JavaScript API with WebAssembly for speaker diarization (#1414)

#1408 uses [node-addon-api](https://github.com/nodejs/node-addon-api) to call C API from JavaScript, whereas this pull request uses WebAssembly to call C API from JavaScript.

@@ -9,6 +9,18 @@ git status
 ls -lh
 ls -lh node_modules
 
+echo '-----speaker diarization----------'
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-segmentation-models/sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+tar xvf sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+rm sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-recongition-models/3dspeaker_speech_eres2net_base_sv_zh-cn_3dspeaker_16k.onnx
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-segmentation-models/0-four-speakers-zh.wav
+
+node ./test-offline-speaker-diarization.js
+rm -rfv *.wav *.onnx sherpa-onnx-pyannote-*
+
 echo '-----vad+whisper----------'
 
 curl -LS -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-whisper-tiny.en.tar.bz2

@@ -139,7 +139,7 @@ jobs:
           export PATH=/c/hostedtoolcache/windows/Python/3.9.13/x64/bin:$PATH
           export PATH=/c/hostedtoolcache/windows/Python/3.10.11/x64/bin:$PATH
           export PATH=/c/hostedtoolcache/windows/Python/3.11.9/x64/bin:$PATH
-          export PATH=/c/hostedtoolcache/windows/Python/3.12.6/x64/bin:$PATH
+          export PATH=/c/hostedtoolcache/windows/Python/3.12.7/x64/bin:$PATH
 
           which sherpa-onnx
           sherpa-onnx --help

@@ -104,7 +104,7 @@ jobs:
           export PATH=/c/hostedtoolcache/windows/Python/3.9.13/x64/bin:$PATH
           export PATH=/c/hostedtoolcache/windows/Python/3.10.11/x64/bin:$PATH
           export PATH=/c/hostedtoolcache/windows/Python/3.11.9/x64/bin:$PATH
-          export PATH=/c/hostedtoolcache/windows/Python/3.12.6/x64/bin:$PATH
+          export PATH=/c/hostedtoolcache/windows/Python/3.12.7/x64/bin:$PATH
 
           sherpa-onnx --help
           sherpa-onnx-keyword-spotter --help

@@ -22,6 +22,22 @@ In the following, we describe how to use [sherpa-onnx](https://github.com/k2-fsa
 for text-to-speech and speech-to-text.
 
 
+# Speaker diarization
+
+In the following, we demonstrate how to run speaker diarization.
+
+```bash
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-segmentation-models/sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+tar xvf sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+rm sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-recongition-models/3dspeaker_speech_eres2net_base_sv_zh-cn_3dspeaker_16k.onnx
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-segmentation-models/0-four-speakers-zh.wav
+
+node ./test-offline-speaker-diarization.js
+```
+
 # Text-to-speech
 
 In the following, we demonstrate how to run text-to-speech.

+// Copyright (c)  2024  Xiaomi Corporation
+const sherpa_onnx = require('sherpa-onnx');
+
+// clang-format off
+/* Please use the following commands to download files
+   used in this script
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-segmentation-models/sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+tar xvf sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+rm sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-recongition-models/3dspeaker_speech_eres2net_base_sv_zh-cn_3dspeaker_16k.onnx
+
+curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-segmentation-models/0-four-speakers-zh.wav
+
+ */
+// clang-format on
+
+const config = {
+  segmentation: {
+    pyannote: {
+      model: './sherpa-onnx-pyannote-segmentation-3-0/model.onnx',
+      debug: 1,
+    },
+  },
+  embedding: {
+    model: './3dspeaker_speech_eres2net_base_sv_zh-cn_3dspeaker_16k.onnx',
+    debug: 1,
+  },
+  clustering: {
+    // since we know that the test wave file
+    // ./0-four-speakers-zh.wav contains 4 speakers, we use 4 for numClusters
+    // here. if you don't have such information, please set numClusters to -1
+    numClusters: 4,
+
+    // If numClusters is not -1, then threshold is ignored.
+    //
+    // A larger threshold leads to fewer clusters, i.e., fewer speakers
+    // A smaller threshold leads to more clusters, i.e., more speakers
+    // You need to tune it by yourself.
+    threshold: 0.5,
+  },
+
+  // If a segment is shorter than minDurationOn, we discard it
+  minDurationOn: 0.2,  // in seconds
+
+  // If the gap between two segments is less than minDurationOff, then we
+  // merge these two segments into a single one
+  minDurationOff: 0.5,  // in seconds
+};
+
+const waveFilename = './0-four-speakers-zh.wav';
+
+const sd = sherpa_onnx.createOfflineSpeakerDiarization(config);
+console.log('Started')
+
+const wave = sherpa_onnx.readWave(waveFilename);
+if (sd.sampleRate != wave.sampleRate) {
+  throw new Error(
+      `Expected sample rate: ${sd.sampleRate}, given: ${wave.sampleRate}`);
+}
+
+const segments = sd.process(wave.samples);
+console.log(segments);

