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libavfilter/vf_libopencv.c

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00001 /*
00002  * Copyright (c) 2010 Stefano Sabatini
00003  *
00004  * This file is part of Libav.
00005  *
00006  * Libav is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * Libav is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with Libav; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00026 /* #define DEBUG */
00027 
00028 #include <opencv/cv.h>
00029 #include <opencv/cxcore.h>
00030 #include "libavutil/avstring.h"
00031 #include "libavutil/file.h"
00032 #include "avfilter.h"
00033 
00034 static void fill_iplimage_from_picref(IplImage *img, const AVFilterBufferRef *picref, enum PixelFormat pixfmt)
00035 {
00036     IplImage *tmpimg;
00037     int depth, channels_nb;
00038 
00039     if      (pixfmt == PIX_FMT_GRAY8) { depth = IPL_DEPTH_8U;  channels_nb = 1; }
00040     else if (pixfmt == PIX_FMT_BGRA)  { depth = IPL_DEPTH_8U;  channels_nb = 4; }
00041     else if (pixfmt == PIX_FMT_BGR24) { depth = IPL_DEPTH_8U;  channels_nb = 3; }
00042     else return;
00043 
00044     tmpimg = cvCreateImageHeader((CvSize){picref->video->w, picref->video->h}, depth, channels_nb);
00045     *img = *tmpimg;
00046     img->imageData = img->imageDataOrigin = picref->data[0];
00047     img->dataOrder = IPL_DATA_ORDER_PIXEL;
00048     img->origin    = IPL_ORIGIN_TL;
00049     img->widthStep = picref->linesize[0];
00050 }
00051 
00052 static void fill_picref_from_iplimage(AVFilterBufferRef *picref, const IplImage *img, enum PixelFormat pixfmt)
00053 {
00054     picref->linesize[0] = img->widthStep;
00055     picref->data[0]     = img->imageData;
00056 }
00057 
00058 static int query_formats(AVFilterContext *ctx)
00059 {
00060     static const enum PixelFormat pix_fmts[] = {
00061         PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_GRAY8, PIX_FMT_NONE
00062     };
00063 
00064     avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
00065     return 0;
00066 }
00067 
00068 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
00069 
00070 typedef struct {
00071     const char *name;
00072     int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
00073     void (*uninit)(AVFilterContext *ctx);
00074     void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
00075     void *priv;
00076 } OCVContext;
00077 
00078 typedef struct {
00079     int type;
00080     int    param1, param2;
00081     double param3, param4;
00082 } SmoothContext;
00083 
00084 static av_cold int smooth_init(AVFilterContext *ctx, const char *args, void *opaque)
00085 {
00086     OCVContext *ocv = ctx->priv;
00087     SmoothContext *smooth = ocv->priv;
00088     char type_str[128] = "gaussian";
00089 
00090     smooth->param1 = 3;
00091     smooth->param2 = 0;
00092     smooth->param3 = 0.0;
00093     smooth->param4 = 0.0;
00094 
00095     if (args)
00096         sscanf(args, "%127[^:]:%d:%d:%lf:%lf", type_str, &smooth->param1, &smooth->param2, &smooth->param3, &smooth->param4);
00097 
00098     if      (!strcmp(type_str, "blur"         )) smooth->type = CV_BLUR;
00099     else if (!strcmp(type_str, "blur_no_scale")) smooth->type = CV_BLUR_NO_SCALE;
00100     else if (!strcmp(type_str, "median"       )) smooth->type = CV_MEDIAN;
00101     else if (!strcmp(type_str, "gaussian"     )) smooth->type = CV_GAUSSIAN;
00102     else if (!strcmp(type_str, "bilateral"    )) smooth->type = CV_BILATERAL;
00103     else {
00104         av_log(ctx, AV_LOG_ERROR, "Smoothing type '%s' unknown\n.", type_str);
00105         return AVERROR(EINVAL);
00106     }
00107 
00108     if (smooth->param1 < 0 || !(smooth->param1%2)) {
00109         av_log(ctx, AV_LOG_ERROR,
