A collection of routines dealing with processing, analyzing and interpretation of audio data. More...

#include <VisualAudioLab.h>

Classes
struct	BeatGuess
	Struct with values concerning beat estimation. More...
struct	RMSValue
	Struct with values concerning rms (root mean square) values. More...
Public Member Functions
void	processAudioData (const VisualAudioData &visualAudioData)
	Processes the audio data chunks.
void	resetData (void)
	Resets the stored values of the VisualAudioLab.
uint32	getCurrTimestampIDOfAudioData (void)
	Returns the last processed timestampID of the kVisualPluginPulseMessage.
void	setCurrTimestampIDOfAudioData (const uint32 timestampID)
	Sets the last processed timestampID of the kVisualPluginPulseMessage.
void	setTotalTimeOfCurrentTrack (const uint32 totalTimeInMS)
	Stores the total time of the current track.
void	setStartTimeOfCurrentTrack (const uint32 startTimeInMS)
	Stores the start time of the current track.
void	setStopTimeOfCurrentTrack (const uint32 stopTimeInMS)
	Stores the stop time of the current track.
bool	remainingTimeOfCurrentTrackIsKnown (void)
	Answers the question whether the remaining time of the current track is known.
uint32	getRemainingTimeOfCurrentTrack (void)
	Returns the remaining time of the currently playing audio track measured in milliseconds.
uint32	getTotalTimeOfCurrentTrack (void)
	Returns the total time of the currently playing audio track measured in milliseconds.
sint16	getCurrMusicDataHistory (void)
	Returns the current music data history.
sint16	getPrevMusicDataHistory (void)
	Returns the previous music data history.
uint8	getRMSIntensity (void)
	Returns the RMS (root-mean-square) intensity.
uint8	getWaveformDataOfChannelAtIndex (const uint16 channel, const uint16 index)
	Returns the single waveform data of a specific channel at a specific index position.
const uint8 ***const	getSpectrumDataArray (void)
	Returns a pointer to the spectrum data array.
const sint16 **const	getWaveformDataMonoArray (void)
	Returns a pointer to the mono waveform data array.
uint8	getMonoWaveformDataAtIndex (const uint16 index)
	Returns the waveform data value of a specific index position.
uint8	getWaveformDataOfChannelAtIndexWithHistoryNum (const uint16 channel, const uint16 index, const uint16 historyNum)
	Returns the waveform data of a specific channel of a specific history at a specific index.
uint8	getMonoWaveformDataAtIndexWithHistoryNum (const uint16 index, const uint16 historyNum)
	Returns the mono waveform data of a specific history at a specific index.
uint8	getDCIntensity (void)
	Returns the DC intensity.
void	checkForBeatImpulse (void)
	Checks for the beat impulse and sends a notification in case a beat impulse is detected.
uint8	getBeatMeter (void)
	Answers the question whether the current timestamp suggests a beat impulse.
void	HannWindow (const int N, double TimeSamples[])
	Processes the sample data with a Hann window.
const sint8 *const	getWaveformShapeArray (void)
	Returns a pointer to the waveform shape array.
uint32	getNumberOfAudioSpectrumDataEntries (void)
	Returns the number of audio spectrum data entries.
uint32	getNumberOfWaveformEntries (void)
	Returns the number of waveform data entries.
uint32	getNumberOfSpectrumEntries (void)
	Returns the number of spectrum data entries.
uint16	getMaxNumberOfWaveformShapeHistory (void)
	Returns the maximum history number.
uint16	getNumberOfDataChannels (void)
	Returns the number of data channels.
uint16	getMaxNumberOfMusicDataHistories (void)
	Returns the maximum number of histories in waveform data.
const uint32 *const	getBeatHistogram (void)
	Returns a pointer to the histogram of the gaps between detected beat events.
Static Public Member Functions
static VisualAudioLab *	getInstance (void)
	Returns the VisualAudioLab.
static void	dispose (void)
	Disposes the VisualAudiolab.
static void	setMaxNumberOfAudioDataChannels (uint16 aNumberOfMaxAudioDataChannels)
	Sets the maximum number of audio data channels (2 channels means stereo).
static void	setNumberOfAudioWaveformDataEntries (uint32 aNumberOfAudioWaveformDataEntries)
	Sets the number of audio waveform data entries.
static void	setNumberOfAudioSpectrumDataEntries (uint32 aNumberOfAudioSpectrumDataEntries)
	Sets the number of audio spectrum data entries.
Private Member Functions
	VisualAudioLab ()
	The constructor.
	~VisualAudioLab ()
	The destructor.
	VisualAudioLab (const VisualAudioLab &other)
	Copy constructor.
VisualAudioLab &	operator= (const VisualAudioLab &other)
	Assignment operator.
void	init (void)
	Allocates and initializes the buffers of the VisualAudioLab.
void	processWaveformData (uint8 numWaveformChannels, uint16 numWaveformEntries, const uint8 *const currWaveformData)
	Processes the waveform data.
void	processSpectrumData (const uint8 numSpectrumChannels, const uint16 numSpectrumEntries, const uint8 *const currSpectrumData)
