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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_279fd47bebb21302c25cfb685e84c359.html" > file< / a > < / li > < / ul >
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< div class = "title" > io_cache.cc< / div > < / div >
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< 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/file/io_cache.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 < string.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 < algorithm> < / 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 = "preprocessor" > #include " packager/base/logging.h" < / span > < / div >
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< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < / div >
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< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "keyword" > namespace < / span > shaka {< / div >
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< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "keyword" > using< / span > base::AutoLock;< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "keyword" > using< / span > base::AutoUnlock;< / 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 = "keyword" > namespace < / span > media {< / 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 >   IoCache::IoCache(uint64_t cache_size)< / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   : cache_size_(cache_size),< / div >
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< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   read_event_(base::WaitableEvent::ResetPolicy::AUTOMATIC,< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   base::WaitableEvent::InitialState::NOT_SIGNALED),< / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   write_event_(base::WaitableEvent::ResetPolicy::AUTOMATIC,< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   base::WaitableEvent::InitialState::NOT_SIGNALED),< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "comment" > // Make the buffer one byte larger than the cache so that when the< / span > < / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "comment" > // condition r_ptr == w_ptr is unambiguous (buffer empty).< / span > < / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   circular_buffer_(cache_size + 1),< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   end_ptr_(& circular_buffer_[0] + cache_size + 1),< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   r_ptr_(circular_buffer_.data()),< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   w_ptr_(circular_buffer_.data()),< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   closed_(false) {}< / 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 >   IoCache::~IoCache() {< / div >
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< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   Close();< / div >
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< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   }< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < / div >
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< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d7c/classshaka_1_1media_1_1IoCache.html#a3cb864f866af25f0ff92c367946b0945" > 40< / a > < / span >   uint64_t IoCache::Read(< span class = "keywordtype" > void< / span > * buffer, uint64_t size) {< / div >
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< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   DCHECK(buffer);< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   < / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   AutoLock lock(lock_);< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   < span class = "keywordflow" > while< / span > (!closed_ & & (BytesCachedInternal() == 0)) {< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   AutoUnlock unlock(lock_);< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   write_event_.Wait();< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   }< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   < / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   size = std::min(size, BytesCachedInternal());< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   uint64_t first_chunk_size(std::min(size, static_cast< uint64_t> (< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   end_ptr_ - r_ptr_)));< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   memcpy(buffer, r_ptr_, first_chunk_size);< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   r_ptr_ += first_chunk_size;< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   DCHECK_GE(end_ptr_, r_ptr_);< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "keywordflow" > if< / span > (r_ptr_ == end_ptr_)< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   r_ptr_ = & circular_buffer_[0];< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   uint64_t second_chunk_size(size - first_chunk_size);< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < span class = "keywordflow" > if< / span > (second_chunk_size) {< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   memcpy(static_cast< uint8_t*> (buffer) + first_chunk_size, r_ptr_,< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   second_chunk_size);< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   r_ptr_ += second_chunk_size;< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   DCHECK_GT(end_ptr_, r_ptr_);< / 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 >   read_event_.Signal();< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   < span class = "keywordflow" > return< / span > size;< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   }< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   < / div >
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< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d7c/classshaka_1_1media_1_1IoCache.html#a0349796209c24a99bfe3c1bfdafb1d28" > 68< / a > < / span >   uint64_t IoCache::Write(< span class = "keyword" > const< / span > < span class = "keywordtype" > void< / span > * buffer, uint64_t size) {< / div >
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< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   DCHECK(buffer);< / 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 >   < span class = "keyword" > const< / span > uint8_t* r_ptr(static_cast< const uint8_t*> (buffer));< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   uint64_t bytes_left(size);< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   < span class = "keywordflow" > while< / span > (bytes_left) {< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   AutoLock lock(lock_);< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   < span class = "keywordflow" > while< / span > (!closed_ & & (BytesFreeInternal() == 0)) {< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   AutoUnlock unlock(lock_);< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   read_event_.Wait();< / 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 = "keywordflow" > if< / span > (closed_)< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   uint64_t write_size(std::min(bytes_left, BytesFreeInternal()));< / div >
< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   uint64_t first_chunk_size(std::min(write_size, static_cast< uint64_t> (< / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   end_ptr_ - w_ptr_)));< / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   memcpy(w_ptr_, r_ptr, first_chunk_size);< / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   w_ptr_ += first_chunk_size;< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   DCHECK_GE(end_ptr_, w_ptr_);< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   < span class = "keywordflow" > if< / span > (w_ptr_ == end_ptr_)< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   w_ptr_ = & circular_buffer_[0];< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   r_ptr += first_chunk_size;< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   uint64_t second_chunk_size(write_size - first_chunk_size);< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   < span class = "keywordflow" > if< / span > (second_chunk_size) {< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   memcpy(w_ptr_, r_ptr, second_chunk_size);< / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   w_ptr_ += second_chunk_size;< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   DCHECK_GT(end_ptr_, w_ptr_);< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   r_ptr += second_chunk_size;< / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   }< / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   bytes_left -= write_size;< / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   write_event_.Signal();< / 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 = "keywordflow" > return< / span > size;< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   }< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < / div >
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< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d7c/classshaka_1_1media_1_1IoCache.html#a29080034b90671628ea681e10ea92a48" > 104< / a > < / span >   < span class = "keywordtype" > void< / span > IoCache::Clear() {< / div >
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< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   AutoLock lock(lock_);< / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   r_ptr_ = w_ptr_ = circular_buffer_.data();< / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < span class = "comment" > // Let any writers know that there is room in the cache.< / span > < / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   read_event_.Signal();< / 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 >   < / div >
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< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d7c/classshaka_1_1media_1_1IoCache.html#a23dfcb4d031d76e980e41d1b1bec7112" > 111< / a > < / span >   < span class = "keywordtype" > void< / span > IoCache::Close() {< / div >
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< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   AutoLock lock(lock_);< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   closed_ = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   read_event_.Signal();< / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   write_event_.Signal();< / 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 >   < / div >
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< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d7c/classshaka_1_1media_1_1IoCache.html#ae751faea047196ba2770f5bf90649185" > 118< / a > < / span >   < span class = "keywordtype" > void< / span > IoCache::Reopen() {< / div >
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< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   AutoLock lock(lock_);< / div >
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   CHECK(closed_);< / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   r_ptr_ = w_ptr_ = circular_buffer_.data();< / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   closed_ = < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   read_event_.Reset();< / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   write_event_.Reset();< / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   }< / div >
< div class = "line" > < a name = "l00126" > < / a > < span class = "lineno" > 126< / span >   < / div >
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< div class = "line" > < a name = "l00127" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d7c/classshaka_1_1media_1_1IoCache.html#a385baed04dd0cc0d3dca20d78f61559f" > 127< / a > < / span >   uint64_t IoCache::BytesCached() {< / div >
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< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > 128< / span >   AutoLock lock(lock_);< / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > 129< / span >   < span class = "keywordflow" > return< / span > BytesCachedInternal();< / 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 >   < / div >
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< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d7c/classshaka_1_1media_1_1IoCache.html#a74e1d7369afe4f03c551b6e67ec82ee9" > 132< / a > < / span >   uint64_t IoCache::BytesFree() {< / div >
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< div class = "line" > < a name = "l00133" > < / a > < span class = "lineno" > 133< / span >   AutoLock lock(lock_);< / div >
< div class = "line" > < a name = "l00134" > < / a > < span class = "lineno" > 134< / span >   < span class = "keywordflow" > return< / span > BytesFreeInternal();< / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   }< / div >
< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   < / div >
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   uint64_t IoCache::BytesCachedInternal() {< / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   < span class = "keywordflow" > return< / span > (r_ptr_ < = w_ptr_)< / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   ? w_ptr_ - r_ptr_< / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   : (end_ptr_ - r_ptr_) + (w_ptr_ - circular_buffer_.data());< / div >
< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   }< / 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 >   uint64_t IoCache::BytesFreeInternal() {< / div >
< div class = "line" > < a name = "l00144" > < / a > < span class = "lineno" > 144< / span >   < span class = "keywordflow" > return< / span > cache_size_ - BytesCachedInternal();< / 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 >
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< div class = "line" > < a name = "l00147" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d7c/classshaka_1_1media_1_1IoCache.html#a841a082bfd88280a4ea00ac1a9e64dac" > 147< / a > < / span >   < span class = "keywordtype" > void< / span > IoCache::WaitUntilEmptyOrClosed() {< / div >
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< div class = "line" > < a name = "l00148" > < / a > < span class = "lineno" > 148< / span >   AutoLock lock(lock_);< / div >
< div class = "line" > < a name = "l00149" > < / a > < span class = "lineno" > 149< / span >   < span class = "keywordflow" > while< / span > (!closed_ & & BytesCachedInternal()) {< / div >
< div class = "line" > < a name = "l00150" > < / a > < span class = "lineno" > 150< / span >   AutoUnlock unlock(lock_);< / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   read_event_.Wait();< / div >
< div class = "line" > < a name = "l00152" > < / a > < span class = "lineno" > 152< / span >   }< / div >
< div class = "line" > < a name = "l00153" > < / a > < span class = "lineno" > 153< / span >   }< / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   < / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   } < span class = "comment" > // namespace media< / span > < / div >
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   } < span class = "comment" > // namespace shaka< / span > < / div >
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