Thumbnail* PreviewingFile::getPreview(VideoBackendIFace* videoBackend, uint minVariance, unsigned int maxTries, float sequenceIndex) {
kDebug() << "getPreview with minVariance: " << minVariance << " and max tries: " << maxTries << endl;
ThumbnailsMap thumbnailsMap;
unsigned int useStart = 25;
unsigned int useEnd = 75;
if(sequenceIndex) {
const unsigned int startPercent = 5;
const unsigned int endPercent = 85;
const unsigned int sequenceLength = 8; //Count of indices needed to iterate through the whole video once
//Compute sequence start between 5 and 85%
const unsigned int posPercent = (unsigned long)(startPercent+(modulo1((sequenceIndex / float(sequenceLength))) * (endPercent-startPercent) ) );
//Create random frames within the bound of ten percent around the sequence position
//This means that the first frame is between 5% and 15%, the second between 15% and 25%, the third between 25% and 35%, etc.
useStart = posPercent;
useEnd = posPercent+10;
}
RandomFrameSelector randomFrameSelector(useStart, useEnd);
PlainFrameSelector plainFrameSelector(10000);
FrameSelector *frameSelector = &randomFrameSelector;
while(! thumbnailsMap.hasAGoodImageOrSurrenders(minVariance, maxTries)) {
Thumbnail *currentFrame=videoBackend->preview(frameSelector);
thumbnailsMap.addThumbnail( currentFrame );
kDebug() << "try " << thumbnailsMap.size() << ", image variance: " << currentFrame->getVariance() << endl;
if(thumbnailsMap.size()>=maxTries-1 && !sequenceIndex) frameSelector=&plainFrameSelector;
}
return thumbnailsMap.getBestThumbnail();
}
void initGPIO(int nGpio, int modulo, int direction){
switch(modulo){
case MODULO_0:
GPIO0_ModuleClkConfig();
modulo0(nGpio);
break;
case MODULO_1:
GPIO1_ModuleClkConfig();
modulo1(nGpio);
break;
case MODULO_2:
GPIO2_ModuleClkConfig();
modulo2(nGpio);
break;
case MODULO_3:
GPIO3_ModuleClkConfig();
modulo3(nGpio);
break;
}
/* Enabling the GPIO module. */
GPIOModuleEnable(GPIO_INSTANCE_ADDRESS(modulo));
/* Resetting the GPIO module. */
//GPIOModuleReset(GPIO_INSTANCE_ADDRESS(modulo));
/* Setting the GPIO pin as an output pin. */
GPIODirModeSet(GPIO_INSTANCE_ADDRESS(modulo),
GPIO_INSTANCE_PIN_NUMBER(nGpio),
direction);
}
