The QVideoFrameFormat class specifies the stream format of a video presentation surface. 更多...
| 头： | #include <QVideoFrameFormat> |
| CMake: |
find_package(Qt6 COMPONENTS Multimedia REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Multimedia) |
| qmake: | QT += multimedia |
| enum | Direction { TopToBottom, BottomToTop } |
| enum | PixelFormat { Format_Invalid, Format_ARGB8888, Format_ARGB8888_Premultiplied, Format_XRGB8888, Format_BGRA8888, …, Format_SamplerRect } |
| enum | YCbCrColorSpace { YCbCr_Undefined, YCbCr_BT601, YCbCr_BT709, YCbCr_xvYCC601, YCbCr_xvYCC709, YCbCr_JPEG } |
| QVideoFrameFormat (QVideoFrameFormat && other ) | |
| QVideoFrameFormat (const QVideoFrameFormat & other ) | |
| QVideoFrameFormat (const QSize & size , QVideoFrameFormat::PixelFormat format ) | |
| QVideoFrameFormat () | |
| QVideoFrameFormat & | operator= (const QVideoFrameFormat & other ) |
| QVideoFrameFormat & | operator= (QVideoFrameFormat && other ) |
| ~QVideoFrameFormat () | |
| int | frameHeight () const |
| qreal | frameRate () const |
| QSize | frameSize () const |
| int | frameWidth () const |
| bool | isMirrored () const |
| bool | isValid () const |
| QVideoFrameFormat::PixelFormat | pixelFormat () const |
| int | planeCount () const |
| QVideoFrameFormat::Direction | scanLineDirection () const |
| void | setFrameRate (qreal rate ) |
| void | setFrameSize (const QSize & size ) |
| void | setFrameSize (int width , int height ) |
| void | setMirrored (bool mirrored ) |
| void | setScanLineDirection (QVideoFrameFormat::Direction direction ) |
| void | setViewport (const QRect & viewport ) |
| void | setYCbCrColorSpace (QVideoFrameFormat::YCbCrColorSpace space ) |
| QRect | viewport () const |
| QVideoFrameFormat::YCbCrColorSpace | yCbCrColorSpace () const |
| bool | operator!= (const QVideoFrameFormat & other ) const |
| bool | operator== (const QVideoFrameFormat & other ) const |
| QImage::Format | imageFormatFromPixelFormat (QVideoFrameFormat::PixelFormat format ) |
| QVideoFrameFormat::PixelFormat | pixelFormatFromImageFormat (QImage::Format format ) |
| QString | pixelFormatToString (QVideoFrameFormat::PixelFormat pixelFormat ) |
A video sink presents a stream of video frames. QVideoFrameFormat describes the type of the frames and determines how they should be presented.
The core properties of a video stream required to setup a video sink are the pixel format given by pixelFormat (), and the frame dimensions given by frameSize ().
The region of a frame that is actually displayed on a video surface is given by the viewport (). A stream may have a viewport less than the entire region of a frame to allow for videos smaller than the nearest optimal size of a video frame. For example the width of a frame may be extended so that the start of each scan line is eight byte aligned.
Other common properties are the scanLineDirection (), frameRate () and the yCrCbColorSpace().
枚举视频扫描线的布局方向。
| 常量 | 值 | 描述 |
|---|---|---|
QVideoFrameFormat::TopToBottom
|
0
|
Scan lines are arranged from the top of the frame to the bottom. |
QVideoFrameFormat::BottomToTop
|
1
|
Scan lines are arranged from the bottom of the frame to the top. |
枚举视频数据类型。
| 常量 | 值 | 描述 |
|---|---|---|
QVideoFrameFormat::Format_Invalid
|
0
|
帧是无效的。 |
QVideoFrameFormat::Format_ARGB8888
|
1
|
The frame is stored using a ARGB format with 8 bits per component. |
QVideoFrameFormat::Format_ARGB8888_Premultiplied
|
2
|
The frame stored using a premultiplied ARGB format with 8 bits per component. |
QVideoFrameFormat::Format_XRGB8888
|
3
|
The frame stored using a 32 bits per pixel RGB format (0xff, R, G, B). |
QVideoFrameFormat::Format_BGRA8888
|
4
|
The frame is stored using a 32-bit BGRA format (0xBBGGRRAA). |
QVideoFrameFormat::Format_BGRA8888_Premultiplied
|
5
|
The frame is stored using a premultiplied 32bit BGRA format. |
QVideoFrameFormat::Format_ABGR8888
|
7
|
The frame is stored using a 32-bit ABGR format (0xAABBGGRR). |
QVideoFrameFormat::Format_XBGR8888
|
8
|
The frame is stored using a 32-bit BGR format (0xffBBGGRR). |
QVideoFrameFormat::Format_RGBA8888
|
9
|
The frame is stored in memory as the bytes R, G, B, A/X, with R at the lowest address and A/X at the highest address. |
QVideoFrameFormat::Format_BGRX8888
|
6
|
The frame is stored in format 32-bit BGRx format, [31:0] B:G:R:x 8:8:8:8 little endian |
