The QAudioFormat class stores audio stream parameter information. 更多...
| 头： | #include <QAudioFormat> |
| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Multimedia)
target_link_libraries(mytarget PRIVATE Qt6::Multimedia) |
| qmake: | QT += multimedia |
| enum | AudioChannelPosition { UnknownPosition, FrontLeft, FrontRight, FrontCenter, LFE, …, BottomFrontRight } |
| enum | ChannelConfig { ChannelConfigUnknown, ChannelConfigMono, ChannelConfigStereo, ChannelConfig2Dot1, ChannelConfig3Dot0, …, ChannelConfigSurround7Dot1 } |
| enum | SampleFormat { Unknown, UInt8, Int16, Int32, Float } |
| QAudioFormat () | |
| QAudioFormat (const QAudioFormat & other ) | |
| ~QAudioFormat () | |
| qint32 | bytesForDuration (qint64 microseconds ) const |
| qint32 | bytesForFrames (qint32 frameCount ) const |
| int | bytesPerFrame () const |
| int | bytesPerSample () const |
| QAudioFormat::ChannelConfig | channelConfig () const |
| int | channelCount () const |
| int | channelOffset (QAudioFormat::AudioChannelPosition channel ) const |
| qint64 | durationForBytes (qint32 bytes ) const |
| qint64 | durationForFrames (qint32 frameCount ) const |
| qint32 | framesForBytes (qint32 byteCount ) const |
| qint32 | framesForDuration (qint64 microseconds ) const |
| bool | isValid () const |
| float | normalizedSampleValue (const void * sample ) const |
| QAudioFormat::SampleFormat | sampleFormat () const |
| int | sampleRate () const |
| void | setChannelConfig (QAudioFormat::ChannelConfig config ) |
| void | setChannelCount (int channels ) |
| void | setSampleFormat (QAudioFormat::SampleFormat format ) |
| void | setSampleRate (int samplerate ) |
| QAudioFormat::ChannelConfig | channelConfig (Args... channels ) |
| QAudioFormat::ChannelConfig | defaultChannelConfigForChannelCount (int channelCount ) |
| bool | operator!= (const QAudioFormat & a , const QAudioFormat & b ) |
| bool | operator== (const QAudioFormat & a , const QAudioFormat & b ) |
An audio format specifies how data in a raw audio stream is arranged. For example, how the stream is to be interpreted.
QAudioFormat contains parameters that specify how the audio sample data is arranged. These are the frequency, the number of channels, and the sample format. The following table describes these in more detail.
| 参数 | 描述 |
|---|---|
| 采样率 | Samples per second of audio data in Hertz. |
| 通道数 | The number of audio channels (typically one for mono or two for stereo). These are the amount of consecutive samples that together form one frame in the stream |
| Sample format | The format of the audio samples in the stream |
This class is used in conjunction with QAudioSource or QAudioSink to allow you to specify the parameters of the audio stream being read or written, or with QAudioBuffer when dealing with samples in memory.
You can obtain audio formats compatible with the audio device used through functions in QAudioDevice . This class also lets you query available parameter values for a device, so that you can set the parameters yourself. See the QAudioDevice class description for details. You need to know the format of the audio streams you wish to play or record.
Samples for all channels will be interleaved. One sample for each channel for the same instant in time is referred to as a frame in Qt Multimedia (and other places).
Describes the possible audio channel positions. These follow the standard definition used in the 22.2 surround sound configuration.
