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FAQ.html : Add "Can it read/write pipes".

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Erik de Castro Lopo 2005-12-31 03:14:24 +00:00
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41
doc/FAQ.html
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@ -41,17 +41,19 @@
Is this a bug in libsndfile?</A><BR>
<A HREF="#Q016">Q16 : Will you accept a fix for compiling libsndfile with compiler X?
</A><BR>
<A HREF="#Q017">Q17 : Can libsndfile read/write files from/to UNIX pipes?
</A><BR>
<HR>
<!-- ========================================================================= -->
<A NAME="Q001"></A>
<H2><BR><B>Q1 : Do you plan to support XYZ codec in libsnfile?</B></H2>
<P>
If source code for XYZ codec is available under a suitable license (LGPL, BSD,
If source code for XYZ codec is available under a suitable license (LGPL, BSD,
MIT etc) then yes, I'd like to add it.
</P>
<P>
If suitable documentation is available on how to decode and enocde the format
If suitable documentation is available on how to decode and enocde the format
then maybe, depending on how much work is involved.
</P>
<P>
@ -518,6 +520,41 @@ ISO C Standard.
This can make compiling libsndfile with some older compilers difficult.
</P>
<!-- ========================================================================= -->
<A NAME="Q017"></A>
<H2><BR><B>Q17 : Can libsndfile read/write files from/to UNIX pipes?
</B></H2>
<P>
Yes, libsndfile can read files from pipes.
Unfortunately, the write case is much more complicated.
</P>
<P>
File formats like AIFF and WAV have information at the start of the file (the
file header) which states the length of the file, the number of sample frames
etc.
This information must be filled in correctly when the file header is written,
but this information is not reliably known until the file is closed.
This means that libsndfile cannot write AIFF, WAV and many other file types
to a pipe.
</P>
<P>
However, there is at least one file format (AU) which is specifically designed
to be written to a pipe.
Like AIFF and WAV, AU has a header with a sample frames field, but it is
specifically allowable to set that frames field to 0x7FFFFFFF if the file
length is not known when the header is written.
The AU file format can also hold data in many of the standard formats (ie
SF_FORMAT_PCM_16, SF_FORMAT_PCM_24, SF_FORMAT_FLOAT etc) as well as allowing
data in both big and little endian format.
</P>
<P>
Sell also <A HREF="#Q006">FAQ Q6</A>.
</P>
<!-- ========================================================================= -->
<HR>
<P>