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libsndfile
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<META NAME="Author" CONTENT="Erik de Castro Lopo (erikd AT mega-nerd DOT com)">
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<META NAME="Description" CONTENT="The libsndfile Home Page">
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<META NAME="Keywords" CONTENT="WAV AIFF AU SVX PAF NIST W64 libsndfile sound audio dsp Linux">
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</CENTER>
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Libsndfile is a C library for reading and writing files containing sampled sound
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(such as MS Windows WAV and the Apple/SGI AIFF format) through one standard
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library interface. It is released in source code format under the
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Gnu Lesser General Public License.
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The library was written to compile and run on a Linux system but should compile
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and run on just about any Unix (including MacOS X).
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There are also pre-compiled binaries available for 32 and 64 bit windows.
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It was designed to handle both little-endian (such as WAV) and big-endian
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(such as AIFF) data, and to compile and run correctly on little-endian (such as Intel
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and DEC/Compaq Alpha) processor systems as well as big-endian processor systems such
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as Motorola 68k, Power PC, MIPS and Sparc.
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Hopefully the design of the library will also make it easy to extend for reading and
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writing new sound file formats.
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It has been compiled and tested (at one time or another) on the following systems:
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Every platform supported by Debian GNU/Linux including x86_64-linux-gnu,
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i486-linux-gnu, powerpc-linux-gnu, sparc-linux-gnu, alpha-linux-gnu,
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mips-linux-gnu and armel-linux-gnu.
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powerpc-apple-darwin7.0 (Mac OS X 10.3)
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sparc-sun-solaris2.8 (using gcc)
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mips-sgi-irix5.3 (using gcc)
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QNX 6.0
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i386-unknown-openbsd2.9
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At the moment, each new release is being tested on i386 Linux, x86_64 Linux,
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PowerPC Linux, Win32 and Win64.
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Features
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libsndfile has the following main features :
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Ability to read and write a large number of file formats.
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A simple, elegant and easy to use Applications Programming Interface.
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Usable on Unix, Win32, MacOS and others.
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On the fly format conversion, including endian-ness swapping, type conversion
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and bitwidth scaling.
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Optional normalisation when reading floating point data from files containing
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integer data.
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Ability to open files in read/write mode.
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The ability to write the file header without closing the file (only on files
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open for write or read/write).
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Ability to query the library about all supported formats and retrieve text
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strings describing each format.
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libsndfile has a comprehensive test suite so that each release is as bug free
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as possible.
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When new bugs are found, new tests are added to the test suite to ensure that
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these bugs don't creep back into the code.
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When new features are added, tests are added to the test suite to make sure that
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these features continue to work correctly even when they are old features.
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The following table lists the file formats and encodings that libsndfile can read
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and write.
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The file formats are arranged across the top and encodings along the left
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edge.
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Micro- soft
WAV
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SGI / Apple
AIFF / AIFC
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Sun / DEC /
NeXT
AU / SND
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Header- less
RAW
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Paris Audio
File
PAF
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Commo- dore
Amiga
IFF / SVX
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Sphere
Nist
WAV
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IRCAM
SF
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Creative
VOC
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Sound forge
W64
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GNU Octave 2.0
MAT4
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GNU Octave 2.1
MAT5
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Portable Voice Format
PVF
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Fasttracker 2
XI
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HMM Tool Kit
HTK
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Apple
CAF
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Sound
Designer II
SD2
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Free Lossless Audio Codec
FLAC
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Unsigned 8 bit PCM
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R/WR/W R/W
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R/W
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R/W R/W
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Signed 8 bit PCM
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R/WR/WR/W
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R/WR/WR/W
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R/W
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R/WR/WR/W
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Signed 16 bit PCM
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R/WR/WR/WR/W
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R/WR/WR/WR/W
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R/WR/WR/WR/W
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R/W R/WR/W
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R/WR/W
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Signed 24 bit PCM
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R/WR/WR/WR/W
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R/W R/WR/W
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R/W
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R/WR/WR/W
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Signed 32 bit PCM
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R/WR/WR/WR/W
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R/WR/W
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R/WR/WR/WR/W
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R/W
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32 bit float
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R/WR/WR/WR/W
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R/W
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R/WR/WR/W
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R/W
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64 bit double
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R/WR/WR/W
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R/W
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R/WR/WR/W
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R/W
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u-law encoding
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R/WR/WR/WR/W
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R/WR/WR/W
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R/W
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R/W
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A-law encoding
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R/WR/WR/WR/W
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R/WR/WR/W
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R/W
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R/W
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IMA ADPCM
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R/W
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R/W
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MS ADPCM
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R/W
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R/W
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GSM 6.10
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R/WR/W R/W
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R/W
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G721 ADPCM 32kbps
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R/W R/W
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G723 ADPCM 24kbps
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R/W
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G723 ADPCM 40kbps
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R/W
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12 bit DWVW
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R/W R/W
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16 bit DWVW
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R/W R/W
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24 bit DWVW
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R/W R/W
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Ok Dialogic ADPCM
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R/W
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8 bit DPCM
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R/W
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16 bit DPCM
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R/W
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From version 1.0.18, libsndfile also reads and writes
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FLAC
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and
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Ogg/Vorbis.
