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<h1 id="api-sample-v1-api">API Sample (V1 API)</h1>
<hr />
<p>The following code demonstrates the general operation of the Wake Word Engine using the V1 API.</p>
<div class="highlight"><pre><span></span><code><span class="c1">///////////////////////////////////////////////////////////////////////////</span>
<span class="c1">// Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.</span>
<span class="c1">///////////////////////////////////////////////////////////////////////////</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><string.h></span><span class="cp"></span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span><span class="cp"></span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdlib.h></span><span class="cp"></span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">"pryon_lite.h"</span><span class="cp"></span>
<span class="cp">#define SAMPLES_PER_FRAME (160)</span>
<span class="c1">// global flag to stop processing, set by application</span>
<span class="k">static</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">quit</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"></span>
<span class="c1">// decoder handle</span>
<span class="k">static</span><span class="w"> </span><span class="n">PryonLiteDecoderHandle</span><span class="w"> </span><span class="n">sDecoder</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">NULL</span><span class="p">;</span><span class="w"></span>
<span class="c1">// binary model buffer, allocated by application</span>
<span class="c1">// this buffer can be read-only memory as PryonLite will not modify the contents</span>
<span class="cp">#define ALIGN(n) __attribute__((aligned(n)))</span>
<span class="n">ALIGN</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span><span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">modelBuffer</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">};</span><span class="w"> </span><span class="c1">// should be an array large enough to hold the largest model</span>
<span class="k">static</span><span class="w"> </span><span class="kt">char</span><span class="o">*</span><span class="w"> </span><span class="n">decoderBuffer</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="p">};</span><span class="w"> </span><span class="c1">// should be an array large enough to hold the largest decoder</span>
<span class="c1">//---- Application functions to be implemented by the client -------------------</span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">loadModel</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">**</span><span class="n">model</span><span class="p">,</span><span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="o">*</span><span class="n">sizeofModel</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="c1">// In order to detect keywords, the decoder uses a model which defines the parameters,</span>
<span class="w"> </span><span class="c1">// neural network weights, classifiers, etc that are used at runtime to process the audio</span>
<span class="w"> </span><span class="c1">// and give detection results.</span>
<span class="w"> </span><span class="c1">// Each model is packaged in two formats:</span>
<span class="w"> </span><span class="c1">// 1. A .bin file that can be loaded from disk (via fopen, fread, etc)</span>
<span class="w"> </span><span class="c1">// *sizeofModel will be the size of the binary model byte array</span>
<span class="w"> </span><span class="c1">// *model will be a pointer to the model read into memory</span>
<span class="w"> </span><span class="c1">//</span>
<span class="w"> </span><span class="c1">// 2. A .cpp file that can be hard-coded at compile time</span>
<span class="w"> </span><span class="c1">// *sizeofModel will be prlBinaryModelLen</span>
<span class="w"> </span><span class="c1">// *model will be prlBinaryModelData</span>
<span class="w"> </span><span class="o">*</span><span class="n">sizeofModel</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"> </span><span class="c1">// example value, will be the size of the binary model byte array</span>
<span class="w"> </span><span class="o">*</span><span class="n">model</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">modelBuffer</span><span class="p">;</span><span class="w"> </span><span class="c1">// pointer to model in memory</span>
<span class="p">}</span><span class="w"></span>
<span class="c1">// client implemented function to read audio samples</span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">readAudio</span><span class="p">(</span><span class="kt">short</span><span class="o">*</span><span class="w"> </span><span class="n">samples</span><span class="p">,</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">sampleCount</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="c1">// todo - read samples from file, audio system, etc.</span>
<span class="p">}</span><span class="w"></span>
<span class="c1">//---- Decoder callback functions to be implemented by the client --------------</span>
<span class="c1">///</span>
<span class="c1">/// @brief Callback function triggered by the decoder when a wake word is detected.</span>
<span class="c1">///</span>
<span class="c1">/// @param handle [in] Handle for the decoder which detected the wake word</span>
<span class="c1">/// @param result [in] Result structure indicating which information about the wake word detection</span>
<span class="c1">/// See pryon_lite_ww.h for a full description of this structure</span>
<span class="c1">///</span>
<span class="c1">/// @return void</span>
