cAudioProcessor Class Reference

Audio Manipulation. More...

#include <audioprocessor.h>

Public Member Functions
	cAudioProcessor (const int)
	Create a new audio processoror.
void	Normalize (uint16_t *, int)
	Normalize audio samples.
void	SetNormalizer (int)
	Set normalize volume parameters.
void	ResetNormalizer (void)
void	Compress (uint16_t *, int)
	Compress audio samples.
void	SetCompressor (int)
	Set volume compression parameters.
void	ResetCompressor (void)
void	SetEqualizer (int[18])
	Set equalizer bands.
std::string	GetEqualizerOptions (void) const
	Get equalizer filter options.
void	Amplify (int16_t *, int, int)
	Amplify the samples in software.
void	SetAmplifier (int volume)

Private Attributes
const int	m_bytesPerSample
int	m_normalizeCounter
	normalize sample counter
uint32_t	m_normalizeAverage [NORMALIZE_MAX_INDEX]
	average of n last normalize sample blocks
int	m_normalizeIndex
	index into normalize average table
int	m_normalizeReady
	index normalize counter
int	m_normalizeFactor
	current normalize factor
int	m_normalizeMaxFactor
	max. normalize factor
int	m_compressionFactor = 0
	current compression factor
int	m_compressionMaxFactor
	max. compression factor
float	m_equalizerBand [18]
	equalizer band
int	m_amplifier
	software volume amplify factor

Static Private Attributes
static constexpr int	NORMALIZE_MAX_INDEX = 128
	number of normalize average samples
static constexpr int	NORMALIZE_SAMPLES = 4096
	number of normalize samples
static constexpr int	NORMALIZE_DEFAULT_FACTOR = 1000
	default normalize factor
static constexpr int	NORMALIZE_MIN_FACTOR = 100
	min. normalize factor
static constexpr int	COMPRESSION_DEFAULT_FACTOR = 1000
	default compression factor
static constexpr int	COMPRESSION_DEFAULT_MAX_FACTOR = 2000
	default compression max. factor

Detailed Description

Audio Manipulation.

Definition at line 24 of file audioprocessor.h.

Constructor & Destructor Documentation

cAudioProcessor()

cAudioProcessor::cAudioProcessor

(

const int

bytesPerSample

)

Create a new audio processoror.

Parameters

bytesPerSample

bytes per sampler (hardcoded to 2)

Definition at line 31 of file audioprocessor.cpp.

Member Function Documentation

Amplify()

void cAudioProcessor::Amplify	(	int16_t *	samples,
		int	count,
		int	volume
	)

Amplify the samples in software.

Parameters

samples	sample buffer
count	number of bytes in sample buffer

Todo:

FIXME: this does hard clipping

Definition at line 286 of file audioprocessor.cpp.

References m_amplifier, and m_bytesPerSample.

Referenced by cSoftHdAudio::SendAudio().

Compress()

void cAudioProcessor::Compress	(	uint16_t *	samples,
		int	count
	)

Compress audio samples.

Parameters

samples	sample buffer
count	number of bytes in sample buffer

Definition at line 144 of file audioprocessor.cpp.

References L_SOUND, LOGDEBUG2, m_bytesPerSample, m_compressionFactor, and m_compressionMaxFactor.

Referenced by cSoftHdAudio::EnqueueFrame().

GetEqualizerOptions()

std::string cAudioProcessor::GetEqualizerOptions

(

void

)

const

Get equalizer filter options.

Definition at line 257 of file audioprocessor.cpp.

References m_equalizerBand.

Referenced by cSoftHdAudio::InitFilter().

Normalize()

void cAudioProcessor::Normalize	(	uint16_t *	samples,
		int	count
	)

Normalize audio samples.

Parameters

samples	sample buffer
count	number of bytes in sample buffer

Definition at line 42 of file audioprocessor.cpp.

References L_SOUND, LOGDEBUG2, m_bytesPerSample, m_normalizeAverage, m_normalizeCounter, m_normalizeFactor, m_normalizeIndex, m_normalizeMaxFactor, m_normalizeReady, NORMALIZE_MAX_INDEX, NORMALIZE_MIN_FACTOR, and NORMALIZE_SAMPLES.

Referenced by cSoftHdAudio::EnqueueFrame().

ResetCompressor()

void cAudioProcessor::ResetCompressor

(

void

)

Definition at line 209 of file audioprocessor.cpp.

References COMPRESSION_DEFAULT_MAX_FACTOR, m_compressionFactor, and m_compressionMaxFactor.

Referenced by cSoftHdAudio::DropAlsaBuffers(), and cSoftHdAudio::FlushAlsaBuffers().

ResetNormalizer()

void cAudioProcessor::ResetNormalizer

(

void

)

Definition at line 127 of file audioprocessor.cpp.

References m_normalizeAverage, m_normalizeCounter, m_normalizeFactor, m_normalizeReady, NORMALIZE_DEFAULT_FACTOR, and NORMALIZE_MAX_INDEX.

Referenced by cSoftHdAudio::DropAlsaBuffers(), and cSoftHdAudio::FlushAlsaBuffers().

SetAmplifier()

void cAudioProcessor::SetAmplifier ( int  volume )

inline

Definition at line 40 of file audioprocessor.h.

