b8e3d3f791
Searching in directory names can yield confusing results; e.g. if the input is "jpeg2000/image1.jp2", it will infer the pattern "jpeg%04d/image1.jp2", which is likely not what the user intended. If the user really desires for the variable part to be in the directory name, it can always use an explicit pattern.
375 lines
8.9 KiB
C++
375 lines
8.9 KiB
C++
/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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//
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//
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// Intel License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2008, Nils Hasler, all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * The name of Intel Corporation may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// This software is provided by the copyright holders and contributors "as is" and
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// any express or implied warranties, including, but not limited to, the implied
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// indirect, incidental, special, exemplary, or consequential damages
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// (including, but not limited to, procurement of substitute goods or services;
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// loss of use, data, or profits; or business interruption) however caused
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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//
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//M*/
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// Author: Nils Hasler <hasler@mpi-inf.mpg.de>
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//
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// Max-Planck-Institut Informatik
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//
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// capture video from a sequence of images
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// the filename when opening can either be a printf pattern such as
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// video%04d.png or the first frame of the sequence i.e. video0001.png
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//
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#include "precomp.hpp"
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#include <sys/stat.h>
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#ifdef NDEBUG
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#define CV_WARN(message)
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#else
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#define CV_WARN(message) fprintf(stderr, "warning: %s (%s:%d)\n", message, __FILE__, __LINE__)
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#endif
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#ifndef _MAX_PATH
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#define _MAX_PATH 1024
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#endif
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class CvCapture_Images : public CvCapture
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{
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public:
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CvCapture_Images()
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{
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filename = 0;
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currentframe = firstframe = 0;
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length = 0;
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frame = 0;
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}
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virtual ~CvCapture_Images()
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{
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close();
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}
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virtual bool open(const char* _filename);
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virtual void close();
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virtual double getProperty(int);
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virtual bool setProperty(int, double);
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virtual bool grabFrame();
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virtual IplImage* retrieveFrame(int);
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protected:
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char* filename; // actually a printf-pattern
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unsigned currentframe;
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unsigned firstframe; // number of first frame
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unsigned length; // length of sequence
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IplImage* frame;
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};
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void CvCapture_Images::close()
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{
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if( filename )
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{
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free(filename);
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filename = 0;
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}
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currentframe = firstframe = 0;
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length = 0;
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cvReleaseImage( &frame );
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}
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bool CvCapture_Images::grabFrame()
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{
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char str[_MAX_PATH];
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sprintf(str, filename, firstframe + currentframe);
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cvReleaseImage(&frame);
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frame = cvLoadImage(str, CV_LOAD_IMAGE_ANYDEPTH | CV_LOAD_IMAGE_ANYCOLOR);
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if( frame )
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currentframe++;
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return frame != 0;
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}
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IplImage* CvCapture_Images::retrieveFrame(int)
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{
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return frame;
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}
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double CvCapture_Images::getProperty(int id)
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{
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switch(id)
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{
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case CV_CAP_PROP_POS_MSEC:
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CV_WARN("collections of images don't have framerates\n");
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return 0;
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case CV_CAP_PROP_POS_FRAMES:
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return currentframe;
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case CV_CAP_PROP_POS_AVI_RATIO:
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return (double)currentframe / (double)(length - 1);
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case CV_CAP_PROP_FRAME_WIDTH:
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return frame ? frame->width : 0;
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case CV_CAP_PROP_FRAME_HEIGHT:
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return frame ? frame->height : 0;
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case CV_CAP_PROP_FPS:
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CV_WARN("collections of images don't have framerates\n");
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return 1;
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case CV_CAP_PROP_FOURCC:
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CV_WARN("collections of images don't have 4-character codes\n");
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return 0;
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}
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return 0;
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}
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bool CvCapture_Images::setProperty(int id, double value)
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{
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switch(id)
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{
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case CV_CAP_PROP_POS_MSEC:
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case CV_CAP_PROP_POS_FRAMES:
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if(value < 0) {
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CV_WARN("seeking to negative positions does not work - clamping\n");
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value = 0;
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}
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if(value >= length) {
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CV_WARN("seeking beyond end of sequence - clamping\n");
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value = length - 1;
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}
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currentframe = cvRound(value);
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return true;
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case CV_CAP_PROP_POS_AVI_RATIO:
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if(value > 1) {
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CV_WARN("seeking beyond end of sequence - clamping\n");
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value = 1;
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} else if(value < 0) {
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CV_WARN("seeking to negative positions does not work - clamping\n");
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value = 0;
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}
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currentframe = cvRound((length - 1) * value);
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return true;
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}
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CV_WARN("unknown/unhandled property\n");
