FFmpeg: libavfilter/vf_libopencv.c Source File

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libavfilter

vf_libopencv.c

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1 /*

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 */

21 /**

22 * @file

23 * libopencv wrapper functions

24 */

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"

37 static void fill_iplimage_from_frame(IplImage *img, const AVFrame *frame, enum AVPixelFormat pixfmt)

38 {

39 IplImage *tmpimg;

40 int depth, channels_nb;

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;

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 }

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 }

61 static int query_formats(AVFilterContext *ctx)

62 {

63 static const enum AVPixelFormat pix_fmts[] = {

64 AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE

65 };

67 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

68 return 0;

69 }

71 typedef struct {

72 const AVClass *class;

73 char *name;

74 char *params;

75 int (*init)(AVFilterContext *ctx, const char *args);

76 void (*uninit)(AVFilterContext *ctx);

77 void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);

78 void *priv;

79 } OCVContext;

81 typedef struct {

82 int type;

83 int param1, param2;

84 double param3, param4;

85 } SmoothContext;

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";

93 smooth->param1 = 3;

94 smooth->param2 = 0;

95 smooth->param3 = 0.0;

96 smooth->param4 = 0.0;

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(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 {

249 int nb_iterations;

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

283 static av_cold void dilate_uninit(AVFilterContext *ctx)

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 {

306 const char *name;

307 size_t priv_size;

308 int (*init)(AVFilterContext *ctx, const char *args);

309 void (*uninit)(AVFilterContext *ctx);

310 void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);

311 } OCVFilterEntry;

312

313 static OCVFilterEntry ocv_filter_entries[] = {

314 { "dilate", sizeof(DilateContext), dilate_init, dilate_uninit, dilate_end_frame_filter },

315 { "erode", sizeof(DilateContext), dilate_init, dilate_uninit, erode_end_frame_filter },

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;

333 s->end_frame_filter = entry->end_frame_filter;

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_free(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

387 AVFILTER_DEFINE_CLASS(ocv);

388

389 static const AVFilterPad avfilter_vf_ocv_inputs[] = {

390 {

391 .name = "default",

392 .type = AVMEDIA_TYPE_VIDEO,

393 .filter_frame = filter_frame,

394 },

395 { NULL }

396 };

397

398 static const AVFilterPad avfilter_vf_ocv_outputs[] = {

399 {

400 .name = "default",

401 .type = AVMEDIA_TYPE_VIDEO,

402 },

403 { NULL }

404 };

405

406 AVFilter avfilter_vf_ocv = {

407 .name = "ocv",

408 .description = NULL_IF_CONFIG_SMALL("Apply transform using libopencv."),

409 .priv_size = sizeof(OCVContext),

410 .priv_class = &ocv_class,

411 .query_formats = query_formats,

412 .init = init,

413 .uninit = uninit,

414 .inputs = avfilter_vf_ocv_inputs,

415 .outputs = avfilter_vf_ocv_outputs,

416 };

Generated on Sat Jan 25 2014 19:52:01 for FFmpeg by doxygen 1.8.2