References m_amplifier.

Referenced by cSoftHdAudio::SetVolume().

SetCompressor()

void cAudioProcessor::SetCompressor

(

int

maxfac

)

Set volume compression parameters.

Parameters

maxfac

max. factor of compression / 1000

Definition at line 198 of file audioprocessor.cpp.

References COMPRESSION_DEFAULT_FACTOR, m_compressionFactor, and m_compressionMaxFactor.

Referenced by cSoftHdAudio::SetCompression().

SetEqualizer()

void cAudioProcessor::SetEqualizer

(

int

band[18]

)

Set equalizer bands.

Parameters

band	setting frequenz bands

Definition at line 222 of file audioprocessor.cpp.

References m_equalizerBand.

Referenced by cSoftHdAudio::SetEqualizer().

SetNormalizer()

void cAudioProcessor::SetNormalizer

(

int

maxfac

)

Set normalize volume parameters.

Parameters

maxfac

max. factor of normalize / 1000

Definition at line 122 of file audioprocessor.cpp.

References m_normalizeMaxFactor.

Referenced by cSoftHdAudio::SetNormalize().

Member Data Documentation

COMPRESSION_DEFAULT_FACTOR

constexpr int cAudioProcessor::COMPRESSION_DEFAULT_FACTOR = 1000

staticconstexprprivate

default compression factor

Definition at line 58 of file audioprocessor.h.

Referenced by SetCompressor().

COMPRESSION_DEFAULT_MAX_FACTOR

constexpr int cAudioProcessor::COMPRESSION_DEFAULT_MAX_FACTOR = 2000

staticconstexprprivate

default compression max. factor

Definition at line 59 of file audioprocessor.h.

Referenced by ResetCompressor().

m_amplifier

int cAudioProcessor::m_amplifier

private

software volume amplify factor

Definition at line 67 of file audioprocessor.h.

Referenced by Amplify(), and SetAmplifier().

m_bytesPerSample

const int cAudioProcessor::m_bytesPerSample

private

Definition at line 43 of file audioprocessor.h.

Referenced by Amplify(), Compress(), and Normalize().

m_compressionFactor

int cAudioProcessor::m_compressionFactor = 0

private

current compression factor

Definition at line 60 of file audioprocessor.h.

Referenced by Compress(), ResetCompressor(), and SetCompressor().

m_compressionMaxFactor

int cAudioProcessor::m_compressionMaxFactor

private

max. compression factor

Definition at line 61 of file audioprocessor.h.

Referenced by Compress(), ResetCompressor(), and SetCompressor().

m_equalizerBand

float cAudioProcessor::m_equalizerBand[18]

private

equalizer band

Definition at line 64 of file audioprocessor.h.

Referenced by GetEqualizerOptions(), and SetEqualizer().

m_normalizeAverage

uint32_t cAudioProcessor::m_normalizeAverage[NORMALIZE_MAX_INDEX]

private

average of n last normalize sample blocks

Definition at line 51 of file audioprocessor.h.

Referenced by Normalize(), and ResetNormalizer().

m_normalizeCounter

int cAudioProcessor::m_normalizeCounter

private

normalize sample counter

Definition at line 50 of file audioprocessor.h.

Referenced by Normalize(), and ResetNormalizer().

m_normalizeFactor

int cAudioProcessor::m_normalizeFactor

private

current normalize factor

Definition at line 54 of file audioprocessor.h.

Referenced by Normalize(), and ResetNormalizer().

m_normalizeIndex

int cAudioProcessor::m_normalizeIndex

private

index into normalize average table

Definition at line 52 of file audioprocessor.h.

Referenced by Normalize().

m_normalizeMaxFactor

int cAudioProcessor::m_normalizeMaxFactor

private

max. normalize factor

Definition at line 55 of file audioprocessor.h.

Referenced by Normalize(), and SetNormalizer().

m_normalizeReady

int cAudioProcessor::m_normalizeReady

private

index normalize counter

Definition at line 53 of file audioprocessor.h.

Referenced by Normalize(), and ResetNormalizer().

NORMALIZE_DEFAULT_FACTOR

constexpr int cAudioProcessor::NORMALIZE_DEFAULT_FACTOR = 1000

staticconstexprprivate

default normalize factor

Definition at line 48 of file audioprocessor.h.

Referenced by ResetNormalizer().

NORMALIZE_MAX_INDEX

constexpr int cAudioProcessor::NORMALIZE_MAX_INDEX = 128

staticconstexprprivate

number of normalize average samples

Definition at line 46 of file audioprocessor.h.

Referenced by Normalize(), and ResetNormalizer().

NORMALIZE_MIN_FACTOR

constexpr int cAudioProcessor::NORMALIZE_MIN_FACTOR = 100

staticconstexprprivate

min. normalize factor

Definition at line 49 of file audioprocessor.h.

Referenced by Normalize().

NORMALIZE_SAMPLES

constexpr int cAudioProcessor::NORMALIZE_SAMPLES = 4096

staticconstexprprivate

number of normalize samples

Definition at line 47 of file audioprocessor.h.

Referenced by Normalize().

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

• audioprocessor.h
• audioprocessor.cpp