libebur128 is a library that implements the EBU R 128 standard for loudness normalisation.

All source code is licensed under the MIT license. See COPYING file for details.

See also loudness-scanner tool.

v1.2.6 released:

• Fix dynamic linking on Windows.

v1.2.5 released:

• Remove BUILD_STATIC_LIBS build option. Instead the CMake-supported BUILD_SHARED_LIBS option is now honored as expected.
• Various code cleanups, warning fixes and documentation improvements
• Fix issue related to filter state indexing with high channel enums (#77)
• Introduce limits for number of channels and maximum supported samplerate to avoid integer overflows
• Fix error return code of ebur128_set_channel. The actual behavior is now aligned to the documentation (#90).

v1.2.4 released:

• Fix broken ebur128_loudness_global_multiple() function. Since v1.1.0 it calculated the relative threshold just from the last state given to it, resulting in wrong values.
• More tests
• Fix some minor build issues
• Fix uninitialized memory in ebur128_init(), possibly resulting in wrong values

v1.2.3 released:

• Fix uninitialized memory access during true peak scanning (bug #72)

v1.2.2 released (v1.2.1 was mistagged):

• Fix a null pointer dereference when doing true peak scanning of 192kHz data

v1.2.0 released:

• New functions for real time loudness/peak monitoring:
  • ebur128_loudness_window()
  • ebur128_set_max_window()
  • ebur128_set_max_history()
  • ebur128_prev_sample_peak()
  • ebur128_prev_true_peak()
• New FIR resampler for true peak calculation, removing Speex dependency
• Add true peak conformance tests
• Bug fixes

v1.1.0 released:

• Add ebur128_relative_threshold()
• Add channel definitions from ITU R-REC-BS 1770-4 to channel enum
• Fix some minor build issues

v1.0.3 released:

• Fix build with recent speexdsp
• Correct license file name
• CMake option to disable static library
• minimal-example.c: do not hard code program name in usage

• Portable ANSI C code
• Implements M, S and I modes
• Implements loudness range measurement (EBU - TECH 3342)
• True peak scanning
• Supports all samplerates by recalculation of the filter coefficients

In the root folder, type:

mkdir build
cd build
cmake ..
make

If you want the git version, run simply:

git clone git://github.com/jiixyj/libebur128.git

Library usage should be pretty straightforward. All exported symbols are documented in the ebur128.h header file. For a usage example, see minimal-example.c in the tests folder.

On some operating systems, static libraries should be compiled as position independent code. You can enable that by turning on WITH_STATIC_PIC.