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Some of the file formats I am also interested in adding are:
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Kurzweil K2000 sampler files.
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Ogg Speex.
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I have decided that I will not be adding support for MPEG Layer 3 (commonly
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known as MP3) due to the patent issues surrounding this file format.
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See
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the FAQ
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for more.
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Other file formats may also be added on request.
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History
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My first attempt at reading and writing WAV files was in 1990 or so under Windows
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3.1.
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I started using Linux in early 1995 and contributed some code to the
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wavplay
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program.
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That contributed code would eventually mutate into this library.
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As one of my interests is Digital Signal Processing (DSP) I decided that as well as
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reading data from an audio file in the native format (typically 16 bit short integers)
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it would also be useful to be able to have the library do the conversion to floating
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point numbers for DSP applications.
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It then dawned on me that whatever file format (anything from 8 bit unsigned chars,
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to 32 bit floating point numbers) the library should be able to convert the data to
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whatever format the library user wishes to use it in.
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For example, in a sound playback program, the library caller typically wants the sound
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data in 16 bit short integers to dump into a sound card even though the data in the
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file may be 32 bit floating point numbers (ie Microsoft's WAVE_FORMAT_IEEE_FLOAT
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format).
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Another example would be someone doing speech recognition research who has recorded
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some speech as a 16 bit WAV file but wants to process it as double precision floating
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point numbers.
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Here is the release history for libsndfile :
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Version 0.0.8 (Feb 15 1999) First official release.
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Version 0.0.28 (Apr 26 2002) Final release of version 0 of libsndfile.
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Version 1.0.0rc1 (Jun 24 2002) Release candidate 1 of version 1 of libsndfile.
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Version 1.0.0rc6 (Aug 14 2002) MacOS 9 fixes.
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Version 1.0.0 (Aug 16 2002) First 1.0.X release.
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Version 1.0.1 (Sep 14 2002) Added MAT4 and MAT5 file formats.
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Version 1.0.2 (Nov 24 2002) Added VOX ADPCM format.
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Version 1.0.3 (Dec 09 2002) Fixes for Linux on ia64 CPUs.
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Version 1.0.4 (Feb 02 2003) New file formats and functionality.
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Version 1.0.5 (May 03 2003) One new file format and new functionality.
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Version 1.0.6 (Feb 08 2004) Large file fix for Linux/Solaris, new functionality
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and Win32 improvements.
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Version 1.0.7 (Feb 24 2004) Fix build problems on MacOS X and fix ia64/MIPS etc
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clip mode detction.
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Version 1.0.8 (Mar 14 2004) Minor bug fixes.
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Version 1.0.9 (Mar 30 2004) Add AVR format. Improve handling of some WAV files.
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Version 1.0.10 (Jun 15 2004) Minor bug fixes. Fix support for Win32 MinGW compiler.
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Version 1.0.11 (Nov 15 2004) Add SD2 file support, reading of loop data in WAV and AIFF.
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Minor bug fixes.
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Version 1.0.12 (Sep 30 2005) Add FLAC and CAF file support, virtual I/O interface.
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Minor bug fixes and cleanups.
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Version 1.0.13 (Jan 21 2006) Add read/write of instrument chunks. Minor bug fixes.
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Version 1.0.14 (Feb 19 2006) Minor bug fixes. Start shipping windows binary/source ZIP.
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Version 1.0.15 (Mar 16 2006) Minor bug fixes.