00110                "Invalid value '%d' for param1, it has to be a positive odd number\n",
00111                smooth->param1);
00112         return AVERROR(EINVAL);
00113     }
00114     if ((smooth->type == CV_BLUR || smooth->type == CV_BLUR_NO_SCALE || smooth->type == CV_GAUSSIAN) &&
00115         (smooth->param2 < 0 || (smooth->param2 && !(smooth->param2%2)))) {
00116         av_log(ctx, AV_LOG_ERROR,
00117                "Invalid value '%d' for param2, it has to be zero or a positive odd number\n",
00118                smooth->param2);
00119         return AVERROR(EINVAL);
00120     }
00121 
00122     av_log(ctx, AV_LOG_INFO, "type:%s param1:%d param2:%d param3:%f param4:%f\n",
00123            type_str, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
00124     return 0;
00125 }
00126 
00127 static void smooth_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
00128 {
00129     OCVContext *ocv = ctx->priv;
00130     SmoothContext *smooth = ocv->priv;
00131     cvSmooth(inimg, outimg, smooth->type, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
00132 }
00133 
00134 static int read_shape_from_file(int *cols, int *rows, int **values, const char *filename,
00135                                 void *log_ctx)
00136 {
00137     uint8_t *buf, *p, *pend;
00138     size_t size;
00139     int ret, i, j, w;
00140 
00141     if ((ret = av_file_map(filename, &buf, &size, 0, log_ctx)) < 0)
00142         return ret;
00143 
00144     /* prescan file to get the number of lines and the maximum width */
00145     w = 0;
00146     for (i = 0; i < size; i++) {
00147         if (buf[i] == '\n') {
00148             if (*rows == INT_MAX) {
00149                 av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of rows in the file\n");
00150                 return AVERROR_INVALIDDATA;
00151             }
00152             ++(*rows);
00153             *cols = FFMAX(*cols, w);
00154             w = 0;
00155         } else if (w == INT_MAX) {
00156             av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of columns in the file\n");
00157             return AVERROR_INVALIDDATA;
00158         }
00159         w++;
00160     }
00161     if (*rows > (SIZE_MAX / sizeof(int) / *cols)) {
00162         av_log(log_ctx, AV_LOG_ERROR, "File with size %dx%d is too big\n",
00163                *rows, *cols);
00164         return AVERROR_INVALIDDATA;
00165     }
00166     if (!(*values = av_mallocz(sizeof(int) * *rows * *cols)))
00167         return AVERROR(ENOMEM);
00168 
00169     /* fill *values */
00170     p    = buf;
00171     pend = buf + size-1;
00172     for (i = 0; i < *rows; i++) {
00173         for (j = 0;; j++) {
00174             if (p > pend || *p == '\n') {
00175                 p++;
00176                 break;
00177             } else
00178                 (*values)[*cols*i + j] = !!isgraph(*(p++));
00179         }
00180     }
00181     av_file_unmap(buf, size);
00182 
00183 #ifdef DEBUG
00184     {
00185         char *line;
00186         if (!(line = av_malloc(*cols + 1)))
00187             return AVERROR(ENOMEM);
00188         for (i = 0; i < *rows; i++) {
00189             for (j = 0; j < *cols; j++)
00190                 line[j] = (*values)[i * *cols + j] ? '@' : ' ';
00191             line[j] = 0;
00192             av_log(log_ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
00193         }
00194         av_free(line);
00195     }
00196 #endif
00197 
00198     return 0;
00199 }
00200 
00201 static int parse_iplconvkernel(IplConvKernel **kernel, char *buf, void *log_ctx)
00202 {
00203     char shape_filename[128] = "", shape_str[32] = "rect";
00204     int cols = 0, rows = 0, anchor_x = 0, anchor_y = 0, shape = CV_SHAPE_RECT;
00205     int *values = NULL, ret;
00206 
