void VideoDevice::configure(const Misc::ConfigurationFileSection& cfg)
{
/* Check which components of the video format are stored in the configuration file section: */
unsigned int frameSize[2]={0,0};
bool haveFrameSize=false;
if(cfg.hasTag("./width")&&cfg.hasTag("./height"))
{
/* Read the requested frame size as width and height: */
frameSize[0]=cfg.retrieveValue<unsigned int>("./width");
frameSize[1]=cfg.retrieveValue<unsigned int>("./height");
haveFrameSize=true;
}
if(cfg.hasTag("./frameSize"))
{
/* Read the requested frame size as a two-element array: */
Misc::CFixedArrayValueCoder<unsigned int,2> valueCoder(frameSize);
cfg.retrieveValueWC<unsigned int*>("./frameSize",valueCoder);
haveFrameSize=true;
}
double frameRate=0.0;
bool haveFrameRate=false;
if(cfg.hasTag("./frameRate"))
{
/* Read the requested frame rate as a double: */
frameRate=cfg.retrieveValue<double>("./frameRate");
haveFrameRate=true;
}
unsigned int pixelFormat=0;
bool havePixelFormat=false;
if(cfg.hasTag("./pixelFormat"))
{
/* Read a pixel format as a FourCC code: */
std::string fourCC=cfg.retrieveValue<std::string>("./pixelFormat");
if(fourCC.size()!=4)
Misc::throwStdErr("Video::VideoDevice::configure: Invalid pixel format code \"%s\"",fourCC.c_str());
/* Convert the FourCC code to a pixel format: */
VideoDataFormat temp;
temp.setPixelFormat(fourCC.c_str());
pixelFormat=temp.pixelFormat;
havePixelFormat=true;
}
if(cfg.hasTag("./pixelFormatHex"))
{
/* Read a pixel format as a hexadecimal number: */
std::string hex=cfg.retrieveString("./pixelFormatHex");
if(hex.size()!=8)
Misc::throwStdErr("Video::VideoDevice::configure: Invalid hexadecimal pixel format code \"%s\"",hex.c_str());
for(int i=0;i<8;++i)
{
if(hex[i]>='0'&&hex[i]<='9')
pixelFormat=(pixelFormat<<4)|(hex[i]-'0');
else if(hex[i]>='A'&&hex[i]<='F')
pixelFormat=(pixelFormat<<4)|(hex[i]-'A'+10);
else if(hex[i]>='a'&&hex[i]<='f')
pixelFormat=(pixelFormat<<4)|(hex[i]-'a'+10);
else
Misc::throwStdErr("Video::VideoDevice::configure: Invalid hexadecimal pixel format code \"%s\"",hex.c_str());
}
havePixelFormat=true;
}
/* Get the list of the device's supported video formats: */
std::vector<VideoDataFormat> deviceFormats=getVideoFormatList();
/* Find the best-matching video format among the device's advertised formats: */
std::vector<VideoDataFormat>::iterator bestFormat=deviceFormats.end();
double bestMatch=0.0;
for(std::vector<VideoDataFormat>::iterator dfIt=deviceFormats.begin();dfIt!=deviceFormats.end();++dfIt)
{
double match=1.0;
if(haveFrameSize)
for(int i=0;i<2;++i)
match*=dfIt->size[i]>=frameSize[i]?double(frameSize[i])/double(dfIt->size[i]):double(dfIt->size[i])/double(frameSize[i]);
if(haveFrameRate)
{
double dfRate=double(dfIt->frameIntervalDenominator)/double(dfIt->frameIntervalCounter);
match*=dfRate>=frameRate?frameRate/dfRate:dfRate/frameRate;
}
if(havePixelFormat&&dfIt->pixelFormat!=pixelFormat)
match*=0.75;
if(bestMatch<match)
{
bestFormat=dfIt;
bestMatch=match;
}
}
if(bestFormat==deviceFormats.end()) // Can only happen if there are no device formats
throw std::runtime_error("Video::VideoDevice::configure: No matching video formats found");
/* Set the selected video format: */
setVideoFormat(*bestFormat);
}
void VideoDevice::configure(const Misc::ConfigurationFileSection& cfg)
{
/* Get the device's current video format to use as default: */
VideoDataFormat currentFormat=getVideoFormat();
/* Get the list of the device's supported video formats: */
std::vector<VideoDataFormat> deviceFormats=getVideoFormatList();
/* Read the requested frame size: */
currentFormat.size[0]=cfg.retrieveValue<unsigned int>("./width",currentFormat.size[0]);
currentFormat.size[1]=cfg.retrieveValue<unsigned int>("./height",currentFormat.size[1]);
/* Find the best-matching frame size among the supported video formats: */
std::vector<VideoDataFormat>::iterator bestSizeMatch=deviceFormats.end();
double bestSizeMatchRatio=1.0e10;
for(std::vector<VideoDataFormat>::iterator dfIt=deviceFormats.begin();dfIt!=deviceFormats.end();++dfIt)
{
/* Calculate the format's size mismatch: */
double sizeMatchRatio=0.0;
for(int i=0;i<2;++i)
{
if(dfIt->size[i]<currentFormat.size[i])
sizeMatchRatio+=double(currentFormat.size[i])/double(dfIt->size[i]);
else
sizeMatchRatio+=double(dfIt->size[i])/double(currentFormat.size[i]);
}
if(bestSizeMatchRatio>sizeMatchRatio)
{
bestSizeMatch=dfIt;
bestSizeMatchRatio=sizeMatchRatio;
}
}
currentFormat.size[0]=bestSizeMatch->size[0];
currentFormat.size[1]=bestSizeMatch->size[1];
/* Read the requested frame rate: */
double frameRate=cfg.retrieveValue<double>("./frameRate",double(currentFormat.frameIntervalDenominator)/double(currentFormat.frameIntervalCounter));
/* Find the best-matching frame rate among the supporting video formats: */
std::vector<VideoDataFormat>::iterator bestRateMatch=deviceFormats.end();
double bestRateMatchRatio=1.0e10;
for(std::vector<VideoDataFormat>::iterator dfIt=deviceFormats.begin();dfIt!=deviceFormats.end();++dfIt)
if(dfIt->size[0]==currentFormat.size[0]&&dfIt->size[1]==currentFormat.size[1])
{
/* Calculate the format's frame rate mismatch: */
double rate=double(dfIt->frameIntervalDenominator)/double(dfIt->frameIntervalCounter);
double rateMatchRatio;
if(rate<frameRate)
rateMatchRatio=frameRate/rate;
else
rateMatchRatio=rate/frameRate;
if(bestRateMatchRatio>rateMatchRatio)
{
bestRateMatch=dfIt;
bestRateMatchRatio=rateMatchRatio;
}
}
currentFormat.pixelFormat=bestRateMatch->pixelFormat;
currentFormat.frameIntervalCounter=bestRateMatch->frameIntervalCounter;
currentFormat.frameIntervalDenominator=bestRateMatch->frameIntervalDenominator;
/* Set the selected video format: */
setVideoFormat(currentFormat);
}