ESP  0.1
The Example-based Sensor Predictions (ESP) system tries to bring machine learning to the maker community.
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AudioFileStream Class Reference

Input stream for getting the FFT spectrum of an audio file as it plays. This class plays an audio file and supplies its 1024-sample / 512-bin FFT spectrum as input to the current pipeline. The spectrum is supplied every ~23 milliseconds (i.e. 441000 KHz / 1024 = ~43 Hz). More...

#include <istream.h>

Inheritance diagram for AudioFileStream:
InputStream Stream

Public Member Functions

 AudioFileStream (char *file, bool loop=false)
 
virtual bool start () final
 
virtual void stop () final
 
virtual int getNumInputDimensions () final
 
- Public Member Functions inherited from InputStream
 InputStream ()
 
virtual ~InputStream ()=default
 
virtual int getNumOutputDimensions ()
 
void useNormalizer (normalizeFunc f)
 
void useNormalizer (vectorNormalizeFunc f)
 
void onDataReadyEvent (onDataReadyCallback callback)
 
template<typename T1 , typename arg , class T >
void onDataReadyEvent (T1 *owner, void(T::*listenerMethod)(arg))
 
void setLabelsForAllDimensions (const vector< string > labels)
 
void setLabelsForAllDimensions (std::initializer_list< string > list)
 
const vector< string > & getLabels () const
 
- Public Member Functions inherited from Stream
 Stream ()
 
void toggle ()
 
bool hasStarted ()
 

Additional Inherited Members

- Public Types inherited from InputStream
using normalizeFunc = std::function< double(double)>
 
using vectorNormalizeFunc = std::function< vector< double >(vector< double >)>
 
typedef std::function< void(GRT::MatrixDouble)> onDataReadyCallback
 
- Protected Member Functions inherited from InputStream
vector< double > normalize (vector< double >)
 
- Protected Attributes inherited from InputStream
vector< string > InputStream_labels_
 
onDataReadyCallback data_ready_callback_
 
normalizeFunc normalizer_
 
vectorNormalizeFunc vectorNormalizer_
 
- Protected Attributes inherited from Stream
std::atomic_bool has_started_
 

Detailed Description

Input stream for getting the FFT spectrum of an audio file as it plays. This class plays an audio file and supplies its 1024-sample / 512-bin FFT spectrum as input to the current pipeline. The spectrum is supplied every ~23 milliseconds (i.e. 441000 KHz / 1024 = ~43 Hz).

Constructor & Destructor Documentation

AudioFileStream::AudioFileStream ( char *  file,
bool  loop = false 
)

Member Function Documentation

int AudioFileStream::getNumInputDimensions ( )
finalvirtual

Get the number of dimensions of the data that's provided by the input stream (before it's run through the normalizer, if any).

Implements InputStream.

bool AudioFileStream::start ( )
finalvirtual

Start the stream.

Reimplemented from Stream.

void AudioFileStream::stop ( )
finalvirtual

Reimplemented from Stream.

The documentation for this class was generated from the following files: