add WebAssembly for Kws

CMakeLists.txt

@@ -23,6 +23,7 @@ option(SHERPA_ONNX_ENABLE_GPU "Enable ONNX Runtime GPU support" OFF)
 option(SHERPA_ONNX_ENABLE_WASM "Whether to enable WASM" OFF)
 option(SHERPA_ONNX_ENABLE_WASM_TTS "Whether to enable WASM for TTS" OFF)
 option(SHERPA_ONNX_ENABLE_WASM_ASR "Whether to enable WASM for ASR" OFF)
+option(SHERPA_ONNX_ENABLE_WASM_KWS "Whether to enable WASM for KWS" OFF)
 option(SHERPA_ONNX_ENABLE_WASM_NODEJS "Whether to enable WASM for NodeJS" OFF)
 option(SHERPA_ONNX_ENABLE_BINARY "Whether to build binaries" ON)
 option(SHERPA_ONNX_LINK_LIBSTDCPP_STATICALLY "True to link libstdc++ statically. Used only when BUILD_SHARED_LIBS is OFF on Linux" ON)
@@ -135,6 +136,10 @@ if(SHERPA_ONNX_ENABLE_WASM)
   add_definitions(-DSHERPA_ONNX_ENABLE_WASM=1)
 endif()
 
+if(SHERPA_ONNX_ENABLE_WASM_KWS)
+  add_definitions(-DSHERPA_ONNX_ENABLE_WASM_KWS=1)
+endif()
+
 if(NOT CMAKE_CXX_STANDARD)
   set(CMAKE_CXX_STANDARD 14 CACHE STRING "The C++ version to be used.")
 endif()

build-wasm-simd-kws.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env  bash
+
+if [ x"$EMSCRIPTEN" == x"" ]; then
+  if ! command -v emcc &> /dev/null; then
+    echo "Please install emscripten first"
+    echo ""
+    echo "You can use the following commands to install it:"
+    echo ""
+    echo "git clone https://github.com/emscripten-core/emsdk.git"
+    echo "cd emsdk"
+    echo "git pull"
+    echo "./emsdk install latest"
+    echo "./emsdk activate latest"
+    echo "source ./emsdk_env.sh"
+    exit 1
+  else
+    EMSCRIPTEN=$(dirname $(realpath $(which emcc)))
+  fi
+fi
+
+export EMSCRIPTEN=$EMSCRIPTEN
+echo "EMSCRIPTEN: $EMSCRIPTEN"
+if [ ! -f $EMSCRIPTEN/cmake/Modules/Platform/Emscripten.cmake ]; then
+  echo "Cannot find $EMSCRIPTEN/cmake/Modules/Platform/Emscripten.cmake"
+  echo "Please make sure you have installed emsdk correctly"
+  exit 1
+fi
+
+mkdir -p build-wasm-simd-kws
+pushd build-wasm-simd-kws
+
+export SHERPA_ONNX_IS_USING_BUILD_WASM_SH=ON
+
+cmake \
+  -DCMAKE_INSTALL_PREFIX=./install \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DCMAKE_TOOLCHAIN_FILE=$EMSCRIPTEN/cmake/Modules/Platform/Emscripten.cmake \
+  \
+  -DSHERPA_ONNX_ENABLE_PYTHON=OFF \
+  -DSHERPA_ONNX_ENABLE_TESTS=OFF \
+  -DSHERPA_ONNX_ENABLE_CHECK=OFF \
+  -DBUILD_SHARED_LIBS=OFF \
+  -DSHERPA_ONNX_ENABLE_PORTAUDIO=OFF \
+  -DSHERPA_ONNX_ENABLE_JNI=OFF \
+  -DSHERPA_ONNX_ENABLE_C_API=ON \
+  -DSHERPA_ONNX_ENABLE_WEBSOCKET=OFF \
+  -DSHERPA_ONNX_ENABLE_GPU=OFF \
+  -DSHERPA_ONNX_ENABLE_WASM=ON \
+  -DSHERPA_ONNX_ENABLE_WASM_KWS=ON \
+  -DSHERPA_ONNX_ENABLE_BINARY=OFF \
+  -DSHERPA_ONNX_LINK_LIBSTDCPP_STATICALLY=OFF \
+  ..
+make -j8
+make install
+
+ls -lh install/bin/wasm

sherpa-onnx/c-api/c-api.cc

@@ -473,10 +473,16 @@ SherpaOnnxKeywordSpotter* CreateKeywordSpotter(
     SHERPA_ONNX_LOGE("%s\n", spotter_config.ToString().c_str());
   }
 
+#ifndef SHERPA_ONNX_ENABLE_WASM_KWS
+  // due to the limitations of the wasm file system,
+  // keywords file will be packaged into the sherpa-onnx-wasm-kws-main.data file
+  // Solution: take keyword_file variable is directly
+  // parsed as a string of keywords
   if (!spotter_config.Validate()) {
     SHERPA_ONNX_LOGE("Errors in config!");
     return nullptr;
   }
+#endif
 
   SherpaOnnxKeywordSpotter* spotter = new SherpaOnnxKeywordSpotter;
 
@@ -593,7 +599,6 @@ void DestroyKeywordResult(const SherpaOnnxKeywordResult *r) {
   }
 }
 
