EVOLUTION-MANAGER
Edit File: decoding.html
<html> <head> <title>libogg - Decoding</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>libogg documentation</p></td> <td align=right><p class=tiny>libogg release 1.3.0 - 20110804</p></td> </tr> </table> <h1>Decoding</h1> <p>Libogg contains a set of functions used in the decoding process. <p> All the <b>libogg</b> specific functions are declared in "ogg/ogg.h". <p> <p>Decoding is based around the ogg synchronization layer. The <a href="ogg_sync_state.html">ogg_sync_state</a> struct coordinates between incoming data and the decoder. We read data into the synchronization layer, submit the data to the stream, and output raw packets to the decoder. <p>Decoding through the Ogg layer follows a specific logical sequence. A read loop follows these logical steps: <ul> <li>Expose a buffer using <a href="ogg_sync_buffer.html">ogg_sync_buffer()</a>. <li>Read data into the buffer, using fread() or a similar function. <li>Call <a href="ogg_sync_wrote.html">ogg_sync_wrote()</a> to tell the synchronization layer how many bytes you wrote into the buffer. <li>Write out the data using <a href="ogg_sync_pageout.html">ogg_sync_pageout</a>. <li>Submit the completed page to the streaming layer with <a href="ogg_stream_pagein.html">ogg_stream_pagein</a>. <li>Output a packet of data to the codec-specific decoding layer using <a href="ogg_stream_packetout.html">ogg_stream_packetout</a>. </ul> <p>In practice, streams are more complex, and Ogg also must handle headers, incomplete or dropped pages, and other errors in input. <br><br> <table border=1 color=black width=50% cellspacing=0 cellpadding=7> <tr bgcolor=#cccccc> <td><b>function</b></td> <td><b>purpose</b></td> </tr> <tr valign=top> <td><a href="ogg_sync_init.html">ogg_sync_init</a></td> <td>Initializes an Ogg bitstream.</td> </tr> <tr valign=top> <td><a href="ogg_sync_clear.html">ogg_sync_clear</a></td> <td>Clears the status information from the synchronization struct.<td> </tr> <tr valign=top> <td><a href="ogg_sync_reset.html">ogg_sync_reset</a></td> <td>Resets the synchronization status to initial values.</td> </tr> <tr valign=top> <td><a href="ogg_sync_destroy.html">ogg_sync_destroy</a></td> <td>Frees the synchronization struct.</td> </tr> <tr valign=top> <td><a href="ogg_sync_check.html">ogg_sync_check</a></td> <td>Check for asynchronous errors.</td> </tr> <tr valign=top> <td><a href="ogg_sync_buffer.html">ogg_sync_buffer</a></td> <td>Exposes a buffer from the synchronization layer in order to read data.</td> </tr> <tr valign=top> <td><a href="ogg_sync_wrote.html">ogg_sync_wrote</a></td> <td>Tells the synchronization layer how many bytes were written into the buffer.</td> </tr> <tr valign=top> <td><a href="ogg_sync_pageseek.html">ogg_sync_pageseek</a></td> <td>Finds the borders of pages and resynchronizes the stream.</td> </tr> <tr valign=top> <td><a href="ogg_sync_pageout.html">ogg_sync_pageout</a></td> <td>Outputs a page from the synchronization layer.</td> </tr> <tr valign=top> <td><a href="ogg_stream_pagein.html">ogg_stream_pagein</a></td> <td>Submits a complete page to the stream layer.</td> </tr> <tr valign=top> <td><a href="ogg_stream_packetout.html">ogg_stream_packetout</a></td> <td>Outputs a packet to the codec-specific decoding engine.</td> </tr> <tr valign=top> <td><a href="ogg_stream_packetpeek.html">ogg_stream_packetpeek</a></td> <td>Provides access to the next packet in the bitstream without advancing decoding.</td> </tr> </table> <br><br> <hr noshade> <table border=0 width=100%> <tr valign=top> <td><p class=tiny>copyright © 2000-2011 Xiph.Org</p></td> <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/">Ogg Container Format</a></p></td> </tr><tr> <td><p class=tiny>libogg documentation</p></td> <td align=right><p class=tiny>libogg release 1.3.0 - 20110804</p></td> </tr> </table> </body> </html>