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2015-12-15 20:37:40 +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_65f7acfa8cf3a5f1edc11faa2428b914.html" > formats< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_5039d854a18988ed1f1dbebc120ffbf7.html" > webm< / a > < / li > < / ul >
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< div class = "title" > seek_head.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 2015 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/formats/webm/seek_head.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 < limits> < / 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/third_party/libwebm/src/mkvmuxerutil.hpp" < / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "preprocessor" > #include " packager/third_party/libwebm/src/webmids.hpp" < / span > < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "keyword" > namespace < / span > edash_packager {< / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "keyword" > namespace < / span > media {< / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < span class = "keyword" > namespace < / span > {< / div >
2016-04-06 20:29:08 +00:00
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "keyword" > const< / span > mkvmuxer::uint64 kElementIds[] = {< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   mkvmuxer::kMkvInfo, mkvmuxer::kMkvTracks, mkvmuxer::kMkvCluster,< / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   mkvmuxer::kMkvCues,< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   };< / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > kElementIdCount = arraysize(kElementIds);< / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   uint64_t MaxSeekEntrySize() {< / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "keyword" > const< / span > uint64_t max_entry_payload_size =< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   EbmlElementSize(< / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   mkvmuxer::kMkvSeekID,< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   static_cast< mkvmuxer::uint64> (std::numeric_limits< uint32_t> ::max())) +< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   EbmlElementSize(mkvmuxer::kMkvSeekPosition,< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   std::numeric_limits< mkvmuxer::uint64> ::max());< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "keyword" > const< / span > uint64_t max_entry_size =< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   EbmlMasterElementSize(mkvmuxer::kMkvSeek, max_entry_payload_size) +< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   max_entry_payload_size;< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordflow" > return< / span > max_entry_size;< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   }< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   } < span class = "comment" > // namespace< / span > < / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   SeekHead::SeekHead()< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   : cluster_pos_(-1),< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   cues_pos_(-1),< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   info_pos_(-1),< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   tracks_pos_(-1),< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   wrote_void_(false) {}< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   SeekHead::~SeekHead() {}< / 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 = "../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a3f8fbcfde953b6316586493c3e314387" > 47< / a > < / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a3f8fbcfde953b6316586493c3e314387" > SeekHead::Write< / a > (mkvmuxer::IMkvWriter* writer) {< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   std::vector< uint64_t> element_sizes;< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < span class = "keyword" > const< / span > uint64_t payload_size = GetPayloadSize(& element_sizes);< / 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 >   < span class = "keywordflow" > if< / span > (payload_size == 0) {< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   }< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "keyword" > const< / span > int64_t start_pos = writer-> Position();< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "keywordflow" > if< / span > (!WriteEbmlMasterElement(writer, mkvmuxer::kMkvSeekHead, payload_size))< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keyword" > const< / span > int64_t positions[] = {info_pos_, tracks_pos_, cluster_pos_, cues_pos_};< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < kElementIdCount; ++i) {< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "keywordflow" > if< / span > (element_sizes[i] == 0)< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < span class = "keywordflow" > continue< / span > ;< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   < / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   < span class = "keyword" > const< / span > mkvmuxer::uint64 position =< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   < span class = "keyword" > static_cast< < / span > mkvmuxer::uint64< span class = "keyword" > > < / span > (positions[i]);< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   < span class = "keywordflow" > if< / span > (!WriteEbmlMasterElement(writer, mkvmuxer::kMkvSeek, element_sizes[i]) ||< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   !WriteEbmlElement(writer, mkvmuxer::kMkvSeekID, kElementIds[i]) ||< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   !WriteEbmlElement(writer, mkvmuxer::kMkvSeekPosition, position))< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   }< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "comment" > // If we wrote void before, then fill in the extra with void.