00207     sscanf(buf, "%dx%d+%dx%d/%32[^=]=%127s", &cols, &rows, &anchor_x, &anchor_y, shape_str, shape_filename);
00208 
00209     if      (!strcmp(shape_str, "rect"   )) shape = CV_SHAPE_RECT;
00210     else if (!strcmp(shape_str, "cross"  )) shape = CV_SHAPE_CROSS;
00211     else if (!strcmp(shape_str, "ellipse")) shape = CV_SHAPE_ELLIPSE;
00212     else if (!strcmp(shape_str, "custom" )) {
00213         shape = CV_SHAPE_CUSTOM;
00214         if ((ret = read_shape_from_file(&cols, &rows, &values, shape_filename, log_ctx)) < 0)
00215             return ret;
00216     } else {
00217         av_log(log_ctx, AV_LOG_ERROR,
00218                "Shape unspecified or type '%s' unknown\n.", shape_str);
00219         return AVERROR(EINVAL);
00220     }
00221 
00222     if (rows <= 0 || cols <= 0) {
00223         av_log(log_ctx, AV_LOG_ERROR,
00224                "Invalid non-positive values for shape size %dx%d\n", cols, rows);
00225         return AVERROR(EINVAL);
00226     }
00227 
00228     if (anchor_x < 0 || anchor_y < 0 || anchor_x >= cols || anchor_y >= rows) {
00229         av_log(log_ctx, AV_LOG_ERROR,
00230                "Shape anchor %dx%d is not inside the rectangle with size %dx%d.\n",
00231                anchor_x, anchor_y, cols, rows);
00232         return AVERROR(EINVAL);
00233     }
00234 
00235     *kernel = cvCreateStructuringElementEx(cols, rows, anchor_x, anchor_y, shape, values);
00236     av_freep(&values);
00237     if (!*kernel)
00238         return AVERROR(ENOMEM);
00239 
00240     av_log(log_ctx, AV_LOG_INFO, "Structuring element: w:%d h:%d x:%d y:%d shape:%s\n",
00241            rows, cols, anchor_x, anchor_y, shape_str);
00242     return 0;
00243 }
00244 
00245 typedef struct {
00246     int nb_iterations;
00247     IplConvKernel *kernel;
00248 } DilateContext;
00249 
00250 static av_cold int dilate_init(AVFilterContext *ctx, const char *args, void *opaque)
00251 {
00252     OCVContext *ocv = ctx->priv;
00253     DilateContext *dilate = ocv->priv;
00254     char default_kernel_str[] = "3x3+0x0/rect";
00255     char *kernel_str;
00256     const char *buf = args;
00257     int ret;
00258 
00259     dilate->nb_iterations = 1;
00260 
00261     if (args)
00262         kernel_str = av_get_token(&buf, ":");
00263     if ((ret = parse_iplconvkernel(&dilate->kernel,
00264                                    *kernel_str ? kernel_str : default_kernel_str,
00265                                    ctx)) < 0)
00266         return ret;
00267     av_free(kernel_str);
00268 
00269     sscanf(buf, ":%d", &dilate->nb_iterations);
00270     av_log(ctx, AV_LOG_INFO, "iterations_nb:%d\n", dilate->nb_iterations);
00271     if (dilate->nb_iterations <= 0) {
00272         av_log(ctx, AV_LOG_ERROR, "Invalid non-positive value '%d' for nb_iterations\n",
00273                dilate->nb_iterations);
00274         return AVERROR(EINVAL);
00275     }
00276     return 0;
00277 }
00278 
00279 static av_cold void dilate_uninit(AVFilterContext *ctx)
00280 {
00281     OCVContext *ocv = ctx->priv;
00282     DilateContext *dilate = ocv->priv;
00283 
00284     cvReleaseStructuringElement(&dilate->kernel);
00285 }
00286 
00287 static void dilate_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
00288 {
00289     OCVContext *ocv = ctx->priv;
00290     DilateContext *dilate = ocv->priv;
00291     cvDilate(inimg, outimg, dilate->kernel, dilate->nb_iterations);
00292 }
00293 
00294 static void erode_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
00295 {
00296     OCVContext *ocv = ctx->priv;
00297     DilateContext *dilate = ocv->priv;
00298     cvErode(inimg, outimg, dilate->kernel, dilate->nb_iterations);
00299 }
00300 
00301 typedef struct {
00302     const char *name;
00303     size_t priv_size;
