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<a href="display_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2014 Vittorio Giovara <vittorio.giovara@gmail.com></span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * This file is part of FFmpeg.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * FFmpeg is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * License as published by the Free Software Foundation; either</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * FFmpeg is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * License along with FFmpeg; if not, write to the Free Software</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#ifndef AVUTIL_DISPLAY_H</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor"></span><span class="preprocessor">#define AVUTIL_DISPLAY_H</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <stdint.h></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"></span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * The display transformation matrix specifies an affine transformation that</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * should be applied to video frames for correct presentation. It is compatible</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * with the matrices stored in the ISO/IEC 14496-12 container format.</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * The data is a 3x3 matrix represented as a 9-element array:</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * | a b u |</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * (a, b, u, c, d, v, x, y, w) -> | c d v |</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * | x y w |</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * All numbers are stored in native endianness, as 16.16 fixed-point values,</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * except for u, v and w, which are stored as 2.30 fixed-point values.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * The transformation maps a point (p, q) in the source (pre-transformation)</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * frame to the point (p', q') in the destination (post-transformation) frame as</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * follows:</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> * | a b u |</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * (p, q, 1) . | c d v | = z * (p', q', 1)</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> * | x y w |</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"> * The transformation can also be more explicitly written in components as</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment"> * follows:</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * p' = (a * p + c * q + x) / z;</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * q' = (b * p + d * q + y) / z;</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> * z = u * p + v * q + w</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"></span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment"> * Extract the rotation component of the transformation matrix.</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * @param matrix the transformation matrix</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * @return the angle (in degrees) by which the transformation rotates the frame</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * counterclockwise. The angle will be in range [-180.0, 180.0],</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * or NaN if the matrix is singular.</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * @note floating point numbers are inherently inexact, so callers are</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * recommended to round the return value to nearest integer before use.</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="keywordtype">double</span> <a class="code" href="display_8h.html#aac2ea94d3f66496c758349450b5b0217">av_display_rotation_get</a>(<span class="keyword">const</span> int32_t matrix[9]);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"></span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> * Initialize a transformation matrix describing a pure counterclockwise</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * rotation by the specified angle (in degrees).</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * @param matrix an allocated transformation matrix (will be fully overwritten</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * by this function)</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> * @param angle rotation angle in degrees.</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="keywordtype">void</span> <a class="code" href="display_8h.html#a5964303bfe085ad33683bc2454768d4a">av_display_rotation_set</a>(int32_t matrix[9], <span class="keywordtype">double</span> angle);</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"></span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * Flip the input matrix horizontally and/or vertically.</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * @param matrix an allocated transformation matrix</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * @param hflip whether the matrix should be flipped horizontally</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * @param vflip whether the matrix should be flipped vertically</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="keywordtype">void</span> <a class="code" href="display_8h.html#add236b7ced34637aa9f0a9bceaeac5c3">av_display_matrix_flip</a>(int32_t matrix[9], <span class="keywordtype">int</span> hflip, <span class="keywordtype">int</span> vflip);</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="preprocessor">#endif </span><span class="comment">/* AVUTIL_DISPLAY_H */</span><span class="preprocessor"></span></div>
<div class="ttc" id="display_8h_html_a5964303bfe085ad33683bc2454768d4a"><div class="ttname"><a href="display_8h.html#a5964303bfe085ad33683bc2454768d4a">av_display_rotation_set</a></div><div class="ttdeci">void av_display_rotation_set(int32_t matrix[9], double angle)</div><div class="ttdoc">Initialize a transformation matrix describing a pure counterclockwise rotation by the specified angle...</div></div>
<div class="ttc" id="display_8h_html_aac2ea94d3f66496c758349450b5b0217"><div class="ttname"><a href="display_8h.html#aac2ea94d3f66496c758349450b5b0217">av_display_rotation_get</a></div><div class="ttdeci">double av_display_rotation_get(const int32_t matrix[9])</div><div class="ttdoc">The display transformation matrix specifies an affine transformation that should be applied to video ...</div></div>
<div class="ttc" id="display_8h_html_add236b7ced34637aa9f0a9bceaeac5c3"><div class="ttname"><a href="display_8h.html#add236b7ced34637aa9f0a9bceaeac5c3">av_display_matrix_flip</a></div><div class="ttdeci">void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip)</div><div class="ttdoc">Flip the input matrix horizontally and/or vertically. </div></div>
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