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<li class="navelem"><a class="el" href="../../dir_3f8eec2fc361645de4b1ec14c19fffc7.html">packager</a></li><li class="navelem"><a class="el" href="../../dir_f99dae54fe7170f791f339b952d5067a.html">media</a></li><li class="navelem"><a class="el" href="../../dir_e3bda0bde998a4d5063328245b9909be.html">base</a></li> </ul>
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<div class="title">bit_reader.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright (c) 2012 The Chromium Authors. All rights reserved.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">// Use of this source code is governed by a BSD-style license that can be</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// found in the LICENSE file.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160; </div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="preprocessor">#ifndef PACKAGER_MEDIA_BASE_BIT_READER_H_</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="preprocessor">#define PACKAGER_MEDIA_BASE_BIT_READER_H_</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160; </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="preprocessor">#include &lt;stdint.h&gt;</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &lt;sys/types.h&gt;</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160; </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#include &quot;packager/base/logging.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160; </div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno"><a class="line" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html"> 17</a></span>&#160;<span class="keyword">class </span><a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html">BitReader</a> {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a264dbe3e94ba76214c1af75ab3877945">BitReader</a>(<span class="keyword">const</span> uint8_t* data, <span class="keywordtype">size_t</span> size);</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; ~<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html">BitReader</a>();</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4"> 35</a></span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4">ReadBits</a>(<span class="keywordtype">size_t</span> num_bits, T* out) {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; DCHECK_LE(num_bits, <span class="keyword">sizeof</span>(T) * 8);</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; uint64_t temp;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keywordtype">bool</span> ret = ReadBitsInternal(num_bits, &amp;temp);</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; *out = <span class="keyword">static_cast&lt;</span>T<span class="keyword">&gt;</span>(temp);</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; }</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="comment">// Explicit T=bool overload to make MSVC happy.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4">ReadBits</a>(<span class="keywordtype">size_t</span> num_bits, <span class="keywordtype">bool</span>* out) {</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; DCHECK_EQ(num_bits, 1u);</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; uint64_t temp;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="keywordtype">bool</span> ret = ReadBitsInternal(num_bits, &amp;temp);</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; *out = temp != 0;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; }</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; </div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">SkipBits</a>(<span class="keywordtype">size_t</span> num_bits);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; </div>
<div class="line"><a name="l00069"></a><span class="lineno"><a class="line" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a98bbbbc849a3fadc1a136662174d470e"> 69</a></span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a98bbbbc849a3fadc1a136662174d470e">SkipBitsConditional</a>(<span class="keywordtype">bool</span> condition, <span class="keywordtype">size_t</span> num_bits) {</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordtype">bool</span> condition_read = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="keywordflow">if</span> (!<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4">ReadBits</a>(1, &amp;condition_read))</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordflow">return</span> condition_read == condition ? <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">SkipBits</a>(num_bits) : <span class="keyword">true</span>;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; }</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keywordtype">void</span> <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ab0b44ad45f2afcfecd23c64ae5644694">SkipToNextByte</a>();</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a7d349253d5cc8f9aa33f1ca2ea94677c">SkipBytes</a>(<span class="keywordtype">size_t</span> num_bytes);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; </div>
<div class="line"><a name="l00089"></a><span class="lineno"><a class="line" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a94b03de069b0054ee4a534b12644a986"> 89</a></span>&#160; <span class="keywordtype">size_t</span> <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a94b03de069b0054ee4a534b12644a986">bits_available</a>()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordflow">return</span> 8 * bytes_left_ + num_remaining_bits_in_curr_byte_;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; }</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; </div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a100abf1165633b67359bb3d813594f7e"> 94</a></span>&#160; <span class="keywordtype">size_t</span> <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a100abf1165633b67359bb3d813594f7e">bit_position</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> 8 * initial_size_ - <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a94b03de069b0054ee4a534b12644a986">bits_available</a>(); }</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; </div>
