QAudioDevice 类提供音频设备及其功能的有关信息。 更多...
| 头： |
#include <QAudioDevice>
|
| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Multimedia)
target_link_libraries(mytarget PRIVATE Qt6::Multimedia)
|
| qmake: |
QT += multimedia
|
| enum | 模式 { Null, Input, Output } |
| QAudioDevice () | |
| QAudioDevice (const QAudioDevice & other ) | |
| QAudioDevice (QAudioDevice && other ) | |
| ~QAudioDevice () | |
| QAudioFormat::ChannelConfig | channelConfiguration () const |
| QString | description () const |
| QByteArray | id () const |
| bool | isDefault () const |
| bool | isFormatSupported (const QAudioFormat & settings ) const |
| bool | isNull () const |
| int | maximumChannelCount () const |
| int | maximumSampleRate () const |
| int | minimumChannelCount () const |
| int | minimumSampleRate () const |
| QAudioDevice::Mode | mode () const |
| QAudioFormat | preferredFormat () const |
| QList<QAudioFormat::SampleFormat> | supportedSampleFormats () const |
| void | swap (QAudioDevice & other ) |
| bool | operator!= (const QAudioDevice & other ) const |
| QAudioDevice & | operator= (QAudioDevice && other ) |
| QAudioDevice & | operator= (const QAudioDevice & other ) |
| bool | operator== (const QAudioDevice & other ) const |
QAudioDevice describes an audio device available in the system, either for input or for playback.
A QAudioDevice is used by Qt to construct classes that communicate with the device – such as QAudioSource ，和 QAudioSink . It is also used to determine the input or output device to use in a capture session or during media playback.
The QAudioDevice instance retains its properties throughout its lifetime, even if the corresponding physical device is disconnected or its settings are modified. To keep track of updated properties, the user should load new instances of QAudioDevice from QMediaDevices when the relevant signals are fired.
You can also query each device for the formats it supports. A format in this context is a set consisting of a channel count, sample rate, and sample type. A format is represented by the QAudioFormat 类。
The values supported by the device for each of these parameters can be fetched with minimumChannelCount (), maximumChannelCount (), minimumSampleRate (), maximumSampleRate () 和 supportedSampleFormats (). The combinations supported are dependent on the audio device capabilities. If you need a specific format, you can check if the device supports it with isFormatSupported (). For instance:
{
sourceFile.setFileName("/tmp/test.raw");
sourceFile.open(QIODevice::ReadOnly);
QAudioFormat format;
// Set up the format, eg.
format.setSampleRate(44100);
format.setChannelCount(1);
format.setSampleFormat(QAudioFormat::Int16);
QAudioDevice info(QMediaDevices::defaultAudioOutput());
if (!info.isFormatSupported(format)) {
qWarning() << "Raw audio format not supported by backend, cannot play audio.";
return;
}
audio = new QAudioSink(format, this);
connect(audio, QAudioSink::stateChanged, this, &AudioInputExample::handleStateChanged);
audio->start(&sourceFile);
}
The set of available devices can be retrieved from the QMediaDevices 类。
例如：
const auto devices = QMediaDevices::audioOutputs(); for (const QAudioDevice &device : devices) qDebug() << "Device: " << device.description();
In this code sample, we loop through all devices that are able to output sound, i.e., play an audio stream in a supported format. For each device we find, we simply print the deviceName().
另请参阅 QAudioSink , QAudioSource ，和 QAudioFormat .
Describes the mode of this device.
| 常量 | 值 | 描述 |
|---|---|---|
QAudioDevice::Null
|
0
|
A null device. |
QAudioDevice::Input
|
1
|
An input device. |
QAudioDevice::Output
|
2
|
An output device. |
[read-only]
description
: const
QString
Returns a human readable name of the audio device.
Use this string to present the device to the user.
访问函数：
| QString | description () const |
[read-only]
id
: const
QByteArray
Returns an identifier for the audio device.
设备名称从属所使用的平台/音频插件。
They are a unique identifier for the audio device.
访问函数：
| QByteArray | id () const |
[read-only]
isDefault
: const
bool
Returns true if this is the default audio device.
访问函数：
| bool | isDefault () const |
[read-only]
mode
: const
模式
Returns whether this device is an input or output device.
访问函数：
| QAudioDevice::Mode | mode () const |
Constructs a null QAudioDevice object.
构造副本为 other .
[noexcept]
QAudioDevice::
QAudioDevice
(
QAudioDevice
&&
other
)
Move constructs from other .
[noexcept]
QAudioDevice::
~QAudioDevice
()
销毁此音频设备信息。
Returns the channel configuration of the device.
返回 true 若供给 settings are supported by the audio device described by this QAudioDevice .
Returns whether this QAudioDevice object holds a valid device definition.
Returns the maximum number of supported channel counts.
This is typically 1 for mono sound, or 2 for stereo sound.
Returns the maximum supported sample rate (in Hertz).
Returns the minimum number of supported channel counts.
This is typically 1 for mono sound, or 2 for stereo sound.
Returns the minimum supported sample rate (in Hertz).
Returns the default audio format settings for this device.
These settings are provided by the platform/audio plugin being used.
They are also dependent on the QtAudio ::Mode being used.
A typical audio system would provide something like:
Returns a list of supported sample types.
[noexcept]
void
QAudioDevice::
swap
(
QAudioDevice
&
other
)
Swaps the audio device with the other .
返回 true，若此 QAudioDevice class represents a different audio device than other
[noexcept]
QAudioDevice
&QAudioDevice::
operator=
(
QAudioDevice
&&
other
)
移动 other 到此 QAudioDevice 对象。
设置 QAudioDevice 对象等于 other .
返回 true，若此 QAudioDevice class represents the same audio device as other .