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<li class="navelem"><a class="el" href="../../dir_39dc0668bd5a501998f94e8b4e546c71.html">media</a></li><li class="navelem"><a class="el" href="../../dir_c6ada2450b25ab5438a4dba6c9b890af.html">base</a></li> </ul>
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<div class="title">byte_queue.cc</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright (c) 2011 The Chromium Authors. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Use of this source code is governed by a BSD-style license that can be</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// found in the LICENSE file.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "packager/media/base/byte_queue.h"</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// Default starting size for the queue.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">enum</span> { kDefaultQueueSize = 1024 };</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> ByteQueue::ByteQueue()</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  : buffer_(new uint8_t[kDefaultQueueSize]),</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  size_(kDefaultQueueSize),</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  offset_(0),</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  used_(0) {</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> }</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> ByteQueue::~ByteQueue() {}</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
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<div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#ab1659ef71098c37e9fb4e55ab1664e84"> 24</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#ab1659ef71098c37e9fb4e55ab1664e84">ByteQueue::Reset</a>() {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  offset_ = 0;</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  used_ = 0;</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> }</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
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<div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#acea792e406efe5119cec2e3e522e02c2"> 29</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#acea792e406efe5119cec2e3e522e02c2">ByteQueue::Push</a>(<span class="keyword">const</span> uint8_t* data, <span class="keywordtype">int</span> size) {</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  DCHECK(data);</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  DCHECK_GT(size, 0);</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordtype">size_t</span> size_needed = used_ + size;</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">// Check to see if we need a bigger buffer.</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">if</span> (size_needed > size_) {</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordtype">size_t</span> new_size = 2 * size_;</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">while</span> (size_needed > new_size && new_size > size_)</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  new_size *= 2;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// Sanity check to make sure we didn't overflow.</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  CHECK_GT(new_size, size_);</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  std::unique_ptr<uint8_t[]> new_buffer(<span class="keyword">new</span> uint8_t[new_size]);</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// Copy the data from the old buffer to the start of the new one.</span></div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">if</span> (used_ > 0)</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  memcpy(new_buffer.get(), front(), used_);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  buffer_.reset(new_buffer.release());</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  size_ = new_size;</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  offset_ = 0;</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((offset_ + used_ + size) > size_) {</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// The buffer is big enough, but we need to move the data in the queue.</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  memmove(buffer_.get(), front(), used_);</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  offset_ = 0;</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  }</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  memcpy(front() + used_, data, size);</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  used_ += size;</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> }</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"><a class="line" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a838fe5642e533477a5e229981e5f06e7"> 63</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a838fe5642e533477a5e229981e5f06e7">ByteQueue::Peek</a>(<span class="keyword">const</span> uint8_t** data, <span class="keywordtype">int</span>* size)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  DCHECK(data);</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  DCHECK(size);</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  *data = front();</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  *size = used_;</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> }</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a name="l00070"></a><span class="lineno"><a class="line" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a31b30d39d14fca3ce722b4233de95c79"> 70</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a31b30d39d14fca3ce722b4233de95c79">ByteQueue::Pop</a>(<span class="keywordtype">int</span> count) {</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  DCHECK_LE(count, used_);</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  offset_ += count;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  used_ -= count;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// Move the offset back to 0 if we have reached the end of the buffer.</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">if</span> (offset_ == size_) {</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  DCHECK_EQ(used_, 0);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  offset_ = 0;</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> }</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> uint8_t* ByteQueue::front()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> buffer_.get() + offset_;</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> }</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1ByteQueue_html_acea792e406efe5119cec2e3e522e02c2"><div class="ttname"><a href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#acea792e406efe5119cec2e3e522e02c2">shaka::media::ByteQueue::Push</a></div><div class="ttdeci">void Push(const uint8_t *data, int size)</div><div class="ttdoc">Append new bytes to the end of the queue. </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00029">byte_queue.cc:29</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1ByteQueue_html_a31b30d39d14fca3ce722b4233de95c79"><div class="ttname"><a href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a31b30d39d14fca3ce722b4233de95c79">shaka::media::ByteQueue::Pop</a></div><div class="ttdeci">void Pop(int count)</div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00070">byte_queue.cc:70</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1ByteQueue_html_ab1659ef71098c37e9fb4e55ab1664e84"><div class="ttname"><a href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#ab1659ef71098c37e9fb4e55ab1664e84">shaka::media::ByteQueue::Reset</a></div><div class="ttdeci">void Reset()</div><div class="ttdoc">Reset the queue to the empty state. </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00024">byte_queue.cc:24</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1ByteQueue_html_a838fe5642e533477a5e229981e5f06e7"><div class="ttname"><a href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a838fe5642e533477a5e229981e5f06e7">shaka::media::ByteQueue::Peek</a></div><div class="ttdeci">void Peek(const uint8_t **data, int *size) const </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00063">byte_queue.cc:63</a></div></div>
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