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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2014 Google Inc. All rights reserved.</span></div>
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||
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Use of this source code is governed by a BSD-style</span></div>
|
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// license that can be found in the LICENSE file or at</span></div>
|
||
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// https://developers.google.com/open-source/licenses/bsd</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/media/base/muxer_util.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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||
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <inttypes.h></span></div>
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||
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
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||
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <string></span></div>
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||
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <vector></span></div>
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||
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
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||
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include "packager/base/strings/string_number_conversions.h"</span></div>
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||
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "packager/base/strings/string_split.h"</span></div>
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||
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "packager/base/strings/stringprintf.h"</span></div>
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||
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
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||
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">namespace </span>edash_packager {</div>
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||
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">namespace </span>{</div>
|
||
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keywordtype">bool</span> ValidateFormatTag(<span class="keyword">const</span> std::string& format_tag) {</div>
|
||
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  DCHECK(!format_tag.empty());</div>
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||
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="comment">// Format tag should follow this prototype: %0[width]d.</span></div>
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||
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">if</span> (format_tag.size() > 3 && format_tag[0] == <span class="charliteral">'%'</span> && format_tag[1] == <span class="charliteral">'0'</span> &&</div>
|
||
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  format_tag[format_tag.size() - 1] == <span class="charliteral">'d'</span>) {</div>
|
||
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordtype">unsigned</span> out;</div>
|
||
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">if</span> (base::StringToUint(format_tag.substr(2, format_tag.size() - 3), &out))</div>
|
||
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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||
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  }</div>
|
||
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  LOG(ERROR) << <span class="stringliteral">"SegmentTemplate: Format tag should follow this prototype: "</span></div>
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||
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  << <span class="stringliteral">"%0[width]d if exist."</span>;</div>
|
||
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> }</div>
|
||
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> } <span class="comment">// namespace</span></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="keyword">namespace </span>media {</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="keywordtype">bool</span> ValidateSegmentTemplate(<span class="keyword">const</span> std::string& segment_template) {</div>
|
||
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (segment_template.empty())</div>
|
||
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
|
||
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  std::vector<std::string> splits;</div>
|
||
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  base::SplitString(segment_template, <span class="charliteral">'$'</span>, &splits);</div>
|
||
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
|
||
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// ISO/IEC 23009-1:2012 5.3.9.4.4 Template-based Segment URL construction.</span></div>
|
||
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// Allowed identifiers: $$, $RepresentationID$, $Number$, $Bandwidth$, $Time$.</span></div>
|
||
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// "$" always appears in pairs, so there should be odd number of splits.</span></div>
|
||
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">if</span> (splits.size() % 2 == 0) {</div>
|
||
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  LOG(ERROR) << <span class="stringliteral">"SegmentTemplate: '$' should appear in pairs."</span>;</div>
|
||
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> <span class="keyword">false</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"> 52</span> </div>
|
||
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordtype">bool</span> has_number = <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">bool</span> has_time = <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// Every second substring in split output should be an identifier.</span></div>
|
||
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 1; i < splits.size(); i += 2) {</div>
|
||
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// Each identifier may be suffixed, within the enclosing ‘$’ characters,</span></div>
|
||
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// with an additional format tag aligned with the printf format tag as</span></div>
|
||
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="comment">// defined in IEEE 1003.1-2008 [10] following this prototype: %0[width]d.</span></div>
|
||
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordtype">size_t</span> format_pos = splits[i].find(<span class="charliteral">'%'</span>);</div>
|
||
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  std::string identifier = splits[i].substr(0, format_pos);</div>
|
||
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">if</span> (format_pos != std::string::npos) {</div>
|
||
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">if</span> (!ValidateFormatTag(splits[i].substr(format_pos)))</div>
|
||
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
|
||
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
|
||
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// TODO(kqyang): Support "RepresentationID".</span></div>
|
||
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (identifier == <span class="stringliteral">"RepresentationID"</span>) {</div>
|
||
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  NOTIMPLEMENTED() << <span class="stringliteral">"SegmentTemplate: $RepresentationID$ is not supported "</span></div>
|
||
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="stringliteral">"yet."</span>;</div>
|
||
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (identifier == <span class="stringliteral">"Number"</span>) {</div>
|
||
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  has_number = <span class="keyword">true</span>;</div>
|
||
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (identifier == <span class="stringliteral">"Time"</span>) {</div>
|
||
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  has_time = <span class="keyword">true</span>;</div>
|
||
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (identifier == <span class="stringliteral">""</span>) {</div>
|
||
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">if</span> (format_pos != std::string::npos) {</div>
|
||
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  LOG(ERROR) << <span class="stringliteral">"SegmentTemplate: $$ should not have any format tags."</span>;</div>
