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/*
* Copyright (c) 2010 Stefano Sabatini
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* libopencv wrapper functions
*/
/* #define DEBUG */
#include <opencv/cv.h>
#include <opencv/cxcore.h>
#include "libavutil/avstring.h"
#include "libavutil/file.h"
#include "avfilter.h"
static void fill_iplimage_from_picref(IplImage *img, const AVFilterBufferRef *picref, enum PixelFormat pixfmt)
{
IplImage *tmpimg;
int depth, channels_nb;
if (pixfmt == PIX_FMT_GRAY8) { depth = IPL_DEPTH_8U; channels_nb = 1; }
else if (pixfmt == PIX_FMT_BGRA) { depth = IPL_DEPTH_8U; channels_nb = 4; }
else if (pixfmt == PIX_FMT_BGR24) { depth = IPL_DEPTH_8U; channels_nb = 3; }
else return;
tmpimg = cvCreateImageHeader((CvSize){picref->video->w, picref->video->h}, depth, channels_nb);
*img = *tmpimg;
img->imageData = img->imageDataOrigin = picref->data[0];
img->dataOrder = IPL_DATA_ORDER_PIXEL;
img->origin = IPL_ORIGIN_TL;
img->widthStep = picref->linesize[0];
}
static void fill_picref_from_iplimage(AVFilterBufferRef *picref, const IplImage *img, enum PixelFormat pixfmt)
{
picref->linesize[0] = img->widthStep;
picref->data[0] = img->imageData;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum PixelFormat pix_fmts[] = {
PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_GRAY8, PIX_FMT_NONE
};
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
typedef struct {
const char *name;
int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
void (*uninit)(AVFilterContext *ctx);
void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
void *priv;
} OCVContext;
typedef struct {
int type;
int param1, param2;
double param3, param4;
} SmoothContext;
static av_cold int smooth_init(AVFilterContext *ctx, const char *args, void *opaque)
{
OCVContext *ocv = ctx->priv;
SmoothContext *smooth = ocv->priv;
char type_str[128] = "gaussian";
smooth->param1 = 3;
smooth->param2 = 0;
smooth->param3 = 0.0;
smooth->param4 = 0.0;
if (args)
sscanf(args, "%127[^:]:%d:%d:%lf:%lf", type_str, &smooth->param1, &smooth->param2, &smooth->param3, &smooth->param4);
if (!strcmp(type_str, "blur" )) smooth->type = CV_BLUR;
else if (!strcmp(type_str, "blur_no_scale")) smooth->type = CV_BLUR_NO_SCALE;
else if (!strcmp(type_str, "median" )) smooth->type = CV_MEDIAN;
else if (!strcmp(type_str, "gaussian" )) smooth->type = CV_GAUSSIAN;
else if (!strcmp(type_str, "bilateral" )) smooth->type = CV_BILATERAL;
else {
av_log(ctx, AV_LOG_ERROR, "Smoothing type '%s' unknown\n.", type_str);
return AVERROR(EINVAL);
}
if (smooth->param1 < 0 || !(smooth->param1%2)) {
av_log(ctx, AV_LOG_ERROR,
"Invalid value '%d' for param1, it has to be a positive odd number\n",
smooth->param1);
return AVERROR(EINVAL);
}
if ((smooth->type == CV_BLUR || smooth->type == CV_BLUR_NO_SCALE || smooth->type == CV_GAUSSIAN) &&
(smooth->param2 < 0 || (smooth->param2 && !(smooth->param2%2)))) {
av_log(ctx, AV_LOG_ERROR,
"Invalid value '%d' for param2, it has to be zero or a positive odd number\n",
smooth->param2);
return AVERROR(EINVAL);
}
av_log(ctx, AV_LOG_INFO, "type:%s param1:%d param2:%d param3:%f param4:%f\n",
type_str, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
return 0;
}
static void smooth_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
{
OCVContext *ocv = ctx->priv;
SmoothContext *smooth = ocv->priv;
cvSmooth(inimg, outimg, smooth->type, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
}
