arduino-audio-tools
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Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
PDMMonoStreamT< T > Class Template Reference

Applies low pass filter to a decimated pdm signal to convert it to pcm. More...

#include <PDMStream.h>

Inheritance diagram for PDMMonoStreamT< T >:
AudioStream BaseStream AudioInfoSupport AudioInfoSource Stream Print

Public Member Functions

 PDMMonoStreamT (Stream &in)
 
virtual void addNotifyAudioChange (AudioInfoSupport &bi)
 Adds target to be notified about audio changes.
 
virtual AudioInfo audioInfo () override
 provides the actual input AudioInfo
 
virtual AudioInfo audioInfoOut ()
 provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream
 
AudioInfo audioInfoPDM ()
 
int available ()
 
virtual int availableForWrite () override
 
bool begin ()
 
bool begin (AudioInfo info)
 
virtual void clearNotifyAudioChange ()
 Deletes all change notify subscriptions.
 
int decimation ()
 
virtual void end ()
 
virtual void flush () override
 
bool isNotifyActive ()
 Checks if the automatic AudioInfo update is active.
 
virtual operator bool ()
 
size_t readBytes (uint8_t *data, size_t len)
 
virtual size_t readSilence (uint8_t *buffer, size_t length)
 Source to generate silence: just sets the buffer to 0.
 
virtual bool removeNotifyAudioChange (AudioInfoSupport &bi)
 Removes a target in order not to be notified about audio changes.
 
virtual void setAudioInfo (AudioInfo newInfo) override
 Defines the input AudioInfo.
 
void setDecimationFactor (int factor)
 
template<size_t B>
void setFilterValues (const T(&b)[B])
 
void setNotifyActive (bool flag)
 Deactivate/Reactivate automatic AudioInfo updates: (default is active)
 
virtual size_t write (const uint8_t *data, size_t len) override
 
virtual size_t write (uint8_t ch) override
 
virtual void writeSilence (size_t len)
 Writes len bytes of silence (=0).
 

Protected Member Functions

constexpr int8_t bitsPerSample ()
 
virtual int not_supported (int out, const char *msg="")
 
void notifyAudioChange (AudioInfo info)
 
void refillReadBuffer ()
 

Protected Attributes

int _timeout = 10
 
float coef [19]
 
int decimation_factor = sizeof(T) * 2
 
DecimationStreamExt< Tdecimation_stream
 
FIR< floatfir {coef}
 
FilteredStream< T, floatin_filtered {decimation_stream, 1}
 
AudioInfo info
 
bool is_notify_active = true
 
Vector< AudioInfoSupport * > notify_vector
 
RingBuffer< uint8_ttmp_in {0}
 
RingBuffer< uint8_ttmp_out {0}
 

Detailed Description

template<typename T>
class audio_tools::PDMMonoStreamT< T >

Applies low pass filter to a decimated pdm signal to convert it to pcm.

Author
Phil Schatzmann

Member Function Documentation

◆ addNotifyAudioChange()

virtual void addNotifyAudioChange ( AudioInfoSupport bi)
inlinevirtualinherited

◆ audioInfo()

virtual AudioInfo audioInfo ( )
inlineoverridevirtualinherited

◆ audioInfoOut()

virtual AudioInfo audioInfoOut ( )
inlinevirtualinherited

◆ available()

template<typename T >
int available ( )
inlinevirtual

Reimplemented from BaseStream.

◆ availableForWrite()

virtual int availableForWrite ( )
inlineoverridevirtualinherited

◆ begin()

template<typename T >
bool begin ( )
inlinevirtual

Reimplemented from BaseStream.

◆ end()

virtual void end ( )
inlinevirtualinherited

◆ flush()

virtual void flush ( )
inlineoverridevirtualinherited

Reimplemented from Print.

Reimplemented in ResampleStream, ICYStreamBuffered, BufferedTaskStream, and BufferedStream.

◆ operator bool()

virtual operator bool ( )
inlinevirtualinherited

Reimplemented in A2DPStream, Pipeline, I2SStream, and MemoryStream.

◆ readBytes()

template<typename T >
size_t readBytes ( uint8_t data,
size_t  len 
)
inlinevirtual

Reimplemented from AudioStream.

◆ setAudioInfo()

virtual void setAudioInfo ( AudioInfo  info)
inlineoverridevirtualinherited

◆ write() [1/2]

virtual size_t write ( const uint8_t data,
size_t  len 
)
inlineoverridevirtualinherited

◆ write() [2/2]

virtual size_t write ( uint8_t  ch)
inlineoverridevirtualinherited

Reimplemented in BufferedTaskStream, and BufferedStream.

Member Data Documentation

◆ coef

template<typename T >
float coef[19]
protected
Initial value:
= {
-0.000704420658475743, -0.000537879918926308, 0.004114637509913062,
-0.012685775806621488, 0.027889173789107543, -0.049285026985058301,
0.074005079283040689, -0.097330704866957815, 0.114052040962871595,
0.880965753382213723, 0.114052040962871595, -0.097330704866957843,
0.074005079283040717, -0.049285026985058301, 0.027889173789107550,
-0.012685775806621504, 0.004114637509913064, -0.000537879918926308,
-0.000704420658475743}

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