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showbox-public-14
showbox-public-14 / ffmpeg-doc deb
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<div class="title">scaling_video.c</div> </div>
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<a href="scaling__video_8c.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) 2012 Stefano Sabatini</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"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * of this software and associated documentation files (the "Software"), to deal</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * in the Software without restriction, including without limitation the rights</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * furnished to do so, subject to the following conditions:</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"> * The above copyright notice and this permission notice shall be included in</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * THE SOFTWARE.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * @file</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * libswscale API use example.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * @example scaling_video.c</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <<a class="code" href="imgutils_8h.html">libavutil/imgutils.h</a>></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <<a class="code" href="parseutils_8h.html">libavutil/parseutils.h</a>></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <<a class="code" href="swscale_8h.html">libswscale/swscale.h</a>></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="scaling__video_8c.html#aa900f1f8fe783be800a3caea221d8917"> 33</a></span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="scaling__video_8c.html#aa900f1f8fe783be800a3caea221d8917">fill_yuv_image</a>(uint8_t *data[4], <span class="keywordtype">int</span> linesize[4],</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a>, <span class="keywordtype">int</span> <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a>, <span class="keywordtype">int</span> frame_index)</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">int</span> x, y;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="comment">/* Y */</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">for</span> (y = 0; y < <a class="code" href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a>; y++)</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">for</span> (x = 0; x < <a class="code" href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a>; x++)</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  data[0][y * linesize[0] + x] = x + y + frame_index * 3;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="comment">/* Cb and Cr */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">for</span> (y = 0; y < height / 2; y++) {</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">for</span> (x = 0; x < width / 2; x++) {</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  data[1][y * linesize[1] + x] = 128 + y + frame_index * 2;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  data[2][y * linesize[2] + x] = 64 + x + frame_index * 5;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  }</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  }</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> }</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div>
<div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="scaling__video_8c.html#a3c04138a5bfe5d72780bb7e82a18e627"> 52</a></span> <span class="keywordtype">int</span> <a class="code" href="scaling__video_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> {</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  uint8_t *src_data[4], *dst_data[4];</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">int</span> src_linesize[4], dst_linesize[4];</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordtype">int</span> src_w = 320, src_h = 240, dst_w, dst_h;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">enum</span> <a class="code" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> src_pix_fmt = <a class="code" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5a1aa7677092740d8def31655b5d7f0cc2">AV_PIX_FMT_YUV420P</a>, dst_pix_fmt = <a class="code" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5a107eadfcfe8c9fc751289eeb7744a6d3">AV_PIX_FMT_RGB24</a>;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *dst_size = NULL;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *dst_filename = NULL;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  FILE *dst_file;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">int</span> dst_bufsize;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keyword">struct </span>SwsContext *sws_ctx;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">int</span> i, ret;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> (argc != 3) {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  fprintf(stderr, <span class="stringliteral">"Usage: %s output_file output_size\n"</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="stringliteral">"API example program to show how to scale an image with libswscale.\n"</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="stringliteral">"This program generates a series of pictures, rescales them to the given "</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="stringliteral">"output_size and saves them to an output file named output_file\n."