openharmony/third_party_libsnd
1
0
Fork 0
mirror of https://gitee.com/openharmony/third_party_libsnd synced 2024-11-27 12:00:51 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

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

Browse Source
This commit is contained in:
Erik de Castro Lopo 2005-12-31 03:14:24 +00:00
parent ba42ebbeb0
commit e07ff14834
1 changed files with 39 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
doc/FAQ.html
View File

@ -41,6 +41,8 @@
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>
<!-- ========================================================================= -->
@ -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>