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Version 1.0.16 (Apr 30 2006) Add support for RIFX. Other minor feature enhancements and
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bug fixes.
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Version 1.0.17 (Aug 31 2006) Add C++ wrapper sndfile.hh. Minor bug fixes and cleanups.
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Version 1.0.18 (Feb 07 2009) Add Ogg/Vorbis suppport, remove captive libraries, many
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new features and bug fixes. Generate Win32 and Win64 pre-compiled binaries.
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Version 1.0.19 (Mar 02 2009) Fix for CVE-2009-0186. Huge number of minor fixes as a
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result of static analysis.
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Version 1.0.20 (May 14 2009) Fix for potential heap overflow.
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Version 1.0.21 (December 13 2009) Bunch of minor bug fixes.
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Version 1.0.22 (October 04 2010) Bunch of minor bug fixes.
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Version 1.0.23 (October 10 2010) Minor bug fixes.
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Version 1.0.24 (March 23 2011) Minor bug fixes.
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Version 1.0.25 (July 13 2011) Fix for Secunia Advisory SA45125. Minor bug fixes and
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improvements.
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Version 1.0.26 (November 22 2015) Fix for CVE-2014-9496, CVE-2014-9756 and CVE-2015-7805.
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Add ALAC/CAF support. Minor bug fixes and improvements.
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Version 1.0.27 (June 19 2016) Fix a seek regression in 1.0.26. Add metadata read/write
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for CAF and RF64. FIx PAF endian-ness issue.
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Version 1.0.28 (April 2 2017) Fix buffer overruns in FLAC and ID3 handling code. Reduce default
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header memory requirements. Fix detection of Large File Support for 32 bit systems.
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Similar or Related Projects
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SoX is a program for
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converting between sound file formats.
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Wavplay started out
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as a minimal WAV file player under Linux and has mutated into Gnuwave, a client/server
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application for more general multimedia and games sound playback.
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Audiofile (libaudiofile) is
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a library similar to libsndfile but with a different programming interface. The
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author Michael Pruett has set out to clone (and fix some bugs in) the libaudiofile
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library which ships with SGI's IRIX OS.
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sndlib.tar.gz is
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another library written by Bill Schottstaedt of CCRMA.
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Licensing
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libsndfile is released under the terms of the GNU Lesser General Public License,
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of which there are two versions;
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version 2.1
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and
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version 3.
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To maximise the compatibility of libsndfile, the user may choose to use libsndfile
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under either of the above two licenses.
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You can also read a simple explanation of the ideas behind the GPL and the LGPL
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here.
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You can use libsndfile with
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Free Software,
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Open Source,
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proprietary, shareware or other closed source applications as long as libsndfile
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is used as a dynamically loaded library and you abide by a small number of other
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conditions (read the LGPL for more info).
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With applications released under the GNU GPL you can also use libsndfile statically
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linked to your application.
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I would like to see libsndfile used as widely as possible but I would prefer it
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if you released software that uses libsndfile as
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Free Software
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or
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Open Source.
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However, if you put in a great deal of effort building a significant application
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which simply uses libsndfile for file I/O, then I have no problem with you releasing
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that as closed source and charging as much money as you want for it as long as you
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abide by the license.
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Download
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Here is the latest version. It is available in the following formats:
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Source code as a .tar.gz :
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libsndfile-1.0.28.tar.gz
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and
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GPG signature.
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Win32 installer:
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libsndfile-1.0.28-w32-setup.exe (thoroughly tested under
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Wine)
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and
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GPG signature.
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Win64 installer:
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libsndfile-1.0.28-w64-setup.exe (thoroughly tested under
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Wine)
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and
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GPG signature.
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The GPG signature can be validated at
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Keybase.IO.
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The Win32 installer should work on Windows Vista or later.
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Pre-release versions of libsndfile are available
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here
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and are announced on the
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libsndfile-devel
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mailing list.
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See Also
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sndfile-tools
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: a small collection of programs which use libsndfile.
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The latest version of this document can be found
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here.
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Author :
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Erik de Castro Lopo
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This page has been accessed
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"/cgi-bin/Count.cgi?ft=6|frgb=55;55;55|tr=0|trgb=0;0;0|wxh=15;20|md=7|dd=B|st=1|sh=1|df=libsndfile.dat"
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HEIGHT=30 WIDTH=100 ALT="counter.gif">
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times.
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</BODY>
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</HTML>
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