	Processes the spectrum data.
void	incrementMusicDataHistory (void)
	Increments the current history number of music data.
void	storeBeatImpulse (bool beatImpulse)
	Stores the beat impulse.
void	addToWaveformShape (sint8 minWaveformPoint, sint8 maxWaveformPoint)
	Adds the minimum and maximum waveform data value to the waveform shape.
void	addToBeatRecords (void)
	Adds a value to beatsRecordedInBeatAnalyseTimeFrame.
void	addToBeatGapHistogram (uint16 gapInMilliseconds)
	Adds a value to beatGapHistogram.
void	resetBeatGapHistogram (void)
	Resets the beatGapHistogram.
void	calcBeatConfidence (void)
	Calculates the confidence of the beat estimation.
uint32	getBestBeatMSInterval (void)
	Returns the best guess for the beat interval in milliseconds.
uint8	isBeatMeter (uint32 elapsedMSSinceStartOfTrack)
Private Attributes
uint32	totalTimeOfTrack
	The total time of the currently playing audio track measured in milliseconds.
uint32	elapsedTimeOfTrack
	The accumulated play time of the current audio track measured in milliseconds.
uint32	startTimeOfTrack
	The start time of the currently playing audio track measured in milliseconds.
uint32	stopTimeOfTrack
	The stop time of the currently playing audio track measured in milliseconds.
uint32	currTimestampIDOfAudioData
	The last processed timestampID of the kVisualPluginPulseMessage.
sint8	numberOfMusicDataHistoryInt
	The number of music data history.
sint8 ***	waveformData
	The waveform data array.
sint16 **	waveformDataMono
	The mono waveform data array.
uint8 ***	spectrumData
	The spectrum data array.
double *	amplitudeEnvelope
	The amplitude envelope array.
sint32 *	mean
	The mean values.
double *	tappingBuffer
	A special buffer for beat detection.
double **	rms
	The rms values.
double *	rmsMono
	The mono rms values.
double	rmsMonoAvg
	The average rms value.
uint32 *	beatGapHistogram
	A histogram of the gaps between detected beat events.
uint32	beatTimeDeltaInMS
	The delta between beats.
double	rmsMonoMax
	The maximum mono rms value.
sint16	currMusicDataHistory
	The current history number.
uint8 *	minSpectrumLevel
	The minimum spectrum level.
uint8 *	maxSpectrumLevel
	The maximum spectrum level.
uint8	spectrumDCLevel
	The spectrum DC level.
float	avgSpectrumDCLevel
	The average spectrum DC level.
float	spectrumDCLevelSum
	The sum of the spectrum DC level.
sint8 *	minWaveformVal
	The minimum waveform data value.
sint8 *	maxWaveformVal
	The maximum waveform data value.
sint8	minWaveformValMono
	The minimum mono waveform data value.
sint8	maxWaveformValMono
	The maximum mono waveform data value.
uint32 *	waveformValSum
	The sum of the absolute waveform data values that are higher or lower than 128.
uint32 *	peakWaveformValSum
	The peak values of the sum of the waveform data values.
uint32 *	prevWaveformValSum
	The previous sum of the waveform data values.
uint32 *	avgWaveformValSum
	The average value of the sum of the waveform data values.
uint32 *	avgWaveformValSumCounter
	The counter for the calculation o the average value of the sum of the waveform data values.
bool	isBeatImpulse
	1 if the current waveform data indicates a beat impulse, 0 if not.
RMSValue	rmsBuffer [2000]
	Array containg rms mono values for the last numberOfMillisecondsOfRMSBuffer milliseconds.
uint16	currRMSValue
	The current index of array rmsBuffer.
uint8	currRecordedBeat
	The current index of array beatsRecordedInBeatAnalyseTimeFrame.
BeatGuess *	beatsRecordedInBeatAnalyseTimeFrame
	Array in which the detected beats are stored with their elapsed milliseconds timestamp since start of track.
Static Private Attributes
static VisualAudioLab *	theVisualAudioLab = NULL
	VisualAudioLab is a singleton class.
static uint16	maxNumberOfAudioDataChannels = 0
	The maximum number of audio data channels (2 channels means stereo).
static uint32	numberOfAudioWaveformDataEntries = 0
	The number of audio waveform data entries.
static uint32	numberOfAudioSpectrumDataEntries = 0
	The number of audio spectrum data entries.
static const uint8	beatTimeTolerance = 25
	The smallest time a beat is considered to be the same.
static const uint16	beatThreshold = 300
	The threshold after which we are free to detect a new beat.
static const uint16	beatAnalyseTimeFrame = 10000
	The time frame in which beats are recorded and analysed.
static const uint16	maximumBeatInterval = 2000
	The maximum beat interval.
static const uint16	numberOfMillisecondsOfRMSBuffer = 3000
	The number of milliseconds rms values are collected.
static const uint16	numberOfRMSBufferEntries = 2000
	The number of records in rmsBuffer.
static const uint16	maxNumberOfWaveformShapeHistory = 1400
static const uint16	maxNumberOfMusicDataHistory = 40
static const uint16	tappingBufferLength = 4096
static const uint16	maxNumberOfBeatHistogramBins = 100
static const uint16	maxNumberOfBeatsRecordedInAnalyseTimeframe = 200