</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="stringliteral">"\n"</span>, argv[0]);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  exit(1);</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  dst_filename = argv[1];</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  dst_size = argv[2];</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">if</span> (<a class="code" href="parseutils_8h.html#a4dcdb8a2792f2074ca4a1e1f4ddce2bf">av_parse_video_size</a>(&dst_w, &dst_h, dst_size) < 0) {</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  fprintf(stderr,</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="stringliteral">"Invalid size '%s', must be in the form WxH or a valid size abbreviation\n"</span>,</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  dst_size);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  exit(1);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  }</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  dst_file = fopen(dst_filename, <span class="stringliteral">"wb"</span>);</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">if</span> (!dst_file) {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  fprintf(stderr, <span class="stringliteral">"Could not open destination file %s\n"</span>, dst_filename);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  exit(1);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> </div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">/* create scaling context */</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  sws_ctx = <a class="code" href="group__libsws.html#gaf360d1a9e0e60f906f74d7d44f9abfdd">sws_getContext</a>(src_w, src_h, src_pix_fmt,</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  dst_w, dst_h, dst_pix_fmt,</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <a class="code" href="group__libsws.html#ga26b45a2c6df7c1637feab34fbb21a9bb">SWS_BILINEAR</a>, NULL, NULL, NULL);</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">if</span> (!sws_ctx) {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  fprintf(stderr,</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="stringliteral">"Impossible to create scale context for the conversion "</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="stringliteral">"fmt:%s s:%dx%d -> fmt:%s s:%dx%d\n"</span>,</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <a class="code" href="pixdesc_8h.html#ab92e2a8a9b58c982560c49df9f01e47e">av_get_pix_fmt_name</a>(src_pix_fmt), src_w, src_h,</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <a class="code" href="pixdesc_8h.html#ab92e2a8a9b58c982560c49df9f01e47e">av_get_pix_fmt_name</a>(dst_pix_fmt), dst_w, dst_h);</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  ret = <a class="code" href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a>(EINVAL);</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">/* allocate source and destination image buffers */</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">if</span> ((ret = <a class="code" href="group__lavu__picture.html#ga841e0a89a642e24141af1918a2c10448">av_image_alloc</a>(src_data, src_linesize,</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  src_w, src_h, src_pix_fmt, 16)) < 0) {</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  fprintf(stderr, <span class="stringliteral">"Could not allocate source image\n"</span>);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  }</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">/* buffer is going to be written to rawvideo file, no alignment */</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">if</span> ((ret = <a class="code" href="group__lavu__picture.html#ga841e0a89a642e24141af1918a2c10448">av_image_alloc</a>(dst_data, dst_linesize,</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  dst_w, dst_h, dst_pix_fmt, 1)) < 0) {</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  fprintf(stderr, <span class="stringliteral">"Could not allocate destination image\n"</span>);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">goto</span> end;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  }</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  dst_bufsize = ret;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">for</span> (i = 0; i < 100; i++) {</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">/* generate synthetic video */</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <a class="code" href="scaling__video_8c.html#aa900f1f8fe783be800a3caea221d8917">fill_yuv_image</a>(src_data, src_linesize, src_w, src_h, i);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">/* convert to destination format */</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <a class="code" href="group__libsws.html#gae531c9754c9205d90ad6800015046d74">sws_scale</a>(sws_ctx, (<span class="keyword">const</span> uint8_t * <span class="keyword">const</span>*)src_data,</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  src_linesize, 0, src_h, dst_data, dst_linesize);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="comment">/* write scaled image to file */</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  fwrite(dst_data[0], 1, dst_bufsize, dst_file);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  fprintf(stderr, <span class="stringliteral">"Scaling succeeded. Play the output file with the command:\n"</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="stringliteral">"ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n"</span>,</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <a class="code" href="pixdesc_8h.html#ab92e2a8a9b58c982560c49df9f01e47e">av_get_pix_fmt_name</a>(dst_pix_fmt), dst_w, dst_h, dst_filename);</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> end:</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  fclose(dst_file);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&src_data[0]);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <a class="code" href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a>(&dst_data[0]);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <a class="code" href="group__libsws.html#gad3af0ca76f071dbe0173444db9882932">sws_freeContext</a>(sws_ctx);</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">return</span> ret < 0;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> }</div>
<div class="ttc" id="imgutils_8h_html"><div class="ttname"><a href="imgutils_8h.html">imgutils.h</a></div><div class="ttdoc">misc image utilities </div></div>
<div class="ttc" id="pixfmt_8h_html_a9a8e335cf3be472042bc9f0cf80cd4c5a107eadfcfe8c9fc751289eeb7744a6d3"><div class="ttname"><a href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5a107eadfcfe8c9fc751289eeb7744a6d3">AV_PIX_FMT_RGB24</a></div><div class="ttdoc">packed RGB 8:8:8, 24bpp, RGBRGB... </div><div class="ttdef"><b>Definition:</b> <a href="pixfmt_8h_source.html#l00065">pixfmt.h:65</a></div></div>
