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libsdl2_mixer/external/libvorbis-1.3.5/doc/programming.html
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libsdl2_mixer/external/libvorbis-1.3.5/doc/programming.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html>
|
||||
<head>
|
||||
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-15"/>
|
||||
<title>Ogg Vorbis Documentation</title>
|
||||
|
||||
<style type="text/css">
|
||||
body {
|
||||
margin: 0 18px 0 18px;
|
||||
padding-bottom: 30px;
|
||||
font-family: Verdana, Arial, Helvetica, sans-serif;
|
||||
color: #333333;
|
||||
font-size: .8em;
|
||||
}
|
||||
|
||||
a {
|
||||
color: #3366cc;
|
||||
}
|
||||
|
||||
img {
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||||
border: 0;
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||||
}
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|
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#xiphlogo {
|
||||
margin: 30px 0 16px 0;
|
||||
}
|
||||
|
||||
#content p {
|
||||
line-height: 1.4;
|
||||
}
|
||||
|
||||
h1, h1 a, h2, h2 a, h3, h3 a {
|
||||
font-weight: bold;
|
||||
color: #ff9900;
|
||||
margin: 1.3em 0 8px 0;
|
||||
}
|
||||
|
||||
h1 {
|
||||
font-size: 1.3em;
|
||||
}
|
||||
|
||||
h2 {
|
||||
font-size: 1.2em;
|
||||
}
|
||||
|
||||
h3 {
|
||||
font-size: 1.1em;
|
||||
}
|
||||
|
||||
li {
|
||||
line-height: 1.4;
|
||||
}
|
||||
|
||||
#copyright {
|
||||
margin-top: 30px;
|
||||
line-height: 1.5em;
|
||||
text-align: center;
|
||||
font-size: .8em;
|
||||
color: #888888;
|
||||
clear: both;
|
||||
}
|
||||
</style>
|
||||
|
||||
</head>
|
||||
|
||||
<body>
|
||||
|
||||
<div id="xiphlogo">
|
||||
<a href="http://www.xiph.org/"><img src="fish_xiph_org.png" alt="Fish Logo and Xiph.Org"/></a>
|
||||
</div>
|
||||
|
||||
<h1>Programming with Xiph.Org <tt>libvorbis</tt></h1>
|
||||
|
||||
<h2>Description</h2>
|
||||
|
||||
<p>Libvorbis is the Xiph.Org Foundation's portable Ogg Vorbis CODEC
|
||||
implemented as a programmatic library. Libvorbis provides primitives
|
||||
to handle framing and manipulation of Ogg bitstreams (used by the
|
||||
Vorbis for streaming), a full analysis (encoding) interface as well as
|
||||
packet decoding and synthesis for playback.</p>
|
||||
|
||||
<p>The libvorbis library does not provide any system interface; a
|
||||
full-featured demonstration player included with the library
|
||||
distribtion provides example code for a variety of system interfaces
|
||||
as well as a working example of using libvorbis in production code.</p>
|
||||
|
||||
<h2>Encoding Overview</h2>
|
||||
|
||||
<h2>Decoding Overview</h2>
|
||||
|
||||
<p>Decoding a bitstream with libvorbis follows roughly the following
|
||||
steps:</p>
|
||||
|
||||
<ol>
|
||||
<li>Frame the incoming bitstream into pages</li>
|
||||
<li>Sort the pages by logical bitstream and buffer then into logical streams</li>
|
||||
<li>Decompose the logical streams into raw packets</li>
|
||||
<li>Reconstruct segments of the original data from each packet</li>
|
||||
<li>Glue the reconstructed segments back into a decoded stream</li>
|
||||
</ol>
|
||||
|
||||
<h3>Framing</h3>
|
||||
|
||||
<p>An Ogg bitstream is logically arranged into pages, but to decode
|
||||
the pages, we have to find them first. The raw bitstream is first fed
|
||||
into an <tt>ogg_sync_state</tt> buffer using <tt>ogg_sync_buffer()</tt>
|
||||
and <tt>ogg_sync_wrote()</tt>. After each block we submit to the sync
|
||||
buffer, we should check to see if we can frame and extract a complete
|
||||
page or pages using <tt>ogg_sync_pageout()</tt>. Extra pages are
|
||||
buffered; allowing them to build up in the <tt>ogg_sync_state</tt>
|
||||
buffer will eventually exhaust memory.</p>
|
||||
|
||||
<p>The Ogg pages returned from <tt>ogg_sync_pageout</tt> need not be
|
||||
decoded further to be used as landmarks in seeking; seeking can be
|
||||
either a rough process of simply jumping to approximately intuited
|
||||
portions of the bitstream, or it can be a precise bisection process
|
||||
that captures pages and inspects data position. When seeking,
|
||||
however, sequential multiplexing (chaining) must be accounted for;
|
||||
beginning play in a new logical bitstream requires initializing a
|
||||
synthesis engine with the headers from that bitstream. Vorbis
|
||||
bitstreams do not make use of concurent multiplexing (grouping).</p>
|
||||
|
||||
<h3>Sorting</h3>
|
||||
|
||||
<p>The pages produced by <tt>ogg_sync_pageout</tt> are then sorted by
|
||||
serial number to seperate logical bitstreams. Initialize logical
|
||||
bitstream buffers (<tt>og_stream_state</tt>) using
|
||||
<tt>ogg_stream_init()</tt>. Pages are submitted to the matching
|
||||
logical bitstream buffer using <tt>ogg_stream_pagein</tt>; the serial
|
||||
number of the page and the stream buffer must match, or the page will
|
||||
be rejected. A page submitted out of sequence will simply be noted,
|
||||
and in the course of outputting packets, the hole will be flagged
|
||||
(<tt>ogg_sync_pageout</tt> and <tt>ogg_stream_packetout</tt> will
|
||||
return a negative value at positions where they had to recapture the
|
||||
stream).</p>
|
||||
|
||||
<h3>Extracting packets</h3>
|
||||
|
||||
<p>After submitting page[s] to a logical stream, read available packets
|
||||
using <tt>ogg_stream_packetout</tt>.</p>
|
||||
|
||||
<h3>Decoding packets</h3>
|
||||
|
||||
<h3>Reassembling data segments</h3>
|
||||
|
||||
<h2>Ogg Bitstream Manipulation Structures</h2>
|
||||
|
||||
<p>Two of the Ogg bitstream data structures are intended to be
|
||||
transparent to the developer; the fields should be used directly.</p>
|
||||
|
||||
<h3>ogg_packet</h3>
|
||||
|
||||
<pre>
|
||||
typedef struct {
|
||||
unsigned char *packet;
|
||||
long bytes;
|
||||
long b_o_s;
|
||||
long e_o_s;
|
||||
|
||||
size64 granulepos;
|
||||
|
||||
} ogg_packet;
|
||||
</pre>
|
||||
|
||||
<dl>
|
||||
<dt>packet:</dt>
|
||||
<dd>a pointer to the byte data of the raw packet</dd>
|
||||
<dt>bytes:</dt>
|
||||
<dd>the size of the packet' raw data</dd>
|
||||
<dt>b_o_s:</dt>
|
||||
<dd>beginning of stream; nonzero if this is the first packet of
|
||||
the logical bitstream</dd>
|
||||
<dt>e_o_s:</dt>
|
||||
<dd>end of stream; nonzero if this is the last packet of the
|
||||
logical bitstream</dd>
|
||||
<dt>granulepos:</dt>
|
||||
<dd>the absolute position of this packet in the original
|
||||
uncompressed data stream.</dd>
|
||||
</dl>
|
||||
|
||||
<h4>encoding notes</h4>
|
||||
|
||||
<p>The encoder is responsible for setting all of
|
||||
the fields of the packet to appropriate values before submission to
|
||||
<tt>ogg_stream_packetin()</tt>; however, it is noted that the value in
|
||||
<tt>b_o_s</tt> is ignored; the first page produced from a given
|
||||
<tt>ogg_stream_state</tt> structure will be stamped as the initial
|
||||
page. <tt>e_o_s</tt>, however, must be set; this is the means by
|
||||
which the stream encoding primitives handle end of stream and cleanup.</p>
|
||||
|
||||
<h4>decoding notes</h4>
|
||||
|
||||
<p><tt>ogg_stream_packetout()</tt> sets the fields
|
||||
to appropriate values. Note that granulepos will be >= 0 only in the
|
||||
case that the given packet actually represents that position (ie, only
|
||||
the last packet completed on any page will have a meaningful
|
||||
<tt>granulepos</tt>). Intervening frames will see <tt>granulepos</tt> set
|
||||
to -1.</p>
|
||||
|
||||
<h3>ogg_page</h3>
|
||||
|
||||
<pre>
|
||||
typedef struct {
|
||||
unsigned char *header;
|
||||
long header_len;
|
||||
unsigned char *body;
|
||||
long body_len;
|
||||
} ogg_page;
|
||||
</pre>
|
||||
|
||||
<dl>
|
||||
<dt>header:</dt>
|
||||
<dd>pointer to the page header data</dd>
|
||||
<dt>header_len:</dt>
|
||||
<dd>length of the page header in bytes</dd>
|
||||
<dt>body:</dt>
|
||||
<dd>pointer to the page body</dd>
|
||||
<dt>body_len:</dt>
|
||||
<dd>length of the page body</dd>
|
||||
</dl>
|
||||