static int read_shape_from_file(int *cols, int *rows, int **values, const char *filename,
void *log_ctx)
{
uint8_t *buf, *p, *pend;
size_t size;
int ret, i, j, w;
if ((ret = av_file_map(filename, &buf, &size, 0, log_ctx)) < 0)
return ret;
/* prescan file to get the number of lines and the maximum width */
w = 0;
for (i = 0; i < size; i++) {
if (buf[i] == '\n') {
if (*rows == INT_MAX) {
av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of rows in the file\n");
return AVERROR_INVALIDDATA;
}
++(*rows);
*cols = FFMAX(*cols, w);
w = 0;
} else if (w == INT_MAX) {
av_log(log_ctx, AV_LOG_ERROR, "Overflow on the number of columns in the file\n");
return AVERROR_INVALIDDATA;
}
w++;
}
if (*rows > (SIZE_MAX / sizeof(int) / *cols)) {
av_log(log_ctx, AV_LOG_ERROR, "File with size %dx%d is too big\n",
*rows, *cols);
return AVERROR_INVALIDDATA;
}
if (!(*values = av_mallocz(sizeof(int) * *rows * *cols)))
return AVERROR(ENOMEM);
/* fill *values */
p = buf;
pend = buf + size-1;
for (i = 0; i < *rows; i++) {
for (j = 0;; j++) {
if (p > pend || *p == '\n') {
p++;
break;
} else
(*values)[*cols*i + j] = !!isgraph(*(p++));
}
}
av_file_unmap(buf, size);
#ifdef DEBUG
{
char *line;
if (!(line = av_malloc(*cols + 1)))
return AVERROR(ENOMEM);
for (i = 0; i < *rows; i++) {
for (j = 0; j < *cols; j++)
line[j] = (*values)[i * *cols + j] ? '@' : ' ';
line[j] = 0;
av_log(log_ctx, AV_LOG_DEBUG, "%3d: %s\n", i, line);
}
av_free(line);
}
#endif
return 0;
}
static int parse_iplconvkernel(IplConvKernel **kernel, char *buf, void *log_ctx)
{
char shape_filename[128] = "", shape_str[32] = "rect";
int cols = 0, rows = 0, anchor_x = 0, anchor_y = 0, shape = CV_SHAPE_RECT;
int *values = NULL, ret;
sscanf(buf, "%dx%d+%dx%d/%32[^=]=%127s", &cols, &rows, &anchor_x, &anchor_y, shape_str, shape_filename);
if (!strcmp(shape_str, "rect" )) shape = CV_SHAPE_RECT;
else if (!strcmp(shape_str, "cross" )) shape = CV_SHAPE_CROSS;
else if (!strcmp(shape_str, "ellipse")) shape = CV_SHAPE_ELLIPSE;
else if (!strcmp(shape_str, "custom" )) {
shape = CV_SHAPE_CUSTOM;
if ((ret = read_shape_from_file(&cols, &rows, &values, shape_filename, log_ctx)) < 0)
return ret;
} else {
av_log(log_ctx, AV_LOG_ERROR,
"Shape unspecified or type '%s' unknown\n.", shape_str);
return AVERROR(EINVAL);
}
if (rows <= 0 || cols <= 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Invalid non-positive values for shape size %dx%d\n", cols, rows);
return AVERROR(EINVAL);
}
if (anchor_x < 0 || anchor_y < 0 || anchor_x >= cols || anchor_y >= rows) {
av_log(log_ctx, AV_LOG_ERROR,
"Shape anchor %dx%d is not inside the rectangle with size %dx%d.\n",
anchor_x, anchor_y, cols, rows);
return AVERROR(EINVAL);
}
*kernel = cvCreateStructuringElementEx(cols, rows, anchor_x, anchor_y, shape, values);
av_freep(&values);
if (!*kernel)
return AVERROR(ENOMEM);
av_log(log_ctx, AV_LOG_INFO, "Structuring element: w:%d h:%d x:%d y:%d shape:%s\n",
rows, cols, anchor_x, anchor_y, shape_str);
return 0;
}
typedef struct {
int nb_iterations;
IplConvKernel *kernel;
} DilateContext;
static av_cold int dilate_init(AVFilterContext *ctx, const char *args, void *opaque)
{
OCVContext *ocv = ctx->priv;
DilateContext *dilate = ocv->priv;
char default_kernel_str[] = "3x3+0x0/rect";
char *kernel_str;
const char *buf = args;
int ret;
dilate->nb_iterations = 1;
if (args)
kernel_str = av_get_token(&buf, ":");
if ((ret = parse_iplconvkernel(&dilate->kernel,
*kernel_str ? kernel_str : default_kernel_str,
ctx)) < 0)
return ret;