@@ -7,6 +7,8 @@ const sherpa_onnx_tts = require('./sherpa-onnx-tts.js');
 const sherpa_onnx_kws = require('./sherpa-onnx-kws.js');
 const sherpa_onnx_wave = require('./sherpa-onnx-wave.js');
 const sherpa_onnx_vad = require('./sherpa-onnx-vad.js');
+const sherpa_onnx_speaker_diarization =
+    require('./sherpa-onnx-speaker-diarization.js');
 
 function createOnlineRecognizer(config) {
   return sherpa_onnx_asr.createOnlineRecognizer(wasmModule, config);
@@ -32,6 +34,11 @@ function createVad(config) {
   return sherpa_onnx_vad.createVad(wasmModule, config);
 }
 
+function createOfflineSpeakerDiarization(config) {
+  return sherpa_onnx_speaker_diarization.createOfflineSpeakerDiarization(
+      wasmModule, config);
+}
+
 function readWave(filename) {
   return sherpa_onnx_wave.readWave(filename, wasmModule);
 }
@@ -51,4 +58,5 @@ module.exports = {
   writeWave,
   createCircularBuffer,
   createVad,
+  createOfflineSpeakerDiarization,
 };

@@ -70,6 +70,17 @@ set(exported_functions
   SherpaOnnxDestroySpeechSegment
   SherpaOnnxVoiceActivityDetectorReset
   SherpaOnnxVoiceActivityDetectorFlush
+  # Speaker diarization
+  SherpaOnnxCreateOfflineSpeakerDiarization
+  SherpaOnnxDestroyOfflineSpeakerDiarization
+  SherpaOnnxOfflineSpeakerDiarizationDestroyResult
+  SherpaOnnxOfflineSpeakerDiarizationDestroySegment
+  SherpaOnnxOfflineSpeakerDiarizationGetSampleRate
+  SherpaOnnxOfflineSpeakerDiarizationProcess
+  SherpaOnnxOfflineSpeakerDiarizationProcessWithCallback
+  SherpaOnnxOfflineSpeakerDiarizationResultGetNumSegments
+  SherpaOnnxOfflineSpeakerDiarizationResultSortByStartTime
+  SherpaOnnxOfflineSpeakerDiarizationSetConfig
   #
   SherpaOnnxFileExists
   SherpaOnnxReadWave
@@ -109,6 +120,7 @@ install(
   ${CMAKE_SOURCE_DIR}/wasm/tts/sherpa-onnx-tts.js
   ${CMAKE_SOURCE_DIR}/wasm/kws/sherpa-onnx-kws.js
   ${CMAKE_SOURCE_DIR}/wasm/vad/sherpa-onnx-vad.js
+  ${CMAKE_SOURCE_DIR}/wasm/speaker-diarization/sherpa-onnx-speaker-diarization.js
   ${CMAKE_SOURCE_DIR}/wasm/nodejs/sherpa-onnx-wave.js
     "$<TARGET_FILE_DIR:sherpa-onnx-wasm-nodejs>/sherpa-onnx-wasm-nodejs.js"
     "$<TARGET_FILE_DIR:sherpa-onnx-wasm-nodejs>/sherpa-onnx-wasm-nodejs.wasm"

@@ -12,7 +12,6 @@ Remember to rename the downloaded files.
 
 The following is an example.
 
-
 ```bash
 cd wasm/speaker-diarization/assets/
 
@@ -22,9 +21,6 @@ rm sherpa-onnx-pyannote-segmentation-3-0.tar.bz2
 cp sherpa-onnx-pyannote-segmentation-3-0/model.onnx ./segmentation.onnx
 rm -rf sherpa-onnx-pyannote-segmentation-3-0
 
-
 curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-recongition-models/3dspeaker_speech_eres2net_base_sv_zh-cn_3dspeaker_16k.onnx
 mv 3dspeaker_speech_eres2net_base_sv_zh-cn_3dspeaker_16k.onnx ./embedding.onnx
-
-
 ```

@@ -64,7 +64,7 @@ function initSherpaOnnxOfflineSpeakerSegmentationModelConfig(config, Module) {
   Module.setValue(ptr + offset, config.numThreads || 1, 'i32');
   offset += 4;
 
-  Module.setValue(ptr + offset, config.debug || 1, 'i32');
+  Module.setValue(ptr + offset, config.debug || 0, 'i32');
   offset += 4;
 
   const providerLen = Module.lengthBytesUTF8(config.provider || 'cpu') + 1;
@@ -103,7 +103,7 @@ function initSherpaOnnxSpeakerEmbeddingExtractorConfig(config, Module) {
   Module.setValue(ptr + offset, config.numThreads || 1, 'i32');
   offset += 4;
 
-  Module.setValue(ptr + offset, config.debug || 1, 'i32');
+  Module.setValue(ptr + offset, config.debug || 0, 'i32');
   offset += 4;
 
   Module.setValue(ptr + offset, buffer + modelLen, 'i8*');
@@ -270,11 +270,15 @@ class OfflineSpeakerDiarization {
 }
 
 function createOfflineSpeakerDiarization(Module, myConfig) {
-  const config = {
+  let config = {
     segmentation: {
       pyannote: {model: './segmentation.onnx'},
+      debug: 1,
+    },
+    embedding: {
+      model: './embedding.onnx',
+      debug: 1,
     },
-    embedding: {model: './embedding.onnx'},
     clustering: {numClusters: -1, threshold: 0.5},
     minDurationOn: 0.3,
     minDurationOff: 0.5,