--- layout: default title: Libsamplerate home page --- {: .indent_block} *"Choosing a sample rate coverter wasn't easy. We ran numerous tests with Secret Rabbit Code and other sample rate converters, then compared them all. In the end, SRC outperformed the others, including some extremely well known and popular software. We had one issue with SRC, but after emailing Erik, he got back to us immediately with an answer. Choosing SRC was a no brainer."* Ryan Smith, International Marketing Manager, [Emersys Corp.](http://emersys.co.kr/), South Korea. Product : [Maven3D](http://maven3d.com) **S**ecret **R**abbit **C**ode (aka libsamplerate) is a **S**ample **R**ate **C**onverter for audio. One example of where such a thing would be useful is converting audio from the CD sample rate of 44.1kHz to the 48kHz sample rate used by DAT players. **SRC** is capable of arbitrary and time varying conversions, from downsampling by a factor of 256 to upsampling by the same factor. Arbitrary in this case means that the ratio of input and output sample rates can be an irrational number. The conversion ratio can also vary with time for speeding up and slowing down effects. **SRC** provides a small set of converters to allow quality to be traded off against computation cost. The current best converter provides a signal-to-noise ratio of 145dB with -3dB passband extending from DC to 96% of the theoretical best bandwidth for a given pair of input and output sample rates. Since the library has few dependencies beyond that provided by the standard C library, it should compile and work on just about any operating system. It is known to work on Linux, MacOSX, [Win32](win32.md) and Solaris. With some relatively minor hacking it should also be relatively easy to port it to embedded systems and digital signal processors. In addition, the library comes with a comprehensive test suite which can validate the performance of the library on new platforms. ## Download Check latest version on [GitHub Releases page](https://github.com/libsndfile/libsamplerate/releases). Binaries and source packages are signed by current release manager David Seifert aka @SoapGentoo. You can verify signatures with his public GPG key (`0xA47620E801E47E95`): ``` -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v2 mQINBFppABgBEAC42ZiNvV7BTIgR6TQy0YnF54fx3mVRP1u8Mq00UZa7reAsNKh7 1H60j0W4s6+4pVVIKGfpVGxLwUdJe+KVCYw1Cd3YW6uMf5zZrC/ZWqnJiH/n6S6o 1l4INII2o6YbGBnzIWBPRo7PlOL+mvgKTLpBSJPnhD8XDGN5wRiV8rL2+6Dptg0F nJt7oxECGF3OD3gk6HMel0o82CVkIqMtNaX1L/bhcdF7K0Rp2MXPZMmpn1izW5sI asN1G9+w+Zwj7kMJzq1Aw3ac+rsX4SEYdvXjS2QhDHQUIr6LXri3D2WbcEqIZj2R JVoVwblsrG11dYXFDBbgrq4NhgTBsxHYDlkr/qF2W+kbPC/nhSqTVZeCYvTBZbOQ +RqyN/I0izukglnWmV1jGijFA8snyP8efx732hw/24zRYmtXOtnEITUpw8WOeZCq 6uiHaQ+eopnY2ojBg9BI7WZm0AFn58xxT9soMsyFOUFgXTqaWFZWlJ3fhZE8/0v8 JEu/kPGE5aJReT3b34B+Bojkj74XR+h2u7iJJBHMTE8RwGoUOZHer/XsL9xlcdks I+7TCjiq++ShaSSt2XsJmw2BhREohrjW/2KkwmvT3b44RMpKPB4WTH+++aqJQNeM IqmswOMoZvzEZezInj7WVY/r0WEei1Y6wt1tBrJ/cFf1oQBM1UmphxcrfQARAQAB tB9EYXZpZCBTZWlmZXJ0IDxzb2FwQGdlbnRvby5vcmc+iQJUBBMBCgA+BQsJCAcD BRUKCQgLBRYCAwEAAh4BAheAAhsBFiEEMdlcq22A0mIkShdQpHYg6AHkfpUFAl/V 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