QVideoFrameFormat::Format_RGBX8888
|
10
|
The frame is stored in memory as the bytes R, G, B, A/X, with R at the lowest address and A/X at the highest address. |
QVideoFrameFormat::Format_AYUV
|
11
|
The frame is stored using a packed 32-bit AYUV format (0xAAYYUUVV). |
QVideoFrameFormat::Format_AYUV_Premultiplied
|
12
|
The frame is stored using a packed premultiplied 32-bit AYUV format (0xAAYYUUVV). |
QVideoFrameFormat::Format_YUV420P
|
13
|
The frame is stored using an 8-bit per component planar YUV format with the U and V planes horizontally and vertically sub-sampled, i.e. the height and width of the U and V planes are half that of the Y plane. |
QVideoFrameFormat::Format_YUV422P
|
14
|
The frame is stored using an 8-bit per component planar YUV format with the U and V planes horizontally sub-sampled, i.e. the width of the U and V planes are half that of the Y plane, and height of U and V planes is the same as Y. |
QVideoFrameFormat::Format_YV12
|
15
|
The frame is stored using an 8-bit per component planar YVU format with the V and U planes horizontally and vertically sub-sampled, i.e. the height and width of the V and U planes are half that of the Y plane. |
QVideoFrameFormat::Format_UYVY
|
16
|
The frame is stored using an 8-bit per component packed YUV format with the U and V planes horizontally sub-sampled (U-Y-V-Y), i.e. two horizontally adjacent pixels are stored as a 32-bit macropixel which has a Y value for each pixel and common U and V values. |
QVideoFrameFormat::Format_YUYV
|
17
|
The frame is stored using an 8-bit per component packed YUV format with the U and V planes horizontally sub-sampled (Y-U-Y-V), i.e. two horizontally adjacent pixels are stored as a 32-bit macropixel which has a Y value for each pixel and common U and V values. |
QVideoFrameFormat::Format_NV12
|
18
|
The frame is stored using an 8-bit per component semi-planar YUV format with a Y plane (Y) followed by a horizontally and vertically sub-sampled, packed UV plane (U-V). |
QVideoFrameFormat::Format_NV21
|
19
|
The frame is stored using an 8-bit per component semi-planar YUV format with a Y plane (Y) followed by a horizontally and vertically sub-sampled, packed VU plane (V-U). |
QVideoFrameFormat::Format_IMC1
|
20
|
The frame is stored using an 8-bit per component planar YUV format with the U and V planes horizontally and vertically sub-sampled. This is similar to the Format_YUV420P type, except that the bytes per line of the U and V planes are padded out to the same stride as the Y plane. |
QVideoFrameFormat::Format_IMC2
|
21
|
The frame is stored using an 8-bit per component planar YUV format with the U and V planes horizontally and vertically sub-sampled. This is similar to the Format_YUV420P type, except that the lines of the U and V planes are interleaved, i.e. each line of U data is followed by a line of V data creating a single line of the same stride as the Y data. |
QVideoFrameFormat::Format_IMC3
|
22
|
The frame is stored using an 8-bit per component planar YVU format with the V and U planes horizontally and vertically sub-sampled. This is similar to the Format_YV12 type, except that the bytes per line of the V and U planes are padded out to the same stride as the Y plane. |
QVideoFrameFormat::Format_IMC4
|
23
|
The frame is stored using an 8-bit per component planar YVU format with the V and U planes horizontally and vertically sub-sampled. This is similar to the Format_YV12 type, except that the lines of the V and U planes are interleaved, i.e. each line of V data is followed by a line of U data creating a single line of the same stride as the Y data. |
QVideoFrameFormat::Format_P010
|
26
|
The frame is stored using a 16bit per component semi-planar YUV format with a Y plane (Y) followed by a horizontally and vertically sub-sampled, packed UV plane (U-V). Only the 10 most significant bits of each component are being used. |
QVideoFrameFormat::Format_P016
|
27
|
The frame is stored using a 16bit per component semi-planar YUV format with a Y plane (Y) followed by a horizontally and vertically sub-sampled, packed UV plane (U-V). |
QVideoFrameFormat::Format_Y8
|
24
|
The frame is stored using an 8-bit greyscale format. |
QVideoFrameFormat::Format_Y16
|
25
|
The frame is stored using a 16-bit linear greyscale format. Little endian. |