|
||||
<p>Note that although the <tt>header</tt> and <tt>body</tt> pointers do
|
||||
not necessarily point into a single contiguous page vector, the page
|
||||
body must immediately follow the header in the bitstream.</p>
|
||||
|
||||
<h2>Ogg Bitstream Manipulation Functions</h2>
|
||||
|
||||
<h3>
|
||||
int ogg_page_bos(ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Returns the 'beginning of stream' flag for the given Ogg page. The
|
||||
beginning of stream flag is set on the initial page of a logical
|
||||
bitstream.</p>
|
||||
|
||||
<p>Zero indicates the flag is cleared (this is not the initial page of a
|
||||
logical bitstream). Nonzero indicates the flag is set (this is the
|
||||
initial page of a logical bitstream).</p>
|
||||
|
||||
<h3>
|
||||
int ogg_page_continued(ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Returns the 'packet continued' flag for the given Ogg page. The packet
|
||||
continued flag indicates whether or not the body data of this page
|
||||
begins with packet continued from a preceeding page.</p>
|
||||
|
||||
<p>Zero (unset) indicates that the body data begins with a new packet.
|
||||
Nonzero (set) indicates that the first packet data on the page is a
|
||||
continuation from the preceeding page.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_page_eos(ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Returns the 'end of stream' flag for a give Ogg page. The end of page
|
||||
flag is set on the last (terminal) page of a logical bitstream.</p>
|
||||
|
||||
<p>Zero (unset) indicates that this is not the last page of a logical
|
||||
bitstream. Nonzero (set) indicates that this is the last page of a
|
||||
logical bitstream and that no addiitonal pages belonging to this
|
||||
bitstream may follow.</p>
|
||||
|
||||
<h3>
|
||||
size64 ogg_page_granulepos(ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Returns the position of this page as an absolute position within the
|
||||
original uncompressed data. The position, as returned, is 'frames
|
||||
encoded to date up to and including the last whole packet on this
|
||||
page'. Partial packets begun on this page but continued to the
|
||||
following page are not included. If no packet ends on this page, the
|
||||
frame position value will be equal to the frame position value of the
|
||||
preceeding page. If none of the original uncompressed data is yet
|
||||
represented in the logical bitstream (for example, the first page of a
|
||||
bitstream consists only of a header packet; this packet encodes only
|
||||
metadata), the value shall be zero.</p>
|
||||
|
||||
<p>The units of the framenumber are determined by media mapping. A
|
||||
vorbis audio bitstream, for example, defines one frame to be the
|
||||
channel values from a single sampling period (eg, a 16 bit stereo
|
||||
bitstream consists of two samples of two bytes for a total of four
|
||||
bytes, thus a frame would be four bytes). A video stream defines one
|
||||
frame to be a single frame of video.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_page_pageno(ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Returns the sequential page number of the given Ogg page. The first
|
||||
page in a logical bitstream is numbered zero; following pages are
|
||||
numbered in increasing monotonic order.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_page_serialno(ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Returns the serial number of the given Ogg page. The serial number is
|
||||
used as a handle to distinguish various logical bitstreams in a
|
||||
physical Ogg bitstresm. Every logical bitstream within a
|
||||
physical bitstream must use a unique (within the scope of the physical
|
||||
bitstream) serial number, which is stamped on all bitstream pages.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_page_version(ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Returns the revision of the Ogg bitstream structure of the given page.
