### Compile and Install libsoundio

Source: https://github.com/andrewrk/libsoundio/wiki/Compiling-for-Windows

Compiles and installs libsoundio using the 'make install' command after CMake configuration.

```bash
make install
```

--------------------------------

### Header File Installation

Source: https://github.com/andrewrk/libsoundio/blob/master/CMakeLists.txt

Installs the library header files to the specified include directory.

```cmake
install(FILES
    ${LIBSOUNDIO_HEADERS}
    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/soundio")
```

--------------------------------

### Static Library Build and Installation

Source: https://github.com/andrewrk/libsoundio/blob/master/CMakeLists.txt

Builds a static library if BUILD_STATIC_LIBS is enabled, sets its properties, and installs it.

```cmake
if(BUILD_STATIC_LIBS)
    add_library(libsoundio_static STATIC ${LIBSOUNDIO_SOURCES})
    set_target_properties(libsoundio_static PROPERTIES
        OUTPUT_NAME ${SOUNDIO_STATIC_LIBNAME}
        COMPILE_FLAGS ${LIB_CFLAGS}
        LINKER_LANGUAGE C
    )
    install(TARGETS libsoundio_static DESTINATION ${CMAKE_INSTALL_LIBDIR})
endif()
```

--------------------------------

### Build Documentation

Source: https://github.com/andrewrk/libsoundio/blob/master/README.md

Run this command to build the documentation for libsoundio. Ensure doxygen is installed beforehand.

```bash
make doc
```

--------------------------------

### Shared Library Build and Installation

Source: https://github.com/andrewrk/libsoundio/blob/master/CMakeLists.txt

Builds a shared library (soundio) if BUILD_DYNAMIC_LIBS is enabled, sets its properties, links libraries, and installs it.

```cmake
if(BUILD_DYNAMIC_LIBS)
    add_library(libsoundio_shared SHARED ${LIBSOUNDIO_SOURCES})
    set_target_properties(libsoundio_shared PROPERTIES
        OUTPUT_NAME soundio
        SOVERSION ${LIBSOUNDIO_VERSION_MAJOR}
        VERSION ${LIBSOUNDIO_VERSION}
        COMPILE_FLAGS ${LIB_CFLAGS}
        LINKER_LANGUAGE C
    )
    target_link_libraries(libsoundio_shared LINK_PUBLIC ${LIBSOUNDIO_LIBS})
    install(TARGETS libsoundio_shared DESTINATION ${CMAKE_INSTALL_LIBDIR})
endif()
```

--------------------------------

### Install MinGW-w64 GCC on Linux

Source: https://github.com/andrewrk/libsoundio/wiki/Compiling-for-Windows

Installs the MinGW-w64 GCC compiler and pkg-config on Debian/Ubuntu-based systems for cross-compilation.

```bash
sudo apt-get install mingw64-x-gcc mingw64-x-pkgconfig
                       # ^--  or mingw32-x-gcc mingw32-x-pkgconfig, or both
```

--------------------------------

### Build libsoundio for Windows with MXE

Source: https://github.com/andrewrk/libsoundio/blob/master/README.md

Build instructions for Windows using the MXE cross-compilation environment. This example shows how to set up MXE and then configure CMake for 32-bit Windows targets.

```bash
git clone https://github.com/mxe/mxe
cd mxe
make MXE_TARGETS='x86_64-w64-mingw32.static i686-w64-mingw32.static' gcc
```

```bash
mkdir build-win32
cd build-win32
cmake .. -DCMAKE_TOOLCHAIN_FILE=/path/to/mxe/usr/i686-w64-mingw32.static/share/cmake/mxe-conf.cmake
make
```

```bash
mkdir build-win64
cd build-win64
cmake .. -DCMAKE_TOOLCHAIN_FILE=/path/to/mxe/usr/x86_64-w64-mingw32.static/share/cmake/mxe-conf.cmake
make
```

--------------------------------

### Install Build Tools in MSYS2

Source: https://github.com/andrewrk/libsoundio/wiki/Compiling-for-Windows

Installs essential build tools like make, cmake, and pkgconfig, along with optional utilities, within the MSYS2 environment.

```bash
pacman -S  make cmake pkgconfig
```

```bash
pacman -S  p7zip gzip tar wget vim
             # ^-- optional, may come in handy :)
```

