libsndfile is a C library for reading and writing files containing sampled audio data.
The libsndfile project was originally developed and maintained by Erik de Castro Lopo erikd@mega-nerd.com aka @erikd. The project was developed on Github at https://github.com/erikd/libsndfile.
After the release of version 1.0.30, @erikd transferred the project to the libsndfile team, see AUTHORS for details.
The canonical source code repository for libsndfile is at https://github.com/libsndfile/libsndfile.
You can grab the source code using:
git clone https://github.com/libsndfile/libsndfile.git
For building for Android see BuildingForAndroid.
There are currently two build systems: the traditional GNU autotool based one and modern CMake based build system. Use of the CMake build system is documented below.
Setting up a build environment for libsndfile on Debian or Ubuntu is as simple as:
sudo apt install autoconf autogen automake build-essential libasound2-dev \
libflac-dev libogg-dev libtool libvorbis-dev libopus-dev libmp3lame-dev \
libmpg123-dev pkg-config python
For other Linux distributions or any of the *BSDs, the setup should be similar although the package install tools and package names may be slightly different.
Similarly on Mac OS X, assuming brew is already installed:
brew install autoconf autogen automake flac libogg libtool libvorbis opus mpg123 pkg-config
Once the build environment has been set up, building and testing libsndfile is as simple as:
autoreconf -vif
./configure --enable-werror
make
make check
Although Autotools is the primary and recommended build toolchain, CMake meta build generator is also available. The build process with CMake takes place in two stages. First, standard build files are created from configuration scripts. Then the platform's native build tools are used for the actual building. CMake can produce Microsoft Visual Studio project and solution files, Unix Makefiles, Xcode projects and many more.
Some IDE support CMake natively or with plugins, check you IDE documentation for details.
- C99-compliant compiler toolchain (tested with GCC, Clang and Visual Studio 2015)
- CMake 3.1.3 or newer
There are some recommended packages to enable all features of libsndfile:
- Ogg, Vorbis and FLAC libraries and headers to enable these formats support
- ALSA development package under Linux to build sndfile-play utility
- Sndio development package under BSD to build sndfile-play utility
CMake can handle out-of-place builds, enabling several builds from the same source tree, and cross-compilation. The ability to build a directory tree outside the source tree is a key feature, ensuring that if a build directory is removed, the source files remain unaffected.
mkdir CMakeBuild
cd CMakeBuild
Then run cmake command with directory where CMakeLists.txt script is located
as argument (relative paths are supported):
cmake ..
This command will configure and write build script or solution to CMakeBuild
directory. CMake is smart enough to create Unix makefiles under Linux or Visual
Studio solution if you have Visual Studio installed, but you can configure
generator
with -G command line parameter:
cmake .. -G"Unix Makefiles"
The build procedure depends on the selected generator. With "Unix Makefiles" you can type:
make & make install
With "Visual Studio" and some other generators you can open solution or project
from CMakeBuild directory and build using IDE.
Finally, you can use unified command:
cmake --build .
CMake also provides Qt-based cross platform GUI, cmake-gui. Using it is trivial and does not require detailed explanations.
You can pass additional options with /D<parameter>=<value> when you run
cmake command. Some useful system options:
CMAKE_C_FLAGS- additional C compiler flagsCMAKE_BUILD_TYPE- configuration type,DEBUG,RELEASE,RELWITHDEBINFOorMINSIZEREL.DEBUGis defaultCMAKE_INSTALL_PREFIX- build install location, the same as--prefixoption ofconfigurescript
Useful libsndfile options:
-
BUILD_SHARED_LIBS- build shared library (DLL under Windows) whenON, build static library otherwise. This option isOFFby default. -
BUILD_PROGRAMS- build libsndfile's utilities fromprograms/directory,ONby default. -
BUILD_EXAMPLES- build examples,ONby default. -
BUILD_TESTING- build tests. Then you can run tests withctestcommand,ONby default. SettingBUILD_SHARED_LIBStoONdisables this option. -
ENABLE_EXTERNAL_LIBS- enable Ogg, Vorbis, FLAC and Opus support. This option is available and set toONif all dependency libraries were found. -
ENABLE_MPEG- MP3 support. This option is available and set toONif all dependency libraries were found. -
ENABLE_BOW_DOCS- enable black-on-white documentation theme,OFFby default. -
ENABLE_EXPERIMENTAL- enable experimental code. Don't use it if you are not sure. This option isOFFby default. -
ENABLE_CPACK- enable CPack support. This option isONby default. -
ENABLE_PACKAGE_CONFIG- generate and install package config file. -
INSTALL_PKGCONFIG_MODULE- generate and install pkg-config module. -
INSTALL_MANPAGES- install man pages for programs. This option isONby default -
ENABLE_STATIC_RUNTIME- enable static runtime on Windows platform (MSVC and MinGW),OFFby default.Note: For MSVC compiler this option is deprecated for CMake >= 3.15, see policy CMP0091. Use
CMAKE_MSVC_RUNTIME_LIBRARYoption instead.Note: For MinGW toolchain this option is experimental. If you enabled it and then disabled again, you need to clear CMake cache (delete CMakeCache.txt).
