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Snowboy Demo on Android

Note:

  1. supported building platforms are Android Studio running on Mac OS X or Ubuntu. Windows is not supported.
  2. supported target CPU is ARMv7 (32bit) and ARMv8 (64bit) (most Android phones run on ARM CPUs)
  3. we have prepared an Android app which can be installed and run out of box: SnowboyAlexaDemo.apk (please uninstall any previous one first if you installed this app before).

General Workflow

  1. Install swig. For Mac, do brew install swig; for Ubuntu, do sudo apt-get install swig3.0. Make sure your swig version is at least 3.0.10. You'll also need wget to download files.

  2. Go to swig/Android and build swig wrappers for Snowboy:

     cd swig/Android
 make

    To make for ARMv8 64bit:

      make BIT=64

    Ths will generate a cross-compiled library for ARM:

     jniLibs/
 	├── arm64-v8a
 	│   └── libsnowboy-detect-android.so
 	└── armeabi-v7a
 	    └── libsnowboy-detect-android.so

    and a few Java wrapper files:

     java
 └── ai
     └── kitt
 	└── snowboy
             ├── SnowboyDetect.java
             ├── snowboy.java
             └── snowboyJNI.java

    The generated .so and .java files are hyperlinked to the examples/Android/SnowboyAlexaDemo folder.

  3. Use Android Studio to open the project in examples/Android/SnowboyAlexaDemo and run it.

Screenshot (say "Alexa" after clicking "Start"):

Android Alexa Demo

Don't forget to disable the "debug" option when releasing your Android App!

Note: If you need to copy the Android demo to another folder, please use the -RL option of cp to replace the relative symbol links with real files:

cp -RL  SnowboyAlexaDemo Other_Folder

Note: The sample app will save/overwrite all audio to a file (recording.pcm). Make sure you do not leave it on for a long time.

Useful Code Snippets

To initialize Snowboy detector in Java:

# Assume you put the model related files under /sdcard/snowboy/
SnowboyDetect snowboyDetector = new SnowboyDetect("/sdcard/snowboy/common.res",
                                                  "/sdcard/snowboy/snowboy.umdl");
snowboyDetector.SetSensitivity("0.45");         // Sensitivity for each hotword
snowboyDetector.SetAudioGain(2.0);              // Audio gain for detection

To run hotword detection in Java:

int result = snowboyDetector.RunDetection(buffer, buffer.length);   // buffer is a short array.

You may want to play with the frequency of the calls to RunDetection(), which controls the CPU usage and the detection latency.

Common Asks

The following issues have been fixed pushed to master.

  • softfloating point support with OpenBlas
  • upgrade NDK version to newer than r11c
  • NDK toolchain building: remove --stl=libc++ option