1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> 2 <HTML 3 ><HEAD 4 ><TITLE 5 >Function Reference</TITLE 6 ><META 7 NAME="GENERATOR" 8 CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK 9 REL="HOME" 10 TITLE="Video for Linux Two API Specification" 11 HREF="book1.htm"><LINK 12 REL="PREVIOUS" 13 TITLE="RDS Interface" 14 HREF="x7607.htm"><LINK 15 REL="NEXT" 16 TITLE="V4L2 close()" 17 HREF="r7626.htm"></HEAD 18 ><BODY 19 CLASS="REFERENCE" 20 BGCOLOR="#FFFFFF" 21 TEXT="#000000" 22 LINK="#0000FF" 23 VLINK="#840084" 24 ALINK="#0000FF" 25 ><DIV 26 CLASS="NAVHEADER" 27 ><TABLE 28 SUMMARY="Header navigation table" 29 WIDTH="100%" 30 BORDER="0" 31 CELLPADDING="0" 32 CELLSPACING="0" 33 ><TR 34 ><TH 35 COLSPAN="3" 36 ALIGN="center" 37 >Video for Linux Two API Specification: Revision 0.24</TH 38 ></TR 39 ><TR 40 ><TD 41 WIDTH="10%" 42 ALIGN="left" 43 VALIGN="bottom" 44 ><A 45 HREF="x7607.htm" 46 ACCESSKEY="P" 47 >Prev</A 48 ></TD 49 ><TD 50 WIDTH="80%" 51 ALIGN="center" 52 VALIGN="bottom" 53 ></TD 54 ><TD 55 WIDTH="10%" 56 ALIGN="right" 57 VALIGN="bottom" 58 ><A 59 HREF="r7626.htm" 60 ACCESSKEY="N" 61 >Next</A 62 ></TD 63 ></TR 64 ></TABLE 65 ><HR 66 ALIGN="LEFT" 67 WIDTH="100%"></DIV 68 ><DIV 69 CLASS="REFERENCE" 70 ><A 71 NAME="USER-FUNC" 72 ></A 73 ><DIV 74 CLASS="TITLEPAGE" 75 ><H1 76 CLASS="TITLE" 77 >I. Function Reference</H1 78 ><DIV 79 CLASS="TOC" 80 ><DL 81 ><DT 82 ><B 83 >Table of Contents</B 84 ></DT 85 ><DT 86 ><A 87 HREF="r7626.htm" 88 >V4L2 close()</A 89 > -- Close a V4L2 device</DT 90 ><DT 91 ><A 92 HREF="r7667.htm" 93 >V4L2 ioctl()</A 94 > -- Program a V4L2 device</DT 95 ><DT 96 ><A 97 HREF="r7771.htm" 98 >ioctl VIDIOC_CROPCAP</A 99 > -- Information about the video cropping and scaling abilities</DT 100 ><DT 101 ><A 102 HREF="r7900.htm" 103 >ioctl VIDIOC_DBG_G_REGISTER, VIDIOC_DBG_S_REGISTER</A 104 > -- Read or write hardware registers</DT 105 ><DT 106 ><A 107 HREF="r8087.htm" 108 >ioctl VIDIOC_ENCODER_CMD, VIDIOC_TRY_ENCODER_CMD</A 109 > -- Execute an encoder command</DT 110 ><DT 111 ><A 112 HREF="r8242.htm" 113 >ioctl VIDIOC_ENUMAUDIO</A 114 > -- Enumerate audio inputs</DT 115 ><DT 116 ><A 117 HREF="r8304.htm" 118 >ioctl VIDIOC_ENUMAUDOUT</A 119 > -- Enumerate audio outputs</DT 120 ><DT 121 ><A 122 HREF="r8367.htm" 123 >ioctl VIDIOC_ENUM_FMT</A 124 > -- Enumerate image formats</DT 125 ><DT 126 ><A 127 HREF="r8494.htm" 128 >ioctl VIDIOC_ENUM_FRAMESIZES</A 129 > -- Enumerate frame sizes</DT 130 ><DT 131 ><A 132 HREF="r8724.htm" 133 >ioctl VIDIOC_ENUM_FRAMEINTERVALS</A 134 > -- Enumerate frame intervals</DT 135 ><DT 136 ><A 137 HREF="r8936.htm" 138 >ioctl VIDIOC_ENUMINPUT</A 139 > -- Enumerate video inputs</DT 140 ><DT 141 ><A 142 HREF="r9149.htm" 143 >ioctl VIDIOC_ENUMOUTPUT</A 144 > -- Enumerate video outputs</DT 145 ><DT 146 ><A 147 HREF="r9288.htm" 