classpvideodevice.html

pwlib开发文档

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<a name="a19" doxytag="PVideoDevice::GetFrameSizeLimits"></a><p>
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          <td class="md" nowrap valign="top"> virtual BOOL PVideoDevice::GetFrameSizeLimits </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">unsigned &amp;&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>minWidth</em>, </td>
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          <td class="md" nowrap>unsigned &amp;&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>minHeight</em>, </td>
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          <td></td>
          <td class="md" nowrap>unsigned &amp;&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>maxWidth</em>, </td>
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          <td class="md" nowrap>unsigned &amp;&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>maxHeight</em></td>
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          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [virtual]</code></td>
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Get the minimum &amp; maximum size of a frame on the device.
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Default behaviour returns the value 1 to UINT_MAX for both and returns FALSE. <dl compact><dt><b>Parameters: </b></dt><dd>
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<tr><td valign=top><em>minHeight</em>&nbsp;</td><td>
Variable to receive minimum width </td></tr>
<tr><td valign=top><em>maxWidth</em>&nbsp;</td><td>
Variable to receive minimum height </td></tr>
<tr><td valign=top><em>maxHeight</em>&nbsp;</td><td>
Variable to receive maximum width Variable to receive maximum height </td></tr>
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<p>
Reimplemented in <a class="el" href="classPVideoInput1394DcDevice.html#a22">PVideoInput1394DcDevice</a>.    </td>
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<a name="a23" doxytag="PVideoDevice::GetFrameWidth"></a><p>
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          <td class="md" nowrap valign="top"> virtual unsigned PVideoDevice::GetFrameWidth </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [virtual]</code></td>
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Get the width of the frame being used.
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Default behaviour returns the value of the frameWidth variable     </td>
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<a name="a36" doxytag="PVideoDevice::GetHue"></a><p>
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          <td class="md" nowrap valign="top"> virtual int PVideoDevice::GetHue </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [virtual]</code></td>
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<p>
Get the hue of the image. 0xffff-High hue. -1 is unknown. 
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Reimplemented in <a class="el" href="classPVideoInput1394DcDevice.html#a19">PVideoInput1394DcDevice</a>.    </td>
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<a name="a26" doxytag="PVideoDevice::GetLastError"></a><p>
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          <td class="md" nowrap valign="top"> int PVideoDevice::GetLastError </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap> const<code> [inline]</code></td>
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Get the last error code. This is a platform dependent number.     </td>
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<a name="a25" doxytag="PVideoDevice::GetMaxFrameBytes"></a><p>
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          <td class="md" nowrap valign="top"> virtual PINDEX PVideoDevice::GetMaxFrameBytes </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [pure virtual]</code></td>
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<p>
Get the maximum frame size in bytes.
<p>
Note a particular device may be able to provide variable length frames (eg motion JPEG) so will be the maximum size of all frames. 
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Implemented in <a class="el" href="classPVideoInputDevice.html#a5">PVideoInputDevice</a>, and <a class="el" href="classPVideoInput1394DcDevice.html#a8">PVideoInput1394DcDevice</a>.    </td>
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<a name="a11" doxytag="PVideoDevice::GetNumChannels"></a><p>
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          <td class="md" nowrap valign="top"> virtual int PVideoDevice::GetNumChannels </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [virtual]</code></td>
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<p>
Get the number of video channels available on the device.
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Default behaviour returns 1. 
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Reimplemented in <a class="el" href="classPVideoInput1394DcDevice.html#a24">PVideoInput1394DcDevice</a>.    </td>
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<a name="a38" doxytag="PVideoDevice::GetParameters"></a><p>
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          <td class="md" nowrap valign="top"> virtual BOOL PVideoDevice::GetParameters </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">int *&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>whiteness</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>int *&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>brightness</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>int *&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>colour</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>int *&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>contrast</em>, </td>
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          <td></td>
          <td></td>
          <td class="md" nowrap>int *&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>hue</em></td>
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          <td class="md">)&nbsp;</td>
          <td class="md" colspan="2"><code> [virtual]</code></td>
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<p>
Return whiteness, brightness, colour, contrast and hue in one call. 
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Reimplemented in <a class="el" href="classPVideoInput1394DcDevice.html#a21">PVideoInput1394DcDevice</a>.    </td>
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<a name="a43" doxytag="PVideoDevice::GetPreferredColourFormat"></a><p>
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          <td class="md" nowrap valign="top"> const <a class="el" href="classPString.html">PString</a>&amp; PVideoDevice::GetPreferredColourFormat </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [inline]</code></td>
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<p>
Get preferred native colour format from video capture device. Returns empty == no preference     </td>
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<a name="a40" doxytag="PVideoDevice::GetVFlipState"></a><p>
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          <td class="md" nowrap valign="top"> virtual BOOL PVideoDevice::GetVFlipState </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>&nbsp;          </td>
          <td class="md" valign="top">)&nbsp;</td>
          <td class="md" nowrap><code> [virtual]</code></td>
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Get the video conversion vertical flip state. Default action is to return FALSE.     </td>
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<a name="a10" doxytag="PVideoDevice::GetVideoFormat"></a><p>
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