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return false;
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}
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static char* icvExtractPattern(const char *filename, unsigned *offset)
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{
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char *name = (char *)filename;
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if( !filename )
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return 0;
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// check whether this is a valid image sequence filename
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char *at = strchr(name, '%');
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if(at)
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{
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int dummy;
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if(sscanf(at + 1, "%ud", &dummy) != 1)
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return 0;
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name = strdup(filename);
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}
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else // no pattern filename was given - extract the pattern
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{
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at = name;
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// ignore directory names
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char *slash = strrchr(at, '/');
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if (slash) at = slash + 1;
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#ifdef _WIN32
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slash = strrchr(at, '\\');
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if (slash) at = slash + 1;
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#endif
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while (*at && !isdigit(*at)) at++;
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if(!*at)
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return 0;
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sscanf(at, "%u", offset);
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int size = (int)strlen(filename) + 20;
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name = (char *)malloc(size);
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strncpy(name, filename, at - filename);
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name[at - filename] = 0;
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strcat(name, "%0");
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int i;
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char *extension;
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for(i = 0, extension = at; isdigit(at[i]); i++, extension++)
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;
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char places[10];
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sprintf(places, "%dd", i);
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strcat(name, places);
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strcat(name, extension);
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}
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return name;
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}
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bool CvCapture_Images::open(const char * _filename)
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{
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unsigned offset = 0;
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close();
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filename = icvExtractPattern(_filename, &offset);
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if(!filename)
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return false;
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// determine the length of the sequence
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length = 0;
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char str[_MAX_PATH];
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for(;;)
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{
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sprintf(str, filename, offset + length);
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struct stat s;
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if(stat(str, &s))
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{
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if(length == 0 && offset == 0) // allow starting with 0 or 1
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{
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offset++;
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continue;
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}
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}
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if(!cvHaveImageReader(str))
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break;
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length++;
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}
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if(length == 0)
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{
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close();
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return false;
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}
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firstframe = offset;
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return true;
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}
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CvCapture* cvCreateFileCapture_Images(const char * filename)
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{
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CvCapture_Images* capture = new CvCapture_Images;
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if( capture->open(filename) )
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return capture;
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delete capture;
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return 0;
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}
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//
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//
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// image sequence writer
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//
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//
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class CvVideoWriter_Images : public CvVideoWriter
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{
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public:
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CvVideoWriter_Images()
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{
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filename = 0;
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currentframe = 0;
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}
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virtual ~CvVideoWriter_Images() { close(); }
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virtual bool open( const char* _filename );
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virtual void close();
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virtual bool writeFrame( const IplImage* );
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protected:
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char* filename;
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unsigned currentframe;
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};
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bool CvVideoWriter_Images::writeFrame( const IplImage* image )
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{
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char str[_MAX_PATH];
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sprintf(str, filename, currentframe);
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int ret = cvSaveImage(str, image);
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currentframe++;
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return ret > 0;
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}
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void CvVideoWriter_Images::close()
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{
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if( filename )
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{
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free( filename );
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filename = 0;
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}
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currentframe = 0;
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}
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bool CvVideoWriter_Images::open( const char* _filename )
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{
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unsigned offset = 0;
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close();
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filename = icvExtractPattern(_filename, &offset);
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if(!filename)
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return false;
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char str[_MAX_PATH];
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sprintf(str, filename, 0);
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if(!cvHaveImageWriter(str))
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{
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close();
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return false;
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}
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currentframe = offset;
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return true;
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}
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CvVideoWriter* cvCreateVideoWriter_Images( const char* filename )
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{
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CvVideoWriter_Images *writer = new CvVideoWriter_Images;
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if( writer->open( filename ))
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return writer;
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delete writer;
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return 0;
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}
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