176 lines
16 KiB
HTML
176 lines
16 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
|
|
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
|
|
<meta name="generator" content="Doxygen 1.8.6"/>
|
|
<title>DASH Media Packaging SDK: media/base/audio_timestamp_helper.h Source File</title>
|
|
<link href="../../tabs.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="../../jquery.js"></script>
|
|
<script type="text/javascript" src="../../dynsections.js"></script>
|
|
<link href="../../search/search.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="../../search/search.js"></script>
|
|
<script type="text/javascript">
|
|
$(document).ready(function() { searchBox.OnSelectItem(0); });
|
|
</script>
|
|
<link href="../../doxygen.css" rel="stylesheet" type="text/css" />
|
|
</head>
|
|
<body>
|
|
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
|
|
<div id="titlearea">
|
|
<table cellspacing="0" cellpadding="0">
|
|
<tbody>
|
|
<tr style="height: 56px;">
|
|
<td style="padding-left: 0.5em;">
|
|
<div id="projectname">DASH Media Packaging SDK
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<!-- end header part -->
|
|
<!-- Generated by Doxygen 1.8.6 -->
|
|
<script type="text/javascript">
|
|
var searchBox = new SearchBox("searchBox", "../../search",false,'Search');
|
|
</script>
|
|
<div id="navrow1" class="tabs">
|
|
<ul class="tablist">
|
|
<li><a href="../../index.html"><span>Main Page</span></a></li>
|
|
<li><a href="../../namespaces.html"><span>Namespaces</span></a></li>
|
|
<li><a href="../../annotated.html"><span>Classes</span></a></li>
|
|
<li class="current"><a href="../../files.html"><span>Files</span></a></li>
|
|
<li>
|
|
<div id="MSearchBox" class="MSearchBoxInactive">
|
|
<span class="left">
|
|
<img id="MSearchSelect" src="../../search/mag_sel.png"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
alt=""/>
|
|
<input type="text" id="MSearchField" value="Search" accesskey="S"
|
|
onfocus="searchBox.OnSearchFieldFocus(true)"
|
|
onblur="searchBox.OnSearchFieldFocus(false)"
|
|
onkeyup="searchBox.OnSearchFieldChange(event)"/>
|
|
</span><span class="right">
|
|
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="../../search/close.png" alt=""/></a>
|
|
</span>
|
|
</div>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div id="navrow2" class="tabs2">
|
|
<ul class="tablist">
|
|
<li><a href="../../files.html"><span>File List</span></a></li>
|
|
</ul>
|
|
</div>
|
|
<!-- window showing the filter options -->
|
|
<div id="MSearchSelectWindow"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
onkeydown="return searchBox.OnSearchSelectKey(event)">
|
|
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Classes</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Namespaces</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a></div>
|
|
|
|
<!-- iframe showing the search results (closed by default) -->
|
|
<div id="MSearchResultsWindow">
|
|
<iframe src="javascript:void(0)" frameborder="0"
|
|
name="MSearchResults" id="MSearchResults">
|
|
</iframe>
|
|
</div>
|
|
|
|
<div id="nav-path" class="navpath">
|
|
<ul>
|
|
<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>
|
|
</div>
|
|
</div><!-- top -->
|
|
<div class="header">
|
|
<div class="headertitle">
|
|
<div class="title">audio_timestamp_helper.h</div> </div>
|
|
</div><!--header-->
|
|
<div class="contents">
|
|
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright (c) 2012 The Chromium Authors. All rights reserved.</span></div>
|
|
<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>
|
|
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// found in the LICENSE file.</span></div>
|
|
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div>
|
|
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#ifndef MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_</span></div>
|
|
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor"></span><span class="preprocessor">#define MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_</span></div>
|
|
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor"></span></div>
|
|
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <stdint.h></span></div>
|
|
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
|
|
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "packager/base/macros.h"</span></div>
|
|
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
|
|
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="keyword">namespace </span>shaka {</div>
|
|
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>media {</div>
|
|
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
|
|
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// Generates timestamps for a sequence of audio sample frames. This class should</span></div>
|
|
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// be used any place timestamps need to be calculated for a sequence of audio</span></div>
|
|
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// samples. It helps avoid timestamps inaccuracies caused by rounding/truncation</span></div>
|
|
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// in repeated sample count to timestamp conversions.</span></div>
|
|
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">//</span></div>
|
|
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// The class is constructed with samples_per_second information so that it can</span></div>
|
|
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// convert audio sample frame counts into timestamps. After the object is</span></div>
|
|
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// constructed, SetBaseTimestamp() must be called to specify the starting</span></div>
|
|
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// timestamp of the audio sequence. As audio samples are received, their frame</span></div>
|
|
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">// counts are added using AddFrames(). These frame counts are accumulated by</span></div>
|
|
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// this class so GetTimestamp() can be used to determine the timestamp for the</span></div>
|
|