<div class="ttc" id="group__lavu__picture_html_ga841e0a89a642e24141af1918a2c10448"><div class="ttname"><a href="group__lavu__picture.html#ga841e0a89a642e24141af1918a2c10448">av_image_alloc</a></div><div class="ttdeci">int av_image_alloc(uint8_t *pointers[4], int linesizes[4], int w, int h, enum AVPixelFormat pix_fmt, int align)</div><div class="ttdoc">Allocate an image with size w and h and pixel format pix_fmt, and fill pointers and linesizes accordi...</div></div>
<div class="ttc" id="group__lavu__mem_html_ga0cc84043ea2167ad005c86e11d0bcdba"><div class="ttname"><a href="group__lavu__mem.html#ga0cc84043ea2167ad005c86e11d0bcdba">av_freep</a></div><div class="ttdeci">void av_freep(void *ptr)</div><div class="ttdoc">Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...</div></div>
<div class="ttc" id="group__libsws_html_ga26b45a2c6df7c1637feab34fbb21a9bb"><div class="ttname"><a href="group__libsws.html#ga26b45a2c6df7c1637feab34fbb21a9bb">SWS_BILINEAR</a></div><div class="ttdeci">#define SWS_BILINEAR</div><div class="ttdef"><b>Definition:</b> <a href="swscale_8h_source.html#l00057">swscale.h:57</a></div></div>
<div class="ttc" id="group__libsws_html_gaf360d1a9e0e60f906f74d7d44f9abfdd"><div class="ttname"><a href="group__libsws.html#gaf360d1a9e0e60f906f74d7d44f9abfdd">sws_getContext</a></div><div class="ttdeci">struct SwsContext * sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat, int dstW, int dstH, enum AVPixelFormat dstFormat, int flags, SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)</div><div class="ttdoc">Allocate and return an SwsContext. </div></div>
<div class="ttc" id="swscale_8h_html"><div class="ttname"><a href="swscale_8h.html">swscale.h</a></div><div class="ttdoc">external API header </div></div>
<div class="ttc" id="group__lavu__error_html_gae4bb6f165973d09584e0ec0f335f69ca"><div class="ttname"><a href="group__lavu__error.html#gae4bb6f165973d09584e0ec0f335f69ca">AVERROR</a></div><div class="ttdeci">#define AVERROR(e)</div><div class="ttdef"><b>Definition:</b> <a href="error_8h_source.html#l00043">error.h:43</a></div></div>
<div class="ttc" id="parseutils_8h_html_a4dcdb8a2792f2074ca4a1e1f4ddce2bf"><div class="ttname"><a href="parseutils_8h.html#a4dcdb8a2792f2074ca4a1e1f4ddce2bf">av_parse_video_size</a></div><div class="ttdeci">int av_parse_video_size(int *width_ptr, int *height_ptr, const char *str)</div><div class="ttdoc">Parse str and put in width_ptr and height_ptr the detected values. </div></div>
<div class="ttc" id="scaling__video_8c_html_aa900f1f8fe783be800a3caea221d8917"><div class="ttname"><a href="scaling__video_8c.html#aa900f1f8fe783be800a3caea221d8917">fill_yuv_image</a></div><div class="ttdeci">static void fill_yuv_image(uint8_t *data[4], int linesize[4], int width, int height, int frame_index)</div><div class="ttdef"><b>Definition:</b> <a href="scaling__video_8c_source.html#l00033">scaling_video.c:33</a></div></div>
<div class="ttc" id="group__libsws_html_gad3af0ca76f071dbe0173444db9882932"><div class="ttname"><a href="group__libsws.html#gad3af0ca76f071dbe0173444db9882932">sws_freeContext</a></div><div class="ttdeci">void sws_freeContext(struct SwsContext *swsContext)</div><div class="ttdoc">Free the swscaler context swsContext. </div></div>
<div class="ttc" id="group__libsws_html_gae531c9754c9205d90ad6800015046d74"><div class="ttname"><a href="group__libsws.html#gae531c9754c9205d90ad6800015046d74">sws_scale</a></div><div class="ttdeci">int sws_scale(struct SwsContext *c, const uint8_t *const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[])</div><div class="ttdoc">Scale the image slice in srcSlice and put the resulting scaled slice in the image in dst...</div></div>
<div class="ttc" id="parseutils_8h_html"><div class="ttname"><a href="parseutils_8h.html">parseutils.h</a></div><div class="ttdoc">misc parsing utilities </div></div>
<div class="ttc" id="scaling__video_8c_html_a3c04138a5bfe5d72780bb7e82a18e627"><div class="ttname"><a href="scaling__video_8c.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a></div><div class="ttdeci">int main(int argc, char **argv)</div><div class="ttdef"><b>Definition:</b> <a href="scaling__video_8c_source.html#l00052">scaling_video.c:52</a></div></div>
<div class="ttc" id="pixfmt_8h_html_a9a8e335cf3be472042bc9f0cf80cd4c5a1aa7677092740d8def31655b5d7f0cc2"><div class="ttname"><a href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5a1aa7677092740d8def31655b5d7f0cc2">AV_PIX_FMT_YUV420P</a></div><div class="ttdoc">planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples) </div><div class="ttdef"><b>Definition:</b> <a href="pixfmt_8h_source.html#l00063">pixfmt.h:63</a></div></div>
<div class="ttc" id="pixdesc_8h_html_ab92e2a8a9b58c982560c49df9f01e47e"><div class="ttname"><a href="pixdesc_8h.html#ab92e2a8a9b58c982560c49df9f01e47e">av_get_pix_fmt_name</a></div><div class="ttdeci">const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)</div><div class="ttdoc">Return the short name for a pixel format, NULL in case pix_fmt is unknown. </div></div>
<div class="ttc" id="demuxing__decoding_8c_html_ad12fc34ce789bce6c8a05d8a17138534"><div class="ttname"><a href="demuxing__decoding_8c.html#ad12fc34ce789bce6c8a05d8a17138534">height</a></div><div class="ttdeci">static int height</div><div class="ttdef"><b>Definition:</b> <a href="demuxing__decoding_8c_source.html#l00039">demuxing_decoding.c:39</a></div></div>
<div class="ttc" id="pixfmt_8h_html_a9a8e335cf3be472042bc9f0cf80cd4c5"><div class="ttname"><a href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a></div><div class="ttdeci">AVPixelFormat</div><div class="ttdoc">Pixel format. </div><div class="ttdef"><b>Definition:</b> <a href="pixfmt_8h_source.html#l00061">pixfmt.h:61</a></div></div>
<div class="ttc" id="demuxing__decoding_8c_html_a2474a5474cbff19523a51eb1de01cda4"><div class="ttname"><a href="demuxing__decoding_8c.html#a2474a5474cbff19523a51eb1de01cda4">width</a></div><div class="ttdeci">static int width</div><div class="ttdef"><b>Definition:</b> <a href="demuxing__decoding_8c_source.html#l00039">demuxing_decoding.c:39</a></div></div>
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