Detailed Description

A collection of routines dealing with processing, analyzing and interpretation of audio data.

Constructor & Destructor Documentation

VisualAudioLab::VisualAudioLab ( ) [private]

The constructor.

VisualAudioLab is a singleton class. The constructor is private. New instance of class can only be created internally.

VisualAudioLab::~VisualAudioLab ( ) [private]

The destructor.

VisualAudioLab is a singleton class. The destructor is private. Instance of class can only be destructed internally.

VizKit::VisualAudioLab::VisualAudioLab ( const VisualAudioLab & other ) [private]

Copy constructor.

Parameters:

other Another VisualAudioLab.

Remarks:: Explicitely declared in private section and not implemented to enforce uniqueness of singleton pattern.

Member Function Documentation

void VisualAudioLab::addToBeatGapHistogram ( uint16 gapInMilliseconds ) [private]

Adds a value to beatGapHistogram.

Parameters:

gapInMilliseconds The gap to previous beat detection in milliseconds.

void VisualAudioLab::addToBeatRecords ( void ) [private]

Adds a value to beatsRecordedInBeatAnalyseTimeFrame.

void VizKit::VisualAudioLab::addToWaveformShape	(	sint8	minWaveformPoint,
		sint8	maxWaveformPoint
	)		`[private]`

Adds the minimum and maximum waveform data value to the waveform shape.

Parameters:

minWaveformPoint	The minimum waveform data value.
maxWaveformPoint	The maximum waveform data value.

void VisualAudioLab::calcBeatConfidence ( void ) [private]

Calculates the confidence of the beat estimation.

void VisualAudioLab::checkForBeatImpulse ( void )

Checks for the beat impulse and sends a notification in case a beat impulse is detected.

void VisualAudioLab::dispose ( void ) [static]

Disposes the VisualAudiolab.

const uint32 *const VisualAudioLab::getBeatHistogram ( void )

Returns a pointer to the histogram of the gaps between detected beat events.

Returns:: A pointer to the histogram of the gaps between detected beat events.

uint8 VisualAudioLab::getBeatMeter ( void )

Answers the question whether the current timestamp suggests a beat impulse.

