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Merge pull request #35 from Ahbee/copychannel

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adds function StkFrames::copyChannel
This commit is contained in:
garyscavone
2014-09-19 08:21:56 -04:00
parent d959a1167d 6094f40399
commit aae7f609cf
2 changed files with 36 additions and 0 deletions
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8
include/Stk.h
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@@ -373,6 +373,14 @@ public:
*/ */
void resize( size_t nFrames, unsigned int nChannels, StkFloat value ); void resize( size_t nFrames, unsigned int nChannels, StkFloat value );
//! Copies a single channel
/*!
Copies the specified \c channel into \c destinationFrames's \c destinationChannel. \c destinationChannel must be between 0 and destination.channels() - 1 and
\c channel must be between 0 and channels() - 1. destination.frames() must be >= frames().
No range checking is performed unless _STK_DEBUG_ is defined.
*/
StkFrames& copyChannel(unsigned int channel,StkFrames& destinationFrames, unsigned int destinationChannel) const;
//! Return the number of channels represented by the data. //! Return the number of channels represented by the data.
unsigned int channels( void ) const { return nChannels_; }; unsigned int channels( void ) const { return nChannels_; };

28
src/Stk.cpp
View File

@@ -316,6 +316,34 @@ void StkFrames :: resize( size_t nFrames, unsigned int nChannels, StkFloat value
for ( size_t i=0; i<size_; i++ ) data_[i] = value; for ( size_t i=0; i<size_; i++ ) data_[i] = value;
} }
StkFrames& StkFrames::copyChannel(unsigned int sourceChannel,StkFrames& destinationFrames, unsigned int destinationChannel) const
{
#if defined(_STK_DEBUG_)
if (sourceChannel > channels() - 1) {
std::ostringstream error;
error << "StkFrames::copyChannel invalid sourceChannel (" << sourceChannel << ")";
Stk::handleError( error.str(), StkError::FUNCTION_ARGUMENT);
}
if (destinationChannel > destinationFrames.channels() - 1) {
std::ostringstream error;
error << "StkFrames::copyChannel invalid destinationChannel (" << destinationChannel << ")";
Stk::handleError( error.str(), StkError::FUNCTION_ARGUMENT );
}
if (destinationFrames.frames() < frames()) {
std::ostringstream error;
error << "StkFrames::copyChannel destination.frames() < frames()";
Stk::handleError( error.str(), StkError::MEMORY_ACCESS);
}
#endif
int sourceHop = nChannels_;
int destinationHop = destinationFrames.nChannels_;
for (int i = sourceChannel, j= destinationChannel; i < nFrames_ * nChannels_; i+=sourceHop,j+=destinationHop) {
destinationFrames[j] = data_[i];
}
return destinationFrames;
}
StkFloat StkFrames :: interpolate( StkFloat frame, unsigned int channel ) const StkFloat StkFrames :: interpolate( StkFloat frame, unsigned int channel ) const
{ {