148 >ioctl VIDIOC_ENUMSTD</A 149 > -- Enumerate supported video standards</DT 150 ><DT 151 ><A 152 HREF="r9539.htm" 153 >ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO</A 154 > -- Query or select the current audio input and its 155 attributes</DT 156 ><DT 157 ><A 158 HREF="r9688.htm" 159 >ioctl VIDIOC_G_AUDOUT, VIDIOC_S_AUDOUT</A 160 > -- Query or select the current audio output</DT 161 ><DT 162 ><A 163 HREF="r9804.htm" 164 >ioctl VIDIOC_G_CHIP_IDENT</A 165 > -- Identify the chips on a TV card</DT 166 ><DT 167 ><A 168 HREF="r9994.htm" 169 >ioctl VIDIOC_G_CROP, VIDIOC_S_CROP</A 170 > -- Get or set the current cropping rectangle</DT 171 ><DT 172 ><A 173 HREF="r10104.htm" 174 >ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL</A 175 > -- Get or set the value of a control</DT 176 ><DT 177 ><A 178 HREF="r10211.htm" 179 >ioctl VIDIOC_G_ENC_INDEX</A 180 > -- Get meta data about a compressed video stream</DT 181 ><DT 182 ><A 183 HREF="r10386.htm" 184 >ioctl VIDIOC_G_EXT_CTRLS, VIDIOC_S_EXT_CTRLS, 185 VIDIOC_TRY_EXT_CTRLS</A 186 > -- Get or set the value of several controls, try control 187 values</DT 188 ><DT 189 ><A 190 HREF="r10595.htm" 191 >ioctl VIDIOC_G_FBUF, VIDIOC_S_FBUF</A 192 > -- Get or set frame buffer overlay parameters</DT 193 ><DT 194 ><A 195 HREF="r10944.htm" 196 >ioctl VIDIOC_G_FMT, VIDIOC_S_FMT, 197 VIDIOC_TRY_FMT</A 198 > -- Get or set the data format, try a format</DT 199 ><DT 200 ><A 201 HREF="r11094.htm" 202 >ioctl VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY</A 203 > -- Get or set tuner or modulator radio 204 frequency</DT 205 ><DT 206 ><A 207 HREF="r11217.htm" 208 >ioctl VIDIOC_G_INPUT, VIDIOC_S_INPUT</A 209 > -- Query or select the current video input</DT 210 ><DT 211 ><A 212 HREF="r11285.htm" 213 >ioctl VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP</A 214 > -- </DT 215 ><DT 216 ><A 217 HREF="r11430.htm" 218 >ioctl VIDIOC_G_MODULATOR, VIDIOC_S_MODULATOR</A 219 > -- Get or set modulator attributes</DT 220 ><DT 221 ><A 222 HREF="r11612.htm" 223 >ioctl VIDIOC_G_OUTPUT, VIDIOC_S_OUTPUT</A 224 > -- Query or select the current video output</DT 225 ><DT 226 ><A 227 HREF="r11680.htm" 228 >ioctl VIDIOC_G_PARM, VIDIOC_S_PARM</A 229 > -- Get or set streaming parameters</DT 230 ><DT 231 ><A 232 HREF="r11946.htm" 233 >ioctl VIDIOC_G_PRIORITY, VIDIOC_S_PRIORITY</A 234 > -- Query or request the access priority associated with a 235 file descriptor</DT 236 ><DT 237 ><A 238 HREF="r12051.htm" 239 >ioctl VIDIOC_G_SLICED_VBI_CAP</A 240 > -- Query sliced VBI capabilities</DT 241 ><DT 242 ><A 243 HREF="r12265.htm" 244 >ioctl VIDIOC_G_STD, VIDIOC_S_STD</A 245 > -- Query or select the video standard of the current input</DT 246 ><DT 247 ><A 248 HREF="r12342.htm" 249 >ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER</A 250 > -- Get