2016-02-17 01:09:50 +00:00
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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_5eb2e460866db0ed29e32d64402e5c22.html" > filters< / a > < / li > < / ul >
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< div class = "title" > nalu_reader.cc< / div > < / div >
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< div class = "contents" >
< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2016 Google Inc. All rights reserved.< / span > < / div >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > //< / span > < / div >
< 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 >
< 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 >
< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < / div >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "preprocessor" > #include " packager/media/filters/nalu_reader.h" < / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < / div >
< div class = "line" > < a name = "l00009" > < / a > < span class = "lineno" > 9< / span >   < span class = "preprocessor" > #include " packager/base/logging.h" < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "preprocessor" > #include " packager/media/base/buffer_reader.h" < / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "preprocessor" > #include " packager/media/filters/h264_parser.h" < / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < span class = "keyword" > namespace < / span > edash_packager {< / div >
< 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 >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < span class = "keyword" > namespace < / span > {< / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "keyword" > inline< / span > < span class = "keywordtype" > bool< / span > IsStartCode(< span class = "keyword" > const< / span > uint8_t* data) {< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "keywordflow" > return< / span > data[0] == 0x00 & & data[1] == 0x00 & & data[2] == 0x01;< / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   }< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   } < span class = "comment" > // namespace< / span > < / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   Nalu::Nalu()< / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   : data_(nullptr),< / div >
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< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   header_size_(0),< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   payload_size_(0),< / div >
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< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   ref_idc_(0),< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   type_(0),< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   is_video_slice_(false) {}< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < / div >
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< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "keywordtype" > bool< / span > Nalu::InitializeFromH264(< span class = "keyword" > const< / span > uint8_t* data, uint64_t size) {< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   DCHECK(data);< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   DCHECK_GT(size, 0u);< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   uint8_t header = data[0];< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordflow" > if< / span > ((header & 0x80) != 0)< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   data_ = data;< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   header_size_ = 1;< / div >
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< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   payload_size_ = size - 1;< / div >
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< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   ref_idc_ = (header > > 5) & 0x3;< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   type_ = header & 0x1F;< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   is_video_slice_ = (type_ > = Nalu::H264_NonIDRSlice & & < / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   type_ < = Nalu::H264_IDRSlice);< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   }< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   < / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a5f09b39b0943708f7eb54f75906dc816" > 47< / a > < / span >   < a class = "code" href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a5f09b39b0943708f7eb54f75906dc816" > NaluReader::NaluReader< / a > (uint8_t nal_length_size,< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   < span class = "keyword" > const< / span > uint8_t* stream,< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   uint64_t stream_size)< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   : stream_(stream),< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   stream_size_(stream_size),< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   nalu_length_size_(nal_length_size),< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   format_(nal_length_size == 0 ? kAnnexbByteStreamFormat< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   : kNalUnitStreamFormat) {< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   