Libsndfile is a C library for reading and writing files containing sampled sound (such as MS Windows WAV and the Apple/SGI AIFF format) through one standard library interface. It is released in source code format under the Gnu Lesser General Public License.

The library was written to compile and run on a Linux system but should compile and run on just about any Unix (including MacOS X). There are also pre-compiled binaries available for 32 and 64 bit windows.

It was designed to handle both little-endian (such as WAV) and big-endian (such as AIFF) data, and to compile and run correctly on little-endian (such as Intel and DEC/Compaq Alpha) processor systems as well as big-endian processor systems such as Motorola 68k, Power PC, MIPS and Sparc. Hopefully the design of the library will also make it easy to extend for reading and writing new sound file formats.

It has been compiled and tested (at one time or another) on the following systems:

• Every platform supported by Debian GNU/Linux including x86_64-linux-gnu, i486-linux-gnu, powerpc-linux-gnu, sparc-linux-gnu, alpha-linux-gnu, mips-linux-gnu and armel-linux-gnu.
• powerpc-apple-darwin7.0 (Mac OS X 10.3)
• sparc-sun-solaris2.8 (using gcc)
• mips-sgi-irix5.3 (using gcc)
• QNX 6.0
• i386-unknown-openbsd2.9
• Microsoft Windows

At the moment, each new release is being tested on i386 Linux, x86_64 Linux, PowerPC Linux, Win32 and Win64.

Features

libsndfile has the following main features :

• Ability to read and write a large number of file formats.
• A simple, elegant and easy to use Applications Programming Interface.
• Usable on Unix, Win32, MacOS and others.
• On the fly format conversion, including endian-ness swapping, type conversion and bitwidth scaling.
• Optional normalisation when reading floating point data from files containing integer data.
• Ability to open files in read/write mode.
• The ability to write the file header without closing the file (only on files open for write or read/write).
• Ability to query the library about all supported formats and retrieve text strings describing each format.

libsndfile has a comprehensive test suite so that each release is as bug free as possible. When new bugs are found, new tests are added to the test suite to ensure that these bugs don’t creep back into the code. When new features are added, tests are added to the test suite to make sure that these features continue to work correctly even when they are old features.

History

My first attempt at reading and writing WAV files was in 1990 or so under Windows 3.1. I started using Linux in early 1995 and contributed some code to the wavplay program. That contributed code would eventually mutate into this library. As one of my interests is Digital Signal Processing (DSP) I decided that as well as reading data from an audio file in the native format (typically 16 bit short integers) it would also be useful to be able to have the library do the conversion to floating point numbers for DSP applications. It then dawned on me that whatever file format (anything from 8 bit unsigned chars, to 32 bit floating point numbers) the library should be able to convert the data to whatever format the library user wishes to use it in. For example, in a sound playback program, the library caller typically wants the sound data in 16 bit short integers to dump into a sound card even though the data in the file may be 32 bit floating point numbers (ie Microsoft’s WAVE_FORMAT_IEEE_FLOAT format). Another example would be someone doing speech recognition research who has recorded some speech as a 16 bit WAV file but wants to process it as double precision floating point numbers.

Here is the release history for libsndfile:

