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#ifndef AUDIOGRAPHER_SNDFILE_READER_H
#define AUDIOGRAPHER_SNDFILE_READER_H
#include "audiographer/utils/listed_source.h"
#include "audiographer/process_context.h"
#include "audiographer/sndfile/sndfile_base.h"
namespace AudioGrapher
{
/** Reader for audio files using libsndfile.
* Only short, int and float are valid template parameters
*/
template<typename T = DefaultSampleType>
class SndfileReader
: public virtual SndfileBase
, public ListedSource<T>
, public Throwing<>
{
public:
SndfileReader (std::string const & path) : SndfileHandle (path) {}
virtual ~SndfileReader () {}
SndfileReader (SndfileReader const & other) : SndfileHandle (other) {}
using SndfileHandle::operator=;
/** Read data into buffer in \a context, only the data is modified (not sample count)
* Note that the data read is output to the outputs, as well as read into the context
* \return number of samples read
*/
samplecnt_t read (ProcessContext<T> & context)
{
if (throw_level (ThrowStrict) && context.channels() != channels() ) {
throw Exception (*this, boost::str (boost::format
("Wrong number of channels given to process(), %1% instead of %2%")
% context.channels() % channels()));
}
samplecnt_t const samples_read = SndfileHandle::read (context.data(), context.samples());
ProcessContext<T> c_out = context.beginning (samples_read);
if (samples_read < context.samples()) {
c_out.set_flag (ProcessContext<T>::EndOfInput);
}
this->output (c_out);
return samples_read;
}
protected:
/// SndfileHandle has to be constructed directly by deriving classes
SndfileReader () {}
};
} // namespace
#endif // AUDIOGRAPHER_SNDFILE_READER_H
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