|
||||
Currently, the only permitted number is zero. Later revisions of the
|
||||
bitstream spec will increment this version should any changes be
|
||||
incompatable.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_stream_clear(ogg_stream_state *os);
|
||||
</h3>
|
||||
|
||||
<p>Clears and deallocates the internal storage of the given Ogg stream.
|
||||
After clearing, the stream structure is not initialized for use;
|
||||
<tt>ogg_stream_init</tt> must be called to reinitialize for use.
|
||||
Use <tt>ogg_stream_reset</tt> to reset the stream state
|
||||
to a fresh, intiialized state.</p>
|
||||
|
||||
<p><tt>ogg_stream_clear</tt> does not call <tt>free()</tt> on the pointer
|
||||
<tt>os</tt>, allowing use of this call on stream structures in static
|
||||
or automatic storage. <tt>ogg_stream_destroy</tt>is a complimentary
|
||||
function that frees the pointer as well.</p>
|
||||
|
||||
<p>Returns zero on success and non-zero on failure. This function always
|
||||
succeeds.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_stream_destroy(ogg_stream_state *os);
|
||||
</h3>
|
||||
|
||||
<p>Clears and deallocates the internal storage of the given Ogg stream,
|
||||
then frees the storage associated with the pointer <tt>os</tt>.</p>
|
||||
|
||||
<p><tt>ogg_stream_clear</tt> does not call <tt>free()</tt> on the pointer
|
||||
<tt>os</tt>, allowing use of that call on stream structures in static
|
||||
or automatic storage.</p>
|
||||
|
||||
<p>Returns zero on success and non-zero on failure. This function always
|
||||
succeeds.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_stream_init(ogg_stream_state *os,int serialno);
|
||||
</h3>
|
||||
|
||||
<p>Initialize the storage associated with <tt>os</tt> for use as an Ogg
|
||||
stream. This call is used to initialize a stream for both encode and
|
||||
decode. The given serial number is the serial number that will be
|
||||
stamped on pages of the produced bitstream (during encode), or used as
|
||||
a check that pages match (during decode).</p>
|
||||
|
||||
<p>Returns zero on success, nonzero on failure.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_stream_packetin(ogg_stream_state *os, ogg_packet *op);
|
||||
</h3>
|
||||
|
||||
<p>Used during encoding to add the given raw packet to the given Ogg
|
||||
bitstream. The contents of <tt>op</tt> are copied;
|
||||
<tt>ogg_stream_packetin</tt> does not retain any pointers into
|
||||
<tt>op</tt>'s storage. The encoding proccess buffers incoming packets
|
||||
until enough packets have been assembled to form an entire page;
|
||||
<tt>ogg_stream_pageout</tt> is used to read complete pages.</p>
|
||||
|
||||
<p>Returns zero on success, nonzero on failure.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_stream_packetout(ogg_stream_state *os,ogg_packet *op);
|
||||
</h3>
|
||||
|
||||
<p>Used during decoding to read raw packets from the given logical
|
||||
bitstream. <tt>ogg_stream_packetout</tt> will only return complete
|
||||
packets for which checksumming indicates no corruption. The size and
|
||||
contents of the packet exactly match those given in the encoding
|
||||
process. </p>
|
||||
|
||||
<p>Returns zero if the next packet is not ready to be read (not buffered
|
||||
or incomplete), positive if it returned a complete packet in
|
||||
<tt>op</tt> and negative if there is a gap, extra bytes or corruption
|
||||
at this position in the bitstream (essentially that the bitstream had
|
||||
to be recaptured). A negative value is not necessarily an error. It
|
||||
would be a common occurence when seeking, for example, which requires
|
||||
recapture of the bitstream at the position decoding continued.</p>
|
||||
|
||||
<p>If the return value is positive, <tt>ogg_stream_packetout</tt> placed
|
||||
a packet in <tt>op</tt>. The data in <tt>op</tt> points to static
|
||||
storage that is valid until the next call to
|
||||
<tt>ogg_stream_pagein</tt>, <tt>ogg_stream_clear</tt>,
|
||||
<tt>ogg_stream_reset</tt>, or <tt>ogg_stream_destroy</tt>. The
|
||||
pointers are not invalidated by more calls to
|
||||
<tt>ogg_stream_packetout</tt>.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_stream_pagein(ogg_stream_state *os, ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Used during decoding to buffer the given complete, pre-verified page
|
||||
for decoding into raw Ogg packets. The given page must be framed,
|
||||
normally produced by <tt>ogg_sync_pageout</tt>, and from the logical
|
||||
bitstream associated with <tt>os</tt> (the serial numbers must match).
