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>Usage</H1
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> (no version information, might be only in CVS)</P
>Usage --
Examples on using the ogg:// wrapper.
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>范例</H2
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><B
>例 1. Reading an OGG/Vorbis file</B
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><code><font color="#000000">
<font color="#0000BB"><?php<br />dl</font><font color="#007700">(</font><font color="#DD0000">"oggvorbis.so"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* By default, ogg:// will decode to Signed 16-bit Little Endian */<br /></font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">'ogg://myaudio.ogg'</font><font color="#007700">, </font><font color="#DD0000">'r'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Collect some information about the file. */<br /></font><font color="#0000BB">$metadata </font><font color="#007700">= </font><font color="#0000BB">stream_get_meta_data</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Inspect the first song (usually the only song, <br /> but OGG/Vorbis files may be chained) */<br /></font><font color="#0000BB">$songdata </font><font color="#007700">= </font><font color="#0000BB">$metadata</font><font color="#007700">[</font><font color="#DD0000">'wrapper_data'</font><font color="#007700">][</font><font color="#0000BB">0</font><font color="#007700">];<br /><br />echo </font><font color="#DD0000">"OGG/Vorbis file encoded by: </font><font color="#007700">{</font><font color="#DD0000">$songdata</font><font color="#007700">[</font><font color="#DD0000">'vendor'</font><font color="#007700">]}\n</font><font color="#DD0000">."</font><font color="#007700">;<br />echo </font><font color="#DD0000">" </font><font color="#007700">{</font><font color="#DD0000">$songdata</font><font color="#007700">[</font><font color="#DD0000">'channels'</font><font color="#007700">]}</font><font color="#DD0000"> channels of </font><font color="#007700">{</font><font color="#DD0000">$songdata</font><font color="#007700">[</font><font color="#DD0000">'rate'</font><font color="#007700">]}</font><font color="#DD0000">Hz sampling encoded at </font><font color="#007700">{</font><font color="#DD0000">$songdata</font><font color="#007700">[</font><font color="#DD0000">'bitrate_nominal'</font><font color="#007700">]}</font><font color="#DD0000">bps.</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br />foreach(</font><font color="#0000BB">$songdata</font><font color="#007700">[</font><font color="#DD0000">'comments'</font><font color="#007700">] as </font><font color="#0000BB">$comment</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">" $comment</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br />}<br /><br />while (</font><font color="#0000BB">$audio_data </font><font color="#007700">= </font><font color="#0000BB">fread</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#0000BB">8192</font><font color="#007700">)) {<br /> </font><font color="#FF8000">/* Do something with the PCM audio we're extracting from the OGG.<br /> Copying to /dev/dsp is a good target on linux systems, <br /> just remember to setup the device for your sampling mode first. */<br /></font><font color="#007700">}<br /><br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?></font>
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><B
>例 2. Encode an audio file to OGG/Vorbis</B
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><code><font color="#000000">
<font color="#0000BB"><?php<br />dl</font><font color="#007700">(</font><font color="#DD0000">'oggvorbis.so'</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$context </font><font color="#007700">= </font><font color="#0000BB">stream_context_create</font><font color="#007700">(array(</font><font color="#DD0000">'ogg'</font><font color="#007700">=>array(<br /> </font><font color="#DD0000">'pcm_mode' </font><font color="#007700">=> </font><font color="#0000BB">OGGVORBIS_PCM_S8</font><font color="#007700">, </font><font color="#FF8000">/* Signed 8bit audio */<br /> </font><font color="#DD0000">'rate' </font><font color="#007700">=> </font><font color="#0000BB">44100</font><font color="#007700">, </font><font color="#FF8000">/* 44kHz CD quality */<br /> </font><font color="#DD0000">'bitrate' </font><font color="#007700">=> </font><font color="#0000BB">0.5</font><font color="#007700">, </font><font color="#FF8000">/* Midquality VBR */<br /> </font><font color="#DD0000">'channels' </font><font color="#007700">=> </font><font color="#0000BB">1</font><font color="#007700">, </font><font color="#FF8000">/* Mono */<br /> </font><font color="#DD0000">'serialno' </font><font color="#007700">=> </font><font color="#0000BB">12345</font><font color="#007700">))); </font><font color="#FF8000">/* Unique within our stream */<br /><br />/* Open file for appending. This will "chain" a second OGG stream at the end of the first. */<br /></font><font color="#0000BB">$ogg </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">'ogg://mysong.ogg'</font><font color="#007700">, </font><font color="#DD0000">'a'</font><font color="#007700">, </font><font color="#0000BB">false</font><font color="#007700">, </font><font color="#0000BB">$context</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$pcm </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">'mysample.pcm'</font><font color="#007700">, </font><font color="#DD0000">'r'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Compress the raw PCM audio from mysample.pcm into mysong.ogg */<br /></font><font color="#0000BB">stream_copy_to_stream</font><font color="#007700">(</font><font color="#0000BB">$pcm</font><font color="#007700">, </font><font color="#0000BB">$ogg</font><font color="#007700">);<br /><br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$pcm</font><font color="#007700">);<br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$ogg</font><font color="#007700">);<br /></font><font color="#0000BB">?></font>
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