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author | Aki <please@ignore.pl> | 2021-10-01 23:46:47 +0200 |
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committer | Aki <please@ignore.pl> | 2021-10-01 23:46:47 +0200 |
commit | ddd76aa4e1571c8d5965709db5c3cd47a89c9a38 (patch) | |
tree | 4e07bfaebede6531a70984fdebc855bca52f394a /vorbis/doc/vorbisfile/ov_read_filter.html | |
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diff --git a/vorbis/doc/vorbisfile/ov_read_filter.html b/vorbis/doc/vorbisfile/ov_read_filter.html new file mode 100644 index 0000000..e3f2e84 --- /dev/null +++ b/vorbis/doc/vorbisfile/ov_read_filter.html @@ -0,0 +1,114 @@ +<html> + +<head> +<title>Vorbisfile - function - ov_read_filter</title> +<link rel=stylesheet href="style.css" type="text/css"> +</head> + +<body bgcolor=white text=black link="#5555ff" alink="#5555ff" vlink="#5555ff"> +<table border=0 width=100%> +<tr> +<td><p class=tiny>Vorbisfile documentation</p></td> +<td align=right><p class=tiny>vorbisfile version 1.3.2 - 20101101</p></td> +</tr> +</table> + +<h1>ov_read_filter()</h1> + +<p><i>declared in "vorbis/vorbisfile.h";</i></p> + +<p> + <tt>ov_read_filter()</tt> is a variant of <a + href="ov_read.html">ov_read()</a>, the main function used to decode + a Vorbis file within a loop. It passes the decoded floating point + PCM data to the filter specified in the function arguments before + converting the data to integer output samples. All other aspects of + its behavior are as with <a href="ov_read.html">ov_read()</a>. +<p> + +<br><br> +<table border=0 color=black cellspacing=0 cellpadding=7> +<tr bgcolor=#cccccc> + <td> +<pre><b> +long ov_read_filter(<a href="OggVorbis_File.html">OggVorbis_File</a> *vf, char *buffer, int length, int bigendianp, int word, int sgned, int *bitstream, + void (*filter)(float **pcm,long channels,long samples,void *filter_param),void *filter_param); +</b></pre> + </td> +</tr> +</table> + +<h3>Parameters</h3> +<dl> +<dt><i>vf</i></dt> +<dd>A pointer to the OggVorbis_File structure--this is used for ALL the externally visible libvorbisfile +functions.</dd> +<dt><i>buffer</i></dt> +<dd>A pointer to an output buffer. The decoded output is inserted into this buffer.</dd> +<dt><i>length</i></dt> +<dd>Number of bytes to be read into the buffer. Should be the same size as the buffer. A typical value is 4096.</dd> +<dt><i>bigendianp</i></dt> +<dd>Specifies big or little endian byte packing. 0 for little endian, 1 for b +ig endian. Typical value is 0.</dd> +<dt><i>word</i></dt> +<dd>Specifies word size. Possible arguments are 1 for 8-bit samples, or 2 or +16-bit samples. Typical value is 2.</dd> +<dt><i>sgned</i></dt> +<dd>Signed or unsigned data. 0 for unsigned, 1 for signed. Typically 1.</dd> +<dt><i>bitstream</i></dt> +<dd>A pointer to the number of the current logical bitstream.</dd> +<dt><i>filter</i></dt> +<dd>Filter function to process float PCM data prior to conversion to interleaved integer output.</dd> +<dt><i>filter_param</i></dt> +<dd>Data to pass through to the filter function.</dd> + +</dl> + + +<h3>Return Values</h3> +<blockquote> +<dl> +<dt>OV_HOLE</dt> + <dd>indicates there was an interruption in the data. + <br>(one of: garbage between pages, loss of sync followed by + recapture, or a corrupt page)</dd> +<dt>OV_EBADLINK</dt> + <dd>indicates that an invalid stream section was supplied to + libvorbisfile, or the requested link is corrupt.</dd> +<dt>0</dt> + <dd>indicates EOF</dd> +<dt><i>n</i></dt> + <dd>indicates actual number of bytes read. <tt>ov_read()</tt> will + decode at most one vorbis packet per invocation, so the value + returned will generally be less than <tt>length</tt>. +</dl> +</blockquote> + +<h3>Notes</h3> +<p><b>Typical usage:</b> +<blockquote> +<tt>bytes_read = ov_read_filter(&vf, +buffer, 4096,0,2,1,&current_section, filter, (void *)filter_data_ptr)</tt> +</blockquote> + +This reads up to 4096 bytes into a buffer, with signed 16-bit +little-endian samples. The decoded data is passed to the function <tt>filter</tt> before integer conversiona nd interleave. +</p> + + + +<br><br> +<hr noshade> +<table border=0 width=100%> +<tr valign=top> +<td><p class=tiny>copyright © 2000-2010 Xiph.Org</p></td> +<td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/">Ogg Vorbis</a></p></td> +</tr><tr> +<td><p class=tiny>Vorbisfile documentation</p></td> +<td align=right><p class=tiny>vorbisfile version 1.3.2 - 20101101</p></td> +</tr> +</table> + +</body> + +</html> |