Returns:: 1 if the current timestamp suggests a beat impulse, 0 if not.

uint32 VisualAudioLab::getBestBeatMSInterval ( void ) [private]

Returns the best guess for the beat interval in milliseconds.

The best guess for the beat interval in milliseconds.

sint16 VisualAudioLab::getCurrMusicDataHistory ( void )

Returns the current music data history.

Returns:: The current music data history.

uint32 VisualAudioLab::getCurrTimestampIDOfAudioData ( void )

Returns the last processed timestampID of the kVisualPluginPulseMessage.

Returns:: The last processed timestampID of the kVisualPluginPulseMessage.

uint8 VisualAudioLab::getDCIntensity ( void )

Returns the DC intensity.

The DC intensity is the intensity of the direct current.

Returns:: The DC intensity.

VisualAudioLab * VisualAudioLab::getInstance ( void ) [static]

Returns the VisualAudioLab.

The VisualAudiolab is initialized if required. The VisualAudioLab is a singleton.

uint16 VisualAudioLab::getMaxNumberOfMusicDataHistories ( void )

Returns the maximum number of histories in waveform data.

Returns:: The maximum number of histories in waveform data.

uint16 VisualAudioLab::getMaxNumberOfWaveformShapeHistory ( void )

Returns the maximum history number.

Returns:: The maximum history number.

uint8 VisualAudioLab::getMonoWaveformDataAtIndex ( const uint16 index )

Returns the waveform data value of a specific index position.

Parameters:

index The index of the requested waveform data.

Returns:: The mono waveform data at a specific index.

uint8 VisualAudioLab::getMonoWaveformDataAtIndexWithHistoryNum	(	const uint16	index,
		const uint16	historyNum
	)

Returns the mono waveform data of a specific history at a specific index.

Parameters:

index	The index of the requested waveform data.
historyNum	The history of the requested waveform data.

Returns:: The mono waveform data of a specific history at a specific index.

uint32 VizKit::VisualAudioLab::getNumberOfAudioSpectrumDataEntries ( void )

Returns the number of audio spectrum data entries.

Returns:: The number of audio spectrum data entries.

uint16 VisualAudioLab::getNumberOfDataChannels ( void )

Returns the number of data channels.

Returns:: The number of data channels.

uint32 VisualAudioLab::getNumberOfSpectrumEntries ( void )

Returns the number of spectrum data entries.

Returns:: The number of spectrum data entries.

uint32 VisualAudioLab::getNumberOfWaveformEntries ( void )

Returns the number of waveform data entries.

Returns:: The number of waveform data entries.

sint16 VisualAudioLab::getPrevMusicDataHistory ( void )

Returns the previous music data history.

The previous music data history is the one that was current before the one that is now current.

Returns:: The previous music data history.

uint32 VisualAudioLab::getRemainingTimeOfCurrentTrack ( void )

Returns the remaining time of the currently playing audio track measured in milliseconds.

Returns:: The remaining time of the currently playing audio track measured in milliseconds.

uint8 VisualAudioLab::getRMSIntensity ( void )

Returns the RMS (root-mean-square) intensity.

The RMS intensity is the computed root-mean-square value.

Returns:: The RMS intensity.

const uint8 ***const VisualAudioLab::getSpectrumDataArray ( void )

Returns a pointer to the spectrum data array.

Returns:: A pointer to the spectrum data array.

uint32 VisualAudioLab::getTotalTimeOfCurrentTrack ( void )

Returns the total time of the currently playing audio track measured in milliseconds.

Returns:: The total time of the currently playing audio track measured in milliseconds.

const sint16 **const VisualAudioLab::getWaveformDataMonoArray ( void )

Returns a pointer to the mono waveform data array.

The mono waveform data consists of the averaged values of the waveform data of all available channels.

Returns:: A pointer to the mono waveform data array.

uint8 VisualAudioLab::getWaveformDataOfChannelAtIndex	(	const uint16	channel,
		const uint16	index
	)

Returns the single waveform data of a specific channel at a specific index position.

Parameters:

channel	The channel.
index	The index of the waveform data.

Returns:: The single waveform data of a specific channel at a specific index position.

uint8 VisualAudioLab::getWaveformDataOfChannelAtIndexWithHistoryNum	(	const uint16	channel,
		const uint16	index,
		const uint16	historyNum
	)

Returns the waveform data of a specific channel of a specific history at a specific index.

