Qt
Internal/Contributor docs for the Qt SDK. Note: These are NOT official API docs; those are found at https://doc.qt.io/
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QAudioHelperInternal Namespace Reference

Classes

class  CatmullRomInterpolator

Enumerations

enum class  NativeSampleFormat : uint8_t {
  uint8_t , int16_t , int32_t , int24_t_3b ,
  int24_t_4b_low , float32_t
}
enum class  UpmixScaling { Duplicate , EqualPower }
enum class  DownmixScaling { Average , KeepPower }

Functions

void qMultiplySamples (float factor, const QAudioFormat &formatformat, const void *srcsrc, void *dest, int lenlen) noexcept Q_DECL_NONBLOCKING_FUNCTION
void applyVolume (float volume, const QAudioFormat &formatformat, QSpan< const std::byte > sourcesource, QSpan< std::byte > destination) noexcept Q_DECL_NONBLOCKING_FUNCTION
void convertSampleFormat (QSpan< const std::byte > sourcesource, NativeSampleFormat sourceFormat, QSpan< std::byte > destination, NativeSampleFormat destinationFormat) noexcept Q_DECL_NONBLOCKING_FUNCTION
NativeSampleFormat bestNativeSampleFormat (const QAudioFormat &fmt, QSpan< const NativeSampleFormat > supportedNativeFormats)
NativeSampleFormat toNativeSampleFormat (QAudioFormat::SampleFormat fmt)
QAudioFormat::SampleFormat bestSampleFormat (const NativeSampleFormat fmt)
std::optional< float > sanitizeVolume (float volume, float lastValue)
void fillSilence (QSpan< std::byte > bufferbuffer, NativeSampleFormat sampleFormat) noexcept Q_DECL_NONBLOCKING_FUNCTION
void fillSilence (QSpan< std::byte > bufferbuffer, QAudioFormat fmt) noexcept Q_DECL_NONBLOCKING_FUNCTION
QByteArray resampleAudioCatmullRom (QSpan< const float > inputinput, int nChannels, int inputRate, int outputRate)
void upmixMonoToStereo (QSpan< float > out, QSpan< const float > inin, UpmixScaling scaling) noexcept Q_DECL_NONBLOCKING_FUNCTION
QByteArray upmixMonoToStereo (QSpan< const float > inputinput, UpmixScaling scaling)
void downmixStereoToMono (QSpan< float > out, QSpan< const float > inin, DownmixScaling scaling) noexcept Q_DECL_NONBLOCKING_FUNCTION
QByteArray downmixStereoToMono (QSpan< const float > inputinput, DownmixScaling scaling)
constexpr size_t bytesPerSample (NativeSampleFormat fmt) noexcept Q_DECL_NONBLOCKING_FUNCTION

Enumeration Type Documentation

◆ DownmixScaling

enum class QAudioHelperInternal::DownmixScaling
strong
Enumerator
Average 
KeepPower 

Definition at line 141 of file qaudiohelpers_p.h.

◆ NativeSampleFormat

enum class QAudioHelperInternal::NativeSampleFormat : uint8_t
strong
Enumerator
uint8_t 
int16_t 
int32_t 
int24_t_3b 
int24_t_4b_low 
float32_t 

Definition at line 40 of file qaudiohelpers_p.h.

◆ UpmixScaling

enum class QAudioHelperInternal::UpmixScaling
strong
Enumerator
Duplicate 
EqualPower 

Definition at line 129 of file qaudiohelpers_p.h.

Function Documentation

◆ applyVolume()

void QAudioHelperInternal::applyVolume ( float volume,
const QAudioFormat & format,
QSpan< const std::byte > source,
QSpan< std::byte > destination )
noexcept

Definition at line 84 of file qaudiohelpers.cpp.

◆ bestNativeSampleFormat()

NativeSampleFormat QAudioHelperInternal::bestNativeSampleFormat ( const QAudioFormat & fmt,
QSpan< const NativeSampleFormat > supportedNativeFormats )

Definition at line 342 of file qaudiohelpers.cpp.

◆ bestSampleFormat()

QAudioFormat::SampleFormat QAudioHelperInternal::bestSampleFormat ( const NativeSampleFormat fmt)

Definition at line 427 of file qaudiohelpers.cpp.

◆ bytesPerSample()

size_t QAudioHelperInternal::bytesPerSample ( NativeSampleFormat fmt)
constexprnoexcept

Definition at line 63 of file qaudiohelpers_p.h.

◆ convertSampleFormat()

void QAudioHelperInternal::convertSampleFormat ( QSpan< const std::byte > source,
NativeSampleFormat sourceFormat,
QSpan< std::byte > destination,
NativeSampleFormat destinationFormat )
noexcept

Definition at line 307 of file qaudiohelpers.cpp.

◆ downmixStereoToMono() [1/2]

QByteArray QAudioHelperInternal::downmixStereoToMono ( QSpan< const float > input,
DownmixScaling scaling = DownmixScaling::Average )

Definition at line 780 of file qaudiohelpers.cpp.

◆ downmixStereoToMono() [2/2]

void QAudioHelperInternal::downmixStereoToMono ( QSpan< float > out,
QSpan< const float > in,
DownmixScaling scaling = DownmixScaling::Average )
noexcept

Definition at line 765 of file qaudiohelpers.cpp.

◆ fillSilence() [1/2]

void QAudioHelperInternal::fillSilence ( QSpan< std::byte > buffer,
NativeSampleFormat sampleFormat )
noexcept

Definition at line 463 of file qaudiohelpers.cpp.

◆ fillSilence() [2/2]

void QAudioHelperInternal::fillSilence ( QSpan< std::byte > buffer,
QAudioFormat fmt )
noexcept

Definition at line 471 of file qaudiohelpers.cpp.

◆ qMultiplySamples()

void QAudioHelperInternal::qMultiplySamples ( float factor,
const QAudioFormat & format,
const void * src,
void * dest,
int len )
noexcept

Definition at line 57 of file qaudiohelpers.cpp.

◆ resampleAudioCatmullRom()

QByteArray QAudioHelperInternal::resampleAudioCatmullRom ( QSpan< const float > input,
int nChannels,
int inputRate,
int outputRate )

Definition at line 504 of file qaudiohelpers.cpp.

◆ sanitizeVolume()

std::optional< float > QAudioHelperInternal::sanitizeVolume ( float volume,
float lastValue )

Definition at line 445 of file qaudiohelpers.cpp.

◆ toNativeSampleFormat()

NativeSampleFormat QAudioHelperInternal::toNativeSampleFormat ( QAudioFormat::SampleFormat fmt)

Definition at line 411 of file qaudiohelpers.cpp.

◆ upmixMonoToStereo() [1/2]

QByteArray QAudioHelperInternal::upmixMonoToStereo ( QSpan< const float > input,
UpmixScaling scaling = UpmixScaling::Duplicate )

Definition at line 749 of file qaudiohelpers.cpp.

◆ upmixMonoToStereo() [2/2]

void QAudioHelperInternal::upmixMonoToStereo ( QSpan< float > out,
QSpan< const float > in,
UpmixScaling scaling = UpmixScaling::Duplicate )
noexcept

Definition at line 733 of file qaudiohelpers.cpp.