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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.


v1.2.4 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 ..

If you want the git version, run simply:

git clone 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.

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