-
 // ============================================================
 // For VAD
 // ============================================================

sherpa-onnx/csrc/keyword-spotter-transducer-impl.h

@@ -266,15 +266,22 @@ class KeywordSpotterTransducerImpl : public KeywordSpotterImpl {
   }
 
   void InitKeywords() {
+#ifdef SHERPA_ONNX_ENABLE_WASM_KWS
+    // Due to the limitations of the wasm file system,
+    // the keyword_file variable is directly parsed as a string of keywords
+    // if WASM KWS on
+    std::istringstream is(config_.keywords_file);
+    InitKeywords(is);
+#else
     // each line in keywords_file contains space-separated words
-
     std::ifstream is(config_.keywords_file);
     if (!is) {
       SHERPA_ONNX_LOGE("Open keywords file failed: %s",
                        config_.keywords_file.c_str());
       exit(-1);
     }
     InitKeywords(is);
+#endif
   }
 
 #if __ANDROID_API__ >= 9

sherpa-onnx/csrc/transducer-keyword-decoder.cc

@@ -2,16 +2,14 @@
 //
 // Copyright (c)  2023-2024  Xiaomi Corporation
 
-#include "sherpa-onnx/csrc/transducer-keyword-decoder.h"
-
 #include <algorithm>
 #include <cmath>
-#include <cstring>
 #include <utility>
 #include <vector>
 
 #include "sherpa-onnx/csrc/log.h"
 #include "sherpa-onnx/csrc/onnx-utils.h"
+#include "sherpa-onnx/csrc/transducer-keyword-decoder.h"
 
 namespace sherpa_onnx {
 

wasm/CMakeLists.txt

@@ -6,6 +6,10 @@ if(SHERPA_ONNX_ENABLE_WASM_ASR)
   add_subdirectory(asr)
 endif()
 
+if(SHERPA_ONNX_ENABLE_WASM_KWS)
+  add_subdirectory(kws)
+endif()
+
 if(SHERPA_ONNX_ENABLE_WASM_NODEJS)
   add_subdirectory(nodejs)
 endif()

wasm/kws/CMakeLists.txt

@@ -0,0 +1,54 @@
+if(NOT $ENV{SHERPA_ONNX_IS_USING_BUILD_WASM_SH})
+    message(FATAL_ERROR "Please use ./build-wasm-simd-kws.sh to build for wasm KWS")
+endif()
+
+if(NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/assets/decoder-epoch-12-avg-2-chunk-16-left-64.onnx")
+    message(WARNING "${CMAKE_CURRENT_SOURCE_DIR}/assets/decoder-epoch-12-avg-2-chunk-16-left-64.onnx does not exist")
+    message(FATAL_ERROR "Please read ${CMAKE_CURRENT_SOURCE_DIR}/assets/README.md before you continue")
+endif()
+
+set(exported_functions
+        AcceptWaveform
+        CreateKeywordSpotter
+        DestroyKeywordSpotter
+        CreateKeywordStream
+        DecodeKeywordStream
+        GetKeywordResult
+        DestroyKeywordResult
+        IsKeywordStreamReady
+        InputFinished
+)
+set(mangled_exported_functions)
+foreach(x IN LISTS exported_functions)
+    list(APPEND mangled_exported_functions "_${x}")
+endforeach()
+
+list(JOIN mangled_exported_functions "," all_exported_functions)
+
+include_directories(${CMAKE_SOURCE_DIR})
+set(MY_FLAGS "-s FORCE_FILESYSTEM=1 -s INITIAL_MEMORY=512MB -s ALLOW_MEMORY_GROWTH=1")
+string(APPEND MY_FLAGS " -sSTACK_SIZE=10485760 ")
+string(APPEND MY_FLAGS " -sEXPORTED_FUNCTIONS=[_CopyHeap,_malloc,_free,${all_exported_functions}] ")
+string(APPEND MY_FLAGS "--preload-file ${CMAKE_CURRENT_SOURCE_DIR}/assets@. ")
+string(APPEND MY_FLAGS " -sEXPORTED_RUNTIME_METHODS=['ccall','stringToUTF8','setValue','getValue','lengthBytesUTF8','UTF8ToString'] ")
+message(STATUS "MY_FLAGS: ${MY_FLAGS}")
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${MY_FLAGS}")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${MY_FLAGS}")
+set(CMAKE_EXECUTBLE_LINKER_FLAGS "${CMAKE_EXECUTBLE_LINKER_FLAGS} ${MY_FLAGS}")
+
+add_executable(sherpa-onnx-wasm-kws-main sherpa-onnx-wasm-main-kws.cc)
+target_link_libraries(sherpa-onnx-wasm-kws-main sherpa-onnx-c-api)
+install(TARGETS sherpa-onnx-wasm-kws-main DESTINATION bin/wasm)
+
+install(
+        FILES
+        "sherpa-onnx-kws.js"
+        "app.js"
+        "index.html"
+        "$<TARGET_FILE_DIR:sherpa-onnx-wasm-kws-main>/sherpa-onnx-wasm-kws-main.js"
+        "$<TARGET_FILE_DIR:sherpa-onnx-wasm-kws-main>/sherpa-onnx-wasm-kws-main.wasm"
+        "$<TARGET_FILE_DIR:sherpa-onnx-wasm-kws-main>/sherpa-onnx-wasm-kws-main.data"
+        DESTINATION
+        bin/wasm
+)