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< title > Shaka Packager SDK: packager/media/base/bit_reader.h Source File< / title >
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< div id = "projectname" > Shaka Packager SDK
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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 >
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< div class = "header" >
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< div class = "title" > bit_reader.h< / div > < / div >
< / div > <!-- header -->
< div class = "contents" >
< 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 >
< 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 >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > // found in the LICENSE file.< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < / div >
< 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 >
< 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 >
< div class = "line" > < a name = "l00009" > < / a > < span class = "lineno" > 9< / span >   < span class = "preprocessor" > #include < sys/types.h> < / 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 = "preprocessor" > #include " packager/base/logging.h" < / span > < / div >
< 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 > shaka {< / div >
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< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "keyword" > namespace < / span > media {< / div >
< 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 = "../../d6/da9/classshaka_1_1media_1_1BitReader.html" > 17< / a > < / span >   < span class = "keyword" > class < / span > < a class = "code" href = "../../d6/da9/classshaka_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 = "../../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 >
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< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   ~< a class = "code" href = "../../d6/da9/classshaka_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 >
< 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 = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > 35< / a > < / span >   < 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 >   DCHECK_LE(num_bits, < 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 >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   < span class = "keywordtype" > bool< / span > ret = ReadBitsInternal(num_bits, & temp);< / div >
< 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 >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   < span class = "keywordflow" > return< / span > ret;< / 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 >   < / div >
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< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < span class = "comment" > // Explicit T=bool overload to make MSVC happy.< / span > < / div >
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< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < 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 >   DCHECK_EQ(num_bits, 1u);< / div >
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< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   uint64_t temp;< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   < span class = "keywordtype" > bool< / span > ret = ReadBitsInternal(num_bits, & temp);< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   *out = temp != 0;< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < span class = "keywordflow" > return< / span > ret;< / 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 >
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< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < 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 >
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< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < / div >
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< 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 >   < 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 >
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< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   < span class = "keywordtype" > bool< / span > condition_read = < span class = "keyword" > true< / span > ;< / div >
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< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < span class = "keywordflow" > if< / span > (!< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#ae40382c4ca4a57b3bb3531a337aebbe4" > ReadBits< / a > (1, & condition_read))< / div >
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< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
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< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   < 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 >
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< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   }< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   < / div >
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< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < 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 >
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< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   < / div >
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< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > < a class = "line" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a1c1e1225c2780383e72996137bb7f86a" > 85< / a > < / span >   < span class = "keywordtype" > size_t< / span > < a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a1c1e1225c2780383e72996137bb7f86a" > bits_available< / a > ()< span class = "keyword" > const < / span > {< / div >
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< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   < span class = "keywordflow" > return< / span > 8 * bytes_left_ + num_remaining_bits_in_curr_byte_;< / 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 >
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< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > < a class = "line" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a6b7456b84d6b463767127b57cd0dc898" > 90< / a > < / span >   < span class = "keywordtype" > size_t< / span > < a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a6b7456b84d6b463767127b57cd0dc898" > 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#a1c1e1225c2780383e72996137bb7f86a" > bits_available< / a > (); }< / 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 = "keyword" > private< / span > :< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / 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 = "l00094" > < / a > < span class = "lineno" > 94< / span >   < span class = "keywordtype" > bool< / span > ReadBitsInternal(< span class = "keywordtype" > size_t< / span > num_bits, uint64_t* out);< / div >
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< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   < / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < span class = "comment" > // Advance to the next byte, loading it into curr_byte_.< / span > < / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < span class = "comment" > // If the num_remaining_bits_in_curr_byte_ is 0 after this function returns,< / span > < / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < span class = "comment" > // the stream has reached the end.< / span > < / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < span class = "keywordtype" > void< / span > UpdateCurrByte();< / 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 >   < span class = "comment" > // Pointer to the next unread (not in curr_byte_) byte in the stream.< / span > < / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   < span class = "keyword" > const< / span > uint8_t* data_;< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   < span class = "comment" > // Initial size of the input data.< / span > < / div >
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< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   < span class = "keywordtype" > size_t< / span > initial_size_;< / 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 >   < span class = "comment" > // Bytes left in the stream (without the curr_byte_).< / span > < / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   < span class = "keywordtype" > size_t< / span > bytes_left_;< / 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" > // Contents of the current byte; first unread bit starting at position< / span > < / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   < span class = "comment" > // 8 - num_remaining_bits_in_curr_byte_ from MSB.< / span > < / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   uint8_t curr_byte_;< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   < span class = "comment" > // Number of bits remaining in curr_byte_< / span > < / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   < span class = "keywordtype" > size_t< / span > num_remaining_bits_in_curr_byte_;< / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   < / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   < span class = "keyword" > private< / span > :< / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   DISALLOW_COPY_AND_ASSIGN(< a class = "code" href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html" > BitReader< / a > );< / 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 >   < / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   } < span class = "comment" > // namespace media< / span > < / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   } < span class = "comment" > // namespace shaka< / span > < / div >
< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   < / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   < span class = "preprocessor" > #endif // MEDIA_BASE_BIT_READER_H_< / span > < / div >
< div class = "ttc" id = "classshaka_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 >
2016-05-24 23:43:16 +00:00
< div class = "ttc" id = "classshaka_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 >
2017-01-06 19:31:11 +00:00
< div class = "ttc" id = "classshaka_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 = "classshaka_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 >
< div class = "ttc" id = "classshaka_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 = "classshaka_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#l00054" > bit_reader.cc:54< / a > < / div > < / div >
< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html_a1c1e1225c2780383e72996137bb7f86a" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a1c1e1225c2780383e72996137bb7f86a" > 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#l00085" > bit_reader.h:85< / a > < / div > < / div >
< div class = "ttc" id = "classshaka_1_1media_1_1BitReader_html_a6b7456b84d6b463767127b57cd0dc898" > < div class = "ttname" > < a href = "../../d6/da9/classshaka_1_1media_1_1BitReader.html#a6b7456b84d6b463767127b57cd0dc898" > 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#l00090" > bit_reader.h:90< / a > < / div > < / div >
2015-10-16 00:33:37 +00:00
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