Parameters:

channel	The cannel of the requested waveform data.
index	The index of the requested waveform data.
historyNum	The history of the requested waveform data.

Returns:: The waveform data of a specific channel of a specific history at a specific index.

const sint8* const VizKit::VisualAudioLab::getWaveformShapeArray ( void )

Returns a pointer to the waveform shape array.

Returns:: A pointer to the waveform shape array.

void VisualAudioLab::HannWindow	(	const int	N,
		double	TimeSamples[]
	)

Processes the sample data with a Hann window.

Parameters:

N	The number of samples.
TimeSamples	The sample data.

void VisualAudioLab::incrementMusicDataHistory ( void ) [private]

Increments the current history number of music data.

Music data is stored for a number of histories.

void VisualAudioLab::init ( void ) [private]

Allocates and initializes the buffers of the VisualAudioLab.

uint8 VisualAudioLab::isBeatMeter ( uint32 elapsedMSSinceStartOfTrack ) [private]

Parameters:

elapsedMSSinceStartOfTrack The number of milliseconds elapsed since start of audio track.

Returns:: 1 if time is in frame of beat meter, 0 if not.

VisualAudioLab& VizKit::VisualAudioLab::operator= ( const VisualAudioLab & other ) [private]

Assignment operator.

Remarks:: Explicitely declared in private section and not implemented to enforce uniqueness of singleton pattern.

void VisualAudioLab::processAudioData ( const VisualAudioData & visualAudioData )

Processes the audio data chunks.

With each PulseMessage iTunes delivers waveform data and spectrum data. The spectrum data is a fft (Fast Fourier Transform) of the waveform data.

Parameters:

visualAudioData Visual audio data.

void VisualAudioLab::processSpectrumData	(	const uint8	numSpectrumChannels,
		const uint16	numSpectrumEntries,
		const uint8 *const	currSpectrumData
	)		`[private]`

Processes the spectrum data.

Parameters:

numSpectrumChannels	The number of spectrum data channels (e.g. two for stereo sound)..
numSpectrumEntries	The number of data points per channel.
currSpectrumData	A pointer to the current spectrum data.

void VisualAudioLab::processWaveformData	(	uint8	numWaveformChannels,
		uint16	numWaveformEntries,
		const uint8 *const	currWaveformData
	)		`[private]`

Processes the waveform data.

Parameters:

numWaveformChannels	The number of waveform data channels (e.g. two for stereo sound).
numWaveformEntries	The number of data points per channel.
currWaveformData	A pointer to the current waveform data.

bool VisualAudioLab::remainingTimeOfCurrentTrackIsKnown ( void )

Answers the question whether the remaining time of the current track is known.

Streamed audio has no info about remaining time of current track.

Returns:: True if the remaining time of the current track is known, false if not.

void VisualAudioLab::resetBeatGapHistogram ( void ) [private]

Resets the beatGapHistogram.

void VisualAudioLab::resetData ( void )

Resets the stored values of the VisualAudioLab.

The VisualAudioLab stores analyzed values of an audio track. Typically the values are resetted when a new track starts playing.

void VisualAudioLab::setCurrTimestampIDOfAudioData ( const uint32 timestampID )

Sets the last processed timestampID of the kVisualPluginPulseMessage.

Parameters:

timestampID The last processed timestampID of the kVisualPluginPulseMessage.

void VisualAudioLab::setMaxNumberOfAudioDataChannels ( uint16 aNumberOfMaxAudioDataChannels ) [static]

Sets the maximum number of audio data channels (2 channels means stereo).

Parameters:

aNumberOfMaxAudioDataChannels The maximum number of audio data channels.

void VisualAudioLab::setNumberOfAudioSpectrumDataEntries ( uint32 aNumberOfAudioSpectrumDataEntries ) [static]

Sets the number of audio spectrum data entries.

Parameters:

aNumberOfAudioSpectrumDataEntries The number of audio spectrum data entries.

void VisualAudioLab::setNumberOfAudioWaveformDataEntries ( uint32 aNumberOfAudioWaveformDataEntries ) [static]

Sets the number of audio waveform data entries.