<span class="c1">///</span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">detectionCallback</span><span class="p">(</span><span class="n">PryonLiteDecoderHandle</span><span class="w"> </span><span class="n">handle</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">PryonLiteResult</span><span class="o">*</span><span class="w"> </span><span class="n">result</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"Detected keyword '%s'"</span><span class="p">,</span><span class="w"> </span><span class="n">result</span><span class="o">-></span><span class="n">keyword</span><span class="p">);</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
<span class="c1">///</span>
<span class="c1">/// @brief Callback function triggered by the decoder when a VAD state transition is detected.</span>
<span class="c1">///</span>
<span class="c1">/// @param handle [in] Handle for the decoder which detected the VAD state transition</span>
<span class="c1">/// @param vadEvent [in] Result structure indicating the current VAD state</span>
<span class="c1">///</span>
<span class="c1">/// @return void</span>
<span class="c1">///</span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">vadCallback</span><span class="p">(</span><span class="n">PryonLiteDecoderHandle</span><span class="w"> </span><span class="n">handle</span><span class="p">,</span><span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">PryonLiteVadEvent</span><span class="o">*</span><span class="w"> </span><span class="n">vadEvent</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">printf</span><span class="p">(</span><span class="s">"VAD state %d</span>
<span class="s">", (int) vadEvent->vadState);</span>
<span class="p">}</span><span class="w"></span>
<span class="c1">//---- Main processing loop ----------------------------------------------------</span>
<span class="c1">// The main loop below shows the full life cycle of the wake word engine. This</span>
<span class="c1">// life cycle is broken down into 3 phases.</span>
<span class="c1">//</span>
<span class="c1">// Phase 1 - Initialization</span>
<span class="c1">// STEP 1.1 - Load the model</span>
<span class="c1">// STEP 1.2 - Query for the size of instance memory required by the decoder</span>
<span class="c1">// STEP 1.3 - Allocate/Check decoder buffer</span>
<span class="c1">// STEP 1.4 - Configure Decoder</span>
<span class="c1">// STEP 1.5 - Initialize Decoder</span>
<span class="c1">// STEP 1.6 - Optional - Runtime configuration functions</span>
<span class="c1">// Phase 2 - Audio Processing</span>
<span class="c1">// STEP 2.1 - Gather audio</span>
<span class="c1">// STEP 2.2 - Push audio to Decoder</span>
<span class="c1">// STEP 2.3 - Handle Decoder events</span>
<span class="c1">// Phase 3 - Cleanup</span>
<span class="c1">//</span>
<span class="c1">// The sample below is for a single locale/model. To change the locale/model</span>
<span class="c1">// being used, complete Phase 3 - Cleanup for the engine instance and then</span>
<span class="c1">// create a new instance by going back through Phase 1 - Initialization with</span>
<span class="c1">// the new model.</span>
<span class="kt">int</span><span class="w"> </span><span class="n">main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">**</span><span class="n">argv</span><span class="p">)</span><span class="w"></span>
<span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Start Phase 1 - Initialization</span>
<span class="w"> </span><span class="c1">//</span>
<span class="w"> </span><span class="c1">// The initialization phase begins with nothing and ends with a fully</span>
<span class="w"> </span><span class="c1">// initialized instance of the wake word engine.</span>
<span class="w"> </span><span class="c1">//</span>
<span class="w"> </span><span class="c1">// STEP 1.1 - Load the model</span>
<span class="w"> </span><span class="c1">// This step covers loading the model data from source. Models are</span>
<span class="w"> </span><span class="c1">// delivered in two different forms, a C file with an array</span>
<span class="w"> </span><span class="c1">// containing the model source or a separate bin file. If using</span>
<span class="w"> </span><span class="c1">// the C file, the model source and size are already defined. If</span>
<span class="w"> </span><span class="c1">// using the bin file, the model source needs to be read into an</span>
<span class="w"> </span><span class="c1">// array and the length needs to be calculated.</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="n">model</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="kt">size_t</span><span class="w"> </span><span class="n">sizeofModel</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">loadModel</span><span class="p">(</span><span class="o">&</span><span class="n">model</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">sizeofModel</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="c1">// STEP 1.2 - Query for the size of instance memory required by the decoder</span>
<span class="w"> </span><span class="c1">// The wake word engine initialization requires a buffer be passed</span>
<span class="w"> </span><span class="c1">// in which is owned by the application layer. The size of this</span>
<span class="w"> </span><span class="c1">// buffer is dynamic depending on the model being used. Use the</span>
<span class="w"> </span><span class="c1">// PryonLite_GetModelAttributes function below to determine the</span>
<span class="w"> </span><span class="c1">// size of the decoder buffer needed.</span>
<span class="w"> </span><span class="n">PryonLiteModelAttributes</span><span class="w"> </span><span class="n">modelAttributes</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">PryonLiteError</span><span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">PryonLite_GetModelAttributes</span><span class="p">(</span><span class="n">model</span><span class="p">,</span><span class="w"> </span><span class="n">sizeofModel</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">modelAttributes</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">status</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">PRYON_LITE_ERROR_OK</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="c1">// STEP 1.3 - Allocate/Check decoder buffer</span>
