obs-localvocal/cmake/BuildWhispercpp.cmake

include(ExternalProject)

set(CMAKE_OSX_ARCHITECTURES_ "arm64$<SEMICOLON>x86_64")

if(${CMAKE_BUILD_TYPE} STREQUAL Release OR ${CMAKE_BUILD_TYPE} STREQUAL RelWithDebInfo)
  set(Whispercpp_BUILD_TYPE Release)
else()
  set(Whispercpp_BUILD_TYPE Debug)
endif()

# On linux add the `-fPIC` flag to the compiler
if(UNIX AND NOT APPLE)
  set(WHISPER_EXTRA_CXX_FLAGS "-fPIC")
endif()

# if on Windows - download OpenBLAS prebuilt binaries
if(WIN32)
    set(OpenBLAS_URL
        "https://github.com/xianyi/OpenBLAS/releases/download/v0.3.24/OpenBLAS-0.3.24-x64.zip")
    set(OpenBLAS_SHA256
     "8E777E406BA7030D21ADB18683D6175E4FA5ADACFBC09982C01E81245B348132"
    )
    ExternalProject_Add(
      OpenBLAS
      URL ${OpenBLAS_URL}
      URL_HASH SHA256=${OpenBLAS_SHA256}
      DOWNLOAD_NO_PROGRESS true
      CONFIGURE_COMMAND ""
      BUILD_COMMAND ""
      INSTALL_COMMAND ${CMAKE_COMMAND} -E copy_directory <SOURCE_DIR> <INSTALL_DIR>)
    ExternalProject_Get_Property(OpenBLAS INSTALL_DIR)
    set(OpenBLAS_DIR ${INSTALL_DIR})
endif(WIN32)

ExternalProject_Add(
  Whispercpp_Build
  DOWNLOAD_EXTRACT_TIMESTAMP true
  GIT_REPOSITORY https://github.com/ggerganov/whisper.cpp.git
  GIT_TAG 7b374c9ac9b9861bb737eec060e4dfa29d229259
  BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --config ${Whispercpp_BUILD_TYPE}
  BUILD_BYPRODUCTS <INSTALL_DIR>/lib/static/${CMAKE_STATIC_LIBRARY_PREFIX}whisper${CMAKE_STATIC_LIBRARY_SUFFIX}
    <INSTALL_DIR>/bin/${CMAKE_SHARED_LIBRARY_PREFIX}whisper${CMAKE_SHARED_LIBRARY_SUFFIX}
    <INSTALL_DIR>/lib/${CMAKE_IMPORT_LIBRARY_PREFIX}whisper${CMAKE_IMPORT_LIBRARY_SUFFIX}
  CMAKE_GENERATOR ${CMAKE_GENERATOR}
  INSTALL_COMMAND ${CMAKE_COMMAND} --install <BINARY_DIR> --config ${Whispercpp_BUILD_TYPE} && ${CMAKE_COMMAND} -E copy <BINARY_DIR>/${Whispercpp_BUILD_TYPE}/whisper.lib <INSTALL_DIR>/lib
  CONFIGURE_COMMAND
             ${CMAKE_COMMAND} -E env OPENBLAS_PATH=${OpenBLAS_DIR}
             ${CMAKE_COMMAND} <SOURCE_DIR> -B <BINARY_DIR> -G ${CMAKE_GENERATOR}
             -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
             -DCMAKE_BUILD_TYPE=${Whispercpp_BUILD_TYPE}
             -DCMAKE_GENERATOR_PLATFORM=${CMAKE_GENERATOR_PLATFORM}
             -DCMAKE_OSX_DEPLOYMENT_TARGET=10.13
             -DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES_}
             -DCMAKE_CXX_FLAGS=${WHISPER_EXTRA_CXX_FLAGS}
             -DCMAKE_C_FLAGS=${WHISPER_EXTRA_CXX_FLAGS}
             -DBUILD_SHARED_LIBS=ON
             -DWHISPER_BUILD_TESTS=OFF
             -DWHISPER_BUILD_EXAMPLES=OFF
             -DWHISPER_BLAS=ON)

if(WIN32)
    add_dependencies(Whispercpp_Build OpenBLAS)
endif(WIN32)

ExternalProject_Get_Property(Whispercpp_Build INSTALL_DIR)

add_library(Whispercpp::Whisper SHARED IMPORTED)
set_target_properties(
  Whispercpp::Whisper
  PROPERTIES IMPORTED_LOCATION
             ${INSTALL_DIR}/bin/${CMAKE_SHARED_LIBRARY_PREFIX}whisper${CMAKE_SHARED_LIBRARY_SUFFIX})
set_target_properties(
  Whispercpp::Whisper
  PROPERTIES IMPORTED_IMPLIB
            ${INSTALL_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}whisper${CMAKE_STATIC_LIBRARY_SUFFIX})

install(FILES ${INSTALL_DIR}/bin/${CMAKE_SHARED_LIBRARY_PREFIX}whisper${CMAKE_SHARED_LIBRARY_SUFFIX} DESTINATION "obs-plugins/64bit")

# add openblas to the link line
if(WIN32)
    add_library(Whispercpp::OpenBLAS STATIC IMPORTED)
    set_target_properties(
      Whispercpp::OpenBLAS
      PROPERTIES IMPORTED_LOCATION
                 ${OpenBLAS_DIR}/lib/libopenblas.dll.a)
    install(FILES ${OpenBLAS_DIR}/bin/libopenblas.dll DESTINATION "obs-plugins/64bit")
endif(WIN32)

add_library(Whispercpp INTERFACE)
add_dependencies(Whispercpp Whispercpp_Build)
target_link_libraries(Whispercpp INTERFACE Whispercpp::Whisper Whispercpp::OpenBLAS)
set_target_properties(Whispercpp::Whisper PROPERTIES INTERFACE_INCLUDE_DIRECTORIES ${INSTALL_DIR}/include)
if(APPLE)
  target_link_libraries(Whispercpp INTERFACE "-framework Accelerate")
endif(APPLE)