Library for audio resampling

Question

In an embedded (Windows CE) C++ project, I have to resample an arbitrary sample-rate down (or up) to 44100 Hz.

Is there a free and portable C/C++ library for audio resampling?

Answer 1

This page lists a bunch of options.

Formatted exert, for the records. Please check out the above link for important details and licence information:

• libresample and sndfile-resample (from libsamplerate) (in the Planet CCRMA Distribution).
• libsoxr, the SoX resampler library
• ssrc (from Shibatch)
• There is a project combining ssrc and sox
• New in 2016 is a Python (Cython) implementation: resampy
• Brick (on Github).
• Smarc, available as a command-line program or C library.
• The resample software package contains free sampling-rate conversion and filter design utilities written in C.
  • Older Version for NeXT Computers.
  • Original 1983+ source for the PDP KL-10.
• Erik de Castro Lopo's "SecretRabbitCode" libsamplerate

• libresample based on `resample-1.7P

• libresample4j is a Java port of libresample.

• Open Source Audio Library Project (OSALP) contains a C++ class based on resample.
• The Speex speech coder/decoder.
• More at another large list of implementations and their relative performance.

Answer 2

Here's a code example using FFMpeg (avcodec) directly from C:

http://tdistler.com/2010/07/22/audio-resampling-using-ffmpeg-avcodec