QAudioBuffer 类表示具有特定格式和采样率的一批音频样本。 更多...
| 头： | #include <QAudioBuffer> |
| CMake: |
find_package(Qt6 COMPONENTS Multimedia REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Multimedia) |
| qmake: | QT += multimedia |
| S16S |
| QAudioBuffer (QAudioBuffer && other ) | |
| QAudioBuffer (int numFrames , const QAudioFormat & format , qint64 startTime = -1) | |
| QAudioBuffer (const QByteArray & data , const QAudioFormat & format , qint64 startTime = -1) | |
| QAudioBuffer (const QAudioBuffer & other ) | |
| QAudioBuffer () | |
| QAudioBuffer & | operator= (QAudioBuffer && other ) |
| QAudioBuffer & | operator= (const QAudioBuffer & other ) |
| ~QAudioBuffer () | |
| qsizetype | byteCount () const |
| const T * | constData () const |
| const T * | data () const |
| T * | data () |
| void | detach () |
| qint64 | duration () const |
| QAudioFormat | format () const |
| qsizetype | frameCount () const |
| bool | isValid () const |
| qsizetype | sampleCount () const |
| qint64 | startTime () const |
QAudioBuffer is used by the QAudioDecoder class to hand decoded audio data over to the application. An audio buffer contains data in a certain QAudioFormat that can be queried using format (). It is also tagged with timing and duration information.
To access the data stored inside the buffer, use the data () 或 constData () 方法。
Audio buffers are explicitly shared, in most cases, you should call detach () before modifying the data.
This is a predefined specialization for a signed stereo 16 bit sample. Each channel is a signed short .
Constructs a QAudioBuffer by moving from other .
Creates a new audio buffer with space for numFrames frames of the given format . The individual samples will be initialized to the default for the format.
startTime (in microseconds) indicates when this buffer starts in the stream. If this buffer is not part of a stream, set it to -1.
Creates a new audio buffer from the supplied data ，在给定 format . The format will determine how the number and sizes of the samples are interpreted from the data .
If the supplied data is not an integer multiple of the calculated frame size, the excess data will not be used.
This audio buffer will copy the contents of data .
startTime (in microseconds) indicates when this buffer starts in the stream. If this buffer is not part of a stream, set it to -1.
Creates a new audio buffer from other . Audio buffers are explicitly shared, you should call detach () on the buffer to make a copy that can then be modified.
创建新的、空无效缓冲。
移动 other 到此 QAudioBuffer .
赋值 other buffer to this.
销毁此音频缓冲。
Returns the size of this buffer, in bytes.
Returns a pointer to this buffer's data. You can only read it.
This method is preferred over the const version of data () to prevent unnecessary copying.
There is also a templatized version of this constData() function that allows you to retrieve a specific type of read-only pointer to the data. Note that there is no checking done on the format of the audio buffer - this is simply a convenience function.
// With a 16bit sample buffer: const quint16 *data = buffer->constData<quint16>();
Returns a pointer to this buffer's data. You can only read it.
You should use the constData () function rather than this to prevent accidental deep copying.
There is also a templatized version of this data() function that allows you to retrieve a specific type of read-only pointer to the data. Note that there is no checking done on the format of the audio buffer - this is simply a convenience function.
// With a 16bit sample const buffer: const quint16 *data = buffer->data<quint16>();
Returns a pointer to this buffer's data. You can modify the data through the returned pointer.
由于 QAudioBuffer objects are explicitly shared, you should usually call detach () before modifying the data through this function.
There is also a templatized version of data() allows you to retrieve a specific type of pointer to the data. Note that there is no checking done on the format of the audio buffer - this is simply a convenience function.
// With a 16bit sample buffer: quint16 *data = buffer->data<quint16>(); // May cause deep copy
Detaches this audio buffers from other copies that might share data with it.
Returns the duration of audio in this buffer, in microseconds.
This depends on the format (), and the frameCount ().
返回 format of this buffer.
Several properties of this format influence how the duration () 或 byteCount () are calculated from the frameCount ().
Returns the number of complete audio frames in this buffer.
An audio frame is an interleaved set of one sample per channel for the same instant in time.
Returns true if this is a valid buffer. A valid buffer has more than zero frames in it and a valid format.
Returns the number of samples in this buffer.
If the format of this buffer has multiple channels, then this count includes all channels. This means that a stereo buffer with 1000 samples in total will have 500 left samples and 500 right samples (interleaved), and this function will return 1000.
另请参阅 frameCount ().
Returns the time in a stream that this buffer starts at (in microseconds).
If this buffer is not part of a stream, this will return -1.