• Version 0.0.8 (Feb 15 1999) First official release.
• Version 0.0.28 (Apr 26 2002) Final release of version 0 of libsndfile.
• Version 1.0.0rc1 (Jun 24 2002) Release candidate 1 of version 1 of libsndfile.
• Version 1.0.0rc6 (Aug 14 2002) MacOS 9 fixes.
• Version 1.0.0 (Aug 16 2002) First 1.0.X release.
• Version 1.0.1 (Sep 14 2002) Added MAT4 and MAT5 file formats.
• Version 1.0.2 (Nov 24 2002) Added VOX ADPCM format.
• Version 1.0.3 (Dec 09 2002) Fixes for Linux on ia64 CPUs.
• Version 1.0.4 (Feb 02 2003) New file formats and functionality.
• Version 1.0.5 (May 03 2003) One new file format and new functionality.
• Version 1.0.6 (Feb 08 2004) Large file fix for Linux/Solaris, new functionality and Win32 improvements.
• Version 1.0.7 (Feb 24 2004) Fix build problems on MacOS X and fix ia64/MIPS etc clip mode detection.
• Version 1.0.8 (Mar 14 2004) Minor bug fixes.
• Version 1.0.9 (Mar 30 2004) Add AVR format. Improve handling of some WAV files.
• Version 1.0.10 (Jun 15 2004) Minor bug fixes. Fix support for Win32 MinGW compiler.
• Version 1.0.11 (Nov 15 2004) Add SD2 file support, reading of loop data in WAV and AIFF. Minor bug fixes.
• Version 1.0.12 (Sep 30 2005) Add FLAC and CAF file support, virtual I/O interface. Minor bug fixes and cleanups.
• Version 1.0.13 (Jan 21 2006) Add read/write of instrument chunks. Minor bug fixes.
• Version 1.0.14 (Feb 19 2006) Minor bug fixes. Start shipping windows binary/source ZIP.
• Version 1.0.15 (Mar 16 2006) Minor bug fixes.
• Version 1.0.16 (Apr 30 2006) Add support for RIFX. Other minor feature enhancements and bug fixes.
• Version 1.0.17 (Aug 31 2006) Add C++ wrapper sndfile.hh. Minor bug fixes and cleanups.
• Version 1.0.18 (Feb 07 2009) Add Ogg/Vorbis support, remove captive libraries, many new features and bug fixes. Generate Win32 and Win64 pre-compiled binaries.
• Version 1.0.19 (Mar 02 2009) Fix for CVE-2009-0186. Huge number of minor fixes as a result of static analysis.
• Version 1.0.20 (May 14 2009) Fix for potential heap overflow.
• Version 1.0.21 (December 13 2009) Bunch of minor bug fixes.
• Version 1.0.22 (October 04 2010) Bunch of minor bug fixes.
• Version 1.0.23 (October 10 2010) Minor bug fixes.
• Version 1.0.24 (March 23 2011) Minor bug fixes.
• Version 1.0.25 (July 13 2011) Fix for Secunia Advisory SA45125. Minor bug fixes and improvements.
• Version 1.0.26 (November 22 2015) Fix for CVE-2014-9496, CVE-2014-9756 and CVE-2015-7805. Add ALAC/CAF support. Minor bug fixes and improvements.
• Version 1.0.27 (June 19 2016) Fix a seek regression in 1.0.26. Add metadata read/write for CAF and RF64. FIx PAF endian-ness issue.
• Version 1.0.28 (April 2 2017) Fix buffer overruns in FLAC and ID3 handling code. Reduce default header memory requirements. Fix detection of Large File Support for 32 bit systems.
• Version 1.0.29 (August 15 2020) Opus support, build system improvements and bug fixes.
• Version 1.0.30 (September 19 2020) Bugfix release. Fix file descriptor leaks in sf_open_fd () function. Fix critical CMake bug leading to broken ABI on Linux platforms. Other numerous fixes to CMake build system, consider it stable now. Fix some memory leaks. Fix handling of some SD2 files. Update documentation. Integrate GitHub Actions for faster test builds and Oss-Fuzz for fuzzing tests. Move sndfile.h.in from src/ to include/ directory. To avoid problems, delete old generated sndfile.h from $(top_builddir)/src.
• Version 1.0.31 (January 24 2021) Bugfix release. Fix multiple memory leaks reported by OSS-Fuzz. More SSE2-optimized functions for x86 and amd64.
• Version 1.1.0 (March 27 2022) Minor release, backward compatible with previous releases. Added long-awaited MP3 support. Numerous improvements and bugfixes.
• Version 1.2.0 (December 25 2022) Various bugfixes, removed artificial samplerate limit
• Version 1.2.1 (August 12 2023) Patch release, various bugfixes.
• Version 1.2.2 (August 13 2023) Patch release, various bugfixes.

Similar or Related Projects

• SoX is a program for converting between sound file formats.
• Wavplay started out as a minimal WAV file player under Linux and has mutated into Gnuwave, a client/server application for more general multimedia and games sound playback.
• Audiofile (libaudiofile) is a library similar to libsndfile but with a different programming interface. The author Michael Pruett has set out to clone (and fix some bugs in) the libaudiofile library which ships with SGI’s IRIX OS.
• sndlib.tar.gz is another library written by Bill Schottstaedt of CCRMA.

Licensing

libsndfile is released under the terms of the GNU Lesser General Public License, of which there are two versions; version 2.1 and version 3. To maximise the compatibility of libsndfile, the user may choose to use libsndfile under either of the above two licenses. You can also read a simple explanation of the ideas behind the GPL and the LGPL here.

You can use libsndfile with Free Software, Open Source, proprietary, shareware or other closed source applications as long as libsndfile is used as a dynamically loaded library and you abide by a small number of other conditions (read the LGPL for more info). With applications released under the GNU GPL you can also use libsndfile statically linked to your application.

I would like to see libsndfile used as widely as possible but I would prefer it if you released software that uses libsndfile as Free Software or Open Source. However, if you put in a great deal of effort building a significant application which simply uses libsndfile for file I/O, then I have no problem with you releasing that as closed source and charging as much money as you want for it as long as you abide by the license.

Download

Check latest version on GitHub Releases page.

Binaries and source packages are signed by current releaser David Seifert aka @SoapGentoo. You can verify signatures with his public GPG key:

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See Also

• sndfile-tools: a small collection of programs which use libsndfile.