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<li class="navelem"><a class="el" href="../../dir_39dc0668bd5a501998f94e8b4e546c71.html">media</a></li><li class="navelem"><a class="el" href="../../dir_c6ada2450b25ab5438a4dba6c9b890af.html">base</a></li> </ul>
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<div class="title">bit_reader.h</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright (c) 2012 The Chromium Authors. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Use of this source code is governed by a BSD-style license that can be</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// found in the LICENSE file.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#ifndef MEDIA_BASE_BIT_READER_H_</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor"></span><span class="preprocessor">#define MEDIA_BASE_BIT_READER_H_</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <stdint.h></span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <sys/types.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 "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>edash_packager {</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"><a class="line" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html"> 17</a></span> <span class="keyword">class </span><a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html">BitReader</a> {</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a7cfecfaf6169a0c9286d62b24e7b934e">BitReader</a>(<span class="keyword">const</span> uint8_t* data, off_t size);</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  ~<a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html">BitReader</a>();</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> T></div>
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<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a9a66cdd1013eb535e7e1eec60a91bf8c"> 35</a></span>  <span class="keywordtype">bool</span> <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a9a66cdd1013eb535e7e1eec60a91bf8c">ReadBits</a>(<span class="keywordtype">int</span> num_bits, T* out) {</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  DCHECK_LE(num_bits, static_cast<int>(<span class="keyword">sizeof</span>(T) * 8));</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  uint64_t temp;</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordtype">bool</span> ret = ReadBitsInternal(num_bits, &temp);</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  *out = <span class="keyword">static_cast<</span>T<span class="keyword">></span>(temp);</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">return</span> ret;</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  }</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordtype">bool</span> <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#acacb97d71aaae01796b90d27e7cdca0a">SkipBits</a>(<span class="keywordtype">int</span> num_bits);</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
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<div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a8a7f24cfdc78211fb2c1a0167c8d903e"> 60</a></span>  <span class="keywordtype">bool</span> <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a8a7f24cfdc78211fb2c1a0167c8d903e">SkipBitsConditional</a>(<span class="keywordtype">bool</span> condition, <span class="keywordtype">int</span> num_bits) {</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">bool</span> condition_read = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">if</span> (!<a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a9a66cdd1013eb535e7e1eec60a91bf8c">ReadBits</a>(1, &condition_read))</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> condition_read == condition ? <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#acacb97d71aaae01796b90d27e7cdca0a">SkipBits</a>(num_bits) : <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordtype">bool</span> <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a71354dfa435a6c16c598da241f71c8a1">SkipBytes</a>(<span class="keywordtype">int</span> num_bytes);</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div>
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<div class="line"><a name="l00076"></a><span class="lineno"><a class="line" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a1409a0968749ca5a55ba823cd718065b"> 76</a></span>  <span class="keywordtype">int</span> <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a1409a0968749ca5a55ba823cd718065b">bits_available</a>()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">return</span> 8 * bytes_left_ + num_remaining_bits_in_curr_byte_;</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a475ab08957dc2e7147b64f307bfc90ab"> 81</a></span>  <span class="keywordtype">int</span> <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a475ab08957dc2e7147b64f307bfc90ab">bit_position</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> 8 * initial_size_ - <a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a1409a0968749ca5a55ba823cd718065b">bits_available</a>(); }</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">// Help function used by ReadBits to avoid inlining the bit reading logic.</span></div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordtype">bool</span> ReadBitsInternal(<span class="keywordtype">int</span> num_bits, uint64_t* out);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">// Advance to the next byte, loading it into curr_byte_.</span></div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">// If the num_remaining_bits_in_curr_byte_ is 0 after this function returns,</span></div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// the stream has reached the end.</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordtype">void</span> UpdateCurrByte();</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// Pointer to the next unread (not in curr_byte_) byte in the stream.</span></div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">const</span> uint8_t* data_;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// Initial size of the input data.</span></div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// TODO(kqyang): Use size_t instead of off_t instead.</span></div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  off_t initial_size_;</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// Bytes left in the stream (without the curr_byte_).</span></div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  off_t bytes_left_;</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">// Contents of the current byte; first unread bit starting at position</span></div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// 8 - num_remaining_bits_in_curr_byte_ from MSB.</span></div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  uint8_t curr_byte_;</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// Number of bits remaining in curr_byte_</span></div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordtype">int</span> num_remaining_bits_in_curr_byte_;</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  DISALLOW_COPY_AND_ASSIGN(<a class="code" href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html">BitReader</a>);</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> };</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> } <span class="comment">// namespace edash_packager</span></div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="preprocessor">#endif // MEDIA_BASE_BIT_READER_H_</span></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1BitReader_html_a7cfecfaf6169a0c9286d62b24e7b934e"><div class="ttname"><a href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a7cfecfaf6169a0c9286d62b24e7b934e">edash_packager::media::BitReader::BitReader</a></div><div class="ttdeci">BitReader(const uint8_t *data, off_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>
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<div class="ttc" id="classedash__packager_1_1media_1_1BitReader_html_a9a66cdd1013eb535e7e1eec60a91bf8c"><div class="ttname"><a href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a9a66cdd1013eb535e7e1eec60a91bf8c">edash_packager::media::BitReader::ReadBits</a></div><div class="ttdeci">bool ReadBits(int 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>
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<div class="ttc" id="classedash__packager_1_1media_1_1BitReader_html_a475ab08957dc2e7147b64f307bfc90ab"><div class="ttname"><a href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a475ab08957dc2e7147b64f307bfc90ab">edash_packager::media::BitReader::bit_position</a></div><div class="ttdeci">int bit_position() const </div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00081">bit_reader.h:81</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1BitReader_html_a1409a0968749ca5a55ba823cd718065b"><div class="ttname"><a href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a1409a0968749ca5a55ba823cd718065b">edash_packager::media::BitReader::bits_available</a></div><div class="ttdeci">int bits_available() const </div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00076">bit_reader.h:76</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1BitReader_html"><div class="ttname"><a href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html">edash_packager::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>
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<div class="ttc" id="classedash__packager_1_1media_1_1BitReader_html_acacb97d71aaae01796b90d27e7cdca0a"><div class="ttname"><a href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#acacb97d71aaae01796b90d27e7cdca0a">edash_packager::media::BitReader::SkipBits</a></div><div class="ttdeci">bool SkipBits(int 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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<div class="ttc" id="classedash__packager_1_1media_1_1BitReader_html_a8a7f24cfdc78211fb2c1a0167c8d903e"><div class="ttname"><a href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a8a7f24cfdc78211fb2c1a0167c8d903e">edash_packager::media::BitReader::SkipBitsConditional</a></div><div class="ttdeci">bool SkipBitsConditional(bool condition, int num_bits)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00060">bit_reader.h:60</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1BitReader_html_a71354dfa435a6c16c598da241f71c8a1"><div class="ttname"><a href="../../df/db4/classedash__packager_1_1media_1_1BitReader.html#a71354dfa435a6c16c598da241f71c8a1">edash_packager::media::BitReader::SkipBytes</a></div><div class="ttdeci">bool SkipBytes(int num_bytes)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/de0/bit__reader_8cc_source.html#l00056">bit_reader.cc:56</a></div></div>
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