--------------------------------

### Build libsoundio with CMake

Source: https://github.com/andrewrk/libsoundio/blob/master/README.md

Standard build process for libsoundio using CMake. Assumes necessary dependencies are installed.

```bash
mkdir build
cd build
cmake ..
make
sudo make install
```

--------------------------------

### Update MSYS2 and Install MinGW-w64 GCC on Windows

Source: https://github.com/andrewrk/libsoundio/wiki/Compiling-for-Windows

Updates MSYS2 packages and installs the MinGW-w64 GCC compiler for native Windows compilation.

```bash
pacman -Sy; pacman --needed -S bash pacman pacman-mirrors msys2-runtime
```

```bash
pacman -Su; pacman -S mingw-w64-x86_64-gcc
                        # ^--  or mingw-w64-i686-gcc, or both
```

--------------------------------

### Configure libsoundio Build with CMake

Source: https://github.com/andrewrk/libsoundio/wiki/Compiling-for-Windows

Configures the libsoundio project using CMake, specifying the toolchain file and installation prefix.

```bash
cd libsoundio; mkdir build out; cd build;
   cmake .. -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake -DCMAKE_INSTALL_PREFIX=../out
```

--------------------------------

### Platform-Specific Compiler Flags (MSVC)

Source: https://github.com/andrewrk/libsoundio/blob/master/CMakeLists.txt

Sets compiler flags for MSVC, including /Wall for debug builds and specific flags for libraries, examples, and tests.

```cmake
if(MSVC)
    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /Wall")
    set(LIB_CFLAGS "/TP /W4")
    set(EXAMPLE_CFLAGS "/W4")
    set(TEST_CFLAGS "${LIB_CFLAGS}")
    set(TEST_LDFLAGS " ")
    set(LIBM " ")
else()
    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -Werror -pedantic")
    set(LIB_CFLAGS "-std=c11 -fvisibility=hidden -Wall -Werror=strict-prototypes -Werror=old-style-definition -Werror=missing-prototypes -D_REENTRANT -D_POSIX_C_SOURCE=200809L -Wno-missing-braces")
    set(EXAMPLE_CFLAGS "-std=c99 -Wall")
    set(TEST_CFLAGS "${LIB_CFLAGS} -fprofile-arcs -ftest-coverage")
    set(TEST_LDFLAGS "-fprofile-arcs -ftest-coverage")
    set(LIBM "m")
endif()
```

--------------------------------

### Include Directories Configuration

Source: https://github.com/andrewrk/libsoundio/blob/master/CMakeLists.txt

Sets up include directories for the project, including source, binary, test, and src directories.

```cmake
include_directories(
    ${libsoundio_SOURCE_DIR}
    ${libsoundio_BINARY_DIR}
    "${libsoundio_SOURCE_DIR}/test"
    "${libsoundio_SOURCE_DIR}/src"
)
```

--------------------------------

### Configuration File Generation

Source: https://github.com/andrewrk/libsoundio/blob/master/CMakeLists.txt

Generates configuration header and Doxygen configuration files from input templates.

```cmake
configure_file(
    "${libsoundio_SOURCE_DIR}/src/config.h.in"
    ${CONFIGURE_OUT_FILE}
)
set(DOXYGEN_CONF_FILE "${libsoundio_BINARY_DIR}/doxygen.conf")
configure_file(
    "${libsoundio_SOURCE_DIR}/doc/doxygen.conf.in"
    ${DOXYGEN_CONF_FILE}
)
```

