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diff --git a/lib/libsamplerate/libsamplerate-0.2.2/docs/index.md b/lib/libsamplerate/libsamplerate-0.2.2/docs/index.md new file mode 100755 index 00000000..4546d7bd --- /dev/null +++ b/lib/libsamplerate/libsamplerate-0.2.2/docs/index.md @@ -0,0 +1,160 @@ +--- +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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