or set tuner attributes</DT 251 ><DT 252 ><A 253 HREF="r12784.htm" 254 >ioctl VIDIOC_LOG_STATUS</A 255 > -- Log driver status information</DT 256 ><DT 257 ><A 258 HREF="r12816.htm" 259 >ioctl VIDIOC_OVERLAY</A 260 > -- Start or stop video overlay</DT 261 ><DT 262 ><A 263 HREF="r12878.htm" 264 >ioctl VIDIOC_QBUF, VIDIOC_DQBUF</A 265 > -- Exchange a buffer with the driver</DT 266 ><DT 267 ><A 268 HREF="r13022.htm" 269 >ioctl VIDIOC_QUERYBUF</A 270 > -- Query the status of a buffer</DT 271 ><DT 272 ><A 273 HREF="r13105.htm" 274 >ioctl VIDIOC_QUERYCAP</A 275 > -- Query device capabilities</DT 276 ><DT 277 ><A 278 HREF="r13317.htm" 279 >ioctl VIDIOC_QUERYCTRL, VIDIOC_QUERYMENU</A 280 > -- Enumerate controls and menu control items</DT 281 ><DT 282 ><A 283 HREF="r13641.htm" 284 >ioctl VIDIOC_QUERYSTD</A 285 > -- Sense the video standard received by the current 286 input</DT 287 ><DT 288 ><A 289 HREF="r13696.htm" 290 >ioctl VIDIOC_REQBUFS</A 291 > -- Initiate Memory Mapping or User Pointer I/O</DT 292 ><DT 293 ><A 294 HREF="r13817.htm" 295 >ioctl VIDIOC_STREAMON, VIDIOC_STREAMOFF</A 296 > -- Start or stop streaming I/O</DT 297 ><DT 298 ><A 299 HREF="r13889.htm" 300 >V4L2 mmap()</A 301 > -- Map device memory into application address space</DT 302 ><DT 303 ><A 304 HREF="r14037.htm" 305 >V4L2 munmap()</A 306 > -- Unmap device memory</DT 307 ><DT 308 ><A 309 HREF="r14090.htm" 310 >V4L2 open()</A 311 > -- Open a V4L2 device</DT 312 ><DT 313 ><A 314 HREF="r14169.htm" 315 >V4L2 poll()</A 316 > -- Wait for some event on a file descriptor</DT 317 ><DT 318 ><A 319 HREF="r14264.htm" 320 >V4L2 read()</A 321 > -- Read from a V4L2 device</DT 322 ><DT 323 ><A 324 HREF="r14390.htm" 325 >V4L2 select()</A 326 > -- Synchronous I/O multiplexing</DT 327 ><DT 328 ><A 329 HREF="r14496.htm" 330 >V4L2 write()</A 331 > -- Write to a V4L2 device</DT 332 ></DL 333 ></DIV 334 ></DIV 335 ></DIV 336 ><DIV 337 CLASS="NAVFOOTER" 338 ><HR 339 ALIGN="LEFT" 340 WIDTH="100%"><TABLE 341 SUMMARY="Footer navigation table" 342 WIDTH="100%" 343 BORDER="0" 344 CELLPADDING="0" 345 CELLSPACING="0" 346 ><TR 347 ><TD 348 WIDTH="33%" 349 ALIGN="left" 350 VALIGN="top" 351 ><A 352 HREF="x7607.htm" 353 ACCESSKEY="P" 354 >Prev</A 355 ></TD 356 ><TD 357 WIDTH="34%" 358 ALIGN="center" 359 VALIGN="top" 360 ><A 361 HREF="book1.htm" 362 ACCESSKEY="H" 363 >Home</A 364 ></TD 365 ><TD 366 WIDTH="33%" 367 ALIGN="right" 368 VALIGN="top" 369 ><A 370 HREF="r7626.htm" 371 ACCESSKEY="N" 372 >Next</A 373 ></TD 374 ></TR 375 ><TR 376 ><TD 377 WIDTH="33%" 378 ALIGN="left" 379 VALIGN="top" 380 >RDS Interface</TD 381 ><TD 382 WIDTH="34%" 383 ALIGN="center" 384 VALIGN="top" 385 > </TD 386 ><TD 387 WIDTH="33%" 388 ALIGN="right" 389 VALIGN="top" 390 >V4L2 close()</TD 391 ></TR 392 ></TABLE 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