| 常量 | 值 | 描述 |
|---|---|---|
QAudioFormat::UnknownPosition
|
0
|
Unknown position |
QAudioFormat::FrontLeft
|
1
|
|
QAudioFormat::FrontRight
|
2
|
|
QAudioFormat::FrontCenter
|
3
|
|
QAudioFormat::LFE
|
4
|
Low Frequency Effect channel (Subwoofer) |
QAudioFormat::BackLeft
|
5
|
|
QAudioFormat::BackRight
|
6
|
|
QAudioFormat::FrontLeftOfCenter
|
7
|
|
QAudioFormat::FrontRightOfCenter
|
8
|
|
QAudioFormat::BackCenter
|
9
|
|
QAudioFormat::LFE2
|
19
|
|
QAudioFormat::SideLeft
|
10
|
|
QAudioFormat::SideRight
|
11
|
|
QAudioFormat::TopFrontLeft
|
13
|
|
QAudioFormat::TopFrontRight
|
15
|
|
QAudioFormat::TopFrontCenter
|
14
|
|
QAudioFormat::TopCenter
|
12
|
|
QAudioFormat::TopBackLeft
|
16
|
|
QAudioFormat::TopBackRight
|
18
|
|
QAudioFormat::TopSideLeft
|
20
|
|
QAudioFormat::TopSideRight
|
21
|
|
QAudioFormat::TopBackCenter
|
17
|
|
QAudioFormat::BottomFrontCenter
|
22
|
|
QAudioFormat::BottomFrontLeft
|
23
|
|
QAudioFormat::BottomFrontRight
|
24
|
This enum describes a standardized audio channel layout. The most common configurations are Mono, Stereo, 2.1 (stereo plus low frequency), 5.1 surround, and 7.1 surround configurations.
| 常量 | 值 | 描述 |
|---|---|---|
QAudioFormat::ChannelConfigUnknown
|
0
|
The channel configuration is not known. |
QAudioFormat::ChannelConfigMono
|
QtPrivate::channelConfig(FrontCenter)
|
The audio has one Center channel. |
QAudioFormat::ChannelConfigStereo
|
QtPrivate::channelConfig(FrontLeft, FrontRight)
|
The audio has two channels, Left and Right. |
QAudioFormat::ChannelConfig2Dot1
|
QtPrivate::channelConfig(FrontLeft, FrontRight, LFE)
|
The audio has three channels, Left, Right and LFE (low frequency effect). |
QAudioFormat::ChannelConfig3Dot0
|
QtPrivate::channelConfig(FrontLeft, FrontRight, FrontCenter)
|
The audio has three channels, Left, Right, and Center. |
QAudioFormat::ChannelConfig3Dot1
|
QtPrivate::channelConfig(FrontLeft, FrontRight, FrontCenter, LFE)
|
The audio has four channels, Left, Right, Center, and LFE (low frequency effect). |
QAudioFormat::ChannelConfigSurround5Dot0
|
QtPrivate::channelConfig(FrontLeft, FrontRight, FrontCenter, BackLeft, BackRight)
|
The audio has five channels, Left, Right, Center, BackLeft ，和 BackRight . |
QAudioFormat::ChannelConfigSurround5Dot1
|
QtPrivate::channelConfig(FrontLeft, FrontRight, FrontCenter, LFE, BackLeft, BackRight)
|
The audio has 6 channels, Left, Right, Center, LFE, BackLeft ，和 BackRight . |
QAudioFormat::ChannelConfigSurround7Dot0
|
QtPrivate::channelConfig(FrontLeft, FrontRight, FrontCenter, BackLeft, BackRight, SideLeft, SideRight)
|
The audio has 7 channels, Left, Right, Center, BackLeft , BackRight , SideLeft ，和 SideRight . |
QAudioFormat::ChannelConfigSurround7Dot1
|
QtPrivate::channelConfig(FrontLeft, FrontRight, FrontCenter, LFE, BackLeft, BackRight, SideLeft, SideRight)
|
The audio has 8 channels, Left, Right, Center, LFE, BackLeft , BackRight , SideLeft ，和 SideRight . |
Qt will always expect and use samples in the endianness of the host platform. When processing audio data from external sources yourself, ensure you convert them to the correct endianness before writing them to a QAudioSink or QAudioBuffer .
| 常量 | 值 | 描述 |
|---|---|---|
QAudioFormat::Unknown
|
0
|
不设置 |
QAudioFormat::UInt8
|
1
|
Samples are unsigned 8 bit signed integers |
QAudioFormat::Int16
|
2
|
Samples are 16 bit signed integers |
QAudioFormat::Int32
|
3
|
Samples are 32 bit signed integers |
QAudioFormat::Float
|
4
|
采样是浮点数 |
[default]
QAudioFormat::
QAudioFormat
()
Constructs a new audio format.