DCHECK(stream);< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   }< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   NaluReader::~NaluReader() {}< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#af9382cd46f2f4d22636f7f5513e8df1d" > 59< / a > < / span >   NaluReader::Result < a class = "code" href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#af9382cd46f2f4d22636f7f5513e8df1d" > NaluReader::Advance< / a > (< a class = "code" href = "../../d2/d72/classedash__packager_1_1media_1_1Nalu.html" > Nalu< / a > * nalu) {< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   < span class = "keywordflow" > if< / span > (stream_size_ < = 0)< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "keywordflow" > return< / span > NaluReader::kEOStream;< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   uint8_t nalu_length_size_or_start_code_size;< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   uint64_t nalu_length;< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   < span class = "keywordflow" > if< / span > (format_ == kAnnexbByteStreamFormat) {< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   < span class = "comment" > // This will move |stream_| to the start code.< / span > < / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   uint64_t nalu_length_with_header;< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   < span class = "keywordflow" > if< / span > (!LocateNaluByStartCode(& nalu_length_with_header,< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   & nalu_length_size_or_start_code_size)) {< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Could not find next NALU, bytes left in stream: " < / span > < / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < < stream_size_;< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "comment" > // This is actually an error. Since we always move to past the end of< / span > < / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   < span class = "comment" > // each NALU, if there is no next start code, then this is the first call< / span > < / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   < span class = "comment" > // and there are no start codes in the stream.< / span > < / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   < span class = "keywordflow" > return< / span > NaluReader::kInvalidStream;< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   }< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   nalu_length = nalu_length_with_header - nalu_length_size_or_start_code_size;< / div >
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< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   } < span class = "keywordflow" > else< / span > {< / div >
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< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   < a class = "code" href = "../../d9/d46/classedash__packager_1_1media_1_1BufferReader.html" > BufferReader< / a > reader(stream_, stream_size_);< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   < span class = "keywordflow" > if< / span > (!reader.< a class = "code" href = "../../d9/d46/classedash__packager_1_1media_1_1BufferReader.html#ac21a2b3a9ed6b2ad20247b6f653d8a02" > ReadNBytesInto8< / a > (& nalu_length, nalu_length_size_))< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < span class = "keywordflow" > return< / span > NaluReader::kInvalidStream;< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   nalu_length_size_or_start_code_size = nalu_length_size_;< / 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 = "keywordflow" > if< / span > (nalu_length + nalu_length_size_ > stream_size_) {< / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   LOG(ERROR) < < < span class = "stringliteral" > " NALU length exceeds stream size: " < / span > < / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   < < stream_size_ < < < span class = "stringliteral" > " < " < / span > < < nalu_length;< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   < span class = "keywordflow" > return< / span > NaluReader::kInvalidStream;< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   }< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   < span class = "keywordflow" > if< / span > (nalu_length == 0) {< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   LOG(ERROR) < < < span class = "stringliteral" > " NALU size 0" < / span > ;< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   < span class = "keywordflow" > return< / span > NaluReader::kInvalidStream;< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   }< / 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 = "keyword" > const< / span > uint8_t* nalu_data = stream_ + nalu_length_size_or_start_code_size;< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < span class = "keywordflow" > if< / span > (!nalu-> InitializeFromH264(nalu_data, nalu_length))< / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < span class = "keywordflow" > return< / span > NaluReader::kInvalidStream;< / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < span class = "comment" > // Move parser state to after this NALU, so next time Advance< / span > < / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   < span class = "comment" > // is called, we will effectively be skipping it.< / span > < / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   stream_ += nalu_length_size_or_start_code_size + nalu_length;< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   stream_size_ -= nalu_length_size_or_start_code_size + nalu_length;< / 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 >   DVLOG(4) < < < span class = "stringliteral" > " NALU type: " < / span > < < < span class = "keyword" > static_cast< < / span > < span class = "keywordtype" > int< / span > < span class = "keyword" > > < / span > (nalu-> type())< / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   < < < span class = "stringliteral" > " at: " < / span > < < reinterpret_cast< const void*> (nalu-> data())< / div >