00304     int  (*init)(AVFilterContext *ctx, const char *args, void *opaque);
00305     void (*uninit)(AVFilterContext *ctx);
00306     void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
00307 } OCVFilterEntry;
00308 
00309 static OCVFilterEntry ocv_filter_entries[] = {
00310     { "dilate", sizeof(DilateContext), dilate_init, dilate_uninit, dilate_end_frame_filter },
00311     { "erode",  sizeof(DilateContext), dilate_init, dilate_uninit, erode_end_frame_filter  },
00312     { "smooth", sizeof(SmoothContext), smooth_init, NULL, smooth_end_frame_filter },
00313 };
00314 
00315 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00316 {
00317     OCVContext *ocv = ctx->priv;
00318     char name[128], priv_args[1024];
00319     int i;
00320     char c;
00321 
00322     sscanf(args, "%127[^=:]%c%1023s", name, &c, priv_args);
00323 
00324     for (i = 0; i < FF_ARRAY_ELEMS(ocv_filter_entries); i++) {
00325         OCVFilterEntry *entry = &ocv_filter_entries[i];
00326         if (!strcmp(name, entry->name)) {
00327             ocv->name             = entry->name;
00328             ocv->init             = entry->init;
00329             ocv->uninit           = entry->uninit;
00330             ocv->end_frame_filter = entry->end_frame_filter;
00331 
00332             if (!(ocv->priv = av_mallocz(entry->priv_size)))
00333                 return AVERROR(ENOMEM);
00334             return ocv->init(ctx, priv_args, opaque);
00335         }
00336     }
00337 
00338     av_log(ctx, AV_LOG_ERROR, "No libopencv filter named '%s'\n", name);
00339     return AVERROR(EINVAL);
00340 }
00341 
00342 static av_cold void uninit(AVFilterContext *ctx)
00343 {
00344     OCVContext *ocv = ctx->priv;
00345 
00346     if (ocv->uninit)
00347         ocv->uninit(ctx);
00348     av_free(ocv->priv);
00349     memset(ocv, 0, sizeof(*ocv));
00350 }
00351 
00352 static void end_frame(AVFilterLink *inlink)
00353 {
00354     AVFilterContext *ctx = inlink->dst;
00355     OCVContext *ocv = ctx->priv;
00356     AVFilterLink *outlink= inlink->dst->outputs[0];
00357     AVFilterBufferRef *inpicref  = inlink ->cur_buf;
00358     AVFilterBufferRef *outpicref = outlink->out_buf;
00359     IplImage inimg, outimg;
00360 
00361     fill_iplimage_from_picref(&inimg , inpicref , inlink->format);
00362     fill_iplimage_from_picref(&outimg, outpicref, inlink->format);
00363     ocv->end_frame_filter(ctx, &inimg, &outimg);
00364     fill_picref_from_iplimage(outpicref, &outimg, inlink->format);
00365 
00366     avfilter_unref_buffer(inpicref);
00367     avfilter_draw_slice(outlink, 0, outlink->h, 1);
00368     avfilter_end_frame(outlink);
00369     avfilter_unref_buffer(outpicref);
00370 }
00371 
00372 AVFilter avfilter_vf_ocv = {
00373     .name        = "ocv",
00374     .description = NULL_IF_CONFIG_SMALL("Apply transform using libopencv."),
00375 
00376     .priv_size = sizeof(OCVContext),
00377 
00378     .query_formats = query_formats,
00379     .init = init,
00380     .uninit = uninit,
00381 
00382     .inputs    = (AVFilterPad[]) {{ .name             = "default",
00383                                     .type             = AVMEDIA_TYPE_VIDEO,
00384                                     .draw_slice       = null_draw_slice,
00385                                     .end_frame        = end_frame,
00386                                     .min_perms        = AV_PERM_READ },
00387                                   { .name = NULL}},
00388 
00389     .outputs   = (AVFilterPad[]) {{ .name             = "default",
00390                                     .type             = AVMEDIA_TYPE_VIDEO, },
00391                                   { .name = NULL}},
00392 };
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