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#! /usr/bin/env python
"""
This script will test highgui's cvRetrieveFrame function
"""
# name of this test and it's requirements
TESTNAME = "cvRetrieveFrame"
REQUIRED = ["cvGrabFrame"]
# needed for sys.exit(int) and .works file handling
import os
import sys
import works
# path to imagefiles we need
PREFIX=os.path.join(os.environ["srcdir"],"../../opencv_extra/testdata/python/videos/")
# check requirements and delete old flag file, if it exists
if not works.check_files(REQUIRED,TESTNAME):
sys.exit(77)
# import the necessary things for OpenCV
from highgui import *
from cv import *
# create a video reader using the tiny video 'uncompressed.avi'
video = cvCreateFileCapture(PREFIX+"uncompressed.avi")
# call cvGrabFrame to grab a frame from video
res=cvGrabFrame(video)
if res==0:
print "(ERROR) Couldn't call cvGrabFrame()"
sys.exit(1)
# call cvRetrieveFrame and check if returned image is valid
image = cvRetrieveFrame(video)
if image is None:
# returned image is not a correct IplImage (pointer),
# so return an error code
sys.exit(1)
# ATTENTION: We do not release the video reader or image.
# This is bad manners, but Python and OpenCV don't care...
# create flag file for sollowing tests
works.set_file(TESTNAME)
# return 0 ('PASS')
sys.exit(0)
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