<divclass="fragment"><divclass="line"><aname="l00001"></a><spanclass="lineno"> 1</span> <spanclass="comment">// Copyright (c) 2012 The Chromium Authors. All rights reserved.</span></div><divclass="line"><aname="l00002"></a><spanclass="lineno"> 2</span> <spanclass="comment">// Use of this source code is governed by a BSD-style license that can be</span></div><divclass="line"><aname="l00003"></a><spanclass="lineno"> 3</span> <spanclass="comment">// found in the LICENSE file.</span></div><divclass="line"><aname="l00004"></a><spanclass="lineno"> 4</span> </div><divclass="line"><aname="l00005"></a><spanclass="lineno"> 5</span> <spanclass="preprocessor">#ifndef PACKAGER_MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_</span></div><divclass="line"><aname="l00006"></a><spanclass="lineno"> 6</span> <spanclass="preprocessor">#define PACKAGER_MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_</span></div><divclass="line"><aname="l00007"></a><spanclass="lineno"> 7</span> </div><divclass="line"><aname="l00008"></a><spanclass="lineno"> 8</span> <spanclass="preprocessor">#include <stdint.h></span></div><divclass="line"><aname="l00009"></a><spanclass="lineno"> 9</span> </div><divclass="line"><aname="l00010"></a><spanclass="lineno"> 10</span> <spanclass="preprocessor">#include "packager/base/macros.h"</span></div><divclass="line"><aname="l00011"></a><spanclass="lineno"> 11</span> </div><divclass="line"><aname="l00012"></a><spanclass="lineno"> 12</span> <spanclass="keyword">namespace </span><aclass="code"href="../../d8/daf/namespaceshaka.html">shaka</a> {</div><divclass="line"><aname="l00013"></a><spanclass="lineno"> 13</span> <spanclass="keyword">namespace </span>media {</div><divclass="line"><aname="l00014"></a><spanclass="lineno"> 14</span> </div><divclass="line"><aname="l00015"></a><spanclass="lineno"> 15</span> <spanclass="comment">// Generates timestamps for a sequence of audio sample frames. This class should</span></div><divclass="line"><aname="l00016"></a><spanclass="lineno"> 16</span> <spanclass="comment">// be used any place timestamps need to be calculated for a sequence of audio</span></div><divclass="line"><aname="l00017"></a><spanclass="lineno"> 17</span> <spanclass="comment">// samples. It helps avoid timestamps inaccuracies caused by rounding/truncation</span></div><divclass="line"><aname="l00018"></a><spanclass="lineno"> 18</span> <spanclass="comment">// in repeated sample count to timestamp conversions.</span></div><divclass="line"><aname="l00019"></a><spanclass="lineno"> 19</span> <spanclass="comment">//</span></div><divclass="line"><aname="l00020"></a><spanclass="lineno"> 20</span> <spanclass="comment">// The class is constructed with samples_per_second information so that it can</span></div><divclass="line"><aname="l00021"></a><spanclass="lineno"> 21</span> <spanclass="comment">// convert audio sample frame counts into timestamps. After the object is</span></div><divclass="line"><aname="l00022"></a><spanclass="lineno"> 22</span> <spanclass="comment">// constructed, SetBaseTimestamp() must be called to specify the starting</span></div><divclass="line"><aname="l00023"></a><spanclass="lineno"> 23</span> <spanclass="comment">// timestamp of the audio sequence. As audio samples are received, their frame</span></div><divclass="line"><aname="l00024"></a><spanclass="lineno"> 24</span> <spanclass="comment">// counts are added using AddFrames(). These frame counts are accumulated by</span></div><divclass="line"><aname="l00025"></a><spanclass="lineno"> 25</span> <spanclass="comment">// this class so GetTimestamp() can be used to determine the timestamp for the</span></div><divclass="line"><aname="l00026"></a><spanclass="lineno"> 26</span> <spanclass="comment">// samples that have been added. GetDuration() calculates the proper duration</span></div><
