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<div class="textblock"><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) 2010 The WebM project authors. All Rights Reserved.</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"> * Use of this source code is governed by a BSD-style license</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * that can be found in the LICENSE file in the root of the source</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * tree. An additional intellectual property rights grant can be found</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * in the file PATENTS. All contributing project authors may</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * be found in the AUTHORS file in the root of the source tree.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> */</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// Simple Decoder</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// ==============</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">// This is an example of a simple decoder loop. It takes an input file</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// containing the compressed data (in IVF format), passes it through the</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// decoder, and writes the decompressed frames to disk. Other decoder</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// examples build upon this one.</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">//</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">// The details of the IVF format have been elided from this example for</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// simplicity of presentation, as IVF files will not generally be used by</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// your application. In general, an IVF file consists of a file header,</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// followed by a variable number of frames. Each frame consists of a frame</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// header followed by a variable length payload. The length of the payload</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">// is specified in the first four bytes of the frame header. The payload is</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// the raw compressed data.</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">// Standard Includes</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// -----------------</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// For decoders, you only have to include `vpx_decoder.h` and then any</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// header files for the specific codecs you use. In this case, we're using</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// vp8.</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">// Initializing The Codec</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// ----------------------</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// The libvpx decoder is initialized by the call to vpx_codec_dec_init().</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// Determining the codec interface to use is handled by VpxVideoReader and the</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// functions prefixed with vpx_video_reader_. Discussion of those functions is</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// beyond the scope of this example, but the main gist is to open the input file</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">// and parse just enough of it to determine if it's a VPx file and which VPx</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">// codec is contained within the file.</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">// Note the NULL pointer passed to vpx_codec_dec_init(). We do that in this</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// example because we want the algorithm to determine the stream configuration</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">// (width/height) and allocate memory automatically.</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">//</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">// Decoding A Frame</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">// Once the frame has been read into memory, it is decoded using the</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// `vpx_codec_decode` function. The call takes a pointer to the data</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// (`frame`) and the length of the data (`frame_size`). No application data</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// is associated with the frame in this example, so the `user_priv`</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">// parameter is NULL. The `deadline` parameter is left at zero for this</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">// example. This parameter is generally only used when doing adaptive post</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment">// processing.</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">// Codecs may produce a variable number of output frames for every call to</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment">// `vpx_codec_decode`. These frames are retrieved by the</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">// `vpx_codec_get_frame` iterator function. The iterator variable `iter` is</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">// initialized to NULL each time `vpx_codec_decode` is called.</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// `vpx_codec_get_frame` is called in a loop, returning a pointer to a</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">// decoded image or NULL to indicate the end of list.</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">// Processing The Decoded Data</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// ---------------------------</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// In this example, we simply write the encoded data to disk. It is</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// important to honor the image's `stride` values.</span></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">// Cleanup</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// -------</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">// The `vpx_codec_destroy` call frees any memory allocated by the codec.</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">// Error Handling</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// --------------</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// This example does not special case any error return codes. If there was</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// an error, a descriptive message is printed and the program exits. With</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// few exceptions, vpx_codec functions return an enumerated error status,</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// with the value `0` indicating success.