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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Audio Streams</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="wrappers.ssh2.html">Secure Shell 2</a></div> <div class="next" style="text-align: right; float: right;"><a href="wrappers.expect.html">Process Interaction Streams</a></div> <div class="up"><a href="wrappers.html">List of Supported Protocols/Wrappers</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="wrappers.audio" class="section"> <h2 class="title">Audio Streams</h2> <p class="simpara"><var class="filename">ogg://</var> PHP 4.3.0 and up (PECL) </p> <ul class="itemizedlist"> <li class="listitem"><span class="simpara"><var class="filename">ogg://soundfile.ogg</var></span></li> <li class="listitem"><span class="simpara"><var class="filename">ogg:///path/to/soundfile.ogg</var></span></li> <li class="listitem"><span class="simpara"><var class="filename">ogg://http://www.example.com/path/to/soundstream.ogg</var></span></li> </ul> <blockquote><p><b class="note">Note</b>: <b>This wrapper is not enabled by default</b><br /> <span class="simpara"> In order to use the <var class="filename">ogg://</var> wrapper you must install the <a href="http://pecl.php.net/package/oggvorbis" class="link external">» OGG/Vorbis</a> extension available from <a href="http://pecl.php.net/" class="link external">» PECL</a>. </span> </p></blockquote> <p class="simpara"> Files opened for reading via the <var class="filename">ogg://</var> wrapper are treated as compressed audio encoded using the OGG/Vorbis codec. Similarly, files opened for writing or appending via the <var class="filename">ogg://</var> wrapper are writen as compressed audio data. <a href="function.stream-get-meta-data.html" class="function">stream_get_meta_data()</a>, when used on an OGG/Vorbis file opened for reading will return various details about the stream including the <i><tt class="parameter">vendor</tt></i> tag, any included <i><tt class="parameter">comments</tt></i>, the number of <i><tt class="parameter">channels</tt></i>, the sampling <i><tt class="parameter">rate</tt></i>, and the encoding rate range described by: <i><tt class="parameter">bitrate_lower</tt></i>, <i><tt class="parameter">bitrate_upper</tt></i>, <i><tt class="parameter">bitrate_nominal</tt></i>, and <i><tt class="parameter">bitrate_window</tt></i>. </p> <p class="para"> <table border="5"> <caption><b>Wrapper Summary</b></caption> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Attribute</th> <th colspan="1">Supported</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Restricted by <a href="filesystem.configuration.html#ini.allow-url-fopen" class="link">allow_url_fopen</a></td> <td colspan="1" rowspan="1" align="left">No</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Allows Reading</td> <td colspan="1" rowspan="1" align="left">Yes</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Allows Writing</td> <td colspan="1" rowspan="1" align="left">Yes</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Allows Appending</td> <td colspan="1" rowspan="1" align="left">Yes</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Allows Simultaneous Reading and Writing</td> <td colspan="1" rowspan="1" align="left">No</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Supports <a href="function.stat.html" class="function">stat()</a></td> <td colspan="1" rowspan="1" align="left">No</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Supports <a href="function.unlink.html" class="function">unlink()</a></td> <td colspan="1" rowspan="1" align="left">No</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Supports <a href="function.rename.html" class="function">rename()</a></td> <td colspan="1" rowspan="1" align="left">No</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Supports <a href="function.mkdir.html" class="function">mkdir()</a></td> <td colspan="1" rowspan="1" align="left">No</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">Supports <a href="function.rmdir.html" class="function">rmdir()</a></td> <td colspan="1" rowspan="1" align="left">No</td> </tr> </tbody> </colgroup> </table> </p> <p class="para"> <table border="5"> <caption><b>Context options</b></caption> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Name</th> <th colspan="1">Usage</th> <th colspan="1">Default</th> <th colspan="1">Mode</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>pcm_mode</i></td> <td colspan="1" rowspan="1" align="left"> PCM encoding to apply while reading, one of: <b><tt>OGGVORBIS_PCM_U8</tt></b>, <b><tt>OGGVORBIS_PCM_S8</tt></b>, <b><tt>OGGVORBIS_PCM_U16_BE</tt></b>, <b><tt>OGGVORBIS_PCM_S16_BE</tt></b>, <b><tt>OGGVORBIS_PCM_U16_LE</tt></b>, and <b><tt>OGGVORBIS_PCM_S16_LE</tt></b>. (8 vs 16 bit, signed or unsigned, big or little endian) </td> <td colspan="1" rowspan="1" align="left">OGGVORBIS_PCM_S16_LE</td> <td colspan="1" rowspan="1" align="left">Read</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>rate</i></td> <td colspan="1" rowspan="1" align="left"> Sampling rate of input data, expressed in Hz </td> <td colspan="1" rowspan="1" align="left">44100</td> <td colspan="1" rowspan="1" align="left">Write/Append</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>bitrate</i></td> <td colspan="1" rowspan="1" align="left"> When given as an integer, the fixed bitrate at which to encode. (16000 to 131072) When given as a float, the variable bitrate quality to use. (-1.0 to 1.0) </td> <td colspan="1" rowspan="1" align="left">128000</td> <td colspan="1" rowspan="1" align="left">Write/Append</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>channels</i></td> <td colspan="1" rowspan="1" align="left"> The number of audio channels to encode, typically 1 (Mono), or 2 (Stero). May range as high as 16. </td> <td colspan="1" rowspan="1" align="left">2</td> <td colspan="1" rowspan="1" align="left">Write/Append</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>comments</i></td> <td colspan="1" rowspan="1" align="left"> An array of string values to encode into the track header. </td> <td class="empty"> </td> <td colspan="1" rowspan="1" align="left">Write/Append</td> </tr> </tbody> </colgroup> </table> </p> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="wrappers.ssh2.html">Secure Shell 2</a></div> <div class="next" style="text-align: right; float: right;"><a href="wrappers.expect.html">Process Interaction Streams</a></div> <div class="up"><a href="wrappers.html">List of Supported Protocols/Wrappers</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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