-
ENABLE_COMPATIBLE_LIBSNDFILE_NAME- set DLL name tolibsndfile-1.dll(canonical name) on Windows platform,sndfile.dllotherwise,OFFby default. Library name can be different depending on platform. The well known DLL name on Windows platform islibsndfile-1.dll, because the only way to build Windows library before was MinGW toolchain with Autotools. This name is native for MinGW ecosystem, Autotools constructs it using MinGW platform rules fromsndfiletarget. But when you build with CMake using native Windows compiler, the name issndfile.dll. This is name for native Windows platform, because Windows has no library naming rules. It is preferred because you can search library using package manager or CMake'sfind_librarycommand on any platform using the samesndfilename. -
ENABLE_SSE2- add compiler flag to enable SSE2 if required,ONby default.This option is for X86 and GCC compatible compilers configurations only.
If you compile for other SIMD set, e.g. AVX2, you may want to set
ENABLE_SSE2toOFF.Note: This option is not active for X64 configuration, because SSE2 is always available in this mode and all optimizations are enabled by default.
Deprecated options:
DISABLE_EXTERNAL_LIBS- disable Ogg, Vorbis and FLAC support. Replaced byENABLE_EXTERNAL_LIBSBUILD_STATIC_LIBS- build static library. UseBUILD_SHARED_LIBSinstead
First you need to add FindOgg.cmake, FindVorbis.cmake, FindFLAC.cmake and
FindOpus.cmake files to some directory inside your CMake project (usually
cmake) and add it to CMAKE_MODULE_PATH:
project(SomeApplication)
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
Now you can search libsndfile library from your CMakeLists.txt
with this command:
find_package(SndFile)
SndFile_FOUND is set to ON when library is found.
If libsndfile dependency is critical, you can add REQUIRED to
find_package:
find_package(SndFile REQUIRED)
With with option find_package will terminate configuration process
if libsndfile is not found.
You can also add version check:
find_package(SndFile 1.0.29)
find_package will report error, if libsndfile version is < 1.0.29.
You can combine REQUIRED and version if you need.
To link libsndfile library use:
target_link_libraries(my_application PRIVATE SndFile::sndfile)
First advice about Visual Studio system CRT libraries, it is system code linked as static or dynamic library to every C application.
You can find related option in Visual Studio project properties:
C/C++ -> Code Generation -> Runtime Library
Dynamic version of system CRT library is default and it means that end user needs to have the same runtime library installed on his system. Most likely it is so, but if it is not, the user will see this error message using libsndfile DLL:
"The program can't start because <crt-dll-name>.dll is missing from your computer. Try reinstalling the program to fix this problem. "
To avoid this, you may want to enable static CRT library linking. In this case the size of your DLL will increase slightly the size will increase slightly, but you can redistribute the libsndfile DLL without having to install the correct version of the system CRT library.
CMake project will use dynamic system CRT libraries by default, just like
Visual Studio does. But you can change it using ENABLE_STATIC_RUNTIME or
CMAKE_MSVC_RUNTIME_LIBRARY options.
Note: You cannot use both options at the same time, it will lead to a configuration error.
If you have CMake >= 3.15 you should use
CMAKE_MSVC_RUNTIME_LIBRARY option.
This will enable static linking:
cmake .. -D"MultiThreaded$<$<CONFIG:Debug>:Debug>"
You can use libsndfile ENABLE_STATIC_RUNTIME option to to control CRT library
linking for CMake project: OFF or unset (default) for dynamic, and ON for
static linking:
cmake .. -DENABLE_STATIC_RUNTIME=ON
Note: This option is deprecated and may be removed in far future because we
have standard option CMAKE_MSVC_RUNTIME_LIBRARY now.
Second advice is about Ogg, Vorbis FLAC and Opus support. Searching external libraries under Windows is a little bit tricky. The best way is to use Vcpkg.
Install Vcpkg and then add this parameter to cmake command line:
-DCMAKE_TOOLCHAIN_FILE=<path-to-vcpkg>/scripts/buildsystems/vcpkg.cmake
You also need to set VCPKG_TARGET_TRIPLET if you want to use static libraries:
-DVCPKG_TARGET_TRIPLET=x64-windows-static
Then you need to install static libogg, libvorbis, libflac, libopus, mpg123 and mp3lame Vcpkg packages.
After 1.1.0beta2 you don't need to install dependencies manually. Libsndfile now supports Vcpkg manifest mode and all dependencies are installed automatically.
However, you can turn off the manifest mode and return to the classic mode using
the VCPKG_MANIFEST_MODE parameter from the command line:
-DVCPKG_MANIFEST_MODE=OFF
In classic mode, you need to install the required libraries manually:
vcpkg install libvorbis:x64-windows-static libflac:x64-windows-static
opus:x64-windows-static mp3lame:x86-windows-static mpg123:x86-windows-static
libvorbis:x86-windows-static libflac:x86-windows-static
opus:x86-windows-static mp3lame:x86-windows-static mpg123:x86-windows-static
Note: Use must use the same CRT library for external libraries and the
libsndfile library itself. For *-static triplets Vcpkg uses
static CRT.
See CONTRIBUTING.md for details.