Node.js package (#260)

* npm : preparing infra for node package

* npm : package infra ready

* npm : initial version ready

* npm : change name to whisper.cpp

whisper.js is taken

tests/CMakeLists.txt

@@ -1,4 +1,14 @@
 if (EMSCRIPTEN)
+    #
+    # test-whisper-js
+
+    set(TEST_TARGET test-whisper-js)
+
+    add_test(NAME ${TEST_TARGET}
+        COMMAND node test-whisper.js --experimental-wasm-threads
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        )
+
     return()
 endif()
 

tests/test-whisper.js

@@ -0,0 +1,58 @@
+var factory = require('../bindings/javascript/whisper.js')
+
+factory().then(function(whisper) {
+    var fs = require('fs');
+
+    // to avoid reading WAV files and depending on some 3rd-party package, we read
+    // 32-bit float PCM directly. to genereate it:
+    //
+    //   $ ffmpeg -i samples/jfk.wav -f f32le -acodec pcm_f32le samples/jfk.pcmf32
+    //
+    let fname_wav   = "../samples/jfk.pcmf32";
+    let fname_model = "../models/ggml-base.en.bin";
+
+    // init whisper
+    {
+        // read binary data from file
+        var model_data = fs.readFileSync(fname_model);
+        if (model_data == null) {
+            console.log("whisper: failed to read model file");
+            process.exit(1);
+        }
+
+        // write binary data to WASM memory
+        whisper.FS_createDataFile("/", "whisper.bin", model_data, true, true);
+
+        // init the model
+        var ret = whisper.init("whisper.bin");
+        if (ret == false) {
+            console.log('whisper: failed to init');
+            process.exit(1);
+        }
+    }
+
+    // transcribe wav file
+    {
+        // read raw binary data
+        var pcm_data = fs.readFileSync(fname_wav);
+        if (pcm_data == null) {
+            console.log("whisper: failed to read wav file");
+            process.exit(1);
+        }
+
+        // convert to 32-bit float array
+        var pcm = new Float32Array(pcm_data.buffer);
+
+        // transcribe
+        var ret = whisper.full_default(pcm, "en", false);
+        if (ret != 0) {
+            console.log("whisper: failed to transcribe");
+            process.exit(1);
+        }
+    }
+
+    // free memory
+    {
+        whisper.free();
+    }
+});