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">// samples that have been added. GetDuration() calculates the proper duration</span></div>
|
|
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// values for samples added to the current timestamp. GetFramesToTarget()</span></div>
|
|
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// determines the number of frames that need to be added/removed from the</span></div>
|
|
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// accumulated frames to reach a target timestamp.</span></div>
|
|
<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="../../d0/d4d/classshaka_1_1media_1_1AudioTimestampHelper.html"> 30</a></span> <span class="keyword">class </span><a class="code" href="../../d0/d4d/classshaka_1_1media_1_1AudioTimestampHelper.html">AudioTimestampHelper</a> {</div>
|
|
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keyword">public</span>:</div>
|
|
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keyword">explicit</span> <a class="code" href="../../d0/d4d/classshaka_1_1media_1_1AudioTimestampHelper.html">AudioTimestampHelper</a>(uint32_t timescale,</div>
|
|
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  uint32_t samples_per_second);</div>
|
|
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
|
|
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">// Sets the base timestamp to |base_timestamp| and the sets count to 0.</span></div>
|
|
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">void</span> SetBaseTimestamp(int64_t base_timestamp);</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>  int64_t base_timestamp() <span class="keyword">const</span>;</div>
|
|
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  int64_t frame_count()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> frame_count_; }</div>
|
|
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
|
|
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// Adds |frame_count| to the frame counter.</span></div>
|
|
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// Note: SetBaseTimestamp() must be called with a value other than</span></div>
|
|
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="comment">// kNoTimestamp() before this method can be called.</span></div>
|
|
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">void</span> AddFrames(int64_t frame_count);</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>  <span class="comment">// Get the current timestamp. This value is computed from the base_timestamp()</span></div>
|
|
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// and the number of sample frames that have been added so far.</span></div>
|
|
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  int64_t GetTimestamp() <span class="keyword">const</span>;</div>
|
|
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div>
|
|
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// Gets the duration if |frame_count| frames were added to the current</span></div>
|
|
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// timestamp reported by GetTimestamp(). This method ensures that</span></div>
|
|
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// (GetTimestamp() + GetFrameDuration(n)) will equal the timestamp that</span></div>
|
|
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// GetTimestamp() will return if AddFrames(n) is called.</span></div>
|
|
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  int64_t GetFrameDuration(int64_t frame_count) <span class="keyword">const</span>;</div>
|
|
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
|
|
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="comment">// Returns the number of frames needed to reach the target timestamp.</span></div>
|
|
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// Note: |target| must be >= |base_timestamp_|.</span></div>
|
|
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  int64_t GetFramesToTarget(int64_t target) <span class="keyword">const</span>;</div>
|
|
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
|
|
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">private</span>:</div>
|
|
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  int64_t ComputeTimestamp(int64_t frame_count) <span class="keyword">const</span>;</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>  <span class="keywordtype">double</span> ticks_per_frame_;</div>
|
|
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
|
|
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  int64_t base_timestamp_;</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>  <span class="comment">// Number of frames accumulated by AddFrames() calls.</span></div>
|
|
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  int64_t frame_count_;</div>
|
|
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
|
|
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  DISALLOW_IMPLICIT_CONSTRUCTORS(<a class="code" href="../../d0/d4d/classshaka_1_1media_1_1AudioTimestampHelper.html">AudioTimestampHelper</a>);</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> </div>
|
|
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> } <span class="comment">// namespace media</span></div>
|
|
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> } <span class="comment">// namespace shaka</span></div>
|
|
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> </div>
|
|
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="preprocessor">#endif</span></div>
|
|
<div class="ttc" id="classshaka_1_1media_1_1AudioTimestampHelper_html"><div class="ttname"><a href="../../d0/d4d/classshaka_1_1media_1_1AudioTimestampHelper.html">shaka::media::AudioTimestampHelper</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dd/d9a/audio__timestamp__helper_8h_source.html#l00030">audio_timestamp_helper.h:30</a></div></div>
|
|
</div><!-- fragment --></div><!-- contents -->
|
|
<!-- start footer part -->
|
|
<hr class="footer"/><address class="footer"><small>
|
|
Generated on Thu Mar 30 2017 22:34:02 for DASH Media Packaging SDK by  <a href="http://www.doxygen.org/index.html">
|
|
<img class="footer" src="../../doxygen.png" alt="doxygen"/>
|
|
</a> 1.8.6
|
|
</small></address>
|
|
</body>
|
|
</html>
|