Parameters:

aNumberOfAudioWaveformDataEntries The number of audio waveform data entries.

void VisualAudioLab::setStartTimeOfCurrentTrack ( const uint32 startTimeInMS )

Stores the start time of the current track.

Parameters:

startTimeInMS The start time of the currently playing audio track measured in milliseconds.

void VisualAudioLab::setStopTimeOfCurrentTrack ( const uint32 stopTimeInMS )

Stores the stop time of the current track.

Parameters:

stopTimeInMS The stop time of the currently playing audio track measured in milliseconds.

void VisualAudioLab::setTotalTimeOfCurrentTrack ( const uint32 totalTimeInMS )

Stores the total time of the current track.

Parameters:

totalTimeInMS The total time of the currently playing audio track measured in milliseconds.

void VisualAudioLab::storeBeatImpulse ( bool beatImpulse ) [private]

Stores the beat impulse.

Parameters:

beatImpulse True if the current waveform data indicates a beat impulse, false if not.

Member Data Documentation

double* VizKit::VisualAudioLab::amplitudeEnvelope [private]

The amplitude envelope array.

float VizKit::VisualAudioLab::avgSpectrumDCLevel [private]

The average spectrum DC level.

uint32* VizKit::VisualAudioLab::avgWaveformValSum [private]

The average value of the sum of the waveform data values.

uint32* VizKit::VisualAudioLab::avgWaveformValSumCounter [private]

The counter for the calculation o the average value of the sum of the waveform data values.

const uint16 VisualAudioLab::beatAnalyseTimeFrame = 10000 [static, private]

The time frame in which beats are recorded and analysed.

Measured in milliseconds.

uint32* VizKit::VisualAudioLab::beatGapHistogram [private]

A histogram of the gaps between detected beat events.

BeatGuess* VizKit::VisualAudioLab::beatsRecordedInBeatAnalyseTimeFrame [private]

Array in which the detected beats are stored with their elapsed milliseconds timestamp since start of track.

Ringbuffer.

const uint16 VisualAudioLab::beatThreshold = 300 [static, private]

The threshold after which we are free to detect a new beat.

Measured in milliseconds.

uint32 VizKit::VisualAudioLab::beatTimeDeltaInMS [private]

The delta between beats.

const uint8 VisualAudioLab::beatTimeTolerance = 25 [static, private]

The smallest time a beat is considered to be the same.

Measured in milliseconds.

sint16 VizKit::VisualAudioLab::currMusicDataHistory [private]

The current history number.

uint8 VizKit::VisualAudioLab::currRecordedBeat [private]

The current index of array beatsRecordedInBeatAnalyseTimeFrame.

uint16 VizKit::VisualAudioLab::currRMSValue [private]

The current index of array rmsBuffer.

uint32 VizKit::VisualAudioLab::currTimestampIDOfAudioData [private]

The last processed timestampID of the kVisualPluginPulseMessage.

uint32 VizKit::VisualAudioLab::elapsedTimeOfTrack [private]

The accumulated play time of the current audio track measured in milliseconds.

bool VizKit::VisualAudioLab::isBeatImpulse [private]

1 if the current waveform data indicates a beat impulse, 0 if not.

const uint16 VisualAudioLab::maximumBeatInterval = 2000 [static, private]

The maximum beat interval.

Measured in milliseconds.

uint16 VisualAudioLab::maxNumberOfAudioDataChannels = 0 [static, private]

The maximum number of audio data channels (2 channels means stereo).

const uint16 VisualAudioLab::maxNumberOfBeatHistogramBins = 100 [static, private]

const uint16 VisualAudioLab::maxNumberOfBeatsRecordedInAnalyseTimeframe = 200 [static, private]

const uint16 VisualAudioLab::maxNumberOfMusicDataHistory = 40 [static, private]

const uint16 VisualAudioLab::maxNumberOfWaveformShapeHistory = 1400 [static, private]

uint8* VizKit::VisualAudioLab::maxSpectrumLevel [private]

The maximum spectrum level.

0-128.

sint8* VizKit::VisualAudioLab::maxWaveformVal [private]

The maximum waveform data value.