|
||
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div>
|
||
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (identifier != <span class="stringliteral">"Bandwidth"</span>) {</div>
|
||
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  LOG(ERROR) << <span class="stringliteral">"SegmentTemplate: '$"</span> << splits[i]</div>
|
||
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  << <span class="stringliteral">"$' is not a valid identifier."</span>;</div>
|
||
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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>  }</div>
|
||
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span> (has_number && has_time) {</div>
|
||
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  LOG(ERROR) << <span class="stringliteral">"SegmentTemplate: $Number$ and $Time$ should not co-exist."</span>;</div>
|
||
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
||
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  }</div>
|
||
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">if</span> (!has_number && !has_time) {</div>
|
||
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  LOG(ERROR) << <span class="stringliteral">"SegmentTemplate: $Number$ or $Time$ should exist."</span>;</div>
|
||
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">return</span> <span class="keyword">false</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="comment">// Note: The below check is skipped.</span></div>
|
||
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// Strings outside identifiers shall only contain characters that are</span></div>
|
||
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="comment">// permitted within URLs according to RFC 1738.</span></div>
|
||
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
||
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> }</div>
|
||
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
|
||
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> std::string GetSegmentName(<span class="keyword">const</span> std::string& segment_template,</div>
|
||
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  uint64_t segment_start_time,</div>
|
||
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  uint32_t segment_index,</div>
|
||
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  uint32_t bandwidth) {</div>
|
||
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  DCHECK(ValidateSegmentTemplate(segment_template));</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>  std::vector<std::string> splits;</div>
|
||
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  base::SplitString(segment_template, <span class="charliteral">'$'</span>, &splits);</div>
|
||
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// "$" always appears in pairs, so there should be odd number of splits.</span></div>
|
||
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  DCHECK_EQ(1u, splits.size() % 2);</div>
|
||
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div>
|
||
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  std::string segment_name;</div>
|
||
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < splits.size(); ++i) {</div>
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||
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="comment">// Every second substring in split output should be an identifier.</span></div>
|
||
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">// Simply copy the non-identifier part.</span></div>
|
||
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (i % 2 == 0) {</div>
|
||
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  segment_name += splits[i];</div>
|
||
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">continue</span>;</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> (splits[i].empty()) {</div>
|
||
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// "$$" is an escape sequence, replaced with a single "$".</span></div>
|
||
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  segment_name += <span class="stringliteral">"$"</span>;</div>
|
||
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">continue</span>;</div>
|
||
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  }</div>
|
||
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordtype">size_t</span> format_pos = splits[i].find(<span class="charliteral">'%'</span>);</div>
|
||
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  std::string identifier = splits[i].substr(0, format_pos);</div>
|
||
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  DCHECK(identifier == <span class="stringliteral">"Number"</span> || identifier == <span class="stringliteral">"Time"</span> ||</div>
|
||
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  identifier == <span class="stringliteral">"Bandwidth"</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>  std::string format_tag;</div>
|
||
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">if</span> (format_pos != std::string::npos) {</div>
|
||
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  format_tag = splits[i].substr(format_pos);</div>
|
||
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  DCHECK(ValidateFormatTag(format_tag));</div>
|
||
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// Replace %d formatting to correctly format uint64_t.</span></div>
|
||
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  format_tag = format_tag.substr(0, format_tag.size() - 1) + PRIu64;</div>
|
||
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  } <span class="keywordflow">else</span> {</div>
|
||
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="comment">// Default format tag "%01d", modified to format uint64_t correctly.</span></div>
|
||
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  format_tag = <span class="stringliteral">"%01"</span> PRIu64;</div>
|
||
<div class="line"><a name="l00139"></a><span class="lineno"> 139</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>  <span class="keywordflow">if</span> (identifier == <span class="stringliteral">"Number"</span>) {</div>
|
||
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="comment">// SegmentNumber starts from 1.</span></div>
|
||
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  segment_name += base::StringPrintf(</div>
|
||
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  format_tag.c_str(), <span class="keyword">static_cast<</span>uint64_t<span class="keyword">></span>(segment_index + 1));</div>
|
||
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (identifier == <span class="stringliteral">"Time"</span>) {</div>
|
||
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  segment_name +=</div>
|
||
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  base::StringPrintf(format_tag.c_str(), segment_start_time);</div>
|
||
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (identifier == <span class="stringliteral">"Bandwidth"</span>) {</div>
|
||
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  segment_name += base::StringPrintf(format_tag.c_str(),</div>
|
||
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keyword">static_cast<</span>uint64_t<span class="keyword">></span>(bandwidth));</div>
|
||
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  }</div>
|
||
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  }</div>
|
||
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">return</span> segment_name;</div>
|
||
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> }</div>
|
||
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div>
|
||
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> } <span class="comment">// namespace media</span></div>
|
||
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> } <span class="comment">// namespace edash_packager</span></div>
|
||
</div><!-- fragment --></div><!-- contents -->
|
||
<!-- start footer part -->
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||
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Generated on Thu Jan 14 2016 23:03:41 for DASH Media Packaging SDK by  <a href="http://www.doxygen.org/index.html">
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<img class="footer" src="../../doxygen.png" alt="doxygen"/>
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</a> 1.8.6
|
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