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https://github.com/cookiengineer/audacity
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Update libsndfile to 1.0.29pre2+git
This pulls in MANY (over 890) changes compared to our from our current 1.0.24 version.
This commit is contained in:
Leland Lucius
@@ -26,7 +26,8 @@
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<A HREF="#Q006">Q6 : What's the best format for storing temporary files?</A><BR/>
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<A HREF="#Q007">Q7 : On Linux/Unix/MacOS X, what's the best way of detecting the
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presence of libsndfile?</A><BR/>
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<A HREF="#Q008">Q8 : But I just want a simple Makefile! What do I do?</A><BR/>
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<A HREF="#Q008">Q8 : I have libsndfile installed and now I want to use it. I
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just want a simple Makefile! What do I do?</A><BR/>
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<A HREF="#Q009">Q9 : How about adding the ability to write/read sound files to/from
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memory buffers?</A><BR/>
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<A HREF="#Q010">Q10 : Reading a 16 bit PCM file as normalised floats and then
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@@ -49,8 +50,7 @@
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<A HREF="#Q019">Q19 : I have project files for Visual Studio / XCode / Whatever. Why
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don't you distribute them with libsndfile?
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</A><BR/>
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<A HREF="#Q020">Q20 : Why doesn't libsndfile support MP3? Lots of other Open Source
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projects support it!
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<A HREF="#Q020">Q20 : Why doesn't libsndfile support MP3?
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</A><BR/>
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<A HREF="#Q021">Q21 : How do I use libsndfile in a closed source or commercial program
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and comply with the license?
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@@ -95,7 +95,7 @@ If you can't find either then the answer is no.
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</UL>
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<P>
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As documented
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<A HREF="http://www.mega-nerd.com/libsndfile/api.html#note1">here</A>
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<A HREF="api.html#note1">here</A>
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there is now a well defined behaviour which ensures that no matter what the
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bit width of the source file, the scaling always does something sensible.
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This makes it safe to read 8, 16, 24 and 32 bit PCM files using sf_read_short()
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@@ -116,7 +116,7 @@ case.
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<P>
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To fix this I suggest that you install the GNU Bash shell, rename /bin/sh to
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/bin/sh.old and make a symlink from /bin/sh to the bash shell.
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Bash is designed to behave as a Bourne shell when is is called as /bin/sh.
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Bash is designed to behave as a Bourne shell when it is called as /bin/sh.
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</P>
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<P>
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When I did this on my iBook running MacOS X, compile times dropped from 13 minutes
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@@ -133,7 +133,7 @@ It seems that the Solaris Bourne shell disagrees with GNU libtool.
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<P>
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To fix this I suggest that you install the GNU Bash shell, rename /bin/sh to
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/bin/sh.old and make a symlink from /bin/sh to the bash shell.
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Bash is designed to behave as a Bourne shell when is is called as /bin/sh.
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Bash is designed to behave as a Bourne shell when it is called as /bin/sh.
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</P>
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<!-- ========================================================================= -->
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@@ -246,7 +246,8 @@ libsndfile configure process. For instance on my system I get this:
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<!-- ========================================================================= -->
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<A NAME="Q008"></A>
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<H2><BR/><B>Q8 : But I just want a simple Makefile! What do I do?</B></H2>
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<H2><BR/><B>Q8 : I have libsndfile installed and now I want to use it. I just want
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a simple Makefile! What do I do?</B></H2>
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<P>
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The <B>pkg-config</B> program makes finding the correct compiler flag values and
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@@ -339,7 +340,7 @@ other than normalized floats in the application.
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Alternatives to normalized floats are the <b>short</b> and <b>int</b> data
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types (ie using sf_read_short or sf_read_int) or using un-normalized floats
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(see
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<a href="http://www.mega-nerd.com/libsndfile/command.html#SFC_SET_NORM_FLOAT">
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<a href="command.html#SFC_SET_NORM_FLOAT">
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SFC_SET_NORM_FLOAT</a>).
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</P>
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<P>
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@@ -389,11 +390,12 @@ is the risk of breaking something that currently works.
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</B></H2>
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<P>
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An <tt>item</tt>tt> is a single sample of the data type you are reading; ie a
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An <tt>item</tt> is a single sample of the data type you are reading; ie a
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single <tt>short</tt> value for <tt>sf_read_short</tt> or a single <tt>float</tt>
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for <tt>sf_read_float</tt>.
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</P>
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<P>
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For a sound file with only one channel, a frame is the same as a item (ie a
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single sample) while for multi channel sound files, a single frame contains a
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single item for each channel.
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@@ -412,7 +414,7 @@ on a stereo file, first using items:
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</PRE>
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<P>
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and now readng the exact same amount of data using frames:
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and now reading the exact same amount of data using frames:
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</P>
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<PRE>
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@@ -640,7 +642,7 @@ CPU and run them on the other, the test suite will fail.
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</P>
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<P>
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Part of the problem is the the CPU endian-ness is detected at configure time.
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Part of the problem is that the CPU endian-ness is detected at configure time.
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Yes, I know the Apple compiler defines one of the macros __LITTLE_ENDIAN__
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and __BIG_ENDIAN__, but those macros are not part of the 1999 ISO C Standard
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and they are not portable.
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@@ -726,42 +728,18 @@ Hence, I'm not willing to enter into an arrangement like that again.
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<!-- ========================================================================= -->
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<A NAME="Q020"></A>
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<H2><BR/><B>Q20 : Why doesn't libsndfile support MP3? Lots of other Open Source
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projects support it!
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<H2><BR/><B>Q20 : Why doesn't libsndfile support MP3?
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</B></H2>
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<P>
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MP3 is not supported for one very good reason; doing so requires the payment
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of licensing fees.
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As can be seen from
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<a href="http://www.mp3licensing.com/royalty/software.html">
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mp3licensing.com</a>
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the required royalty payments are not cheap.
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In the past, MP3 was not supported because the technology behind MP3 was
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patented.
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Those patents have now expired and there is an
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<a href="https://github.com/erikd/libsndfile/issues/258">
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open ticket</a>
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to implement MP3 support.
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</P>
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<p>
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Yes, I know other libraries ignore the licensing requirements, but their legal
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status is extremely dubious.
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At any time, the body selling the licenses could go after the authors of those
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libraries.
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Some of those authors may be students and hence wouldn't be worth pursuing.
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</P>
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<p>
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However, libsndfile is released under the name of a company, Mega Nerd Pty Ltd;
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a company which has income from from libsamplerate licensing, libsndfile based
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consulting income and other unrelated consulting income.
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Adding MP3 support to libsndfile could place that income would be under legal
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threat.
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</p>
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<p>
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Fortunately, Ogg Vorbis exists as an alternative to MP3.
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Support for Ogg Vorbis was added to libsndfile (mostly due to the efforts of
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John ffitch of the Csound project) in version 1.0.18.
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</p>
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<!-- ========================================================================= -->
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<A NAME="Q021"></A>
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<H2><BR/><B>Q21 : How do I use libsndfile in a closed source or commercial program
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@@ -842,7 +820,7 @@ the top level of the extracted tarball.
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<A HREF="http://www.mega-nerd.com/libsndfile/">
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http://www.mega-nerd.com/libsndfile/</A>.
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<BR/>
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Version : 1.0.24
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Version : 1.0.28
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</P>
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</BODY>
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