|
||||
The contents of the given page are copied; <tt>ogg_stream_pagein</tt>
|
||||
retains no pointers into <tt>og</tt> storage.</p>
|
||||
|
||||
<p>Returns zero on success and non-zero on failure.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_stream_pageout(ogg_stream_state *os, ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Used during encode to read complete pages from the stream buffer. The
|
||||
returned page is ready for sending out to the real world.</p>
|
||||
|
||||
<p>Returns zero if there is no complete page ready for reading. Returns
|
||||
nonzero when it has placed data for a complete page into
|
||||
<tt>og</tt>. Note that the storage returned in og points into internal
|
||||
storage; the pointers in <tt>og</tt> are valid until the next call to
|
||||
<tt>ogg_stream_pageout</tt>, <tt>ogg_stream_packetin</tt>,
|
||||
<tt>ogg_stream_reset</tt>, <tt>ogg_stream_clear</tt> or
|
||||
<tt>ogg_stream_destroy</tt>.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_stream_reset(ogg_stream_state *os);
|
||||
</h3>
|
||||
|
||||
<p>Resets the given stream's state to that of a blank, unused stream;
|
||||
this may be used during encode or decode.</p>
|
||||
|
||||
<p>Note that if used during encode, it does not alter the stream's serial
|
||||
number. In addition, the next page produced during encoding will be
|
||||
marked as the 'initial' page of the logical bitstream.</p>
|
||||
|
||||
<p>When used during decode, this simply clears the data buffer of any
|
||||
pending pages. Beginning and end of stream cues are read from the
|
||||
bitstream and are unaffected by reset.</p>
|
||||
|
||||
<p>Returns zero on success and non-zero on failure. This function always
|
||||
succeeds.</p>
|
||||
|
||||
<h3>
|
||||
char *ogg_sync_buffer(ogg_sync_state *oy, long size);
|
||||
</h3>
|
||||
|
||||
<p>This call is used to buffer a raw bitstream for framing and
|
||||
verification. <tt>ogg_sync_buffer</tt> handles stream capture and
|
||||
recapture, checksumming, and division into Ogg pages (as required by
|
||||
<tt>ogg_stream_pagein</tt>).</p>
|
||||
|
||||
<p><tt>ogg_sync_buffer</tt> exposes a buffer area into which the decoder
|
||||
copies the next (up to) <tt>size</tt> bytes. We expose the buffer
|
||||
(rather than taking a buffer) in order to avoid an extra copy many
|
||||
uses; this way, for example, <tt>read()</tt> can transfer data
|
||||
directly into the stream buffer without first needing to place it in
|
||||
temporary storage.</p>
|
||||
|
||||
<p>Returns a pointer into <tt>oy</tt>'s internal bitstream sync buffer;
|
||||
the remaining space in the sync buffer is at least <tt>size</tt>
|
||||
bytes. The decoder need not write all of <tt>size</tt> bytes;
|
||||
<tt>ogg_sync_wrote</tt> is used to inform the engine how many bytes
|
||||
were actually written. Use of <tt>ogg_sync_wrote</tt> after writing
|
||||
into the exposed buffer is mandantory.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_sync_clear(ogg_sync_state *oy);
|
||||
</h3>
|
||||
|
||||
<p><tt>ogg_sync_clear</tt>
|
||||
clears and deallocates the internal storage of the given Ogg sync
|
||||
buffer. After clearing, the sync structure is not initialized for
|
||||
use; <tt>ogg_sync_init</tt> must be called to reinitialize for use.