<div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#abc5a89a9c0664a097c55d72d7540ac82"> 97</a></span>&#160; <span class="keyword">const</span> uint8_t* <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#abc5a89a9c0664a097c55d72d7540ac82">current_byte_ptr</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> data_ - 1; }</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; </div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <span class="comment">// Help function used by ReadBits to avoid inlining the bit reading logic.</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordtype">bool</span> ReadBitsInternal(<span class="keywordtype">size_t</span> num_bits, uint64_t* out);</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="comment">// Advance to the next byte, loading it into curr_byte_.</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="comment">// If the num_remaining_bits_in_curr_byte_ is 0 after this function returns,</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="comment">// the stream has reached the end.</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="keywordtype">void</span> UpdateCurrByte();</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="comment">// Pointer to the next unread (not in curr_byte_) byte in the stream.</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="keyword">const</span> uint8_t* data_;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="comment">// Initial size of the input data.</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keywordtype">size_t</span> initial_size_;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="comment">// Bytes left in the stream (without the curr_byte_).</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; <span class="keywordtype">size_t</span> bytes_left_;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; <span class="comment">// Contents of the current byte; first unread bit starting at position</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <span class="comment">// 8 - num_remaining_bits_in_curr_byte_ from MSB.</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; uint8_t curr_byte_;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; <span class="comment">// Number of bits remaining in curr_byte_</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <span class="keywordtype">size_t</span> num_remaining_bits_in_curr_byte_;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; </div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; DISALLOW_COPY_AND_ASSIGN(<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html">BitReader</a>);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160;};</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;} <span class="comment">// namespace shaka</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; </div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;<span class="preprocessor">#endif // PACKAGER_MEDIA_BASE_BIT_READER_H_</span></div>
</div><!-- fragment --></div><!-- contents -->
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_a98bbbbc849a3fadc1a136662174d470e"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a98bbbbc849a3fadc1a136662174d470e">shaka::media::BitReader::SkipBitsConditional</a></div><div class="ttdeci">bool SkipBitsConditional(bool condition, size_t num_bits)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00069">bit_reader.h:69</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_ae40382c4ca4a57b3bb3531a337aebbe4"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4">shaka::media::BitReader::ReadBits</a></div><div class="ttdeci">bool ReadBits(size_t num_bits, T *out)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00035">bit_reader.h:35</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_a100abf1165633b67359bb3d813594f7e"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a100abf1165633b67359bb3d813594f7e">shaka::media::BitReader::bit_position</a></div><div class="ttdeci">size_t bit_position() const</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00094">bit_reader.h:94</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_a94b03de069b0054ee4a534b12644a986"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a94b03de069b0054ee4a534b12644a986">shaka::media::BitReader::bits_available</a></div><div class="ttdeci">size_t bits_available() const</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00089">bit_reader.h:89</a></div></div>
<div class="ttc" id="anamespaceshaka_html"><div class="ttname"><a href="../../d8/daf/namespaceshaka.html">shaka</a></div><div class="ttdoc">All the methods that are virtual are virtual for mocking.</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/d15/gflags__hex__bytes_8cc_source.html#l00011">gflags_hex_bytes.cc:11</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html">shaka::media::BitReader</a></div><div class="ttdoc">A class to read bit streams.</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00017">bit_reader.h:17</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_a7d349253d5cc8f9aa33f1ca2ea94677c"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a7d349253d5cc8f9aa33f1ca2ea94677c">shaka::media::BitReader::SkipBytes</a></div><div class="ttdeci">bool SkipBytes(size_t num_bytes)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/de0/bit__reader_8cc_source.html#l00063">bit_reader.cc:63</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_a264dbe3e94ba76214c1af75ab3877945"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a264dbe3e94ba76214c1af75ab3877945">shaka::media::BitReader::BitReader</a></div><div class="ttdeci">BitReader(const uint8_t *data, size_t size)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/de0/bit__reader_8cc_source.html#l00012">bit_reader.cc:12</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_abc5a89a9c0664a097c55d72d7540ac82"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#abc5a89a9c0664a097c55d72d7540ac82">shaka::media::BitReader::current_byte_ptr</a></div><div class="ttdeci">const uint8_t * current_byte_ptr() const</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00097">bit_reader.h:97</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_ab0b44ad45f2afcfecd23c64ae5644694"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ab0b44ad45f2afcfecd23c64ae5644694">shaka::media::BitReader::SkipToNextByte</a></div><div class="ttdeci">void SkipToNextByte()</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/de0/bit__reader_8cc_source.html#l00054">bit_reader.cc:54</a></div></div>
<div class="ttc" id="aclassshaka_1_1media_1_1BitReader_html_a4ab20ef220c76072eaecb982aba0541d"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">shaka::media::BitReader::SkipBits</a></div><div class="ttdeci">bool SkipBits(size_t num_bits)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/de0/bit__reader_8cc_source.html#l00024">bit_reader.cc:24</a></div></div>
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