2016-02-27 01:13:10 +00:00
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < < < span class = "stringliteral" > " data size: " < / span > < < nalu-> payload_size()< / div >
2016-02-23 19:58:24 +00:00
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < < < span class = "stringliteral" > " ref: " < / span > < < < span class = "keyword" > static_cast< < / span > < span class = "keywordtype" > int< / span > < span class = "keyword" > > < / span > (nalu-> ref_idc());< / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   < / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < span class = "keywordflow" > return< / span > NaluReader::kOk;< / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   }< / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   < / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > < a class = "line" href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a0f700b8bc3163065111b77d6a37a92db" > 112< / a > < / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a0f700b8bc3163065111b77d6a37a92db" > NaluReader::StartsWithStartCode< / a > () {< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < span class = "keywordflow" > if< / span > (stream_size_ > = 3) {< / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   < span class = "keywordflow" > if< / span > (IsStartCode(stream_))< / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / 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 = "keywordflow" > if< / span > (stream_size_ > = 4) {< / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   < span class = "keywordflow" > if< / span > (stream_[0] == 0x00 & & IsStartCode(stream_ + 1))< / div >
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / 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 = "keywordflow" > return< / span > < span class = "keyword" > false< / 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 >   < / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   < span class = "comment" > // static< / span > < / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   < span class = "keywordtype" > bool< / span > NaluReader::FindStartCode(< span class = "keyword" > const< / span > uint8_t* data,< / div >
< div class = "line" > < a name = "l00126" > < / a > < span class = "lineno" > 126< / span >   uint64_t data_size,< / div >
< div class = "line" > < a name = "l00127" > < / a > < span class = "lineno" > 127< / span >   uint64_t* offset,< / div >
< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > 128< / span >   uint8_t* start_code_size) {< / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > 129< / span >   uint64_t bytes_left = data_size;< / div >
< div class = "line" > < a name = "l00130" > < / a > < span class = "lineno" > 130< / span >   < / div >
< div class = "line" > < a name = "l00131" > < / a > < span class = "lineno" > 131< / span >   < span class = "keywordflow" > while< / span > (bytes_left > = 3) {< / div >
< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > 132< / span >   < span class = "keywordflow" > if< / span > (IsStartCode(data)) {< / div >
< div class = "line" > < a name = "l00133" > < / a > < span class = "lineno" > 133< / span >   < span class = "comment" > // Found three-byte start code, set pointer at its beginning.< / span > < / div >
< div class = "line" > < a name = "l00134" > < / a > < span class = "lineno" > 134< / span >   *offset = data_size - bytes_left;< / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   *start_code_size = 3;< / div >
2016-02-17 01:09:50 +00:00
< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   < / div >
2016-02-23 19:58:24 +00:00
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   < span class = "comment" > // If there is a zero byte before this start code,< / span > < / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   < span class = "comment" > // then it' s actually a four-byte start code, so backtrack one byte.< / span > < / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   < span class = "keywordflow" > if< / span > (*offset > 0 & & *(data - 1) == 0x00) {< / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   --(*offset);< / div >
< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   ++(*start_code_size);< / div >
< div class = "line" > < a name = "l00142" > < / a > < span class = "lineno" > 142< / span >   }< / 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 >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / 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 >   < / div >