|
||||
Use <tt>ogg_sync_reset</tt> to reset the sync state and buffer to a
|
||||
fresh, intiialized state.</p>
|
||||
|
||||
<p><tt>ogg_sync_clear</tt> does not call <tt>free()</tt> on the pointer
|
||||
<tt>oy</tt>, allowing use of this call on sync structures in static
|
||||
or automatic storage. <tt>ogg_sync_destroy</tt>is a complimentary
|
||||
function that frees the pointer as well.</p>
|
||||
|
||||
<p>Returns zero on success and non-zero on failure. This function always
|
||||
succeeds.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_sync_destroy(ogg_sync_state *oy);
|
||||
</h3>
|
||||
|
||||
<p>Clears and deallocates the internal storage of the given Ogg sync
|
||||
buffer, then frees the storage associated with the pointer
|
||||
<tt>oy</tt>.</p>
|
||||
|
||||
<p>An alternative function,<tt>ogg_sync_clear</tt>, does not call
|
||||
<tt>free()</tt> on the pointer <tt>oy</tt>, allowing use of that call on
|
||||
stream structures in static or automatic storage.</p>
|
||||
|
||||
<p>Returns zero on success and non-zero on failure. This function always
|
||||
succeeds.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_sync_init(ogg_sync_state *oy);
|
||||
</h3>
|
||||
|
||||
<p>Initializes the sync buffer <tt>oy</tt> for use.</p>
|
||||
|
||||
<p>Returns zero on success and non-zero on failure. This function always
|
||||
succeeds.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_sync_pageout(ogg_sync_state *oy, ogg_page *og);
|
||||
</h3>
|
||||
|
||||
<p>Reads complete, framed, verified Ogg pages from the sync buffer,
|
||||
placing the page data in <tt>og</tt>.</p>
|
||||
|
||||
<p>Returns zero when there's no complete pages buffered for
|
||||
retrieval. Returns negative when a loss of sync or recapture occurred
|
||||
(this is not necessarily an error; recapture would be required after
|
||||
seeking, for example). Returns positive when a page is returned in
|
||||
<tt>og</tt>. Note that the data in <tt>og</tt> points into the sync
|
||||
buffer storage; the pointers are valid until the next call to
|
||||
<tt>ogg_sync_buffer</tt>, <tt>ogg_sync_clear</tt>,
|
||||
<tt>ogg_sync_destroy</tt> or <tt>ogg_sync_reset</tt>.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_sync_reset(ogg_sync_state *oy);
|
||||
</h3>
|
||||
|
||||
<p><tt>ogg_sync_reset</tt> resets the sync state in <tt>oy</tt> to a
|
||||
clean, empty state. This is useful, for example, when seeking to a
|
||||
new location in a bitstream.</p>
|
||||
|
||||
<p>Returns zero on success, nonzero on failure.</p>
|
||||
|
||||
<h3>
|
||||
int ogg_sync_wrote(ogg_sync_state *oy, long bytes);
|
||||
</h3>
|
||||
|
||||
<p>Used to inform the sync state as to how many bytes were actually
|
||||
written into the exposed sync buffer. It must be equal to or less
|
||||
than the size of the buffer requested.</p>
|
||||
|
||||
<p>Returns zero on success and non-zero on failure; failure occurs only
|
||||
when the number of bytes written were larger than the buffer.</p>
|
||||
|
||||
<div id="copyright">
|
||||
The Xiph Fish Logo is a
|
||||
trademark (™) of Xiph.Org.<br/>
|
||||
|
||||
These pages © 1994 - 2005 Xiph.Org. All rights reserved.
|
||||
</div>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user