QVideoFrameFormat::Format_Jpeg
|
29
|
The frame is stored in compressed Jpeg format. |
QVideoFrameFormat::Format_SamplerExternalOES
|
28
|
The frame is stored in external OES texture format. |
QVideoFrameFormat::Format_SamplerRect
|
30
|
The frame is stored in rectangle texture format. |
枚举视频帧的 Y'CbCr 色彩空间。
| 常量 | 值 | 描述 |
|---|---|---|
QVideoFrameFormat::YCbCr_Undefined
|
0
|
No color space is specified. |
QVideoFrameFormat::YCbCr_BT601
|
1
|
A Y'CbCr color space defined by ITU-R recommendation BT.601 with Y value range from 16 to 235, and Cb/Cr range from 16 to 240. Used in standard definition video. |
QVideoFrameFormat::YCbCr_BT709
|
2
|
A Y'CbCr color space defined by ITU-R BT.709 with the same values range as YCbCr_BT601. Used for HDTV. |
QVideoFrameFormat::YCbCr_xvYCC601
|
3
|
The BT.601 color space with the value range extended to 0 to 255. It is backward compatible with BT.601 and uses values outside BT.601 range to represent a wider range of colors. |
QVideoFrameFormat::YCbCr_xvYCC709
|
4
|
The BT.709 color space with the value range extended to 0 to 255. |
QVideoFrameFormat::YCbCr_JPEG
|
5
|
The full range Y'CbCr color space used in JPEG files. |
Constructs a QVideoFrameFormat by moving from other .
构造副本为 other .
Constructs a video stream with the given frame size and pixel format .
Constructs a null video stream format.
Assigns the values of other 到此对象。
移动 other 到此 QVideoFrameFormat .
Destroys a video stream description.
Returns the height of frame in a video stream.
Returns the frame rate of a video stream in frames per second.
另请参阅 setFrameRate ().
返回视频流中帧的尺度。
另请参阅 setFrameSize (), frameWidth ()，和 frameHeight ().
返回视频流中帧的宽度。
另请参阅 frameSize () 和 frameHeight ().
[static]
QImage::Format
QVideoFrameFormat::
imageFormatFromPixelFormat
(
QVideoFrameFormat::PixelFormat
format
)
返回图像格式等效视频帧像素 format 。若没有等效格式 QImage::Format_Invalid 被返回取而代之。
注意： 一般而言 QImage 没有 YUV 格式。
返回
true
if the surface is mirrored around its vertical axis. This is typically needed for video frames coming from a front camera of a mobile device.
注意： The mirroring here differs from QImage::mirrored , as a vertically mirrored QImage will be mirrored around its x-axis.
Identifies if a video surface format has a valid pixel format and frame size.
Returns true if the format is valid, and false otherwise.
返回视频流中帧的像素格式。
[static]
QVideoFrameFormat::PixelFormat
QVideoFrameFormat::
pixelFormatFromImageFormat
(
QImage::Format
format
)
Returns a video pixel format equivalent to an image format 。若没有等效格式 QVideoFrameFormat::Format_Invalid 被返回取而代之。
注意： 一般而言 QImage 没有 YUV 格式。
[static]
QString
QVideoFrameFormat::
pixelFormatToString
(
QVideoFrameFormat::PixelFormat
pixelFormat
)
Returns a string representation of the given pixelFormat .
Returns the number of planes used. This number is depending on the pixel format and is 1 for RGB based formats, and a number between 1 and 3 for YUV based formats.
Returns the direction of scan lines.
另请参阅 setScanLineDirection ().
Sets the frame rate of a video stream in frames per second.
另请参阅 frameRate ().
Sets the size of frames in a video stream to size .
This will reset the viewport () to fill the entire frame.
另请参阅 frameSize ().
这是重载函数。
设置 width and height of frames in a video stream.
This will reset the viewport () to fill the entire frame.
Sets if the surface is mirrored around its vertical axis. This is typically needed for video frames coming from a front camera of a mobile device. Default value is false.
注意： The mirroring here differs from QImage::mirrored , as a vertically mirrored QImage will be mirrored around its x-axis.
另请参阅 isMirrored ().
设置 direction of scan lines.
另请参阅 scanLineDirection ().
Sets the viewport of a video stream to viewport .
另请参阅 viewport ().
Sets the Y'CbCr color space of a video stream. It is only used with raw YUV frame types.
另请参阅 yCbCrColorSpace ().
Returns the viewport of a video stream.
The viewport is the region of a video frame that is actually displayed.
By default the viewport covers an entire frame.
另请参阅 setViewport ().
Returns the Y'CbCr color space of a video stream.
另请参阅 setYCbCrColorSpace ().
返回 true 若 other is different to this video format, and false if they are the same.
返回 true 若 other is the same as this video format, and false if they are different.