--------------------------------

### Emit Sine Wave with libsoundio

Source: https://github.com/andrewrk/libsoundio/blob/master/README.md

A complete C program that generates a sine wave and plays it through the default audio output device. It handles device connection, stream creation, and audio data writing.

```c
#include <soundio/soundio.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

static const float PI = 3.1415926535f;
static float seconds_offset = 0.0f;
static void write_callback(struct SoundIoOutStream *outstream,
        int frame_count_min, int frame_count_max)
{
    const struct SoundIoChannelLayout *layout = &outstream->layout;
    float float_sample_rate = outstream->sample_rate;
    float seconds_per_frame = 1.0f / float_sample_rate;
    struct SoundIoChannelArea *areas;
    int frames_left = frame_count_max;
    int err;

    while (frames_left > 0) {
        int frame_count = frames_left;

        if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count))) {
            fprintf(stderr, "%s\n", soundio_strerror(err));
            exit(1);
        }

        if (!frame_count)
            break;

        float pitch = 440.0f;
        float radians_per_second = pitch * 2.0f * PI;
        for (int frame = 0; frame < frame_count; frame += 1) {
            float sample = sinf((seconds_offset + frame * seconds_per_frame) * radians_per_second);
            for (int channel = 0; channel < layout->channel_count; channel += 1) {
                float *ptr = (float*)(areas[channel].ptr + areas[channel].step * frame);
                *ptr = sample;
            }
        }
        seconds_offset = fmodf(seconds_offset +
            seconds_per_frame * frame_count, 1.0f);

        if ((err = soundio_outstream_end_write(outstream))) {
            fprintf(stderr, "%s\n", soundio_strerror(err));
            exit(1);
        }

        frames_left -= frame_count;
    }
}

int main(int argc, char **argv) {
    int err;
    struct SoundIo *soundio = soundio_create();
    if (!soundio) {
        fprintf(stderr, "out of memory\n");
        return 1;
    }

    if ((err = soundio_connect(soundio))) {
        fprintf(stderr, "error connecting: %s", soundio_strerror(err));
        return 1;
    }

    soundio_flush_events(soundio);

    int default_out_device_index = soundio_default_output_device_index(soundio);
    if (default_out_device_index < 0) {
        fprintf(stderr, "no output device found");
        return 1;
    }

    struct SoundIoDevice *device = soundio_get_output_device(soundio, default_out_device_index);
    if (!device) {
        fprintf(stderr, "out of memory");
        return 1;
    }

    fprintf(stderr, "Output device: %s\n", device->name);

    struct SoundIoOutStream *outstream = soundio_outstream_create(device);
    outstream->format = SoundIoFormatFloat32NE;
    outstream->write_callback = write_callback;

    if ((err = soundio_outstream_open(outstream))) {
        fprintf(stderr, "unable to open device: %s", soundio_strerror(err));
        return 1;
    }

    if (outstream->layout_error)
        fprintf(stderr, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error));

    if ((err = soundio_outstream_start(outstream))) {
        fprintf(stderr, "unable to start device: %s", soundio_strerror(err));
        return 1;
    }

    for (;;) 
        soundio_wait_events(soundio);

    soundio_outstream_destroy(outstream);
    soundio_device_unref(device);
    soundio_destroy(soundio);
    return 0;
}

```

--------------------------------

### Library Linking Configuration

Source: https://github.com/andrewrk/libsoundio/blob/master/CMakeLists.txt

Defines the list of libraries to be linked against, including backend-specific and system libraries.

```cmake
set(LIBSOUNDIO_LIBS
    ${JACK_LIBRARY}
    ${PULSEAUDIO_LIBRARY}
    ${ALSA_LIBRARIES}
    ${COREAUDIO_LIBRARY}
    ${COREFOUNDATION_LIBRARY}
    ${AUDIOUNIT_LIBRARY}
    ${CMAKE_THREAD_LIBS_INIT}
)
```

--------------------------------

### Clean Previous Build and Configure for Debug

Source: https://github.com/andrewrk/libsoundio/wiki/Compiling-for-Windows

Cleans the build artifacts and CMake cache, then reconfigures the project to build a debug version of libsoundio.

```bash
make clean; rm CMakeCache.txt # cleanup previous builds
```

```diff
- cmake .. -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake -DCMAKE_INSTALL_PREFIX=../out
+ cmake .. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake -DCMAKE_INSTALL_PREFIX=../out
```

--------------------------------

### Clone libsoundio Source Code

Source: https://github.com/andrewrk/libsoundio/wiki/Compiling-for-Windows

Clones the libsoundio master branch from GitHub using Git.

```bash
git clone -b master https://andrewrk/libsoundio
```