</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor">#include <stdio.h></span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#include <stdlib.h></span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor">#include <string.h></span></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> <span class="preprocessor">#include "<a class="code" href="vpx__decoder_8h.html">vpx/vpx_decoder.h</a>"</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="preprocessor">#include "../tools_common.h"</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor">#include "../video_reader.h"</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="preprocessor">#include "./vpx_config.h"</span></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> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *exec_name;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="keywordtype">void</span> usage_exit(<span class="keywordtype">void</span>) {</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  fprintf(stderr, <span class="stringliteral">"Usage: %s <infile> <outfile>\n"</span>, exec_name);</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  exit(EXIT_FAILURE);</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> }</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv) {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordtype">int</span> frame_cnt = 0;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  FILE *outfile = NULL;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <a class="code" href="structvpx__codec__ctx.html">vpx_codec_ctx_t</a> codec;</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  VpxVideoReader *reader = NULL;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keyword">const</span> VpxInterface *decoder = NULL;</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">const</span> VpxVideoInfo *info = NULL;</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>  exec_name = argv[0];</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">if</span> (argc != 3) die(<span class="stringliteral">"Invalid number of arguments."</span>);</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  reader = vpx_video_reader_open(argv[1]);</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">if</span> (!reader) die(<span class="stringliteral">"Failed to open %s for reading."</span>, argv[1]);</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="keywordflow">if</span> (!(outfile = fopen(argv[2], <span class="stringliteral">"wb"</span>)))</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  die(<span class="stringliteral">"Failed to open %s for writing."</span>, argv[2]);</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  info = vpx_video_reader_get_info(reader);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (!decoder) die(<span class="stringliteral">"Unknown input codec."</span>);</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>  printf(<span class="stringliteral">"Using %s\n"</span>, <a class="code" href="group__codec.html#ga9eee39f450d8cdcf5aba0e2bda6e5aa8">vpx_codec_iface_name</a>(decoder->codec_interface()));</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">if</span> (<a class="code" href="group__decoder.html#ga8c2f0b12f1bd4927eb3c68b01eab19d3">vpx_codec_dec_init</a>(&codec, decoder->codec_interface(), NULL, 0))</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  die_codec(&codec, <span class="stringliteral">"Failed to initialize decoder."</span>);</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">while</span> (vpx_video_reader_read_frame(reader)) {</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <a class="code" href="group__codec.html#ga6ea348f76b1f8a1fe50e14db684146c6">vpx_codec_iter_t</a> iter = NULL;</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <a class="code" href="structvpx__image.html">vpx_image_t</a> *img = NULL;</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordtype">size_t</span> frame_size = 0;</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *frame =</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  vpx_video_reader_get_frame(reader, &frame_size);</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">if</span> (<a class="code" href="group__decoder.html#ga3441e157a7a69108bca9a069f2ee8e0d">vpx_codec_decode</a>(&codec, frame, (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)frame_size, NULL, 0))</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  die_codec(&codec, <span class="stringliteral">"Failed to decode frame."</span>);</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">while</span> ((img = <a class="code" href="group__decoder.html#ga0e231c3a5ce445fdb2268d741da97500">vpx_codec_get_frame</a>(&codec, &iter)) != NULL) {</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  vpx_img_write(img, outfile);</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  ++frame_cnt;</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  }</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  printf(<span class="stringliteral">"Processed %d frames.\n"</span>, frame_cnt);</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">if</span> (<a class="code" href="group__codec.html#ga6ae21d96909660d0ac978b59a863f53b">vpx_codec_destroy</a>(&codec)) die_codec(&codec, <span class="stringliteral">"Failed to destroy codec"</span>);</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  printf(<span class="stringliteral">"Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n"</span>,</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  info->frame_width, info->frame_height, argv[2]);</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  vpx_video_reader_close(reader);</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  fclose(outfile);</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">return</span> EXIT_SUCCESS;</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> }</div><div class="ttc" id="structvpx__image_html"><div class="ttname"><a href="structvpx__image.html">vpx_image</a></div><div class="ttdoc">Image Descriptor. </div><div class="ttdef"><b>Definition:</b> vpx_image.h:88</div></div>
<div class="ttc" id="vpx__decoder_8h_html"><div class="ttname"><a href="vpx__decoder_8h.html">vpx_decoder.h</a></div><div class="ttdoc">Describes the decoder algorithm interface to applications. </div></div>
<div class="ttc" id="group__codec_html_ga9eee39f450d8cdcf5aba0e2bda6e5aa8"><div class="ttname"><a href="group__codec.html#ga9eee39f450d8cdcf5aba0e2bda6e5aa8">vpx_codec_iface_name</a></div><div class="ttdeci">const char * vpx_codec_iface_name(vpx_codec_iface_t *iface)</div><div class="ttdoc">Return the name for a given interface. </div></div>
<div class="ttc" id="group__decoder_html_ga8c2f0b12f1bd4927eb3c68b01eab19d3"><div class="ttname"><a href="group__decoder.html#ga8c2f0b12f1bd4927eb3c68b01eab19d3">vpx_codec_dec_init</a></div><div class="ttdeci">#define vpx_codec_dec_init(ctx, iface, cfg, flags)</div><div class="ttdoc">Convenience macro for vpx_codec_dec_init_ver() </div><div class="ttdef"><b>Definition:</b> vpx_decoder.h:144</div></div>
<div class="ttc" id="group__decoder_html_ga3441e157a7a69108bca9a069f2ee8e0d"><div class="ttname"><a href="group__decoder.html#ga3441e157a7a69108bca9a069f2ee8e0d">vpx_codec_decode</a></div><div class="ttdeci">vpx_codec_err_t vpx_codec_decode(vpx_codec_ctx_t *ctx, const uint8_t *data, unsigned int data_sz, void *user_priv, long deadline)</div><div class="ttdoc">Decode data. </div></div>
<div class="ttc" id="group__codec_html_ga6ae21d96909660d0ac978b59a863f53b"><div class="ttname"><a href="group__codec.html#ga6ae21d96909660d0ac978b59a863f53b">vpx_codec_destroy</a></div><div class="ttdeci">vpx_codec_err_t vpx_codec_destroy(vpx_codec_ctx_t *ctx)</div><div class="ttdoc">Destroy a codec instance. </div></div>
<div class="ttc" id="group__codec_html_ga6ea348f76b1f8a1fe50e14db684146c6"><div class="ttname"><a href="group__codec.html#ga6ea348f76b1f8a1fe50e14db684146c6">vpx_codec_iter_t</a></div><div class="ttdeci">const void * vpx_codec_iter_t</div><div class="ttdoc">Iterator. </div><div class="ttdef"><b>Definition:</b> vpx_codec.h:187</div></div>
<div class="ttc" id="group__decoder_html_ga0e231c3a5ce445fdb2268d741da97500"><div class="ttname"><a href="group__decoder.html#ga0e231c3a5ce445fdb2268d741da97500">vpx_codec_get_frame</a></div><div class="ttdeci">vpx_image_t * vpx_codec_get_frame(vpx_codec_ctx_t *ctx, vpx_codec_iter_t *iter)</div><div class="ttdoc">Decoded frames iterator. </div></div>
<div class="ttc" id="structvpx__codec__ctx_html"><div class="ttname"><a href="structvpx__codec__ctx.html">vpx_codec_ctx</a></div><div class="ttdoc">Codec context structure. </div><div class="ttdef"><b>Definition:</b> vpx_codec.h:197</div></div>
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