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| >Video for Linux Two API Specification: Revision 0.24</TH |
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| ><H1 |
| CLASS="TITLE" |
| >I. Function Reference</H1 |
| ><DIV |
| CLASS="TOC" |
| ><DL |
| ><DT |
| ><B |
| >Table of Contents</B |
| ></DT |
| ><DT |
| ><A |
| HREF="r7626.htm" |
| >V4L2 close()</A |
| > -- Close a V4L2 device</DT |
| ><DT |
| ><A |
| HREF="r7667.htm" |
| >V4L2 ioctl()</A |
| > -- Program a V4L2 device</DT |
| ><DT |
| ><A |
| HREF="r7771.htm" |
| >ioctl VIDIOC_CROPCAP</A |
| > -- Information about the video cropping and scaling abilities</DT |
| ><DT |
| ><A |
| HREF="r7900.htm" |
| >ioctl VIDIOC_DBG_G_REGISTER, VIDIOC_DBG_S_REGISTER</A |
| > -- Read or write hardware registers</DT |
| ><DT |
| ><A |
| HREF="r8087.htm" |
| >ioctl VIDIOC_ENCODER_CMD, VIDIOC_TRY_ENCODER_CMD</A |
| > -- Execute an encoder command</DT |
| ><DT |
| ><A |
| HREF="r8242.htm" |
| >ioctl VIDIOC_ENUMAUDIO</A |
| > -- Enumerate audio inputs</DT |
| ><DT |
| ><A |
| HREF="r8304.htm" |
| >ioctl VIDIOC_ENUMAUDOUT</A |
| > -- Enumerate audio outputs</DT |
| ><DT |
| ><A |
| HREF="r8367.htm" |
| >ioctl VIDIOC_ENUM_FMT</A |
| > -- Enumerate image formats</DT |
| ><DT |
| ><A |
| HREF="r8494.htm" |
| >ioctl VIDIOC_ENUM_FRAMESIZES</A |
| > -- Enumerate frame sizes</DT |
| ><DT |
| ><A |
| HREF="r8724.htm" |
| >ioctl VIDIOC_ENUM_FRAMEINTERVALS</A |
| > -- Enumerate frame intervals</DT |
| ><DT |
| ><A |
| HREF="r8936.htm" |
| >ioctl VIDIOC_ENUMINPUT</A |
| > -- Enumerate video inputs</DT |
| ><DT |
| ><A |
| HREF="r9149.htm" |
| >ioctl VIDIOC_ENUMOUTPUT</A |
| > -- Enumerate video outputs</DT |
| ><DT |
| ><A |
| HREF="r9288.htm" |
| >ioctl VIDIOC_ENUMSTD</A |
| > -- Enumerate supported video standards</DT |
| ><DT |
| ><A |
| HREF="r9539.htm" |
| >ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO</A |
| > -- Query or select the current audio input and its |
| attributes</DT |
| ><DT |
| ><A |
| HREF="r9688.htm" |
| >ioctl VIDIOC_G_AUDOUT, VIDIOC_S_AUDOUT</A |
| > -- Query or select the current audio output</DT |
| ><DT |
| ><A |
| HREF="r9804.htm" |
| >ioctl VIDIOC_G_CHIP_IDENT</A |
| > -- Identify the chips on a TV card</DT |
| ><DT |
| ><A |
| HREF="r9994.htm" |
| >ioctl VIDIOC_G_CROP, VIDIOC_S_CROP</A |
| > -- Get or set the current cropping rectangle</DT |
| ><DT |
| ><A |
| HREF="r10104.htm" |
| >ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL</A |
| > -- Get or set the value of a control</DT |
| ><DT |
| ><A |
| HREF="r10211.htm" |
| >ioctl VIDIOC_G_ENC_INDEX</A |
| > -- Get meta data about a compressed video stream</DT |
| ><DT |
| ><A |
| HREF="r10386.htm" |
| >ioctl VIDIOC_G_EXT_CTRLS, VIDIOC_S_EXT_CTRLS, |
| VIDIOC_TRY_EXT_CTRLS</A |
| > -- Get or set the value of several controls, try control |
| values</DT |
| ><DT |
| ><A |
| HREF="r10595.htm" |
| >ioctl VIDIOC_G_FBUF, VIDIOC_S_FBUF</A |
| > -- Get or set frame buffer overlay parameters</DT |
| ><DT |
| ><A |
| HREF="r10944.htm" |
| >ioctl VIDIOC_G_FMT, VIDIOC_S_FMT, |
| VIDIOC_TRY_FMT</A |
| > -- Get or set the data format, try a format</DT |
| ><DT |
| ><A |
| HREF="r11094.htm" |
| >ioctl VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY</A |