< div class = "line" > < a name = "l00147" > < / a > < span class = "lineno" > 147< / span >   ++data;< / div >
< div class = "line" > < a name = "l00148" > < / a > < span class = "lineno" > 148< / span >   --bytes_left;< / div >
< div class = "line" > < a name = "l00149" > < / a > < span class = "lineno" > 149< / span >   }< / div >
< div class = "line" > < a name = "l00150" > < / a > < span class = "lineno" > 150< / span >   < / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   < span class = "comment" > // End of data: offset is pointing to the first byte that was not considered< / span > < / div >
< div class = "line" > < a name = "l00152" > < / a > < span class = "lineno" > 152< / span >   < span class = "comment" > // as a possible start of a start code.< / span > < / div >
< div class = "line" > < a name = "l00153" > < / a > < span class = "lineno" > 153< / span >   *offset = data_size - bytes_left;< / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   *start_code_size = 0;< / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   }< / div >
< div class = "line" > < a name = "l00157" > < / a > < span class = "lineno" > 157< / span >   < / div >
< div class = "line" > < a name = "l00158" > < / a > < span class = "lineno" > 158< / span >   < span class = "keywordtype" > bool< / span > NaluReader::LocateNaluByStartCode(uint64_t* nalu_size,< / div >
< div class = "line" > < a name = "l00159" > < / a > < span class = "lineno" > 159< / span >   uint8_t* start_code_size) {< / div >
< div class = "line" > < a name = "l00160" > < / a > < span class = "lineno" > 160< / span >   < span class = "comment" > // Find the start code of next NALU.< / span > < / div >
< div class = "line" > < a name = "l00161" > < / a > < span class = "lineno" > 161< / span >   uint64_t nalu_start_off = 0;< / div >
< div class = "line" > < a name = "l00162" > < / a > < span class = "lineno" > 162< / span >   uint8_t annexb_start_code_size = 0;< / div >
< div class = "line" > < a name = "l00163" > < / a > < span class = "lineno" > 163< / span >   < span class = "keywordflow" > if< / span > (!FindStartCode(stream_, stream_size_,< / div >
< div class = "line" > < a name = "l00164" > < / a > < span class = "lineno" > 164< / span >   & nalu_start_off, & annexb_start_code_size)) {< / div >
< div class = "line" > < a name = "l00165" > < / a > < span class = "lineno" > 165< / span >   DVLOG(4) < < < span class = "stringliteral" > " Could not find start code, end of stream?" < / span > ;< / div >
< div class = "line" > < a name = "l00166" > < / a > < span class = "lineno" > 166< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00167" > < / a > < span class = "lineno" > 167< / span >   }< / div >
< div class = "line" > < a name = "l00168" > < / a > < span class = "lineno" > 168< / span >   < / div >
< div class = "line" > < a name = "l00169" > < / a > < span class = "lineno" > 169< / span >   < span class = "comment" > // Move the stream to the beginning of the NALU (pointing at the start code).< / span > < / div >
< div class = "line" > < a name = "l00170" > < / a > < span class = "lineno" > 170< / span >   stream_ += nalu_start_off;< / div >
< div class = "line" > < a name = "l00171" > < / a > < span class = "lineno" > 171< / span >   stream_size_ -= nalu_start_off;< / div >
< div class = "line" > < a name = "l00172" > < / a > < span class = "lineno" > 172< / span >   < / div >
< div class = "line" > < a name = "l00173" > < / a > < span class = "lineno" > 173< / span >   < span class = "keyword" > const< / span > uint8_t* nalu_data = stream_ + annexb_start_code_size;< / div >
< div class = "line" > < a name = "l00174" > < / a > < span class = "lineno" > 174< / span >   uint64_t max_nalu_data_size = stream_size_ - annexb_start_code_size;< / div >
< div class = "line" > < a name = "l00175" > < / a > < span class = "lineno" > 175< / span >   < span class = "keywordflow" > if< / span > (max_nalu_data_size < = 0) {< / div >
< div class = "line" > < a name = "l00176" > < / a > < span class = "lineno" > 176< / span >   DVLOG(3) < < < span class = "stringliteral" > " End of stream" < / span > ;< / div >
< div class = "line" > < a name = "l00177" > < / a > < span class = "lineno" > 177< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00178" > < / a > < span class = "lineno" > 178< / span >   }< / div >
< div class = "line" > < a name = "l00179" > < / a > < span class = "lineno" > 179< / span >   < / div >
< div class = "line" > < a name = "l00180" > < / a > < span class = "lineno" > 180< / span >   < span class = "comment" > // Find the start code of next NALU;< / span > < / div >
< div class = "line" > < a name = "l00181" > < / a > < span class = "lineno" > 181< / span >   < span class = "comment" > // if successful, |nalu_size_without_start_code| is the number of bytes from< / span > < / div >
< div class = "line" > < a name = "l00182" > < / a > < span class = "lineno" > 182< / span >   < span class = "comment" > // after previous start code to before this one;< / span > < / div >
< div class = "line" > < a name = "l00183" > < / a > < span class = "lineno" > 183< / span >   < span class = "comment" > // if next start code is not found, it is still a valid NALU since there< / span > < / div >
