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Current libsamplerate source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:24:45 +0100
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cannam@126 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
cannam@126 2 <HTML>
cannam@126 3
cannam@126 4 <HEAD>
cannam@126 5 <TITLE>
cannam@126 6 Secret Rabbit Code (aka libsamplerate)
cannam@126 7 </TITLE>
cannam@126 8 <META NAME="Author" CONTENT="Erik de Castro Lopo (erikd AT mega-nerd DOT com)">
cannam@126 9 <META NAME="Version" CONTENT="libsamplerate-0.1.8">
cannam@126 10 <META NAME="Description" CONTENT="The Secret Rabbit Code Home Page">
cannam@126 11 <META NAME="Keywords" CONTENT="libsamplerate sound resample audio dsp Linux">
cannam@126 12 <LINK REL=StyleSheet HREF="SRC.css" TYPE="text/css" MEDIA="all">
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cannam@126 14
cannam@126 15 <BODY TEXT="#FFFFFF" BGCOLOR="#000000" LINK="#FB1465" VLINK="#FB1465" ALINK="#FB1465">
cannam@126 16 <!-- pepper -->
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cannam@126 21 <BR>
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cannam@126 23 <TABLE ALIGN="center" WIDTH="98%">
cannam@126 24 <TR>
cannam@126 25 <TD VALIGN="top">
cannam@126 26 <BR>
cannam@126 27 <DIV CLASS="nav">
cannam@126 28 <BR>
cannam@126 29 <A HREF="index.html">Home</A><BR>
cannam@126 30 <A HREF="license.html">License</A><BR>
cannam@126 31 <A HREF="history.html">History</A><BR>
cannam@126 32 <A HREF="download.html">Download</A><BR>
cannam@126 33 <A HREF="quality.html">Quality</A><BR>
cannam@126 34 <A HREF="api.html">API</A><BR>
cannam@126 35 <A HREF="bugs.html">Bug Reporting</A><BR>
cannam@126 36 <A HREF="win32.html">On Win32</A><BR>
cannam@126 37 <A HREF="faq.html">FAQ</A><BR>
cannam@126 38 <A HREF="lists.html">Mailing Lists</A><BR>
cannam@126 39 <A HREF="ChangeLog">ChangeLog</A><BR>
cannam@126 40 <BR>
cannam@126 41 <DIV CLASS="block">
cannam@126 42 Author :<BR>Erik de Castro Lopo
cannam@126 43 <!-- pepper -->
cannam@126 44 <BR><BR>
cannam@126 45 <!-- pepper -->
cannam@126 46
cannam@126 47 </DIV>
cannam@126 48 <IMG SRC=
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cannam@126 50 HEIGHT=30 WIDTH=100 ALT="counter.gif">
cannam@126 51 </DIV>
cannam@126 52
cannam@126 53 </TD>
cannam@126 54 <!-- pepper -->
cannam@126 55 <!-- ######################################################################## -->
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cannam@126 57 <TD VALIGN="top">
cannam@126 58 <DIV CLASS="block">
cannam@126 59 <BR>
cannam@126 60
cannam@126 61 <TABLE ALIGN="center" WIDTH="80%">
cannam@126 62 <TR><TD>
cannam@126 63 <P>
cannam@126 64 <I>
cannam@126 65 "Choosing a sample rate coverter wasn't easy. We ran numerous tests with
cannam@126 66 Secret Rabbit Code and other sample rate converters, then compared them all.
cannam@126 67 In the end, SRC outperformed the others, including some extremely well known
cannam@126 68 and popular software. We had one issue with SRC, but after emailing Erik, he
cannam@126 69 got back to us immediately with an answer. Choosing SRC was a no brainer."
cannam@126 70 </I><BR>
cannam@126 71 Ryan Smith, International Marketing Manager, <BR>
cannam@126 72 <A HREF="http://emersys.co.kr/">Emersys Corp.</A>, South Korea.<BR>
cannam@126 73 Product : <A HREF="http://maven3d.com">Maven3D</A>
cannam@126 74
cannam@126 75 </P>
cannam@126 76 </TD></TR>
cannam@126 77 </TABLE>
cannam@126 78 <P>
cannam@126 79 <B>S</B>ecret <B>R</B>abbit <B>C</B>ode (aka libsamplerate) is a
cannam@126 80 <B>S</B>ample <B>R</B>ate <B>C</B>onverter for audio.
cannam@126 81 One example of where such a thing would be useful is converting audio
cannam@126 82 from the CD sample rate of 44.1kHz to the 48kHz sample rate used by
cannam@126 83 DAT players.
cannam@126 84 </P>
cannam@126 85 <!-- pepper -->
cannam@126 86 <P>
cannam@126 87 <B>SRC</B> is capable of arbitrary and time varying conversions ; from
cannam@126 88 downsampling by a factor of 256 to upsampling by the same factor.
cannam@126 89 Arbitrary in this case means that the ratio of input and output
cannam@126 90 sample rates can be an irrational number.
cannam@126 91 The conversion ratio can also vary with time for speeding up and slowing
cannam@126 92 down effects.
cannam@126 93 </P>
cannam@126 94 <!-- pepper -->
cannam@126 95 <P>
cannam@126 96 <B>SRC</B> provides a small set of converters to allow quality to
cannam@126 97 be traded off against computation cost.
cannam@126 98 The current best converter provides a signal-to-noise ratio of 145dB
cannam@126 99 with -3dB passband extending from DC to 96&#37; of the theoretical
cannam@126 100 best bandwidth for a given pair of input and output sample rates.
cannam@126 101 </P>
cannam@126 102 <!-- pepper -->
cannam@126 103 <P>
cannam@126 104 Since the library has few dependencies beyond that provided by the
cannam@126 105 standard C library, it should compile and work on just about any
cannam@126 106 operating system.
cannam@126 107 It is known to work on Linux, MacOSX,
cannam@126 108 <A HREF="win32.html">Win32</A>
cannam@126 109 and Solaris.
cannam@126 110 With some relatively minor hacking it should also be relatively easy
cannam@126 111 to port it to embedded systems and digital signal processors.
cannam@126 112 </P>
cannam@126 113 <!-- pepper -->
cannam@126 114 <P>
cannam@126 115 In addition, the library comes with a comprehensive test suite which
cannam@126 116 can validate the performance of the library on new platforms.
cannam@126 117 </P>
cannam@126 118
cannam@126 119 <!-- pepper -->
cannam@126 120 <!-- <A HREF="mailto:aldel0305@mega-nerd.com">For the spam bots</A> -->
cannam@126 121 <!-- pepper -->
cannam@126 122
cannam@126 123 </DIV>
cannam@126 124 </TD></TR>
cannam@126 125 </TABLE>
cannam@126 126
cannam@126 127 </BODY>
cannam@126 128 </HTML>
cannam@126 129