0-255. -128 ...127.

sint8 VizKit::VisualAudioLab::maxWaveformValMono [private]

The maximum mono waveform data value.

sint32* VizKit::VisualAudioLab::mean [private]

The mean values.

uint8* VizKit::VisualAudioLab::minSpectrumLevel [private]

The minimum spectrum level.

0-128.

sint8* VizKit::VisualAudioLab::minWaveformVal [private]

The minimum waveform data value.

0-255. -128 ...127.

sint8 VizKit::VisualAudioLab::minWaveformValMono [private]

The minimum mono waveform data value.

uint32 VisualAudioLab::numberOfAudioSpectrumDataEntries = 0 [static, private]

The number of audio spectrum data entries.

uint32 VisualAudioLab::numberOfAudioWaveformDataEntries = 0 [static, private]

The number of audio waveform data entries.

const uint16 VisualAudioLab::numberOfMillisecondsOfRMSBuffer = 3000 [static, private]

The number of milliseconds rms values are collected.

sint8 VizKit::VisualAudioLab::numberOfMusicDataHistoryInt [private]

The number of music data history.

const uint16 VisualAudioLab::numberOfRMSBufferEntries = 2000 [static, private]

The number of records in rmsBuffer.

Must be greater than: Audio sample rate (44100) / kVisualNumWaveformEntries * (numberOfMillisecondsOfRMSBuffer / 1000).

uint32* VizKit::VisualAudioLab::peakWaveformValSum [private]

The peak values of the sum of the waveform data values.

uint32* VizKit::VisualAudioLab::prevWaveformValSum [private]

The previous sum of the waveform data values.

double** VizKit::VisualAudioLab::rms [private]

The rms values.

RMSValue VizKit::VisualAudioLab::rmsBuffer[2000] [private]

Array containg rms mono values for the last numberOfMillisecondsOfRMSBuffer milliseconds.

Ringbuffer. RMSValues with ((currentMSSinceStartOfTrack - timeInMillisecondsSinceStartOfTrack) > numberOfMillisecondsOfRMSBuffer) are discarded.

double* VizKit::VisualAudioLab::rmsMono [private]

The mono rms values.

double VizKit::VisualAudioLab::rmsMonoAvg [private]

The average rms value.

double VizKit::VisualAudioLab::rmsMonoMax [private]

The maximum mono rms value.

Timeframe numberOfMillisecondsOfRMSBuffer.

uint8*** VizKit::VisualAudioLab::spectrumData [private]

The spectrum data array.

The spectrum data array is 3-dimensional with data values, channels and history.

uint8 VizKit::VisualAudioLab::spectrumDCLevel [private]

The spectrum DC level.

0-256 (?). Direct Current of FFT (mono).

float VizKit::VisualAudioLab::spectrumDCLevelSum [private]

The sum of the spectrum DC level.

sum of data (for calc of avg).

uint32 VizKit::VisualAudioLab::startTimeOfTrack [private]

The start time of the currently playing audio track measured in milliseconds.

iTunes allows to set a custom start time for a track.

uint32 VizKit::VisualAudioLab::stopTimeOfTrack [private]

The stop time of the currently playing audio track measured in milliseconds.

iTunes allows to set a custom stop time for a track.

double* VizKit::VisualAudioLab::tappingBuffer [private]

A special buffer for beat detection.

const uint16 VisualAudioLab::tappingBufferLength = 4096 [static, private]

VisualAudioLab * VisualAudioLab::theVisualAudioLab = NULL [static, private]

VisualAudioLab is a singleton class.

Pointer to private instance is handled internally.

uint32 VizKit::VisualAudioLab::totalTimeOfTrack [private]

The total time of the currently playing audio track measured in milliseconds.

sint8*** VizKit::VisualAudioLab::waveformData [private]

The waveform data array.

The waveform data array is 3-dimensional with data values, channels and history.

sint16** VizKit::VisualAudioLab::waveformDataMono [private]

The mono waveform data array.

The mono waveform data array is 2-dimensional with data values, and history.

uint32* VizKit::VisualAudioLab::waveformValSum [private]

The sum of the absolute waveform data values that are higher or lower than 128.

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

vizkit/source/AudioLab/VisualAudioLab.h
vizkit/source/AudioLab/VisualAudioLab.cpp

Classes

Public Member Functions

Static Public Member Functions

Private Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation