Why Gemfury?
Push, build, and install
RubyGems
npm packages
Python packages
Maven artifacts
PHP packages
Go Modules
Debian packages
RPM packages
NuGet packages
showbox-public / ffmpeg-doc deb
Repository URL to install this package:
|
Version:
7:2.7.1-1ubuntu3 ▾
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<title>FFmpeg: libavutil/display.h File Reference</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
$(document).ready(function() { searchBox.OnSelectItem(0); });
</script>
</head>
<body>
<div id="top"><!-- do not remove this div! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td style="padding-left: 0.5em;">
<div id="projectname">FFmpeg
 <span id="projectnumber">2.7.1</span>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- Generated by Doxygen 1.7.6.1 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main Page</span></a></li>
<li><a href="pages.html"><span>Related Pages</span></a></li>
<li><a href="modules.html"><span>Modules</span></a></li>
<li><a href="annotated.html"><span>Data Structures</span></a></li>
<li class="current"><a href="files.html"><span>Files</span></a></li>
<li><a href="examples.html"><span>Examples</span></a></li>
<li>
<div id="MSearchBox" class="MSearchBoxInactive">
<span class="left">
<img id="MSearchSelect" src="search/mag_sel.png"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
alt=""/>
<input type="text" id="MSearchField" value="Search" accesskey="S"
onfocus="searchBox.OnSearchFieldFocus(true)"
onblur="searchBox.OnSearchFieldFocus(false)"
onkeyup="searchBox.OnSearchFieldChange(event)"/>
</span><span class="right">
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
</span>
</div>
</li>
</ul>
</div>
<div id="navrow2" class="tabs2">
<ul class="tablist">
<li><a href="files.html"><span>File List</span></a></li>
<li><a href="globals.html"><span>Globals</span></a></li>
</ul>
</div>
</div>
<div class="header">
<div class="summary">
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">libavutil/display.h File Reference</div> </div>
</div><!--header-->
<div class="contents">
<div class="textblock"><code>#include <stdint.h></code><br/>
</div>
<p><a href="display_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="display_8h.html#aac2ea94d3f66496c758349450b5b0217">av_display_rotation_get</a> (const int32_t matrix[9])</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The display transformation matrix specifies an affine transformation that should be applied to video frames for correct presentation. <a href="#aac2ea94d3f66496c758349450b5b0217"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="display_8h.html#a5964303bfe085ad33683bc2454768d4a">av_display_rotation_set</a> (int32_t matrix[9], double angle)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Initialize a transformation matrix describing a pure counterclockwise rotation by the specified angle (in degrees). <a href="#a5964303bfe085ad33683bc2454768d4a"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="display_8h.html#add236b7ced34637aa9f0a9bceaeac5c3">av_display_matrix_flip</a> (int32_t matrix[9], int hflip, int vflip)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Flip the input matrix horizontally and/or vertically. <a href="#add236b7ced34637aa9f0a9bceaeac5c3"></a><br/></td></tr>
</table>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="aac2ea94d3f66496c758349450b5b0217"></a><!-- doxytag: member="display.h::av_display_rotation_get" ref="aac2ea94d3f66496c758349450b5b0217" args="(const int32_t matrix[9])" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">double <a class="el" href="display_8h.html#aac2ea94d3f66496c758349450b5b0217">av_display_rotation_get</a> </td>
<td>(</td>
<td class="paramtype">const int32_t </td>
<td class="paramname"><em>matrix</em>[9]</td><td>)</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>The display transformation matrix specifies an affine transformation that should be applied to video frames for correct presentation. </p>
<p>It is compatible with the matrices stored in the ISO/IEC 14496-12 container format.</p>
<p>The data is a 3x3 matrix represented as a 9-element array:</p>
<p>| a b u | (a, b, u, c, d, v, x, y, w) -> | c d v | | x y w |</p>
<p>All numbers are stored in native endianness, as 16.16 fixed-point values, except for u, v and w, which are stored as 2.30 fixed-point values.</p>
<p>The transformation maps a point (p, q) in the source (pre-transformation) frame to the point (p', q') in the destination (post-transformation) frame as follows: | a b u | (p, q, 1) . | c d v | = z * (p', q', 1) | x y w |</p>
<p>The transformation can also be more explicitly written in components as follows: p' = (a * p + c * q + x) / z; q' = (b * p + d * q + y) / z; z = u * p + v * q + w Extract the rotation component of the transformation matrix.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">matrix</td><td>the transformation matrix </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the angle (in degrees) by which the transformation rotates the frame counterclockwise. The angle will be in range [-180.0, 180.0], or NaN if the matrix is singular.</dd></dl>
<dl class="note"><dt><b>Note:</b></dt><dd>floating point numbers are inherently inexact, so callers are recommended to round the return value to nearest integer before use. </dd></dl>
</div>
</div>
<a class="anchor" id="a5964303bfe085ad33683bc2454768d4a"></a><!-- doxytag: member="display.h::av_display_rotation_set" ref="a5964303bfe085ad33683bc2454768d4a" args="(int32_t matrix[9], double angle)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="display_8h.html#a5964303bfe085ad33683bc2454768d4a">av_display_rotation_set</a> </td>
<td>(</td>
<td class="paramtype">int32_t </td>
<td class="paramname"><em>matrix</em>[9], </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"><em>angle</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Initialize a transformation matrix describing a pure counterclockwise rotation by the specified angle (in degrees). </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">matrix</td><td>an allocated transformation matrix (will be fully overwritten by this function) </td></tr>
<tr><td class="paramname">angle</td><td>rotation angle in degrees. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="add236b7ced34637aa9f0a9bceaeac5c3"></a><!-- doxytag: member="display.h::av_display_matrix_flip" ref="add236b7ced34637aa9f0a9bceaeac5c3" args="(int32_t matrix[9], int hflip, int vflip)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void <a class="el" href="display_8h.html#add236b7ced34637aa9f0a9bceaeac5c3">av_display_matrix_flip</a> </td>
<td>(</td>
<td class="paramtype">int32_t </td>
<td class="paramname"><em>matrix</em>[9], </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>hflip</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>vflip</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Flip the input matrix horizontally and/or vertically. </p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">matrix</td><td>an allocated transformation matrix </td></tr>
<tr><td class="paramname">hflip</td><td>whether the matrix should be flipped horizontally </td></tr>
<tr><td class="paramname">vflip</td><td>whether the matrix should be flipped vertically </td></tr>
</table>
</dd>
</dl>
</div>
</div>
</div><!-- contents -->
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Defines</a></div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0"
name="MSearchResults" id="MSearchResults">
</iframe>
</div>
<hr class="footer"/><address class="footer"><small>
Generated by  <a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.7.6.1
</small></address>
</body>
</html>