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     40 >Video for Linux Two API Specification: Revision 0.24</TH
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     71 ><DIV
     72 CLASS="SECTION"
     73 ><H1
     74 CLASS="SECTION"
     75 ><A
     76 NAME="EXPERIMENTAL"
     77 >6.4. Experimental API Elements</A
     78 ></H1
     79 ><P
     80 >The following V4L2 API elements are currently experimental
     81 and may change in the future.</P
     82 ><P
     83 ></P
     84 ><UL
     85 ><LI
     86 ><P
     87 >Video Output Overlay (OSD) Interface, <A
     88 HREF="x6909.htm"
     89 >Section 4.4</A
     90 >.</P
     91 ></LI
     92 ><LI
     93 ><P
     94 ><CODE
     95 CLASS="CONSTANT"
     96 >V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY</CODE
     97 >,
     98         enum&nbsp;<A
     99 HREF="x5953.htm#V4L2-BUF-TYPE"
    100 >v4l2_buf_type</A
    101 >, <A
    102 HREF="x5953.htm#V4L2-BUF-TYPE"
    103 >Table 3-2</A
    104 >.</P
    105 ></LI
    106 ><LI
    107 ><P
    108 ><CODE
    109 CLASS="CONSTANT"
    110 >V4L2_CAP_VIDEO_OUTPUT_OVERLAY</CODE
    111 >,
    112 <A
    113 HREF="r13105.htm"
    114 ><CODE
    115 CLASS="CONSTANT"
    116 >VIDIOC_QUERYCAP</CODE
    117 ></A
    118 > ioctl, <A
    119 HREF="r13105.htm#DEVICE-CAPABILITIES"
    120 >Table 2</A
    121 >.</P
    122 ></LI
    123 ><LI
    124 ><P
    125 ><A
    126 HREF="r8494.htm"
    127 ><CODE
    128 CLASS="CONSTANT"
    129 >VIDIOC_ENUM_FRAMESIZES</CODE
    130 ></A
    131 > and
    132 <A
    133 HREF="r8724.htm"
    134 ><CODE
    135 CLASS="CONSTANT"
    136 >VIDIOC_ENUM_FRAMEINTERVALS</CODE
    137 ></A
    138 > ioctls.</P
    139 ></LI
    140 ><LI
    141 ><P
    142 ><A
    143 HREF="r10211.htm"
    144 ><CODE
    145 CLASS="CONSTANT"
    146 >VIDIOC_G_ENC_INDEX</CODE
    147 ></A
    148 > ioctl.</P
    149 ></LI
    150 ><LI
    151 ><P
    152 ><A
    153 HREF="r8087.htm"
    154 ><CODE
    155 CLASS="CONSTANT"
    156 >VIDIOC_ENCODER_CMD</CODE
    157 ></A
    158 > and <A
    159 HREF="r8087.htm"
    160 ><CODE
    161 CLASS="CONSTANT"
    162 >VIDIOC_TRY_ENCODER_CMD</CODE
    163 ></A
    164 >
    165 ioctls.</P
    166 ></LI
    167 ><LI
    168 ><P
    169 ><A
    170 HREF="r7900.htm"
    171 ><CODE
    172 CLASS="CONSTANT"
    173 >VIDIOC_DBG_G_REGISTER</CODE
    174 ></A
    175 > and <A
    176 HREF="r7900.htm"
    177 ><CODE
    178 CLASS="CONSTANT"
    179 >VIDIOC_DBG_S_REGISTER</CODE
    180 ></A
    181 >
    182 ioctls.</P
    183 ></LI
    184 ><LI
    185 ><P
    186 ><A
    187 HREF="r9804.htm"
    188 ><CODE
    189 CLASS="CONSTANT"
    190 >VIDIOC_G_CHIP_IDENT</CODE
    191 ></A
    192 > ioctl.</P
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