| > -- Get or set tuner or modulator radio |
| frequency</DT |
| ><DT |
| ><A |
| HREF="r11217.htm" |
| >ioctl VIDIOC_G_INPUT, VIDIOC_S_INPUT</A |
| > -- Query or select the current video input</DT |
| ><DT |
| ><A |
| HREF="r11285.htm" |
| >ioctl VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP</A |
| > -- </DT |
| ><DT |
| ><A |
| HREF="r11430.htm" |
| >ioctl VIDIOC_G_MODULATOR, VIDIOC_S_MODULATOR</A |
| > -- Get or set modulator attributes</DT |
| ><DT |
| ><A |
| HREF="r11612.htm" |
| >ioctl VIDIOC_G_OUTPUT, VIDIOC_S_OUTPUT</A |
| > -- Query or select the current video output</DT |
| ><DT |
| ><A |
| HREF="r11680.htm" |
| >ioctl VIDIOC_G_PARM, VIDIOC_S_PARM</A |
| > -- Get or set streaming parameters</DT |
| ><DT |
| ><A |
| HREF="r11946.htm" |
| >ioctl VIDIOC_G_PRIORITY, VIDIOC_S_PRIORITY</A |
| > -- Query or request the access priority associated with a |
| file descriptor</DT |
| ><DT |
| ><A |
| HREF="r12051.htm" |
| >ioctl VIDIOC_G_SLICED_VBI_CAP</A |
| > -- Query sliced VBI capabilities</DT |
| ><DT |
| ><A |
| HREF="r12265.htm" |
| >ioctl VIDIOC_G_STD, VIDIOC_S_STD</A |
| > -- Query or select the video standard of the current input</DT |
| ><DT |
| ><A |
| HREF="r12342.htm" |
| >ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER</A |
| > -- Get or set tuner attributes</DT |
| ><DT |
| ><A |
| HREF="r12784.htm" |
| >ioctl VIDIOC_LOG_STATUS</A |
| > -- Log driver status information</DT |
| ><DT |
| ><A |
| HREF="r12816.htm" |
| >ioctl VIDIOC_OVERLAY</A |
| > -- Start or stop video overlay</DT |
| ><DT |
| ><A |
| HREF="r12878.htm" |
| >ioctl VIDIOC_QBUF, VIDIOC_DQBUF</A |
| > -- Exchange a buffer with the driver</DT |
| ><DT |
| ><A |
| HREF="r13022.htm" |
| >ioctl VIDIOC_QUERYBUF</A |
| > -- Query the status of a buffer</DT |
| ><DT |
| ><A |
| HREF="r13105.htm" |
| >ioctl VIDIOC_QUERYCAP</A |
| > -- Query device capabilities</DT |
| ><DT |
| ><A |
| HREF="r13317.htm" |
| >ioctl VIDIOC_QUERYCTRL, VIDIOC_QUERYMENU</A |
| > -- Enumerate controls and menu control items</DT |
| ><DT |
| ><A |
| HREF="r13641.htm" |
| >ioctl VIDIOC_QUERYSTD</A |
| > -- Sense the video standard received by the current |
| input</DT |
| ><DT |
| ><A |
| HREF="r13696.htm" |
| >ioctl VIDIOC_REQBUFS</A |
| > -- Initiate Memory Mapping or User Pointer I/O</DT |
| ><DT |
| ><A |
| HREF="r13817.htm" |
| >ioctl VIDIOC_STREAMON, VIDIOC_STREAMOFF</A |
| > -- Start or stop streaming I/O</DT |
| ><DT |
| ><A |
| HREF="r13889.htm" |
| >V4L2 mmap()</A |
| > -- Map device memory into application address space</DT |
| ><DT |
| ><A |
| HREF="r14037.htm" |
| >V4L2 munmap()</A |
| > -- Unmap device memory</DT |
| ><DT |
| ><A |
| HREF="r14090.htm" |
| >V4L2 open()</A |
| > -- Open a V4L2 device</DT |
| ><DT |
| ><A |
| HREF="r14169.htm" |
| >V4L2 poll()</A |
| > -- Wait for some event on a file descriptor</DT |
| ><DT |
| ><A |
| HREF="r14264.htm" |
| >V4L2 read()</A |
| > -- Read from a V4L2 device</DT |
| ><DT |
| ><A |
| HREF="r14390.htm" |
| >V4L2 select()</A |
| > -- Synchronous I/O multiplexing</DT |
| ><DT |
| ><A |
| HREF="r14496.htm" |
| >V4L2 write()</A |
| > -- Write to a V4L2 device</DT |
| ></DL |
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