv_size)))
360 return AVERROR(ENOMEM);
361 return s->init(ctx, s->params);
362 }
363 }
364
365 av_log(ctx, AV_LOG_ERROR, "No libopencv filter named '%s'\n", s->name);
366 return AVERROR(EINVAL);
367}
368
369static av_cold void uninit(AVFilterContext *ctx)
370{
371 OCVContext *s = ctx->priv;
372
373 if (s->uninit)
374 s->uninit(ctx);
375 av_freep(&s->priv);
376}
377
378static int filter_frame(AVFilterLink *inlink, AVFrame *in)
379{
380 AVFilterContext *ctx = inlink->dst;
381 OCVContext *s = ctx->priv;
382 AVFilterLink *outlink= inlink->dst->outputs[0];
383 AVFrame *out;
384 IplImage inimg, outimg;
385
386 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
387 if (!out) {
388 av_frame_free(&in);
389 return AVERROR(ENOMEM);
390 }
391 av_frame_copy_props(out, in);
392
393 fill_iplimage_from_frame(&inimg , in , inlink->format);
394 fill_iplimage_from_frame(&outimg, out, inlink->format);
395 s->end_frame_filter(ctx, &inimg, &outimg);
396 fill_frame_from_iplimage(out, &outimg, inlink->format);
397
398 av_frame_free(&in);
399
400 return ff_filter_frame(outlink, out);
401}
402
403#define OFFSET(x) offsetof(OCVContext, x)
404#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
405static const AVOption ocv_options[] = {
406 { "filter_name", NULL, OFFSET(name), AV_OPT_TYPE_STRING, .flags = FLAGS },
407 { "filter_params", NULL, OFFSET(params), AV_OPT_TYPE_STRING, .flags = FLAGS },
408 { NULL }
409};
410
411AVFILTER_DEFINE_CLASS(ocv);
412
413static const AVFilterPad avfilter_vf_ocv_inputs[] = {
414 {
415 .name = "default",
416 .type = AVMEDIA_TYPE_VIDEO,
417 .filter_frame = filter_frame,
418 },
419 { NULL }
420};
421
422static const AVFilterPad avfilter_vf_ocv_outputs[] = {
423 {
424 .name = "default",
425 .type = AVMEDIA_TYPE_VIDEO,
426 },
427 { NULL }
428};
429
430AVFilter ff_vf_ocv = {
431 .name = "ocv",
432 .description = NULL_IF_CONFIG_SMALL("Apply transform using libopencv."),
433 .priv_size = sizeof(OCVContext),
434 .priv_class = &ocv_class,
435 .query_formats = query_formats,
436 .init = init,
437 .uninit = uninit,
438 .inputs = avfilter_vf_ocv_inputs,
439 .outputs = avfilter_vf_ocv_outputs,
440};
441
generated by cgit at 2024-05-17 03:14:26 (GMT)