< div class = "line" > < a name = "l00184" > < / a > < span class = "lineno" > 184< / span >   < span class = "comment" > // are some bytes left after the first start code: all the remaining bytes< / span > < / div >
< div class = "line" > < a name = "l00185" > < / a > < span class = "lineno" > 185< / span >   < span class = "comment" > // belong to the current NALU.< / span > < / div >
< div class = "line" > < a name = "l00186" > < / a > < span class = "lineno" > 186< / span >   uint64_t nalu_size_without_start_code = 0;< / div >
< div class = "line" > < a name = "l00187" > < / a > < span class = "lineno" > 187< / span >   uint8_t next_start_code_size = 0;< / div >
< div class = "line" > < a name = "l00188" > < / a > < span class = "lineno" > 188< / span >   < span class = "keywordflow" > if< / span > (!FindStartCode(nalu_data, max_nalu_data_size,< / div >
< div class = "line" > < a name = "l00189" > < / a > < span class = "lineno" > 189< / span >   & nalu_size_without_start_code, & next_start_code_size)) {< / div >
< div class = "line" > < a name = "l00190" > < / a > < span class = "lineno" > 190< / span >   nalu_size_without_start_code = max_nalu_data_size;< / div >
< div class = "line" > < a name = "l00191" > < / a > < span class = "lineno" > 191< / span >   }< / div >
< div class = "line" > < a name = "l00192" > < / a > < span class = "lineno" > 192< / span >   *nalu_size = nalu_size_without_start_code + annexb_start_code_size;< / div >
< div class = "line" > < a name = "l00193" > < / a > < span class = "lineno" > 193< / span >   *start_code_size = annexb_start_code_size;< / div >
< div class = "line" > < a name = "l00194" > < / a > < span class = "lineno" > 194< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00195" > < / a > < span class = "lineno" > 195< / span >   }< / div >
< div class = "line" > < a name = "l00196" > < / a > < span class = "lineno" > 196< / span >   < / div >
< div class = "line" > < a name = "l00197" > < / a > < span class = "lineno" > 197< / span >   } < span class = "comment" > // namespace media< / span > < / div >
< div class = "line" > < a name = "l00198" > < / a > < span class = "lineno" > 198< / span >   } < span class = "comment" > // namespace edash_packager< / span > < / div >
2016-02-17 01:09:50 +00:00
< div class = "ttc" id = "classedash__packager_1_1media_1_1Nalu_html" > < div class = "ttname" > < a href = "../../d2/d72/classedash__packager_1_1media_1_1Nalu.html" > edash_packager::media::Nalu< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d4/d87/nalu__reader_8h_source.html#l00026" > nalu_reader.h:26< / a > < / div > < / div >
2016-02-23 19:58:24 +00:00
< div class = "ttc" id = "classedash__packager_1_1media_1_1NaluReader_html_a5f09b39b0943708f7eb54f75906dc816" > < div class = "ttname" > < a href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a5f09b39b0943708f7eb54f75906dc816" > edash_packager::media::NaluReader::NaluReader< / a > < / div > < div class = "ttdeci" > NaluReader(uint8_t nal_length_size, const uint8_t *stream, uint64_t stream_size)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d1/df5/nalu__reader_8cc_source.html#l00047" > nalu_reader.cc:47< / a > < / div > < / div >
< div class = "ttc" id = "classedash__packager_1_1media_1_1NaluReader_html_af9382cd46f2f4d22636f7f5513e8df1d" > < div class = "ttname" > < a href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#af9382cd46f2f4d22636f7f5513e8df1d" > edash_packager::media::NaluReader::Advance< / a > < / div > < div class = "ttdeci" > Result Advance(Nalu *nalu)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d1/df5/nalu__reader_8cc_source.html#l00059" > nalu_reader.cc:59< / a > < / div > < / div >
< div class = "ttc" id = "classedash__packager_1_1media_1_1NaluReader_html_a0f700b8bc3163065111b77d6a37a92db" > < div class = "ttname" > < a href = "../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a0f700b8bc3163065111b77d6a37a92db" > edash_packager::media::NaluReader::StartsWithStartCode< / a > < / div > < div class = "ttdeci" > bool StartsWithStartCode()< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d1/df5/nalu__reader_8cc_source.html#l00112" > nalu_reader.cc:112< / a > < / div > < / div >
2016-02-17 01:09:50 +00:00
< div class = "ttc" id = "classedash__packager_1_1media_1_1BufferReader_html_ac21a2b3a9ed6b2ad20247b6f653d8a02" > < div class = "ttname" > < a href = "../../d9/d46/classedash__packager_1_1media_1_1BufferReader.html#ac21a2b3a9ed6b2ad20247b6f653d8a02" > edash_packager::media::BufferReader::ReadNBytesInto8< / a > < / div > < div class = "ttdeci" > bool ReadNBytesInto8(uint64_t *v, size_t num_bytes) WARN_UNUSED_RESULT< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../dd/dbc/buffer__reader_8cc_source.html#l00040" > buffer_reader.cc:40< / a > < / div > < / div >
< div class = "ttc" id = "classedash__packager_1_1media_1_1BufferReader_html" > < div class = "ttname" > < a href = "../../d9/d46/classedash__packager_1_1media_1_1BufferReader.html" > edash_packager::media::BufferReader< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../de/d3e/buffer__reader_8h_source.html#l00023" > buffer_reader.h:23< / a > < / div > < / div >
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2016-03-03 22:48:19 +00:00
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