--------------------------------

### Conditional Source File Inclusion

Source: https://github.com/andrewrk/libsoundio/blob/master/CMakeLists.txt

Includes source files based on the availability of audio backends like ALSA, CoreAudio, and WASAPI.

```cmake
if(SOUNDIO_HAVE_ALSA)
    set(LIBSOUNDIO_SOURCES ${LIBSOUNDIO_SOURCES}
        "${libsoundio_SOURCE_DIR}/src/alsa.c"
    )
endif()
if(SOUNDIO_HAVE_COREAUDIO)
    set(LIBSOUNDIO_SOURCES ${LIBSOUNDIO_SOURCES}
        "${libsoundio_SOURCE_DIR}/src/coreaudio.c"
    )
endif()
if(SOUNDIO_HAVE_WASAPI)
    set(LIBSOUNDIO_SOURCES ${LIBSOUNDIO_SOURCES}
        "${libsoundio_SOURCE_DIR}/src/wasapi.c"
    )
endif()
```

--------------------------------

### CMake Toolchain File for MinGW

Source: https://github.com/andrewrk/libsoundio/wiki/Compiling-for-Windows

This CMake toolchain file configures the build environment for cross-compiling with MinGW on Linux. It sets system names, processor architectures, tool prefixes, and compiler paths.

```cmake
# Required by cmake if `uname -s` is inadaquate
set(CMAKE_SYSTEM_NAME               Windows)
set(CMAKE_SYSTEM_VERSION            1)

# Mingw architecture default is 64-bit
# To override: 
#   $ export MINGW_ARCH=32 
if(DEFINED ENV{MINGW_ARCH}) 
        set(MINGW_ARCH              "$ENV{MINGW_ARCH}")
else()
        set(MINGW_ARCH              "64")
endif()

if(${MINGW_ARCH} STREQUAL "32")
        set(CMAKE_SYSTEM_PROCESSOR  "i686")
elseif(${MINGW_ARCH} STREQUAL "64")
        set(CMAKE_SYSTEM_PROCESSOR  "x86_64")
else()
        message(FATAL_ERROR         "Unknown system architecture specified") 
endif()

# Path to mingw
set(MINGW_PREFIX                    "/opt/mingw${MINGW_ARCH}")
# Linux mingw requires explicitly defined tools to prevent clash with native system tools
set(MINGW_TOOL_PREFIX               ${MINGW_PREFIX}/bin/${CMAKE_SYSTEM_PROCESSOR}-w64-mingw32-)

# Windows msys mingw ships with a mostly suitable preconfigured environment
if(DEFINED ENV{MSYSCON})
        set(CMAKE_GENERATOR         "MSYS Makefiles" CACHE STRING "" FORCE)
        set(MINGW_PREFIX            "/mingw${MINGW_ARCH}")
        set(MINGW_TOOL_PREFIX       "${MINGW_PREFIX}/bin/") 

        # Msys compiler does not support @CMakeFiles/Include syntax
        set(CMAKE_C_USE_RESPONSE_FILE_FOR_INCLUDES   OFF)
        set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_INCLUDES OFF)
endif()

# The target environment
set(CMAKE_FIND_ROOT_PATH            ${MINGW_PREFIX})
set(CMAKE_INSTALL_PREFIX            ${MINGW_PREFIX})

# which compilers to use for C and C++
set(CMAKE_C_COMPILER                ${MINGW_TOOL_PREFIX}gcc)
set(CMAKE_CXX_COMPILER              ${MINGW_TOOL_PREFIX}g++)
set(CMAKE_RC_COMPILER               ${MINGW_TOOL_PREFIX}windres)

# adjust the default behaviour of the FIND_XXX() commands:
# search headers and libraries in the target environment, search 
# programs in the host environment
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

# Fix header finds
set(WASAPI_INCLUDE_DIR              ${MINGW_PREFIX}/include)

# Set release to be defaut
if(NOT CMAKE_BUILD_TYPE)
        set(CMAKE_BUILD_TYPE        "Release" CACHE STRING "Defaulting to Release build type for mingw")
endif()
```

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