<span class="w"> </span><span class="c1">// Once the size of the decoder buffer has been determined, the</span>
<span class="w"> </span><span class="c1">// application layer must create the buffer. This example uses</span>
<span class="w"> </span><span class="c1">// a statically defined buffer. If applicable to the device,</span>
<span class="w"> </span><span class="c1">// this buffer can be dynamically allocated as well. The</span>
<span class="w"> </span><span class="c1">// requirement is that a buffer that is at least</span>
<span class="w"> </span><span class="c1">// modelAttributes.requiredDecoderMem size, in bytes, is created.</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">modelAttributes</span><span class="p">.</span><span class="n">requiredDecoderMem</span><span class="w"> </span><span class="o">></span><span class="w"> </span><span class="k">sizeof</span><span class="p">(</span><span class="n">decoderBuffer</span><span class="p">))</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="c1">// handle error</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="c1">// STEP 1.4 - Configure Decoder</span>
<span class="w"> </span><span class="c1">// PryonLiteDecoderConfig is used to configure the wake word engine.</span>
<span class="w"> </span><span class="c1">// Use PryonLiteDecodeConfig_Default to set up this structure with</span>
<span class="w"> </span><span class="c1">// default values. There are required fields which must be set</span>
<span class="w"> </span><span class="c1">// after the default values, see the example below.</span>
<span class="w"> </span><span class="n">PryonLiteDecoderConfig</span><span class="w"> </span><span class="n">config</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">PryonLiteDecoderConfig_Default</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Required fields: model, sizeofModel loaded in STEP 1</span>
<span class="w"> </span><span class="n">config</span><span class="p">.</span><span class="n">model</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">model</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">config</span><span class="p">.</span><span class="n">sizeofModel</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">sizeofModel</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Required fields: decoderMem, sizeofDecoderMem created in STEP 3</span>
<span class="w"> </span><span class="n">config</span><span class="p">.</span><span class="n">decoderMem</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">decoderBuffer</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">config</span><span class="p">.</span><span class="n">sizeofDecoderMem</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">modelAttributes</span><span class="p">.</span><span class="n">requiredDecoderMem</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Required field: resultCallback, callback function which handles wake word detections</span>
<span class="w"> </span><span class="n">config</span><span class="p">.</span><span class="n">resultCallback</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">detectionCallback</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Optional fields: VAD Configuration</span>
<span class="w"> </span><span class="c1">// Enabling will use VAD in the wake word engine. If the</span>
<span class="w"> </span><span class="c1">// vadCallback is configured, it will be called whenever</span>
<span class="w"> </span><span class="c1">// there is a VAD state transition identified.</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">enableVad</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="c1">// disable voice activity detector, set to 1 to enable</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">enableVad</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="n">config</span><span class="p">.</span><span class="n">vadCallback</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">vadCallback</span><span class="p">;</span><span class="w"> </span><span class="c1">// register VAD handler</span>
<span class="w"> </span><span class="c1">// this parameter is optional,</span>
<span class="w"> </span><span class="c1">// and may be set to NULL when VAD is enabled</span>
<span class="w"> </span><span class="n">config</span><span class="p">.</span><span class="n">useVad</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"> </span><span class="c1">// enable voice activity detector</span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="c1">// STEP 1.5 - Initialize Decoder</span>
<span class="w"> </span><span class="c1">// Pass the configuration from STEP 4 to PryonLiteDecoder_Initialize</span>
<span class="w"> </span><span class="c1">// to create an instance of the wake word engine. After this function</span>
<span class="w"> </span><span class="c1">// is called, the decoder instance pointed to by sDecoder is fully</span>
<span class="w"> </span><span class="c1">// functional.</span>
<span class="w"> </span><span class="n">PryonLiteSessionInfo</span><span class="w"> </span><span class="n">sessionInfo</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">PryonLiteDecoder_Initialize</span><span class="p">(</span><span class="o">&</span><span class="n">config</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">sessionInfo</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">sDecoder</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">status</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">PRYON_LITE_ERROR_OK</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="c1">// STEP 1.6 - Optional - Runtime configuration functions</span>