值的初始化如下：
[default]
QAudioFormat::
QAudioFormat
(const
QAudioFormat
&
other
)
构造新的音频格式使用 other .
[default]
QAudioFormat::
~QAudioFormat
()
销毁此音频格式。
Returns the number of bytes required for this audio format for microseconds .
返回 0 若此格式无效。
Note that some rounding may occur if microseconds is not an exact fraction of the sampleRate ().
另请参阅 durationForBytes ().
Returns the number of bytes required for frameCount frames of this format.
返回 0 若此格式无效。
另请参阅 bytesForDuration ().
[constexpr]
int
QAudioFormat::
bytesPerFrame
() const
Returns the number of bytes required to represent one frame (a sample in each channel) in this format.
Returns 0 if this format is invalid.
[constexpr]
int
QAudioFormat::
bytesPerSample
() const
Returns the number of bytes required to represent one sample in this format.
Returns 0 if this format is invalid.
[static constexpr]
template <typename Args>
QAudioFormat::ChannelConfig
QAudioFormat::
channelConfig
(
Args
...
channels
)
Returns the current channel configuration for the given channels .
另请参阅 setChannelConfig ().
[constexpr]
QAudioFormat::ChannelConfig
QAudioFormat::
channelConfig
() const
Returns the current channel configuration.
[constexpr]
int
QAudioFormat::
channelCount
() const
返回当前通道计数值。
另请参阅 setChannelCount ().
Returns the position of a certain audio channel inside an audio frame for the given format. Returns -1 if the channel does not exist for this format or the channel configuration is unknown.
[static]
QAudioFormat::ChannelConfig
QAudioFormat::
defaultChannelConfigForChannelCount
(
int
channelCount
)
Returns a default channel configuration for channelCount .
Default configurations are defined for up to 8 channels, and correspond to standard Mono, Stereo and Surround configurations. For higher channel counts, this simply uses the first channelCount audio channels defined in QAudioFormat::AudioChannelPosition .
Returns the number of microseconds represented by bytes in this format.
返回 0 若此格式无效。
Note that some rounding may occur if bytes is not an exact multiple of the number of bytes per frame.
另请参阅 bytesForDuration ().
Return the number of microseconds represented by frameCount frames in this format.
Returns the number of frames represented by byteCount in this format.
Note that some rounding may occur if byteCount is not an exact multiple of the number of bytes per frame.
Each frame has one sample per channel.
另请参阅 framesForDuration ().
Returns the number of frames required to represent microseconds in this format.
Note that some rounding may occur if microseconds is not an exact fraction of the sampleRate ().
[constexpr]
bool
QAudioFormat::
isValid
() const
返回
true
if all of the parameters are valid.
Normalizes the sample value to a number between -1 and 1. The method depends on the QaudioFormat.
[constexpr]
QAudioFormat::SampleFormat
QAudioFormat::
sampleFormat
() const
Returns the current sample format.
另请参阅 setSampleFormat ().
[constexpr]
int
QAudioFormat::
sampleRate
() const
返回当前采样率 (以赫兹为单位)。
另请参阅 setSampleRate ().
Sets the channel configuration to config .
Sets the channel configuration of the audio format to one of the standard audio channel configurations.
注意： that this will also modify the channel count.
另请参阅 channelConfig ().
[constexpr]
void
QAudioFormat::
setChannelCount
(
int
channels
)
将通道计数设为 channels . Setting this also sets the channel config to ChannelConfigUnknown .
另请参阅 channelCount ().
[constexpr]
void
QAudioFormat::
setSampleFormat
(
QAudioFormat::SampleFormat
format
)
Sets the sample format to format .
另请参阅 sampleFormat () 和 QAudioFormat::SampleFormat .
[constexpr]
void
QAudioFormat::
setSampleRate
(
int
samplerate
)
Sets the sample rate to samplerate in Hertz.
另请参阅 sampleRate ().
返回
true
if audio format
a
不等于
b
，否则返回
false
.
返回
true
if audio format
a
等于
b
，否则返回
false
.