av_free(kernel_str);
sscanf(buf, ":%d", &dilate->nb_iterations);
av_log(ctx, AV_LOG_INFO, "iterations_nb:%d\n", dilate->nb_iterations);
if (dilate->nb_iterations <= 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid non-positive value '%d' for nb_iterations\n",
dilate->nb_iterations);
return AVERROR(EINVAL);
}
return 0;
}
static av_cold void dilate_uninit(AVFilterContext *ctx)
{
OCVContext *ocv = ctx->priv;
DilateContext *dilate = ocv->priv;
cvReleaseStructuringElement(&dilate->kernel);
}
static void dilate_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
{
OCVContext *ocv = ctx->priv;
DilateContext *dilate = ocv->priv;
cvDilate(inimg, outimg, dilate->kernel, dilate->nb_iterations);
}
static void erode_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
{
OCVContext *ocv = ctx->priv;
DilateContext *dilate = ocv->priv;
cvErode(inimg, outimg, dilate->kernel, dilate->nb_iterations);
}
typedef struct {
const char *name;
size_t priv_size;
int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
void (*uninit)(AVFilterContext *ctx);
void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
} OCVFilterEntry;
static OCVFilterEntry ocv_filter_entries[] = {
{ "dilate", sizeof(DilateContext), dilate_init, dilate_uninit, dilate_end_frame_filter },
{ "erode", sizeof(DilateContext), dilate_init, dilate_uninit, erode_end_frame_filter },
{ "smooth", sizeof(SmoothContext), smooth_init, NULL, smooth_end_frame_filter },
};
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
OCVContext *ocv = ctx->priv;
char name[128], priv_args[1024];
int i;
char c;
sscanf(args, "%127[^=:]%c%1023s", name, &c, priv_args);
for (i = 0; i < FF_ARRAY_ELEMS(ocv_filter_entries); i++) {
OCVFilterEntry *entry = &ocv_filter_entries[i];
if (!strcmp(name, entry->name)) {
ocv->name = entry->name;
ocv->init = entry->init;
ocv->uninit = entry->uninit;
ocv->end_frame_filter = entry->end_frame_filter;
if (!(ocv->priv = av_mallocz(entry->priv_size)))
return AVERROR(ENOMEM);
return ocv->init(ctx, priv_args, opaque);
}
}
av_log(ctx, AV_LOG_ERROR, "No libopencv filter named '%s'\n", name);
return AVERROR(EINVAL);
}
static av_cold void uninit(AVFilterContext *ctx)
{
OCVContext *ocv = ctx->priv;
if (ocv->uninit)
ocv->uninit(ctx);
av_free(ocv->priv);
memset(ocv, 0, sizeof(*ocv));
}
static void end_frame(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
OCVContext *ocv = ctx->priv;
AVFilterLink *outlink= inlink->dst->outputs[0];
AVFilterBufferRef *inpicref = inlink ->cur_buf;
AVFilterBufferRef *outpicref = outlink->out_buf;
IplImage inimg, outimg;
fill_iplimage_from_picref(&inimg , inpicref , inlink->format);
fill_iplimage_from_picref(&outimg, outpicref, inlink->format);
ocv->end_frame_filter(ctx, &inimg, &outimg);
fill_picref_from_iplimage(outpicref, &outimg, inlink->format);
avfilter_unref_buffer(inpicref);
avfilter_draw_slice(outlink, 0, outlink->h, 1);
avfilter_end_frame(outlink);
avfilter_unref_buffer(outpicref);
}
AVFilter avfilter_vf_ocv = {
.name = "ocv",
.description = NULL_IF_CONFIG_SMALL("Apply transform using libopencv."),
.priv_size = sizeof(OCVContext),
.query_formats = query_formats,
.init = init,
.uninit = uninit,
.inputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.draw_slice = null_draw_slice,
.end_frame = end_frame,
.min_perms = AV_PERM_READ },
{ .name = NULL}},
.outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO, },
{ .name = NULL}},
};
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