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<div id="projectname">Oboe
&#160;<span id="projectnumber">1.2</span>
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<div id="projectbrief">A library for creating real-time audio apps on Android</div>
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<li class="navelem"><a class="el" href="dir_d44c64559bbebec7f509842c48db8b23.html">include</a></li><li class="navelem"><a class="el" href="dir_768f6301d9838e45d679001914ab2803.html">oboe</a></li> </ul>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Copyright 2017 The Android Open Source Project</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * You may obtain a copy of the License at</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> *</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * limitations under the License.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> */</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#ifndef OBOE_LATENCY_TUNER_</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor">#define OBOE_LATENCY_TUNER_</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#include &lt;atomic&gt;</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor">#include &lt;cstdint&gt;</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="preprocessor">#include &quot;oboe/Definitions.h&quot;</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#include &quot;oboe/AudioStream.h&quot;</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceoboe.html">oboe</a> {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;</div><div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="classoboe_1_1_latency_tuner.html"> 41</a></span>&#160;<span class="keyword">class </span><a class="code" href="classoboe_1_1_latency_tuner.html">LatencyTuner</a> {</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keyword">explicit</span> <a class="code" href="classoboe_1_1_latency_tuner.html#a0263b9a55825c0a403653b2b508073ea">LatencyTuner</a>(<a class="code" href="classoboe_1_1_audio_stream.html">AudioStream</a> &amp;stream);</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keyword">explicit</span> <a class="code" href="classoboe_1_1_latency_tuner.html#a0263b9a55825c0a403653b2b508073ea">LatencyTuner</a>(<a class="code" href="classoboe_1_1_audio_stream.html">AudioStream</a> &amp;stream, int32_t maximumBufferSize);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <a class="code" href="namespaceoboe.html#a486512e787b609c80ba4436f23929af1">Result</a> <a class="code" href="classoboe_1_1_latency_tuner.html#ad2be756965e6a9af3114008eda892174">tune</a>();</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keywordtype">void</span> <a class="code" href="classoboe_1_1_latency_tuner.html#a6c0142e08dc65eda8f758b4794450867">requestReset</a>();</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="classoboe_1_1_latency_tuner.html#a45c013fd6787ad09d328385d6314c4d4">isAtMaximumBufferSize</a>();</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keywordtype">void</span> reset();</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keyword">enum class</span> State {</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; Idle,</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; Active,</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; AtMax,</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; Unsupported</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; } ;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="comment">// arbitrary number of calls to wait before bumping up the latency</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="keyword">static</span> constexpr int32_t kIdleCount = 8;</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160;</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <a class="code" href="classoboe_1_1_audio_stream.html">AudioStream</a> &amp;mStream;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; State mState = State::Idle;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; int32_t mMaxBufferSize = 0;</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; int32_t mPreviousXRuns = 0;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; int32_t mIdleCountDown = 0;</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; std::atomic&lt;int32_t&gt; mLatencyTriggerRequests{0}; <span class="comment">// TODO user atomic requester from AAudio</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; std::atomic&lt;int32_t&gt; mLatencyTriggerResponses{0};</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;};</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;} <span class="comment">// namespace oboe</span></div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;<span class="preprocessor">#endif // OBOE_LATENCY_TUNER_</span></div><div class="ttc" id="classoboe_1_1_latency_tuner_html_a6c0142e08dc65eda8f758b4794450867"><div class="ttname"><a href="classoboe_1_1_latency_tuner.html#a6c0142e08dc65eda8f758b4794450867">oboe::LatencyTuner::requestReset</a></div><div class="ttdeci">void requestReset()</div></div>
<div class="ttc" id="classoboe_1_1_audio_stream_html"><div class="ttname"><a href="classoboe_1_1_audio_stream.html">oboe::AudioStream</a></div><div class="ttdef"><b>Definition:</b> AudioStream.h:44</div></div>
<div class="ttc" id="classoboe_1_1_latency_tuner_html_a45c013fd6787ad09d328385d6314c4d4"><div class="ttname"><a href="classoboe_1_1_latency_tuner.html#a45c013fd6787ad09d328385d6314c4d4">oboe::LatencyTuner::isAtMaximumBufferSize</a></div><div class="ttdeci">bool isAtMaximumBufferSize()</div></div>
<div class="ttc" id="classoboe_1_1_latency_tuner_html_a0263b9a55825c0a403653b2b508073ea"><div class="ttname"><a href="classoboe_1_1_latency_tuner.html#a0263b9a55825c0a403653b2b508073ea">oboe::LatencyTuner::LatencyTuner</a></div><div class="ttdeci">LatencyTuner(AudioStream &amp;stream)</div></div>
<div class="ttc" id="classoboe_1_1_latency_tuner_html_ad2be756965e6a9af3114008eda892174"><div class="ttname"><a href="classoboe_1_1_latency_tuner.html#ad2be756965e6a9af3114008eda892174">oboe::LatencyTuner::tune</a></div><div class="ttdeci">Result tune()</div></div>
<div class="ttc" id="namespaceoboe_html_a486512e787b609c80ba4436f23929af1"><div class="ttname"><a href="namespaceoboe.html#a486512e787b609c80ba4436f23929af1">oboe::Result</a></div><div class="ttdeci">Result</div><div class="ttdef"><b>Definition:</b> Definitions.h:131</div></div>
<div class="ttc" id="classoboe_1_1_latency_tuner_html"><div class="ttname"><a href="classoboe_1_1_latency_tuner.html">oboe::LatencyTuner</a></div><div class="ttdef"><b>Definition:</b> LatencyTuner.h:41</div></div>
<div class="ttc" id="namespaceoboe_html"><div class="ttname"><a href="namespaceoboe.html">oboe</a></div><div class="ttdef"><b>Definition:</b> AudioStream.h:31</div></div>
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