< / span > < / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   < span class = "keywordflow" > if< / span > (wrote_void_) {< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   < span class = "keyword" > const< / span > uint64_t max_payload_size = kElementIdCount * MaxSeekEntrySize();< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   < span class = "keyword" > const< / span > uint64_t total_void_size =< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   EbmlMasterElementSize(mkvmuxer::kMkvSeekHead, max_payload_size) +< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   max_payload_size;< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   < / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   < span class = "keyword" > const< / span > uint64_t extra_void =< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   total_void_size - (writer-> Position() - start_pos);< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < span class = "keywordflow" > if< / span > (!WriteVoidElement(writer, extra_void))< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / 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 >   < / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   }< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   < / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > < a class = "line" href = "../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a5afa61eb7ec1bf28d60f4e2a7d9a9b4a" > 88< / a > < / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a5afa61eb7ec1bf28d60f4e2a7d9a9b4a" > SeekHead::WriteVoid< / a > (mkvmuxer::IMkvWriter* writer) {< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   < span class = "keyword" > const< / span > uint64_t payload_size = kElementIdCount * MaxSeekEntrySize();< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   < span class = "keyword" > const< / span > uint64_t total_size =< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   EbmlMasterElementSize(mkvmuxer::kMkvSeekHead, payload_size) +< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   payload_size;< / 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 >   wrote_void_ = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   < span class = "keyword" > const< / span > uint64_t written = WriteVoidElement(writer, total_size);< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < span class = "keywordflow" > if< / span > (!written)< / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / 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 = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   }< / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   < / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   uint64_t SeekHead::GetPayloadSize(std::vector< uint64_t> * data) {< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < span class = "keyword" > const< / span > int64_t positions[] = {info_pos_, tracks_pos_, cluster_pos_, cues_pos_};< / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   uint64_t total_payload_size = 0;< / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   data-> resize(kElementIdCount);< / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < kElementIdCount; ++i) {< / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < span class = "keywordflow" > if< / span > (positions[i] < 0) {< / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   (*data)[i] = 0;< / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < span class = "keywordflow" > continue< / span > ;< / 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" > 112< / span >   < span class = "keyword" > const< / span > mkvmuxer::uint64 position =< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < span class = "keyword" > static_cast< < / span > mkvmuxer::uint64< span class = "keyword" > > < / span > (positions[i]);< / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   (*data)[i] = EbmlElementSize(mkvmuxer::kMkvSeekID, kElementIds[i]) +< / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   EbmlElementSize(mkvmuxer::kMkvSeekPosition, position);< / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   total_payload_size +=< / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   data-> at(i) + EbmlMasterElementSize(mkvmuxer::kMkvSeek, data-> at(i));< / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   }< / div >
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   < / div >
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   < span class = "keywordflow" > return< / span > total_payload_size;< / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / 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 >   } < span class = "comment" > // namespace media< / span > < / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   } < span class = "comment" > // namespace edash_packager< / span > < / div >
< div class = "ttc" id = "classedash__packager_1_1media_1_1SeekHead_html_a3f8fbcfde953b6316586493c3e314387" > < div class = "ttname" > < a href = "../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a3f8fbcfde953b6316586493c3e314387" > edash_packager::media::SeekHead::Write< / a > < / div > < div class = "ttdeci" > bool Write(mkvmuxer::IMkvWriter *writer)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d3/dbc/seek__head_8cc_source.html#l00047" > seek_head.cc:47< / a > < / div > < / div >
< div class = "ttc" id = "classedash__packager_1_1media_1_1SeekHead_html_a5afa61eb7ec1bf28d60f4e2a7d9a9b4a" > < div class = "ttname" > < a href = "../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a5afa61eb7ec1bf28d60f4e2a7d9a9b4a" > edash_packager::media::SeekHead::WriteVoid< / a > < / div > < div class = "ttdeci" > bool WriteVoid(mkvmuxer::IMkvWriter *writer)< / div > < div class = "ttdoc" > Writes a void element large enough to fit the SeekHead. < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d3/dbc/seek__head_8cc_source.html#l00088" > seek_head.cc:88< / a > < / div > < / div >
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