Linux窗口移动api_Linux内核编程「建议收藏」

Devices

下文来自linux内核文档，仅供参考。

Video4Linux provides the following sets of device files. These live on the character device formerly known as “/dev/bttv”. /dev/bttv should be a symlink to /dev/video0 for most people.

Video4Linux programs open and scan the devices to find what they are looking for. Capability queries define what each interface supports. The described API is only defined for video capture cards. The relevant subset applies to radio cards. Teletext interfaces talk the existing VTX API.

Capability Query Ioctl

The VIDIOCGCAP ioctl call is used to obtain the capability information for a video device. The struct video_capability object passed to the ioctl is completed and returned. It contains the following information

The type field lists the capability flags for the device. These are as follows

The minimum and maximum sizes listed for a capture device do not imply all that all height/width ratios or sizes within the range are possible. A request to set a size will be honoured by the largest available capture size whose capture is no large than the requested rectangle in either direction. For example the quickcam has 3 fixed settings.

Frame Buffer

Capture cards that drop data directly onto the frame buffer must be told the base address of the frame buffer, its size and organisation. This is a privileged ioctl and one that eventually X itself should set.

The VIDIOCSFBUF ioctl sets the frame buffer parameters for a capture card. If the card does not do direct writes to the frame buffer then this ioctl will be unsupported. The VIDIOCGFBUF ioctl returns the currently used parameters. The structure used in both cases is a struct video_buffer.

Note that these values reflect the physical layout of the frame buffer. The visible area may be smaller. In fact under XFree86 this is commonly the case. XFree86 DGA can provide the parameters required to set up this ioctl. Setting the base address to NULL indicates there is no physical frame buffer access.

Capture Windows

The capture area is described by a struct video_window. This defines a capture area and the clipping information if relevant. The VIDIOCGWIN ioctl recovers the current settings and the VIDIOCSWIN sets new values. A successful call to VIDIOCSWIN indicates that a suitable set of parameters have been chosen. They do not indicate that exactly what was requested was granted. The program should call VIDIOCGWIN to check if the nearest match was suitable. The struct video_window contains the following fields.

Clipping rectangles are passed as an array. Each clip consists of the following fields available to the user.

Merely setting the window does not enable capturing. Overlay capturing (i.e. PCI-PCI transfer to the frame buffer of the video card) is activated by passing the VIDIOCCAPTURE ioctl a value of 1, and disabled by passing it a value of 0.

Some capture devices can capture a subfield of the image they actually see. This is indicated when VIDEO_TYPE_SUBCAPTURE is defined. The video_capture describes the time and special subfields to capture. The video_capture structure contains the following fields.

The available flags are

Video Sources

Each video4linux video or audio device captures from one or more source channels. Each channel can be queries with the VDIOCGCHAN ioctl call. Before invoking this function the caller must set the channel field to the channel that is being queried. On return the struct video_channel is filled in with information about the nature of the channel itself.

The VIDIOCSCHAN ioctl takes an integer argument and switches the capture to this input. It is not defined whether parameters such as colour settings or tuning are maintained across a channel switch. The caller should maintain settings as desired for each channel. (This is reasonable as different video inputs may have different properties).

The struct video_channel consists of the following

The flags defined are

The types defined are

Image Properties

The image properties of the picture can be queried with the VIDIOCGPICT ioctl which fills in a struct video_picture. The VIDIOCSPICT ioctl allows values to be changed. All values except for the palette type are scaled between 0-65535.

The struct video_picture consists of the following fields

The following palettes are defined

Tuning

Each video input channel can have one or more tuners associated with it. Many devices will not have tuners. TV cards and radio cards will have one or more tuners attached.

Tuners are described by a struct video_tuner which can be obtained by the VIDIOCGTUNER ioctl. Fill in the tuner number in the structure then pass the structure to the ioctl to have the data filled in. The tuner can be switched using VIDIOCSTUNER which takes an integer argument giving the tuner to use. A struct tuner has the following fields

The following flags exist

The following modes are defined

Tuning frequencies are an unsigned 32bit value in 1/16th MHz or if the VIDEO_TUNER_LOW flag is set they are in 1/16th KHz. The current frequency is obtained as an unsigned long via the VIDIOCGFREQ ioctl and set by the VIDIOCSFREQ ioctl.

Audio

TV and Radio devices have one or more audio inputs that may be selected. The audio properties are queried by passing a struct video_audio to VIDIOCGAUDIO ioctl. The VIDIOCSAUDIO ioctl sets audio properties.

The structure contains the following fields

The following flags are defined

The following decoding modes are defined

Reading Images

Each call to the read syscall returns the next available image from the device. It is up to the caller to set format and size (using the VIDIOCSPICT and VIDIOCSWIN ioctls) and then to pass a suitable size buffer and length to the function. Not all devices will support read operations.

A second way to handle image capture is via the mmap interface if supported. To use the mmap interface a user first sets the desired image size and depth properties. Next the VIDIOCGMBUF ioctl is issued. This reports the size of buffer to mmap and the offset within the buffer for each frame. The number of frames supported is device dependent and may only be one.

The video_mbuf structure contains the following fields

Once the mmap has been made the VIDIOCMCAPTURE ioctl starts the capture to a frame using the format and image size specified in the video_mmap (which should match or be below the initial query size). When the VIDIOCMCAPTURE ioctl returns the frame is not captured yet, the driver just instructed the hardware to start the capture. The application has to use the VIDIOCSYNC ioctl to wait until the capture of a frame is finished. VIDIOCSYNC takes the frame number you want to wait for as argument.

It is allowed to call VIDIOCMCAPTURE multiple times (with different frame numbers in video_mmap->frame of course) and thus have multiple outstanding capture requests. A simple way do to double-buffering using this feature looks like this:

/* setup everything */
VIDIOCMCAPTURE(0)
while (whatever) {
   VIDIOCMCAPTURE(1)
   VIDIOCSYNC(0)
   /* process frame 0 while the hardware captures frame 1 */
   VIDIOCMCAPTURE(0)
   VIDIOCSYNC(1)
   /* process frame 1 while the hardware captures frame 0 */
}

Note that you are not limited to only two frames. The API allows up to 32 frames, the VIDIOCGMBUF ioctl returns the number of frames the driver granted. Thus it is possible to build deeper queues to avoid loosing frames on load peaks.

While capturing to memory the driver will make a “best effort” attempt to capture to screen as well if requested. This normally means all frames that “miss” memory mapped capture will go to the display.

A final ioctl exists to allow a device to obtain related devices if a driver has multiple components (for example video0 may not be associated with vbi0 which would cause an intercast display program to make a bad mistake). The VIDIOCGUNIT ioctl reports the unit numbers of the associated devices if any exist. The video_unit structure has the following fields.

RDS Datastreams

For radio devices that support it, it is possible to receive Radio Data System (RDS) data by means of a read() on the device. The data is packed in groups of three, as follows:

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