<span class="w"> </span><span class="c1">// The optional functions below allow for the runtime overrides of</span>
<span class="w"> </span><span class="c1">// configuration options. These functions can be called on a decoder</span>
<span class="w"> </span><span class="c1">// instance any time after a successful PryonLiteDecoder_Initialize</span>
<span class="w"> </span><span class="c1">// and before PryonLiteDecoder_Destroy.</span>
<span class="w"> </span><span class="c1">// Set detection threshold for all keywords</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">detectionThreshold</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">500</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">PryonLiteDecoder_SetDetectionThreshold</span><span class="p">(</span><span class="n">sDecoder</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">,</span><span class="w"> </span><span class="n">detectionThreshold</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">status</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">PRYON_LITE_ERROR_OK</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="c1">// End Phase 1 - Initialization</span>
<span class="w"> </span><span class="c1">// allocate buffer to hold audio samples</span>
<span class="w"> </span><span class="kt">short</span><span class="w"> </span><span class="n">samples</span><span class="p">[</span><span class="n">SAMPLES_PER_FRAME</span><span class="p">];</span><span class="w"></span>
<span class="w"> </span><span class="c1">// run decoder</span>
<span class="w"> </span><span class="k">while</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Start Phase 2 - Audio Processing</span>
<span class="w"> </span><span class="c1">//</span>
<span class="w"> </span><span class="c1">// The audio processing phase is where audio is pushed into an initialized</span>
<span class="w"> </span><span class="c1">// decoder instance and decoder events are handled.</span>
<span class="w"> </span><span class="c1">//</span>
<span class="w"> </span><span class="c1">// STEP 2.1 - Gather audio</span>
<span class="w"> </span><span class="c1">// Audio must be gathered into frames of length</span>
<span class="w"> </span><span class="c1">// sessionInfo.samplesPerFrame before sending to the decoder.</span>
<span class="w"> </span><span class="n">readAudio</span><span class="p">(</span><span class="n">samples</span><span class="p">,</span><span class="w"> </span><span class="n">sessionInfo</span><span class="p">.</span><span class="n">samplesPerFrame</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="c1">// STEP 2.2 - Push audio to Decoder</span>
<span class="w"> </span><span class="c1">// Once an appropriate amount of audio has been gathered, push</span>
<span class="w"> </span><span class="c1">// the frame into the decoder using the PushAudioSamples. This</span>
<span class="w"> </span><span class="c1">// tells the decoder to process the audio and trigger any</span>
<span class="w"> </span><span class="c1">// generated events through the callback functions.</span>
<span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">PryonLiteDecoder_PushAudioSamples</span><span class="p">(</span><span class="n">sDecoder</span><span class="p">,</span><span class="w"> </span><span class="n">samples</span><span class="p">,</span><span class="w"> </span><span class="n">sessionInfo</span><span class="p">.</span><span class="n">samplesPerFrame</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">status</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">PRYON_LITE_ERROR_OK</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="c1">// handle error</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="c1">// STEP 2.3 - Handle Decoder events</span>
<span class="w"> </span><span class="c1">// The decoder passes back event information to the application</span>
<span class="w"> </span><span class="c1">// layer through the callback functions configured in Phase 1.</span>
<span class="w"> </span><span class="c1">// Different event types trigger different callback functions.</span>
<span class="w"> </span><span class="c1">// This sample supports two different events, see the callback</span>
<span class="w"> </span><span class="c1">// function documnentation for more information.</span>
<span class="w"> </span><span class="c1">// Event | Callback</span>
<span class="w"> </span><span class="c1">// Wake Word Detection | detectionCallback</span>
<span class="w"> </span><span class="c1">// VAD State Change | vadCallback</span>
<span class="w"> </span><span class="c1">//</span>
<span class="w"> </span><span class="c1">// End Phase 2 - Audio Processing</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">quit</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="c1">// Start Phase 3 - Cleanup</span>
<span class="w"> </span><span class="c1">//</span>
<span class="w"> </span><span class="c1">// Cleanup should only be run when there is no more use for the</span>
<span class="w"> </span><span class="c1">// decoder. This will flush any unprocessed audio that has been</span>
<span class="w"> </span><span class="c1">// pushed and destroy the decoder instance.</span>
<span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">PryonLiteDecoder_Destroy</span><span class="p">(</span><span class="o">&</span><span class="n">sDecoder</span><span class="p">);</span><span class="w"></span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">status</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="n">PRYON_LITE_ERROR_OK</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="c1">// handle error</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="k">break</span><span class="p">;</span><span class="w"></span>
<span class="w"> </span><span class="c1">// End Phase 3 - Cleanup</span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
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